ULTRA-HIGH MOLECULAR WEIGHT POLYETHYLENE AND PREPARATION METHOD THEREFOR

Abstract

The present invention relates to an ultra-high molecular weight polyethylene and a process for preparing the same, said ultra-high molecular weight polyethylene has a viscosity-average molecular weight of 150-1000×104 g/mol, a metal element content of 0-50 ppm, a bulk density of 0.30-0.55 g/cm3, a true density of 0.900-0.940 g/cm3, a melting point of 140-152° C., and a crystallinity of 40-75%, and said polyethylene satisfies at least one of condition (1) and condition (2): Condition (1): tensile elasticity modulus is greater than 250 MPa, preferably greater than 280 MPa, more preferably greater than 300 MPa,Condition (2): Young's modulus is greater than 300 MPa, preferably greater than 350 MPa.

Description

TECHNICAL FIELD

The present invention relates to an ultra-high molecular weight ethylene homopolymer and copolymer with low metal element content and high mechanical property, as well as a slurry preparation process for the ethylene homopolymer and ethylene copolymer using an alkane or a mixed alkane as the polymerization solvent and a catalyst system containing a supported non-metallocene catalyst as the main catalyst.

BACKGROUND TECHNOLOGY

Ultra-high molecular weight polyethylene (UHMWPE) generally refers to linear structured polyethylene with a relative molecular weight of 150×10⁴ g/mol or higher. It has the advantages such as excellent wear resistance, extremely high impact strength, excellent self-lubricating performance, excellent chemical and low-temperature resistance, excellent adhesion resistance, hygiene, non-toxic, and pollution-free properties, recyclability and reusability that ordinary polyethylene does not have, and therefore have been widely applied in the field such as textile, papermaking, food, chemical industry, packaging, agriculture, construction, medical treatment, water purification, sports, entertainment, and military.

In high-end applications, ultra-high molecular weight polyethylene with ultra-high viscosity-average molecular weight (viscosity-average molecular weight generally needs to be higher than 400×10⁴ g/mol) and low ash content can be used for dry or wet gel spinning to obtain high-strength ultra-high molecular weight polyethylene fibers, which are used for bullet resistant materials, cutting resistant fabrics, parachutes, fishing boxes and nets, and the like. Ultra-high molecular weight polyethylene with lower metal element content and high mechanical property can be used as medical materials such as artificial joints.

At present, in the preparation process of ultra-high molecular weight polyethylene, Ziegler-Natta catalysts are mainly used; and it is obtained by the polymerization under the slurry polymerization conditions. Patent ZL94116488.8 discloses a process for preparing an ultra-high molecular weight polyethylene with high bulk density, which is obtained by the catalytic polymerization of ethylene using a mixed catalyst containing an organic aluminum compound and a titanium component. CN200410054344.7 discloses an ultra-high molecular weight polyethylene catalyst and preparation process and application thereof. The involved catalyst is composed of a magnesium compound loaded with a titanium-containing component and a silicon-containing component. The ultra-high molecular weight polyethylene is prepared in the presence of an organic aluminum compound. CN200710042467.2 discloses an ultra-high molecular weight polyethylene catalyst and a preparation process thereof. The preparation of the main component of the catalyst is obtained by the following steps: (1) a magnesium halide reacts with an alcohol to form a magnesium compound; (2) the magnesium compound reacts with a silicon compound having at least one halogen group to form an intermediate product; and (3) the intermediate product reacts with a titanium compound to prepare the main component of the catalyst; benzoic acid ester compounds can be selectively added in each reaction step. The ultra-high molecular weight polyethylene catalyst has a high activity, and the obtained ultra-high molecular weight polyethylene has the characteristic of high bulk density.

CN200710042468.7 discloses an ultra-high molecular weight polyethylene catalyst and a preparation process thereof. The main component of the catalyst is prepared by the following steps: (1) a magnesium halide compound reacts with an alcohol compound and a titanate ester compound to form a magnesium compound solution; (2) the magnesium compound solution reacts with an alkyl aluminum chloride compound to obtain an intermediate product; (3) the intermediate product then reacts with a titanium compound, an electron donor. The ultra-high molecular weight polyethylene catalyst has high activity and the resulting ultra-high molecular weight polyethylene has the characteristic of high bulk density. U.S. Pat. No. 4,962,167A1 discloses a process for obtaining a polyethylene catalyst by reacting a reaction productof a magnesium halide compound and a titanium alkoxide with a reaction product of an aluminum halide and a silicon alkoxide. U.S. Pat. No. 5,587,440 discloses a process for preparing an ultra-high molecular weight polyethylene with a narrow particle size distribution and a high bulk density by reducing a titanium (IV) halide with an organoaluminum compound and undergoing a post-treatment, but the activity of the catalyst is relatively low.

The production processes of polyethylene mainly include a high-pressure polymerization, a gas-phase polymerization, a slurry polymerization, a solution polymerization, and other technologies and processes. Among them, the ethylene slurry polymerization process is one of the main processes for producing polyethylene. This process is divided into a loop reactor polymerization process and a stirred tank slurry polymerization process.

To obtain an ultra-high molecular weight polyethylene, the commonly used process is to polymerize ethylene in hexane or heptane solvent at a polymerization temperature and under a polymerization pressure, both of which are as low as possible. High polymerization temperature will faciliate the chain transfer, which limits the growth of polyethylene molecular chain, and it is difficult to obtain polyethylene with high viscosity-average molecular weight.

Moreover, it is known that copolymerization of ethylene and the comonomer will significantly reduce the molecular weight of the resulting polyethylene. In the existing technologies, it is even difficult to generate ultra-high molecular weight ethylene copolymers with a viscosity-average molecular weight higher than 150×10⁴ g/mol.

Patent CN201480057309.2 discloses a process for preparing a granular ultra-high molecular weight polyethylene copolymers with an organometallic compound (R³³P═N—TiCpXn) supported on a magnesium support, its catalytic activity is relatively low and the ash content in the copolymer is relatively high.

Patent CN201780000391.9 discloses an ultra-high molecular weight ethylene copolymer powder and a molded article using the ultra-high molecular weight ethylene copolymer powder. Among them, the total amount of the a-olefin unit is 0.01-0.10 mol %. However, as can be seen from the examples, the titanium element content in the copolymer is relatively high.

Patents CN201610892732.5, CN201610892836.6, CN201610892837.0, and CN201610892424.2 respectively disclose ultra-high molecular weight polyethylene, and preparation processes, and applications thereof. A supported non-metallocene catalyst is used to perform the homopolymerization of ethylene and the copolymerization of ethylene and alpha-olefin in stages. The obtained ultra-high molecular weight polyethylene molecular chain has at least two segments (homopolymerization segment A and copolymerization segment B), and is a block copolymer with a wide molecular weight distribution.

In order to obtain an ultra-high molecular weight polyethylene with low metal element content, the general approach is to select or prepare appropriate catalytic systems to achieve high polymerization activity as much as possible under ethylene polymerization conditions, which requires the catalyst to have high intrinsic polymerization activity; alternatively, under the conditions of ethylene slurry intermittent polymerization, the polymerization reaction time should be extended as much as possible to achieve a high polymerization activity, which requires the catalyst to have a long polymerization activity life, and the instantaneous consumption of its polymerization monomer ethylene should increase, remain unchanged, or slow down with time, but cannot show a rapid decrease, or even quickly decrease to an extremely low level, losing the significance of extending the reaction; alternatively, the ultra-high molecular weight polyethylene obtained after the polymerization should be subjected to a post-treatment. For example, Chinese patent 200410024103.8 discloses a post-treatment of an ultra-high molecular weight polyethylene, including filtering, solvent-washing, drying, water-washing, screening and like. However, the treatment is complex and has a requirement to the impurity content in the washing solvent, resulting in high washing and drying costs.

Chinese patent 201610747653.5 discloses a continuous water washing device and process for the ultra-high molecular weight polyethylene, which points out that during the polymerization process of the ultra-high molecular weight polyethylene, the catalyst forms an active center with alkyl aluminum, triggering the polymerization reaction of ethylene, while also producing a small amount of metallic acid. If water-washing is not carried out, during the subsequent processing of the powder, the metallic acid can cause the corrosion to processing equipment. In addition, the excessive presence of the high-boiling point alkyl aluminum during the polymerization process reacts with a small amount of oxygen and a trace amount of water in the solvent to generate aluminum hydroxide, which leads to a high content of the aluminum element in polyethylene, thereby reducing the tensile strength, the impact strength, and the wear resistance of the product.

Therefore, the current situation in this field is still to wish developing an ultra-high molecular weight polyethylene with high and controllable viscosity-average molecular weight, adjustable viscosity-average molecular weight, high bulk density and high mechanical property, low metal element content and low ash content, and high mechanical property; and a process for preparing an ultra-high molecular weight polyethylene that satisfies the following characteristics: under the ethylene slurry polymerization conditions, the catalyst has a long active life and high polymerization activity, the polymerization preparation process is flexible and adjustable, and is suitable for large-scale implementation. The produced ultra-high molecular weight polyethylene has a high bulk density, and the ethylene homopolymer has a low branching degree, the ethylene copolymers have high tensile elasticity modulus, which is beneficial for product packaging, storage, transportation, loading, and downstream processing applications.

SUMMARY OF THE INVENTION

On the basis of the existing technology, the present inventors have conducted in-depth research and found that raw materials containing ethylene and optionally at least one como-nomer are subjected to a slurry polymerization by using an alkane solvent having a boiling point of 5-55° C. or a mixed alkane solvent having a saturated vapor pressure at 20° C. of 20-150 KPa as the polymerization solvent of the ethylene slurry polymerization, using a supported non-metallocene catalyst as the main catalyst, and using one or more of aluminoxane, alkyl aluminum, and haloalkyl aluminum as the cocatalyst in the absence of hydrogen gas, which can produce an ultra-high molecular weight polyethylene with low metal element content and high mechanical property. Hence, the aforementioned existing problems can be solved and thus the present invention is completed.

That is to say, with the ultra-high molecular weight polyethylene having low metal element content and high mechanical property and its preparation process of the present invention, an ultra-high molecular weight polyethylene with low metal element content and high mechanical property can be provided without the need for harsh ethylene slurry polymerization reactor configuration and polymerization reaction conditions, as well as complex post-treatment steps. Specifically, the obtained polyethylene has mechanical properties such as high tensile elasticity modulus, high Young's modulus, high tensile yield strength, high tensile fracture strength, and high impact strength, making it very suitable for industrial scale production and for the subsequent preparation of high-strength ultra-high molecular weight polyethylene fibre, and artificial medical joints.

Specifically, the present invention provides an ultra-high molecular weight polyethylene, wherein the ultra-high molecular weight polyethylene has a viscosity-average molecular weight of 150-1000×10⁴ g/mol, preferably 200-850×10⁴ g/mol, more preferably 300-700×10⁴ g/mol, and a metal element content of 0-50 ppm, preferably 0-30 ppm, and said polyethylene satisfies at least one of condition (1) and condition (2):

• • Condition (1): tensile elasticity modulus is greater than 250 MPa, preferably greater than 280 MPa, more preferably greater than 300 MPa,
  • Condition (2): Young's modulus is greater than 300 MPa, preferably greater than 350 MPa.

More specifically, in case that said ultra-high molecular weight polyethylene is an ethylene homopolymer, the viscosity-average molecular weight is 150-1000×10⁴ g/mol, preferably 200-850×10⁴ g/mol, the titanium content is 0-3 ppm, preferably 0-2 ppm, more preferably 0-1 ppm, the calcium content is 0-5 ppm, preferably 0-3 ppm, more preferably 0-2 ppm, the magnesium content is 0-10 ppm, preferably 0-5 ppm, more preferably 0-2 ppm, the aluminum content is 0-30 ppm, preferably 0-20 ppm, more preferably 0-15 ppm, the silicon content is 0-10 ppm, preferably 0-5 ppm, more preferably 0-3 ppm, the chlorine content is 0-50 ppm, preferably 0-30 ppm, the ash content is less than 200 ppm, preferably less than 150 ppm, more preferably 80 ppm or less, the tensile yield strength is greater than 22 MPa, preferably greater than 25 MPa, the tensile strength at break is greater than 32 MPa, preferably greater than 35 MPa, the elongation at break is greater than 350%, preferably greater than 400%, the impact strength is greater than 70 KJ/m², preferably greater than 75 KJ/m², the Young's modulus is greater than 300 MPa, preferably greater than 350 MPa, more preferably greater than 400 MPa.

More specifically, in case that said ultra-high molecular weight polyethylene is an ethylene copolymer, the viscosity-average molecular weight is 150-800×10⁴ g/mol, preferably 200-700×10⁴ g/mol, the titanium content is 0-3 ppm, preferably 0-2 ppm, more preferably 0-1 ppm, the calcium content is 0-5 ppm, preferably 0-3 ppm, more preferably 0-2 ppm, the magnesium content is 0-10 ppm, preferably 0-5 ppm, more preferably 0-2 ppm, the aluminum content is 0-30 ppm, preferably 0-20 ppm, more preferably 0-15 ppm, the silicon content is 0-10 ppm, preferably 0-5 ppm, more preferably 0-3 ppm, the chlorine content is 0-50 ppm, preferably 0-30 ppm, the ash content is less than 200 ppm, preferably less than 150 ppm, more preferably 80 ppm or less, the tensile elasticity modulus is greater than 250 MPa, preferably greater than 280 MPa, more preferably greater than 300 MPa.

The present invention also provides a process for preparing an ultra-high molecular weight polyethylene, said ultra-high molecular weight polyethylene has a viscosity-average molecular weight of 150-1000×10⁴ g/mol, preferably 200-850×10⁴ g/mol, more preferably 300-700×10⁴ g/mol, wherein raw materials containing ethylene and optionally at least one como-nomer are subjected to the slurry polymerization in the absence of hydrogen gas, using a supported non-metallocene catalyst as the main catalyst, using one or more of aluminoxane, alkyl aluminum, and haloalkyl aluminum as the cocatalyst, using an alkane solvent having a boiling point of 5-55° C. or a mixed alkane solvent having a saturated vapor pressure at 20° C. of 20-150 KPa (preferably 40-110 KPa) as the polymerization solvent, to produce the ultra-high molecular weight polyethylene having a low metal element content.

Technical Effect

The ultra-high molecular weight polyethylene of the present invention has high viscosity-average molecular weight, low metal element content, low ash content, and excellent mechanical property. Specifically, the polyethylene has high tensile elasticity modulus, high tensile yield strength, high tensile strength at break, high impact strength and high Young's modulus, and high elongation at break, which is very beneficial for improving the tensile strength, the impact strength, and the wear resistance of the products made of this polyethylene.

Through the preparation process of the present invention, the used amount of the cocatalyst required for the preparation process is low, the polymerization process is stable, the real-time consumption of ethylene is stable, the activity life of the polymerization system is long, and the ethylene slurry polymerization activity is high. A polyethylene having an ultra-high viscosity average molecular weight (ethylene homopolymer or ethylene copolymer) can be obtained at a relatively higher polymerization temperature.

In addition, through the polymerization process of the present invention, an alkane solvent having a boiling point of 5-55° C. or a mixed alkane solvent having a saturated vapor pressure at 20° C. of 20-150 KPa as the polymerization solvent is used as the polymerization solvent. The selection range for the polymerization solvent is wide, and there is a wide range of options for the heat removal manner during the polymerization reaction and the post-treatment of the obtained ultra-high molecular weight polyethylene powder. Moreover, the post-treatment of the obtained ultra-high molecular weight polyethylene can be easily carried out. Moreover, when combined with the use of non-metallocene catalysts, the obtained ultra-high molecular weight polyethylene has a low residual solvent content, which is very conducive to shortening the drying time of the polyethylene material, and saving the cost of the polyethylene post-treatment, which in return facilitates the subsequent industrial application of the ethylene polymer. Moreover, polyethylene with low metal element content and low ash content as well as excellent mechanical properties can be achieved.

Moreover, in the polymerization process of the present invention, only an alkane solvent having a boiling point of 5-55° C. or a mixed alkane solvent having a saturated vapor pressure of 20-150KPa at 20° C. is used as the polymerization solvent without the need of using other solvents such as dispersants and diluents, resulting in a simplex reaction system and a simple and easy post-treatment.

DETAILED DESCRIPTION

Reference will now be made in detail to the present embodiments of the present invention, but it should be understood that the scope of the invention is not limited by the embodiments, but is defined by the appended claims.

In the context of the present invention, unless otherwise clearly defined or beyond the understanding of those skilled in the art, the hydrocarbons or hydrocarbon-derived groups having three or more carbon atoms (such as propyl, propyloxy, butyl, butane, butene, butenyl, and hexane) that are not prefixed with “n-” have the same meanings as those prefixed with “n-”. For example, propyl is generally understood as n-propyl, while butyl is generally understood as n-butyl, unless otherwise specified.

In this specification, in order to avoid complicated expressions, it is not clear whether the valence bond status of each substituent or group of the compound is monovalent, divalent, trivalent, or tetravalent, those skilled in the art can make specific judgments based on the positions or substitutions of these substituents or groups (such as groups G, D, B, A, and F recorded or defined in this specification) on the structural formulas of corresponding compounds, and choose the definition that is suitable for the valence bond status at that position or substitution situation from the definitions provided in this specification for these substituents or groups. All publications, patent applications, patents, and other references mentioned in this specification are all incorporated herein by reference. Unless defined otherwise, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.

When the specification derives a material, a substance, a process, a step, a device, an element and the like with the expression such as “known to those skilled in the art”, “prior art”, or the anologous term, it is intended that the subject matter so derived encompasses those having been conventionally used in the art at the time of filing this application, but also includes those which may not be so commonly used at the present time, but will become known in the art as being suitable for a similar purpose.

In the context of this specification, except for what is explicitly stated, any item or matter not mentioned is directly applicable to those known in the art without any changes. Moreover, any of the embodiments described herein can be freely combined with one or more other embodiments described herein, and the resulting technical solutions or technical ideas are regarded as part of the original disclosure or the original record of the present invention, and should not be regarded as new content that has not been disclosed or anticipated in this specification, unless those skilled in the art believe that the combination is obviously unreasonable.

In the absence of an explicit indication, all percentages, parts, ratios and the like mentioned in this specification are based on the weight, unless the basis on the weight is not consistent with the conventional knowledge of those skilled in the art.

Reference will now be made in detail to the present embodiments of the present invention, but it should be understood that the scope of the invention is not limited by the embodiments, but is defined by the appended claims.

In the context of the present invention, unless otherwise specified, the physical property values (such as boiling point) of the material are the values measured at normal temperature (25° C.) and normal pressure (101325 Pa).

The inventors of the present invention have conducted in-depth research and confirmed that in the polymerization process of the present invention, by using an alkane solvent having a boiling point of 5-55° C. or a mixed alkane solvent having a saturated vapor pressure at 20° C. of 20-150 KPa as the polymerization solvent, compared with the previous polymerization solvents, the specific polymerization solvent of the present invention and ethylene and optionally at least one olefin for copolymerization (e.g. propylene, 1-butene, 1-hexene, 1-octene) as the reactant have significant different boiling points, therefore the post-treatment of the obtained ultra-high molecular weight polyethylene powder may be conveniently and efficiently performed, and the residual solvent content in the obtained ultra-high molecular weight polyethylene powder is low, which is very conducive to shortening the drying time of the polyethylene powder, saving the cost of the post-treatment of the polyethylene powder. Moreover, in the present invention, only an alkane solvent having a boiling point of 5-55° C. or a mixed alkane solvent having a saturated vapor pressure at 20° C. of 20-150 KPa as the polymerization solvent is used as the polymerization solvent without the need of using other solvents such as dispersants and diluents, resulting in a simplex reaction system and a simple and easy post-treatment.

Moreover, in the present invention, the catalytic activity of the slurry polymerization system can be further improved by using a catalyst system of non-metallocene catalyst and cocatalyst in the polymerization solvent of an alkane solvent having a boiling point of 5-55° C. or a mixed alkane solvent having a saturated vapor pressure at 20° C. of 20-150 KPa (preferably 40-110 KPa), resulting in a stable polymerization process and a stable ethylene real-time consumption, and therefore a polyethylene having an ultra-high viscosity-average molecular weight can be obtained at a higher polymerization temperature. Moreover, when the slurry polymerization system of the present invention is used for copolymerization, a higher insertion rate of olefin for copolymerization can be obtained.

Therefore, the ultra-high molecular weight polyethylene obtained with the present invention shows high viscosity-average molecular weight, low metal element content, and low ash content. The obtained polyethylene has excellent mechanical property, specifically, the polyethylene has high tensile elasticity modulus, high tensile yield strength, high tensile strength at break, high impact strength and high Young's modulus, and high elongation at break. Therefore, the products obtained by using the ultra-high molecular weight polyethylene of the present invention have excellent mechanical strength and low impurity content. Therefore, the products obtained by using the ultra-high molecular weight polyethylene of the present invention are suitable for application in fields such as aerospace, medical materials, and other fields with strict quality requirements.

Through the polymerization process of the present invention, after preparing the crude product of the ultra-high molecular weight polyethylene, there is no need for complex subsequent purification processes (such as high-purity solvent washing, high-purity water washing, high-temperature digestion, and polymer melting and filtering), and nothing remains but to remove the corresponding solvent (through filtering, decanting, flash evaporation, evaporation to dryness, and the like), so that the high-purity ultra-high molecular weight polyethylene with low metal element content, low ash content, and excellent mechanical property can be obtained.

In the present invention, ethylene homopolymer and ethylene copolymer are commonly referred to as ethylene polymer or polyethylene. When there is a copolymerization unit, the ultra-high molecular weight polyethylene of the present invention is not a block copolymer, and its structure is a random copolymerization structure.

