High-performance polyurethane paint and preparation method thereof

Abstract

The invention discloses a high-performance polyurethane paint and a preparation method thereof, and particularly relates to the technical field of coatings. The high-performance polyurethane paint is prepared from the following components in parts by weight: 45 to 60 parts of functional polyurethane prepolymer, 4 to 7 parts of modified kaolin, 1 to 3 parts of propylene glycol methyl ether acetate, 0.1 to 0.5 part of defoaming agent, 0.2 to 0.6 part of flatting agent, 10 to 15 parts of titanium dioxide and 0.5 to 1 part of dispersing agent, the preparation method of the functional polyurethane prepolymer comprises the following steps: mixing polytetrahydrofuran glycol, diisocyanate and dibutyltin dilaurate to carry out a first reaction, and then adding a functional diol monomer to carry out a second reaction, thereby obtaining the functional polyurethane prepolymer. The coating is mildew-proof and antibacterial, and has good waterproof self-cleaning performance, mechanical property and storage stability.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a high-performance polyurethane paint and a preparation method thereof. Background Art

[0002] Paint is a chemical mixture coating that can be firmly covered on the surface of an object for protection, decoration, marking and other special purposes. Traditional oil-based paint, with drying oil as the main film-forming substance, can provide certain decoration and protection, but it will release a large amount of formaldehyde and other volatile organic compounds (VOC) during its manufacturing, construction and curing. With the enhancement of health awareness and environmental protection concepts, people's requirements for the performance of paint are increasing. Polyurethane paint does not contain benzene organic solvents, is green and environmentally friendly, and can be applied by spraying, brushing, dipping and other construction methods, which is easy to realize automatic coating. The paint has good film formation, high gloss, low VOC content and low odor, and is increasingly recognized by consumers.

[0003] At present, the research on polyurethane paints is mainly focused on improving the flame retardancy, wear resistance and corrosion resistance of paints, but key functions such as waterproofing, self-cleaning and antibacterial and mildew resistance are often overlooked.

[0004] Based on this, it is necessary to improve the formula of polyurethane paint and develop coatings that can effectively inhibit mold growth and are waterproof and self-cleaning to meet the market's urgent demand for such high-performance products. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, one of the purposes of the present invention is to provide a high-performance polyurethane paint. The paint coating can effectively inhibit the growth of bacteria and molds, and has good waterproof and self-cleaning properties, which can fully meet market demand.

[0006] The second purpose of the present invention is to provide a method for preparing high-performance polyurethane paint, which has a simple and feasible process and provides new technical support for the preparation of high-performance polyurethane paint.

[0007] One of the purposes of the present invention is achieved by the following technical solution: A high-performance polyurethane paint, comprising the following raw materials by weight: 45-60 parts of functional polyurethane prepolymer, 4-7 parts of modified kaolin, 1-3 parts of propylene glycol methyl ether acetate, 0.1-0.5 parts of defoaming agent, 0.2-0.6 parts of leveling agent, 10-15 parts of titanium dioxide, and 0.5-1 parts of dispersant; The preparation steps of the functional polyurethane prepolymer are as follows: (1) Preparation of functionalized diol monomers; (2) Polytetramethylene glycol, diisocyanate and dibutyltin dilaurate are mixed for a first reaction, and then a functionalized diol monomer is added for a second reaction to obtain a functional polyurethane prepolymer.

[0008] Furthermore, in step (2), the molar ratio of the polytetrahydrofuran diol, diisocyanate and functionalized diol monomer is 1:(2.5-4):(0.3-0.8); and the amount of dibutyltin dilaurate is 0.05-0.2% of the total weight of the polytetrahydrofuran diol and diisocyanate.

[0009] Furthermore, the diisocyanate is one of isophorone diisocyanate, toluene diisocyanate and hexamethylene diisocyanate.

[0010] Furthermore, in step (2), the temperature of the first reaction is 75-85°C, and the time is 1-3 hours; the temperature of the second reaction is 75-85°C, and the time is 2-4 hours.

