Patent Application
20240359159
The present invention relates to a composite comprising an organometal nanostructure powder and a method for preparing same, more particularly, to a composite comprising an organometal nanostructure powder, that can maintain the properties of the organometal nanostructure powder because of a uniform particle diameter size and being structurally stable, and can reduce the production amount of a fine powder without negatively impacting its ability to adsorb volatile organic compounds (VOC), and a method for preparing same.
An organometal nanostructure is an organic inorganic polymer compound formed by combining a metal ion with an organic ligand and means a crystalline compound with a porous type structure, including both an organic material and an inorganic material in a skeleton structure and having a pore structure with a micro size or a nano size.
Such an organometal nanostructure has a large surface area and pores with a micro size or a nano size, and is used for capturing molecules smaller than the pore size or for separating molecules using the pores according to the size of molecules, as well as used as an adsorbent, a gas-storing material, a sensor, a membrane, a functional thin film, a drug delivery material, a catalyst and a catalyst support, and accordingly, is being actively studied until now.
However, the organometal nanostructure has low thermal stability and structural stability with respect to pressure, and there are problems of not maintaining the properties of an organometal nanostructure powder showing high crystallinity and porous structure type during converting an organometal nanostructure powder to a composite. In addition, due to such problems, there are problems in that technology is limited in converting an organometal nanostructure powder having an average particle diameter of 1 μm to 3 μm into a composite unit having an average particle diameter of a several tens of μm to mm.
In addition, an organometal nanostructure powder has low mutual gathering, and a process of mixing with a binder or an additive and applying a mechanical pressure is required, but by the amount of the binder or additive added, the pores of the organometal nanostructure can be blocked, or crystallinity can be deteriorated. As a result, there are problems in that the surface area of the organometal nanostructure can be markedly reduced, its ability to adsorb volatile organic compounds (VOC) can be degraded, and the production amount of a fine powder can increase due to abrasion.
Accordingly, study on a composite maintaining the conventional properties during converting an organometal nanostructure powder into a composite, not degrading its ability to adsorb volatile organic compounds (VOC), reducing the production of a fine powder due to abrasion, and including structurally stable organometal nanostructure powder, is required.
The present invention is to solve the above-described problems and provides a composite including an organometal nanostructure powder, that can maintain the properties of an organometal nanostructure powder because of the uniform size of a particle diameter and structural stability, can reduce the production amount of a fine powder due to abrasion without deterioration of the ability of the composite to adsorb volatile organic compounds (VOC) and can reinforce manufacturing competitiveness, by adopting a method for preparing a composite by forming a coating part including an organometal nanostructure and a binder on the surface of a seed particle, and a method for preparing same.
The present invention provides a composite and a method for preparing the composite.
Coating ratio={(mass of coated composite)/(mass of seed particles before coating)+(mass of organometal nanostructure before coating)}×100(%) [Mathematical Formula 1]
The composite and the method for preparing same of the present invention show excellent effects of thermal stability and structural stability with respect to pressure because of structural properties formed by an organometal nanostructure and a binder on the surface of a seed particle. In addition, due to the bonding force of the seed particle and the organometal nanostructure, the conventional properties of the organometal nanostructure can be maintained during converting an organometal nanostructure powder into a composite, and effects of reducing the production amount of a fine powder due to abrasion can be achieved without deteriorating its ability to adsorb volatile organic compounds (VOC). In addition, effects of selectively controlling the size of the composite according to a product to be applied can be achieved by controlling the size of the seed particle. In addition, manufacturing competitiveness can be reinforced by reducing the amount of the organometal nanostructure used by introducing a method for preparing a composite by forming an organometal nanostructure only on the surface of the seed in contrast to methods that include simply mixing an organometal nanostructure and a binder in the conventional method for preparing a composite.
It will be understood that words or terms used in the description and claims of the present invention shall not be interpreted as the meaning defined in commonly used dictionaries. It will be understood that the words or terms should be interpreted as having a meaning that is consistent with their meaning in the technical idea of the invention, based on the principle that an inventor can properly define the meaning of the words to best explain the invention.
In the present invention, a weight average molecular weight can mean a relative value on a standard polystyrene (PS) specimen through gel permeation chromatography (GPC, waters breeze) using tetrahydrofuran (THF) as an eluent.
Hereinafter, the present invention will be explained in more detail.
