Preparation method of anti-oxidation coating

Abstract

The invention discloses a preparation method of an anti-oxidation coating, and relates to the technical field of coatings. Hydroxybenzotriazole is firstly used for esterifying modified acrylic acid, then the modified acrylic acid is used for preparing the modified acrylic resin coating, a benzotriazole structure has high hardness and rigidity and also has good ultraviolet absorption performance, the degradation effect of ultraviolet rays on acrylic resin can be reduced, the durability of the coating is further improved, and the service life of the coating is prolonged. The novel microcapsule wall material is prepared by modifying the microcapsule wall material with the hydrophobic compound and then coating the microcapsule wall material with the antioxidant, and the microcapsule wall material modified with the hydrophobic compound can effectively prevent external moisture and oxygen from entering the interior of the microcapsule, so that the stability of the coating in a humid environment is improved; and the coating of the microcapsule protects the core material antioxidant from being influenced by the external environment, the antioxidant is slowly and continuously released in the coating, and the oxidation reaction of the coating is effectively inhibited for a long time. The anti-oxidation coating prepared by the invention has the effects of wear resistance and durability.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to a method for preparing an antioxidant coating. Background Technology

[0002] In recent years, with the rapid development of industrial technology, the oxidation of materials under harsh environments such as high temperature and high humidity has become increasingly prominent, seriously affecting the service life and performance stability of materials. The development of antioxidant coatings has become a key direction for solving this problem. Traditional coatings have significant shortcomings in high temperature resistance and oxidation resistance, especially in aerospace, energy, and automotive fields, where materials need to operate stably for extended periods under extreme conditions. Therefore, there is an urgent need to develop new antioxidant coatings.

[0003] Therefore, developing new coatings that combine high-efficiency antioxidant properties, environmental friendliness, and economy has significant scientific research value and practical application significance. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing antioxidant coatings to solve the problems existing in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an antioxidant coating, which, by weight, is made of the following components: 40-60 parts modified acrylic resin, 1-3 parts dispersant, 5-10 parts thickener, 3-5 parts film-forming aid, 0.5-1 part defoamer, 1-3 parts novel microcapsule antioxidant, 10-15 parts filler, and 30-45 parts deionized water; The modified acrylic resin is prepared by modifying acrylate with 1-hydroxybenzotriazole and then polymerizing it with acrylate and its derivatives. The novel microcapsule antioxidant is prepared by modifying the microcapsule wall material with a hydrophobic compound and then coating it with an antioxidant.

[0006] Furthermore, the dispersant is one of sodium oleate, sodium acetate, sodium sulfate, and sodium dodecyl sulfonate; the thickener is a polyurethane thickener.

[0007] Furthermore, the film-forming aid is an alcohol ester film-forming aid; the defoamer is a polysiloxane; and the filler is one or more of silica, barium sulfate, and calcium sulfate.

[0008] Furthermore, the hydrophobic compound is one of cinnamic acid, benzoic acid and its derivatives, or naphthoic acid and its derivatives.

[0009] Furthermore, the microcapsule wall material is one of gelatin, sodium alginate, gum arabic, or chitosan, and the antioxidant is an oil-phase antioxidant.

[0010] Furthermore, a method for preparing an antioxidant coating includes the following preparation steps: (1) A modified wall material is obtained by grafting a hydrophobic compound onto the wall material of a microcapsule. The modified wall material is dissolved in a 1 wt% acetic acid solution to prepare a 1 wt% modified wall material solution. An oil phase antioxidant of 0.6 to 0.8 times the mass of the modified wall material is added to obtain a wall core mixture. An emulsifier of 0.0045 to 0.0060 times the mass of the wall core mixture is added. The mixture is stirred at 12000 to 13000 rpm for 10 to 15 min, homogenized, and spray-dried to obtain a novel microcapsule antioxidant. (2) Mix 1-hydroxybenzotriazole and dimethyl sulfoxide in a mass ratio of 1:3~5, add acrylic acid of 1.2~1.5 times the mass of hydroxybenzotriazole, stir at 300~400 r / min for 10~15 min to obtain a mixture, add p-toluenesulfonic acid of 0.05~0.1 times the mass of the mixture, react at 78~79℃ and 100~150 r / min for 6~8 h, extract, and then remove the solvent by vacuum distillation to obtain modified acrylate; (3) Mix acrylate and its derivatives with modified acrylate at a mass ratio of 5.3~7.6:1 to obtain a prepolymer solution, dissolve it in 2~3 times the mass of methyl ethyl ketone, add 0.3~0.4 times the mass of the prepolymer solution as an initiator, stir at 400~500 r / min for 20~30 min, react at 80~140℃ for 3~4 h, and cool naturally to obtain modified acrylic resin; (4) Mix by weight: 40-60 parts of modified acrylic resin, 1-3 parts of dispersant, 5-10 parts of thickener, 3-5 parts of film-forming aid, 0.5-1 part of defoamer, 1-3 parts of novel microcapsule antioxidant, 10-15 parts of filler, and 30-45 parts of deionized water. Stir, filter, and degas to obtain antioxidant coating.

