Environment-friendly anti-fouling self-cleaning sand-containing multicolor coating and preparation method thereof

Abstract

The invention relates to an environment-friendly anti-fouling self-cleaning sand-containing multicolor paint, which is composed of the following components: a color point base paint, a continuous phase and a granulation liquid in a mass ratio of (6-6.5): (2-3): (2-3), wherein the color point base paint comprises deionized water, a bactericide, a dispersing agent, nano silicon dioxide, a defoaming agent, cellulose A, cellulose B, a coalescing agent, an anti-freezing agent, a pH value regulator, a photocatalytic material, a water-based resin base material, a cross-linking agent, modified protective glue and color sand; the continuous phase comprises deionized water, a preservative, an antifreeze agent, bentonite, a hydrophobic modifier, a cross-linking agent, a defoaming agent, a thickening agent and a coalescing agent; the environment-friendly anti-pollution self-cleaning sand-containing multicolor paint has excellent hydrophobic performance, can effectively prevent pollutant adhesion and reduce the cleaning and maintenance cost, and by adding a doped titanium dioxide photocatalytic material, the environment-friendly anti-pollution self-cleaning sand-containing multicolor paint has the advantages that the environment-friendly anti-pollution self-cleaning sand-containing multicolor paint has excellent anti-pollution performance, and the environment-friendly anti-pollution self-cleaning sand-containing multicolor paint has excellent anti-pollution performance. The coating still has a good self-cleaning function under a weak light condition.

Description

Technical Field

[0001] The present invention relates to the field of environmentally friendly coatings, in particular to an environmentally friendly anti-fouling self-cleaning sand-containing multi-colored coating and a preparation method thereof. Background Art

[0002] Sand-containing multi-color paints, with their diverse colors and rich textures, have been widely used in building exterior wall decoration. However, traditional architectural paints are highly susceptible to contamination during use, especially in outdoor environments. Dust, oil, and other pollutants can adhere to the coating surface, damaging the building's aesthetics and significantly increasing cleaning and maintenance costs.

[0003] Most of the self-cleaning coatings currently on the market rely on photocatalytic materials (such as titanium dioxide) to achieve their self-cleaning function. However, the self-cleaning effect of such coatings is greatly reduced under weak light or even no light conditions, and they may also release harmful substances during use, which does not meet environmental protection requirements.

[0004] Therefore, we propose an environmentally friendly anti-fouling self-cleaning sand-containing colorful coating and its preparation method, which has both anti-fouling and self-cleaning functions and meets environmental protection standards. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and meet practical needs by providing an environmentally friendly, anti-fouling, self-cleaning, sand-containing, multi-colored coating and a preparation method thereof, so as to solve the problem that current traditional architectural coatings are extremely susceptible to pollution during actual use, especially in outdoor environments, where pollutants such as dust and oil will adhere to the coating surface, not only destroying the aesthetic appearance of the building, but also significantly increasing the cleaning and maintenance costs. Currently available self-cleaning coatings on the market mostly rely on photocatalytic materials (such as titanium dioxide) to achieve self-cleaning functions, but such coatings have a greatly reduced self-cleaning effect under low light or even no light conditions, and may also release harmful substances during use, thus failing to meet environmental protection requirements.

[0006] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is: designing an environmentally friendly anti-fouling self-cleaning sand-containing colorful coating, which is composed of the following components in the following mass ratios:

[0007] Color dot base paint: continuous phase: granulation liquid = 6-6.5:2-3:2-3;

[0008] in:

[0009] The color dot base paint comprises deionized water, fungicide, dispersant, nano silicon dioxide, defoamer, cellulose A, cellulose B, film-forming aid, antifreeze agent, pH regulator, photocatalytic material, water-based resin base material, cross-linking agent, modified protective glue and colored sand;

[0010] The continuous phase includes deionized water, preservatives, antifreeze agents, bentonite, hydrophobic modifiers, cross-linking agents, defoaming agents, thickeners and film-forming aids;

[0011] The granulation liquid comprises deionized water, modified protective glue, preservative and anti-settling agent.