The present invention provides a composite comprising a seed particle and a coating part formed on the seed particle, wherein the coating part comprises an organometal nanostructure and a binder, an average particle diameter of the seed particles is 150 μm to 3,350 μm, and an average particle diameter of the composite is 110% to 700% with respect to the average particle diameter of the seed particles.
Generally, an organometal nanostructure powder has low mutual agglomerating, and a process of mixing the organometal nanostructure powder with a binder or an additive to prepare a powder lump and applying a mechanical pressure has been required for preparing an organometal nanostructure composite. However, by the amount of the binder or additive added, the pores of the organometal nanostructure were blocked, or crystallinity was deteriorated. As a result, there were problems in that the surface area of the organometal nanostructure was largely reduced, its ability to adsorb volatile organic compounds (VOC) was degraded, and the production amount of a fine powder increased due to abrasion.
In order to solve such problems, the present invention introduces a seed-shell structure introducing seed particles and forming a coating part including an organometal nanostructure and a binder on the surface of the seed particle. The bonding force between the seed particle and the organometal nanostructure can complement the mutual agglomerating of an organometal nanostructure powder, and a process of injecting a binder or an additive to a process for preparing a composite and mechanically applying a pressure is not required. As a result, the properties of the conventional organometal nanostructure can be maintained during a process of converting the organometal nanostructure powder into a composite, and the production amount of a fine powder by abrasion can be reduced without deteriorating the ability to adsorb volatile organic compounds (VOC). In addition, by controlling the size of the seed particles, the size of a composite could be selectively controlled according to the products to apply, and since the organometal nanostructure is formed only on the surface of the seed particle, the amount of the organometal nanostructure used can be reduced, thereby improving manufacturing competitiveness.
According to an embodiment of the present invention, the type of the seed particle can be one or more selected from the group consisting of carbon nanotube, graphene, graphite, amorphous carbon, carbon black, activated carbon, a metal material, and an organometal nanostructure. In addition, considering that the organometal nanostructure has inferior ability to adsorb toluene among volatile organic compounds (VOC), the seed particle can be activated carbon that has excellent ability to adsorb toluene.
In addition, according to an embodiment of the present invention, the seed particle of the present invention can be spherical or pseudo-spherical. The term pseudo-spherical means a shape generally close to spherical including a shape of which cross-section passing through the center of gravity of the seed particle is an elliptical shape, or a shape in which the surface of the seed particle is uneven, and some are protruding, and can include an elliptical shape, an oval shape, or a spherical shape, an elliptical shape having protrusion, and an oval shape having protrusion. If the shape of the seed particle is spherical or pseudo-spherical, effects of increasing the coating amount of slurry on the surface of the seed particle can be achieved.
In addition, according to an embodiment of the present invention, an average particle diameter of the seed particles of the present invention can be 150 μm to 3,350 μm. Particularly, the average particle diameter of the seed particles can be 150 μm or more, 210 μm or more, 250 μm or more, 300 μm or more, 400 μm or more, 500 μm or more, 600 μm or more, 700 μm or more, 800 μm or more, 850 μm or more, or 1,000 μm or more, and 3,350 μm or less, 2,800 μm or less, 2,360 μm or less, 2,000 μm or less, 1,400 μm or less, or 1,200 μm or less. If the average particle diameter of the seed particles deviates from the range, the size of the average particle diameter of the composite finally prepared is difficult to efficiently control, and the adsorption and abrasion degree properties of the composite can be degraded.
In addition, the average particle diameter of the seed particles can be classified according to the use of the composite finally prepared. A composite including seed particles having an average particle diameter of 150 μm to 300 μm, has advantages in adsorbing indoor VOC due to a large surface area and could be used in products related to real life such as an air cleaner; and a composite including seed particles having an average particle diameter of 850 μm to 2,000 μm has a large distance between particles and advantages of not forming a differential pressure, and could be mainly used in a gas mask, or the like. In addition, a composite including seed particles having an average particle diameter of 2,000 μm to 3,350 μm has advantages of strong physical properties, particularly, excellent strength, and can be used in specific environments such as an adsorption tower in a manufacturing factory.
In addition, according to an embodiment of the present invention, the specific surface area per weight of the seed particles of the present invention can be 10 m2/g or more, 50 m2/g or more, 100 m2/g or more, 200 m2/g or more, 300 m2/g or more, or 400 m2/g or more and 1,000 m2/g or less, 900 m2/g or less, 800 m2/g or less, 700 m2/g or less, 600 m2/g or less, or 500 m2/g or less. If the above-described range is satisfied, effects of improving adsorption on volatile organic compounds can be achieved, while maintaining structural stability.