[0011] Furthermore, the preparation steps of the functionalized diol monomer in step (1) are as follows: a. In an inert gas atmosphere, CO is introduced into a mixed solution of ethylene glycol diglycidyl ether and tetraethylammonium bromide. 2 to a certain pressure, heating for reaction, and after the reaction is completed, collecting the crude product, washing and drying it to obtain an intermediate product; b. The intermediate product and 7-amino[1,2,4]triazolo[1,5-A]pyrimidine-6-carboxylic acid are added to a solvent for heating reaction, and the reactant is precipitated and washed with glacial ether, and then dried to obtain a functionalized diol monomer.

[0012] Furthermore, in step a, the mass ratio of ethylene glycol diglycidyl ether to tetraethylammonium bromide is 1:0.01-0.015; the pressure is 4-5 MPa; the temperature of the heating reaction is 110-130° C., and the time is 22-26 hours.

[0013] Furthermore, in step b, the mass ratio of the intermediate product to 7-amino[1,2,4]triazolo[1,5-A]pyrimidine-6-carboxylic acid is 1:0.6-1.5, and the heating reaction temperature is 60-80°C and the time is 18-24h.

[0014] Furthermore, the preparation steps of the modified kaolin are as follows: Vinyl (trifluoromethyl) dimethyl silane, sodium dodecyl sulfate and emulsifier were added to the dopamine hydrochloride solution for emulsification, and then CuSO 4 . 5H 2 O, H2 O 2 and kaolin for soaking treatment, collecting the product, washing and drying it to obtain the product.

[0015] The principle of preparing modified kaolin in the present invention is: CuSO 4 / H 2 O 2 As an initiator, it first initiates the copolymerization of dopamine to form polydopamine; polydopamine can also serve as an initiator to induce the polymerization of vinyl (trifluoromethyl) dimethyl silane and deposit it on kaolin.

[0016] Furthermore, the dopamine hydrochloride, vinyl (trifluoromethyl) dimethyl silane, sodium dodecyl sulfate, emulsifier, CuSO 4 . 5H 2 O, H 2 O 2 The mass ratio of kaolin is 1:(8.3-8.5):(3.25-3.4):(6.5-7.5):(0.4-0.45):(1.1-1.46):(1.5-2.5).

[0017] Furthermore, the immersion treatment is carried out at a temperature of 70-80°C and for a time of 2-3 hours.

[0018] Furthermore, the defoaming agent is one of BYK-066N, BYK-055, and BYK-057; the leveling agent is BYK-300; the dispersant is BYK-110 or BYK-103; and the titanium dioxide is titanium dioxide 577.

[0019] The second object of the present invention is achieved by adopting the following technical solution: The preparation method of the high-performance polyurethane paint comprises the following steps: according to the weight ratio, functional polyurethane prepolymer, modified kaolin, defoamer, propylene glycol methyl ether acetate, dispersant, titanium dioxide and leveling agent are mixed and stirred uniformly to obtain high-performance polyurethane paint.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a high-performance polyurethane paint, which not only has excellent antibacterial and mildew-proof properties, but also has excellent waterproof and self-cleaning properties.

[0021] 2. The raw materials of the high-performance polyurethane paint of the present invention include functional polyurethane prepolymers. Functionalized diol monomers are introduced when preparing the functional polyurethane prepolymers to give the paint antibacterial and mildew-proof properties and stability. Specifically, the functionalized diol monomer is prepared using 7-amino[1,2,4]triazolo[1,5-A]pyrimidine-6-carboxylic acid and ethylene glycol diglycidyl ether. It cleverly combines the triazolopyrimidine structure and carboxylic acid group with antibacterial activity. After the polyurethane chain segment is introduced through copolymerization, the antibacterial and mildew-proof properties of the paint can be significantly improved. At the same time, the introduction of the carboxylic acid group also significantly improves the storage stability of the polyurethane paint.

[0022] 3. The raw materials of the high-performance polyurethane paint of the present invention also add modified kaolin, and the introduction of modified kaolin not only enhances the waterproof and self-cleaning properties of the paint, but also enhances the stability and antibacterial properties of the paint. Specifically, the present invention uses CuSO 4 / H 2 O 2 The polydopamine / polyvinyl (trifluoromethyl) dimethyl silane was co-deposited on the kaolin surface for modification. On the one hand, trifluoromethyl (-CF 3 ), thereby enhancing the waterproof and self-cleaning properties of the coating; on the other hand, the formed polydopamine contains copper ions and catechol groups, forming a metal-phenol network, which not only improves the dispersibility of kaolin, but also further enhances the stability and antibacterial properties of the coating.