[0012] Preferably, the color dot base paint comprises, by weight:

[0013] 140-200 parts of deionized water, 1-2 parts of fungicide, 1-2 parts of dispersant, 10-15 parts of nano-silicon dioxide, 1-1.5 parts of defoaming agent, 2-4 parts of cellulose A, 7-10 parts of cellulose B, 3-5 parts of film-forming aid, 3-5 parts of antifreeze agent, 1-2 parts of pH regulator, 10-20 parts of photocatalytic material, 20-40 parts of water-based resin base material, 60-90 parts of cross-linking agent, 3-5 parts of modified protective glue, and 200-300 parts of colored sand.

[0014] Preferably, the continuous phase comprises, by weight:

[0015] 40-60 parts of deionized water, 2-3 parts of preservative, 10-15 parts of antifreeze agent, 2-4 parts of bentonite, 6-10 parts of hydrophobic modifier, 100-140 parts of cross-linking agent, 2-3 parts of defoaming agent, 2-4 parts of thickener, and 4-6 parts of film-forming aid.

[0016] Preferably, the granulation liquid comprises, by weight:

[0017] 150-200 parts of deionized water, 7-12 parts of modified protective glue, 0.3-0.6 parts of preservatives, and 0.5-1 parts of anti-settling agents.

[0018] Preferably,

[0019] The photocatalytic material is doped titanium dioxide, which is used to decompose pollutants through photocatalysis under weak light conditions;

[0020] The hydrophobic modifier is a fluorocarbon modifier or a silane coupling agent, which is used to construct a super-hydrophobic surface;

[0021] The water-based resin base material is a self-crosslinking water-based acrylic resin.

[0022] Preferably, the particle size of the nano-silicon dioxide is 1-100 nanometers and the Mohs hardness is 7; the colored sand is natural colored sand or artificially dyed sand; the anti-settling agent is fumed silica, the pH regulator is AMP-95, a mixture of 2-amino-2-methyl-1-propanol and water, and the bentonite is synthetic bentonite.

[0023] Preferably, the cellulose A is ethyl hydroxyethyl cellulose, and the cellulose B is hydroxyethyl cellulose.

[0024] Preferably, the fungicide is 2-methyl-4-isothiazoline-3-one, the dispersant is a polyacrylate ammonium salt dispersant, the film-forming aid is dipropylene glycol methyl ether, the thickener is an alkali swelling thickener, the cross-linking agent is an aqueous acrylic emulsion, the defoamer is a mineral oil defoamer, the modified protective glue is a synthetic silicate-magnesium aluminum silicate, and the antifreeze agent is monoethylene glycol.

[0025] The method for preparing the above-mentioned environmentally friendly anti-fouling self-cleaning sand-containing multi-colored coating comprises the following steps:

[0026] S1. Preparation of color dot base paint: bactericide, cellulose, dispersant, defoamer, pH regulator, film-forming aid, and antifreeze agent are sequentially added to deionized water and mixed, followed by addition of nano-silica and photocatalytic material, followed by addition of water-based resin base, cross-linking agent, and modified protective adhesive, and finally, addition of colored sand;

[0027] S2. Preparing a continuous phase: adding a preservative, an antifreeze agent, a hydrophobic modifier, and bentonite to deionized water and mixing, followed by adding a crosslinking agent, a defoaming agent, and a thickener;

[0028] S3. Preparing a granulation solution: adding the modified protective colloid and the preservative to deionized water and mixing, and then adding an anti-settling agent;

[0029] S4. Mix the color dot base paint, the continuous phase and the granulation liquid in proportion and granulate them to obtain a finished paint.

[0030] Preferably, in the mixing step of the color dot base paint, the stirring speed is 450-1400 rpm, and the fineness of the liquid is ≤55 μm;

[0031] During the continuous phase mixing step, the stirring speed is 450-800 rpm;

[0032] In the step of mixing the granulation liquid, the stirring speed is 450-1200 rpm.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The environmentally friendly, anti-fouling, self-cleaning, sand-containing colorful coating provided by the present invention has excellent hydrophobic properties, can effectively prevent the adhesion of pollutants, and reduce cleaning and maintenance costs.

[0035] 2. By adding doped titanium dioxide photocatalytic material, the coating of the present invention still has good self-cleaning function under weak light conditions.

[0036] 3. The present invention adopts water-based acrylic emulsion and environmentally friendly additives, and the coating does not pollute the environment during production and use.

[0037] 4. The coating of the present invention contains colored sand particles, which provide rich colors and textures and meet the needs of building exterior wall decoration.