According to an embodiment of the present invention, the composite of the present invention can have particle size distribution such that particles having an average particle diameter of 150 μm to 600 μm are 80 wt % or more, and preferably, have a particle size distribution such that particles having an average particle diameter of 150 μm to 600 μm are 80 wt % or more, 85 wt % or more, 87 wt % or more, 91 wt % or more, or 95 wt % or more.
If the above-described range is satisfied, thermal stability and resistance to pressure are excellent, and effects of applying to various products can be achieved. Though a small amount of the organometal nanostructure powder is included, the production amount of a fine powder due to the abrasion of composite particles can be reduced without degrading the adsorption of volatile organic compounds, and effects of minimizing agglomerating phenomenon among composite particles can be achieved.
In addition, the average particle diameters of the seed particles and the composite can mean arithmetic particle diameters in particle size distribution measured by a sieve shaker. The arithmetic particle diameter could be measured as an intensity distribution particle diameter, a volume distribution particle diameter and a number distribution particle diameter, and among them, the volume distribution particle diameter is preferably measured. Particularly, the average particle diameters of the seed particles and the composite of the present invention can be a volume distribution particle diameter obtained by installing meshes step by step by the mesh size of 150 μm, 200 μm, 250 μm, 300 μm, 425 μm, 500 μm, 600 μm, and 850 μm using a sieve shaker, and measuring particle size distribution for each section.
In addition, the composite of the present invention can have a compressive fracture strength of 2.7 N or more, 3.0 N or more, or 3.3 N or more. If the above-described range is satisfied, the crystallinity and porous properties of an organometal nanostructure included in a composite can be maintained, thermal stability and resistance to pressure can be excellent without degrading ability to adsorb volatile organic compounds when compared to the conventional composite, and effects of applying to various products can be achieved.
According to an embodiment of the present invention, the composite of the present invention can include a binder for attaching the organometal nanostructure particles from each other. The binder can use an organic polymer or an inorganic material, for example, one or more selected from the group consisting of polyvinyl butyral (PVB), polyvinyl alcohol (PVA), polyvinyl chloride (PVC), polycarbonate (PC), polyamide (PA), polyoxymethylene (POM), polystyrene (PS), polyvinyl pyrrolidone (PVP), hydroxypropyl methylcellulose (HPMC) and acetylcellulose, which are organic polymers.
In addition, according to an embodiment of the present invention, the present invention can show the coating ratio of the coating part formed on the seed particle of 10% to 90%, 10% to 85%, or 40% to 80%, and the coating ratio can be calculated by Mathematical Formula 1 below.
Coating ratio={(mass of coated composite)/(mass of seed particles before coating)+(mass of organometal nanostructure before coating)}×100(%) [Mathematical Formula 1]
If the above-described range is satisfied, effects of reinforcing manufacturing competitiveness can be achieved by reducing the amount of an organometal nanostructure used without degrading the ability to adsorb volatile organic compounds.
The present invention provides a method for preparing a composite, comprising (S1) injecting seed particles into a fluid bed coating machine and making the seed particles flow and (S2) spraying a slurry comprising an organometal nanostructure and a binder onto the flowing seed particles in (S2).
Generally, a composite including an organometal nanostructure can be prepared as a composite by a conventional process of preparing an organometal nanostructure powder, mixing with a binder and applying a mechanical pressure. In order to prepare the organometal nanostructure powder, an organometal nanostructure can be filtered and washed, an organometal nanostructure slurry can be prepared and dried, and then, a milling process can be performed. In addition, in order to prepare the composite conventionally, the organometal nanostructure powder prepared can be mixed with a binder, a mechanical pressure can be applied, and a drying process can be performed. Accordingly, the whole process for preparing the composite conventionally is complicated, there are a lot of variables that can arise during the conventional process, and there are problems in that the quality of the composite prepared conventionally is difficult to maintain.
In order to solve such problems, the present invention introduces a preparation method of coating a slurry including an organometal nanostructure powder and a binder on the surface of a seed particle using a fluid bed coating machine, and performing drying and granulation simultaneously. According to the preparation method of the present invention, an organometal nanostructure slurry is prepared and dried, and though not involving a process of preparing an organometal nanostructure powder by a milling process, a granulation process could be performed using the organometal nanostructure filtered and washed. Accordingly, effects of simplifying the conventional process for preparing an organometal nanostructure powder could be achieved.
