Efficient mildew-proof coating and processing technology thereof

Abstract

The invention belongs to the technical field of coatings, and provides a high-efficiency mildew-proof coating and a processing technology thereof, and the high-efficiency mildew-proof coating comprises the following components by weight: 25-30 parts of a solvent; 0.3 to 0.8 part of a thickening agent A; 0.3 to 0.8 part of a thickening agent B; 0.3 to 1 part of a dispersing agent; 0.2 to 0.5 part of a wetting agent; 30 to 40 parts of filler; 15 to 20 parts of coating emulsion; 0.5 to 0.8 part of a leveling agent; 0.2 to 0.3 part of a defoaming agent; 10 to 20 parts of an anti-mildew bactericide; 3-8 parts of a self-inhibition mildew inhibitor; and 1-1.5 parts of a coalescing agent. According to the scheme, the pH of a local area is reduced by utilizing metabolites of the mould, so that boric acid ester in the self-inhibition mould inhibitor is promoted to hydrolyze to generate boric acid, and the mould is inhibited and killed by utilizing the boric acid.

Description

Technical Field

[0001] The present invention relates to the field of coatings, and particularly relates to a high-efficiency mildew-proof coating and its processing technology. Background Art

[0002] The phenomenon of coating mildew is an intuitive manifestation of microbial activity and coating performance failure. Molds decompose carbohydrates and lipids in the coating through glycolysis and the tricarboxylic acid cycle, generating organic acids such as acetic acid, citric acid, and oxalic acid, which cause the coating to mildew and fall off, resulting in a decrease in aesthetics and erosion of the coating substrate. In addition, even if it does not fall off, the mildew spots on the coating surface are not easy to remove, and still need to be repainted, resulting in waste.

[0003] In the prior art, by adding a certain amount of mildew-proof agent to the coating, the coating has excellent adhesion, flame retardant performance, and can improve the mildew-proof performance of the system. The proportion of each component is reasonable, the compatibility is strong, the obtained coating has a long storage period, and is environmentally friendly, and can be used in fields such as architectural decoration. However, its mildew-proof agent is only simply added and cannot independently adjust the mildew-proof effect according to the growth characteristics of molds. Summary of the Invention

[0004] To solve the above problems, the present invention provides a high-efficiency mildew-proof coating and its processing technology, which utilizes the metabolites of molds to cause the pH of a local area to decrease, thereby promoting the hydrolysis of borate ester in the self-inhibiting mildew-proof agent to produce boric acid, and then using boric acid to inhibit and kill molds.

[0005] To achieve the above object, the technical solution of the present invention is: The present solution proposes a high-efficiency mildew-proof coating, which includes the following components by weight: Solvent 25 - 30 parts; Thickener A 0.3 - 0.8 part; Thickener B 0.3 - 0.8 part Dispersant 0.3 - 1 part; Wetting agent 0.2 - 0.5 part; Filler 30 - 40 parts; Coating emulsion 15 - 20 parts; Leveling agent 0.5 - 0.8 part; Defoaming agent 0.2 - 0.3 part; Mildew-proof and bactericidal agent 10 - 20 parts; Self-inhibiting mildew-proof agent 3 - 8 parts; Film-forming aid 1 - 1.5 parts; The self-inhibiting mildew-proof agent is prepared by the following steps: Step (1): Prepare an aqueous boric acid solution with a mass concentration of 5% - 20%, add porous material powder according to 10 - 20 times the mass of boric acid, stir and concentrate, and then dry to obtain boric acid-modified porous material; Step (2): Add the boric acid-modified porous material into ethylene glycol. After stirring and soaking, heat it to 120 - 130 °C under anaerobic conditions and react for 3 - 5 h, then separate to obtain the self-inhibiting mildew-proof agent.

[0006] This solution prepares a self-inhibiting mildew-proof agent. Mainly, borate esters are stored in the porous material. The acidic substances produced by the growth and metabolism of mildew itself cause the local pH to decrease, resulting in the hydrolysis of borate esters to produce boric acid, which inhibits the further growth of mildew and is beneficial for removing mildew spots. The porous material, as a storage container for borate esters, has a slow-release effect, which can prevent the borate esters from hydrolyzing too quickly and prevent the dissolved boric acid from hydrolyzing from flowing out and being lost. At the same time, the presence of borate esters can make the porous material better disperse in the coating. If the porous material is titanium dioxide porous powder, etc., the physical properties of the porous material itself, such as improving the antioxidant capacity of the coating itself, can also be utilized.