[0038] 5. The coating of the present invention has good adhesion, wear resistance and weather resistance, and is suitable for a variety of substrates. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the process of the present invention; DETAILED DESCRIPTION

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0041] An environmentally friendly anti-fouling self-cleaning sand-containing multi-color coating and its preparation method, see Figure 1 , composed of the following components in the following mass ratios:

[0042] Color dot base paint: continuous phase: granulation liquid = 6-6.5:2-3:2-3;

[0043] in:

[0044] The color dot base paint includes deionized water, fungicide, dispersant, nano-silica, defoamer, cellulose A, cellulose B, film-forming aid, antifreeze agent, pH regulator, photocatalytic material, water-based resin base, cross-linking agent, modified protective glue and colored sand;

[0045] The continuous phase includes deionized water, preservatives, antifreeze agents, bentonite, hydrophobic modifiers, cross-linking agents, defoaming agents, thickeners and film-forming aids;

[0046] The granulation liquid includes deionized water, modified protective glue, preservative and anti-settling agent.

[0047] For details, see Figure 1 The color dot base paint includes the following parts by weight:

[0048] 140-200 parts of deionized water, 1-2 parts of fungicide, 1-2 parts of dispersant, 10-15 parts of nano-silicon dioxide, 1-1.5 parts of defoaming agent, 2-4 parts of cellulose A, 7-10 parts of cellulose B, 3-5 parts of film-forming aid, 3-5 parts of antifreeze agent, 1-2 parts of pH regulator, 10-20 parts of photocatalytic material, 20-40 parts of water-based resin base material, 60-90 parts of cross-linking agent, 3-5 parts of modified protective glue, and 200-300 parts of colored sand.

[0049] For more details, see Figure 1 , the continuous phase comprises, by weight:

[0050] 40-60 parts of deionized water, 2-3 parts of preservative, 10-15 parts of antifreeze agent, 2-4 parts of bentonite, 6-10 parts of hydrophobic modifier, 100-140 parts of cross-linking agent, 2-3 parts of defoaming agent, 2-4 parts of thickener, and 4-6 parts of film-forming aid.

[0051] For further information, see Figure 1 The granulation liquid comprises, by weight:

[0052] 150-200 parts of deionized water, 7-12 parts of modified protective glue, 0.3-0.6 parts of preservatives, and 0.5-1 parts of anti-settling agents.

[0053] Further, see Figure 1 The photocatalytic material is doped titanium dioxide. Pure titanium dioxide has photocatalytic activity only under ultraviolet light (wavelength ≤ 387nm), while doped titanium dioxide can play a role in visible light and even weak light conditions by adjusting the energy band structure. Doped titanium dioxide can produce strong oxidizing hydroxyl radicals (·OH) and superoxide radicals (·O2 - ) is used for degrading organic pollutants, sterilizing, and air purification. It decomposes organic matter attached to the surface through photocatalysis, achieving a self-cleaning function. Doped titanium dioxide is non-toxic and pollution-free, meeting environmental protection requirements;

[0054] The hydrophobic modifier is a fluorocarbon modifier or a silane coupling agent, such as methyltrimethoxysilane, octyltriethoxysilane, perfluoroalkyl compounds, etc., which have extremely low surface energy and can provide excellent hydrophobicity and anti-fouling properties. A hydrophobic layer is formed on the surface of the material through a hydrolysis condensation reaction, and hydrophobic groups (such as alkyl groups, fluorocarbon chains, etc.) are introduced on the surface of the material to reduce the surface energy. Common hydrophobic groups include: -CH3 (methyl) and -CF3 (trifluoromethyl), which are used to improve the hydrophobic properties of the coating and construct a micro-nanoscale rough structure on the surface of the material to form a super-hydrophobic surface similar to the "lotus effect", which has hydrophobic, anti-fouling, wear-resistant and other properties, and improves the self-cleaning efficiency of the coating.

[0055] The water-based resin base is a self-crosslinking water-based acrylic resin, such as Dow RESIN HF-05A, which has excellent weather resistance and decorative properties.