An ultra-high molecular weight polyethylene provided by the present invention is characterized in that the ultra-high molecular weight polyethylene has a viscosity-average molecular weight of 150-1000×10⁴ g/mol, preferably 200-850×10⁴ g/mol, more preferably 300-700×10⁴ g/mol, and a metal element content of 0-50 ppm, preferably 0-30 ppm, and said polyethylene satisfies at least one of condition (1) and condition (2):

• • Condition (1): tensile elasticity modulus is greater than 250 MPa, preferably greater than 280 MPa, more preferably greater than 300 MPa,
  • Condition (2): Young's modulus is greater than 300 MPa, preferably greater than 350 MPa.

In one embodiment of the present invention, said polyethylene has a bulk density of 0.30-0.55 g/cm³, preferably 0.33-0.52 g/cm³, more preferably 0.40-0.50 g/cm³. In one embodiment of the present invention, said polyethylene has a true density of 0.900-0.940 g/cm³, preferably 0.905-0.935 g/cm³, further preferably 0.915-0.930 g/cm³. In one embodiment of the present invention, said polyethylene has a melting point of 140-152° C., preferably 142-150° C. In one embodiment of the present invention, said polyethylene has a crystallinity of 40-75%, preferably 45-70%.

In one embodiment of the present invention, said polyethylene has a titanium content of 0-3 ppm, preferably 0-2 ppm, more preferably 0-1 ppm. In one embodiment of the present invention, said polyethylene has a calcium content of 0-5 ppm, preferably 0-3 ppm, more preferably 0-2 ppm. In one embodiment of the present invention, said polyethylene has a magnesium content of 0-10 ppm, preferably 0-5 ppm, more preferably 0-2 ppm. In one embodiment of the present invention, said polyethylene has an aluminum content of 0-30 ppm, preferably 0-20 ppm, more preferably 0-15 ppm. In one embodiment of the present invention, said polyethylene has a silicon content of 0-10 ppm, preferably 0-5 ppm, more preferably 0-3 ppm. In one embodiment of the present invention, said polyethylene has a chlorine content of 0-50 ppm, preferably 0-30 ppm.

In one embodiment of the present invention, when the polyethylene contains comonomer units, the polyethylene is a random copolymer, the comonomer molar insertion rate is 0.05-4.0%, preferably 0.10-2.0%.

In one embodiment of the present invention, said polyethylene satisfies at least one of the following condition (3) to condition (6):

• • Condition (3): the tensile yield strength is greater than 22 MPa, preferably greater than 25 MPa,
  • Condition (4): the tensile strength at break is greater than 32 MPa, preferably greater than 35 MPa,
  • Condition (5): the elongation at break is greater than 350%, preferably greater than 400%,
  • Condition (6): the impact strength is greater than 70 KJ/m², preferably greater than 75 KJ/m².

In one embodiment of the present invention, said polyethylene has an ash content of less than 200 ppm, preferably less than 150 ppm, more preferably 80 ppm or less.

In one embodiment of the present invention, when said polyethylene is an ethylene homopolymer, its viscosity-average molecular weight is 150-1000×10⁴ g/mol, preferably 200-850×10⁴ g/mol.

In one embodiment of the present invention, when the polyethylene is an ethylene homopolymer, it has a titanium content of 0-3 ppm, preferably 0-2 ppm, more preferably 0-1 ppm, a calcium content of 0-5 ppm, preferably 0-3 ppm, more preferably 0-2 ppm, a magnesium content of 0-10 ppm, preferably 0-5 ppm, more preferably 0-2 ppm, a aluminum content of 0-30 ppm, preferably 0-20 ppm, more preferably 0-15 ppm, a silicon content of 0-10 ppm, preferably 0-5 ppm, more preferably 0-3 ppm, a chlorine content of 0-50 ppm, preferably 0-30 ppm.

In one embodiment of the present invention, when said polyethylene is ethylene homopolymer, it has a bulk density of 0.30-0.55 g/cm³, preferably 0.33-0.52 g/cm³, more preferably 0.40-0.45 g/cm³, a true density of 0.910-0.940 g/cm³, preferably 0.915-0.935 g/cm³, more preferably 0.920-0.930 g/cm³, a melting point of 140-152° C., preferably 142-150° C., a crystallinity of 40-75%, preferably 45-70%.

In one embodiment of the present invention, when said polyethylene is ethylene homopolymer, it has a tensile yield strength of greater than 22 MPa, preferably greater than 25 MPa, a tensile strength at break of greater than 32 MPa, preferably greater than 35 MPa, an elongation at break of greater than 350%, preferably greater than 400%, an impact strength of greater than 70 KJ/m², preferably greater than 75 KJ/m², and a Young's modulus of greater than 300 MPa, preferably greater than 350 MPa.

In one embodiment of the present invention, when said polyethylene is ethylene homopolymer, it has an ash content of less than 200 ppm, preferably less than 150 ppm, more preferably 80 ppm or less.

In one embodiment of the present invention, when said polyethylene is an ethylene copolymer, it has a viscosity-average molecular weight of 150-800×10⁴ g/mol, preferably 200-700×10⁴ g/mol.

In one embodiment of the present invention, when said polyethylene is an ethylene copolymer, it has a titanium content of 0-3 ppm, preferably 0-2 ppm, more preferably 0-1 ppm, a calcium content of 0-5 ppm, preferably 0-3 ppm, more preferably 0-2 ppm, a magnesium content of 0-10 ppm, preferably 0-5 ppm, more preferably 0-2 ppm, an aluminum content of 0-30 ppm, preferably 0-20 ppm, more preferably 0-15 ppm, a silicon content of 0-10 ppm, preferably 0-5 ppm, more preferably 0-3 ppm, a chlorine content of 0-50 ppm, preferably 0-30 ppm.

In one embodiment of the present invention, when said polyethylene is an ethylene copolymer, it has a bulk density of 0.30-0.55 g/cm³, preferably 0.33-0.52 g/cm³, more preferably 0.41-0.50 g/cm³, a true density of 0.900-0.940 g/cm³, preferably 0.905-0.935 g/cm³, more preferably 0.910-0.930 g/cm³, a melting point of 140-152° C., preferably 142-150° C., a crystallinity of 40-75%, preferably 45-70%.

In one embodiment of the present invention, when the polyethylene is an ethylene copolymer, the copolymer has a random copolymerization structure, the comonomer molar insertion rate is 0.05-4.0%, preferably 0.10-2.0%.

In one embodiment of the present invention, when said polyethylene is an ethylene copolymer, the tensile elasticity modulus is greater than 250 MPa, preferably greater than 280 MPa, more preferably greater than 300 MPa.

In one embodiment of the present invention, when said polyethylene is an ethylene copolymer, it has an ash content of less than 200 ppm, preferably less than 150 ppm, more preferably 80 ppm or less.

The ultra-high molecular weight polyethylene provided by the present invention has a metal element content of 0-50 ppm, preferably 0-30 ppm.

The ultra-high molecular weight polyethylene of the present invention is obtained through the following ethylene slurry preparation process of the present invention. The present invention provides a process for preparing an ultra-high molecular weight polyethylene, wherein raw materials containing ethylene and optionally at least one como-nomer are subjected to slurry polymerization in the absence of hydrogen gas, using a supported non-metallocene catalyst as the main catalyst, using one or more of aluminoxane, alkyl aluminum, and haloalkyl aluminum as the cocatalyst, using an alkane solvent having a boiling point of 5-55° C. or a mixed alkane solvent having a saturated vapor pressure at 20° C. of 20-150 KPa (preferably 40-110 KPa) as the polymerization solvent.

In one embodiment of the present invention, In the process for preparing said ultra-high molecular weight polyethylene, the polymerization temperature is 50-100° C., preferably 60-90° C., and the polymerization pressure is 0.4-4.0 MPa, preferably 1.0-3.0 MPa, most preferably 1.5-3.0 MPa.

In one embodiment of the present invention, the slurry polymerization is a tank slurry polymerization.

In one embodiment of the present invention, in the process for preparing said ultra-high molecular weight polyethylene, the ethylene slurry polymerization activity is higher than 2×10⁴ gpolyethylene/g main catalyst, preferably the polymerization activity is higher than 3×10⁴ g polyethylene/g main catalyst, most preferably the polymerization activity is higher than 4×10⁴ g polyethylene/g main catalyst.

In one embodiment of the present invention, in the process for preparing said ultra-high molecular weight polyethylene, in case that the comonomer is present, the molar ratio of the comonomer to the active metal in the catalyst is 10-500:1, preferably 20-400:1, and ethylene and the comonomer are charged together into the polymerization to perform the one-step polymerization.

In one embodiment of the present invention, in the process for preparing said ultra-high molecular weight polyethylene, no hydrogen gas is used.

In the present invention, ethylene homopolymer refers to a homopolymer formed by homopolymerization of ethylene as the sole polymerization monomer, while ethylene copolymer refers to a copolymer formed by copolymerization of ethylene with at least one como-nomer that is not ethylene.

Specifically, for the ethylene copolymer, the comonomer is selected from alpha-olefins, diolefins, cyclic olefins and other olefinic unsaturated compounds. As said alpha-olefin, it can be a C₃-C₁₀ alpha-olefin, for example, propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 4-methyl-1-pentene, 4-methyl-1-hexene, 1-octene, 1-decene, 1-undecene, 1-dodecene, and styrene can be enumerated. As the cyclic olefin, for example, 1-cyclopentene, ethylidene norbornene, and norbornene can be enumerated. As the diolefin, for example, 1,4-butadiene, 2,5-pentadiene, 1,5-hexadiene, vinylnorbornene, norbornadiene, 1,7- octadiene and the like can be enumerated. As said other olefinic unsaturated compound, for example, vinyl acetate, (meth)acrylate and the like can be enumerated. Among them, the comonomer is preferably C₃-C₁₀ alpha-olefin, more preferably selected from 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, and mixtures thereof, and further preferably selected from 1-butene, 1-hexene, 1-octene, and mixtures thereof.

The alpha-olefins as the comonomer can be used alone or in combination of two or more of them. In one embodiment of the present invention, when the comonomer is used in the polymerization reaction, the molar ratio of the comonomer to the active metal in the catalyst can be 10-500:1, preferably 20-400:1, more preferably 50-300:1. In one embodiment of the present invention, when the comonomer is used in the polymerization reaction, relative to the total mole number of ethylene and the comonomer, the proportion of the comonomer is 0.01-3 mol %, preferably 0.01-2 mol %.

Moreover, during the polymerization reaction, ethylene and the comonomer are charged together into the polymerization tank. In the present invention, “ethylene and the comonomer are charged together into the polymerization tank” refers to feeding raw materials containing ethylene and the comonomer together into the reaction tank and performing the polymerization reaction together without the presence of segmented polymerization steps, that is, there are neither segmented steps of first polymerizing ethylene and then adding the comonomer for the polymerization, nor segmented steps of homogenizing the comonomer and then adding ethylene for the polymerization.

According to the present invention, the supported non-metallocene catalyst as the main catalyst can be prepared by using well-known processes in the art, such as the following process:

• • a step of dissolving a magnesium compound in a first solvent in the presence of an alcohol to obtain a magnesium compound solution; a step of mixing a porous support that optionally has undergone a thermal activation treatment and/or a chemical activation treatment with the magnesium compound solution to obtain a first mixed slurry; a step of adding a precipitating agent to the first mixed slurry or drying the first mixed slurry to obtain a composite support; a step of contacting the composite support with a chemical treating agent selected from Group IVB metal compounds to obtain a modified composite support; a step of contacting a non-metallocene complex with the modified composite support in the presence of a second solvent to obtain a second mixed slurry, and optionally drying to obtain the supported non-metallocene catalyst.

The explanation about the magnesium compound will be provided hereinafter.

According to the present invention, the term “magnesium compound” involves an ordinary concept in the art, referring to an organic or inorganic solid anhydrous magnesium-containing compound that is commonly used as the support in the supported olefin polymerization catalyst.

Specifically, as magnesium halide, for example, magnesium chloride (MgCl₂), magnesium bromide (MgBr₂), magnesium iodide (MgI₂) and magnesium fluoride (MgF₂) can be enumerated, wherein magnesium chloride is preferable.

As alkoxy magnesium halide, for example, methyloxy magnesium chloride (Mg(OCH₃)Cl), ethyloxy magnesium chloride (Mg(OC₂H₅)Cl), propyloxy magnesium chloride (Mg(OC₃H₇)Cl), n-butyloxy magnesium chloride (Mg(OC₄H₉)Cl), iso-butyloxy magnesium chloride (Mg(i-OC₄H₉)Cl), methyloxy magnesium bromide (Mg(OCH₃)Br), ethyloxy magnesium bromide (Mg(OC₂H₅)Br), propyloxy magnesium bromide (Mg(OC₃H₇)Br), n-butyloxy magnesium bromide (Mg(OC₄H₉)Br), iso-butyloxy magnesium bromide (Mg(i-OC₄H₉)Br), methyloxy magnesium iodide (Mg(OCH₃)I), ethyloxy magnesium iodide (Mg(OC₂H₅)I), propyloxy magnesium iodide (Mg(OC₃H₇)I), n-butyloxy magnesium iodide (Mg(OC₄H₉)I), iso-butyloxy magnesium iodide (Mg(i-OC₄H₉)I) and the like can be enumerated, wherein methyloxy magnesium chloride, ethyloxy magnesium chloride and iso-butyloxy magnesium chloride are preferable.

As alkoxy magnesium, for example, methyloxy magnesium (Mg(OCH₃)₂), ethyloxy magnesium (Mg(OC₂H₅)₂), propyloxy magnesium (Mg(OC₃H₇)₂), butyloxy magnesium (Mg(OC₄H₉)₂), iso-butyloxy magnesium (Mg(i-OC₄H₉)₂), 2-ethyl hexyloxy magnesium (Mg(OCH₂CH(C₂H₅)C₄H₈)₂) and the like can be enumerated, wherein ethyloxy magnesium and iso-butyloxy magnesium are preferable.

As alkyl magnesium, for example, methyl magnesium (Mg(CH₃)₂), ethyl magnesium (Mg(C₂H₅)₂), propyl magnesium (Mg(C₃H₇)₂), n-butyl magnesium (Mg(C₄H₉)₂), iso-butyl magnesium (Mg(i-C₄H₉)₂) and the like can be enumerated, wherein ethyl magnesium and n-butyl magnesium are preferable.

As alkyl magnesium halide, for example, methyl magnesium chloride (Mg(CH₃)Cl), ethyl magnesium chloride (Mg(C₂H₅)Cl), propyl magnesium chloride (Mg(C₃H₇)Cl), n-butyl magnesium chloride (Mg(C₄H₉)Cl), iso-butyl magnesium chloride (Mg(i-C₄H₉)Cl), methyl magnesium bromide (Mg(CH₃)Br), ethyl magnesium bromide (Mg(C₂H₅)Br), propyl magnesium bromide (Mg(C₃H₇)Br), n-butyl magnesium bromide (Mg(C₄H₉)Br), iso-butyl magnesium bromide (Mg(i-C₄H₉)Br), methyl magnesium iodide (Mg(CH₃)I), ethyl magnesium iodide (Mg(C₂H₅)I), propyl magnesium iodide (Mg(C₃H₇)I), n-butyl magnesium iodide (Mg(C₄H₉)I), iso-butyl magnesium iodide (Mg(i-C₄H₉)I) and the like can be enumerated, wherein methyl magnesium chloride, ethyl magnesium chloride and iso-butyl magnesium chloride are preferable.

As alkyl alkoxy magnesium, for example, methyl methyloxy magnesium (Mg(OCH₃)(CH₃)), methyl ethyloxy magnesium (Mg(OC₂H₅)(CH₃)), methyl propyloxy magnesium (Mg(OC₃H₇)(CH₃)), methyl n-butyloxy magnesium (Mg(OC₄H₉)(CH₃)), methyl iso-butyloxy magnesium (Mg(i-OC₄H₉)(CH₃)), ethyl methyloxy magnesium (Mg(OCH₃)(C₂H₅)), ethyl ethyloxy magnesium (Mg(OC₂H₅)(C₂H₅)), ethyl propyloxy magnesium (Mg(OC₃H₇)(C₂H₅)), ethyl n-butyloxy magnesium (Mg(OC₄H₉)(C₂H₅)), ethyl iso-butyloxy magnesium (Mg(i-OC₄H₉)(C₂H₅)), propyl methyloxy magnesium (Mg(OCH₃)(C₃H₇)), propyl ethyloxy magnesium (Mg(OC₂H₅)(C₃H₇)), propyl propyloxy magnesium (Mg(OC₃H₇)(C₃H₇)), propyl n-butyloxy magnesium (Mg(OC₄H₉)(C₃H₇)), propyl iso-butyloxy magnesium (Mg(i-OC₄H₉)(C₃H₇)), n-butyl methyloxy magnesium (Mg(OCH₃)(C₄H₉)), n-butyl ethyloxy magnesium (Mg(OC₂H₅)(C₄H₉)), n-butyl propyloxy magnesium (Mg(OC₃H₇)(C₄H₉)), n-butyl n-butyloxy magnesium (Mg(OC₄H₉)(C₄H₉)), n-butyl iso-butyloxy magnesium (Mg(i-OC₄H₉)(C₄H₉)), iso-butyl methyloxy magnesium (Mg(OCH₃)(i-C₄H₉)), iso-butyl ethyloxy magnesium (Mg(OC₂H₅)(i-C₄H₉)), iso-butyl propyloxy magnesium (Mg(OC₃H₇)(i-C₄H₉)), iso-butyl n-butyloxy magnesium (Mg(OC₄H₉)(i-C₄H₉)), iso-butyl iso-butyloxy magnesium (Mg(i-OC₄H₉)(i-C₄H₉)) and the like can be enumerated, wherein butyl ethyloxy magnesium is preferable.

These magnesium compounds can be used alone or in combination without any special limitation.

When used in combination, the molar ratio of two magnesium compounds in the mixture of magnesium compounds is, for example, 0.25-4:1, preferably 0.5-3:1, more preferably 1-2:1.

The explanation about the step of obtaining the magnesium compound solution will be provided hereinafter.

According to this step, the magnesium compound is dissolved in the first solvent (hereinafter sometimes also referred to as a solvent for dissolving the magnesium compound) in the presence of the alcohol to obtain the magnesium compound solution.

As the first solvent, for example, solvents such as C_6-12 aromatic hydrocarbons, halogenated C_6-12 aromatic hydrocarbons, C_5-12 alkanes, esters, and ethers can be enumerated.

As the C_6-12 aromatic hydrocarbon, for example, toluene, xylene, trimethylbenzene, ethylbenzene, and diethylbenzene can be enumerated.

As the halogenated C_6-12 aromatic hydrocarbon, for example, chlorotoluene, chloroethylbenzene, bromotoluene, bromoethylbenzene and the like can be enumerated.

As the C_5-12 alkane, for example, pentane, hexane, heptane, octane, nonane, and decane can be enumerated, wherein hexane, heptane, and decane are preferable, and hexane is most preferable.

As the ester, for example, methyl formate, ethyl formate, propyl formate, butyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, butyl propionate, butyl butyrate and the like can be enumerated.

As the ether, for example, diethylether, methylethylether, tetrahydrofuran, and the like can be enumerated.

Among them, C_6-12 aromatic hydrocarbons, C_5-12 alkanes, and tetrahydrofuran are preferable, and tetrahydrofuran is most preferable.

These solvents can be used alone or in combination at any proportion.

According to the present invention, the term ‘alcohol’ refers to a compound obtained by replacing at least one hydrogen atom on a hydrocarbon chain (such as C_1-30 hydrocarbon) with hydroxyl group(s). It can be selected from aliphatic alcohols, aromatic alcohols, alicyclic alcohols and mixtures thereof.

As the alcohol, for example, C_1-30 aliphatic alcohols (preferably C_1-30 aliphatic monohydric alcohols), C_6-30 aromatic alcohols (preferably C_6-30 aromatic monohydric alcohols), and C_4-30 alicyclic alcohols (preferably C_4-30 alicyclic monohydric alcohols) can be enumerated, wherein C_1-30 aliphatic monohydric alcohols or C_2-8 aliphatic monohydric alcohols are preferable, and ethanol and butanol are more preferable. In addition, the alcohol can be optionally substituted with at least one substituent selected from halogen atoms or C_1-6 alkoxy groups.

As the C_1-30 aliphatic alcohol, for example, methanol, ethanol, propanol, 2-propanol, butanol, pentanol, 2-methylpentanol, 2-ethylpentanol, 2-hexylbutanol, hexanol, and 2-ethylhexanol and the like can be enumerated, wherein ethanol, butanol, and 2-ethylhexanol are preferable.

As the C_6-30 aromatic alcohol, for example, benzyl alcohol, phenylethyl alcohol, and methylbenzyl alcohol can be enumerated, wherein phenylethyl alcohol is preferable.

As the C_4-30 alicyclic alcohol, for example, cyclohexanol, cyclopentanol, cyclooctanol, methylcyclopentanol, ethylcyclopentanol, propylcyclopentanol, methylcyclohexanol, ethylcyclohexanol, propylcyclohexanol, methylcyclooctanol, ethylcyclooctanol and propylcyclooctanol and the like can be enumerated, wherein cyclohexanol and methylcyclohexanol are preferable.

As the halogen-substituted alcohol, for example, trichloromethanol, trichloroethanol, trichlorohexanol and the like can be enumerated, wherein trichloromethanol is preferable.

As the alkoxy-substituted alcohol, for example, ethylene glycol-ethyl ether, ethylene glycol-n-butyl ether, 1-butoxy-2-propanol and the like can be enumerated, wherein ethylene glycol-ethyl ether is preferable.

These alcohols can be used alone or in combination. When used in combination, the ratio of any two alcohols in the alcohol mixture can be arbitrarily determined without special limitations.

