Photocatalytic multicolor paint and preparation method thereof

Abstract

The invention relates to a photocatalytic multicolor paint, which comprises a granulation glue solution, a base paint, a continuous phase and sintered color sand, the basic paint is prepared from the following components in parts by weight: 50 to 55 parts of water, 0.5 to 0.8 part of dispersing agent, 0.3 to 0.6 part of defoaming agent, 3 to 5 parts of powder, 1.3 to 1.8 parts of cellulose, 0.1 to 0.5 part of pH regulator, 25 to 30 parts of emulsion, 1 to 1.5 parts of anti-freezing agent, 1 to 1.5 parts of coalescing agent, 0.1 to 0.5 part of sterilizing agent, 1 to 5 parts of photocatalytic material and 5 to 10 parts of protective glue solution; the photocatalytic material is an N-TiO2 / SiO2 photocatalytic material prepared from acidified nano silicon dioxide, dilute nitric acid and tetrabutyl titanate through a hydrothermal reaction. According to the invention, the N-TiO2 / SiO2 photocatalytic material is introduced into the base paint, and the N-TiO2 / SiO2 photocatalytic material has a synergistic effect with the components such as the protective glue solution, the emulsion and the sintered color sand, so that a coating has the characteristics of excellent photocatalytic property, self-cleaning property, weather resistance and the like without finishing varnish, and the consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to a photocatalytic multi-colored coating and a preparation method thereof. Background Art

[0002] With the vigorous development of civil high-rise buildings and industrial steel structure buildings, the application of colorful imitation stone coatings in the construction field has become more and more extensive. However, traditional colorful imitation stone coatings face severe challenges in terms of functionality (such as stain resistance, water resistance, weather resistance, etc.) and consumption. Due to the acceleration of the industrialization process, the atmospheric turbidity has increased, and the outdoor walls have been exposed to wind and rain for a long time. Atmospheric pollutants are very easy to adhere and deposit, affecting the overall appearance of the building; at the same time, since most imitation stone coatings use color paste to adjust the color, the coating color is prone to aging over time. At present, the method of applying high-performance topcoat varnish on the coating surface is usually adopted to improve the above problems. Although it can achieve functions such as hydrophobicity and anti-fouling, this process undoubtedly increases the construction process, further leading to increased consumption and cost.

[0003] In view of this, the present invention is proposed. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a photocatalytic colorful coating and a preparation method thereof.

[0005] The technical solution adopted in the present invention is:

[0006] In one aspect, the present invention provides a photocatalytic colorful coating, comprising a granulated rubber solution, a base paint, a continuous phase, and sintered colored sand, wherein the base paint comprises, in parts by weight:

[0007] 50-55 parts of water, 0.5-0.8 parts of dispersant, 0.3-0.6 parts of defoaming agent, 3-5 parts of powder, 1.3-1.8 parts of cellulose, 0.1-0.5 parts of pH regulator, 25-30 parts of emulsion, 1-1.5 parts of antifreeze agent, 1-1.5 parts of film-forming aid, 0.1-0.5 parts of fungicide, 1-5 parts of photocatalytic material, 5-10 parts of protective glue solution;

[0008] The photocatalytic material is an N-TiO2 / SiO2 photocatalytic material prepared by hydrothermal reaction of acidified nano-silicon dioxide, dilute nitric acid and tetrabutyl titanate.

[0009] The present invention proposes a photocatalytic colorful coating, which introduces N-TiO2 / SiO2 photocatalytic material into the base paint. The N-TiO2 / SiO2 photocatalytic material works synergistically with components such as protective glue solution, emulsion, and sintered colored sand. Without the need for a topcoat varnish, the coating can have excellent photocatalytic, self-cleaning, and weather resistance properties, while reducing consumption. Specifically, the thickening and suspension effects of the protective glue can ensure that the N-TiO2 / SiO2 particles are evenly dispersed. On the one hand, it can avoid the agglomeration of N-TiO2 / SiO2 and maintain the stability of the coating's photocatalytic and superhydrophobic properties. On the other hand, it is beneficial for the porous structure of N-TiO2 / SiO2 to better play a lightweight filling role, reducing the coating density while enhancing the coating's coverage, reducing repeated spraying, and reducing consumption. The active groups in the emulsion can chemically bond with N-TiO2 / SiO2 to form a more stable structure, improving the durability and mechanical properties of the coating. The compounding of sintered colored sand and N-TiO2 / SiO2 can improve the weather resistance of the coating, and will not cause the problem of fading of the coating or blurred imitation stone effect due to the decomposition of conventional organic color pastes due to the introduction of photocatalytic materials. The multi-colored coating of the present invention innovatively integrates photocatalytic materials into the imitation stone coating system, realizing the functional integration of "photocatalysis-self-cleaning-weathering resistance" in a single coating, reducing the dependence on the topcoat, and optimizing consumption.

