Patent Application
20250002413
The present invention claims the priority of Chinese patent application No. 202211077772.6, filed with China National Intellectual Property Administration on Sep. 5, 2022, and entitled “SUPERHYDROPHOBIC SELF-LUMINOUS CONCRETE MATERIAL FOR 3D PRINTING AND METHOD FOR PREPARING SAME”, the entire contents of which are incorporated into herein by reference.
The present invention belongs to the field of building materials, and particularly relates to a superhydrophobic self-luminous concrete material for 3D printing and a method for preparing the same.
The application of 3D printing technology in the field of construction engineering has gradually received widespread attention at home and abroad. Different from ordinary concrete, concrete for 3D printing for construction needs to have good thixotropy, that is, when this concrete is extruded, it gains good fluidity by mechanical vibration so as to facilitate printing, and after this concrete is extruded from the printing head, the mechanical vibration disappears, and the concrete immediately loses the fluidity and remains the shape to be printed. However, the current ordinary concrete or high-performance concrete for construction cannot meet this demand.
The synergistic design of the superhydrophobic surface coating and the self-luminous material can give a self-cleaning function to the surface of the self-luminous cement pavement material and improve the water resistance of the self-luminous cement pavement material. In particular, the superhydrophobic self-luminous material can play the role of indication, beautification and illumination in road signs, road dividers and sidewalks, thus being a typical energy-saving environmentally-friendly building decoration material. The superhydrophobic self-luminous material has long service life and stable luminous performance, and can effectively save power resources when used for low-brightness illumination, which is in line with the concept of green economic development of the society and has wide application prospects.
According to most of the existing methods for preparing superhydrophobic self-luminous concrete, cement, luminous powder and reflective powder are sufficiently preblended according to a certain ratio, and self-luminous concrete materials with ingredients in different ratios are prepared by changing the amounts of the luminous powder and the reflective powder. After the curing is completed, a hydrophobic material is applied as a coating to the surface of the self-luminous concrete. The traditional superhydrophobic self-luminous concrete requires long preparation time and complex operations, and can hardly be used for preparing fine and special-shaped components in construction.
In order to overcome the defects in the prior art, an object of the present invention is to provide a superhydrophobic self-luminous concrete material for 3D printing and a method for preparing the same. The concrete material provided by the present invention can be used for 3D printing, and can significantly improve the tensile strength and impact toughness of the material and enhance the luminous ability and reflective effect of the material.
In order to achieve the above object, the technical solutions of the present invention are as follows:
In one aspect, a superhydrophobic self-luminous concrete material for 3D printing includes a surface layer and a base layer.
The base layer includes the following ingredients in parts by weight:
The surface layer is a superhydrophobic coating.
In another aspect, a method for preparing a superhydrophobic self-luminous concrete material for 3D printing includes:
The superhydrophobic coating is obtained by adding a fluorosilane material for fluorination during hydrolysis of tetraethyl orthosilicate.
The present invention has the following beneficial effects:
By combining 3D printing with the superhydrophobic self-luminous concrete material, the characteristics of energy saving, environment friendliness, high efficiency and low consumption of the 3D printing can be highlighted, and fine and special-shaped components that requires the properties of the superhydrophobic self-luminous concrete material in practical engineering can be prepared efficiently. The present invention improves mechanical properties of concrete such as tensile resistance, and has a high practical application value.
The concrete provided by the present invention can be used for 3D printing, and can significantly improve the tensile strength and impact toughness of the material and enhance the luminous ability and reflective effect of the material. Moreover, the concrete material provided by the present invention has the characteristics of short setting time and high early strength. The addition of the hydroxypropyl methyl cellulose ether can improve viscosity, extrudability and constructability. The addition of the metal filler Eu(DBM)3phen can improve the tensile strength and impact strength of the concrete material, the tensile strength is improved by 2.45%, and the impact strength is improved by 11.97%. The metal filler is luminous, and can effectively improve mechanical properties of the material.
It should be noted that, the following detailed descriptions are all exemplary, and are intended to provide further descriptions of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those usually understood by an ordinary person skilled in the art to which the present invention belongs.