In order to prepare the magnesium compound solution, the magnesium compound can be added to a mixed solvent formed from the first solvent and the alcohol for dissolution, or the magnesium compound can be added to the first solvent and the alcohol can be added simultaneously or subsequently for dissolution, but not limited thereto. The preparation time of the magnesium compound solution (i.e. the dissolution time of the magnesium compound) is not particularly limited, but is generally 0.5-24 hours, preferably 4-24 hours. During the preparation process, stirring can be used to promote the dissolution of the magnesium compound. The stirring can be performed in any manner, for example, with a stirring paddle (usually with a rotation speed of 10-1000 rpm) and the like. As needed, sometimes dissolution can be promoted by appropriate heating (but the maximum temperature must be lower than the boiling points of the first solvent and the alcohol).

According to the present invention, the porous support that optionally has undergone a thermal activation treatment and/or a chemical activation treatment is mixed with the magnesium compound solution to obtain the first mixed slurry.

The explanation about the porous support will be provided hereinafter.

According to the present invention, as the porous support, for example those organic or inorganic porous solids conventionally used as the support in the preparation of a supported olefin polymerization catalyst in the art can be enumerated.

Specifically, as said organic porous solid, for example, olefin homopolymer or copolymer, polyvinyl alcohol or a copolymer thereof, cyclodextrin, (co)polyester, (co)polyamide, vinyl chloride homopolymer or copolymer, acrylate homopolymer or copolymer, methacrylate homopolymer or copolymer, styrene homopolymer or copolymer and the like, and a partially crosslinked form of these homopolymers or copolymers can be enumerated, wherein a partially crosslinked styrene polymer (for example having a crosslinking degree of at least 2% but less than 100%) is preferable.

According to a preferred embodiment of the present invention, it is preferable to have any one or more active functional groups on the surface of the organic porous solid, for example selected from hydroxy, primary amino, secondary amino, sulfonic group, carboxyl, amido, N-mono-substituted amido, sulfamido, N-mono-substituted sulfamido, mercapto, imido and hydrazido, preferably at least one of carboxyl and hydroxy.

According to one embodiment of the present invention, the organic porous solid is subjected to a thermal activation treatment and/or a chemical activation treatment before use.

According to the present invention, the organic porous solid can be only subjected to a thermal activation treatment before use, or can be also only subjected to a chemical activation treatment before use, or can be subjected to said thermal activation treatment and said chemical activation treatment in any combination order before use, without special limitations.

The thermal activation treatment can be carried out according to a usual manner. For example, said organic porous solid is heated under a reduced pressure or in an inert atmosphere. The inert atmosphere herein means that the gas contains only a very small amount of the component that can be reacted with said organic porous solid or is free of the component that can be reacted with said organic porous solid. As said inert atmosphere, for example, nitrogen gas atmosphere or noble gas atmosphere can be enumerated, wherein nitrogen gas atmosphere is preferable. Since the organic porous solid has poor heat resistance, the thermal activation process should be carried out based on a prerequisite that it does not damage the structure and basic composition of the organic porous solid itself. Generally, the thermal activation temperature is 50-400° C., preferably 100-250° C., and the thermal activation time is 1-24 hours, preferably 2-12 hours.

After the thermal activation/chemical activation treatment, the organic porous solid needs to be kept under a positive pressure in an inert atmosphere for later use.

As said inorganic porous solid, for example, refractory oxides of Group IIA, IIIA, IVA or IVB metal of the periodic table of elements (for example silica (also known as silicon oxide or silica gel), alumina, magnesia, titania, zirconia, thoria or the like), or any refractory composite oxide of these metals (for example silica-alumina, magnesia-alumina, titania-silica, titania-magnesia and titania-alumina or the like), and clay, molecular sieve (for example ZSM-5 and MCM-41), mica, montmorillonite, bentonite, diatomaceous earth and the like can be enumerated. As said inorganic porous solid, an oxide formed by the pyrohydrolysis of a gaseous metal halide or a gaseous silicon compound, for example silica gel obtained by the pyrohydrolysis of silicon tetrachloride, alumina obtained by the pyrohydrolysis of aluminium trichloride, or the like can also be enumerated.

As said inorganic porous solid, silica, alumina, magnesia, silica-alumina, magnesia-alumina, titania-silica, titania, molecular sieve, montmorillonite and the like are preferable, and silica is particularly preferable.

According to the present invention, a suitable silica can be produced by a conventional process, or may be any commercially available product, for example, Grace 955, Grace 948, Grace SP9-351, Grace SP9-485, Grace SP9-10046, Grace 2480D, Grace 2212D, Grace 2485, Daysion Syloid 245 and Aerosil812 available from the Grace company; ES70, ES70X, ES70Y, ES70W, ES757, EP10X and EP11 available from the Ineos company; and CS-2133 and MS-3040 available from the PQ company.

According to a preferred embodiment of the present invention, it is preferable to have active functional groups such as hydroxy on the surface of the inorganic porous solid.

According to one embodiment of the present invention, the inorganic porous solid is subjected to a thermal activation treatment and/or a chemical activation treatment before use.

According to the present invention, the inorganic porous solid can be only subjected to a thermal activation treatment before use, or can be also only subjected to a chemical activation treatment before use, or can be subjected to said thermal activation treatment and said chemical activation treatment in any combination order before use, without special limitations.

The thermal activation treatment can be carried out in the usual way, e.g. heating the inorganic porous solid under reduced pressure or inert atmosphere. The inert atmosphere herein means that the gas contains only a very small amount of the component that can be reacted with said inorganic porous solid or is free of the component that can be reacted with said inorganic porous solid. As said inert atmosphere, for example, nitrogen gas atmosphere or noble gas atmosphere can be enumerated, wherein nitrogen gas atmosphere is preferable. Generally, the thermal activation temperature is 200-800° C., preferably 400-700° C., most preferably 400-650° C., and the heating time is for example 0.5-24 hours, preferably 2-12 hours, most preferably 4-8 hours.

After the thermal activation/chemical activation treatment, the inorganic porous solid needs to be kept under a positive pressure in an inert atmosphere for later use.

According to the present invention, the chemical activation treatment of the organic porous solid or the inorganic porous solid can be carried out in the usual manner. For example, a process of using a chemical activator to chemically activate the organic porous solid or the inorganic porous solid can be enumerated.

According to the present invention, the Group IVB metal compound is used as the chemical activator.

As said Group IVB metal compound, for example, at least one of Group IVB metal halide, Group IVB metal alkyl compound, Group IVB metal alkoxy compound, Group IVB metal alkyl halide and Group IVB metal alkoxy halide can be enumerated.

As said Group IVB metal compound, said Group IVB metal halide is preferable, TiCl₄, TiBr₄, ZrCl₄, ZrBr₄, HfCl₄ and HfBr₄ are more preferable, and TiCl₄ and ZrCl₄ are most preferable.

These Group IVB metal compounds can be used alone or in combination at any proportion.

When the chemical activator is liquid at normal temperature, it can be directly used by dropwise adding a predetermined amount of the chemical activator to the organic porous solid or inorganic porous solid to be activated with the chemical activator.

When the chemical activator is solid at normal temperature, it is preferred to use the chemical activator in solution form for ease of measurement and operation. Of course, when the chemical activator is liquid at room temperature, it can sometimes be used in solution form as needed, without special limitations.

When preparing a solution of the chemical activator, there is no special limit on the solvent used at this time, as long as it can dissolve the chemical activator.

Specifically, C_5-12 alkane, C_5-12 cycloalkane, halogenated C_5-12 alkane, halogenated C_5-12 cycloalkane, C_6-12 aromatic hydrocarbon, halogenated C_6-12 aromatic hydrocarbon and the like, can be enumerated, for example, pentane, hexane, heptane, octane, nonane, decane, undecane, dodecane, cyclopentane, cyclohexane, cycloheptane, cyclooctane, toluene, ethylbenzene, xylene, chloropentane, chlorohexane, chloroheptane, chlorooctane, chlorononane, chlorodecane, chloroundecane, chlorododecane, chlorocyclohexane, chlorotoluene, chloroethylbenzene, chloroxylene and the like can be enumerated, wherein pentane, hexane, decane, cyclohexane and toluene are preferable, hexane and toluene are most preferable.

These solvents can be used alone or in combination at any proportion.

In addition, there is no special limit on the concentration of the chemical activator in its solution, and it can be appropriately selected as required, as long as it can achieve the chemical activation with a predetermined amount of the chemical activator. As mentioned earlier, if the chemical activator is liquid, it can be directly used for activation, but it can also be formulated into a chemical activator solution and used.

Conveniently, the molar concentration of the chemical activator in its solution is generally set at 0.01-1.0 mol/L, but is not limited thereto.

As the process of performing the chemical activation, for example, the following can be enumerated: in the case that the chemical activator is solid (e.g. zirconium tetrachloride), a solution of the chemical activator is first prepared, and then a solution containing a predetermined amount of the chemical activator is added (preferably dropwise) to the organic or inorganic porous solid to be activated to perform the chemical activation reaction. In the case that the chemical activator is liquid (e.g. titanium tetrachloride), a predetermined amount of the chemical activator can be directly added (preferably dropwise) to the organic porous solid or inorganic porous solid to be activated to perform the chemical activation reaction, or the chemical activator is prepared into a solution, and then to the organic porous solid or inorganic porous solid to be activated is added (preferably dropwise) the solution containing a predetermined amount of said chemical activator to perform the chemical activation reaction.

Generally speaking, the chemical activation reaction (with stirring if necessary) is performed for 0.5-24 hours, preferably 1-8 hours, and more preferably 2-6 hours at a reaction temperature of −30 to 60° C. (preferably −20 to 30° C.).

After the chemical activation reaction is completed, the organic porous solid or inorganic porous solid that has undergone the chemical activation can be obtained through filtering, washing, and drying.

According to the present invention, the filtering, washing, and drying can be carried out according to the conventional processes, wherein the washing solvent can be the same solvent as used for dissolving the chemical activator. As required, the washing is generally performed 1-8 times, preferably 2-6 times, and most preferably 2-4 times.

The drying can be performed by using conventional processes, e.g. inert gas drying, drying in vacuum or heating and drying in vacuum, preferably inert gas drying or heating and drying in vacuum, most preferably heating and drying in vacuum. The drying temperature range is generally from normal temperature to 140° C., the drying time is generally 2-20 hours, but not limited thereto.

According to the present invention, the chemical activator is used in such an amount that the ratio of the porous support to the chemical activator as Group IVB metal elements is 1 g:1-100 mmol, preferably 1 g:2-5 mmol, more preferably 1 g:10-25 mmol.

According to the present invention, there is no specific limit on the surface area of the porous support, but it is generally 10-1000 m²/g (measured by BET process), preferably 100-600 m²/g; the pore volume of the porous support (measured by nitrogen adsorption method) is generally 0.1-4 cm³/g, preferably 0.2-2 cm³/g, and its average particle size (measured by laser particle size analyzer) is preferably 1-500 mm, more preferably 1-100 mm.

According to the present invention, the porous support can be in any morphology, such as micropowder, granular, spherical, aggregate, or other forms.

The porous support (that optionally has undergone a thermal activation treatment and/or a chemical activation treatment) is mixed with the magnesium compound solution to obtain the first mixed slurry.

According to the present invention, the process of mixing the porous support and the magnesium compound solution can be carried out by using conventional processes without special limitations. For example, the following can be enumerated: in the range from normal temperature to the temperature at which the magnesium compound solution is prepared, the porous support is added in a metered amount to the magnesium compound solution or the magnesium compound solution is added in a metered amount to the porous support, the resulting material is mixed for 0.1-8 hours, preferably 0.5-4 hours, preferably 1-2 hours (with stirring if necessary).

According to the present invention, the porous support is used in such an amount that the mass ratio of the magnesium compound (as the solid magnesium compound contained in the magnesium compound solution) to the porous support reaches 1:0.1-20, preferably 1:0.5-10, more preferably 1:1-5.

At this point, the obtained first mixed slurry is a slurry-like system. Although it is not necessary, in order to ensure the uniformity of the system, the first mixed slurry is preferably placed in a sealed state for a certain period of time (2-48 hours, preferably 4-24 hours, most preferably 6-18 hours) after the preparation.

According to the present invention, a solid product with good flowability can be obtained by directly drying the first mixed slurry, and it is a composite support of the present invention.

At this point, the direct drying can be carried out by using conventional processes, e.g. drying in an inert gas atmosphere, drying in vacuum, heating and drying in vacuum, or the like, wherein heating and drying in vacuum is preferable. The drying temperature is generally 30-160° C., preferably 60-130° C., and the drying time is generally 2-24 hours, but not limited thereto in some cases.

Alternatively, according to the present invention, a composite support can be obtained by adding a precipitating agent in a metered amount to the first mixed slurry to precipitate solid substances from the first mixed slurry.

The explanation about the precipitating agent will be provided hereinafter.

According to the present invention, the term “precipitating agent” involves an ordinary concept in the art, and refers to a chemically inert liquid that can reduce the solubility of a solid solute (e.g. the magnesium compound, the porous support, the non-metallocene ligand, or the non-metallocene complex, and the like) in its solution and subsequently precipitate them in solid form from the solution.

According to the present invention, as the precipitating agent, for example, such a solvent can be enumerated that it is a poor solvent for the solid solute to be precipitated (e.g. the magnesium compound, the porous support, the non-metallocene ligand, the non-metallocene complexe, or the like), but a good solvent relative to the solvent for dissolving the solid solute (e.g. the magnesium compound). For example, C_5-12 alkanes, C_5-12 cycloalkanes, halogenated C_1-10 alkanes, and halogenated C_5-12 cycloalkanes can be enumerated.

As the C_5-12 alkane, for example, pentane, hexane, heptane, octane, nonane, and decane can be enumerated, wherein hexane, heptane, and decane are preferable, and hexane is most preferable.

As said C_5-12 cycloalkane, for example, cyclohexane, cyclopentane, cycloheptane, cyclodecane, cyclononane and the like can be enumerated, and cyclohexane is most preferable.

As said halogenated C_1-10 alkane, for example, the following can be enumerated: dichloromethane, dichlorohexane, dichloroheptane, trichloromethane, trichloroethane, trichlorobutane, dibromomethane, dibromoethane, dibromoheptane, tribromomethane, tribromoethane, tribromobutane and the like.

As said halogenated C_5-12 cycloalkane, for example, the following can be enumerated: chlorocyclopentane, chlorocyclohexane, chlorocycloheptane, chlorocyclooctane, chlorocyclononane, chlorocyclodecane, bromocyclopentane, bromocyclohexane, bromocycloheptane, bromocyclooctane, bromocyclononane, bromocyclodecane and the like.

These precipitating agents can be used alone or in combination at any proportion.

The precipitating agent can be added in one shot or dropwise, preferably in one shot. During this precipitation process, stirring can be used to promote the dispersion of the precipitating agent and facilitate the final precipitation of the solid product. The stirring can be done in any form (e.g. with a stirring paddle), and the rotation speed is usually 10-1000 rpm and the like.

There is no specific limit on the used amount of the precipitating agent, but generally by volume, the ratio of the precipitating agent to the solvent used to dissolve the magnesium compound is 1:0.2-5, preferably 1:0.5-2, more preferably 1:0.8-1.5.

There is no specific limit on the temperature of the used precipitating agent, but it is generally preferable to be from normal temperature to a temperature that is below the boiling point of any of the used solvents and the boiling point of the precipitating agent (preferably 20-80° C., more preferably 40-60° C.), but not limited thereto in some cases. Moreover, it is generally preferable to perform the precipitation process at a temperature in the range from normal temperature to a temperature that is below the boiling point of any of the used solvents and the boiling point of the precipitating agent (preferably 20-80° C., more preferably 40-60° C.) for 0.3-12 hours, but not limited thereto in some cases, subject to substantially complete precipitation of the solid product.

After the complete precipitation, the obtained solid product is filtered, washed, and dried. There is no specific limitation on the processs of filtering, washing, and drying, and those commonly used in this field can be used as required.

As required, the washing is generally performed 1-6 times, preferably 3-4 times. Among them, the used washing solvent is preferably identical to the solvent for the precipitating agent, but it can also be different.

The drying can be performed by using conventional processes, e.g. inert gas drying, drying in vacuum or heating and drying in vacuum, preferably inert gas drying or heating and drying in vacuum, most preferably heating and drying in vacuum.

The drying temperature range is generally from normal temperature to 140° C. The drying time is generally 2-20 hours, but it can also vary depending on the solvent used to dissolve the magnesium compound. For example, when tetrahydrofuran is used as a solvent for dissolving the magnesium compound, the drying temperature is generally around 80° C., and the drying should be carried out in vacuum for 2-12 hours, while when toluene is used as a solvent for dissolving the magnesium compound, the drying temperature is generally around 100° C., and the drying should be carried out in vacuum for 4-24 hours.

According to the present invention, a modified composite support is obtained by contacting the aforementioned obtained composite support with a chemical treating agent selected from Group IVB metal compounds.

The explanation about the chemical treating agent will be provided hereinafter.

According to the present invention, the Group IVB metal compound is used as the chemical treating agent.

As said Group IVB metal compound, for example, at least one of Group IVB metal halide, Group IVB metal alkyl compound, Group IVB metal alkoxy compound, Group IVB metal alkyl halide and Group IVB metal alkoxy halide can be enumerated.

As said Group IVB metal halide, said Group IVB metal alkyl compound, said Group IVB metal alkoxy compound, said Group IVB metal alkyl halide and said Group IVB metal alkoxy halide, for example, a compound having a structure represented by the following general formula can be enumerated:

M(OR¹)_mX_nR²_4-m-n

wherein in is 0, 1, 2, 3 or 4; n is 0, 1, 2, 3 or 4; M represents the Group IVB metal of the periodic table of elements, for example, titanium, zirconium, hafnium, and the like; X is halogen, for example F, Cl, Br, and I; and IV and R² are each independently selected from C_1-10 alkyl groups, for example methyl, ethyl, propyl, n-butyl, isobutyl, and the like. R¹ and R² can be identical or different.

Specifically, as said Group IVB metal halide, for example, the following can be enumerated: titanium tetrafluoride (TiF₄), titanium tetrachloride (TiCl₄), titanium tetrabromide (TiBr₄), titanium tetraiodide (TiI₄); zirconium tetrafluoride (ZrF₄), zirconium tetrachloride (ZrCl₄), zirconium tetrabromide (ZrBr₄), zirconium tetraiodide (ZrI₄); hafnium tetrafluoride (HfF₄), hafnium tetrachloride (HfCl₄), hafnium tetrabromide (HfBr₄), and hafnium tetraiodide (HfI₄).

As said Group IVB metal alkyl compound, for example, the following can be enumerated: tetra-methyl titanium (Ti(CH₃)₄), tetra-ethyl titanium (Ti(CH₃CH₂)₄), tetra-iso-butyl titanium (Ti(i-C₄H₉)₄), tetra-n-butyl titanium (Ti(C₄H₉)₄), triethyl methyl titanium (Ti(CH₃)(CH₃CH₂)₃), diethyl dimethyl titanium (Ti(CH₃)₂(CH₃CH₂)₂), trimethyl ethyl titanium (Ti(CH₃)₃(CH₃CH₂)), tri-iso-butyl methyl titanium (Ti(CH₃)(i-C₄H₉)₃), bis-iso-butyl dimethyl titanium (Ti(CH₃)₂(i-C₄H₉)₂), trimethyl iso-butyl titanium (Ti(CH₃)₃(i-C₄H₉)), tri-iso-butyl ethyl titanium (Ti(CH₃CH₂)(i-C₄H₉)₃), bis-iso-butyl diethyl titanium (Ti(CH₃CH₂)₂(i-C₄H₉)₂), triethyl iso-butyl titanium (Ti(CH₃CH₂)₃(i-C₄H₉)), tri-n-butyl methyl titanium (Ti(CH₃)(C₄H₉)₃), bis-n-butyl dimethyl titanium (Ti(CH₃)₂(C₄H₉)₂), trimethyl n-butyl titanium (Ti(CH₃)₃(C₄H₉)), tri-n-butyl ethyl titanium (Ti(CH₃CH₂)(C₄H₉)₃), bis-n-butyl diethyl titanium (Ti(CH₃CH₂)₂(C₄H₉)₂), triethyl n-butyl titanium (Ti(CH₃CH₂)₃(C₄H₉)) and the like; tetra-methyl zirconium (Zr(CH₃)₄), tetra-ethyl zirconium (Zr(CH₃CH₂)₄), tetra-iso-butyl zirconium (Zr(i-C₄H₉)₄), tetra-n-butyl zirconium (Zr(C₄H₉)₄), triethyl methyl zirconium (Zr(CH₃)(CH₃CH₂)₃), diethyl dimethyl zirconium (Zr(CH₃)₂(CH₃CH₂)₂), trimethyl ethyl zirconium (Zr(CH₃)₃(CH₃CH₂)), tri-iso-butyl methyl zirconium (Zr(CH₃)(i-C₄H₉)₃), bis-iso-butyl dimethyl zirconium (Zr(CH₃)₂(i-C₄H₉)₂), trimethyl iso-butyl zirconium (Zr(CH₃)₃(i-C₄H₉)), tri-iso-butyl ethyl zirconium (Zr(CH₃CH₂)(i-C₄H₉)₃), bis-iso-butyl diethyl zirconium (Zr(CH₃CH₂)₂(i-C₄H₉)₂), triethyl iso-butyl zirconium (Zr(CH₃CH₂)₃(i-C₄H₉)), tri-n-butyl methyl zirconium (Zr(CH₃)(C₄H₉)₃), bis-n-butyl dimethyl zirconium (Zr(CH₃)₂(C₄H₉)₂), trimethyl n-butyl zirconium (Zr(CH₃)₃(C₄H₉)), tri-n-butyl ethyl zirconium (Zr(CH₃CH₂)(C₄H₉)₃), bis-n-butyl diethyl zirconium (Zr(CH₃CH₂)₂(C₄H₉)₂), triethyl n-butyl zirconium (Zr(CH₃CH₂)₃(C₄H₉)) and the like; tetra-methyl hafnium (Hf(CH₃)₄), tetra-ethyl hafnium (Hf(CH₃CH₂)₄), tetra-iso-butyl hafnium (Hf(i-C₄H₉)₄), tetra-n-butyl hafnium (Hf(C₄H₉)₄), triethyl methyl hafnium (Hf(CH₃)(CH₃CH₂)₃), diethyl dimethyl hafnium (Hf(CH₃)₂(CH₃CH₂)₂), trimethyl ethyl hafnium (Hf(CH₃)₃(CH₃CH₂)), tri-iso-butyl methyl hafnium (Hf(CH₃)(i-C₄H₉)₃), bis-iso-butyl dimethyl hafnium (Hf(CH₃)₂(i-C₄H₉)₂), trimethyl iso-butyl hafnium (Hf(CH₃)₃(i-C₄H₉)), tri-iso-butyl ethyl hafnium (Hf(CH₃CH₂)(i-C₄H₉)₃), bis-iso-butyl diethyl hafnium (Hf(CH₃CH₂)₂(i-C₄H₉)₂), triethyl iso-butyl hafnium (Hf(CH₃CH₂)₃(i-C₄H₉)), tri-n-butyl methyl hafnium (Hf(CH₃)(C₄H₉)₃), bis-n-butyl dimethyl hafnium (Hf(CH₃)₂(C₄H₉)₂), trimethyl n-butyl hafnium (Hf(CH₃)₃(C₄H₉)), tri-n-butyl ethyl hafnium (Hf(CH₃CH₂)(C₄H₉)₃), bis-n-butyl diethyl hafnium (Hf(CH₃CH₂)₂(C₄H₉)₂), triethyl n-butyl hafnium (Hf(CH₃CH₂)₃(C₄H₉)) and the like.