[0011] Furthermore, the spray drying conditions in step (1) are: inlet air temperature 180℃ and outlet air temperature 80~85℃.

[0012] Furthermore, the emulsifier in step (1) is Tween 80.

[0013] Furthermore, in step (1), homogenization is performed at 35 MPa for 10-15 min.

[0014] Furthermore, the catalyst in step (3) is benzoyl peroxide.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: This invention prepares modified acrylic resin by esterifying acrylic acid with hydroxybenzotriazole, and then adds a novel microencapsulated antioxidant to obtain an antioxidant coating, thereby achieving wear-resistant and durable effects.

[0016] First, hydroxybenzotriazole is used to esterify and modify acrylate, and then the modified acrylate is used to prepare modified acrylic resin coatings. The benzotriazole structure has high hardness and rigidity. By introducing the benzotriazole structure into the acrylic resin through esterification, it becomes more wear-resistant, reduces surface wear caused by friction, and extends the service life of the coating. In addition, it also has good ultraviolet absorption properties, which can convert ultraviolet rays into harmless heat energy, thereby reducing the degradation effect of ultraviolet rays on acrylic resin and further improving the durability of the coating. At the same time, the benzotriazole group is chemically bonded to the resin backbone, avoiding the migration and volatilization problems of traditional additive ultraviolet absorbers.

[0017] Secondly, a novel microcapsule wall material was prepared by modifying the microcapsule wall material with hydrophobic compounds and then coating it with antioxidants. The hydrophobic compound-modified microcapsule wall material can effectively prevent external moisture and oxygen from entering the microcapsule, thereby reducing the contact opportunities between the antioxidant and moisture and oxygen, reducing the possibility of oxidation, improving the storage stability and performance of the antioxidant, and improving the stability of the coating in humid environments. Furthermore, the microcapsule coating protects the core material antioxidant from the influence of the external environment, allowing the antioxidant to be released slowly and continuously in the coating, effectively inhibiting the oxidation reaction of the coating in the long term, preventing the antioxidant from prematurely failing during storage and use, and improving the stability and durability of the coating. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] To more clearly illustrate the method provided by the present invention, the following embodiments are provided in detail. The testing methods for various indicators of an antioxidant coating prepared in the following embodiments are as follows: Antioxidant properties: Antioxidant coatings prepared in the same mass as those in the examples and comparative examples were poured into molds and cured to obtain an antioxidant coating film. The antioxidant properties were tested according to GB / T 1865-2009 "Artificial weathering and artificial radiation exposure of paints and varnishes".

[0020] Abrasion resistance: Antioxidant coatings prepared in the same mass as those in the examples and comparative examples were poured into a mold and cured to obtain an antioxidant coating film. The abrasion resistance of the film was tested according to GB / T 23988-2009 "Determination of Abrasion Resistance of Coatings - Falling Sand Method".

[0021] Durability: Antioxidant coatings prepared in the same mass as those in the examples and comparative examples were poured into a mold and cured to obtain an antioxidant coating film. After the film was subjected to 16 hours of high-temperature sweat vapor corrosion, 6 hours of strong acid corrosion, 12 hours of strong alkali corrosion, and 100 hours of high-intensity ultraviolet irradiation, the surface of the sample was observed to check for cracking or peeling.