[0010] Preferably, the protective colloid solution comprises, by weight:

[0011] 89.8-90.9 parts of water, 9-10 parts of protective rubber powder, and 0.1-0.2 parts of fungicide.

[0012] Preferably, the preparation of the photocatalytic material specifically includes the following steps:

[0013] S1. Disperse 5-10 g of nano-silica in 10-20 mL of deionized water, add dilute nitric acid to adjust the pH to 1-1.5, stir for 30-45 minutes, and wash with anhydrous ethanol several times to obtain acidified nano-silica;

[0014] S2. Disperse the acidified nano-silica in 50-60 mL of anhydrous ethanol, add 1.5-2 mL of dilute nitric acid, stir for 30-45 min, then dropwise add 25-30 mL of 20% volume fraction tetrabutyl titanate ethanol solution, stir for 30-45 min, place the obtained mixed solution at 150° C. for hydrothermal reaction for 15 h, filter after cooling, wash several times with anhydrous ethanol, and dry to obtain N-TiO2 / SiO2 photocatalytic material.

[0015] Preferably, the granulation rubber solution comprises, by weight:

[0016] 90-95 parts of water, 0.1-0.2 parts of fungicide, 0.05-0.1 parts of defoaming agent, 0.2-0.5 parts of dustproof agent, 4-6 parts of protective rubber powder.

[0017] Preferably, the continuous phase comprises, by weight:

[0018] 5-15 parts of water, 0.5-0.8 parts of thickener, 0.1-0.5 parts of pH regulator, 0.1-0.5 parts of defoaming agent, 0.5-1 parts of bactericide, 0.1-0.5 parts of preservative, 75-80 parts of emulsion, 4-6 parts of antifreeze agent, 3-5 parts of film-forming aid.

[0019] Preferably, the sintered colored sand is pottery colored sand calcined at 900-1400°C.

[0020] More preferably, in the base paint and / or the granulating rubber solution, the protective rubber powder is nano-silicate protective rubber.

[0021] More preferably, in the base paint and / or the continuous phase, the emulsion is at least one of a silicone acrylic emulsion, a pure acrylic emulsion and a styrene acrylic emulsion.

[0022] Preferably, the weight ratio of the granulating rubber solution, the base paint, the continuous phase and the sintered colored sand is 20-25:30-35:10-15:30-35.

[0023] Another aspect of the present invention provides a method for preparing the above-mentioned photocatalytic multi-color coating, comprising the following steps:

[0024] A1. Prepare granulation rubber solution, base paint and continuous phase respectively and set aside;

[0025] A2, adding sintered colored sand to the base paint for coloring, then adding the toned base paint to the granulation rubber solution for granulation, and then adding the continuous phase and mixing until uniform, to obtain;

[0026] The preparation method of the base paint comprises the following steps:

[0027] Add water, dispersant and part of defoamer into a suitable container, stir at 300-600rpm for 2-5min, then add powder, cellulose and pH regulator, stir at 1000-1200rpm for 30-45min until the mixture fineness is ≤60μm, adjust the speed to 600-800rpm, then add emulsion, antifreeze agent, film-forming aid and remaining defoamer, stir for 5-10min, then add photocatalytic material, continue stirring for 5-10min, finally add protective glue solution, continue stirring for 5-10min, until uniform dispersion is obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 2 is a comparison chart of the hydrophobicity of the coatings of Comparative Example 2 (left) and Example 1 (right);

[0029] Figure 2 This is a comparison chart of the photocatalytic activities of Comparative Example 2 and Examples 1-3. DETAILED DESCRIPTION

[0030] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Instead, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0031] In one aspect, the present invention provides a photocatalytic colorful coating, comprising a granulated rubber solution, a base paint, a continuous phase, and sintered colored sand, wherein the base paint comprises, in parts by weight:

[0032] 50-55 parts of water, 0.5-0.8 parts of dispersant, 0.3-0.6 parts of defoaming agent, 3-5 parts of powder, 1.3-1.8 parts of cellulose, 0.1-0.5 parts of pH regulator, 25-30 parts of emulsion, 1-1.5 parts of antifreeze agent, 1-1.5 parts of film-forming aid, 0.1-0.5 parts of fungicide, 1-5 parts of photocatalytic material, 5-10 parts of protective glue solution;

[0033] The photocatalytic material is N-TiO2 / SiO2 photocatalytic material prepared by hydrothermal reaction of acidified nano-silicon dioxide, dilute nitric acid and tetrabutyl titanate.

[0034] In a preferred embodiment of the present invention, the protective colloid solution comprises, by weight:

[0035] 89.8-90.9 parts of water, 9-10 parts of protective rubber powder, and 0.1-0.2 parts of fungicide.

[0036] In a preferred embodiment of the present invention, the preparation of the photocatalytic material specifically comprises the following steps:

[0037] S1. Disperse 5-10 g of nano-silica in 10-20 mL of deionized water, add dilute nitric acid to adjust the pH to 1-1.5, stir for 30-45 minutes, and wash with anhydrous ethanol several times to obtain acidified nano-silica;

[0038] S2. Disperse the acidified nano-silica in 50-60 mL of anhydrous ethanol, add 1.5-2 mL of dilute nitric acid, stir for 30-45 min, then dropwise add 25-30 mL of 20% volume fraction tetrabutyl titanate ethanol solution, stir for 30-45 min, place the obtained mixture at 150°C for hydrothermal reaction for 15 hours, filter after cooling, wash several times with anhydrous ethanol, and dry to obtain N-TiO2 / SiO2 photocatalytic material.

[0039] In the present invention, by doping N element into TiO2, the light absorption range of TiO2 is broadened to the visible light region, the separation efficiency of photogenerated electron-hole pairs is improved, and the photocatalytic activity is enhanced, so that the coating can degrade organic pollutants under light; at the same time, the high dispersion effect and porous structure of acidified nano-silica (acidification treatment can increase the surface active sites and roughness of nano-silica) synergistically optimize the surface microstructure of the coating with N-TiO2, forming a super-hydrophobic surface (contact angle of more than 140°), which can achieve better anti-fouling and water whitening resistance without introducing other hydrophobic additives; and due to the porous characteristics of N-TiO2 / SiO2, the consumption of coating can also be reduced.

[0040] In a preferred embodiment of the present invention, the granulation rubber solution comprises, by weight:

[0041] 90-95 parts of water, 0.1-0.2 parts of fungicide, 0.05-0.1 parts of defoaming agent, 0.2-0.5 parts of dustproof agent, 4-6 parts of protective rubber powder.

[0042] In a preferred embodiment of the present invention, the continuous phase comprises, in parts by weight:

[0043] 5-15 parts of water, 0.5-0.8 parts of thickener, 0.1-0.5 parts of pH regulator, 0.1-0.5 parts of defoaming agent, 0.5-1 parts of bactericide, 0.1-0.5 parts of preservative, 75-80 parts of emulsion, 4-6 parts of antifreeze agent, 3-5 parts of film-forming aid.

[0044] In a preferred embodiment of the present invention, the sintered colored sand is pottery colored sand calcined at 900-1400°C.

[0045] In the present invention, high-temperature calcined ceramic colored sand is used for color adjustment. Due to the high-temperature treatment, it has high weather resistance, color stability and bonding strength, so that the coating not only has a luxurious, beautiful and elegant high-end effect like granite stone, but also has a transparent paint film color. After compounding with N-TiO2 / SiO2 photocatalytic material, it can further improve the weather resistance of the coating and avoid the problem of coating fading.

[0046] In a more preferred embodiment of the present invention, in the base paint and / or the granulating rubber solution, the protective rubber powder is nano-silicate protective rubber.

[0047] In a more preferred embodiment of the present invention, in the base paint and / or the continuous phase, the emulsion is at least one of a silicone acrylic emulsion, a pure acrylic emulsion and a styrene acrylic emulsion.

[0048] In a preferred embodiment of the present invention, the weight ratio of the granulating rubber solution, the base paint, the continuous phase and the sintered colored sand is 20-25:30-35:10-15:30-35.