[0056] It is worth noting that, see Figure 1Nano-silica is an ultrafine silicon dioxide (SiO2) particle with a particle size in the range of 1-100 nanometers. It has unique physical and chemical properties. Due to its high specific surface area, high surface activity, excellent dispersibility and stability, its Mohs hardness is 7, close to quartz, which can significantly improve its strength, hardness, wear resistance and aging resistance. It is non-toxic and pollution-free and meets environmental protection requirements; the colored sand is natural colored sand or artificially dyed sand; the anti-settling agent is fumed silica, such as KMT-4007 from Corning New Materials; the pH adjuster is AMP-95, a mixture of about 95% 2-amino-2-methyl-1-propanol and about 5% water developed and produced by Dow Chemical Company of the United States; the bentonite is synthetic bentonite, such as LB from Zhejiang Changan Renheng.

[0057] It is worth noting that see Figure 1 Cellulose A is EHM500 ethyl hydroxyethyl cellulose from Akzo Nobel, and cellulose B is from Aqualon Corporation of the United States. 250 hydroxyethyl cellulose.

[0058] It is worth mentioning that see Figure 1 The fungicide is 2-methyl-4-isothiazoline-3-one, the dispersant is a polyacrylate ammonium salt dispersant, such as SN-DISPERSANT 5027 produced by Nopco; the film-forming aid is dipropylene glycol methyl ether, the thickener is an alkali swelling thickener, such as HS1153 of BASF; the cross-linking agent is a water-based acrylic emulsion, such as RS-2866 and RS-3866 of Budford; the defoaming agent is a mineral oil defoaming agent, such as NXZ of Nopco of Japan; the modified protective glue is a synthetic silicate-magnesium aluminum silicate, such as 919 of Nian New Materials, and the antifreeze agent is monoethylene glycol of Dow Chemical of the United States.

[0059] The method for preparing the above-mentioned environmentally friendly anti-fouling self-cleaning sand-containing multi-colored coating comprises the following steps:

[0060] S1. Preparation of color dot base paint: bactericide, cellulose, dispersant, defoamer, pH regulator, film-forming aid, and antifreeze agent are sequentially added to deionized water and mixed, followed by addition of nano-silica and photocatalytic material, followed by addition of water-based resin base, cross-linking agent, and modified protective adhesive, and finally, addition of colored sand;

[0061] S2. Preparing a continuous phase: adding a preservative, an antifreeze agent, a hydrophobic modifier, and bentonite to deionized water and mixing, followed by adding a crosslinking agent, a defoaming agent, and a thickener;

[0062] S3. Preparing a granulation solution: adding the modified protective colloid and the preservative to deionized water and mixing, and then adding an anti-settling agent;

[0063] S4. Mix the color dot base paint, the continuous phase and the granulation liquid in proportion and granulate them to obtain a finished paint.

[0064] It is worth noting that, see Figure 1 In the mixing step of the color dot base paint, the stirring speed is 450-1400 rpm, and the fineness of the liquid is ≤55μm;

[0065] During the continuous phase mixing step, the stirring speed was 450-800 rpm;

[0066] During the mixing step of the granulation liquid, the stirring speed is 450-1200 rpm.

[0067] Example 1

[0068] Recipe composition:

[0069] Color point base paint components (parts by weight):

[0070] Deionized water 190, bactericide 2, dispersant 2, nano silicon dioxide 6, cellulose A10, cellulose B10, film-forming aid 4, antifreeze agent 5, pH regulator 1, photocatalytic material 9, water-based resin base 20, cross-linking agent (Badfu RS-2866) 85, defoaming agent 2, modified protective glue (Nian 919) 4, colored sand 260.

[0071] Continuous phase components (parts by weight):

[0072] Deionized water 44, preservative 3, bentonite (Zhejiang Changan Renheng LB) 2, antifreeze agent 12, hydrophobic modifier (methyltrimethoxysilane) 4, cross-linking agent (Badford RS-3866) 125, defoaming agent 3, thickener (BASF HS1153) 3, film-forming aid 4.

[0073] Granulation liquid components (parts by weight):

[0074] Deionized water 190, modified protective glue (Nian 919) 9, preservative 0.4, anti-settling agent (Corning KMT-4007) 0.6.

