An antibacterial coating and a method for preparing the same

Abstract

The application discloses an antibacterial coating, which comprises A component and B component, wherein the A component comprises the following raw materials in parts by weight: 40-60 parts of epoxy resin, 15-35 parts of polyamide resin, 5-10 parts of tea tree oil, 1-3 parts of di(2-ethylhexyl) phthalate, 1-2 parts of fumed silica, 1-2 parts of acrylate, 1-2 parts of sodium phosphate and 1-2 parts of polyvinyl ether; the B component comprises the following raw materials in parts by weight: 20-30 parts of modified nano zinc oxide, 40-60 parts of antibacterial curing agent, 15-20 parts of butanol and 2-10 parts of acetone; and the weight ratio of the A component to the B component is 8:2-4. The application has excellent mechanical properties, strong adhesion and good water resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of paint, in particular to an antibacterial paint and a preparation method thereof.

[0002] Paint is a viscous liquid prepared by resin, or oil, or emulsion as the main component, adding or not adding pigments, fillers, and corresponding additives, and using organic solvents or water as the solvent, which is coated on the surface of the object to be protected or decorated, and can form a continuous film firmly attached to the object to be painted. The paint with antibacterial effect is called antibacterial paint. With the continuous improvement of people's living standards, people's demand for living hygiene quality is also getting higher and higher. How to effectively resist bacteria and sterilize is a challenge to modern life. The antibacterial paint industry is still in the development stage. Solving the application process of antibacterial materials in paint is a common task for the paint industry.

[0003] The antibacterial paint is divided into two parts: one part is a bactericide for killing bacteria, and the other part is a carrier. The common antibacterial agents mainly include organic antibacterial agents, nano-silver and inorganic metal oxides. Among them, zinc oxide is widely used in antibacterial paint due to its low cost and excellent bactericidal performance. The carrier is usually some high molecular polymers such as polyurethane, epoxy resin, acrylic resin or alkyd resin. Epoxy resin has excellent properties such as strong adhesion and high hardness, and is widely used in antibacterial paint. The antibacterial agent forms a paint with the help of the carrier for construction. The two parts are indispensable and interdependent, and are a whole. However, when the antibacterial agent is inorganic metal oxide or nano-silver, it cannot be compounded with high molecular inorganic matter alone and needs the help of a coupling agent.

[0004] The patent with application number 201710416153.8 discloses a preparation method of modified nano-zinc oxide. The zinc oxide is modified by using 3-aminopropyl triethoxysilane coupling agent, which is applied to the paint to enhance the hardness and adsorption force of the paint film. However, the coupling agent has an amino hydrophilic group, which affects the water resistance of the paint. SUMMARY

[0005] In order to solve the above technical problems, the present application provides an antibacterial paint and a preparation method thereof.

[0006] The object of the present application can be achieved by the following technical solutions.

[0007] An antibacterial paint comprises A component and B component.

[0008] The A component comprises the following raw materials by weight: 40-60 parts of epoxy resin, 15-35 parts of polyamide resin, 5-10 parts of tea tree oil, 1-3 parts of di(2-ethylhexyl) phthalate, 1-2 parts of fumed silica, 1-2 parts of acrylate, 1-2 parts of sodium phosphate, 1-2 parts of polyvinyl ether;

[0009] The B component comprises the following raw materials by weight: 20-30 parts of modified nano zinc oxide, 40-60 parts of antibacterial curing agent, 15-20 parts of butanol, 2-10 parts of acetone;

[0010] The antibacterial coating is prepared by the following steps:

[0011] Step S1: The epoxy resin and polyamide resin are added to the material barrel, and the fumed silica, acrylate, sodium phosphate and polyvinyl ether are added under stirring at a speed of 800 r / min. After the system is uniformly mixed, it is dispersed at a speed of 2000 r / min for 20 min, ground by a sand mill for 10 min, filtered through a 200-mesh screen, and then the tea tree oil and di(2-ethylhexyl) phthalate are mixed uniformly under stirring at a speed of 500 r / min for 2 h to obtain the A component;

[0012] Step S2: The butanol and acetone are mixed to prepare a mixed solution, and then the modified nano zinc oxide and the antibacterial curing agent are added to the mixed solution and stirred at a speed of 500 r / min for 2 h to obtain the B component.

