Method for producing building material having photocatalyst, and building material

Abstract

The invention relates to a method for producing a building material having a photocatalyst and a building material. The manufacturing method comprises the following steps: forming a base material of the building material; concave-convex patterns are formed on the outer surface of the base material; a photocatalytic layer covering the concave-convex patterns is formed on the base material, and a photocatalyst is contained in the photocatalytic layer. The photocatalytic layer containing the photocatalyst is arranged on the outer surface of the base material, so that the photocatalyst can be in full contact with light, and the utilization rate of the photocatalyst is increased; besides, the concave-convex patterns are formed on the outer surface of the base material, so that the area of the photocatalytic layer can be increased, light rays can be scattered at the concave-convex patterns, the contact probability of the photocatalyst and the light rays is further increased, and the treatment effect of the building material on automobile exhaust is remarkably improved. In addition, the manufacturing method of the building material is simple in process, does not need excessive auxiliaries and equipment, and is relatively low in manufacturing cost.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection, in particular to a method for manufacturing a building material with a photocatalyst and the building material. Background Art

[0002] Automobile exhaust is an important source of air pollution, and its main components include nitrogen oxides, carbon dioxide, carbon monoxide, hydrocarbons, etc. These components not only cause environmental problems such as acid rain and ozone layer depletion, but also cause serious harm to human health, such as respiratory diseases and cardiovascular diseases. Therefore, it is particularly important to scientifically and effectively control automobile exhaust.

[0003] In recent years, the use of photocatalysts to treat automobile exhaust has received widespread attention. Its working principle is to use the redox ability of photocatalysts under light conditions to purify automobile exhaust. Since photocatalysts have the advantages of high efficiency, rapidity, environmental protection and renewability, photocatalysts can be added to building materials (such as asphalt) to purify automobile exhaust. For example, Chinese invention patent application CN108752951A discloses a method for preparing an asphalt material with the function of decomposing automobile exhaust. The manufacturing method includes the following steps: preparing magnesium oxide modified zeolite; mixing, filtering, drying, grinding and sieving magnesium oxide modified zeolite with nano titanium dioxide; melting and modifying the matrix asphalt; and evenly adding the sieved magnesium oxide modified zeolite and nano titanium dioxide mixture to the modified matrix asphalt so that the nano titanium dioxide is evenly dispersed in the matrix asphalt.

[0004] However, the above manufacturing method has the following defects: (1) Titanium dioxide is evenly dispersed in the matrix asphalt, resulting in the titanium dioxide inside the matrix asphalt being unable to fully contact light, the utilization rate of titanium dioxide is low, and the effect of treating exhaust gas is not good. (2) The manufacturing process is relatively complicated, and the manufacturing process requires more additives and equipment, resulting in high manufacturing costs.

[0005] Therefore, this field needs a new technical solution to solve the above problems. Summary of the invention

[0006] In order to solve or improve to a certain extent the technical problems of poor treatment effect and high manufacturing cost of building materials with tail gas treatment function in the prior art, the present invention provides a method for manufacturing building materials with photocatalysts. The manufacturing method comprises: forming a substrate of the building material; forming a concave-convex pattern on the outer surface of the substrate; forming a photocatalytic layer covering the concave-convex pattern on the substrate, wherein the photocatalytic layer contains a photocatalyst.

[0007] It can be understood by those skilled in the art that the manufacturing method of the building material with photocatalyst of the present invention first forms the substrate of the building material; then, forms a concave-convex pattern on the outer surface of the substrate (or "light incident surface"); then, forms a photocatalytic layer covering the concave-convex pattern on the substrate (including covering the concave-convex pattern in whole or in part), wherein the photocatalytic layer contains a photocatalyst. Therefore, the present invention arranges the photocatalytic layer containing the photocatalyst on the outer surface of the substrate, so that the photocatalyst can be fully contacted with the light, thereby improving the utilization rate of the photocatalyst; in addition, forming the concave-convex pattern on the outer surface of the substrate can not only increase the area of ​​the photocatalytic layer, but also cause the light to scatter at the concave-convex pattern, further increase the probability of the photocatalyst contacting with the light, and significantly improve the treatment effect of the building material on polluted gas (such as automobile exhaust). Furthermore, forming the concave-convex pattern on the outer surface of the substrate can also improve the surface roughness of the building material, and avoid the substrate surface being too smooth due to the setting of the photocatalytic layer. In addition, the manufacturing method of the building material of the present invention is simple in process, does not require too many additives and equipment, and has a low manufacturing cost.