[0022] Example 1 A method for preparing an antioxidant coating includes the following preparation steps: (1) Cinnamic acid, chitosan and 60wt% sulfuric acid were mixed in a mass ratio of 1:1.1:0.4 and dissolved in anhydrous ethanol at 1.5 times the mass of the mixture. The mixture was stirred at 400r / min for 5h in an oil bath at 60℃ under a nitrogen atmosphere. After cooling to room temperature, the solvent was removed by rotary evaporation to obtain the modified wall material. (2) Dissolve the modified wall material in 1 wt% acetic acid solution to prepare a 1 wt% modified wall material solution, add 0.7 times the mass of the modified wall material of BHT to obtain a wall core mixture, add 0.005 times the mass of the wall core mixture of Tween 80, stir at 12000 rpm for 10 min, homogenize at 35 MPa for 12 min, and spray dry under the conditions of inlet air temperature of 180℃ and outlet air temperature of 80℃ to obtain a novel microcapsule antioxidant. (3) Mix 1-hydroxybenzotriazole and dimethyl sulfoxide in a mass ratio of 1:4, add acrylic acid in a mass ratio of 1.3 times that of hydroxybenzotriazole, stir at 400 r / min for 15 min to obtain a mixture, add p-toluenesulfonic acid in a mass ratio of 0.05 times that of the mixture, react at 78 °C and 100 r / min for 6 h, extract, and then remove the solvent by vacuum distillation to obtain modified acrylate; (4) A prepolymer solution is prepared by mixing acrylate and its derivatives with modified acrylate at a mass ratio of 5.3:1, wherein the acrylate includes methyl methacrylate, ethyl methacrylate and acrylic acid at a mass ratio of 2:1:0.3, dissolved in 2 to 3 times the mass of methyl ethyl ketone, and 0.3 to 0.4 times the mass of benzoyl peroxide is added to the prepolymer solution. The mixture is stirred at 400 to 500 r / min for 20 to 30 min, reacted at 80 to 140 °C for 3 to 4 h, and naturally cooled to obtain modified acrylic resin. (5) Mix 40 parts of modified acrylic resin, 1 part of sodium dodecyl sulfonate, 5 parts of HEUR polyurethane thickener, 3 parts of dodecyl alcohol ester YT-12 film-forming aid, 0.5 parts of polysiloxane, 1 part of novel microcapsule antioxidant, 10 parts of silica and 30 parts of deionized water by weight, stir, filter and degas to obtain antioxidant coating.

[0023] Example 2 A method for preparing an antioxidant coating includes the following preparation steps: (1) Cinnamic acid, sodium alginate and 60wt% sulfuric acid were mixed in a mass ratio of 1:1.1:0.4 and dissolved in anhydrous ethanol at 1.5 times the mass of the mixture. The mixture was stirred at 400r / min for 5h in an oil bath at 65℃ under a nitrogen atmosphere. After cooling to room temperature, the solvent was removed by rotary evaporation to obtain the modified wall material. (2) Dissolve the modified wall material in 1 wt% acetic acid solution to prepare a 1 wt% modified wall material solution, add 0.6 times the mass of the modified wall material of BHT to obtain a wall core mixture, add 0.0045 times the mass of the wall core mixture of Tween 80, stir at 12000 rpm for 10 min, homogenize at 35 MPa for 10 min, and spray dry under the conditions of inlet air temperature of 180℃ and outlet air temperature of 80℃ to obtain a novel microcapsule antioxidant. (3) Mix 1-hydroxybenzotriazole and dimethyl sulfoxide in a mass ratio of 1:3~5, add acrylic acid with a mass of 1.5 times that of hydroxybenzotriazole, stir at 400 r / min for 10~15 min to obtain a mixture, add p-toluenesulfonic acid with a mass of 0.05 times that of the mixture, react at 79℃ and 150 r / min for 8 h, extract, and then remove the solvent by vacuum distillation to obtain modified acrylate; (4) Acrylates and their derivatives are mixed with modified acrylates at a mass ratio of 5.3:1 to obtain a prepolymer solution, wherein the acrylates include methyl methacrylate, ethyl methacrylate and acrylic acid at a mass ratio of 2:1:0.3, dissolved in 2 times the mass of the prepolymer solution in butanone, and 0.3 times the mass of the prepolymer solution in benzoyl peroxide is added. The mixture is stirred at 500 r / min for 20 min, reacted at 90 °C for 4 h, and naturally cooled to obtain modified acrylic resin. (5) Mix 50 parts of modified acrylic resin, 1 part of sodium dodecyl sulfonate, 5 parts of HEUR polyurethane thickener, 3 parts of dodecyl alcohol ester YT-12 film-forming aid, 0.5 parts of polysiloxane, 1 part of novel microcapsule antioxidant, 10 parts of silica and 30 parts of deionized water by weight, stir, filter and degas to obtain antioxidant coating.