[0013] Further, the modified nano zinc oxide is prepared by the following steps:

[0014] According to weight parts, 10-15 parts of nano zinc oxide are put into 90-110 parts of deionized water, ultrasonic dispersion for 30 min, 2-3 parts of polyfluoro amino-containing siloxane is added, heated to 50-60℃ and stirred for 2 h, filtered, then washed with 10 parts of anhydrous ethanol, and then dried at 30-40℃ for 3 h to obtain the modified nano zinc oxide;

[0015] The molecular structure of the silane coupling agent is generally: Y-R-Si(OR)3, wherein Y represents an organic functional group end, Si-OR represents a silane oxy group end, the silane oxy group end has reactivity to inorganic substances, and the organic functional group end has reactivity or compatibility to organic substances; after the hydrolysis of the polyfluoro amino-containing siloxane end silanol group, the bonding reaction occurs with the nano zinc oxide, the amino group at the organic functional group end cooperates with the complex of the antibacterial type curing agent, the epoxy resin and the polyamide resin to synergistically cure, and the reaction occurs, so that the nano zinc oxide and the high molecular epoxy resin and polyamide complex are more stable through the polyfluoro amino-containing siloxane coupling agent link; the polyfluoro amino-containing siloxane coupling agent introduces fluorine element on the basis of amino siloxane, reduces the surface energy, and enhances the hydrophobic property.

[0016] Further, the polyfluoro amino-containing siloxane is prepared by the following steps:

[0017] A1: 1,1,2,2-perfluorooctyltrimethoxysilane is mixed with sodium hydroxide and heated to 60-70°C, then glycidol is slowly added dropwise, and after the dropwise addition is completed, the reaction is continued for 4h to obtain intermediate a, the mass ratio of 1,1,2,2-perfluorooctyltrimethoxysilane, sodium hydroxide and glycidol being 468:40-60:74-148;

[0018] During the reaction, glycidol and 1,1,2,2-perfluorooctyltrimethoxysilane react in a one-to-one ratio by molecular weight, the hydroxyl group in glycidol and a C-F bond in 1,1,2,2-perfluorooctyltrimethoxysilane condense to form an ether bond, and an epoxy group is introduced;

[0019] A2: Intermediate a is dissolved in acetonitrile with imidazole, stirred in a water bath at 45-55°C for 2h, rotary evaporated to remove the solvent, then washed with acetonitrile, and then vacuum dried at 30-40°C for 5h to obtain a polyfluorinated amino-containing siloxane, the weight ratio of intermediate a, imidazole and acetonitrile being 522:68-136:700-800;

[0020] During the reaction, intermediate a reacts with imidazole, the epoxy group in intermediate a undergoes nucleophilic addition reaction with the amino group in imidazole, the epoxy group breaks and polymerizes with the amino group in imidazole to ultimately obtain the product.

[0021] Further, the antibacterial curing agent is prepared by the following steps;

[0022] B1: 10-20 parts by weight of chitosan is added to 40-60 parts by weight of a 10% acetic acid solution to dissolve, the obtained mixture is heated to 50-70°C, and is subjected to ultrasonic degradation for 25-35h, a 5% sodium hydroxide solution is added dropwise to adjust the pH to 8-10 while stirring, after the solid precipitates, it is filtered to obtain low molecular chitosan;

[0023] B2: 5 parts by weight of low molecular chitosan and 1-2 parts by weight of arginine are added to 20 parts of distilled water and stirred, a 5% hydrochloric acid solution is used to adjust the pH to 3-5, then 0.1-0.2 parts of 1-hydroxybenzotriazole and 0.1-0.2 parts of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride are added and reacted at 30°C for 12h, after the reaction is completed, a 5% sodium hydroxide solution is added dropwise to adjust the pH to 8-10 while stirring, and after the solid precipitates, it is filtered to obtain intermediate b;

[0024] During the reaction, the amino group in the low molecular chitosan is acylated with the carboxyl group in the arginine in the presence of 1-hydroxybenzotriazole and 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride to form intermediate b;

[0025]