[0008] In the preferred technical solution of the manufacturing method of the building material with photocatalyst, the concentration of the photocatalyst gradually increases in the direction away from the substrate. By setting the concentration of the photocatalyst to gradually increase in the direction away from the substrate, the photocatalyst with a higher concentration is arranged on the outside, so that it can contact with light more efficiently, further improving the utilization rate of the photocatalyst.

[0009] In the preferred technical solution of the manufacturing method of the above-mentioned building material, the photocatalytic layer also includes an adsorption carrier mixed with the photocatalyst. The provision of the adsorption carrier can not only make the photocatalyst evenly dispersed to ensure that it is fully exposed to light, but also can better adsorb automobile exhaust gas, facilitating the redox reaction between the photocatalyst and automobile exhaust gas.

[0010] In the preferred technical solution of the manufacturing method of the building material with photocatalyst, the material of the adsorption carrier is one or more of zeolite, graphene and activated carbon. Through the above settings, the types of adsorption carriers can be enriched to meet the differentiated needs of users.

[0011] In the preferred technical solution of the manufacturing method of the building material with photocatalyst, the material of the photocatalyst is one or more of titanium dioxide, tin oxide, zinc oxide, graphite carbon nitride and tourmaline. Through the above settings, the types of adsorption carriers and photocatalysts can be enriched to meet the differentiated needs of users.

[0012] In the preferred technical solution of the manufacturing method of the building material with photocatalyst, the photocatalytic layer is doped with corundum. Doping a proper amount of corundum in the photocatalytic layer can not only further improve the surface roughness of the building material, but also improve the wear resistance and strength of the photocatalytic layer, thereby increasing the service life of the building material.

[0013] In the preferred technical solution of the above-mentioned method for manufacturing building materials with photocatalysts, the material of the substrate is one or more of asphalt, concrete, steel, stone, wood, brick and glass, so as to enrich the types of substrates and meet the differentiated needs of users.

[0014] In the preferred technical solution of the manufacturing method of the building material with photocatalyst, the concave-convex pattern is formed by one or more of embossing, casting, sandblasting and mechanical processing to enrich the processing technology of the concave-convex pattern.

[0015] In the preferred technical solution of the method for manufacturing the building material with photocatalyst, the photocatalytic layer is fixed on the substrate by a coating process, so that the photocatalyst can be conveniently and stably fixed on the substrate.

[0016] In order to solve or improve to a certain extent the technical problems of poor treatment effect and high manufacturing cost of building materials with tail gas treatment function in the prior art, the present invention provides a building material. The building material is processed by any of the above-mentioned methods for manufacturing building materials with photocatalysts, and the building material comprises: a substrate, a concave-convex pattern is provided on the outer surface of the substrate; and a photocatalytic layer, the photocatalytic layer covers the concave-convex pattern, wherein the photocatalytic layer contains a photocatalyst.

[0017] It can be understood by those skilled in the art that the building material of the present invention includes a substrate and a photocatalytic layer. Among them, a concave-convex pattern is provided on the outer surface of the substrate, and the photocatalytic layer containing a photocatalyst covers the concave-convex pattern. In this way, the building material of the present invention can make the photocatalyst arranged on the outer surface of the substrate fully contact with light, thereby improving the utilization rate of the photocatalyst. In addition, the concave-convex pattern is provided on the outer surface of the substrate, which can not only increase the area of ​​the photocatalytic layer, but also cause light to scatter at the concave-convex pattern, further increase the probability of the photocatalyst contacting with light, significantly improve the treatment effect of the building material on automobile exhaust, and can also improve the surface roughness of the building material, avoiding the substrate surface being too smooth due to the provision of the photocatalytic layer. In addition, the manufacturing method of the building material of the present invention is simple in process, does not require too many additives and equipment, and has a low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0019] Figure 1 is a schematic flow chart of an embodiment of a method for manufacturing a building material having a photocatalyst according to the present invention;

[0020] Figure 2 It is a schematic structural diagram of an embodiment of the building material of the present invention.

[0021] List of reference numerals:

[0022] 100. Building material; 110. Base material; 110a. Outer surface; 110b. Inner surface; 111. Concavo-convex pattern; 120. Photocatalytic layer; 121. Photocatalyst; 122. Adsorption carrier; 123. Corundum. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0024] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "front", "back", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0025] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In order to solve or improve to a certain extent the technical problems of poor treatment effect and high manufacturing cost of building materials with exhaust gas treatment function in the prior art, the present invention provides a method for manufacturing a building material 100 with a photocatalyst 121. The manufacturing method comprises: forming a substrate 110 of the building material 100 (step S1); forming a concave-convex pattern 111 on the outer surface 110a of the substrate 110 (step S2); forming a photocatalytic layer 120 covering the concave-convex pattern 111 on the substrate 110, wherein the photocatalytic layer 120 contains a photocatalyst 121 (step S3).