[0049] Another aspect of the present invention provides a method for preparing the above-mentioned photocatalytic multi-color coating, comprising the following steps:

[0050] A1. Prepare granulation rubber solution, base paint and continuous phase respectively and set aside;

[0051] A2, adding sintered colored sand to the base paint for coloring, then adding the toned base paint to the granulation rubber solution for granulation, and then adding the continuous phase and mixing until uniform, to obtain;

[0052] The preparation method of the base paint comprises the following steps:

[0053] Add water, dispersant and part of defoamer into a suitable container, stir at 300-600rpm for 2-5min, then add powder, cellulose and pH regulator, stir at 1000-1200rpm for 30-45min until the mixture fineness is ≤60μm, adjust the speed to 600-800rpm, then add emulsion, antifreeze agent, film-forming aid and remaining defoamer, stir for 5-10min, then add photocatalytic material, continue stirring for 5-10min, finally add protective glue solution, continue stirring for 5-10min, until uniform dispersion is obtained.

[0054] In the following examples, the powder is titanium dioxide; the cellulose is hydroxyethyl cellulose; the antifreeze agent is ethylene glycol; the film-forming aid is dodecyl alcohol ester; and the dust suppressant is xanthan gum powder.

[0055] Example 1

[0056] A photocatalytic multi-color coating comprises a granulated rubber solution, a base paint, a continuous phase, and sintered colored sand (ceramic colored sand calcined at 1200° C.) in a weight ratio of 25:30:15:30, wherein the base paint comprises, in parts by weight:

[0057] 54 parts of water, 0.6 parts of dispersant, 0.5 parts of defoaming agent, 3 parts of powder, 1.5 parts of cellulose, 0.2 parts of pH regulator, 28 parts of emulsion (silicone acrylic emulsion), 1.4 parts of antifreeze, 1.5 parts of film-forming aid, 0.3 parts of fungicide, 1 part of photocatalytic material, 8 parts of protective glue solution;

[0058] The photocatalytic material is N-TiO2 / SiO2 photocatalytic material prepared by hydrothermal reaction of acidified nano-silicon dioxide, dilute nitric acid and tetrabutyl titanate.

[0059] The preparation of the photocatalytic material specifically includes the following steps:

[0060] S1. Disperse 8 g of nano-silica in 15 mL of deionized water, add dilute nitric acid to adjust the pH to 1, stir for 30 min, and wash with anhydrous ethanol three times to obtain acidified nano-silica;

[0061] S2. Disperse the acidified nano-silica in 50 mL of anhydrous ethanol, add 1.5 mL of dilute nitric acid, stir for 30 minutes, then dropwise add 25 mL of 20% volume fraction tetrabutyl titanate ethanol solution, stir for 30 minutes, place the obtained mixture at 150°C for hydrothermal reaction for 15 hours, filter after cooling, wash with anhydrous ethanol three times, and dry at 80°C for 10 hours to obtain N-TiO2 / SiO2 photocatalytic material.

[0062] The protective gel solution includes, by weight:

[0063] 89.8 parts of water, 10 parts of protective rubber powder (nano silicate protective rubber), and 0.2 parts of fungicide.

[0064] The granulation rubber solution comprises, by weight:

[0065] 94.4 parts of water, 0.2 parts of fungicide, 0.1 parts of defoamer, 0.3 parts of dustproof agent, 5 parts of protective rubber powder (nano silicate protective rubber).

[0066] The continuous phase includes, by weight:

[0067] 9 parts of water, 0.7 parts of thickener, 0.2 parts of pH regulator, 0.2 parts of defoaming agent, 0.6 parts of bactericide, 0.3 parts of preservative, 80 parts of emulsion (silicone acrylic emulsion), 4 parts of antifreeze agent, and 5 parts of film-forming aid.

[0068] It is prepared by the following method, comprising the following steps:

[0069] A1. Prepare granulation rubber solution, base paint and continuous phase respectively, and set aside. Specifically, the steps include:

[0070] Prepare granulated rubber solution: add protective rubber powder to water, stir at 1200 rpm for 1 hour, then add fungicide, defoamer and dust suppressant, mix well, and obtain the solution.