[0026] B3: 2-3 parts of tea polyphenols and 5-6 parts of formaldehyde are mixed, nitrogen is introduced, the temperature is raised to 70-80 DEG C, stirring is carried out at a speed of 300-500 r / min, constant temperature reaction is carried out for 3 h, then intermediate b is added, the temperature is raised to 110-120 DEG C, intermediate b is liquefied, and constant temperature is maintained for 2 h, heating and stirring are stopped, and the temperature is cooled to room temperature to discharge, then vacuum distillation is carried out at 110-120 DEG C for 2 h, the distillation pressure is 0.10-0.20 kPa, water is removed, and after cooling, an antibacterial type curing agent is obtained;

[0027] In the reaction process, the phenolic hydroxyl group in the tea polyphenols and formaldehyde are subjected to aldol condensation reaction under the condition of 70-80 DEG C to generate benzaldehyde, and the benzaldehyde is subjected to ketimine reaction with the amino group in intermediate b under the condition of 110-120 DEG C to generate an imine group, so that the antibacterial type curing agent is obtained.

[0028] The beneficial effects of the present application are as follows:

[0029] The antibacterial coating of the present application adopts an epoxy resin and polyamide resin complex as a base body, which is cured by an antibacterial type curing agent and a multi-fluorine amino-containing coupling agent, tea tree oil and nano zinc oxide as antibacterial substances, sodium phosphate as a dispersant, di(2-ethylhexyl) phthalate as a plasticizer, fumed silica as an anti-settling agent, acrylate as a leveling agent, and polyvinyl ether as a defoaming agent;

[0030] The organic functional group end of the multi-fluorine amino-containing siloxane coupling agent not only has an amino group and an antibacterial type curing agent to synergistically cure the complex of the epoxy resin and the polyamide resin, to form a network stereopolymer to enhance the adhesion of the coating, but also introduces fluorine elements to reduce the surface energy of the coupling agent and enhance the hydrophobicity of the coating; the antibacterial type curing agent takes low-molecular chitosan as a main body, forms chitosan derivatives through a series of reactions, can be used as a curing agent to cure the complex of the epoxy resin and the polyamide resin, and introduces guanidine groups and phenolic hydroxyl groups, which can change cell activity to inhibit bacteria. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application. Embodiment 1

[0032] A modified nano zinc oxide is prepared by the following steps.

[0033] Put 10 parts of nano zinc oxide into 90 parts of deionized water by weight, ultrasonic dispersion for 30 min, add 2 parts of polyfluoro amino-containing silicone, heat to 50℃ and stir for 2h, filter, then wash with 10 parts of anhydrous ethanol, and then dry at 30℃ for 3h to obtain modified nano zinc oxide;

[0034] The polyfluoro amino-containing silicone is prepared by the following steps:

[0035] Mix 1,1,2,2-perfluorooctyltrimethoxysilane and sodium hydroxide uniformly, heat to 60℃, then slowly add glycidol dropwise, continue to react for 4h after the addition is completed to obtain intermediate a, and the mass ratio of 1,1,2,2-perfluorooctyltrimethoxysilane, sodium hydroxide and glycidol is 468:40:74;

[0036] Dissolve intermediate a and imidazole in acetonitrile, stir in a 45℃ water bath for 2h, remove the solvent by rotary evaporation, then wash with acetonitrile, and then vacuum dry at 30℃ for 5h to obtain polyfluoro amino-containing silicone, and the weight ratio of intermediate a, imidazole and acetonitrile is 522:68:700. Example 2

[0037] A modified nano zinc oxide is prepared by the following steps:

[0038] Put 13 parts of nano zinc oxide into 100 parts of deionized water by weight, ultrasonic dispersion for 30 min, add 2.5 parts of polyfluoro amino-containing silicone, heat to 50℃ and stir for 2h, filter, then wash with 10 parts of anhydrous ethanol, and then dry at 30℃ for 3h to obtain modified nano zinc oxide;

[0039] The polyfluoro amino-containing silicone is prepared by the following steps:

[0040] Mix 1,1,2,2-perfluorooctyltrimethoxysilane and sodium hydroxide uniformly, heat to 65℃, then slowly add glycidol dropwise, continue to react for 4h after the addition is completed to obtain intermediate a, and the mass ratio of 1,1,2,2-perfluorooctyltrimethoxysilane, sodium hydroxide and glycidol is 468:60:111;