It should be noted that the terms used herein are merely used for describing specific embodiments, and are not intended to limit exemplary embodiments of the present invention. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise. In addition, it should further be understood that terms “comprise” and/or “include” used in this specification indicate that there are features, steps, operations, devices, components, and/or combinations thereof.
In view of the problems of high requirements of the current 3D printing concrete technology for properties of concrete, long preparation time and complex operations of the superhydrophobic self-luminous concrete, and incapability of preparing fine and special-shaped components in construction, the present invention provides a superhydrophobic self-luminous concrete material for 3D printing and a method for preparing the same.
A typical embodiment of the present invention provides a superhydrophobic self-luminous concrete material for 3D printing, including a surface layer and a base layer.
The base layer includes the following ingredients in parts by weight:
The surface layer is a superhydrophobic coating.
In some examples of this embodiment, the base layer includes the following ingredients in parts by weight:
In some examples of this embodiment, the cement includes 82-100 wt % of ordinary Portland cement and 0-18 wt % of sulfoaluminate cement. Preferably, the ordinary Portland cement is of grade 42.5, and the sulfoaluminate cement is of grade 52.5. The mixture of the two types of cement can ensure the material to have high early strength and age strength.
In some examples of this embodiment, the water reducing agent is a polycarboxylic acid water reducing agent, which has a water reducing rate of 32% and is used for regulating the fluidity and extrudability of the material.
In some examples of this embodiment, the cellulose ether is hydroxypropyl methyl cellulose ether having a viscosity of 200 Pa·s, and as a viscosity modifier, can improve the extrudability and constructability.
In some examples of this embodiment, the fiber includes polypropylene fiber and polyvinyl alcohol fiber.
Preferably, the polypropylene fiber has a length-to-diameter ratio of 110-130, preferably 120.
Preferably, the polyvinyl alcohol fiber has a length-to-diameter ratio of 190-200, preferably 194.
Preferably, the polypropylene fiber has a diameter of 40-60 μm, preferably 50 μm.
Preferably, the polyvinyl alcohol fiber has a diameter of 30-40 μm, preferably 31 μm.
Preferably, a mass ratio of the polypropylene fiber to the polyvinyl alcohol fiber is 1-5:1-2, preferably 4:1.
The addition of the fiber to the concrete material can improve the toughness of the material, such that the material is suitable for 3D printing technology.
In some examples of this embodiment, the metal filler is Eu(DBM)3phen. The luminous organometallic complex Eu(DBM)3phen is used as a filler to modify the concrete material, and can further improve the self-luminous ability of concrete and the tensile strength and impact strength of the material.
Preferably, a mass ratio of the metal filler to the polypropylene fiber is 0.5-1:99.0-99.5, preferably 0.5:99.5. The metal filler and the polypropylene fiber synergically improve the mechanical properties of the concrete material. Moreover, when the metal filler and the polypropylene fiber are added according to this mass ratio, the tensile strength and impact strength of the concrete material are greatly improved.
In some examples of this embodiment, the luminous powder is rare earth greenish-yellow luminous powder, preferably SrAl2O4:Eu2+,Dy3+, and has a particle size of 500-700 mesh, preferably 600 mesh. The addition of the luminous powder can prolong the self-luminous time of the concrete material, and the afterglow time can reach more than 8 h with respect to the minimum visible brightness of human eyes 0.32 med/m2.
In some examples of this embodiment, the reflective powder is gray reflective powder with glass as the main powder material, the main chemical component of which is SiO2. The reflective powder has a particle size of 200 mesh. After being added, the reflective powder can make the concrete material have a retroreflective effect by utilizing the high refractiveness of microbeads.
In some examples of this embodiment, the metakaolin is obtained by calcination of kaolin at 850° C. The main chemical components of the metakaolin are SiO2 and Al2O3. The metakaolin can significantly improve the static yield stress of the material and reduce the structural deformation.
In some examples of this embodiment, the superhydrophobic coating is obtained by adding a fluorosilane material for fluorination during hydrolysis of tetraethyl orthosilicate, and is preferably a fluorosilane hydrophobic coating.