[0027] Figure 1FIG. 1 is a schematic flow chart of an embodiment of a method for manufacturing a building material having a photocatalyst according to the present invention. Figure 1 As shown, in one or more embodiments, the manufacturing method of the building material 100 with the photocatalyst 121 of the present invention first performs step S1, that is, forming the substrate 110 of the building material 100. It should be noted that the building material 100 can be applied in the fields of roads, bridges, viaducts, airports, buildings, etc. according to actual needs. In one or more embodiments, the material of the substrate 110 is one or more of asphalt, concrete, steel, stone, wood, brick and glass. For example, the material of the substrate 110 is heavy traffic asphalt AH-90, AH-110, AH-130, etc. Alternatively, the material of the substrate 110 is ordinary concrete with an apparent density of 2000 kg-2600 kg per cubic meter. Alternatively, the material of the substrate 110 is granite, marble, bluestone, artificial stone or other suitable stone. Alternatively, the material of the substrate 110 is logs, artificial boards or other suitable wood. Alternatively, the material of the substrate 110 is clay bricks, shale bricks, lime sand bricks or other suitable bricks. Alternatively, the material of the substrate 110 is flat glass, safety glass, decorative glass or other suitable glass. Alternatively, the substrate 110 may also be a composite material composed of any two or more of asphalt, concrete, steel, stone, wood, brick and glass. In addition, the specific method of forming the substrate 110 of the building material 100 can be adjusted according to actual needs, such as refining and extracting crude oil to prepare asphalt, etc., which will not be repeated here.

[0028] like Figure 1As shown, in one or more embodiments, after step S1 is completed, the manufacturing method of the building material 100 with the photocatalyst 121 of the present invention performs step S2, that is, forming a concave-convex pattern 111 on the outer surface 110a of the substrate 110. In this article, unless there is a clear statement to the contrary, "the outer surface 110a of the substrate 110" refers to the interface where the substrate 110 is in direct contact with the external environment, such as the top surface of roads, bridges, elevated roads and airports, the outer wall surface and roof surface of buildings, etc. The concave-convex pattern 111 can select a suitable processing technology according to the material of the substrate 110, such as a stamping process, a casting process, a sandblasting process, a mechanical processing, or a combination of any two or more of the above processing technologies. The specific form of the concave-convex pattern 111 is not limited, such as a wave shape, a round shape, a spiral shape, a copper coin shape, etc. The setting of the concave-convex pattern 111 can significantly increase the area of ​​the photocatalytic layer 120, increase the contact probability of the photocatalyst 121 in the photocatalytic layer 120 with light, and improve the treatment ability of polluted gases (such as automobile exhaust). In addition, the concavo-convex pattern 111 can also improve the surface roughness of the substrate 110 and enhance its performance. For example, when the substrate 110 is used on the road, the concavo-convex pattern 111 can increase the friction between the car and the road to ensure the safety of the car. Furthermore, the concavo-convex pattern 111 can also improve the aesthetics of the substrate 110 and enrich the design elements of a beautiful city. It should be pointed out that the specific size, cross-sectional shape, and arrangement of the concavo-convex pattern 111 can be adjusted according to actual needs.

[0029] It should be noted that, regarding step S1 and step S2, although the present application describes that step S1 is performed first and step S2 is performed later, this is only an example. Without departing from the basic principles of the present invention, those skilled in the art can adjust the execution order of step S1 and step S2 as needed, for example, first perform step S2 and then perform step S1 (i.e., first form the concave-convex pattern 111 on the outer surface 110a of the substrate 110, and then process the substrate 110 of suitable specifications and shape); or perform both at the same time (i.e., the concave-convex pattern 111 and the substrate 110 are integrally formed), etc. The adjusted scheme is equivalent to the technical scheme described in the present application, and therefore will also fall within the protection scope of the present invention.