As said Group IVB metal alkoxy compound, for example, the following can be enumerated: tetra-methyloxy titanium (Ti(OCH₃)₄), tetra-ethyloxy titanium (Ti(OCH₃CH₂)₄), tetra-iso-butyloxy titanium (Ti(i-OC₄H₉)₄), tetra-n-butyloxy titanium (Ti(OC₄H₉)₄), tri-ethyloxy methyloxy titanium (Ti(OCH₃)(OCH₃CH₂)₃), di-ethyloxy di-methyloxy titanium (Ti(OCH₃)₂(OCH₃CH₂)₂), tri-methyloxy ethyloxy titanium (Ti(OCH₃)₃(OCH₃CH₂)), tri-iso-butyloxy methyloxy titanium (Ti(OCH₃)(i-OC₄H₉)₃), bis-iso-butyloxy di-methyloxy titanium (Ti(OCH₃)₂(i-OC₄H₉)₂), tri-methyloxy iso-butyloxy titanium (Ti(OCH₃)₃(i-OC₄H₉)), tri-iso-butyloxy ethyloxy titanium (Ti(OCH₃CH₂)(i-OC₄H₉)₃), bis-iso-butyloxy di-ethyloxy titanium (Ti(OCH₃CH₂)₂(i-OC₄H₉)₂), tri-ethyloxy iso-butyloxy titanium (Ti(OCH₃CH₂)₃(i-OC₄H₉)), tri-n-butyloxy methyloxy titanium (Ti(OCH₃)(OC₄H₉)₃), bis-n-butyloxy di-methyloxy titanium (Ti(OCH₃)₂(OC₄H₉)₂), tri-methyloxy n-butyloxy titanium (Ti(OCH₃)₃(OC₄H₉)), tri-n-butyloxy ethyloxy titanium (Ti(OCH₃CH₂)(OC₄H₉)₃), bis-n-butyloxy di-ethyloxy titanium (Ti(OCH₃CH₂)₂(OC₄H₉)₂), tri-ethyloxy n-butyloxy titanium (Ti(OCH₃CH₂)₃(OC₄H₉)) and the like; tetra-methyloxy zirconium (Zr(OCH₃)₄), tetra-ethyloxy zirconium (Zr(OCH₃CH₂)₄), tetra-iso-butyloxy zirconium (Zr(i-OC₄H₉)₄), tetra-n-butyloxy zirconium (Zr(OC₄H₉)₄), tri-ethyloxy methyloxy zirconium (Zr(OCH₃)(OCH₃CH₂)₃), di-ethyloxy di-methyloxy zirconium (Zr(OCH₃)₂(OCH₃CH₂)₂), tri-methyloxy ethyloxy zirconium (Zr(OCH₃)₃(OCH₃CH₂)), tri-iso-butyloxy methyloxy zirconium(Zr(OCH₃)(i-OC₄H₉)₃), bis-iso-butyloxy di-methyloxy zirconium (Zr(OCH₃)₂(i-OC₄H₉)₂), tri-methyloxy iso-butyloxy zirconium (Zr(OCH₃)₃(i-C₄H₉)), tri-iso-butyloxy ethyloxy zirconium (Zr(OCH₃CH₂)(i-OC₄H₉)₃), bis-iso-butyloxy di-ethyloxy zirconium (Zr(OCH₃CH₂)₂(i-OC₄H₉)₂), tri-ethyloxy iso-butyloxy zirconium (Zr(OCH₃CH₂)₃(i-OC₄H₉)), tri-n-butyloxy methyloxy zirconium (Zr(OCH₃)(OC₄H₉)₃), bis-n-butyloxy di-methyloxy zirconium (Zr(OCH₃)₂(OC₄H₉)₂), tri-methyloxy n-butyloxy zirconium (Zr(OCH₃)₃(OC₄H₉)), tri-n-butyloxy ethyloxy zirconium (Zr(OCH₃CH₂)(OC₄H₉)₃), bis-n-butyloxy di-ethyloxy zirconium (Zr(OCH₃CH₂)₂(OC₄H₉)₂), tri-ethyloxy n-butyloxy zirconium (Zr(OCH₃CH₂)₃(OC₄H₉)) and the like; tetra-methyloxy hafnium (Hf(OCH₃)₄), tetra-ethyloxy hafnium (Hf(OCH₃CH₂)₄), tetra-iso-butyloxy hafnium (Hf(i-OC₄H₉)₄), tetra-n-butyloxy hafnium (Hf(OC₄H₉)₄), tri-ethyloxy methyloxy hafnium (Hf(OCH₃)(OCH₃CH₂)₃), di-ethyloxy di-methyloxy hafnium (Hf(OCH₃)₂(OCH₃CH₂)₂), tri-methyloxy ethyloxy hafnium (Hf(OCH₃)₃(OCH₃CH₂)), tri-iso-butyloxy methyloxy hafnium (Hf(OCH₃)(i-OC₄H₉)₃), bis-iso-butyloxy di-methyloxy hafnium (Hf(OCH₃)₂(i-OC₄H₉)₂), tri-methyloxy iso-butyloxy hafnium (Hf(OCH₃)₃(i-OC₄H₉)), tri-iso-butyloxy ethyloxy hafnium (Hf(OCH₃CH₂)(i-OC₄H₉)₃), bis-iso-butyloxy di-ethyloxy hafnium (Hf(OCH₃CH₂)₂(i-OC₄H₉)₂), tri-ethyloxy iso-butyloxy hafnium (Hf(OCH₃CH₂)₃(i-C₄H₉)), tri-n-butyloxy methyloxy hafnium (Hf(OCH₃)(OC₄H₉)₃), bis-n-butyloxy di-methyloxy hafnium (Hf(OCH₃)₂(OC₄H₉)₂), tri-methyloxy n-butyloxy hafnium (Hf(OCH₃)₃(OC₄H₉)), tri-n-butyloxy ethyloxy hafnium (Hf(OCH₃CH₂)(OC₄H₉)₃), bis-n-butyloxy di-ethyloxy hafnium (Hf(OCH₃CH₂)₂(OC₄H₉)₂), tri-ethyloxy n-butyloxy hafnium (Hf(OCH₃CH₂)₃(OC₄H₉)) and the like.

As said Group IVB metal alkyl halide, for example, the following can be enumerated: trimethyl titanium chloride (TiCl(CH₃)₃), triethyl titanium chloride (TiCl(CH₃CH₂)₃), tri-iso-butyl titanium chloride (TiCl(i-C₄H₉)₃), tri-n-butyl titanium chloride (TiCl(C₄H₉)₃), dimethyl titanium dichloride (TiCl₂(CH₃)₂), diethyl titanium dichloride (TiCl₂(CH₃CH₂)₂), bis-iso-butyl titanium dichloride (TiCl₂(i-C₄H₉)₂), tri-n-butyl titanium chloride (TiCl(C₄H₉)₃), methyl titanium trichloride (Ti(CH₃)Cl₃), ethyl titanium trichloride (Ti(CH₃CH₂)Cl₃), iso-butyl titanium trichloride (Ti(i-C₄H₉)Cl₃), n-butyl titanium trichloride (Ti(C₄H₉)Cl₃); trimethyl titanium bromide (TiBr(CH₃)₃), triethyl titanium bromide (TiBr(CH₃CH₂)₃), tri-iso-butyl titanium bromide (TiBr(i-C₄H₉)₃), tri-n-butyl titanium bromide (TiBr(C₄H₉)₃), dimethyl titanium dibromide (TiBr₂(CH₃)₂), diethyl titanium dibromide (TiBr₂(CH₃CH₂)₂), bis-iso-butyl titanium dibromide (TiBr₂(i-C₄H₉)₂), tri-n-butyl titanium bromide (TiBr(C₄H₉)₃), methyl titanium tribromide (Ti(CH₃)Br₃), ethyl titanium tribromide (Ti(CH₃CH₂)Br₃), iso-butyl titanium tribromide (Ti(i-C₄H₉)Br₃), n-butyl titanium tribromide (Ti(C₄H₉)Br₃); trimethyl zirconium chloride (ZrCl(CH₃)₃), triethyl zirconium chloride (ZrCl(CH₃CH₂)₃), tri-iso-butyl zirconium chloride (ZrCl(i-C₄H₉)₃), tri-n-butyl zirconium chloride (ZrCl(C₄H₉)₃), dimethyl zirconium dichloride (ZrCl₂(CH₃)₂), diethyl zirconium dichloride (ZrCl₂(CH₃CH₂)₂), bis-iso-butyl zirconium dichloride (ZrCl₂(i-C₄H₉)₂), tri-n-butyl zirconium chloride (ZrCl(C₄H₉)₃), methyl zirconium trichloride (Zr(CH₃)Cl₃), ethyl zirconium trichloride (Zr(CH₃CH₂)Cl₃), iso-butyl zirconium trichloride (Zr(i-C₄H₉)Cl₃), n-butyl zirconium trichloride (Zr(C₄H₉)Cl₃); trimethyl zirconium bromide (ZrBr(CH₃)₃), triethyl zirconium bromide (ZrBr(CH₃CH₂)₃), tri-iso-butyl zirconium bromide (ZrBr(i-C₄H₉)₃), tri-n-butyl zirconium bromide (ZrBr(C₄H₉)₃), dimethyl zirconium dibromide (ZrBr₂(CH₃)₂), diethyl zirconium dibromide (ZrBr₂(CH₃CH₂)₂), bis-iso-butyl zirconium dibromide (ZrBr₂(i-C₄H₉)₂), tri-n-butyl zirconium bromide (ZrBr(C₄H₉)₃), methyl zirconium tribromide (Zr(CH₃)Br₃), ethyl zirconium tribromide (Zr(CH₃CH₂)Br₃), iso-butyl zirconium tribromide (Zr(i-C₄H₉)Br₃), n-butyl zirconium tribromide (Zr(C₄H₉)Br₃); trimethyl hafnium chloride (HfCl(CH₃)₃), triethyl hafnium chloride (HfCl(CH₃CH₂)₃), tri-iso-butyl hafnium chloride (HfCl(i-C₄H₉)₃), tri-n-butyl hafnium chloride (HfCl(C₄H₉)₃), dimethyl hafnium dichloride (HfCl₂(CH₃)₂), diethyl hafnium dichloride (HfCl₂(CH₃CH₂)₂), bis-iso-butyl hafnium dichloride (HfCl₂(i-C₄H₉)₂), tri-n-butyl hafnium chloride (HfCl(C₄H₉)₃), methyl hafnium trichloride (Hf(CH₃)Cl₃), ethyl hafnium trichloride (Hf(CH₃CH₂)Cl₃), iso-butyl hafnium trichloride (Hf(i-C₄H₉)Cl₃), n-butyl hafnium trichloride (Hf(C₄H₉)Cl₃);trimethyl hafnium bromide (HfBr(CH₃)₃), triethyl hafnium bromide (HfBr(CH₃CH₂)₃), tri-iso-butyl hafnium bromide (HfBr(i-C₄H₉)₃), tri-n-butyl hafnium bromide (HfBr(C₄H₉)₃), dimethyl hafnium dibromide (HfBr₂(CH₃)₂), diethyl hafnium dibromide (HfBr₂(CH₃CH₂)₂), bis-iso-butyl hafnium dibromide (HfBr₂(i-C₄H₉)₂), tri-n-butyl hafnium bromide (HfBr(C₄H₉)₃), methyl hafnium tribromide (Hf(CH₃)Br₃), ethyl hafnium tribromide (Hf(CH₃CH₂)Br₃), iso-butyl hafnium tribromide (Hf(i-C₄H₉)Br₃), n-butyl hafnium tribromide (Hf(C₄H₉)Br₃).

As said Group IVB metal alkoxy halide, for example, the following can be enumerated: tri-methyloxy titanium chloride (TiCl(OCH₃)₃), tri-ethyloxy titanium chloride (TiCl(OCH₃CH₂)₃), tri-iso-butyloxy titanium chloride (TiCl(i-OC₄H₉)₃), tri-n-butyloxy titanium chloride (TiCl(OC₄H₉)₃), di-methyloxy titanium dichloride (TiCl₂(OCH₃)₂), di-ethyloxy titanium dichloride (TiCl₂ (OCH₃CH₂)₂), bis-iso-butyloxy titanium dichloride (TiCl₂(i-OC₄H₉)₂), tri-n-butyloxy titanium chloride (TiCl(OC₄H₉)₃), methyloxy titanium trichloride (Ti(OCH₃)Cl₃), ethyloxy titanium trichloride (Ti(OCH₃CH₂)Cl₃), iso-butyloxy titanium trichloride (Ti(i-C₄H₉)Cl₃), n-butyloxy titanium trichloride (Ti(OC₄H₉)Cl₃); tri-methyloxy titanium bromide (TiBr(OCH₃)₃), tri-ethyloxy titanium bromide (TiBr(OCH₃CH₂)₃), tri-iso-butyloxy titanium bromide (TiBr(i-OC₄H₉)₃), tri-n-butyloxy titanium bromide (TiBr(OC₄H₉)₃), di-methyloxy titanium dibromide (TiBr₂(OCH₃)₂), di-ethyloxy titanium dibromide (TiBr₂(OCH₃CH₂)₂), bis-iso-butyloxy titanium dibromide (TiBr₂(i-OC₄H₉)₂), tri-n-butyloxy titanium bromide (TiBr(OC₄H₉)₃), methyloxy titanium tribromide (Ti(OCH₃)Br₃), ethyloxy titanium tribromide (Ti(OCH₃CH₂)Br₃), iso-butyloxy titanium tribromide (Ti(i-C₄H₉)Br₃), n-butyloxy titanium tribromide (Ti(OC₄H₉)Br₃); tri-methyloxy zirconium chloride (ZrCl(OCH₃)₃), tri-ethyloxy zirconium chloride (ZrCl(OCH₃CH₂)₃), tri-iso-butyloxy zirconium chloride (ZrCl(i-OC₄H₉)₃), tri-n-butyloxy zirconium chloride (ZrCl(OC₄H₉)₃), di-methyloxy zirconium dichloride (ZrCl₂(OCH₃)₂), di-ethyloxy zirconium dichloride (ZrCl₂(OCH₃CH₂)₂), bis-iso-butyloxy zirconium dichloride (ZrCl₂(i-OC₄H₉)₂), tri-n-butyloxy zirconium chloride (ZrCl(OC₄H₉)₃), methyloxy zirconium trichloride (Zr(OCH₃)Cl₃), ethyloxy zirconium trichloride (Zr(OCH₃CH₂)Cl₃), iso-butyloxy zirconium trichloride (Zr(i-C₄H₉)Cl₃), n-butyloxy zirconium trichloride (Zr(OC₄H₉)Cl₃); tri-methyloxy zirconium bromide (ZrBr(OCH₃)₃), tri-ethyloxy zirconium bromide(ZrBr(OCH₃CH₂)₃), tri-iso-butyloxy zirconium bromide (ZrBr(i-OC₄H₉)₃), tri-n-butyloxy zirconium bromide (ZrBr(OC₄H₉)₃), di-methyloxy zirconium dibromide (ZrBr₂(OCH₃)₂), di-ethyloxy zirconium dibromide (ZrBr₂(OCH₃CH₂)₂), bis-iso-butyloxy zirconium dibromide (ZrBr₂(i-OC₄H₉)₂), tri-n-butyloxy zirconium bromide (ZrBr(OC₄H₉)₃), methyloxy zirconium tribromide (Zr(OCH₃)Br₃), ethyloxy zirconium tribromide (Zr(OCH₃CH₂)Br₃), iso-butyloxy zirconium tribromide (Zr(i-C₄H₉)Br₃), n-butyloxy zirconium tribromide (Zr(OC₄H₉)Br₃); tri-methyloxy hafnium chloride (HfCl(OCH₃)₃), tri-ethyloxy hafnium chloride (HfCl(OCH₃CH₂)₃), tri-iso-butyloxy hafnium chloride (HfCl(i-OC₄H₉)₃), tri-n-butyloxy hafnium chloride (HfCl(OC₄H₉)₃), di-methyloxy hafnium dichloride (HfCl₂(OCH₃)₂), di-ethyloxy hafnium dichloride (HfCl₂(OCH₃CH₂)₂), bis-iso-butyloxy hafnium dichloride (HfCl₂(i-OC₄H₉)₂), tri-n-butyloxy hafnium chloride (HfCl(OC₄H₉)₃), methyloxy hafnium trichloride (Hf(OCH₃)Cl₃), ethyloxy hafnium trichloride (Hf(OCH₃CH₂)Cl₃), iso-butyloxy hafnium trichloride (Hf(i-C₄H₉)Cl₃), n-butyloxy hafnium trichloride (Hf(OC₄H₉)Cl₃); tri-methyloxy hafnium bromide (HfBr(OCH₃)₃), tri-ethyloxy hafnium bromide (HfBr(OCH₃CH₂)₃), tri-iso-butyloxy hafnium bromide (HfBr(i-OC₄H₉)₃), tri-n-butyloxy hafnium bromide (HfBr(OC₄H₉)₃), di-methyloxy hafnium dibromide (HfBr₂(OCH₃)₂), di-ethyloxy hafnium dibromide (HfBr₂(OCH₃CH₂)₂), bis-iso-butyloxy hafnium dibromide (HfBr₂(i-OC₄H₉)₂), tri-n-butyloxy hafnium bromide (HfBr(OC₄H₉)₃), methyloxy hafnium tribromide (Hf(OCH₃)Br₃), ethyloxy hafnium tribromide (Hf(OCH₃CH₂)Br₃), iso-butyloxy hafnium tribromide (Hf(i-C₄H₉)Br₃), n-butyloxy hafnium tribromide (Hf(OC₄H₉)Br₃).

As said Group IVB metal compound, said Group IVB metal halide is preferable, TiCl₄, TiBr₄, ZrCl₄, ZrBr₄, HfCl₄ and HfBr₄ are more preferable, and TiCl₄ and ZrCl₄ are most preferable.

These Group IVB metal compounds can be used alone or in combination at any proportion.

When the chemical treating agent is liquid at room temperature, the chemical treating agent can be directly used to perform said chemical treatment reaction. When the chemical treating agent is solid at normal temperature, it is preferred to use the chemical treating agent in solution form for ease of measurement and operation. Of course, when the chemical treating agent is liquid at room temperature, the chemical treating agent can sometimes be used in solution form as needed, without special limitations.

When preparing a solution of the chemical treating agent, there is no special limitation on the solvent used at this time, as long as it can dissolve the chemical treating agent and does not damage (for example dissolve) the existing support structure of the composite support.

Specifically, C_5-12 alkane, C_5-12 cycloalkane, halogenated C_5-12 alkane, halogenated C_5-12 cycloalkane, and the like can be enumerated. For example, pentane, hexane, heptane, octane, nonane, decane, undecane, dodecane, cyclopentane, cyclohexane, cycloheptane, cyclooctane, chloropentane, chlorohexane, chloroheptane, chlorooctane, chlorononane, chlorodecane, chloroundecane, chlorododecane, chlorocyclohexane and the like can be enumerated, wherein pentane, hexane, decane and cyclohexane are preferable, and hexane is most preferable.

These solvents can be used alone or in combination at any proportion.

In addition, there is no special limit on the concentration of the chemical treating agent in its solution, and it can be appropriately selected as required, as long as it can achieve the chemical treatment reaction with a predetermined amount of the chemical treating agent. As mentioned earlier, if the chemical treating agent is liquid, the chemical treating agent can be directly used to perform the treatment, but it can also be formulated into a chemical treating agent solution and used.

Generally speaking, the molar concentration of the chemical treating agent in its solution is generally set at 0.01-1.0 mol/L, but not limited thereto.

According to the present invention, as the manner of performing the chemical treatment reaction, for example, a process of contacting the composite support with the chemical treating agent in the presence of a solvent (also known as a chemical treatment solvent) can be enumerated.

According to the present invention, there is no special limitation on the chemical treatment solvent, as long as it can dissolve the chemical treating agent and does not damage (for example dissolve) the existing support structure of the composite support.