[0071] Preparation of base paint: Add water, dispersant and part of defoamer to a suitable container, stir at 400 rpm for 3 minutes, then add powder, cellulose and pH adjuster, stir at 1000 rpm for 35 minutes until the mixture fineness is ≤60 μm, adjust the speed to 700 rpm, then add emulsion, antifreeze agent, film-forming agent and remaining defoamer, stir for 8 minutes, then add photocatalytic material, continue stirring for 8 minutes, and finally add protective glue solution, continue stirring for 8 minutes until uniform dispersion, thereby obtaining the base paint; wherein, the preparation of protective glue solution is as follows: add protective glue powder to water, stir at 1200 rpm for 1 hour, then add fungicide, mix evenly, thereby obtaining the base paint;

[0072] Prepare the continuous phase: add water, thickener, defoamer, bactericide and preservative into a suitable container, stir at 400 rpm for 3 minutes, continue to add pH regulator, adjust the speed to 700 rpm, then add emulsion, antifreeze agent and film-forming aid, continue stirring for 8 minutes.

[0073] A2. Add sintered colored sand to the base paint for color adjustment. Let the toned base paint stand for 2 hours, add it to the granulating rubber solution for granulation, and then add the continuous phase and mix until uniform.

[0074] Example 2

[0075] The main difference between this embodiment and embodiment 1 is that the amounts of the components are different. The other steps remain unchanged.

[0076] A photocatalytic multi-color coating comprises a granulated rubber solution, a base paint, a continuous phase, and sintered colored sand (ceramic colored sand calcined at 1200° C.) in a weight ratio of 20:30:15:35, wherein the base paint comprises, in parts by weight:

[0077] 53 parts of water, 0.6 parts of dispersant, 0.5 parts of defoaming agent, 3 parts of powder, 1.5 parts of cellulose, 0.2 parts of pH regulator, 28 parts of emulsion (silicone acrylic emulsion), 1.4 parts of antifreeze, 1.5 parts of film-forming aid, 0.3 parts of fungicide, 2 parts of photocatalytic material, 8 parts of protective glue solution;

[0078] The photocatalytic material is an N-TiO2 / SiO2 photocatalytic material prepared by hydrothermal reaction of acidified nano-silicon dioxide, dilute nitric acid and tetrabutyl titanate. The preparation method of the photocatalytic material is the same as that of Example 1.

[0079] The protective gel solution includes, by weight:

[0080] 89.8 parts of water, 10 parts of protective rubber powder (nano silicate protective rubber), and 0.2 parts of fungicide.

[0081] The granulation rubber solution comprises, by weight:

[0082] 94.4 parts of water, 0.2 parts of fungicide, 0.1 parts of defoamer, 0.3 parts of dustproof agent, 5 parts of protective rubber powder (nano silicate protective rubber).

[0083] The continuous phase includes, by weight:

[0084] 9 parts of water, 0.7 parts of thickener, 0.2 parts of pH regulator, 0.2 parts of defoaming agent, 0.6 parts of bactericide, 0.3 parts of preservative, 80 parts of emulsion (silicone acrylic emulsion), 4 parts of antifreeze agent, and 5 parts of film-forming aid.

[0085] Example 3

[0086] The main difference between this embodiment and embodiment 1 is that the amounts of the components are different. The other steps remain unchanged.

[0087] A photocatalytic multi-color coating comprises a granulated rubber solution, a base paint, a continuous phase, and sintered colored sand (ceramic colored sand calcined at 1200° C.) in a weight ratio of 20:30:15:35, wherein the base paint comprises, in parts by weight:

[0088] 50 parts of water, 0.6 parts of dispersant, 0.5 parts of defoaming agent, 3 parts of powder, 1.5 parts of cellulose, 0.2 parts of pH regulator, 28 parts of emulsion (silicone acrylic emulsion), 1.4 parts of antifreeze, 1.5 parts of film-forming aid, 0.3 parts of fungicide, 5 parts of photocatalytic material, 8 parts of protective glue solution;

[0089] The photocatalytic material is an N-TiO2 / SiO2 photocatalytic material prepared by hydrothermal reaction of acidified nano-silicon dioxide, dilute nitric acid and tetrabutyl titanate. The preparation method of the photocatalytic material is the same as that of Example 1.

[0090] The protective gel solution includes, by weight:

[0091] 89.8 parts of water, 10 parts of protective rubber powder (nano silicate protective rubber), and 0.2 parts of fungicide.