[0023] 4. The present invention also provides a method for preparing the above-mentioned high-performance polyurethane paint, which has a simple and feasible process and provides new technical support for the preparation of high-performance polyurethane paint. DETAILED DESCRIPTION

[0024] The following will be combined with the specific embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The defoamer, leveling agent, dispersant and titanium dioxide of the present invention are obtained from conventional commercial channels. The defoamer of the present invention is one of BYK-066N, BYK-055 and BYK-057; the leveling agent is BYK-300; the dispersant is BYK-110 or BYK-103; and the titanium dioxide is titanium dioxide 577.

[0026] Example 1 A high-performance polyurethane paint, comprising the following components by weight: 55 parts of functional polyurethane prepolymer, 5 parts of modified kaolin, 2 parts of propylene glycol methyl ether acetate, 0.3 parts of BYK-066N, 0.4 parts of BYK-300, 0.75 parts of BYK-110, and 12 parts of titanium dioxide 577; The preparation steps of the functional polyurethane prepolymer are as follows: (1) Preparation of functionalized diol monomers: a. Weigh ethylene glycol diglycidyl ether and tetraethylammonium bromide in a mass ratio of 1:0.012, then dissolve ethylene glycol diglycidyl ether and tetraethylammonium bromide in dichloromethane and add them to a high-pressure reactor, wherein the concentration of ethylene glycol diglycidyl ether in dichloromethane is controlled to be 0.25 mg / mL; then, introduce CO into the reactor under nitrogen protection. 2 The pressure in the reactor reached 4.0 MPa, and the reactants were stirred at 120 °C for 24 h. The reactor was then cooled to room temperature to release the remaining CO. 2 The pressure was reduced to normal pressure, and the obtained crude product was washed with dichloromethane and dried in a vacuum oven at 30°C for 24 h to obtain an intermediate product; b. The intermediate product and 7-amino[1,2,4]triazolo[1,5-A]pyrimidine-6-carboxylic acid were weighed in a mass ratio of 1:1.1, and the intermediate product and 7-amino[1,2,4]triazolo[1,5-A]pyrimidine-6-carboxylic acid were added to dimethyl sulfoxide, wherein the concentration of the intermediate product in dimethyl sulfoxide was 0.05 g / mL; under a nitrogen atmosphere, the reaction was carried out at 70°C for 20 h, and the reactant was precipitated with icy ether and washed 3 times, and dried in a vacuum oven at 40°C for 48 h to obtain a functionalized diol monomer. 1 H NMR (C 22 H 24 N 10 O 12 , 400 MHz, d 6 -DMSO) δ 3.44-3.48 (m, 2H), 3.54 (s, 4H), 3.60-3.73 (m,6H), 3.94 (s, 2H), 4.85-4.89 (m, 2H), 7.80 (s, 2H), 8.62 (s, 2H), 10.47 (s,2H), 11.95 (s, 2H);MS (ESI) m / z = 620.16 [M], found 620.15.

[0027] (2) Polytetrahydrofuran diol, isophorone diisocyanate and functional diol monomer were weighed in a molar ratio of 1:3:0.5; then polytetrahydrofuran diol, isophorone diisocyanate and dibutyltin dilaurate were mixed, wherein the amount of dibutyltin dilaurate was 0.1% of the total weight of polytetrahydrofuran diol and isophorone diisocyanate, and the mixture was stirred at N 2 The mixture was reacted at 80°C for 2 h under an atmosphere, and then a functionalized diol monomer was added and reacted for 3 h to obtain a functional polyurethane prepolymer.