[0075] Preparation method:

[0076] S1. Preparation of color dot base paint:

[0077] (1) Add 190 parts of deionized water to a reaction tank, stir at 450 rpm, and add 2 parts of fungicide, 10 parts of cellulose A, 10 parts of cellulose B, 2 parts of dispersant, 2 parts of defoamer, 1 part of pH regulator, 4 parts of film-forming aid, and 5 parts of antifreeze in sequence, and stir for 5 minutes to mix evenly;

[0078] (2) Add 6 parts of nano-silicon dioxide and 9 parts of photocatalytic material, and disperse at a high speed of 1400 rpm for 15 minutes. The fineness of the liquid is ≤55 μm;

[0079] (3) Add 20 parts of water-based resin base, 85 parts of cross-linking agent (RS-2866), 2 parts of fungicide, and 2 parts of defoamer, and stir at 900 rpm for 5 minutes;

[0080] (4) Slowly add 4 parts of modified protective glue (pre-dissolved in water) and stir at 1200 rpm for 30 minutes. The medium shear viscosity is measured to be 130 KU (34°C);

[0081] (5) Add 260 parts of colored sand and stir at 800 rpm for 5 minutes to prepare a colored base paint.

[0082] S2. Preparation of continuous phase:

[0083] (1) Add 44 parts of deionized water to a reaction tank and stir at 450 rpm. Then add 3 parts of preservative, 12 parts of antifreeze, 4 parts of hydrophobic modifier, 4 parts of film-forming aid, and 2 parts of bentonite (LB) in sequence and stir at 800 rpm for 10 minutes.

[0084] (2) Add 125 parts of a crosslinking agent (RS-3866), 3 parts of a defoaming agent, and 3 parts of a thickener (HS1153) and stir at 600 rpm for 15 minutes to prepare a continuous phase.

[0085] S3. Preparation of granulation liquid:

[0086] (1) Add 190 parts of deionized water to a reaction tank, stir at 450 rpm, add 0.4 parts of preservative and 9 parts of modified protective glue (Nian 919), and stir at 1200 rpm for 20 minutes;

[0087] (2) Add 0.6 parts of anti-settling agent (KMT-4007) and stir at 900 rpm for 40 minutes to prepare a granulation liquid.

[0088] S4. Preparation of finished coating products:

[0089] The color dot base paint, the continuous phase and the granulation liquid were mixed in a mass ratio of 6:2:2, and granulated with a granulator at 1000 rpm to prepare an environmentally friendly anti-fouling self-cleaning sand-containing colorful paint.

[0090] Example 2

[0091] Recipe composition:

[0092] Color point base paint components (parts by weight):

[0093] Deionized water 173, bactericide 2, dispersant 2, nano-silicon dioxide 14, cellulose A10, cellulose B10, film-forming aid 4, antifreeze agent 5, pH regulator 1, photocatalytic material 18, water-based resin base material 30, cross-linking agent (Badfu RS-2866) 75, defoaming agent 2, modified protective glue (Nian 919) 4, colored sand 260.

[0094] Continuous phase components (parts by weight):

[0095] Deionized water 43, preservative 3, bentonite (Zhejiang Changan Renheng LB) 2, antifreeze agent 12, hydrophobic modifier (octyltriethoxysilane) 10, crosslinker (Badford RS-3866) 120, defoaming agent 3, thickener (BASF HS1153) 3, film-forming aid 4.

[0096] Granulation liquid components (parts by weight):

[0097] Deionized water 190, modified protective glue (Nian 919) 9, preservative 0.4, anti-settling agent (Corning KMT-4007) 0.6.

[0098] Preparation method:

[0099] S1. Preparation of color dot base paint:

[0100] (1) Add 173 parts of deionized water to a reaction tank, stir at 450 rpm, and add 2 parts of fungicide, 10 parts of cellulose A, 10 parts of cellulose B, 2 parts of dispersant, 2 parts of defoamer, 1 part of pH regulator, 4 parts of film-forming aid, and 5 parts of antifreeze in sequence, and stir for 5 minutes to mix evenly;

[0101] (2) Add 14 parts of nano-silicon dioxide and 18 parts of photocatalytic material, and disperse at a high speed of 1400 rpm for 15 minutes. The fineness of the liquid is ≤55 μm;

[0102] (3) Add 30 parts of water-based resin base, 75 parts of cross-linking agent (RS-2866), 2 parts of fungicide, and 2 parts of defoamer, and stir at 900 rpm for 5 minutes;

[0103] (4) Slowly add 4 parts of modified protective glue (pre-dissolved in water) and stir at 1200 rpm for 30 minutes. The medium shear viscosity is measured to be 128 kU (35 °C);

[0104] (5) Add 260 parts of colored sand and stir at 800 rpm for 5 minutes to prepare a colored base paint.