[0030] like Figure 1As shown, in one or more embodiments, after step S2 is completed, the method for manufacturing the building material 100 having the photocatalyst 121 of the present invention proceeds to step S3, i.e., forming a photocatalytic layer 120 covering the concave-convex pattern 111 on the substrate 110, wherein the photocatalytic layer 120 contains the photocatalyst 121. In one or more embodiments, the photocatalytic layer 120 covers the entire concave-convex pattern 111. In other words, the photocatalytic layer 120 is arranged on the entire outer surface 110a of the substrate 110. Alternatively, the photocatalytic layer 120 may also cover part of the concave-convex pattern 111. For example, the photocatalytic layer 120 is only filled in the grooves of the concave-convex pattern 111; or a part of the photocatalytic layer 120 is located in the grooves of the concave-convex pattern 111, and another part of the photocatalytic layer 120 is located outside the grooves of the concave-convex pattern 111. Through the above arrangement, the photocatalytic layer 120 can be arranged on the outer surface 110a of the substrate 110, so that the photocatalyst 121 in the photocatalytic layer 120 is fully in contact with light, thereby improving the utilization rate of the photocatalyst 121. In addition, covering the photocatalytic layer 120 on the concave-convex pattern 111 of the substrate 110 can not only increase the area of ​​the photocatalytic layer 120, but also cause light to be scattered at the concave-convex pattern 111, further increasing the probability of the photocatalyst 121 contacting light, and significantly improving the treatment effect of the building material 100 on polluted gases (such as automobile exhaust).

[0031] In one or more embodiments, the photocatalytic layer 120 is fixed on the substrate 110 through a coating process, so that the photocatalyst 121 can be conveniently and stably fixed on the substrate 110. It should be noted that the specific parameters of the coating process can be adjusted according to actual needs, such as coating pressure, coating width, coating speed, coating times, drying temperature, drying time, etc.

[0032] In one or more embodiments, the concentration of the photocatalyst 121 gradually increases in a direction away from the substrate 110. In other words, the concentration of the photocatalyst 121 on the outside of the photocatalytic layer 120 is higher than the concentration of the photocatalyst 121 on the inside. In this way, the photocatalyst 121 with a higher concentration is arranged on the outside, and can be more efficiently contacted with light, further improving the utilization rate of the photocatalyst 121. It should be noted that the concentration of the photocatalyst 121 can be adjusted by controlling the parameters of a single coating process, and can also be achieved by changing the concentration of the photocatalyst 121 during multiple coatings.

[0033] In one or more embodiments, the material of the photocatalyst 121 is titanium dioxide. For example, a sol-gel method can be used to mix butyl titanate or other titanium sources with a suitable solvent such as anhydrous ethanol, and hydrolysis and condensation reactions can occur under certain conditions to generate nano titanium dioxide sol. An appropriate amount of surfactant can be added during the reaction to improve the stability and dispersibility of the sol. The photocatalytic reaction of titanium dioxide only requires ultraviolet light irradiation or exposure to sunlight, and the reaction conditions are mild. In addition, titanium dioxide has many advantages such as high conversion efficiency, fast degradation rate, wide degradation range, good stability, non-toxicity and pollution-free. Alternatively, the photocatalyst 121 can also be made of tin oxide, zinc oxide, graphite phase carbon nitride, tourmaline or other suitable materials. Furthermore, the material of the photocatalyst 121 can also be a mixture of any two or more of titanium dioxide, tin oxide, zinc oxide, graphite phase carbon nitride, and tourmaline.

[0034] In one or more embodiments, the photocatalytic layer 120 further includes an adsorption carrier 122 mixed with the photocatalyst 121. The provision of the adsorption carrier 122 can not only evenly disperse the photocatalyst 121, prevent the photocatalyst 121 from agglomerating, and ensure that it is fully in contact with light, but also better adsorb polluted gases (such as automobile exhaust) to facilitate the redox reaction between the photocatalyst 121 and the polluted gases.

[0035] In one or more embodiments, the material of the adsorption carrier 122 is zeolite. For example, the zeolite molecular sieve is first cleaned, dried and activated to improve its adsorption performance and the effect of being a carrier of the photocatalyst 121; then, the pretreated zeolite molecular sieve is added to the nano-titanium dioxide sol, and the zeolite molecular sieve is fully adsorbed to the nano-titanium dioxide particles in the sol by stirring, standing, etc. Alternatively, the adsorption carrier 122 may also be made of graphene, activated carbon or other suitable materials. Furthermore, the adsorption carrier 122 may also be a mixture of any two or more of zeolite, graphene, and activated carbon.

[0036] In one or more embodiments, the photocatalytic layer 120 is further doped with corundum 123. Doping an appropriate amount of corundum 123 in the photocatalytic layer 120 can not only further improve the surface roughness of the building material 100, but also improve the wear resistance and strength of the photocatalytic layer 120, thereby increasing the service life of the building material 100. The corundum 123 can be attached to the photocatalytic layer 120 through a sandblasting process, or can be mixed in a nano-titanium dioxide sol and then fixed on the substrate 110 through a coating process.

[0037] Figure 2 Schematic diagram of the structure of the embodiment of the building material of the present invention. Figure 2The embodiment of the building material 100 of the present invention is described in detail. It should be noted that the building material 100 of the present invention can be processed by the manufacturing method of the building material 100 having the photocatalyst 21 described in any of the above embodiments.