Another typical embodiment of the present invention provides a method for preparing a superhydrophobic self-luminous concrete material for 3D printing described above, including:
The superhydrophobic coating is obtained by adding a fluorosilane material for fluorination during hydrolysis of tetraethyl orthosilicate.
In some examples of this embodiment, the time of stirring may be flexibly adjusted according to the specific mixture ratio of the material.
Preferably, the stirring in (3) is carried out for 180-240 s.
Preferably, the stirring in (4) is carried out for 300-600 s.
In order to make those skilled in the art understand the technical solutions of the present invention more clearly, the technical solutions of the present invention will be described in detail in conjunction with specific examples.
The polypropylene fiber used in the following examples has a length-to-diameter ratio of 120 and a diameter of 50 μm; and the polyvinyl alcohol fiber has a length-to-diameter ratio of 194 and a diameter of 31 μm. The superhydrophobic coating used in the following examples is a commercially available fluorosilane hydrophobic coating.
The superhydrophobic self-luminous concrete material for 3D printing includes the following ingredients in parts by weight: 1000 parts of 42.5 ordinary Portland cement, 180 parts of 52.5 sulfoaluminate cement, 1000 parts of quartz sand, 50 parts of silica fume, 340 parts of water, 10 parts of polycarboxylic acid water reducing agent, 1 part of hydroxypropyl methyl cellulose ether, 2 parts of defoamer, 3.2 parts of polypropylene fiber, 0.8 part of polyvinyl alcohol fiber, 75 parts of luminous powder, 30 parts of reflective powder, 15 parts of metakaolin and 0.016 part of metal filler Eu(DBM)3phen.
The method for preparing a superhydrophobic self-luminous concrete material for 3D printing includes the following steps:
The superhydrophobic self-luminous concrete material for 3D printing includes the following ingredients in parts by weight: 1000 parts of 42.5 ordinary Portland cement, 180 parts of 52.5 sulfoaluminate cement, 1000 parts of quartz sand, 50 parts of silica fume, 340 parts of water, 10 parts of polycarboxylic acid water reducing agent, 1 part of hydroxypropyl methyl cellulose ether, 2 parts of defoamer, 3.2 parts of polypropylene fiber, 0.8 part of polyvinyl alcohol fiber, 75 parts of luminous powder, 30 parts of reflective powder, 15 parts of metakaolin and 0.032 part of metal filler Eu(DBM)3phen.
The method for preparing a superhydrophobic self-luminous concrete material for 3D printing includes the following steps:
This comparative example was different from Example 1 in that no metal filler Eu(DBM)3phen was added.
This comparative example was different from Example 1 in that no polypropylene was added. This concrete had low formability.
The superhydrophobic self-luminous concrete materials obtained by the methods in Examples 1 to 2 and Comparative Examples 1 and 3 to 4 were tested for the influence of the metal filler on mechanical properties of polypropylene. The results are shown in Table 1 below.
As can be seen from Table 1, when the mass percentages of addition amount of polypropylene and metal filler is polypropylene:metal filler=99.5%:0.5%, the superhydrophobic self-luminous concrete material has the best mechanical properties. Compared with the mechanical properties of the superhydrophobic self-luminous concrete material in which no metal filler is added, the tensile strength is improved by 2.45%, and the impact strength is improved by 11.97%. As a result, the addition of the metal filler Eu(DBM)3phen can improve the tensile strength and impact strength of the concrete material. The metal filler is luminous, and can effectively improve the mechanical properties of the material
The superhydrophobic self-luminous concrete materials obtained by the methods in Examples 1 to 2 and Comparative Examples 1 and 3 to 4 were tested for their initial setting time and final setting time. The results show that the initial setting time of the superhydrophobic self-luminous concrete is 20-120 min, and the final setting time is 60-180 min.
The foregoing descriptions are merely preferred examples of the present invention, but are not intended to limit the present invention. A person skilled in the art may make various alterations and variations to the present invention. Any modification, equivalent replacement, or improvement made and the like within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202211077772.6 | Sep 2022 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2023/074719 | 2/7/2023 | WO |