[0092] The granulation rubber solution comprises, by weight:

[0093] 94.4 parts of water, 0.2 parts of fungicide, 0.1 parts of defoamer, 0.3 parts of dustproof agent, 5 parts of protective rubber powder (nano silicate protective rubber).

[0094] The continuous phase includes, by weight:

[0095] 13 parts of water, 0.7 parts of thickener, 0.2 parts of pH regulator, 0.2 parts of defoaming agent, 0.6 parts of bactericide, 0.3 parts of preservative, 76 parts of emulsion (silicone acrylic emulsion), 4 parts of antifreeze, and 5 parts of film-forming aid.

[0096] Comparative Example 1

[0097] The difference between this comparative example and Example 1 is that (1) an equal amount of white sand is used to replace the sintered colored sand, and color paste is used for color adjustment. The weight ratio of granulation rubber solution, base paint, continuous phase, white sand and color paste is 25:30:15:30:0.01; (2) no photocatalytic material is added to the base paint, and water is used to make up the difference.

[0098] Comparative Example 2

[0099] The difference between this comparative example and Example 1 is that no photocatalytic material is added to the base paint, and water is used to make up the base paint.

[0100] The multi-colored coatings prepared in Examples 1-3 and Comparative Examples 1-2 were tested, and the results are recorded in Tables 1 and Figure 1-2 .

[0101] Detection method:

[0102] (1) Test in accordance with the test methods and test items in HG / T 4343-2024 "Water-based Multi-color Architectural Coatings";

[0103] (2) Surface wettability was measured and analyzed using an optical contact angle meter (DSA100, Kruss, Germany). At room temperature, the coating was placed on a test bench to ensure the upper surface was level. A 5 μL drop of water was dropped onto the surface using a microinjector. After 15 s, the contact angle of the drop on the sponge surface was measured.

[0104] (3) Photocatalytic activity was evaluated using a photocatalytic reaction system. Light source conditions: 500W xenon lamp, light intensity 110mW / cm 2 , full-spectrum irradiation. Degradation substrate: methyl orange dye solution (MO). The coating was immersed in a reactor containing 100 mL of 10 mg / L MO dye solution and reacted in the dark for 30 hours. Full-spectrum irradiation and light reaction were performed for 10 hours. Samples were taken every hour and centrifuged to obtain the supernatant for analysis. Samples were taken at fixed intervals and the absorbance at the maximum absorption wavelength (485 nm) was measured using a UV-visible spectrophotometer. The degradation rate was calculated according to the following formula.

[0105] Degradation rate = [1-(A t / A0)]×100%, where: A t and A0 are the absorbance of MO dye solution at time t and the initial time, respectively;

[0106] (4) Use an artificial light aging machine and a QUV / SPRAY tester to test the light aging resistance of the coating, and test the light exposure time when the yellowing is 1;

[0107] (5) Wall construction test, 1m 2 As the standard, calculate the consumption required to fully cover each square meter of wall.

[0108] Table 1

[0109]

[0110] As can be seen from Table 1, the photocatalytic colorful coatings prepared in Examples 1-3 of the present invention meet the various standard requirements of HG / T4343-2024 "Water-based Colorful Architectural Coatings", and the bonding strength, stain resistance, weather resistance, and consumption are all better than those of Comparative Examples 1-2. At the same time, by comparing Example 1 with Comparative Examples 1-2, it can be seen that the photocatalytic and super-hydrophobic properties of N-TiO2 / SiO2 of the present invention can improve the stain resistance of the coating, and the loose and porous properties of N-TiO2 / SiO2 can reduce the specific gravity of the finished product and reduce the consumption of the coating; in addition, sintered colored sand and N-TiO2 / SiO2 have a significant synergistic effect in terms of weather resistance. Combined Figure 1 It can be seen that the coating of Comparative Example 2, in which N-TiO2 / SiO2 is not added, exhibits hydrophilicity, while Example 1 exhibits high hydrophobicity, and water droplets can maintain a round shape on the coating surface; Figure 2 The results show that in Comparative Example 2, in which N-TiO2 / SiO2 is not added, the coating has almost no photocatalytic activity, while Examples 1-3 all exhibit good photocatalytic activity, and the photocatalytic degradation rate of the coating for MO dye solution increases with the increase in the amount of photocatalytic material used, indicating that the introduction of photocatalytic materials into the colorful coating of the present invention can give the coating an environmental purification function.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A photocatalytic colorful paint, characterized in that: The invention comprises a granulating rubber solution, a base paint, a continuous phase and sintered colored sand, wherein the base paint comprises, by weight: 50-55 parts of water, 0.5-0.8 parts of dispersant, 0.3-0.6 parts of defoaming agent, 3-5 parts of powder, 1.3-1.8 parts of cellulose, 0.1-0.5 parts of pH regulator, 25-30 parts of emulsion, 1-1.5 parts of antifreeze agent, 1-1.5 parts of film-forming aid, 0.1-0.5 parts of fungicide, 1-5 parts of photocatalytic material, 5-10 parts of protective glue solution; The photocatalytic material is an N-TiO2 / SiO2 photocatalytic material prepared by hydrothermal reaction of acidified nano-silicon dioxide, dilute nitric acid and tetrabutyl titanate.