In addition, the composite of the present invention has a seed-shell structure formed by a slurry including an organometal nanostructure and a binder on the surface of a seed particle, and because of the bonding force of the seed particle and the organometal nanostructure, the application of a mechanical pressure and a separate drying process are not required during the preparation process of the composite. Accordingly, the conventional process for converting an organometal nanostructure powder into a composite can be simplified, the crystallinity and porous properties of the organometal nanostructure included in the composite prepared could be maintained, variables that can arise during processing can be minimized, and effects of maintaining the quality of the composite prepared constant can be achieved.
The selective control of the size of the composite has been difficult conventionally because of the preparation process of the conventional composite, but in the present invention, if the size of the seed particles could be controlled, the size of the composite can be selectively controlled according to the product to apply. Since the organometal nanostructure is formed only on the surface of the seed particle, the amount of the organometal nanostructure used could be reduced, and effects of reinforcing manufacturing competitiveness can be achieved.
The type of the seed particles of step (S1) is not specifically limited but can be one or more selected from the group consisting of carbon nanotube, graphene, graphite, amorphous carbon, carbon black, activated carbon, a metal material and an organometal nanostructure. In addition, considering that the organometal nanostructure has inferior ability to adsorb toluene among volatile organic compounds (VOC), the seed particle can be activated carbon that has excellent ability to adsorb toluene. In addition, the seed particles of step (S1) can be in a state of flow by the air flow in a fluid bed coating machine.
In step (S2), a slurry including an organometal nanostructure and a binder is sprayed on the surface of the seed particles that are in a state of flow in the fluid bed coating machine, to prepare a composite in which a coating part including an organometal nanostructure and a binder is formed on the surface of the seed particles.
The spraying in step (S2) can be a Wurster spray method by which the spraying is conducted upwards from a bottom of the fluid bed coating machine or a Tangential spray method by which the spraying is conducted from a middle of the fluid bed coating machine to a tangential direction. By the upward spray method through spray nozzles at the bottom of the fluid bed coating machine or the tangential direction spray method through spray nozzles at the middle, the agglomeration of the seed particles coated can be controlled, and effects of uniformly forming the coating part including the organometal nanostructure and the binder on the surface of the seed particle can be achieved.
The slurry can include the binder in 1 to 40 parts by weight, 1 to 20 parts by weight, or 2 to 15 parts by weight based on 100 parts by weight of the organometal nanostructure. If the above-described range is satisfied, the ratio of the organometal nanostructure coated on the surface of the seed particles can increase, while minimizing the loss of the organometal nanostructure, thereby achieving improving effects of ability to adsorb volatile organic compounds.
In addition, the binder included in the slurry can have a weight average molecular weight of 100,000 g/mol to 250,000 g/mol, 150,000 g/mol to 250,000 g/mol, or 160,000 g/mol to 210,000 g/mol. If the above-described range is satisfied, the adhesion of the organometal nanostructure can be maintained, and effects of increasing the ratio of the organometal nanostructure coated on the surface of the seed particles can be achieved.
Hereinafter, the present invention will be explained in particular through particular embodiments. However, the embodiments below are only for illustrating the present invention, and the scope of the present invention is not limited thereby.
74.16 g of a MIL-125(Ti) powder was prepared. Then, the MIL-125(Ti) powder and 59.33 g of polyvinyl alcohol (a solution in which 7.5 wt % of polyvinyl alcohol is dispersed in water) were mixed to prepare a slurry.
To a fluid bed coating machine, 600 g of activated carbon was injected, and the activated carbon was made to flow. Then, the slurry prepared was injected into the fluid bed coating machine, and the slurry was sprayed upwards through spray nozzles at the bottom of the fluid bed coating machine. The slurry was sprayed for 2 hours, and a sample of flowing activated carbon coated with the slurry at the surface thereof was obtained. The coated sample was fluidization dried at 80° C. for 1 hour to manufacture a composite specimen.
105.88 g of a MIL-125(Ti) powder was prepared. Then, the MIL-125(Ti) powder and 84.67 g of polyvinyl alcohol (a solution in which 7.5 wt % of polyvinyl alcohol is dispersed in water) were mixed to prepare a slurry.