[0024] Example 3 A method for preparing an antioxidant coating includes the following preparation steps: (1) Mix benzoic acid, chitosan and 60wt% sulfuric acid in a mass ratio of 1:1.1:0.4, dissolve in 1.5 times the mass of the mixture in anhydrous ethanol, stir at 400r / min for 6h in an oil bath at 60℃ under a nitrogen atmosphere, cool to room temperature, and then remove the solvent by rotary evaporation to obtain the modified wall material. (2) Dissolve the modified wall material in 1wt% acetic acid solution to prepare a 1wt% modified wall material solution, add 0.7 times the mass of the modified wall material of BHT to obtain a wall core mixture, add 0.0060 times the mass of the wall core mixture of Tween 80, stir at 13000rpm for 15min, homogenize at 35MPa for 15min, and spray dry under the conditions of inlet air temperature of 180℃ and outlet air temperature of 85℃ to obtain a novel microcapsule antioxidant. (3) Mix 1-hydroxybenzotriazole and dimethyl sulfoxide in a mass ratio of 1:4, add acrylic acid with a mass of 1.3 times that of hydroxybenzotriazole, stir at 400 r / min for 15 min to obtain a mixture, add p-toluenesulfonic acid with a mass of 0.05 times that of the mixture, react at 79 °C and 150 r / min for 6 h, extract, and then remove the solvent by vacuum distillation to obtain modified acrylate; (4) Acrylates and their derivatives are mixed with modified acrylates at a mass ratio of 7.6:1 to obtain a prepolymer solution, wherein the acrylates include methyl methacrylate, ethyl methacrylate and acrylic acid at a mass ratio of 5:2:0.6, dissolved in 2 times the mass of the prepolymer solution in butanone, and 0.3 times the mass of the prepolymer solution in benzoyl peroxide is added. The mixture is stirred at 400 r / min for 25 min, reacted at 110 °C for 3 h, and naturally cooled to obtain modified acrylic resin. (5) Mix by weight: 50 parts modified acrylic resin, 2 parts sodium dodecyl sulfonate, 7 parts HEUR polyurethane thickener, 4 parts dodecyl alcohol ester YT-12 film-forming aid, 0.6 parts polysiloxane, 2 parts novel microcapsule antioxidant, 13 parts silica, and 35 parts deionized water. Stir, filter, and degas to obtain an antioxidant coating.

[0025] Example 4 A method for preparing an antioxidant coating includes the following preparation steps: (1) Mix benzoic acid, gelatin and 60wt% sulfuric acid in a mass ratio of 1:1.1:0.4, dissolve in 1.5 times the mass of the mixture in anhydrous ethanol, stir at 450r / min for 6h in an oil bath at 60℃ under a nitrogen atmosphere, cool to room temperature, and then remove the solvent by rotary evaporation to obtain the modified wall material. (2) Dissolve the modified wall material in 1 wt% acetic acid solution to prepare a 1 wt% modified wall material solution, add 0.7 times the mass of the modified wall material of BHT to obtain a wall core mixture, add 0.0055 times the mass of the wall core mixture of Tween 80, stir at 13000 rpm for 12 min, homogenize at 35 MPa for 13 min, and spray dry under the conditions of inlet air temperature of 180℃ and outlet air temperature of 85℃ to obtain a novel microcapsule antioxidant. (3) Mix 1-hydroxybenzotriazole and dimethyl sulfoxide at a mass ratio of 1:45, add acrylic acid at a mass ratio of 1.3 times that of hydroxybenzotriazole, stir at 350 r / min for 13 min to obtain a mixture, add p-toluenesulfonic acid at a mass ratio of 0.07 times that of the mixture, react at 79 °C and 130 r / min for 7 h, extract, and then remove the solvent by vacuum distillation to obtain modified acrylate; (4) Acrylates and their derivatives are mixed with modified acrylates at a mass ratio of 6.5:1 to obtain a prepolymer solution, wherein the acrylates include methyl methacrylate, ethyl methacrylate and acrylic acid at a mass ratio of 4:1.1:0.4, dissolved in 2 times the mass of the prepolymer solution in butanone, and 0.3 times the mass of the prepolymer solution in benzoyl peroxide is added. The mixture is stirred at 450 r / min for 25 min, reacted at 100 °C for 3 h, and naturally cooled to obtain modified acrylic resin. (5) Mix by weight: 50 parts modified acrylic resin, 2 parts sodium dodecyl sulfonate, 7 parts HEUR polyurethane thickener, 4 parts dodecyl alcohol ester YT-12 film-forming aid, 0.6 parts polysiloxane, 2 parts novel microcapsule antioxidant, 13 parts silica, and 35 parts deionized water. Stir, filter, and degas to obtain an antioxidant coating.