2. The photocatalytic multi-color coating according to claim 1, characterized in that: The protective colloid solution includes, by weight: 89.8-90.9 parts of water, 9-10 parts of protective rubber powder, and 0.1-0.2 parts of fungicide.

3. The photocatalytic multi-color coating according to claim 1, characterized in that: The preparation of the photocatalytic material specifically comprises the following steps: S1. Disperse 5-10 g of nano-silica in 10-20 mL of deionized water, add dilute nitric acid to adjust the pH to 1-1.5, stir for 30-45 minutes, and wash with anhydrous ethanol several times to obtain acidified nano-silica; S2. Disperse the acidified nano-silica in 50-60 mL of anhydrous ethanol, add 1.5-2 mL of dilute nitric acid, stir for 30-45 min, then dropwise add 25-30 mL of 20% volume fraction tetrabutyl titanate ethanol solution, stir for 30-45 min, place the obtained mixed solution at 150° C. for hydrothermal reaction for 15 h, filter after cooling, wash several times with anhydrous ethanol, and dry to obtain N-TiO2 / SiO2 photocatalytic material.

4. The photocatalytic multi-color coating according to claim 1, characterized in that: The granulation rubber solution comprises, by weight: 90-95 parts of water, 0.1-0.2 parts of fungicide, 0.05-0.1 parts of defoaming agent, 0.2-0.5 parts of dustproof agent, 4-6 parts of protective rubber powder.

5. The photocatalytic multi-color coating according to claim 1, characterized in that: The continuous phase includes, by weight: 5-15 parts of water, 0.5-0.8 parts of thickener, 0.1-0.5 parts of pH regulator, 0.1-0.5 parts of defoaming agent, 0.5-1 parts of bactericide, 0.1-0.5 parts of preservative, 75-80 parts of emulsion, 4-6 parts of antifreeze agent, 3-5 parts of film-forming aid.

6. The photocatalytic multi-color coating according to claim 1, characterized in that: The sintered colored sand is pottery colored sand calcined at 900-1400°C.

7. The photocatalytic multi-color coating according to claim 2 or 4, characterized in that: In the base paint and / or the granulation rubber solution, the protective rubber powder is nano-silicate protective rubber.

8. The photocatalytic multi-color coating according to claim 1 or 5, characterized in that: In the base paint and / or the continuous phase, the emulsion is at least one of a silicone acrylic emulsion, a pure acrylic emulsion and a styrene acrylic emulsion.

9. The photocatalytic multi-color coating according to claim 1, characterized in that: The weight ratio of the granulating rubber solution, the basic paint, the continuous phase and the sintered colored sand is 20-25:30-35:10-15:30-35.

10. A method for preparing the photocatalytic multi-color coating according to claim 1, characterized in that: The following steps are involved: A1. Prepare granulation rubber solution, base paint and continuous phase respectively and set aside; A2, adding sintered colored sand to the base paint for coloring, then adding the toned base paint to the granulation rubber solution for granulation, and then adding the continuous phase and mixing until uniform, to obtain; The preparation method of the base paint comprises the following steps: Add water, dispersant and part of defoamer into a suitable container, stir at 300-600rpm for 2-5min, then add powder, cellulose and pH regulator, stir at 1000-1200rpm for 30-45min until the mixture fineness is ≤60μm, adjust the speed to 600-800rpm, then add emulsion, antifreeze agent, film-forming aid and remaining defoamer, stir for 5-10min, then add photocatalytic material, continue stirring for 5-10min, finally add protective glue solution, continue stirring for 5-10min, until uniform dispersion is obtained.

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