[0007] Preferably, the solvent is water; the thickener A is hydroxyethyl cellulose; the dispersant is an anionic surface dispersant; the wetting agent is a non-ionic surfactant; the mildew-proof and bactericidal agent is one or more of benzoate preservatives, isothiazolinone bactericides, or sorbate preservatives; the filler is one or more of kaolin powder, calcium carbonate powder, silicon dioxide powder, titanium dioxide powder; the leveling agent is a non-ionic leveling agent; the defoaming agent is low-viscosity liquid paraffin or a silicone defoaming agent; the thickener B is a polyacrylic acid copolymer; the coating emulsion is a styrene-acrylic emulsion; the film-forming aid is an alcohol ester compound.

[0008] Preferably, the high-efficiency mildew-proof coating further includes 1 - 2 parts of antifreeze and 0.1 - 0.2 parts of pH regulator; the antifreeze is propylene glycol; the pH regulator is aminomethyl propanol.

[0009] Preferably, in step (1), the porous material is one of zeolite powder, porous carbon powder, porous titanium dioxide powder, and porous silicon dioxide powder; the average particle size of the porous material is 1 - 5 μm.

[0010] Preferably, in step (1), the moisture content after stirring and concentration is 20% - 30%.

[0011] Preferably, in step (2), add the boric acid-modified porous material into ethylene glycol, add p-toluenesulfonic acid accounting for 0.1% - 0.5% of the mass of the boric acid-modified porous material, stir and soak, then heat to 120 - 130 °C under anaerobic conditions, react for 3 - 5 h, and after separation, remove the excess ethylene glycol by vacuum distillation to obtain the self-inhibiting mildew-proof agent.

[0012] This solution also proposes a processing technology for the above high-efficiency mildew-proof coating. Add materials according to the ratio, including the following steps: Step (a): Add a solvent, thickener A, dispersant, wetting agent, filler, coating emulsion, and mildew-proof and bactericidal agent into a sand mill for mixing and grinding to obtain a mixed material A; Step (b): Add the remaining materials into the mixed material A and stir thoroughly to obtain a high-efficiency mildew-proof coating.

[0013] Preferably, in step (a), in the mixed material A, the average particle size of the material particles is less than 10 μm.

[0014] Preferably, in step (b), the stirring process for thorough stirring is: first stir at 800 - 1000 r / min for 30 - 60 min, and then stir at 300 - 500 r / min for 30 - 60 min.

[0015] Since the porous material is stored in the borate ester in this solution, it is not suitable to be added in step (a). Adding it to the sand mill in step (a) may cause the collapse of the porous material, resulting in premature hydrolysis of the borate ester during actual use.

[0016] Compared with the prior art, the present invention has the following advantages: 1. The high-efficiency mildew-proof coating prepared by this solution, on the basis of a conventional mildew-proof agent, adds a self-inhibiting mildew-proof agent. The self-inhibiting mildew-proof agent utilizes the metabolites of the mold itself to cause the pH of the local area to decrease, thereby promoting the hydrolysis of the borate ester in the self-inhibiting mildew-proof agent to produce boric acid. The boric acid is used to inhibit and kill the mold, thus achieving a mildew-proof and bactericidal effect. Moreover, the remaining mildew spots are easy to remove, and the prevention and control effect on the mold can be automatically adjusted according to the growth and metabolism of the mold.

[0017] 2. The preparation process of this solution is simple and can adapt to large-scale production. Specific Embodiments