[0028] The preparation method of the modified kaolin is as follows: According to dopamine hydrochloride, vinyl (trifluoromethyl) dimethyl silane, sodium dodecyl sulfate, emulsifier OP-10, CuSO 4 . 5H 2 O, H 2 O 2 The mass ratio of kaolin and kaolin was 1:8.3:3.3:7.5:0.42:1.46:2.5. The raw materials were weighed separately, and then dopamine hydrochloride was dissolved in Tris-HCl buffer (50mM, pH=8.5) to prepare dopamine hydrochloride solution (concentration of 0.004g / mL), and then vinyl (trifluoromethyl) dimethyl silane, sodium dodecyl sulfate and emulsifier OP-10 were added for emulsification, and then CuSO 4 . 5H 2 O, H 2 O 2 and kaolin, soaked at 75°C for 2.5h, then washed with deionized water, and dried at 60°C for 3.5h to obtain modified kaolin.

[0029] This embodiment also provides a method for preparing the above-mentioned high-performance polyurethane paint, which specifically comprises the following steps: According to the weight proportions, the functional polyurethane prepolymer, modified kaolin, propylene glycol methyl ether acetate, BYK-066N, BYK-300, titanium dioxide 577 and BYK-110 are mixed and stirred uniformly to obtain a high-performance polyurethane paint.

[0030] Example 2 A high-performance polyurethane paint, comprising the following components by weight: 45 parts of functional polyurethane prepolymer, 4 parts of modified kaolin, 1 part of propylene glycol methyl ether acetate, 0.1 part of BYK-055, 0.2 part of BYK-300, 0.5 part of BYK-103, and 10 parts of titanium dioxide 577; The preparation steps of the functional polyurethane prepolymer are as follows: (1) Preparation of functionalized diol monomers: a. Weigh ethylene glycol diglycidyl ether and tetraethylammonium bromide in a mass ratio of 1:0.01, then dissolve ethylene glycol diglycidyl ether and tetraethylammonium bromide in dichloromethane and add them to a high-pressure reactor, wherein the concentration of ethylene glycol diglycidyl ether in dichloromethane is controlled to be 0.25 mg / mL; then, introduce CO into the reactor under nitrogen protection. 2 The pressure in the reactor reached 4.0 MPa, the reactants were stirred at 110 °C for 26 h, and then the reactor was cooled to room temperature to release the remaining CO 2 The pressure was reduced to normal pressure, and the obtained crude product was washed with dichloromethane and dried in a vacuum oven at 30°C for 24 h to obtain an intermediate product; b. Weigh the intermediate product and 7-amino[1,2,4]triazolo[1,5-A]pyrimidine-6-carboxylic acid in a mass ratio of 1:0.6, add the intermediate product and 7-amino[1,2,4]triazolo[1,5-A]pyrimidine-6-carboxylic acid into dimethyl sulfoxide, wherein the concentration of the intermediate product in dimethyl sulfoxide is 0.05 g / mL; react at 60°C for 24 hours under a nitrogen atmosphere, precipitate the reactant with ice ether and wash it three times, and dry it in a vacuum oven at 40°C for 48 hours to obtain a functionalized diol monomer. Functionalized diol monomer 1 H NMR was consistent with Example 1.

[0031] (2) Polytetrahydrofuran diol, toluene diisocyanate and functional diol monomer were weighed in a molar ratio of 1:2.5:0.3; then polytetrahydrofuran diol, toluene diisocyanate and dibutyltin dilaurate were mixed, wherein the amount of dibutyltin dilaurate was 0.05% of the total mass of polytetrahydrofuran diol and toluene diisocyanate, and the mixture was stirred at N 2 The mixture was reacted at 75°C for 3 h under an atmosphere, and then a functionalized diol monomer was added and reacted for 4 h to obtain a functional polyurethane prepolymer.

[0032] The preparation method of the modified kaolin is as follows: According to dopamine hydrochloride, vinyl (trifluoromethyl) dimethyl silane, sodium dodecyl sulfate, emulsifier OP-10, CuSO 4 . 5H 2 O, H 2 O 2 The mass ratio of kaolin and kaolin was 1:8.5:3.25:6.5:0.4:1.375:2. The raw materials were weighed separately, and then dopamine hydrochloride was dissolved in Tris-HCl buffer (50mM, pH=8.5) to prepare dopamine hydrochloride solution (concentration of 0.004g / mL), and then vinyl (trifluoromethyl) dimethyl silane, sodium dodecyl sulfate and emulsifier OP-10 were added to fully emulsify, and then CuSO 4. 5H 2 O, H 2 O 2 and kaolin, soaked at 75°C for 3 h, then washed with deionized water, and dried at 60°C for 4 h to obtain modified kaolin.