[0026] Example 5 A method for preparing an antioxidant coating includes the following preparation steps: (1) Naphthoic acid, chitosan and 60wt% sulfuric acid are mixed in a mass ratio of 1:1.1:0.4 and dissolved in 1.5 times the mass of the mixture in anhydrous ethanol. The mixture is stirred at 400r / min for 6h in an oil bath at 60℃ under a nitrogen atmosphere. After cooling to room temperature, the solvent is removed by rotary evaporation to obtain the modified wall material. (2) Dissolve the modified wall material in 1 wt% acetic acid solution to prepare a 1 wt% modified wall material solution, add 0.7 times the mass of the modified wall material of BHT to obtain a wall core mixture, add 0.0045 times the mass of the wall core mixture of Tween 80, stir at 12000 rpm for 13 min, homogenize at 35 MPa for 13 min, and spray dry under the conditions of inlet air temperature of 180℃ and outlet air temperature of 80℃ to obtain a novel microcapsule antioxidant. (3) Mix 1-hydroxybenzotriazole and dimethyl sulfoxide in a mass ratio of 1:4, add acrylic acid with a mass of 1.3 times that of hydroxybenzotriazole, stir at 350 r / min for 13 min to obtain a mixture, add p-toluenesulfonic acid with a mass of 0.07 times that of the mixture, react at 78 °C and 130 r / min for 7 h, extract, and then remove the solvent by vacuum distillation to obtain modified acrylate; (4) Acrylates and their derivatives are mixed with modified acrylates at a mass ratio of 7.6:1 to obtain a prepolymer solution, wherein the acrylates include methyl methacrylate, ethyl methacrylate and acrylic acid at a mass ratio of 5:2:0.6, dissolved in 2 times the mass of the prepolymer solution in butanone, and 0.3 times the mass of the prepolymer solution in benzoyl peroxide is added. The mixture is stirred at 450 r / min for 25 min, reacted at 100 °C for 4 h, and naturally cooled to obtain modified acrylic resin. (5) Mix by weight: 55 parts modified acrylic resin, 2 parts sodium dodecyl sulfonate, 8 parts HEUR polyurethane thickener, 4 parts dodecyl alcohol ester YT-12 film-forming aid, 0.8 parts polysiloxane, 2 parts novel microcapsule antioxidant, 13 parts silica, and 35 parts deionized water. Stir, filter, and degas to obtain an antioxidant coating.

[0027] Comparative Example 1 The difference between Comparative Example 1 and Example 2 is that step (3) is different, and 1-hydroxybenzotriazole in step (3) is replaced with ethanol; the rest of the steps are the same as in Example 2.

[0028] Comparative Example 2 The difference between Comparative Example 2 and Example 2 is that step (3) is omitted, and the modified acrylate in step (4) is replaced with n-butyl methacrylate; the remaining steps are the same as in Example 2.

[0029] Comparative Example 3 The difference between Comparative Example 3 and Example 2 is that step (1) is omitted, and the modified wall material in step (2) is replaced with sodium alginate; the remaining steps are the same as in Example 2.