[0018] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Example 1 A high-efficiency mildew-proof coating, comprising the following components by weight: Water 27 parts; Thickener A hydroxyethyl cellulose 0.5 part; Thickener B TT-935(302) 0.5 part Dispersant 5040(402) 0.5 part; Wetting agent 405(102) 0.4 parts; Calcined kaolin 20 parts and calcium carbonate powder 15 parts; Styrene-acrylic emulsion 17 parts; Leveling agent 2020(304) 0.6 parts; Defoaming agent A10(301) 0.25 parts; Mildew and bactericide 998A(206) 15 parts; Self-inhibiting mildew-proof agent 5 parts; Film-forming aid 202 1.2 parts; Antifreeze propylene glycol(201) 1.5 parts; pH regulator aminomethylpropanol 0.15 parts; The self-inhibiting mildew-proof agent is prepared by the following steps: Step (1): Prepare an aqueous boric acid solution with a mass concentration of 15%, add porous titanium dioxide powder with an average particle size of 3 μm according to 15 times the mass of boric acid, stir and concentrate until the water content is 25%, and dry to obtain boric acid-modified porous material; Step (2): Add the boric acid-modified porous material to ethylene glycol, add p-toluenesulfonic acid accounting for 0.3% of the mass of the boric acid-modified porous material, stir and soak, then heat to 125 °C under anaerobic conditions and react for 4 h. After separation, remove the excess ethylene glycol by vacuum distillation to obtain the self-inhibiting mildew-proof agent; The solvent is water; the thickener A is hydroxyethyl cellulose; the dispersant is an anionic surface dispersant, commercially available model 5040(402); the wetting agent is a non-ionic surfactant, commercially available model 405(102); the mildew and bactericide is a benzoate preservative, commercially available model 998A(206); the leveling agent is a non-ionic leveling agent, commercially available model 2020(304); the defoaming agent is a low-viscosity liquid paraffin, commercially available model 2020(304); the thickener B is a polyacrylic acid copolymer; the coating emulsion is a styrene-acrylic type emulsion; the film-forming aid is an alcohol ester compound, commercially available model 202; Add the materials according to the ratio, and the high-efficiency mildew-proof coating is prepared by the following steps: Step (a): Add the solvent, thickener A, dispersant, wetting agent, filler, coating emulsion, and mildew and bactericide to a sand mill and mix and grind at a rate of 1200 r / min for 30 min to obtain a mixed material A; the average particle size of the material particles is less than 10 μm; Step (b): Add the remaining materials to the mixed material A, first stir at 1000 r / min for 60 min, and then stir at 300 r / min for 30 min to obtain the high-efficiency mildew-proof coating.

[0020] Example Two A high-efficiency mildew-proof coating, comprising the following components by weight: 30 parts of water; 0.8 part of thickener A, hydroxyethyl cellulose; 0.8 part of thickener B, TT-935(302) 0.9 part of dispersant 5040(402); 0.5 part of wetting agent 405(102); 10 parts of calcium carbonate powder, 10 parts of silicon dioxide powder, 10 parts of titanium dioxide powder; 20 parts of styrene-acrylic emulsion; 0.8 part of leveling agent 2020(304); 0.3 part of defoaming agent A10(301); 20 parts of mildew and bactericide 998A(206); 8 parts of self-inhibiting mildew agent; 1.5 parts of film-forming aid 202 2 parts of antifreeze, propylene glycol(201); 0.2 part of pH regulator, aminomethyl propanol; The self-inhibiting mildew agent is prepared through the following steps: Step (1): Prepare an aqueous boric acid solution with a mass concentration of 20%. Add zeolite powder with an average particle size of 5 μm according to 20 times the mass of boric acid. After stirring and concentrating, the water content is 30%. Dry it to obtain boric acid-modified porous material; Step (2): Add the boric acid-modified porous material into ethylene glycol. Add p-toluenesulfonic acid accounting for 0.5% of the mass of the boric acid-modified porous material. After stirring and soaking, heat it to 130 °C under anaerobic conditions and react for 3 h. After separation, remove the excessive ethylene glycol by vacuum distillation to obtain the self-inhibiting mildew agent; The solvent is water; the thickener A is hydroxyethyl cellulose; the dispersant is an anionic surface dispersant, commercially available model 5040(402); the wetting agent is a non-ionic surfactant, commercially available model 405(102); the mildew and bactericide is a benzoate preservative, commercially available model 998A(206); the leveling agent is a non-ionic leveling agent, commercially available model 2020(304); the defoaming agent is low-viscosity liquid paraffin, commercially available model 2020(304); the thickener B is a polyacrylic acid copolymer; the coating emulsion is a styrene-acrylic emulsion; the film-forming aid is an alcohol ester compound, commercially available model 202; Add the materials according to the ratio. The above high-efficiency mildew-proof coating is prepared through the following steps: Step (a): Add the solvent, thickener A, dispersant, wetting agent, filler, coating emulsion, and mildew and bactericide into a sand mill and mix and grind at a rate of 1200 r / min for 30 min to obtain mixture A; the average particle size of the material particles is less than 10 μm; Step (b): Add the remaining materials to Mixing A. First, stir at 1000 r / min for 60 min, and then stir at 500 r / min for 30 min to obtain the high-efficiency mildew-proof coating.