[0033] This embodiment also provides a method for preparing the above-mentioned high-performance polyurethane paint, which is the same as that of Example 1.

[0034] Example 3 A high-performance polyurethane paint, comprising the following components by weight: 60 parts of functional polyurethane prepolymer, 7 parts of modified kaolin, 3 parts of propylene glycol methyl ether acetate, 0.5 parts of BYK-057, 0.6 parts of BYK-300, 1 part of BYK-110, and 15 parts of titanium dioxide 577; The preparation steps of the functional polyurethane prepolymer are as follows: (1) Preparation of functionalized diol monomers: a. Weigh ethylene glycol diglycidyl ether and tetraethylammonium bromide in a mass ratio of 1:0.015, then dissolve ethylene glycol diglycidyl ether and tetraethylammonium bromide in dichloromethane and add them to a high-pressure reactor, wherein the concentration of ethylene glycol diglycidyl ether in dichloromethane is controlled to be 0.25 mg / mL; then add CO to the reactor under nitrogen protection. 2 The pressure in the reactor reached 4.0 MPa, the reactants were stirred at 130 °C for 22 h, and then the reactor was cooled to room temperature to release the remaining CO 2 The pressure was reduced to normal pressure, and the obtained crude product was washed with dichloromethane and dried in a vacuum oven at 30°C for 24 h to obtain an intermediate product; b. Weigh the intermediate product and 7-amino[1,2,4]triazolo[1,5-A]pyrimidine-6-carboxylic acid in a mass ratio of 1:1.5, add the intermediate product and 7-amino[1,2,4]triazolo[1,5-A]pyrimidine-6-carboxylic acid into dimethyl sulfoxide, wherein the concentration of the intermediate product in dimethyl sulfoxide is 0.05 g / mL; react at 80°C for 18 hours under a nitrogen atmosphere, precipitate the reactant with ice ether and wash it three times, and dry it in a vacuum oven at 40°C for 48 hours to obtain a functionalized diol monomer. Functionalized diol monomer 1 H NMR was consistent with Example 1.

[0035] (2) Polytetrahydrofuran diol, hexamethylene diisocyanate and functional diol monomer were weighed in a molar ratio of 1:4:0.8; then polytetrahydrofuran diol, hexamethylene diisocyanate and dibutyltin dilaurate were mixed, wherein the amount of dibutyltin dilaurate was 0.2% of the total mass of polytetrahydrofuran diol and hexamethylene diisocyanate, and the mixture was stirred at N 2The mixture was reacted at 85°C for 1 hour under an atmosphere, and then a functionalized diol monomer was added and reacted for 2 hours to obtain a functional polyurethane prepolymer.

[0036] The preparation method of the modified kaolin is as follows: According to dopamine hydrochloride, vinyl (trifluoromethyl) dimethyl silane, sodium dodecyl sulfate, emulsifier OP-10, CuSO 4 . 5H 2 O, H 2 O 2 The mass ratio of kaolin and kaolin was 1:8.4:3.4:6.6:0.45:1.1:1.5. The raw materials were weighed separately, and then dopamine hydrochloride was dissolved in Tris-HCl buffer (50mM, pH=8.5) to prepare dopamine hydrochloride solution (concentration of 0.004g / mL), and then vinyl (trifluoromethyl) dimethyl silane, sodium dodecyl sulfate and emulsifier OP-10 were added to fully emulsify, and then CuSO 4 ·5H 2 O, H 2 O 2 and kaolin, soaked at 75°C for 3 h, then washed with deionized water, and dried at 60°C for 3 h to obtain modified kaolin.

[0037] This embodiment also provides a method for preparing the above-mentioned high-performance polyurethane paint, which is the same as that of Example 1.

[0038] Comparative Example 1 This comparative example 1 is basically the same as Example 1, except that the modified kaolin is replaced by kaolin, and the rest is the same as Example 1.