Specifically, as said chemical treatment solvent, C_5-12 alkane, C_5-12 cycloalkane, halogenated C_5-12 alkane, halogenated C_5-12 cycloalkane, and the like can be enumerated. For example, pentane, hexane, heptane, octane, nonane, decane, undecane, dodecane, cyclopentane, cyclohexane, cycloheptane, cyclooctane, chloropentane, chlorohexane, chloroheptane, chlorooctane, chlorononane, chlorodecane, chloroundecane, chlorododecane, chlorocyclohexane and the like can be enumerated, wherein pentane, hexane, decane and cyclohexane are preferable, and hexane is most preferable.

These solvents can be used alone or in combination at any proportion.

According to the present invention, the chemical treatment solvent is used in such an amount that the ratio of the composite support to the chemical treatment solvent is 1 g:1-100 mL, preferably 1 g:2-40 mL, but not limited thereto in some cases. In addition, when using the chemical treating agent in the form of solution as mentioned earlier, the used amount of the chemical treatment solvent can be appropriately reduced according to the actual situation without any special limitation.

According to the present invention, the chemical treating agent is used in such an amount that the molar ratio of the composite support (as the magnesium element) to the chemical treating agent (as the Group IVB metal element) reaches 1:0.01-1, preferably 1:0.01-0.50, more preferably 1:0.10-0.30.

According to one embodiment of the present invention, in the presence of the chemical treatment solvent, the composite support is contacted with the chemical treating agent to perform the chemical treatment reaction.

As the manner of the contacting, for example, the following can be enumerated: the composite support is added to the chemical treatment solvent under stirring, and the chemical treating agent or the chemical treating agent solution can be added simultaneously or subsequently (preferably dropwise), and after the addition is completed, the reaction under stirring can be continued at 0-100° C. (preferably 20-80° C.). There is no specific limitation on the reaction time at this time, for example, 0.5-8 hours, preferably 1-4 hours can be enumerated.

After the chemical treatment reaction is completed, the product that has undergone the chemical treatment (the modified composite support) can be obtained through filtering, washing, and drying.

According to the present invention, the filtering, washing, and drying can be carried out according to the conventional processes, wherein the washing solvent can be the same solvent as used for the chemical treatment. As required, the washing is generally performed 1-8 times, preferably 2-6 times, and most preferably 2-4 times.

The drying can be performed by using conventional processes, e.g. inert gas drying, drying in vacuum or heating and drying in vacuum, preferably inert gas drying or heating and drying in vacuum, most preferably heating and drying in vacuum. The drying temperature range is generally from normal temperature to 140° C., the drying time is generally 2-20 hours, but not limited thereto.

According to the present invention, a non-metallocene complex is contacted with the modified composite support in the presence of a second solvent to obtain the supported non-metallocene catalyst.

According to the present invention, the term “non-metallocene complex”, as opposed to metallocene catalysts, refers to a single center olefin polymerization catalyst that does not contain cyclopentadienyl groups or their derivatives such as cyclopentadiene ring, fluorene ring, indene rings, and the like in its structure, and is a metal organic compound that can exhibit the olefin polymerization catalytic activity when combined with a cocatalyst (such as those described below) (therefore, the non-metallocene complexe is sometimes referred to as the non-metallocene olefin polymerization-like complex). The compound contains a center metal atom and at least one multidentate ligand (preferably a tridentate ligand or a polydentate (higher than tridentate) ligand) bound by a coordination bond with the center metal atom, and the term “non-metallocene ligand” is the above-mentioned multidentate ligand.

According to the present invention, the non-metallocene complex is selected from a compound with the following chemical structural formula:

According to this chemical structural formula, the ligand that forms a coordination bond with the center metal atom M includes n groups X and in multidentate ligands (the structural formula in the parenthesis). According to the chemical structural formula of the multidentate ligand, groups A, D, and E (coordination groups) form coordination bonds with the center metal atom M through the coordination atoms contained in these groups (heteroatoms such as N, O, S, Se, and P). In the present invention, the center metal atom M is also known as the active metal, and the amount of the catalyst is usually represented by the amount of the center metal atom M in the non-metallocene complex.

According to the present invention, the absolute value of the total negative charge carried by all ligands (including the groups X and the multidentate ligands) is identical to the absolute value of the positive charge carried by the central metal atom M.

In a more specific embodiment, the non-metallocene complex is selected from compounds (A) and (B) with the following chemical structural formulae.

In a more specific embodiment, the non-metallocene complex is selected from compound (A-1) to compound (A-4) and compound (B-1) to compound (B-4) with the following chemical structural formulae:

in all the above chemical structural formulae, q is 0 or 1; d is 0 or 1; m is 1, 2 or 3; M is the center metal atom selected from metal atoms of Group III To Group XI in the Periodic Table of Elements, preferably metal atoms of Group IVB. For example, Ti (IV), Zr (IV), Hf (IV), Cr (III), Fe (III), Ni (II), Pd (II) or Co (II), can be enumerated; n is 1, 2, 3 or 4, depending on the valence state of the central metal atom M; X is selected from a halogen atom, a hydrogen atom, a C₁-C₃₀ hydrocabon group, a substituted C₁-C₃₀ hydrocabon group, an oxygen-containing group, a nitrogen-containing group, a sulfur-containing group, a boron-containing group, an aluminum-containing group, a phosphorus-containing group, a silicon-containing group, a germanium-containing group or a stannum-containing group, a plurality of Xs can be identical or different, and can also form a bond or a ring with each other; A is selected from an oxygen atom, a sulphur atom, a selenium atom,

—NR²³R²⁴, —N(O)R²⁵R²⁶,

—PR²⁸R²⁹, —P(O)R³⁰R³¹, sulfonyl, sulfinyl or —Se(O)R³⁹, wherein N, O, S, Se, and P are each coordination atoms; B is selected from a nitrogen atom, a nitrogen-containing group, a phosphorus-containing group or a C₁-C₃₀ hydrocabon group; D is selected from a nitrogen atom, an oxygen atom, a sulphur atom, a selenium atom, a phosphorus atom, a nitrogen-containing group, a phosphorus-containing group, a C₁-C₃₀ hydrocabon group, sulfonyl or sulfinyl, wherein N, O, S, Se, and P are each coordination atoms; E is selected from a nitrogen-containing group, an oxygen-containing group, a sulfur-containing group, a selenium-containing group, a phosphorus-containing group or cyano (—CN), wherein N, O, S, Se, and P are each coordination atoms; F is selected from a nitrogen atom, a nitrogen-containing group, an oxygen atom, a sulphur atom, a selenium atom, or a phosphorus-containing group, wherein N, O, S, Se, and P are each coordination atoms; G is selected from a C₁-C₃₀ hydrocabon group, a substituted C₁-C₃₀ hydrocabon group or an inert functional group; Y is selected from an oxygen atom, a nitrogen-containing group, an oxygen-containing group, a sulfur-containing group, a selenium-containing group or a phosphorus-containing group, wherein N, O, S, Se, and P are each coordination atoms; Z is selected from a nitrogen-containing group, an oxygen-containing group, a sulfur-containing group, a selenium-containing group, a phosphorus-containing group or cyano (—CN), for example, —NR²³R²⁴, —N(O)R²⁵R²⁶, —PR²⁸R²⁹, —P(O)R³⁰R³¹, —OR³⁴, —SR³⁵, —S(O)R³⁶, —SeR³⁸ or —Se(O)R³⁹ can be enumerated, wherein N, O, S, Se, and P are each coordination atoms; → represents a single bond or a double bond; — represents a covalent bond or an ionic bond; represents a coordination bond, a covalent bond or an ionic bond.

R¹ to R⁴ and R⁶ to R²¹ are each independently selected from hydrogen, a C₁-C₃₀ hydrocabon group, a substituted C₁-C₃₀ hydrocabon group (wherein preferably a halohydrocabon group, for example —CH₂Cl and —CH₂CH₂Cl) or an inert functional group. R²² to R³⁶, R³⁸ and R³⁹ are each independently selected from hydrogen, a C₁-C₃₀ hydrocabon group or a substituted C₁-C₃₀ hydrocabon group (wherein preferably a halohydrocabon group, for example —CH₂Cl and —CH₂CH₂Cl). The above-mentioned groups can be identical to or different from each other, wherein adjacent groups for example R¹ and R², R⁶ and R⁷, R⁷ and R⁸, R⁸ and R⁹, R¹³ and R¹⁴, R¹⁴ and R¹⁵, R¹⁵ and R¹⁶, R¹⁸ and R¹⁹, R¹⁹ and R²⁰, R²⁰ and R²¹, R²³ and R²⁴, R²⁵ and R²⁶, or the like can bind to each other to form a bond or to form a ring, preferably form an aromatic ring, for example an unsubstituted benzene ring or a benzene ring substituted by 1 -4 substituents selected from a C₁-C₃₀ hydrocabon group or a substituted C₁-C₃₀ hydrocabon group (wherein preferably a halohydrocabon group, for example —CH₂Cl and —CH₂CH₂Cl), and R⁵ is selected from a lone pair of electrons on the nitrogen, a hydrogen atom, a C₁-C₃₀ hydrocabon group, a substituted C₁-C₃₀ hydrocabon group, an oxygen-containing group, a sulfur-containing group, a nitrogen-containing group, a selenium-containing group or a phosphorus-containing group. When R⁵ is an oxygen-containing group, a sulfur-containing group, a nitrogen-containing group, a selenium-containing group or a phosphorus-containing group, N, O, S, P and Se in R⁵ can serve as coordination atoms (coordinating with the center metal atom M).

In the context of the present invention, said inert functional group that for example can be enumerated is selected from at least one of halogen, an oxygen-containing group, a nitrogen-containing group, a silicon-containing group, a germanium-containing group, a sulfur-containing group, a stannum-containing group, a C₁-C₁₀ ester group, nitro (—NO₂), or the like, but usually excluding a C₁-C₃₀ hydrocabon group and a substituted C₁-C₃₀ hydrocabon group.

In the context of the present invention, subject to the chemical structure of the multidentate ligand, the inert functional group has the following characteristics: (1) Not interfering with the coordination process between the group A, D, E, F, Y, or Z and the center metal atom M, and (2) The coordination ability with the center metal atom M being lower than that of the groups A, D, E, F, Y, and Z, and not replacing the existing coordination between these groups and the center metal atom M.

According to the present invention, in all the aforementioned chemical structural formulae, depending on the specific situations, any adjacent two or more groups, such as R²¹ and group Z, or R¹³ and group Y, can combine with each other to form a ring, preferably to form a C₆-C₃₀ aromatic heterocycle containing a heteroatom from the group Z or Y, e.g. a pyridine ring and the like, wherein the aromatic heterocycle is optionally substituted by one or more substituents selected from a C₁-C₃₀ hydrocarbon group and a substituted C₁-C₃₀ hydrocarbon group.

In the context of the present invention, said halogen is selected from F, Cl, Br or I. Said nitrogen-containing group is selected from

—NR²³R²⁴, —T—NR²³R²⁴ or —N(O)R²⁵R²⁶. Said phosphorus-containing group is selected from

—PR²⁸R²⁹, —P(O)R³⁰R³¹ or —P(O)R³²(OR³³). Said oxygen-containing group is selected from hydroxy, —OR³⁴ and —T—OR³⁴. Said sulfur-containing group is selected from —SR³⁵, —T—SR³⁵, —S(O)R³⁶ or —T—SO₂R³⁷. Said selenium-containing group is selected from —SeR³⁸, —T—SeR³⁸, —Se(O)R³⁹ or —T—Se(O)R³⁹. Said group T is selected from a C₁-C₃₀ hydrocabon group or a substituted C₁-C₃₀ hydrocabon group. Said R³⁷ is selected from hydrogen, a C₁-C₃₀ hydrocabon group or a substituted C₁-C₃₀ hydrocabon group.

In the context of the present invention, said C₁-C₃₀ hydrocabon group is selected from C₁-C₃₀ alkyl (preferably C₁-C₆ alkyl, for example isobutyl), C₇-C₃₀ alkylaryl (for example tolyl, dimethylphenyl, diisobutylphenyl or the like), C₇-C₃₀ arylalkyl (for example benzyl), C₃-C₃₀ cyclic alkyl group, C₂-C₃₀ alkenyl, C₂-C₃₀ alkynyl, C₆-C₃₀ aryl (for example phenyl, naphthyl, anthracyl or the like), C₈-C₃₀ fused ring group or C₄-C₃₀ heterocyclic group, wherein said heterocyclic group contains 1-3 heteroatoms selected from a nitrogen atom, an oxygen atom or a sulphur atom, for example pyridyl, pyrrolyl, furyl, thienyl or the like.

According to the present invention, in the context of the present invention, said C₁-C₃₀ hydrocarbon group sometimes refers to the C₁-C₃₀ hydrocarbon diyl (divalent group, or referred to as the C₁-C₃₀ hydrocarbylene group) or C₁-C₃₀ hydrocarbon triyl (trivalent group), depending on the specific situation of the related group it is combined with, which is obvious to those skilled in the art.

In the context of the present invention, the substituted C₁-C₃₀ hydrocabon group refers to a C₁-C₃₀ hydrocarbon group with one or more inert substituents. The so-called inert substituent refers to those substituents that do not substantially interfere with the coordination process between the aforementioned coordination groups (referring to groups A, D, E, F, Y, and Z, or optionally including group R⁵) and the center metal atom M; in other words, due to the limitation by the chemical structure of the multidentate ligand described in the present invention, these substituents have no ability or opportunity (e.g. being affected by steric hindrance) to undergo a coordination reaction with the center metal atom M to form a coordination bond. Generally speaking, the inert substituent is selected from halogen or C₁-C₃₀ alkyl (preferably C₁-C₆ alkyl, such as isobutyl).

In the context of the present invention, said boron-containing group is selected from BF₄⁻, (C₆F₅)B⁻ or (R⁴⁰BAr₃)⁻; said aluminum-containing group is selected from alkyl aluminum, AlPh₄⁻, AlF₄⁻, AlCl₄⁻, AlBr₄⁻, AlI₄⁻ or R⁴¹AlAr₃⁻; said silicon-containing group is selected from —SiR⁴²R⁴³R⁴⁴ or —T—SiR⁴⁵; said germanium-containing group is selected from —GeR⁴⁶R⁴⁷R⁴⁸ or —T—GeR⁴⁹; said stannum-containing group is selected from —SnR⁵⁰R⁵¹R⁵², —T—SnR⁵³ or —T—Sn(O)R⁵⁴, wherein Ar represents C₆-C₃₀ aryl. R⁴⁰ to R⁵⁴ are each independently selected from hydrogen, the above-mentioned C₁-C₃₀ hydrocarbon group, or the above-mentioned substituted C₁-C₃₀ hydrocarbon group. The above-mentioned groups can be identical to or different from each other, wherein adjacent groups can be combined together with each other to form a bond or to form a ring, wherein, group T is defined as before.

As the non-metallocene complex, for example, the following compounds can be enumerated:

The non-metallocene complex is preferably selected from the following compounds:

The non-metallocene complex is further preferably selected from the following compounds:

The non-metallocene complex is more preferably selected from the following compounds:

These non-metallocene complexes can be used alone or in combination at any proportion.

According to the present invention, the multidentate ligand in the non-metallocene complex is not a diethyl compound conventionally used as an electron donor compound in the art.

The non-metallocene complex or the multidentate ligand can be prepared according to any process known to those skilled in the art. For specific contents of the preparation process, see, for example, WO03/010207 and Chinese patents ZL01126323.7 and ZL02110844.7, and the like, which are incorporated herein by reference in their entirety.

According to the present invention, for the convenience of metering and operation, the non-metallocene complex is used in solution form when necessary.

When preparing a solution of said non-metallocene complex, there is no special limit on the solvent used at this time, as long as it can dissolve said non-metallocene complex. As said solvent, for example, one or more of C_6-12 aromatic hydrocarbon, halogenated C_6-12 aromatic hydrocarbon, halogenated C_1-10 alkane, ester and ether can be enumerated. Specifically, for example, toluene, xylene, trimethylbenzene, ethylbenzene, di-ethylbenzene, chlorotoluene, chloroethylbenzene, bromotoluene, bromoethylbenzene, dichloromethane, dichloroethane, ethyl acetate, tetrahydrofuran, and the like can be enumerated. Among them, C_6-12 aromatic hydrocarbon, dichloromethane and tetrahydrofuran are preferable.

These solvents can be used alone or in combination at any proportion.

In case of dissolving the non-metallocene complex, stirring can be used as required (the stirring rotation speed is generally 10-500 rpm).

According to the present invention, it is convenient that the ratio of the non-metallocene complex to the solvent is generally 0.02-0.30 g/mL, preferably 0.05-0.15 g/mL, but not limited thereto in some cases.

As the way of contacting the non-metallocene complex with the modified composite support in the presence of a second solvent, for example, the following processes can be enumerated.

Firstly, the modified composite support and the non-metallocene complex are contacted (reacted by contacting) in the presence the second solvent to obtain a second mixed slurry.

During the preparation of the second mixed slurry, there is no special limitation on the contact mode and the contact order between the modified composite support and the non-metallocene complex (as well as the second solvent). For example, the following can be enumerated: the modified composite support and the non-metallocene complex are first mixed, and then the second solvent is added to the resulting mixture; alternatively, the non-metallocene complex is dissolved in the second solvent to produce a non-metallocene complex solution, and then the modified composite support and the non-metallocene complex solution are mixed, wherein the latter is preferable.

In addition, in order to prepare the second mixed slurry, for example, the reaction by contacting between the modified composite support and the non-metallocene complex in the presence of the second solvent can be carried out at a temperature in the range from normal temperature to a temperature that is below the boiling point of any of the used solvents (with stirring if necessary) for 0.5-24 hours, preferably 1-8 hours, more preferably 2-6 hours.

At this point, the obtained second mixed slurry is a slurry-like system. Although it is not necessary, in order to ensure the uniformity of the system, the second mixed slurry is preferably placed in a sealed state for a certain period of time (2-48 hours, preferably 4-24 hours, most preferably 6-18 hours) after the preparation.

According to the present invention, there is no special limitation on the second solvent (hereinafter sometimes referred to as a solvent for dissolving the non-metallocene complex) during the preparation of the second mixed slurry or during the contacting, as long as it can dissolve the non-metallocene complex.

As the second solvent, for example, one or more of C_6-12 aromatic hydrocarbon, halogenated C_6-12 aromatic hydrocarbon, C_5-12 alkane, halogenated C_1-10 alkane and ether can be enumerated. Specifically, for example toluene, xylene, trimethylbenzene, ethylbenzene, di-ethylbenzene, chlorotoluene, chloroethylbenzene, bromotoluene, bromoethylbenzene, hexane, dichloromethane, dichloroethane, tetrahydrofuran and the like can be enumerated. Among them, C_6-12 aromatic hydrocarbon, dichloromethane and tetrahydrofuran are preferable, and dichloromethane is most preferable.

These solvents can be used alone or in combination at any proportion.

During the preparation of the second mixed slurry or the non-metallocene complex solution, stirring can be used as required (the stirring rotation speed is generally 10-500 rpm).

According to the present invention, there is no limitation on the used amount of the second solvent, as long as it is such an amount sufficient to achieve the adequate contact between the modified composite support and the non-metallocene complex. For example, it is convenient that the ratio of the non-metallocene complex to the second solvent is generally 0.01-0.25 g/mL, preferably 0.05-0.16 g/mL, but not limited thereto in some cases.

In one embodiment of the present invention, a solid product with good flowability can be obtained by directly drying the second mixed slurry, and it is a supported non-metallocene catalyst of the present invention.

In one embodiment of the present invention, it is unnecessary to dry the second mixed slurry, which can be directly used as the supported non-metallocene catalyst.

At this point, the direct drying can be carried out by using conventional processes, e.g. drying in an inert gas atmosphere, drying in vacuum, heating and drying in vacuum, or the like, wherein heating and drying in vacuum is preferable. The drying is generally carried out at a temperature of 5-15° C. lower than the boiling point of any solvent contained in the mixed slurry (generally 30-160° C., preferably 60-130° C.), and the drying time is generally 2-24 hours, but not limited thereto in some cases.

According to the present invention, the first solvent is used in such an amount that the ratio of the magnesium compound to the first solvent is 1 mol:75-400 mL, preferably 1 mol:150-300 mL, more preferably 1 mol:200-250 mL.

According to the present invention, the alcohol is used in such an amount that the molar ratio of the magnesium compound as the Mg element to the alcohol is 1:0.02-4.00, preferably 1:0.05-3.00, more preferably 1:0.10-2.50.

According to the present invention, the porous support is used in such an amount that the mass ratio of the magnesium compound as the magnesium compound solid to the porous support is 1:0.1-20, preferably 1:0.5-10, more preferably 1:1-5.

According to the present invention, the precipitating agent is used in such an amount that the volume ratio of the precipitating agent to the first solvent is 1:0.2-5, preferably 1:0.5-2, more preferably 1:0.8-1.5.

According to the present invention, the chemical treating agent is used in such an amount that the molar ratio of the composite support as the Mg element to the chemical treating agent as the Group IVB metal element is 1:0.01-1, preferably 1:0.01-0.50, more preferably 1:0.10-0.30.

According to the present invention, the non-metallocene complex is used in such an amount that the molar ratio of the composite support as the Mg element to the non-metallocene complex is 1:0.01-1, preferably 1:0.04-0.4, more preferably 1:0.08-0.2.

Those skilled in the art are aware that all the aforementioned process steps are preferably carried out under essentially anhydrous and oxygen-free conditions. “Essentially anhydrous and oxygen-free” as mentioned herein refers to the contents of water and oxygen in the system are continuously less than 100 ppm. Moreover, the supported non-metallocene catalyst of the present invention after the preparation usually needs to be stored for backup in the presence of a micro positive-pressure inert gas (e.g. nitrogen gas, argon gas, helium gas, and the like) under a sealed condition.

In the present invention, unless otherwise specified, the amount of the supported non-metallocene catalyst is expressed as the amount of the Group IVB active metal element.

According to the present invention, the cocatalyst is selected from aluminoxane, alkyl aluminum, haloalkyl aluminum, and mixtures thereof.