[0021] Example 3 A high-efficiency mildew-proof coating, comprising the following components by weight: Water 26 parts; Thickener A hydroxyethyl cellulose 0.4 part; Thickener B TT-935(302) 0.4 part Dispersant 5040(402) 0.5 part; Wetting agent 405(102) 0.3 part; Calcined kaolin 10 parts, titanium dioxide powder 10 parts and calcium carbonate powder 15 parts; Styrene-acrylic emulsion 15 parts; Leveling agent 2020(304) 0.5 part; Defoaming agent A10(301) 0.2 part; Mildew-proof and bactericidal agent 998A(206) 10 parts; Self-inhibiting mildew-proof agent 3 parts; Film-forming aid 202 1 part; The self-inhibiting mildew-proof agent is prepared by the following steps: Step (1): Prepare an aqueous boric acid solution with a mass concentration of 8%. Add silica powder with an average particle size of 2 μm at 10 times the mass of boric acid. After stirring and concentrating, the water content is 20%. Dry to obtain the boric acid-modified porous material; Step (2): Add the boric acid-modified porous material to ethylene glycol. Add p-toluenesulfonic acid at 0.1% of the mass of the boric acid-modified porous material. After stirring and soaking, heat to 120 °C under anaerobic conditions and react for 5 h. After separation, remove the excess ethylene glycol by vacuum distillation to obtain the self-inhibiting mildew-proof agent; Preferably, the solvent is water; the thickener A is hydroxyethyl cellulose; the dispersant is an anionic surface dispersant, commercially available model 5040(402); the wetting agent is a non-ionic surfactant, commercially available model 405(102); the mildew-proof and bactericidal agent is a benzoate preservative, commercially available model 998A(206); the leveling agent is a non-ionic leveling agent, commercially available model 2020(304); the defoaming agent is low-viscosity liquid paraffin, commercially available model 2020(304); the thickener B is a polyacrylic acid copolymer; the coating emulsion is a styrene-acrylic emulsion; the film-forming aid is an alcohol ester compound, commercially available model 202; Add the materials according to the ratio. The above high-efficiency mildew-proof coating is prepared by the following steps: Step (a): Add the solvent, thickener A, dispersant, wetting agent, filler, coating emulsion, and mildew and bactericide into a sand mill and mix and grind at a rate of 1200 r / min for 30 min to obtain a mixed material A; the average particle size of the material particles is less than 10 μm; Step (b): Add the remaining materials into the mixed material A, first stir at 800 r / min for 60 min, and then stir at 400 r / min for 50 min to obtain a high-efficiency mildew-proof coating.

[0022] Comparative Example 1 A high-efficiency mildew-proof coating, comprising the following components by weight: Water 27 parts; Thickener A hydroxyethyl cellulose 0.5 part; Thickener B TT-935(302) 0.5 part Dispersant 5040(402) 0.5 part; Wetting agent 405(102) 0.4 part; Calcined kaolin 20 parts and calcium carbonate powder 15 parts; Styrene-acrylic emulsion 17 parts; Leveling agent 2020(304) 0.6 part; Defoaming agent A10(301) 0.25 part; Mildew and bactericide 998A(206) 15 parts; Film-forming aid 202 1.2 parts; Antifreeze propylene glycol(201) 1.5 parts; pH regulator aminomethyl propanol 0.15 part; The solvent is water; the thickener A is hydroxyethyl cellulose; the dispersant is an anionic surface dispersant, commercially available model 5040(402); the wetting agent is a non-ionic surfactant, commercially available model 405(102); the mildew and bactericide is a benzoate preservative, commercially available model 998A(206); the filler is one or more of kaolin powder, calcium carbonate powder, silica powder, and titanium dioxide powder; the leveling agent is a non-ionic leveling agent, commercially available model 2020(304); the defoaming agent is low-viscosity liquid paraffin, commercially available model 2020(304); the thickener B is a polyacrylic acid copolymer; the coating emulsion is a styrene-acrylic emulsion; the film-forming aid is an alcohol ester compound, commercially available model 202; Add the materials according to the ratio, and the above high-efficiency mildew-proof coating is prepared by the following steps: Step (a): Add the solvent, thickener A, dispersant, wetting agent, filler, coating emulsion, and mildew and bactericide into a sand mill and mix and grind at a rate of 1200 r / min for 30 min to obtain a mixed material A; the average particle size of the material particles is less than 10 μm; Step (b): Add the remaining materials to Mixing A. First, stir at 1000 r / min for 60 min, and then stir at 300 r / min for 30 min to obtain the high-efficiency mildew-proof coating.