[0041] Dissolve intermediate a and imidazole in acetonitrile, stir in a 50℃ water bath for 2h, remove the solvent by rotary evaporation, then wash with acetonitrile, and then vacuum dry at 30℃ for 5h to obtain polyfluoro amino-containing silicone, and the weight ratio of intermediate a, imidazole and acetonitrile is 522:102:750. Example 3

[0042] A modified nano zinc oxide is prepared by the following steps:

[0043] Put 15 parts of nano zinc oxide into 110 parts of deionized water by weight, ultrasonic dispersion for 30 min, add 3 parts of polyfluoro amino-containing silicone, heat to 60℃ and stir for 2h, filter, then wash with 10 parts of anhydrous ethanol, and then dry at 40℃ for 3h to obtain modified nano zinc oxide;

[0044] The polyfluoro amino-containing silicone is prepared by the following steps:

[0045] Mix 1,1,2,2-perfluorooctyl trimethoxysilane with sodium hydroxide uniformly, heat to 70℃, then slowly add glycidol, continue to react for 4h after the addition is completed, to obtain intermediate a, the mass ratio of 1,1,2,2-perfluorooctyl trimethoxysilane, sodium hydroxide and glycidol is 468:80:148;

[0046] Dissolve intermediate a and imidazole in acetonitrile, stir in a 55℃ water bath for 2h, remove the solvent by rotary evaporation, then wash with acetonitrile, and then vacuum dry at 40℃ for 5h to obtain polyfluoro amino-containing silicone, the weight ratio of intermediate a, imidazole and acetonitrile is 522:136:800. Example 4

[0047] An antibacterial curing agent is prepared by the following steps:

[0048] Dissolve 10 parts of chitosan in 40 parts of 10% acetic acid solution by weight, heat the mixture to 50℃, and degrade for 25h by ultrasonic wave, add 5% sodium hydroxide solution by weight to adjust the pH to 8 while stirring, filter after the solid precipitates, to obtain low molecular chitosan;

[0049] Mix 5 parts of low molecular chitosan and 1 part of arginine in 20 parts of distilled water by weight, adjust the pH to 3 with 5% hydrochloric acid solution by weight, then add 0.1 part of 1-hydroxybenzotriazole and 0.1 part of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride, and react at 30℃ for 12h, after the reaction is completed, adjust the pH to 8 by adding 5% sodium hydroxide solution by weight while stirring, and filter after the solid precipitates to obtain intermediate b;

[0050] Mix 2 parts of tea polyphenol and 5 parts of formaldehyde by weight, pass nitrogen gas, heat to 70℃, stir at a speed of 300r / min, and constant temperature reaction for 3h, then add 10 parts of intermediate b, heat to 110℃ to liquefy intermediate b, and constant temperature for 2h, stop heating and stirring, cool to room temperature, then perform vacuum distillation at 110℃ for 2h, the distillation gas pressure is 0.10kPa, remove the water, and cool to obtain the antibacterial curing agent. Example 5

[0051] An antibacterial curing agent is prepared by the following steps:

[0052] Dissolve 15 parts of chitosan in 50 parts of 10% acetic acid solution by weight, heat the mixture to 60°C, and degrade it by ultrasonic wave for 30 hours. Add 5% sodium hydroxide solution dropwise to adjust the pH to 9 while stirring, and filter the solid precipitate to obtain low-molecular chitosan.

[0053] Mix 5 parts of low-molecular chitosan and 1.5 parts of arginine in 20 parts of distilled water, adjust the pH to 4 with 5% hydrochloric acid solution, and then add 0.15 parts of 1-hydroxybenzotriazole and 0.15 parts of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride to react at 30°C for 12 hours. After the reaction, add 5% sodium hydroxide solution dropwise to adjust the pH to 9 while stirring, and filter the solid precipitate to obtain intermediate b.

[0054] Mix 2.5 parts of tea polyphenol and 5.5 parts of formaldehyde, introduce nitrogen gas, and heat to 75°C while stirring at 400 rpm. React for 3 hours, add 10 parts of intermediate b, and heat to 115°C to liquefy intermediate b and react for 2 hours. Stop heating and stirring, cool to room temperature, and discharge the product. Distill it at 115°C under reduced pressure for 2 hours at a pressure of 0.15 kPa to remove water, and cool to obtain an antibacterial solidifying agent. Example 6

[0055] An antibacterial solidifying agent is prepared by the following steps.