For said aluminoxane, for example, a linear aluminoxane represented by the following general formula (III-1) and a cyclic aluminoxane represented by the following general formula (III-2).

In the aforementioned general formulae, the groups R are identical to or different from (preferably identical to) each other, and each independently selected from C₁-C₈ alkyl, preferably methyl, ethyl, propyl, butyl, and isobutyl, most preferably methyl; n is any integer in the range of 1 -50, preferably any integer in the range of 10-30.

As said aluminoxane, methyl aluminoxane, ethyl aluminoxane, iso-butyl aluminoxane and n-butyl aluminoxane are preferable; methyl aluminoxane and iso-butyl aluminoxane are further preferable, and methyl aluminoxane is most preferable.

These aluminoxanes can be used alone or in combination at any proportion. As said alkyl aluminum, for example, a compound represented by the following general formula (III) can be enumerated:

Al(R)₃   (III)

wherein, groups R are identical to or different from (preferably identical to) each other, and are each independently selected from C₁-C₈ alkyl, preferably methyl, ethyl, propyl, butyl and iso-butyl, most preferably methyl.

Specifically, as said alkyl aluminum, for example, the following can be enumerated: trimethyl aluminum (Al(CH₃)₃), triethyl aluminum (Al(CH₃CH₂)₃), tri-n-propyl aluminum (AlC₃H₇)₃), tri-iso-propyl aluminum (Al(i-C₃H₇)₃), tri-iso-butyl aluminum (Al(i-C₄H₉)₃), tri-n-butyl aluminum (Al(C₄H₉)₃), tri-iso-pentyl aluminum (Al(i-C₅H₁₁)₃), tri-n-pentyl aluminum (Al(C₅H₁₁)₃), tri-n-hexyl aluminum (Al(C₆H₁₃)₃), tri-iso-hexyl aluminum (Al(i-C₆H₁₃)₃), diethyl methyl aluminum (Al(CH₃)(CH₃CH₂)₂) and dimethyl ethyl aluminum (Al(CH₃CH₂) (CH₃)₂) and the like, wherein trimethyl aluminum, triethyl aluminum, tri-propyl aluminum and tri-iso-butyl aluminum are preferable, triethyl aluminum and tri-iso-butyl aluminum are most preferable.

These alkyl aluminums can be used alone or in combination at any proportion. As said haloalkyl aluminum, for example, a compound represented by the following general formula (III′) can be enumerated:

Al(R)_nX_3-n   (III′)

wherein, groups R are identical to or different from (preferably identical to) each other, and are each independently selected from C₁-C₈ alkyl, preferably methyl, ethyl, propyl, butyl and iso-butyl, most preferably methyl; X represents F, Cl, Br, or I; n represents 1 or 2.

Specifically, as the haloalkyl aluminum, for example, the following can be enumerated: monochlorodimethylaluminum (Al(CH₃)₂Cl), dichloromethylaluminum (Al(CH₃)Cl₂), monochlorodiethylaluminum (Al(CH₃CH₂)₂Cl), dichloroethylaluminum (Al(CH₃CH₂)Cl₂), monochlorodipropylaluminum (AlC₃H₇)₂Cl), dichloropropylaluminum (AlC₃H₇)Cl₂)), monochlorodi-n-butylaluminum (Al(C₄H₉)₂Cl), dichloro-n-butylaluminum (Al(C₄H₉)Cl₂), monochlorodiisobutylaluminum (Al(i-C₄H₉)₂Cl), dichloro-isobutylaluminum (Al(i-C₄H₉)Cl₂), monochlorodi-n-pentylaluminum (Al(C₅H₁₁)₂Cl), dichloro-n-pentylaluminum (Al(C₅H₁₁)Cl₂), monochlorodiisopentylaluminum (Al(i-C₅H₁₁)₂Cl), dichloro-isopentylaluminum (Al(i-C₅H₁₁)Cl₂), monochlorodi-n-hexylaluminum (Al(C₆H₁₃)₂Cl), dichloro-n-hexylaluminum (Al(C₆H₁₃)Cl₂), monochlorodiisohexylaluminum (Al(i-C₆H₁₃)₂Cl), dichloro-isohexylaluminum (Al(i-C₆H₁₃)Cl₂), monochloromethylethylaluminum (Al(CH₃)(CH₃CH₂)Cl), monochloromethylpropylaluminum (Al(CH₃)(C₃H₇)Cl), monochloromethyl-n-butylaluminum (Al(CH₃)(C₄H₉)Cl), monochloromethyl-isobutylaluminum (Al(CH₃)(i-C₄H₉)Cl), monochloroethylpropylaluminum (Al(CH₂CH₃)(C₃H₇)Cl), monochloroethyl-n-butylaluminum (AlCH₂CH₃)(C₄H₉)Cl), monochloromethyl-isobutylaluminum (Al(CH₂CH₃)(i-C₄H₉)Cl) and the like, wherein is/are preferable monochlorodiethylaluminum, dichloroethylaluminum, monochlorodi-n-butylaluminum, dichloro-n-butylaluminum, monochlorodiisobutylaluminum, dichloro-isobutylaluminum, monochlorodi-n-hexylaluminum, dichloro-n-hexylaluminum, further preferably chlorodiethylaluminum, dichloroethylaluminum and monochlorodi-n-hexylaluminum, and most preferably monochlorodiethylaluminum.

These haloalkyl aluminums can be used alone or in combination at any proportion. In addition, according to the present invention, the cocatalysts can be used alone or in combination at any proportion as required, without any special limitations.

In the present invention, unless otherwise specified, the amount of the cocatalyst is expressed as the content of the Al element.

According to the present invention, in the process for preparing the ultra-high molecular weight polyethylene, the polymerization solvent is selected from an alkane solvent having a boiling point of 5-55° C. or a mixed alkane solvent having a saturated vapor pressure at 20° C. of 20-150 KPa (preferably 40-110 KPa).

According to the present invention, as the alkane solvent having a boiling point of 5-55° C., for example, 2,2-dimethylpropane (also known as neopentane, having a boiling point of 9.5° C., and a saturated vapor pressure at 20° C. of 146.63 KPa), 2-methylbutane (also known as isopentane, having a boiling point of 27.83° C., and a saturated vapor pressure at 20° C. of 76.7 KPa), n-pentane (having a boiling point of 36.1° C., and a saturated vapor pressure at 20° C. of 56.5 KPa), cyclopentane (having a boiling point of 49.26° C., and a saturated vapor pressure at 20° C. of 34.6 KPa) can be enumerated, preferably an alkane solvent having a boiling point of 25-52° C.

As the mixed alkane solvent having a saturated vapor pressure at 20° C. of 20-150 KPa (preferably 40-110 KPa), it is a mixed solvent formed by mixing different alkane solvents according to a certain ratio, for example, a mixed solvent formed from hexane and an isomer thereof and from pentane and an isomer thereof, or an alkane mixture obtained by cutting according to the distillation range from a solvent distillation unit, preferably a mixed solvent formed from hexane and an isomer thereof. Specifically, a combination of n-pentane and isopentane, a combination of isopentane and neopentane, a combination of n-pentane and cyclopentane, a combination of n-pentane and neopentane, a combination of isopentane and cyclopentane, a combination of neopentane and cyclopentane, a combination of n-hexane and cyclopentane, a combination of n-hexane and n-pentane, a combination of n-pentane-isopentane-cyclopentane, a combination of n-pentane-n-hexane-isopentane, or the like can be enumerated, but not limited thereto, as long as it is a mixed alkane having a saturated vapor pressure at 20° C. of 20-150 KPa (preferably 40-110 KPa).

In one embodiment of the present invention, as the mixed alkane solvent having a saturated vapor pressure at 20° C. of 20-150 KPa (preferably 40-110 KPa), it is preferably a mixed alkane solvent having a saturated vapor pressure at 20° C. of 20-150 KPa (preferably 40-110 KPa) formed by mixing two or more alkanes selected from n-pentane, isopentane, neopentane and cyclopentane, more preferably a combination of n-pentane and isopentane, a combination of isopentane and neopentane, a combination of n-pentane and cyclopentane, a combination of isopentane and cyclopentane, a combination of neopentane and cyclopentane, a combination of neopentane and n-pentane, a combination of n-pentane-isopentane-cyclopentane, a combination of neopentane-isopentane-n-pentane and the like. For the proportion of each alkane in the mixed alkane, for example, when two alkane solvents are mixed, their molar ratio can be 0.01-100:1, preferably 0.1-10:1, and when three alkane solvents are mixed, their molar ratio can be 0.01-100:0.01-100:1, preferably 0.1-10:0.1-10:1, so long as the obtained mixed alkane solvent has a saturated vapor pressure at 20° C. of 20-150 KPa (preferably 40-110 KPa). In one embodiment of the present invention, only an alkane solvent having a boiling point of 5-55° C. or a mixed alkane solvent having a saturated vapor pressure at 20° C. of 20-150 KPa is used as the polymerization solvent.

In the process for preparing the ultra-high molecular weight polyethylene of the present invention, the polymerization temperature of the ethylene slurry polymerization is 50-100° C., preferably 60-90° C. Among them, if the ethylene slurry polymerization is carried out at a higher polymerization temperature, a solvent with a higher boiling point can be used. Conversely, if the ethylene slurry polymerization is carried out at a lower polymerization temperature, a solvent with a lower boiling point can be used. It is known that in the ethylene slurry polymerization condition, under similar and comparable conditions such as polymerization pressure, main catalyst, cocatalyst, and solvent, within the polymerization temperature range described in the present invention, as the polymerization temperature increases, the viscosity-average molecular weight of the thereby obtained ultra-high molecular weight polyethylene increases first and then decreases. Therefore, according to the present invention, the viscosity-average molecular weight of the ultra-high molecular weight polyethylene obtained from the ethylene slurry polymerization can be adjusted and controlled through the polymerization temperature.

In the process for preparing the ultra-high molecular weight polyethylene of the present invention, the polymerization pressure is 0.4-4.0 MPa, preferably 1.0-3.0 MPa, and more preferably 1.5-3.0 MPa. Among them, if the ethylene slurry polymerization is carried out at a higher polymerization temperature, a lower polymerization pressure can be used. Conversely, if the ethylene slurry polymerization is carried out at a lower polymerization temperature, a higher polymerization pressure can be used. In the ethylene slurry polymerization condition, under similar and comparable conditions such as polymerization temperature, main catalyst, cocatalyst, and solvent, within the polymerization pressure range described in the present invention, as the polymerization pressure increases, the viscosity-average molecular weight of the thereby obtained ultra-high molecular weight polyethylene also increases first and then decreases. Therefore, according to the present invention, the viscosity-average molecular weight of the ultra-high molecular weight polyethylene obtained from the ethylene slurry polymerization can also be adjusted and controlled through the polymerization pressure.

The use of an alkane solvent having a boiling point of 5-55° C. or a mixed alkane solvent having a saturated vapor pressure at 20° C. of 20-150 KPa provided by the present invention as a polymerization solvent provides an opportunity and choice for preparing the ultra-high molecular weight polyethylene with different viscosity-average molecular weights through the ethylene slurry polymerization. For example, the use of an alkane solvent having a lower boiling point (for example n-pentane, isopentane or cyclopentane and the like) or a mixed alkane solvent having a higher saturated vapor pressure at 20° C. (for example a combination of n-pentane and neopentane, a combination of isopentane and neopentane and the like) is prone to the heat removal of the ethylene slurry polymerization reaction, and therefore can be carried out at a higher polymerization pressure and a lower polymerization temperature, while the use of an alkane solvent having a higher boiling point or a mixed alkane solvent having a lower saturated vapor pressure at 20° C. can be carried out at a lower polymerization pressure and a higher polymerization temperature in order to effectively remove the heat from the polymerization reaction.

In one embodiment of the present invention, an ultra-high viscosity-average molecular weight polyethylene is provided, wherein the ultra-high viscosity-average molecular weight polyethylene has a viscosity-average molecular weight of 150-1000×10⁴ g/mol, a bulk density of 0.30-0.55 g/cm³, a true density of 0.910-0.950 g/cm³, a titanium content of 0-3 ppm, a calcium content of 0-5 ppm, a magnesium content of 0-10 ppm, an aluminum content of 0-30 ppm, a chlorine content of 0-50 ppm, a total ash content of less than 200 ppm, a melting point of 140-152° C., a crystallinity of 40-70%, a tensile yield strength of greater than 22 MPa, a tensile strength at break of greater than 32 MPa, an elongation at break of greater than 350%, an impact strength of greater than 70 KJ/m², and a Young's modulus of greater than 300 MPa.

In one embodiment of the present invention, an ultra-high viscosity-average molecular weight polyethylene is provided, wherein it has a viscosity-average molecular weight of 300-800×10⁴ g/mol, a bulk density of 0.33-0.52 g/cm³, a true density of 0.915-0.945 g/cm³, a titanium content of 0-2 ppm, a calcium content of 0-3 ppm, a magnesium content of 0-5 ppm, an aluminum content of 0-20 ppm, a chlorine content of 0-30 ppm, a total ash content of less than 150 ppm, a melting point of 142-150° C., a crystallinity of 45-65%, a tensile yield strength of greater than 25 MPa, a tensile strength at break of greater than 35 MPa, an elongation at break of greater than 400%, an impact strength of greater than 75 KJ/m², and a Young's modulus of greater than 350 MPa.

In one embodiment of the present invention, an ultra-high viscosity-average molecular weight ethylene copolymer is provided, wherein the ultra-high molecular weight ethylene copolymer has a viscosity-average molecular weight of 150-800×10⁴ g/mol, a bulk density of 0.30-0.55 g/cm³, a true density of 0.900-0.950 g/cm³, a comonomer molar insertion rate of 0.05-4.0%, a titanium content of 0-3 ppm, a calcium content of 0-5 ppm, a magnesium content of 0-10 ppm, an aluminum content of 0-30 ppm, a chlorine content of 0-50 ppm, a total ash content of less than 200 ppm, a melting point of 140-152° C., a crystallinity of 40-70%, and a tensile elasticity module of greater than 250 MPa.

In one embodiment of the present invention, an ultra-high viscosity-average molecular weight ethylene copolymer is provided, wherein the ethylene copolymer has a viscosity-average molecular weight of 300-700×10⁴ g/mol, a bulk density of 0.33-0.52 g/cm³, a true density of 0.905-0.945 g/cm³, a comonomer molar insertion rate of 0.10-2.0%, a titanium content of 0-2 ppm, a calcium content of 0-3 ppm, a magnesium content of 0-5 ppm, an aluminum content of 0-20 ppm, a chlorine content of 0-30 ppm, a total ash content of less than 150 ppm, a melting point of 142-150° C., a crystallinity of 45-65%, and a tensile elasticity module of greater than 280 MPa.

In one embodiment of the present invention, a process for preparing an ultra-high viscosity-average molecular weight polyethylene by polymerization is provided, wherein ethylene and optionally a comonomer are subjected to the slurry polymerization with a supported non-metallocene catalyst as the main catalyst, with one or more of aluminoxane, alkyl aluminum, and haloalkyl aluminum as the cocatalyst, with an alkane solvent having a boiling point of 5-55° C. or a mixed alkane solvent having a saturated vapor pressure at 20° C. of 20-150 KPa as the polymerization solvent, at a polymerization temperature of 50-100° C., under a polymerization pressure 0.4-4.0 of MPa, in the ethylene slurry polymerization condition, and the ethylene slurry polymerization activity is higher than 2×10⁴ g polyethylene/g main catalyst.

In one embodiment of the present invention, in the process for preparaing the ultra-high viscosity-average molecular weight polyethylene by polymerization, ethylene is subjected to the slurry polymerization at a polymerization temperature of 60-90° C., under a polymerization pressure of 1.0-3.0 MPa, in the ethylene slurry polymerization condition, and the ethylene slurry polymerization activity is higher than 3×10⁴ g polyethylene/g main catalyst, and when the comonomer is present, the molar ratio of the comonomer to the active metal in the catalyst is 20-400:1.

In the process for preparing the ultra-high molecular weight polyethylene of the present invention, the ethylene slurry polymerization reactor is not limited in any way, as long as ethylene and optionally the comonomer can come into contact with the main catalyst and the cocatalyst in the solvent within the ranges of the polymerization pressure and the polymerization temperature described in the present invention. In order to effectively avoid the material adhesion and aggregation, it can a tank-type ethylene slurry stirring reactor. For a stirring tank, there is no specific limitation to its stirring rate. As long as it can ensure the normal dispersion of the slurry in the reactor, the stirring rotation speed is related to the reactor volume. Generally speaking, the smaller the reactor volume is, the higher the stirring rotation speed is required. The stirring rotation speed is 10-1000 rpm, preferably 20-500 rpm.

In the process for preparing the ultra-high molecular weight polyethylene of the present invention, there is no specific limitation on the polymerization reaction time as long aswithin a certain polymerization time, based on the main catalyst of the present invention, the polymerization activity of the ethylene slurry polymerization is higher than 2×10⁴ gpolyethylene/g main catalyst, preferably the polymerization activity of the ethylene slurry polymerization is higher than 3×10⁴ g polyethylene/g main catalyst, most preferably the polymerization activity is higher than 4×10⁴ g polyethylene/g main catalyst.

According to the present invention, the mode of adding the supported non-metallocene catalyst as the main catalyst and one or more of aluminoxane, alkyl aluminum or haloalkyl aluminum as the cocatalyst to the polymerization reaction system can be as follows: first adding the main catalyst and then adding the cocatalyst; or first adding the cocatalyst and then adding the main catalyst; or first mixing by contact of the main catalyst and the cocatalyst and then adding them together; or adding the main catalyst and the cocatalyst separately at the same time. When the main catalyst and the cocatalyst are separately added, they can be successively added to the same charge pipe, or successively added to the different charge pipes; while when the main catalyst and the cocatalyst are separately added at the same time, they should be added to the different charge pipes.

In the preparation of the ultra-high molecular weight polyethylene having a low metal element content of the present invention, in order to reduce the metal element content in the polymer, it is necessary to fully release and exert the catalytic activity of the main catalyst for the ethylene polymerization reaction. By using the supported non-metallocene catalyst described in the present invention, under the polymerization reaction conditions including the polymerization pressure, the polymerization temperature, the polymerization solvent, and the optional participation of the comonomer, the ultra-high molecular weight polyethylene having a low metal element content and a low ash content can be obtained.

According to the present invention, the polymerization pressure and the polymerization solvent of the present invention are conducive to achieving the high catalyst activity, and thereby obtaining the ultra-high molecular weight polyethylene having a low metal element content. The polymerization temperature of the present invention is conducive to achieving the high catalyst activity, but it will affect the viscosity-average molecular weight of the thereby obtained polyethylene. In addition, the extended polymerization time is also conducive to achieving high catalyst activity.

The ultra-high molecular weight polyethylene of the present invention is an ultra-high molecular weight polyethylene having a low metal element content and a low ash content, and has mechanical properties such as high tensile yield strength, high tensile fracture strength, and higher impact strength. Therefore, the polyethylene of the present invention can be suitable for preparing high-end materials such as high-strength ultra-high molecular weight polyethylene fibers and artificial medical joints.

EXAMPLES

The present invention will be described in further detail with reference to examples, but the present invention is not limited to these examples.

The determination of the bulk density of the ultra-high molecular weight polyethylene is carried out in accordance with the standard GB 1636-79, and the true density is determined based on the gradient column method in a density tube in accordance with the standard GB/T 1033-86.

The polymerization activity of the main catalyst is calculated according to the following process: after the polymerization reaction is completed, the polymerization product in the reaction tank is filtered and dried, and then the polymerization product is weighed, the polymerization activity (in kg polymer/g catalyst or kg PE/gCat) of the catalyst is represented by the ratio of the mass of the polymerization product divided by the mass of the used polyethylene main catalyst (the supported non-metallocene catalyst).

The contents of the active metal element of the supported non-metallocene catalyst and the elements such as titanium, magnesium, calcium, aluminum, silicon and chlorine of the ultra-high molecular weight polyethylene are determined by the ICP-AES method.

The ash content in the ultra-high molecular weight polyethylene is determined with the direct calcining method in accordance of the national standard GBT9345.1-2008. The polymer is burned in a muffle furnace and its residue is treated at a high temperature until constant weight, the content is obtained by dividing the mass of the residue by the initial polymer mass.

The determination of the comonomer insertion rate in the ultra-high molecular weight ethylene copolymer is performed as follows, a copolymer with a known content is calibrated with a nuclear magnetic resonance method and the measurement is performed with a 66/S Fourier transform infrared spectrometer of German Bruck Corporation.

The viscosity-average molecular weight of the ultra-high molecular weight ethylene is calculated according to the following method: in accordance of the standard ASTM D4020-00, the intrinsic viscosity of the polymer is measured using a high-temperature dilution type Ubbelohde viscometer process (with a capillary inner diameter of 0.44 mm, a constant temperature bath medium of 300 # silicone oil, a dilution solvent of decalin, and a measurement temperature of 135° C.), and then the viscosity-average molecular weight Mv of the polymer is calculated according to the following equation.

Mv=5.37×10⁴×[η]^1.37

wherein, η is the intrinsic viscosity.

The determination of the solvent residue content in the wet material after polymerization reaction is performed as follows: directly filtering the ethylene slurry polymer powder obtained after the polymerization reaction is completed in the polymerization reactor with a 100 mesh filter screen, weighing the wet polymer and recording the mass as m1, and then completely drying the wet polymer under the vacuum of 20 mBar at 80° C. and weighing the dried polymer powder and recording the mass as m2, and then calculating out the solvent residue content.