[0105] S2. Preparation of continuous phase:

[0106] (1) Add 43 parts of deionized water to a reaction tank and stir at 450 rpm. Then add 3 parts of preservative, 12 parts of antifreeze, 10 parts of hydrophobic modifier, 4 parts of film-forming aid, and 2 parts of bentonite (LB) in sequence and stir at 800 rpm for 10 minutes.

[0107] (2) Add 120 parts of a crosslinking agent (RS-3866), 3 parts of a defoaming agent, and 3 parts of a thickener (HS1153) and stir at 600 rpm for 15 minutes to prepare a continuous phase.

[0108] S3. Preparation of granulation liquid:

[0109] (1) Add 190 parts of deionized water to a reaction tank, stir at 450 rpm, add 0.4 parts of preservative and 9 parts of modified protective glue (Nian 919), and stir at 1200 rpm for 20 minutes;

[0110] (2) Add 0.6 parts of anti-settling agent (KMT-4007) and stir at 900 rpm for 40 minutes to prepare a granulation liquid.

[0111] S4. Preparation of finished coating products:

[0112] The color dot base paint, continuous phase and granulation liquid were mixed in a mass ratio of 6.2:2:1.8, and granulated with a granulator at 1000 rpm to prepare an environmentally friendly anti-fouling self-cleaning sand-containing colorful paint.

[0113] The environmentally friendly, anti-fouling, self-cleaning, sand-containing, multi-colored coating prepared in Examples 1 and 2 of the present invention was tested, and the results are shown in the following table. (Based on standards GB / T9780-2013 and GB / T 4343-2024)

[0114]

[0115] As can be seen from the table above, the environmentally friendly anti-fouling self-cleaning sand-containing multi-color paint of the embodiment of the present invention meets the basic performance requirements of conventional exterior walls. The environmentally friendly anti-fouling self-cleaning sand-containing multi-color paint is different from previous similar products. The photocatalytic material is doped titanium dioxide, which can function under visible light and even weak light conditions. Doped titanium dioxide can generate highly oxidizing hydroxyl radicals (·OH) and superoxide radicals (·O2 - ) is used for degrading organic pollutants, sterilizing, and air purification. It decomposes organic matter attached to the surface through photocatalysis, achieving a self-cleaning function. Hydrophobic modifiers (fluorocarbon modifiers and silane coupling agents) are added to the coating to form a hydrophobic layer on the material surface through a hydrolysis-condensation reaction. Air is trapped in the micro-nanostructure, forming an air cushion, which reduces the contact area between the water droplet and the surface and increases the contact angle. This creates a super-hydrophobic surface similar to the "lotus leaf effect," effectively improving the self-cleaning efficiency of the coating.

[0116] In addition, the components designed in the present invention are all universal standard parts or components known to those skilled in the art. Their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods. They can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to internal structures and methods.

[0117] The embodiments disclosed in the present invention are preferred embodiments, but are not limited to them. Ordinary technicians in this field can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. As long as they do not deviate from the spirit of the present invention, they are all within the scope of protection of the present invention.

Claims

1. An environmentally friendly anti-fouling self-cleaning sand-containing colorful paint, characterized in that: It is composed of the following components in the following mass ratios: Color dot base paint: continuous phase: granulation liquid = 6-6.5:2-3:2-3; in: The color dot base paint comprises deionized water, fungicide, dispersant, nano silicon dioxide, defoamer, cellulose A, cellulose B, film-forming aid, antifreeze agent, pH regulator, photocatalytic material, water-based resin base material, cross-linking agent, modified protective glue and colored sand; The continuous phase includes deionized water, preservatives, antifreeze agents, bentonite, hydrophobic modifiers, cross-linking agents, defoaming agents, thickeners and film-forming aids; The granulation liquid comprises deionized water, modified protective glue, preservative and anti-settling agent.