[0056] Dissolve 20 parts of chitosan in 60 parts of 10% acetic acid solution by weight, heat the mixture to 70°C, and degrade it by ultrasonic wave for 35 hours. Add 5% sodium hydroxide solution dropwise to adjust the pH to 10 while stirring, and filter the solid precipitate to obtain low-molecular chitosan.

[0057] Mix 5 parts of low-molecular chitosan and 2 parts of arginine in 20 parts of distilled water, adjust the pH to 5 with 5% hydrochloric acid solution, and then add 0.2 parts of 1-hydroxybenzotriazole and 0.2 parts of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride to react at 30°C for 12 hours. After the reaction, add 5% sodium hydroxide solution dropwise to adjust the pH to 10 while stirring, and filter the solid precipitate to obtain intermediate b.

[0058] By weight parts, 3 parts of tea polyphenols and 6 parts of formaldehyde are mixed, nitrogen is passed, the temperature is raised to 80°C, stirring is carried out at a speed of 500 r / min, constant temperature reaction is carried out for 3 h, then 10 parts of intermediate b are added, the temperature is raised to 120°C, intermediate b is liquefied, and constant temperature is maintained for 2 h, heating and stirring are stopped, and the mixture is cooled to room temperature and discharged, then vacuum distillation is carried out at 120°C for 2 h, the distillation pressure is 0.20 kPa, water is removed, and after cooling, an antibacterial type curing agent is obtained. Example 7

[0059] An antibacterial coating, comprising A component and B component;

[0060] The A component comprises the following raw materials by weight parts: 40 parts of epoxy resin, 15 parts of polyamide resin, 5 parts of tea tree oil, 1 part of di(2-ethylhexyl) phthalate, 1 part of fumed silica, 1 part of acrylate, 1 part of sodium phosphate and 1 part of polyvinyl ether;

[0061] The B component comprises the following raw materials by weight parts: 20 parts of modified nano zinc oxide obtained in Example 1, 40 parts of antibacterial curing agent obtained in Example 4, 15 parts of butanol and 2 parts of acetone;

[0062] An antibacterial coating is prepared by the following steps;

[0063] The epoxy resin and the polyamide resin are added to a material barrel, the fumed silica, the acrylate, the sodium phosphate and the polyvinyl ether are added under stirring at a speed of 800 r / min, after the system is uniformly mixed, dispersion is carried out at a speed of 2000 r / min for 20 min, grinding is carried out in a sand mill for 10 min, 200 mesh filtration is carried out, the tea tree oil and di(2-ethylhexyl) phthalate are added, stirring is carried out at a speed of 500 r / min for 2 h, and the A component is obtained after uniform mixing;

[0064] The butanol and the acetone are mixed to prepare a mixed solution, the modified nano zinc oxide obtained in Example 1 and the antibacterial curing agent obtained in Example 4 are added to the mixed solution, stirring is carried out at a speed of 500 r / min for 2 h, and the B component is obtained after uniform mixing;

[0065] The A component and the B component are mixed in a weight ratio of 8:2 to obtain an antibacterial coating. Example 8

[0066] An antibacterial coating, comprising A component and B component;

[0067] The A component comprises the following raw materials by weight parts: 50 parts of epoxy resin, 25 parts of polyamide resin, 8 parts of tea tree oil, 2 parts of di(2-ethylhexyl) phthalate, 1.5 parts of fumed silica, 1.5 parts of acrylate, 1.5 parts of sodium phosphate and 1.5 parts of polyvinyl ether;

[0068] The B component comprises the following raw materials by weight: 25 parts of the modified nano zinc oxide obtained in Example 2, 50 parts of the antibacterial curing agent obtained in Example 5, 18 parts of butanol and 7 parts of acetone;

[0069] An antibacterial coating is prepared by the following steps:

[0070] The epoxy resin and the polyamide resin are added into a material barrel, and the fumed silica, the acrylate, the sodium phosphate and the polyvinyl ether are added under stirring at a speed of 800 r / min. After the system is uniformly mixed, dispersion is carried out at a speed of 2000 r / min for 20 min, and then grinding is carried out by a sand mill for 10 min, and then 200-mesh filtration is carried out. The tea tree oil and the di(2-ethylhexyl) phthalate are added and stirred at a speed of 500 r / min for 2 h to obtain the A component.