[0023] Comparative Example 2 A high-efficiency mildew-proof coating, comprising the following components by weight: Water 27 parts; Thickener A hydroxyethyl cellulose 0.5 part; Thickener B TT-935(302) 0.5 part Dispersant 5040(402) 0.5 part; Wetting agent 405(102) 0.4 part; Calcined kaolin 20 parts and calcium carbonate powder 15 parts; Styrene-acrylic emulsion 17 parts; Leveling agent 2020(304) 0.6 part; Defoaming agent A10(301) 0.25 part; Mildew-proof and bactericidal agent 998A(206) 15 parts; Self-inhibiting mildew-proof agent 5 parts; Film-forming aid 202 1.2 parts; Antifreeze propylene glycol(201) 1.5 parts; pH regulator aminomethylpropanol 0.15 part; The self-inhibiting mildew-proof agent is prepared by the following steps: Step (1): Prepare an aqueous boric acid solution with a mass concentration of 15%. Add porous titanium dioxide powder with an average particle size of 3 μm at 15 times the mass of boric acid. After stirring and concentrating, the water content is 25%, and then dry to obtain the boric acid-modified porous material; Step (2): Add the boric acid-modified porous material to ethylene glycol, add p-toluenesulfonic acid at 0.3% of the mass of the boric acid-modified porous material. After stirring and soaking, heat to 125 °C under anaerobic conditions and react for 4 h. After separation, remove the excess ethylene glycol by vacuum distillation to obtain the self-inhibiting mildew-proof agent; The solvent is water; the thickener A is hydroxyethyl cellulose; the dispersant is an anionic surface dispersant, and the commercially available model is 5040(402); the wetting agent is a non-ionic surfactant, and the commercially available model is 405(102); the mildew-proof and bactericidal agent is a benzoate preservative, and the commercially available model is 998A(206); the filler is one or more of kaolin powder, calcium carbonate powder, silica powder, and titanium dioxide powder; the leveling agent is a non-ionic leveling agent, and the commercially available model is 2020(304); the defoaming agent is low-viscosity liquid paraffin, and the commercially available model is 2020(304); the thickener B is a polyacrylic acid copolymer; the coating emulsion is a styrene-acrylic emulsion; the film-forming aid is an alcohol ester compound, and the commercially available model is 202; Add materials according to the ratio. The above-mentioned high-efficiency mildew-proof coating is prepared through the following steps: Step (a): Add a solvent, thickener A, dispersant, wetting agent, filler, coating emulsion, and mildew-proof and bactericidal agent into a sand mill and mix and grind at a rate of 1200 r / min for 30 min to obtain mixture A; the average particle size of the material particles is less than 10 μm; Step (b): Add the remaining materials into mixture A. First, stir at 1000 r / min for 60 min, and then stir at 300 r / min for 30 min to obtain the high-efficiency mildew-proof coating.