[0038] like Figure 2 As shown, in one or more embodiments, the building material 100 of the present invention includes a substrate 110 and a photocatalytic layer 120. The substrate 110 has an outer surface 110a and an inner surface 110b opposite to each other. Figure 2 In the orientation shown, the "outer surface 110a" is the upper surface of the substrate 110, and the "inner surface 110b" is the lower surface of the substrate 110. The material of the substrate 110 can be but is not limited to asphalt, concrete, steel, stone, wood, brick and glass. A concave-convex pattern 111 is provided on the outer surface 110a of the substrate 110. The concave-convex pattern 111 can select a suitable processing technology according to the material of the substrate 110, such as a stamping process, a casting process, a sandblasting process, a mechanical processing, or a combination of any two or more of the above processing technologies. The specific form of the concave-convex pattern 111 is not limited, such as a wave shape, a circular shape, a spiral shape, a coin shape, etc. In addition, the specific size, cross-sectional shape, arrangement method, etc. of the concave-convex pattern 111 can be adjusted according to actual needs.

[0039] Continue to see Figure 2 In one or more embodiments, the photocatalytic layer 120 covers the entire concavo-convex pattern 111. Alternatively, the photocatalytic layer 120 may also cover part of the concavo-convex pattern 111. The photocatalytic layer 120 may be fixed on the substrate 110 by a coating process or other suitable process. In one or more embodiments, the concentration of the photocatalyst 121 gradually increases in a direction away from the substrate 110. The material of the photocatalyst 121 includes but is not limited to titanium dioxide, tin oxide, zinc oxide, graphite carbon nitride, and tourmaline. In one or more embodiments, the photocatalytic layer 120 also includes an adsorption carrier 122 mixed with the photocatalyst 121. The material of the adsorption carrier 122 includes but is not limited to zeolite, graphene, and activated carbon. In one or more embodiments, the photocatalytic layer 120 is also doped with corundum 123 to improve the surface roughness of the building material 100, and may also improve the wear resistance and strength of the photocatalytic layer 120, thereby extending the service life of the building material 100.

[0040] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for producing a building material (100) having a photocatalyst (121), characterized in that: The manufacturing method comprises: A substrate (110) forming the building material (100); forming a concave-convex pattern (111) on the outer surface (110a) of the substrate (110); A photocatalytic layer (120) is formed on the substrate (110) to cover the concavo-convex pattern (111), wherein the photocatalytic layer (120) contains a photocatalyst (121).

2. The method for manufacturing the building material (100) having a photocatalyst (121) according to claim 1, characterized in that: The concentration of the photocatalyst (121) gradually increases in a direction away from the substrate (110).

3. The method for manufacturing a building material (100) having a photocatalyst (121) according to claim 1 or 2, characterized in that: The photocatalytic layer (120) further comprises an adsorption carrier (122) mixed with the photocatalyst (121).

4. The method for manufacturing a building material (100) having a photocatalyst (121) according to claim 3, characterized in that: The material of the adsorption carrier (122) is one or more of zeolite, graphene and activated carbon.

5. The method for manufacturing the building material (100) having a photocatalyst (121) according to claim 3, characterized in that: The material of the photocatalyst (121) is one or more of titanium dioxide, tin oxide, zinc oxide, graphite carbon nitride and tourmaline.

6. The method for manufacturing the building material (100) having a photocatalyst (121) according to claim 1, characterized in that: The photocatalytic layer (120) is doped with corundum (123).

7. The method for manufacturing a building material (100) having a photocatalyst (121) according to claim 1, characterized in that: The material of the substrate (110) is one or more of asphalt, concrete, steel, stone, wood, brick and glass.

8. The method for manufacturing a building material (100) having a photocatalyst (121) according to claim 1, characterized in that: The concave-convex pattern (111) is formed by one or more of a stamping process, a casting process, a sandblasting process and a machining process.

9. The method for manufacturing a building material (100) having a photocatalyst (121) according to claim 1, characterized in that: The photocatalytic layer (120) is fixed on the substrate (110) through a coating process.

10. A building material (100), characterized in that The building material (100) is processed according to the method for manufacturing a building material (100) having a photocatalyst (121) according to any one of claims 1 to 9, and the building material (100) comprises: A substrate (110), wherein a concave-convex pattern (111) is provided on an outer surface (110a) of the substrate (110); and A photocatalytic layer (120), the photocatalytic layer (120) covers the concave-convex pattern (111), wherein the photocatalytic layer (120) contains a photocatalyst (121).

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