[0071] Butanol and acetone are mixed to prepare a mixed solution, and then the modified nano zinc oxide obtained in Example 2 and the antibacterial curing agent obtained in Example 5 are added into the mixed solution, and stirring is carried out at a speed of 500 r / min for 2 h to obtain the B component.

[0072] The A component and the B component are mixed in a weight ratio of 8:3 to obtain the antibacterial coating. Example 9

[0073] An antibacterial coating comprises an A component and a B component.

[0074] The A component comprises the following raw materials by weight: 60 parts of an epoxy resin, 35 parts of a polyamide resin, 10 parts of tea tree oil, 3 parts of di(2-ethylhexyl) phthalate, 2 parts of fumed silica, 2 parts of acrylate, 2 parts of sodium phosphate and 2 parts of polyvinyl ether.

[0075] The B component comprises the following raw materials by weight: 30 parts of the modified nano zinc oxide obtained in Example 3, 60 parts of the antibacterial curing agent obtained in Example 6, 20 parts of butanol and 10 parts of acetone.

[0076] An antibacterial coating is prepared by the following steps:

[0077] The epoxy resin and the polyamide resin are added into a material barrel, and the fumed silica, the acrylate, the sodium phosphate and the polyvinyl ether are added under stirring at a speed of 800 r / min. After the system is uniformly mixed, dispersion is carried out at a speed of 2000 r / min for 20 min, and then grinding is carried out by a sand mill for 10 min, and then 200-mesh filtration is carried out. The tea tree oil and the di(2-ethylhexyl) phthalate are added and stirred at a speed of 500 r / min for 2 h to obtain the A component.

[0078] Butanol and acetone are mixed to prepare a mixed solution, and then the modified nano zinc oxide obtained in Example 3 and the antibacterial curing agent obtained in Example 6 are added into the mixed solution, and stirring is carried out at a speed of 500 r / min for 2 h to obtain the B component.

[0079] The A component and the B component are mixed in a weight ratio of 8:4 to obtain the antibacterial coating.

[0080] The antibacterial coating prepared by the present application is further detected for effects, and the detection results are as follows.

[0081] According to the GB / T16777-2008 “Building Waterproof Coating Test Method” standard, the related performances of the antibacterial coating prepared by the present application are tested, and the antibacterial performance test adopts the JISZ2801 standard test, and the results are shown in Table 1.

[0082]

[0083] The above content is only an example and description of the concept of the present application. Those skilled in the art can make various modifications or supplements to the described specific embodiments or replace them with similar ways, as long as they do not deviate from the concept of the present application or exceed the scope defined by the present application.