To a fluid bed coating machine, 600 g of activated carbon was injected, and the activated carbon was made to flow. Then, the slurry prepared was injected into the fluid bed coating machine, and the slurry was sprayed upwards through spray nozzles at the bottom of the fluid bed coating machine. The slurry was sprayed for 2 hours, and a sample of flowing activated carbon coated with the slurry at the surface thereof was obtained. The coated sample was fluidization dried at 80° C. for 1 hour to manufacture a composite specimen.
300 g of a MIL-125(Ti) powder was prepared. Then, the MIL-125(Ti) powder and 240 g of polyvinyl alcohol (a solution in which 7.5 wt % of polyvinyl alcohol is dispersed in water) were mixed to prepare a slurry.
To a fluid bed coating machine, 300 g of activated carbon was injected, and the activated carbon was made to flow. Then, the slurry prepared was injected into the fluid bed coating machine, and the slurry was sprayed upwards through spray nozzles at the bottom of the fluid bed coating machine. The slurry was sprayed for 2 hours, and a sample of flowing activated carbon coated with the slurry at the surface thereof was obtained. The coated sample was fluidization dried at 80° C. for 1 hour to manufacture a composite specimen.
600 g of a MIL-125(Ti) powder was prepared. Then, the MIL-125(Ti) powder and 480 g of polyvinyl alcohol (a solution in which 7.5 wt % of polyvinyl alcohol is dispersed in water) were mixed to prepare a slurry.
To a fluid bed coating machine, 150 g of activated carbon was injected, and the activated carbon was made to flow. Then, the slurry prepared was injected into the fluid bed coating machine, and the slurry was sprayed upwards through spray nozzles at the bottom of the fluid bed coating machine. The slurry was sprayed for 4 hours, and a sample of flowing activated carbon coated with the slurry at the surface thereof was obtained. The coated sample was fluidization dried at 80° C. for 1 hour to manufacture a composite specimen.
300 g of a MIL-125(Ti) powder was prepared. Then, the MIL-125(Ti) powder and 240 g of polyvinyl alcohol (a solution in which 7.5 wt % of polyvinyl alcohol is dispersed in water) were mixed to prepare a slurry.
To a fluid bed coating machine, 300 g of activated carbon was injected, and the activated carbon was made to flow. Then, the slurry prepared was injected into the fluid bed coating machine, and the slurry was sprayed in a tangential direction through spray nozzles at the middle of the fluid bed coating machine. The slurry was sprayed for 2 hours, and a sample of flowing activated carbon coated with the slurry at the surface thereof was obtained. The coated sample was fluidization dried at 80° C. for 1 hour to manufacture a composite specimen.
600 g of a MIL-125(Ti) powder was prepared. Then, the MIL-125(Ti) powder and 480 g of polyvinyl alcohol (a solution in which 7.5 wt % of polyvinyl alcohol is dispersed in water) were mixed to prepare a slurry.
To a fluid bed coating machine, 150 g of activated carbon was injected, and the activated carbon was made to flow. Then, the slurry prepared was injected into the fluid bed coating machine, and the slurry was sprayed in a tangential direction through spray nozzles at the middle of the fluid bed coating machine. The slurry was sprayed for 2 hours, and a sample of flowing activated carbon coated with the slurry at the surface thereof was obtained. The coated sample was fluidization dried at 80° C. for 4 hour to manufacture a composite specimen.
100 g of a MIL-125(Ti) powder was injected into a high shear granulating (HSG) machine. Then, a mixture solution of 50 g of water and 80 g of polyvinyl alcohol (a solution in which 7.5 wt % of polyvinyl alcohol is dispersed in water) was injected into the high shear granulation machine to mix with the MIL-125(Ti) powder. Then, a granulation process was performed for 10 minutes under the conditions of a blade of 800 rpm and a chopper of 2,500 rpm. Then, drying was performed at 90° C. for 24 hours to manufacture a powder specimen.
100 g of a MIL-125(Ti) powder and 59.33 g of polyvinyl alcohol (a solution in which 6.0 wt % of polyvinyl alcohol is dispersed in water) were mixed to prepare a slurry. Then, the slurry prepared was injected into a syringe, melted at 220° C. and mixed to manufacture a specimen having a pellet shape with a size of 3 mm.
The activated carbon in Example 1 was used as a control specimen.
With respect to the specimens of the Examples and Comparative Examples, particle size distribution, a coating ratio and a BET surface area were measured, and the measurement results are shown in Table 1 below.