2. The environmentally friendly anti-fouling self-cleaning sand-containing multi-color coating according to claim 1, characterized in that: The color point base paint comprises, by weight: 140-200 parts of deionized water, 1-2 parts of fungicide, 1-2 parts of dispersant, 10-15 parts of nano-silicon dioxide, 1-1.5 parts of defoaming agent, 2-4 parts of cellulose A, 7-10 parts of cellulose B, 3-5 parts of film-forming aid, 3-5 parts of antifreeze agent, 1-2 parts of pH regulator, 10-20 parts of photocatalytic material, 20-40 parts of water-based resin base material, 60-90 parts of cross-linking agent, 3-5 parts of modified protective glue, and 200-300 parts of colored sand.

3. The environmentally friendly anti-fouling self-cleaning sand-containing multi-colored paint according to claim 1, characterized in that: The continuous phase comprises, by weight: 40-60 parts of deionized water, 2-3 parts of preservative, 10-15 parts of antifreeze agent, 2-4 parts of bentonite, 6-10 parts of hydrophobic modifier, 100-140 parts of cross-linking agent, 2-3 parts of defoaming agent, 2-4 parts of thickener, and 4-6 parts of film-forming aid.

4. The environmentally friendly anti-fouling self-cleaning sand-containing multi-color coating according to claim 1, characterized in that: The granulation liquid comprises, by weight: 150-200 parts of deionized water, 7-12 parts of modified protective glue, 0.3-0.6 parts of preservatives, and 0.5-1 parts of anti-settling agents.

5. The environmentally friendly anti-fouling self-cleaning sand-containing multi-colored paint according to claim 1, characterized in that: The photocatalytic material is doped titanium dioxide, which is used to decompose pollutants through photocatalysis under weak light conditions; The hydrophobic modifier is a fluorocarbon modifier or a silane coupling agent, which is used to construct a super-hydrophobic surface; The water-based resin base material is a self-crosslinking water-based acrylic resin.

6. The environmentally friendly anti-fouling self-cleaning sand-containing multi-colored paint according to claim 1, characterized in that: The particle size of the nano-silicon dioxide is 1-100 nanometers and the Mohs hardness is 7; the colored sand is natural colored sand or artificially dyed sand; the anti-settling agent is fumed silica, the pH value regulator is AMP-95, a mixture of 2-amino-2-methyl-1-propanol and water, and the bentonite is synthetic bentonite.

7. The environmentally friendly anti-fouling self-cleaning sand-containing multi-colored paint according to claim 1, characterized in that: The cellulose A is ethyl hydroxyethyl cellulose, and the cellulose B is hydroxyethyl cellulose.

8. The environmentally friendly anti-fouling self-cleaning sand-containing multi-colored paint according to claim 1, characterized in that: The bactericide is 2-methyl-4-isothiazoline-3-one, the dispersant is a polyacrylate ammonium salt dispersant, the film-forming aid is dipropylene glycol methyl ether, the thickener is an alkali swelling thickener, the cross-linking agent is an aqueous acrylic emulsion, the defoamer is a mineral oil defoamer, the modified protective glue is a synthetic silicate-magnesium aluminum silicate, and the antifreeze agent is monoethylene glycol.

9. A method for preparing the environmentally friendly anti-fouling self-cleaning sand-containing multi-color coating according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Preparation of color dot base paint: bactericide, cellulose, dispersant, defoamer, pH regulator, film-forming aid, and antifreeze agent are sequentially added to deionized water and mixed, followed by addition of nano-silica and photocatalytic material, followed by addition of water-based resin base, cross-linking agent, and modified protective adhesive, and finally, addition of colored sand; S2. Preparing a continuous phase: adding a preservative, an antifreeze agent, a hydrophobic modifier, and bentonite to deionized water and mixing, followed by adding a crosslinking agent, a defoaming agent, and a thickener; S3. Preparing a granulation solution: adding the modified protective colloid and the preservative to deionized water and mixing, and then adding an anti-settling agent; S4. Mix the color dot base paint, the continuous phase and the granulation liquid in proportion and granulate them to obtain a finished paint.

10. The preparation method according to claim 9, characterized in that: In the mixing step of the color dot base paint, the stirring speed is 450-1400 rpm, and the fineness of the liquid is ≤55 μm; During the continuous phase mixing step, the stirring speed is 450-800 rpm; In the step of mixing the granulation liquid, the stirring speed is 450-1200 rpm.

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