Claims

1. An antibacterial coating, characterized by, The antibacterial coating comprises an A component and a B component; The A component comprises the following raw materials by weight: 40-60 parts of epoxy resin, 15-35 parts of polyamide resin, 5-10 parts of tea tree oil, 1-3 parts of di(2-ethylhexyl) phthalate, 1-2 parts of fumed silica, 1-2 parts of acrylate, 1-2 parts of sodium phosphate, and 1-2 parts of polyvinyl ether; The B component comprises the following raw materials by weight: 20-30 parts of modified nano zinc oxide, 40-60 parts of antibacterial curing agent, 15-20 parts of butanol, and 2-10 parts of acetone; The antibacterial coating is prepared by the following steps: Step S1: The epoxy resin and the polyamide resin are added to a material barrel, and the fumed silica, the acrylate, the sodium phosphate, and the polyvinyl ether are added under stirring at a speed of 800 r / min. After the system is uniformly mixed, it is dispersed at a speed of 2000 r / min for 20 min, ground in a sand mill for 10 min, filtered through a 200-mesh sieve, and then the tea tree oil and the di(2-ethylhexyl) phthalate are added and stirred at a speed of 500 r / min for 2 h to obtain the A component; Step S2: The butanol and the acetone are mixed to prepare a mixed solution, the modified nano zinc oxide and the antibacterial curing agent are added to the mixed solution, and stirring is performed at a speed of 500 r / min for 2 h to obtain the B component; The modified nano zinc oxide is prepared by the following steps: According to weight parts, 10-15 parts of nano zinc oxide are placed in 90-110 parts of deionized water, ultrasonic dispersion is performed for 30 min, 2-3 parts of a multi-fluorine amino-containing siloxane is added, stirring is performed at a temperature of 50-60℃ for 2 h, filtration is performed, 10 parts of anhydrous ethanol is used for washing, and then drying is performed at a temperature of 30-40℃ for 3 h to obtain the modified nano zinc oxide; The antibacterial curing agent is prepared by the following steps: B1: According to weight parts, 10-20 parts of chitosan are added to 40-60 parts of a 10% acetic acid solution to dissolve, the obtained mixed solution is heated to a temperature of 50-70℃, and ultrasonic degradation is performed for 25-35 h. A 5% sodium hydroxide solution is added dropwise to adjust the pH to 8-10 while continuously stirring. After the solid is precipitated, filtration is performed to obtain low-molecular chitosan; B2: According to weight parts, 5 parts of low-molecular chitosan and 1-2 parts of arginine are added to 20 parts of distilled water to stir and mix. A 5% hydrochloric acid solution is used to adjust the pH to 3-5. Then, 0.1-0.2 parts of a condensing agent and 0.1-0.2 parts of an amino coupling activation matrix are added to react at a temperature of 30℃ for 12 h. After the reaction is completed, a 5% sodium hydroxide solution is added dropwise to adjust the pH to 8-10 while continuously stirring. After the solid is precipitated, filtration is performed to obtain an intermediate b; B3: According to weight parts, 2-3 parts of tea polyphenol and 5-6 parts of formaldehyde are mixed, nitrogen is introduced, the temperature is raised to 70-80℃, stirring is performed at a speed of 300-500 r / min, constant-temperature reaction is performed for 3 h, 10 parts of the intermediate b is then added, the temperature is raised to 110-120℃ to liquefy the intermediate b, and constant-temperature reaction is performed for 2 h. After stopping heating and stirring, the mixture is cooled to room temperature to discharge. Then, vacuum distillation is performed at a temperature of 110-120℃ for 2 h, the distillation gas pressure is 0.10-0.20 kPa, water is removed, and after cooling, the antibacterial curing agent is obtained. The condensing agent is 1-hydroxybenzotriazole, and the amino coupling activation matrix is 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride.

2. The antimicrobial coating of claim 1, wherein, The weight ratio of the A component to the B component is 8:2-4.

3. The antimicrobial coating of claim 1, wherein, The polyfluorinated amino-containing siloxane is prepared by the following steps: A1: uniformly mix 1,1,2,2-perfluorooctyltrimethoxysilane and sodium hydroxide, heat to 60-70 DEG C, then slowly add glycidol dropwise, continue to react for 4 hours after the dropwise addition is completed, to obtain intermediate a, the mass ratio of 1,1,2,2-perfluorooctyltrimethoxysilane, sodium hydroxide and glycidol being 468:40-60:74-148; A2: dissolve intermediate a and imidazole in acetonitrile, stir in a 45-55 DEG C water bath for 2 hours, remove the solvent by rotary evaporation, then wash with acetonitrile, and then vacuum dry at 30-40 DEG C for 5 hours to obtain the polyfluorinated amino-containing siloxane, the weight ratio of intermediate a, imidazole and acetonitrile being 522:68-136:700-800.

4. The method of claim 1, wherein the antimicrobial coating is prepared by mixing the antimicrobial agent with the base material in a ratio of 0.1-10% by weight. The method comprises the following steps: Step S1: add epoxy resin and polyamide resin into a material barrel, add di(2-ethylhexyl) phthalate, fumed silica, acrylate, sodium phosphate and polyvinyl ether under stirring at a speed of 800 r / min, disperse at a speed of 2000 r / min for 20 min after the system is uniformly mixed, grind in a sand mill for 10 min, filter through a 200-mesh screen, add tea tree oil and deionized water, and stir at a speed of 500 r / min for 2 h to uniformly mix, to obtain the A component; Step S2: mix butanol and acetone to prepare a mixed solution, add modified nano zinc oxide and antibacterial curing agent into the mixed solution, and stir at a speed of 500 r / min for 2 h to uniformly mix the materials, to obtain the B component.

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