1) Measurement of particle size distribution: By using a standard sieve of an ASTM standard, the particles prepared in Example 1 were classified. More particularly, after stacking standard sieves having a mesh size of 850 μm, 600 μm, 300 μm, and 150 μm one by one, all the particles prepared in Example 1 was put on the uppermost, and the resultant was set on a sieve shaker. Classification was performed for 10 minutes with an amplitude of 20, each of particles remaining between the standard sieves were taken out and weighed, percentage was calculated, and the particle size distribution of the particles was computed. In addition, by the same method, the particle size distribution of the particles prepared in Examples 2 to 6 and Comparative Examples 1 to 4 was computed.
2) Measurement of coating ratio: The coating ratio was calculated through the equation of “{(mass of coated composite)/(mass of seed particles before coating)+(mass of organometal nanostructure before coating)}×100(%)”.
3) Measurement of BET surface area: Computation was performed from a nitrogen gas adsorption amount under a liquid nitrogen temperature (77K) using BELSORP-mino II of BEL Japan Inc.
With respect to the specimens of the Examples and Comparative Examples, adsorption amounts of formaldehyde that is a volatile organic compound and abrasion degrees were measured by the methods below. Measurement results are shown in Table 2.
1) Measurement of adsorption amount of volatile organic compound: A filter including each specimen of the Examples and Comparative Examples was put in a gas bag, and 15 ppm of formaldehyde was injected thereto, followed by sealing up and standing at room temperature for 2 hours. By using a gas detector tube method (FTM-5-2: 2004), the amount of formaldehyde remaining after 2 hours in the gas bag was measured. The adsorption amount of formaldehyde was calculated by subtracting the amount of formaldehyde remaining after 2 hours in the gas bag from initial 15 ppm of formaldehyde.
2) Measurement of abrasion degree: Each specimen of the Examples and Comparative Examples was injected into a beads machine including two types of zirconia (Zr) balls having average particle diameters of 5 mm and 10 mm. Then, the beads machine was shaken for 10 minutes, particles passing through a standard sieve with 150 μm were taken out, a weight was measured, and a percentage was calculated.
With respect to each specimen of Examples 4 and 6 and Comparative Example 3, a jig for compression was installed, the specimen was inserted between the jigs, a compressive force was applied in a speed of 1 mm/min to 10 mm/min from above, a load value transferred and applied by the force from above to the specimen was measured, a compressive fracture strength was measured based on the depth of moment when a pressure was 0.2 N. The compressive fracture strength was measured once more by the same method, and measurement results are shown in
Referring to Table 1 and Table 2, it could be confirmed that in the cases of Examples 1 to 6, in which composites were prepared by injecting seed particles into a fluid bed coating machine and making the seed particles flow, and by spraying a slurry including an organometal nanostructure and a binder on the seed particles in flow, in the process for preparing a composite according to the present invention, particles with an average particle diameter of 150 μm to 600 μm could be obtained in a high yield without increasing an abrasion degree and degrading the adsorption amount of volatile organic compounds when compared to Comparative Examples 1 to 3.
Particularly, it could be confirmed that the composites prepared from Examples 1 to 6 showed markedly high ratio of obtaining particles with an average particle diameter of 150 μm to 600 μm without increasing an abrasion degree and degrading the adsorption amount of volatile organic compounds when compared to the composite of Comparative Example 1 prepared by a high shear granulation (HSG) method, and showed a lower abrasion degree and increased adsorption amount of volatile organic compounds when compared to the composite of Comparative Example 2 manufactured into a pellet shape.
In addition, it could be confirmed that the composites prepared from Examples 1 to 6 showed similar particle size distribution as the activated carbon of Comparative Example 3, but the composites prepared from Examples 1 to 6 showed lower abrasion degrees by the bonding force of a seed and a coating part in contrast to the activated carbon of Comparative Example 3. In addition, referring to
From the results, the results could be confirmed that the composite prepared according to the method for preparing a composite according to the present invention has excellent structural stability, and particles with an average particle diameter of 150 μm to 600 μm could be obtained in a high yield without increasing a abrasion degree and degrading the adsorption amount of volatile organic compounds.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2021-0118057 | Sep 2021 | KR | national |
This application is a National Stage Application of International Application No. PCT/KR2022/013285 filed on Sep. 5, 2022, which claims the benefit of priority based on Korean Patent Application No. 10-2021-0118057, filed on Sep. 6, 2021, the entire contents of which are incorporated herein by reference.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2022/013285 | 9/5/2022 | WO |