$\mathrm{Solvent}\mathrm{residual}\mathrm{content}=\left(\frac{m1-m2}{m2}\right)\times 100\%$

The determination of the melting point and the crystallinity of the ultra-high molecular weight polyethylene is performed by using a differential thermal scanning calorimetry. The instrument is the Q1000 DSC differential thermal scanning calorimeter of TA Corporation, USA, and the determination is performed according to the standard YYT0815-2010. The tensile yield strength, the fracture strength, and the elongation at break of the polymer are measured in accordance with the standard GB/T 1040.2-2006. The impact strength of the polymer is determined in accordance with GB/T 1043-1993. The Young's modulus is measured using a universal testing machine, where the compression conditions include the pre-pressing temperature is 80° C. and the pre-pressing pressure is 7.0 MPa, the hot-pressing temperature is 190° C. and the hot-pressing pressure is 7.0 MPa; the cold-pressing temperature is the normal temperature, and the cold-pressing pressure is 15.0 MPa. The tensile elasticity modulus is measured using a universal testing machine in accordance of GB/T 1040.2-2006, where the compression conditions include the pre-pressing temperature is 80° C. and the pre-pressing pressure is 7.0 MPa, the hot-pressing temperature is 190° C. and the hot-pressing pressure is 7.0 MPa; the cold-pressing temperature is the normal temperature, and the cold-pressing pressure is 15.0 MPa.

Example 1: Preparation of Main Catalyst

Example 1-1

The magnesium compound was anhydrous magnesium chloride, the first solvent was tetrahydrofuran, the alcohol was ethanol, and the porous support was silica, i.e., silica gel, which was ES757 from Ineos Company. The silica gel was first thermally activated by continuous calcining at 600° C. in a nitrogen atmosphere for 4 hours. The Group IVB chemical treating agent was titanium tetrachloride (TiCl₄), the second solvent was dichloromethane, and the non-metallocene complex was a compound having a structure of

5 g of the magnesium compound was added to the first solvent, then the alcohol was added. The mixture was completely dissolved at room temperature to obtain a magnesium compound solution. Then the porous support was added. The resulting mixture was stirred for 2 hours to obtain a first mixed slurry. Then the slurry was uniformly heated to 90° C., and directly vacuumized and dried to obtain a composite support.

The obtained composite support was added to a hexane solvent. The Group IVB chemical treating agent was added dropwise within 30 minutes at normal temperature. Then the resulting mixture was uniformly heated to 60° C. to perform an isothermal reaction for 2 hours, then filtered, washed with the hexane solvent three times with the used amount for each washing identical to the amount of the solvent added before, and finally dried in vacuum at 60° C. to produce a modified composite support.

At room temperature, the non-metallocene complex was added to the second solvent, followed by the addition of the modified composite support. The resulting mixture was stirred for 4 hours, then standed in a sealed state for 12 hours, and then directly vacuumized and dried at normal temperature to obtain a supported non-metallocene catalyst.

The used proportioning included the mass ratio of the magnesium compound and the porous support was 1:2; the molar ratio of the magnesium compound as the Mg element to the alcohol was 1:2; the proportion of the magnesium compound and the first solvent was 1 mol:210 mL; the molar ratio of the composite support as the Mg element to the chemical treating agent as the Group IVB metal element was 1:0.20; the molar ratio of the composite support as the Mg element to the non-metallocene complex was 1:0.08. The proportion of the non-metallocene complex relative to said second solvent was 0.1 g/mL.

The supported non-metallocene catalyst was denoted as CAT-1.

Example 1-2

It was basically the same as Example 1-1, but with the following changes. The magnesium compound was changed to ethyloxy magnesium (Mg(OC₂H₅)₂), the alcohol was changed to n-butanol, the first solvent was changed to toluene, the porous support was a partially crosslinked (crosslinking degree of 30%) polystyrene. The polystyrene was continously dried at 85° C. under a nitrogen gas atmosphere for 12 hours. The chemical treating agent was changed to zirconium tetrachloride (ZrCl₄).

The used non-metallocene complex was

the second solvent was changed to toluene, the change in the treatment of the first mixed slurry included adding a precipitating agent hexane to the first mixed slurry to make it completely precipitate, filtering and washing with the precipitating agent three times, vacuuming at 60° C. and then drying.

The used proportioning included the mass ratio of the magnesium compound and the porous support was 1:1; the molar ratio of the magnesium compound as the Mg element to the alcohol was 1:1; the proportion of the magnesium compound and the first solvent was 1 mol:150 mL; the molar ratio of the composite support as the Mg element to the chemical treating agent as the Group IVB metal element was 1:0.30; the molar ratio of the composite support as the Mg element to the non-metallocene complex was 1:0.10; the volume ratio of the precipitating agent to the first solvent was 1:1. The proportion of the non-metallocene complex relative to said second solvent was 0.06 g/mL.

The supported non-metallocene catalyst was denoted as CAT-2.

Example 1-3

It was basically the same as Example 1-1, but with the following changes. The magnesium compound was changed to anhydrous magnesium bromide (MgBr₂), the alcohol was changed to 2-ethylhexanol, the first solvent and the second solvent were changed to hexane, and the used porous support was montmorillonite. The montmorillonite was continously calcined at 300° C. under a nitrogen gas atmosphere for 6 hours. The chemical treating agent was changed to titanium tetrabromide (TiBr₄), and the used non-metallocene complex was

The change in the treatment of the first mixed slurry included being directly vacuumized and dried at 105° C.

The used proportioning included the mass ratio of the magnesium compound and the porous support was 1:5; the molar ratio of the magnesium compound as the Mg element to the alcohol was 1:0.7; the proportion of the magnesium compound and the first solvent was 1 mol:280 mL; the molar ratio of the composite support as the Mg element to the chemical treating agent as the Group IVB metal element was 1:0.10; and the molar ratio of the composite support as the Mg element to the non-metallocene complex was 1:0.05. The proportion of the non-metallocene complex relative to said second solvent was 0.05 g/mL.

The supported non-metallocene catalyst was denoted as CAT-3.

Example 2: Preparation of Ultra-High Molecular Weight Ethylene Homopolymer

A 5 L polymerization autoclave was purged with a high-purity nitrogen at 100° C. for 2 hour and then vented to remove the pressure therein. 2.5 L of the solvent was added. Then the main catalyst (the supported non-metallocene catalysts CAT-1 to CAT-3) prepared in Example 1 of the present invention and the cocatalyst were added under stirring conditions (300 rpm). The autoclave was heated up to a preset temperature, ethylene was continously introduced and the constant temperature and pressure were maintained to reach the preset polymerization time. The introduction of ethylene was stopped and the autoclave was vented to remove the pressure therein. The autoclave was cooled down to room temperature. The polymer together with the solvent was discharged from the autoclave. The supernatant solvent was removed, and the resulting material was dried and weighed to obtain the final mass. The specific conditions of the ethylene slurry homopolymerization reaction were shown in Table 1. The basic performance result of the thereby obtained ultra-high molecular weight polyethylene was shown in Table 2. The summary of the results of the metal element content, the ash content and the mechanical property of the ultra-high molecular weight polyethylene prepared by the ethylene slurry polymerization was shown in Table 3.

Comparative Example 2-1

This comparative example was substantially identical to Example 2, except that the polymerization solvent was changed to n-hexane as the solvent, the polymer number was UHMWPE15. The specific conditions of the ethylene slurry polymerization reaction were shown in Table 1. The performance result of the thereby obtained ultra-high molecular weight polyethylene prepared by the ethylene slurry polymerization was shown in Table 2. The summary of the results of the metal element content, the ash content and the crystallinity of the ultra-high molecular weight polyethylene prepared by the ethylene slurry polymerization was shown in Table 3.

Comparative Example 2-2

This comparative example was substantially identical to Example 2, except that the polymerization solvent was changed to n-heptane as the solvent, the polymer number was UHMWPE16. The specific conditions of the ethylene slurry polymerization reaction were shown in Table 1. The performance result of the thereby obtained ultra-high molecular weight polyethylene prepared by the ethylene slurry polymerization was shown in Table 2. The summary of the results of the metal element content, the ash content and the crystallinity of the ultra-high molecular weight polyethylene prepared by the ethylene slurry polymerization was shown in Table 3.

Comparative Example 2-3

This comparative example was substantially identical to Example 2, except that the catalyst was changed to a dichlorozirconocene supported on silica gel-type metallocene catalyst, the used cocatalyst was methyl aluminoxane, and the polymerization was performed for 6 hours. It was found that the polymerization activity was extremely low (less than 2 kgPE/g Cat), and the viscosity-average molecular weight of the polymer was less than 60×10⁴ g/mol.

Comparative Example 2-4

This comparative example was substantially identical to Example 2, except that the catalyst was changed to the CM-type Ziegler-Natta catalyst (the support was a magnesium compound and free of silicon, also known as the CMU catalyst) of Beijing Auda Division of Sinopec Catalyst Co., Ltd., the polymer number was UHMWPE17. The specific conditions of the ethylene slurry polymerization reaction were shown in Table 1. The performance result of the thereby obtained ultra-high molecular weight polyethylene prepared by the ethylene slurry polymerization was shown in Table 2. The summary of the results of the metal element content, the ash content and the crystallinity of the ultra-high molecular weight polyethylene prepared by the ethylene slurry polymerization was shown in Table 3.

TABLE 1
Summary of the reaction conditions of the preparation of the ultra-high molecular
weight ethylene homopolymer by the ethylene slurry homopolymerization
			Molar ratio
			of cocatalyst		Polymer-	Polymer-	Polymer-	Polymer-
			to main		ization	ization	ization	ization
	Main		catalyst's	Polymerization	pressure	temperature	time	activity	Polymer
No.	catalyst	Cocatalyst	active metal	solvent	(MPa)	(° C.)	(h)	(104 × gPE/gCat)	number
1	CAT-1	triethyl	40	n-pentane	1.9	70	6	4.7	UHMWPE1
		aluminum
2	CAT-1	triethyl	100	n-pentane	1.9	70	6	4.9	UHMWPE2
		aluminum
3	CAT-1	methyl	40	n-pentane	1.9	75	6	5.3	UHMWPE3
		aluminoxane
4	CAT-1	triethyl	40	Mixed alkane solvent	1.0	83	8	5.5	UHMWPE4
		aluminum		composed of n-pentane
				and isopentane according
				to the molar proportion
				of 1:1 and having a
				saturated vapor pressure
				at 20° C. of 66.6 KPa
5	CAT-1	monochloro-	70	cyclopentane	1.9	80	5	7.1	UHMWPE5
		diethyl-
		aluminum
6	CAT-1	triethyl	40	Mixed alkane solvent	0.5	70	10	4.5	UHMWPE6
		aluminum		composed of n-pentane,
				isopentane and cyclopentane
				according to the molar
				proportion of 1:1:1 and
				having a saturated vapor
				pressure at 20° C.
				of 55.93 KPa
7	CAT-2	triethyl	40	isopentane	2.8	60	4	5.2	UHMWPE7
		aluminum
8	CAT-2	dichloro-	50	Mixed alkane solvent	2.6	65	4	4.3	UHMWPE8
		ethyl-		composed of n-pentane and
		aluminum		isopentane according to
				the molar proportion of 1:1
				and having a saturated
				vapor pressure at
				20° C. of 66.6 KPa
9	CAT-3	tri-iso-butyl	60	neopentane	2.2	85	3	6.0	UHMWPE9
		aluminum
10	CAT-1	triethyl	40	Mixed alkane solvent	1.9	70	6	5.4	UHMWPE10
		aluminum		composed of n-pentane and
				cyclopentane according
				to the molar proportion of
				5:1 and having a saturated
				vapor pressure at 20° C.
				of 52.85 KPa
11	CAT-1	triethyl	40	Mixed alkane solvent	1.9	70	6	5.1	UHMWPE11
		aluminum		composed of neopentane
				and isopentane according
				to the molar proportion
				of 0.5:1 and having a
				saturated vapor pressure
				at 20° C. of 100.01 KPa
12	CAT-1	triethyl	40	Mixed alkane solvent	1.9	70	6	5.2	UHMWPE12
		aluminum		composed of isopentane
				and cyclopentane according
				to the molar proportion
				of 8:1 and having a
				saturated vapor pressure
				at 20° C. of 72.02 KPa
13	CAT-2	triethyl	40	Mixed alkane solvent	2.8	60	4	5.5	UHMWPE13
		aluminum		composed of neopentane
				and n-pentane according
				to the molar proportion
				of 0.4:1 and having a
				saturated vapor pressure
				at 20° C. of 82.25 KPa
14	CAT-3	tri-iso-butyl	60	Mixed alkane solvent	2.2	85	3	6.4	UHMWPE14
		aluminum		composed of neopentane,
				isopentane and n-pentane
				according to the molar
				proportion of 0.5:0.5:1
				and having a saturated
				vapor pressure at 20° C.
				of 84.08 KPa
15	CAT-1	triethyl	40	n-hexane	1.9	70	6	4.2	HMWPE15
		aluminum
16	CAT-1	triethyl	40	n-heptane	1.9	70	6	4.5	UHMWPE16
		aluminum
17	CM	triethyl	40	n-pentane	1.9	70	6	3.7	UHMWPE17
		aluminum

TABLE 2
The summary of the performance results of the ultra-high molecular weight
ethylene homopolymer prepared by the ethylene slurry polymerization
		Solvent	Viscosity-
		content	average		Polymer	Tensile	Tensile
		in wet	molecular	Bulk	true	yield	fracture	Elongation	Impact	Young's
	Polymer	material	weight	density	density	strength	strength	at break	strength	modulus
No.	number	(wt %)	(104 g/mol)	(g/cm3)	(g/cm3)	(MPa)	(MPa)	(%)	(KJ/m2)	(MPa)
1	UHMWPE1	17.4	670	0.45	0.922	25.3	39.5	469.9	82.5	412.7
2	UHMWPE2	17.0	620	0.43	0.923	24.5	38.2	453.3	81.3	416.7
3	UHMWPE3	15.5	945	0.44	0.918	26.3	44.7	380.5	85.4	405.5
4	UHMWPE4	18.8	265	0.42	0.937	22.6	34.7	407.1	76.4	421.0
5	UHMWPE5	16.2	535	0.43	0.933	24.2	36.7	427.5	74.8	430.3
6	UHMWPE6	12.7	735	0.42	0.920	26.0	42.4	375.4	91.3	369.2
7	UHMWPE7	15.9	830	0.40	0.921	26.4	43.7	438.3	88.5	400.2
8	UHMWPE8	17.4	515	0.45	0.932	24.0	36.4	433.8	83.4	405.4
9	UHMWPE9	17.5	170	0.40	0.940	22.8	33.4	440.5	104.3	372.3
10	UHMWPE10	17.3	705	0.45	0.920	25.7	41.4	480.3	85.2	418.3
11	UHMWPE11	17.0	685	0.45	0.920	25.4	40.1	475.5	84.3	417.5
12	UHMWPE12	17.2	690	0.45	0.920	25.5	40.6	478.2	83.7	415.6
13	UHMWPE13	15.5	850	0.42	0.920	27.0	44.4	449.3	91.0	405.6
14	UHMWPE14	16.9	195	0.40	0.938	23.0	33.8	450.2	107.3	380.5
15	UHMWPE15	25.7	470	0.39	0.935	20.4	30.5	325.4	64.3	276.3
16	UHMWPE16	29.4	425	0.38	0.936	21.5	31.3	314.3	67.5	283.5
17	UHMWPE17	18.5	385	0.39	0.938	21.8	32.3	335.4	74.3	322.7

TABLE 3
The summary of the results of metal element content, ash content, melting point and crystallinity of
the ultra-high molecular weight ethylene homopolymer prepared by the ethylene slurry polymerization
		Titanium	Calcium	Magnesium	Aluminum	Chlorine	Silicon	Ash	Melting
	Polymer	content	content	content	content	content	content	content	point	Crystallinity
No.	number	(ppm)	(ppm)	(ppm)	(ppm)	(ppm)	(ppm)	(ppm)	(° C.)	(%)
1	UHMWPE1	0.50	1.61	1.47	12.0	12.4	2.3	75	145.4	65.1
2	UHMWPE2	0.49	1.59	1.45	16.7	16.3	2.1	70	145.0	63.0
3	UHMWPE3	0.45	1.52	1.34	13.2	14.5	1.9	64	148.5	64.4
4	UHMWPE4	0.44	1.50	1.31	13.0	33.3	1.8	61	142.3	67.5
5	UHMWPE5	0.38	0.77	1.07	14.8	19.4	1.5	50	144.8	47.5
6	UHMWPE6	0.52	1.65	1.53	12.4	15.5	2.4	80	146.2	46.3
7	UHMWPE7	0.42	1.48	1.28	13.7	25.4	1.7	60	147.2	51.4
8	UHMWPE8	0.62	1.25	1.64	11.5	22.7	2.5	77	145.3	62.5
9	UHMWPE9	0.85	1.82	1.22	14.3	23.5	1.6	68	143.8	69.3
10	UHMWPE10	0.48	1.55	1.42	11.5	12.0	2.2	72	145.5	64.7
11	UHMWPE11	0.46	1.53	1.40	11.2	11.4	2.0	68	145.7	64.5
12	UHMWPE12	0.49	1.58	1.45	11.7	11.7	2.1	70	145.6	65.0
13	UHMWPE13	0.40	1.44	1.24	13.5	25.8	1.6	58	147.5	51.0
14	UHMWPE14	0.83	1.79	1.20	14.1	24.0	1.5	62	144.3	68.4
15	UHMWPE15	1.52	11.74	11.54	50.5	75.4	3.8	252	140.2	72.3
16	UHMWPE16	1.47	16.62	13.27	38.3	68.3	3.0	217	139.5	71.4
17	UHMWPE17	1.32	2.54	5.54	26.1	43.7	0.5	178	141.6	68.3

It can be seen from the comparison of the effects obtained with Nos. 1 and 2 in Table 1 that the polymerization activities, which were obtained under the conditions that the molar ratios of the cocatalyst to the active metal of the catalyst required by the polymerization process were 40 and 100 respectively, were comparable, which hence indicated that when the catalyst provided by the present invention was used in the olefin polymerization, the required amount of the cocatalyst was relatively low, and therefore the present invention could reduce the used amount of the cocatalyst.

It can be seen from the comparison of Nos. 1 and 2 of Table 2 that under the same other polymerization conditions, increasing the used amount of the cocatalyst would reduce the viscosity-average molecular weight of the polymer. Therefore, using the process for preparing the ultra-high molecular weight polyethylene provided by the present invention could adjust the viscosity-average molecular weight and the performance of the ultra-high molecular weight polyethylene by changing the cocatalyst, and the proportion and the used amount of the cocatalyst. It can be seen from the comparison of the results obtained in Tables 1 and 2 that increasing the polymerization pressure, increasing the polymerization temperature, and extending the polymerization time could achieve high ethylene slurry polymerization activity, thereby reducing the metal element content in the obtained ultra-high molecular weight polyethylene.

It can be seen from the comparison of the effects obtained from Tables 1 and 2 that with the present invention, the performance of the thereby obtained ultra-high molecular weight polyethylene could be adjusted by selecting catalysts having different properties under the appropriate ethylene slurry polymerization conditions, such as the polymerization pressure, the polymerization temperature, the polymerization solvent, the polymerization time, the cocatalyst and the cocatalyst molar ratio.

From the comparison of the results obtained from No. 1 and No. 15 , No. 16 , No. 17 in Tables 1-3, it can be seen that using the process for preparing the ultra-high molecular weight polyethylene of the present invention, it was very easy to dry the ethylene slurry polymer powder obtained after the polymerization was completed. After the polymerization reaction was completed, the product was directly filtered, the residual solvent content in the wet polymer was less than 20 wt %, which was lower than the residual solvent content of higher than 25 wt % in the wet polymer obtained by using n-hexane or n-heptane as the polymerization solvent, which was very conducive to shortening the drying time of the polyethylene material and saving the cost of the polyethylene post-treatment.

Moreover, it can be seen from Tables 2 and 3 that under the conditions of preparing the ultra-high molecular weight polyethylene by the ethylene slurry polymerization of the present invention, compared to using n-hexane or n-heptane as the solvent, the ultra-high molecular weight polyethylene prepared by the polymerization according to the present invention had high bulk density, high viscosity-average molecular weight, low element contents (titanium, calcium, magnesium, aluminum, silicon, chlorine and the like) and low ash content, and the tensile yield strength, the tensile fracture strength, the elongation at break, the impact strength and the Young's modulus of the thereby obtained ultra-high molecular weight ethylene homopolymer were all relatively high.

In addition, it can be seen based on the effects obtained from No. 10 to No. 14 in Tables 1-3 that by using the process for preparing the ultra-high molecular weight polyethylene of the present invention and using the mixed alkane solvent, the obtained polyethylene had higher bulk density, higher viscosity-average molecular weight, lower element contents (titanium , calcium , magnesium , aluminum , silicon , chlorine and the like) and lower ash content, and the tensile yield strength, the tensile fracture strength, the elongation at break, the impact strength and the Young's modulus of the thereby obtained ultra-high molecular weight ethylene homopolymer were all higher.

Example 3. Preparation of Ultra-High Molecular Weight Ethylene Copolymer

A 5 L polymerization autoclave was purged with a high-purity nitrogen at 100° C. for 2 hour and then vented to remove the pressure therein. 2.5 L of the solvent was added. Then the main catalyst (the supported non-metallocene catalysts CAT-1 to CAT-3) prepared in Example 1 of the present invention, the cocatalyst, and the comonomer were added under stirring conditions (300 rpm). The autoclave was heated up to a preset temperature, ethylene was continously introduced and the constant temperature and pressure were maintained to reach the preset polymerization reaction time. The introduction of ethylene was stopped and the autoclave was vented to remove the pressure therein. The autoclave was cooled down to room temperature. The polymer together with the solvent was discharged from the autoclave. The supernatant solvent was removed, and the resulting material was dried and weighed to obtain the final mass. The specific conditions of the ethylene slurry copolymerization reaction were shown in Table 4. The results of the basic performance and the tensile property of the thereby obtained ultra-high molecular weight ethylene copolymer prepared by the ethylene slurry polymerization were shown in Table 5. The summary of the results of the metal element content, the ash content, the melting point and the crystallinity of the ultra-high molecular weight ethylene copolymer prepared by the ethylene slurry polymerization was shown in Table 6.