[0030] Comparative Example 4 The difference between Comparative Example 4 and Example 2 is that steps (1) and (2) are omitted, and the novel microcapsule antioxidant in step (5) is replaced with BHT; the remaining steps are the same as in Example 2.

[0031] Example of effect Table 1 below shows the performance analysis results of the antioxidant coatings of Examples 1 to 5 and Comparative Examples 1 to 4 of the present invention.

[0032] A comparison of the experimental data from Example 2 with Comparative Examples 1 and 2 reveals that the present invention uses hydroxybenzotriazole esterification to modify acrylic acid, and then uses the modified acrylic acid to prepare modified acrylic resin coatings. The benzotriazole structure has high hardness and rigidity. Introducing the benzotriazole structure into the acrylic resin through esterification makes it more wear-resistant, reduces surface wear caused by friction, and extends the service life of the coating. Furthermore, it has good UV absorption properties, converting ultraviolet light into harmless heat energy, thereby reducing the degradation effect of ultraviolet light on the acrylic resin and further improving the durability of the coating. A comparison of the experimental data from Example 2 with Comparative Examples 3 and 4 reveals that the present invention, secondly… A novel microcapsule wall material is prepared by modifying the microcapsule wall material with hydrophobic compounds and then coating it with antioxidants. The hydrophobic compound-modified microcapsule wall material can effectively prevent external moisture and oxygen from entering the microcapsule, thereby reducing the contact opportunity between the antioxidant and moisture and oxygen, reducing the possibility of its oxidation, improving the storage stability and performance of the antioxidant, and improving the stability of the coating in humid environments. Furthermore, the microcapsule coating protects the core material antioxidant from the influence of the external environment, allowing the antioxidant to be released slowly and continuously in the coating, effectively inhibiting the oxidation reaction of the coating in the long term, preventing the antioxidant from prematurely failing during storage and use, and improving the stability and durability of the coating.

[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A method for preparing an antioxidant coating, characterized in that, The preparation steps include the following: (1) Cinnamic acid, sodium alginate and 60wt% sulfuric acid were mixed in a mass ratio of 1:1.1:0.4 and dissolved in anhydrous ethanol at 1.5 times the mass of the mixture. The mixture was stirred at 400r / min for 5h in an oil bath at 65℃ under a nitrogen atmosphere. After cooling to room temperature, the solvent was removed by rotary evaporation to obtain the modified wall material. (2) Dissolve the modified wall material in 1 wt% acetic acid solution to prepare a 1 wt% modified wall material solution, add 0.6 times the mass of the modified wall material of BHT to obtain a wall core mixture, add 0.0045 times the mass of the wall core mixture of Tween 80, stir at 12000 rpm for 10 min, homogenize at 35 MPa for 10 min, and spray dry under the conditions of inlet air temperature of 180℃ and outlet air temperature of 80℃ to obtain a novel microcapsule antioxidant. (3) Mix 1-hydroxybenzotriazole and dimethyl sulfoxide in a mass ratio of 1:3~5, add acrylic acid with a mass of 1.5 times that of hydroxybenzotriazole, stir at 400 r / min for 10~15 min to obtain a mixture, add p-toluenesulfonic acid with a mass of 0.05 times that of the mixture, react at 79℃ and 150 r / min for 8 h, extract, and then remove the solvent by vacuum distillation to obtain modified acrylate; (4) Acrylates and their derivatives are mixed with modified acrylates at a mass ratio of 5.3:1 to obtain a prepolymer solution, wherein the acrylates include methyl methacrylate, ethyl methacrylate and acrylic acid at a mass ratio of 2:1:0.3, dissolved in 2 times the mass of the prepolymer solution in butanone, and 0.3 times the mass of the prepolymer solution in benzoyl peroxide is added. The mixture is stirred at 500 r / min for 20 min, reacted at 90 °C for 4 h, and naturally cooled to obtain modified acrylic resin. (5) Mix 50 parts of modified acrylic resin, 1 part of sodium dodecyl sulfonate, 5 parts of HEUR polyurethane thickener, 3 parts of dodecyl alcohol ester YT-12 film-forming aid, 0.5 parts of polysiloxane, 1 part of novel microcapsule antioxidant, 10 parts of silica and 30 parts of deionized water by weight, stir, filter and degas to obtain antioxidant coating.

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