[0024] Comparative Example 3 A high-efficiency mildew-proof coating, comprising the following components by weight: Water 27 parts; Thickener A hydroxyethyl cellulose 0.5 part; Thickener B TT-935(302) 0.5 part Dispersant 5040(402) 0.5 part; Wetting agent 405(102) 0.4 part; Calcined kaolin 20 parts and calcium carbonate powder 15 parts; Styrene-acrylic emulsion 17 parts; Leveling agent 2020(304) 0.6 part; Defoaming agent A10(301) 0.25 part; Mildew-proof and bactericidal agent 998A(206) 15 parts; Self-inhibiting mildew-proof agent 5 parts; Film-forming aid 202 1.2 parts; Antifreeze propylene glycol(201) 1.5 parts; pH regulator aminomethyl propanol 0.15 part; The self-inhibiting mildew-proof agent is prepared through the following steps: Step (1): Prepare an aqueous boric acid solution with a mass concentration of 15%. Add porous titanium dioxide powder with an average particle size of 10 μm in an amount 15 times the mass of boric acid. After stirring and concentration, the water content is 25%, and then dry to obtain boric acid-modified porous material; Step (2): Add the boric acid-modified porous material into ethylene glycol, add p-toluenesulfonic acid in an amount of 0.3% of the mass of the boric acid-modified porous material. After stirring and soaking, heat to 125 °C under anaerobic conditions and react for 4 h. After separation, remove the excess ethylene glycol by vacuum distillation to obtain the self-inhibiting mildew-proof agent; The solvent is water; thickener A is hydroxyethyl cellulose; the dispersant is an anionic surface dispersant, commercially available model 5040(402); the wetting agent is a non-ionic surfactant, commercially available model 405(102); the mildew and bactericide is a benzoate preservative, commercially available model 998A(206); the leveling agent is a non-ionic leveling agent, commercially available model 2020(304); the defoaming agent is a low-viscosity liquid paraffin, commercially available model 2020(304); thickener B is a polyacrylic acid copolymer; the coating emulsion is a styrene-acrylic emulsion; the film-forming aid is an alcohol ester compound, commercially available model 202; Add the materials according to the ratio, and the high-efficiency mildew-proof coating is prepared by the following steps: Step (a): Add the solvent, thickener A, dispersant, wetting agent, filler, coating emulsion, and mildew and bactericide to a sand mill and mix and grind at a rate of 1200 r / min for 30 min to obtain a mixed material A; the average particle size of the material particles is less than 10 μm; Step (b): Add the remaining materials to the mixed material A, first stir at 1000 r / min for 60 min, and then stir at 300 r / min for 30 min to obtain the high-efficiency mildew-proof coating.

[0025] Comparative Example 4 A high-efficiency mildew-proof coating, comprising the following components by weight: Water 27 parts; Thickener A hydroxyethyl cellulose 0.5 part; Thickener B TT-935(302) 0.5 part Dispersant 5040(402) 0.5 part; Wetting agent 405(102) 0.4 part; Calcined kaolin 20 parts and calcium carbonate powder 15 parts; Styrene-acrylic emulsion 17 parts; Leveling agent 2020(304) 0.6 part; Defoaming agent A10(301) 0.25 part; Mildew and bactericide 998A(206) 15 parts; Self-inhibiting mildew-proof agent 5 parts; Film-forming aid 202 1.2 parts; Antifreeze propylene glycol(201) 1.5 parts; pH regulator aminomethyl propanol 0.15 part; The self-inhibiting mildew-proof agent is prepared by the following steps: Step (1): Prepare a boric acid aqueous solution with a mass concentration of 15%, add porous titanium dioxide powder with an average particle size of 3 μm according to 15 times the mass of boric acid, stir and concentrate until the water content is 25%, and dry to obtain a boric acid-modified porous material; Step (2): Add the boric acid-modified porous material into ethylene glycol, add p-toluenesulfonic acid accounting for 0.3% of the mass of the boric acid-modified porous material, stir and soak it. Then, heat it to 125 °C under anaerobic conditions and react for 4 h. After separation, remove the excessive ethylene glycol by vacuum distillation to obtain the self-inhibiting mildew preventive agent. The solvent is water; the thickener A is hydroxyethyl cellulose; the dispersant is an anionic surface dispersant, with the commercial model 5040(402); the wetting agent is a non-ionic surfactant, with the commercial model 405(102); the mildew and bactericide is a benzoate preservative, with the commercial model 998A(206); the leveling agent is a non-ionic leveling agent, with the commercial model 2020(304); the defoaming agent is low-viscosity liquid paraffin, with the commercial model 2020(304); the thickener B is a polyacrylic acid copolymer; the coating emulsion is a styrene-acrylic emulsion; the film-forming auxiliary agent is an alcohol ester compound, with the commercial model 202. Add the materials according to the ratio. The above-mentioned high-efficiency mildew-proof coating is prepared through the following steps: Step (a): Add the solvent, thickener A, dispersant, wetting agent, filler, coating emulsion, and mildew and bactericide into a sand mill and mix and grind them at a rate of 1200 r / min for 30 min to obtain the mixed material A; the average particle size of the material particles is less than 10 μm. Step (b): Add the remaining materials into the mixed material A, first stir at 1000 r / min for 60 min, and then stir at 300 r / min for 30 min to obtain the high-efficiency mildew-proof coating.