Comparative Example 3-1

This comparative example was substantially identical to Example 3, except that the polymerization solvent was changed to n-hexane as the solvent, the polymer number was UHMWPE35. The specific conditions of the ethylene slurry polymerization reaction were shown in Table 4. The results of the basic performance and the tensile property of the thereby obtained ultra-high molecular weight ethylene copolymer prepared by the ethylene slurry polymerization were shown in Table 5. The summary of the results of the metal element content, the ash content, the melting point and the crystallinity of the ultra-high molecular weight ethylene copolymer prepared by the ethylene slurry polymerization was shown in Table 6.

Comparative Example 3-2

This comparative example was substantially identical to Example 3, except that the polymerization solvent was changed to n-heptane as the solvent, the polymer number was UHMWPE36. The specific conditions of the ethylene slurry polymerization reaction were shown in Table 4. The results of the basic performance and the tensile property of the thereby obtained ultra-high molecular weight ethylene copolymer prepared by the ethylene slurry polymerization were shown in Table 5. The summary of the results of the metal element content, the ash content, the melting point and the crystallinity of the ultra-high molecular weight ethylene copolymer prepared by the ethylene slurry polymerization was shown in Table 6.

Comparative Example 3-3

This comparative example was substantially identical to Example 3, except that the catalyst was changed to a dichlorozirconocene supported on silica gel-type metallocene catalyst, the used cocatalyst was methyl aluminoxane, and the polymerization was performed for 6 hours. It was found that the reaction slurry could not be obtained, i.e., the reaction could not proceed.

Comparative Example 3-4

This comparative example was substantially identical to Example 3, except that the catalyst was changed to the CM-type Ziegler-Natta catalyst (the support was a magnesium compound and free of silicon, also known as the CMU catalyst) of Beijing Auda Division of Sinopec Catalyst Co., Ltd., the polymer number was UHMWPE37. The specific conditions of the ethylene slurry polymerization reaction were shown in Table 4. The results of the basic performance and the tensile property of the thereby obtained ultra-high molecular weight ethylene copolymer prepared by the ethylene slurry polymerization were shown in Table 5. The summary of the results of the metal element content, the ash content, the melting point and the crystallinity of the ultra-high molecular weight ethylene copolymer prepared by the ethylene slurry polymerization was shown in Table 6.

TABLE 4
Summary of the reaction conditions of the preparation of the ultra-high molecular
weight ethylene copolymer by the ethylene slurry copolymerization
									Polymeri
	Molar ratio								activi
	of cocatalyst			Molar ratio		Polymer-	Polymer-	Polymer-	(104
	to main			of comonomer	Comonomer	ization	ization	ization	gcopoly
	catalyst's	Polymerization		to main	proportion	pressure	temperature	time	g main
catalyst	active metal	solvent	Comonomer	catalyst	(mol %)	(MPa)	(° C.)	(h)	catalyst
iethyl	40	n-pentane	1-hexene	50	0.37	1.9	70	6	5.3
minum
iethyl	100	n-pentane	1-hexene	50	0.37	1.9	70	6	5.5
minum
ethyl	40	n-pentane	1-hexene	100	0.75	1.9	75	6	5.8
inoxane
iethyl	40	Mixed alkane solvent	1-butene	20	0.32	1.0	83	8	6.2
minum		composed of n-pentane
		and isopentane
		according to the molar
		proportion of 1:1 and
		having a saturated
		vapor pressure at
		20° C. of 66.6 KPa
nochlor	70	cyclopentane	1-hexene	200	1.50	1.9	80	5	7.7
ethylalu
inum
iethyl	40	Mixed alkane solvent	Propylene	80	2.25	0.5	70	10	5.0
minum		composed of n-pentane,
		isopentane and
		cyclopentane according
		to the molar proportion
		of 1:1:1 and having a
		saturated vapor
		pressure at 20° C.
		of 55.93 KPa
iethyl	40	isopentane	1-hexene	150	0.68	2.8	60	4	5.8
minum
loroeth	50	Mixed alkane solvent	1-octene	200	1.10	2.6	65	4	4.5
luminum		composed of n-pentane
		and isopentane
		according to the molar
		proportion of 1:1 and
		having a saturated
		vapor pressure at
		20° C. of 66.6 KPa
iso-buty	60	neopentane	1-pentene	300	1.94	2.2	85	3	6.3
uminum
iethyl	40	Mixed alkane solvent	1-hexene	50	0.37	1.9	70	6	5.7
minum		composed of n-pentane
		and cyclopentane
		according to the molar
		proportion of 5:1 and
		having a saturated
		vapor pressure at
		20° C. of 52.85 KPa
iethyl	40	Mixed alkane solvent	1-hexene	50	0.37	1.9	70	6	5.5
minum		composed of
		neopentane and
		isopentane according
		to the molar proportion
		of 0.5:1 and having a
		saturated vapor
		pressure at 20° C.
		of 100.01 KPa
iethyl	40	Mixed alkane solvent	1-hexene	50	0.37	1.9	70	6	5.6
minum		composed of
		isopentane and
		cyclopentane according
		to the molar proportion
		of 8:1 and having a
		saturated vapor
		pressure at 20° C.
		of 72.02 KPa
iethyl	40	Mixed alkane solvent	1-hexene	150	0.68	2.8	60	4	6.5
minum		composed of
		neopentane and
		n-pentane according to
		the molar proportion
		of 0.4:1 and having a
		saturated vapor
		pressure at 20° C.
		of 82.25 KPa
so-buty	60	Mixed alkane solvent	1-pentene	300	1.07	2.2	85	3	6.2
minum		composed of
		neopentane, isopentane
		and n-pentane
		according to the molar
		proportion of 0.5:0.5:1
		and having a saturated
		vapor pressure at
		20° C. of 84.08 KPa
iethyl	40	n-hexane	1-hexene	50	0.37	1.9	70	6	3.9
minum
iethyl	40	n-heptane	1-hexene	50	0.37	1.9	70	6	3.5
minum
iethyl	40	n-pentane	1-hexene	50	0.37	1.9	70	6	3.8
minum
indicates data missing or illegible when filed

TABLE 5
The summary of the results of the basic performance and the
tensile property of the ultra-high molecular weight ethylene
copolymer prepared by the ethylene slurry polymerization
		Solvent	Viscosity-	Comonomer
		content	average	molar	Polymer	Polymer	Tensile
		in wet	molecular	insertion	bulk	true	elasticity
	Polymer	material	weight	rate	density	density	module
No.	number	(wt %)	(104 g/mol)	(%)	(g/cm3)	(g/cm3)	(MPa)
1	UHMWPE21	18.7	640	0.15	0.46	0.922	323
2	UHMWPE22	18.3	600	0.14	0.45	0.923	310
3	UHMWPE23	16.8	770	0.24	0.47	0.909	344
4	UHMWPE24	17.2	230	1.54	0.44	0.906	304
5	UHMWPE25	17.1	510	1.47	0.42	0.908	335
6	UHMWPE26	14.7	680	0.52	0.41	0.910	372
7	UHMWPE27	16.3	762	0.47	0.41	0.913	364
8	UHMWPE28	19.3	455	0.35	0.43	0.935	285
9	UHMWPE29	18.4	155	1.77	0.44	0.938	325
10	UHMWPE30	18.2	675	0.19	0.47	0.920	347
11	UHMWPE31	17.5	650	0.17	0.47	0.921	338
12	UHMWPE32	18.0	645	0.17	0.47	0.921	330
13	UHMWPE33	16.1	785	0.51	0.47	0.912	374
14	UHMWPE34	18.2	170	1.92	0.47	0.937	332
15	UHMWPE35	25.4	380	0.05	0.39	0.932	227
16	UHMWPE36	30.3	365	0.03	0.38	0.934	205
17	UHMWPE37	19.6	330	0.06	0.40	0.937	258

TABLE 6
The summary of the results of metal element content, ash content, melting point and crystallinity of
the ultra-high molecular weight ethylene copolymer prepared by the ethylene slurry polymerization
		Titanium	Calcium	Magnesium	Aluminum	Chlorine	Silicon	Ash	Melting
	Polymer	content	content	content	content	content	content	content	point	Crystallinity
No.	number	(ppm)	(ppm)	(ppm)	(ppm)	(ppm)	(ppm)	(ppm)	(° C.)	(%)
1	UHMWPE21	0.50	1.61	1.47	12.0	11.5	2.0	71	146.3	64.5
2	UHMWPE22	0.49	1.59	1.45	12.7	15.2	1.8	70	145.6	63.0
3	UHMWPE23	0.45	1.52	1.34	13.2	13.6	1.5	68	148.8	64.4
4	UHMWPE24	0.44	1.50	1.31	13.0	30.4	1.5	65	145.4	61.5
5	UHMWPE25	0.38	0.77	1.07	14.8	17.4	1.2	62	145.2	47.5
6	UHMWPE26	0.52	1.65	1.53	12.4	12.4	2.1	75	146.6	46.3
7	UHMWPE27	0.42	1.48	1.28	13.7	20.3	1.5	62	147.3	62.5
8	UHMWPE28	0.35	0.62	1.01	15.2	22.2	1.3	64	144.4	57.4
9	UHMWPE29	0.30	0.55	0.94	13.4	29.0	1.6	57	143.2	74.2
1	UHMWPE30	0.46	1.50	1.40	11.2	10.8	1.8	65	147.2	63.1
11	UHMWPE31	0.48	1.57	1.45	11.6	11.0	1.9	67	146.7	64.0
12	UHMWPE32	0.48	1.58	1.44	11.7	11.2	1.9	68	146.9	64.2
13	UHMWPE33	0.40	1.42	1.23	13.0	20.8	1.4	60	147.7	62.2
14	UHMWPE34	0.29	0.52	0.90	13.2	29.7	1.4	55	143.9	74.0
15	UHMWPE35	3.15	15.54	57.4	45.5	75.4	7.4	237	142.2	71.4
16	UHMWPE36	3.64	17.27	42.8	47.3	74.7	8.2	220	142.5	72.3
17	UHMWPE37	1.45	2.28	8.3	28.0	41.5	0.5	164	139.2	67.5

It can be seen from the comparison of the effects obtained with Nos. 1 and 2 in Table 4 that the polymerization activities, which were obtained under the conditions that the molar ratios of the cocatalyst to the active metal of the catalyst required by the polymerization process were 40 and 100 respectively, were comparable, which hence indicated that when the catalyst provided by the present invention was used in the olefin polymerization, the required amount of the cocatalyst was relatively low, and therefore the present invention could reduce the used amount of the cocatalyst.

It can be seen from the comparison of Nos. 1 and 2 of Table 5 that under the same other polymerization conditions, increasing the used amount of the cocatalyst would reduce the viscosity-average molecular weight of the polymer. Therefore, using the process for preparing the ultra-high viscosity-average molecular weight ethylene copolymer provided by the present invention could adjust the viscosity-average molecular weight and the performance of the ultra-high viscosity-average molecular weight polyethylene by changing the cocatalyst, and the proportion and the used amount of the cocatalyst.

It can be seen from the comparison of the results obtained in Tables 4 and 5 that increasing the polymerization pressure, increasing the polymerization temperature, and extending the polymerization time could achieve high ethylene slurry polymerization activity, thereby reducing the metal element content in the obtained ultra-high viscosity-average molecular weight polyethylene.

It can be seen from the comparison of the effects obtained from Tables 4 and 5 that with the present invention, the performance of the thereby obtained ultra-high viscosity-average molecular weight polyethylene could be adjusted by selecting catalysts having different properties under the appropriate ethylene slurry polymerization conditions, such as the polymerization pressure, the polymerization temperature, the polymerization solvent, the polymerization time, the cocatalyst and the cocatalyst molar ratio.

From the comparison of the results obtained from No. 1 and No. 15 , No. 16 and No. 17 in Tables 4-6, it can be seen that using the process for preparing the ultra-high viscosity-average molecular weight ethylene copolymer of the present invention, it was very easy to dry the ethylene slurry polymer powder obtained after the polymerization was completed. After the polymerization reaction was completed, the product was directly filtered, the residual solvent content in the wet polymer was less than 20 wt %, which was lower than the residual solvent content of higher than 25 wt % in the wet polymer obtained by using n-hexane or n-heptane as the polymerization solvent, which was very conducive to shortening the drying time of the polyethylene material and saving the cost of the polyethylene post-treatment.

Moreover, it can be seen from Table 5 that under the conditions of preparing the ultra-high molecular weight polyethylene by the ethylene slurry polymerization of the present invention, compared to using n-hexane and n-heptane as the solvent, the ultra-high molecular weight polyethylene prepared by the polymerization according to the present invention had high bulk density, high viscosity-average molecular weight, low element contents (titanium, calcium, magnesium, aluminum, silicon, chlorine and the like) and low ash content, and the tensile elasticity modulus of the thereby obtained ultra-high molecular weight ethylene copolymer was relatively high.

In addition, it can be seen based on the effects obtained from No. 10 to No. 14 in Tables 4-6 that by using the process for preparing the ultra-high viscosity-average molecular weight ethylene copolymer of the present invention and using the mixed alkane solvent, the obtained polyethylene had higher bulk density, higher viscosity-average molecular weight, lower element contents (titanium, calcium, magnesium, aluminum, silicon, chlorine and the like) and lower ash content, and the tensile elasticity modulus of the thereby obtained ultra-high molecular weight ethylene copolymer was higher.

Although the embodiments of the present invention have been described in detail with reference to the examples, it should be noted that the scope of the present invention is not limited by the embodiments, but is defined by the appended claims. Those skilled in the art can appropriately modify the embodiments without departing from the technical spirit and scope of the present invention, and it is obvious that the modified embodiments are also included in the scope of the present invention.

Claims

1. A process for preparing an ultra-high molecular weight polyethylene, wherein said ultra-high molecular weight polyethylene has a viscosity-average molecular weight of 150-1000×104 g/mol, preferably 200-850×104 g/mol, more preferably 300-700×104 g/mol, which is characterized in that raw materials containing ethylene and optionally at least one como-nomer are subjected to the slurry polymerization in the absence of hydrogen gas, with a supported non-metallocene catalyst as the main catalyst, with one or more of aluminoxane, alkyl aluminum, and haloalkyl aluminum as the cocatalyst, with an alkane solvent having a boiling point of 5-55° C. or a mixed alkane solvent having a saturated vapor pressure at 20° C. of 20-150 KPa as the polymerization solvent.

2. The process for preparing the ultra-high molecular weight polyethylene according to claim 1, which is characterized in that the tank slurry polymerization is performed under the conditions that the polymerization temperature is 50-100° C., preferably 60-90° C., and the polymerization pressure is 0.4-4.0 MPa, preferably 1.0-3.0 MPa, and the polymerization activity is higher than 2×104 g polyethylene/g main catalyst, preferably higher than 3×104 g polyethylene/g main catalyst, wherein in case that the comonomer is present, relative to the total mole number of ethylene and the comonomer, the proportion of the comonomer is 0.01-3 mol %, preferably 0.01-2 mol %, and ethylene and the comonomer are charged together into the polymerization tank.

3. The process for preparing the ultra-high molecular weight polyethylene according to claim 1 or 2, which is characterized in that the polymerization solvent is one of n-pentane, isopentane, neopentane, and cyclopentane; or a mixed alkane solvent of two or more of n-pentane, isopentane, neopentane and cyclopentane, preferably one of a combination of n-pentane and isopentane, a combination of isopentane and neopentane, a combination of n-pentane and cyclopentane, a combination of n-pentane and neopentane, a combination of isopentane and cyclopentane, a combination of neopentane and cyclopentane, a combination of n-pentane-isopentane-cyclopentane, and a combination of neopentane-isopentane-n-pentane.

4. The process for preparing the ultra-high molecular weight polyethylene according to any of claims 1-3, which is characterized in that said comonomer is selected from C3-C10 alpha-olefins, and can be selected from propene, 1-butene, 1-pentene, 1-hexene, and 1-octene, and preferably selected from 1-butene and 1-hexene.

5. The process for preparing the ultra-high molecular weight polyethylene according to any of claims 1-4, which is characterized in thatthe aluminoxane as said cocatalyst is selected from methyl aluminoxane, ethyl aluminoxane, iso-butyl aluminoxane, n-butyl aluminoxane, and mixture(s) thereof, preferably selected from methyl aluminoxane, iso-butyl aluminoxane, and mixture(s) thereof, the alkyl aluminum as said cocatalyst is selected fromtrimethyl aluminum, triethyl aluminum, tri-propyl aluminum, tri-iso-butyl aluminum, tri-n-butyl aluminum, tri-iso-pentyl aluminum, tri-n-pentyl aluminum, trihexyl aluminum, tri-iso-hexyl aluminum, diethyl methyl aluminum, dimethyl ethyl aluminum, and mixture(s) thereof, preferably selected from trim aluminum, triethyl aluminum, tri-propyl aluminum, tri-iso-butyl aluminum, and mixture(s) thereof, most preferably selected from triethyl aluminum, tri-iso-butyl aluminum, and mixture(s) thereof, the haloalkyl aluminum as said cocatalyst is selected from monochlorodimethylaluminum, dichloromethylaluminum, monochlorodiethylaluminum, dichloroethylaluminum, monochlorodipropylaluminum, dichloropropylaluminum, monochlorodi-n-butylaluminum, dichloro-n-butylaluminum, monochlorodiisobutylaluminum, dichloro -isobutylaluminum, monochlorodi-n-hexylaluminum, dichloro-n-hexylaluminum, monochlorodiisohexylaluminum, dichloro-isohexylaluminum, and mixture(s) thereof, preferably selected from monochlorodiethylaluminum, dichloroethylaluminum, monochlorodi-n-butylaluminum, dichloro-n-butylaluminum, monochlorodiisobutylaluminum, dichloro-isobutylaluminum, monochlorodi-n-hexylaluminum, dichloro-n-hexylaluminum, and mixture(s) thereof, further preferably selected from monochlorodiethylaluminum, dichloroethylaluminum, monochlorodi-n-hexylaluminum, and mixture(s) thereof, and most preferably selected from monochlorodiethylaluminum, dichloroethylaluminum, and mixture(s) thereof.

6. The process for preparing the ultra-high molecular weight polyethylene according to any of claims 1-5, which is characterized in that said supported non-metallocene catalyst contains a non-metallocene complex and a Group IVB metal compound.

7. The process for preparing the ultra-high molecular weight polyethylene according to claim 6, which is characterized in that said non-metallocene complex is selected from compounds having the following chemical structural formulae and mixtures thereof:

8. The preparation process according to claim 7, which is characterized in that said halogen is selected from F, Cl, Br or I; said nitrogen-containing group is selected from

9. The process for preparing the ultra-high molecular weight polyethylene according to claim 6, wherein said Group IVB metal compound is selected from Group IVB metal halide, Group IVB metal alkyl compound, Group IVB metal alkoxy compound, Group IVB metal alkyl halide, Group IVB metal alkoxy halide and mixtures thereof, preferably selected from TiCl4, TiBr4, ZrCl4, ZrBr4, HfCl4, HfBr4 and mixtures thereof, most preferably selected from TiCl4, ZrCl4 and mixtures thereof.

10. An ultra-high molecular weight polyethylene, which is characterized in that the ultra-high molecular weight polyethylene has a viscosity-average molecular weight of 150-1000×104 g/mol, preferably 200-850×104 g/mol, more preferably 300-700×104 g/mol, and a metal element content of 0-50 ppm, preferably 0-30 ppm, and said polyethylene satisfies at least one of Condition (1) and Condition (2): Condition (1): tensile elasticity modulus is greater than 250 MPa, preferably greater than 280 MPa,Condition (2): Young's modulus is greater than 300 MPa, preferably greater than 350 MPa.

11. The ultra-high molecular weight polyethylene according to claim 10, which is characterized in that said polyethylene has a bulk density of 0.30-0.55 g/cm3, preferably 0.33-0.52 g/cm3, more preferably 0.40-0.50 g/cm3, a true density of 0.900-0.940 g/cm3, preferably 0.905-0.935 g/cm3, further preferably 0.915-0.930 g/cm3, a melting point of 140-152° C., preferably 142-150° C., and a crystallinity of 40-75%, preferably 45-70%.

12. The ultra-high molecular weight polyethylene according to claim 10 or 11, which is characterized in that said polyethylene has a titanium content of 0-3 ppm, preferably 0-2 ppm, a calcium content of 0-5 ppm, preferably 0-3 ppm, a magnesium content of 0-10 ppm, preferably 0-5 ppm, an aluminum content of 0-30 ppm, preferably 0-20 ppm, a silicon content of 0-10 ppm, preferably 0-5 ppm, and a chlorine content of 0-50 ppm, preferably 0-30 ppm.

13. The ultra-high molecular weight polyethylene according to any of claims 10-12, which is characterized in that when the polyethylene contains comonomer units, the polyethylene has a random copolymerization structure, the comonomer molar insertion rate is 0.05-4.0%, preferably 0.10-2.0%, the comonomer is selected from C3-C10 alpha-olefins and can be selected from propene, 1-butene, 1-pentene, 1-hexene, and 1-octene, preferably selected from 1-butene and 1-hexene.

14. The ultra-high molecular weight polyethylene according to any of claims 10-13, wherein said polyethylene satisfies at least one of the following condition (3) to condition (6): Condition (3): the tensile yield strength is greater than 22 MPa, preferably greater than 25 MPa,Condition (4): the tensile strength at break is greater than 32 MPa, preferably greater than 35 MPa,Condition (5): the elongation at break is greater than 350%, preferably greater than 400%,Condition (6): the impact strength is greater than 70 KJ/m2, preferably greater than 75 KJ/m2.

15. The ultra-high molecular weight polyethylene according to any of claims 10-14, which is characterized in that said polyethylene has an ash content of less than 200 ppm, preferably less than 150 ppm.