[0026] Comparative Example 5 A high-efficiency mildew-proof coating, including the following components by weight: Water 27 parts; Thickener A hydroxyethyl cellulose 0.5 part; Thickener B TT-935(302) 0.5 part Dispersant 5040(402) 0.5 part; Wetting agent 405(102) 0.4 part; Calcined kaolin 20 parts and calcium carbonate powder 15 parts; Styrene-acrylic emulsion 17 parts; Leveling agent 2020(304) 0.6 part; Defoaming agent A10(301) 0.25 part; Mildew and bactericide 998A(206) 15 parts; Self-inhibiting mildew preventive agent 5 parts; Film-forming auxiliary agent 202 1.2 parts; Antifreeze propylene glycol(201) 1.5 parts; pH regulator aminomethyl propanol 0.15 part; The self-inhibiting mildew-proof agent is prepared through the following steps: Step (1): Prepare an aqueous boric acid solution with a mass concentration of 15%. Add porous titanium dioxide powder with an average particle size of 3 μm at 15 times the mass of boric acid. After stirring and concentration, the water content is 25%. Dry to obtain the boric acid-modified porous material; Step (2): Add the boric acid-modified porous material to ethylene glycol. Add p-toluenesulfonic acid at 0.3% of the mass of the boric acid-modified porous material. After stirring and soaking, heat to 125 °C under anaerobic conditions and react for 4 h. After separation, remove the excess ethylene glycol by vacuum distillation to obtain the self-inhibiting mildew-proof agent; The solvent is water; thickener A is hydroxyethyl cellulose; the dispersant is an anionic surface dispersant, commercially available model 5040(402); the wetting agent is a non-ionic surfactant, commercially available model 405(102); the mildew-proof and bactericidal agent is a benzoate preservative, commercially available model 998A(206); the leveling agent is a non-ionic leveling agent, commercially available model 2020(304); the defoaming agent is low-viscosity liquid paraffin, commercially available model 2020(304); thickener B is a polyacrylic acid copolymer; the coating emulsion is a styrene-acrylic emulsion; the film-forming aid is an alcohol ester compound, commercially available model 202; Add materials according to the ratio. The above high-efficiency mildew-proof coating is prepared through the following steps: Step (a): Add the solvent, thickener A, dispersant, wetting agent, filler, coating emulsion, mildew-proof and bactericidal agent, and self-inhibiting mildew-proof agent to a sand mill and mix and grind at a rate of 1200 r / min for 30 min to obtain mixture A; the average particle size of the material particles is less than 10 μm; Step (b): Add the remaining materials to mixture A. First, stir at 1000 r / min for 60 min, and then stir at 300 r / min for 30 min to obtain the high-efficiency mildew-proof coating.

[0027] Performance testing: 1. Evaluate the mildew-proof grade according to GB / T 1741-2020; 2. Clean the plaque and observe the ease of plaque cleaning; 3. Evaluate the coating adhesion according to GB / T 9286.

[0028] The test results are shown in Table 1.

[0029] Table 1 From the above results, it can be seen that the high-efficiency mildew-proof coatings prepared in Examples 1 to 3 have better mildew-proof effects, mildew stain removal effects, and adhesion strengths than the high-efficiency mildew-proof coatings prepared in Comparative Examples 1 to 5.

[0030] The main difference between Comparative Example 1 and Example 1 is that Comparative Example 1 did not add a self-inhibiting mildew-proof agent. Therefore, the mildew-proof effect is not as good as that of Example 1, and the traces after mildew spots are generated are difficult to remove.

[0031] The difference between Comparative Example 2 and Example 1 is that the self-inhibiting mildew-proof agent is in excess. The self-inhibiting mildew-proof agent uses a porous material as a storage container for borate esters, which reduces the adsorption force of the coating to a certain extent. This may be due to insufficient affinity between the porous material and the coating.

[0032] The difference between Comparative Example 3 and Example 1 is that the particles of the self-inhibiting mildew-proof agent are too coarse, which will also reduce the adsorption force of the coating. At the same time, fewer active sites of the porous material result in poorer mildew-proof ability and adhesion effect.

[0033] The difference between Comparative Example 4 and Example 1 is that the moisture content is too high after stirring and concentration in step (2). This will cause uneven distribution of boric acid content in the boric acid-modified porous material obtained in step (1), resulting in a decline in comprehensive performance.

[0034] The difference between Comparative Example 5 and Example 1 is that the mildew-proof fungicide is added in step (a), which may lead to the collapse of the porous structure and premature precipitation of borate, resulting in a poor mildew-proof effect.

[0035] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve substantially the same technical problems and achieve substantially the same technical effects are all covered by the protection scope of the present invention.

Claims

1. An efficient mildew-proof paint, characterized in that, The composition comprises the following components in parts by weight: 25-30 parts of solvent; Thickener A 0.3-0.8 part; Thickener B 0.3-0.8 parts Dispersant 0.3-1 part; Wetting agent 0.2-0.5 parts; 30-40 parts of filler; 15-20 parts of coating emulsion; Leveling agent 0.5-0.8 parts; Defoaming agent 0.2-0.3 parts; 10-20 parts of mildew and fungicide; 3-8 parts of self-inhibiting mildew inhibitor; 1-1.5 parts of film-forming aid; The self-inhibiting mildewcide is prepared by the following steps: Step (1): prepare a boric acid aqueous solution with a mass concentration of 5%-20%, add 10-20 times the mass of the boric acid into the porous material powder, stir and concentrate, and then dry to obtain the boric acid modified porous material; Step (2): Add the boric acid-modified porous material into ethylene glycol, stir and soak it, heat it to 120-130° C. under anaerobic conditions, react for 3-5 hours, and separate the self-inhibiting mildew inhibitor.

2. The high-efficiency mildew-proof coating according to claim 1, characterized in that The solvent is water; the thickener A is hydroxyethyl cellulose; the dispersant is an anionic surface dispersant; the wetting agent is a non-ionic surfactant; the mildew and fungicide is one or more of benzoate preservatives, isothiazolinone fungicides or sorbate preservatives; the filler is one or more of kaolin powder, calcium carbonate powder, silicon dioxide powder and titanium dioxide powder; the leveling agent is a non-ionic leveling agent; the defoamer is a low-viscosity liquid paraffin or a silicone defoamer; the thickener B is a polyacrylic acid copolymer; the coating emulsion is a styrene-acrylic emulsion; and the film-forming aid is an alcohol ester compound.

3. The high-efficiency mildew-proof paint according to claim 1, characterized in that, The high-efficiency mildew-proof paint also includes 1-2 parts of antifreeze agent and 0.1-0.2 parts of pH regulator; the antifreeze agent is propylene glycol; and the pH regulator is aminomethyl propanol.

4. The high-efficiency mildew-proof coating according to claim 1, characterized in that, In step (1), the porous material is one of zeolite powder, porous carbon powder, porous titanium dioxide powder, and porous silicon dioxide powder; and the average particle size of the porous material is 1-5 μm.

5. The high-efficiency mildew-proof coating according to claim 1, characterized in that, In step (1), the water content after stirring and concentrating is 20%-30%.

6. The high-efficiency mildew-proof coating according to claim 1, wherein In step (2), the boric acid-modified porous material is added to ethylene glycol, and 0.1%-0.5% of p-toluenesulfonic acid is added based on the mass of the boric acid-modified porous material. After stirring and soaking, the material is heated to 120-130° C. under anaerobic conditions, reacted for 3-5 hours, and after separation, the excess ethylene glycol is removed by reduced pressure distillation to obtain a self-inhibiting mildew inhibitor.

7. A processing technology of the high-efficiency mildew-proof coating according to any one of claims 1-6, characterized in that, Add materials according to the proportion, including the following steps: Step (a): adding a solvent, a thickener A, a dispersant, a wetting agent, a filler, a coating emulsion, and a mildew and fungicide into a sand mill, mixing and grinding to obtain a mixture A; Step (b): Add the remaining materials to the mixed material A and stir thoroughly to obtain a highly effective mildew-proof coating.

8. The processing technology of the high-efficiency mildew-proof coating according to claim 7, characterized in that, In step (a), in the mixture A, the average particle size of the material particles is less than 10 μm.

9. The processing technology of the high-efficiency mildew-proof coating according to claim 7, characterized in that, In step (b), the stirring process for sufficient stirring is: first stirring at 800-1000 r / min for 30-60 min, and then stirring at 300-500 r / min for 30-60 min.

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