[0039] Comparative Example 2 Comparative Example 2 is basically the same as Example 1, except that in the preparation process of the modified kaolin, the step of adding vinyl (trifluoromethyl) dimethyl silane, sodium dodecyl sulfate and emulsifier OP-10 for sufficient emulsification is omitted, and the rest is consistent with Example 1.

[0040] Comparative Example 3 Comparative Example 3 is basically the same as Example 1, except that step (1) is omitted in the preparation process of the functional polyurethane prepolymer, and the addition of the functionalized diol monomer is omitted in step (2). The rest is the same as Example 1.

[0041] Test example In order to characterize the performance of the high-performance polyurethane paint coatings prepared in the above Examples 1-3 and Comparative Examples 1-3, the following tests were performed: (1) Storage stability test is evaluated according to the following standards: Store the high-performance polyurethane paint in a dark place at 25°C for 6 months and observe whether there is any agglomeration or delamination.

[0042] The coatings of each group were evenly coated on the tinplate substrate, and after curing and drying, the following tests were carried out: (2) Adhesion is tested according to the test standard of GB / T 5210-2006; (3) The antibacterial and antifungal properties were tested in accordance with the test standard of GB / T 21866-2008 “Determination of antibacterial properties and antibacterial effects of antibacterial coatings (films)”. Escherichia coli and Staphylococcus aureus were used to test the antibacterial properties. The evaluation criteria are shown in Table 1.

[0043] (4) The water contact angle was tested using a contact angle meter. During the test, the droplet size was set to 3 μL / drop.

[0044] (5) Mechanical properties were tested according to the test standard of GB / T 1040.1-2018. The tensile rate was 10 mm / min and the specimen was dumbbell-shaped.

[0045] The test results of each group are recorded in Table 2.

[0046] Table 1 Evaluation criteria for antibacterial performance Table 2 It can be clearly seen from the test data in Table 2 that the high-performance polyurethane paints prepared in Examples 1-3 of the present invention have better antibacterial and mildew-proof properties, waterproof and self-cleaning properties, mechanical properties and storage stability. The coatings prepared in Examples 1-3 have an antibacterial rate of up to 98.6% against Escherichia coli, an antibacterial rate of up to 98.2% against Staphylococcus aureus, and an antibacterial grade of up to Class I. The water contact angle can reach 158°, with a super-hydrophobic surface that can achieve self-cleaning. In addition, the functional polyurethane prepolymer in the present invention also affects the mechanical properties and storage stability of the material to a certain extent. Examples 1-3 are significantly higher than Comparative Examples 1-3. After 6 months of storage, the above-mentioned coatings still do not show precipitation and stratification.

[0047] Compared with Example 1, in Comparative Example 1, modified kaolin is replaced with kaolin. In the process of preparing modified kaolin, Comparative Example 2 omits the step of adding vinyl (trifluoromethyl) dimethyl silane, sodium dodecyl sulfate and emulsifier OP-10 for full emulsification. In the process of functional polyurethane prepolymer, Comparative Example 3 omits the addition of functionalized diol monomer. The coatings obtained in Comparative Examples 1-3 show varying degrees of decline in antibacterial and mildew-proof properties, waterproof and self-cleaning properties, mechanical properties and storage stability. The above experimental results show that both functionalized diol monomers and modified kaolin have a certain influence on the performance of the coating. Specifically, the structure of the functionalized diol monomer has a triazolopyrimidine structure and a carboxylic acid group with antibacterial activity. After the polyurethane chain segment is introduced through copolymerization, the antibacterial and mildew-proof properties and mechanical properties of the coating can be significantly improved. At the same time, the introduction of the carboxylic acid group can also improve the storage stability of the polyurethane coating. The modified kaolin added to the coating of the present invention introduces a trifluoromethyl (-CF 3 ), which greatly enhances the waterproof and self-cleaning properties of the coating; on the other hand, the polydopamine in the modified kaolin contains copper ions and catechol groups, forming a metal-phenol network, which not only improves the dispersibility of kaolin, but also further enhances the stability and antibacterial properties of the coating.

[0048] The above contents are merely examples and explanations of the concept of the present invention. Any modification or supplement made by a person skilled in the art to the described specific embodiments or any replacement by a similar method shall fall within the scope of protection required by the present invention.

Claims

1. A high performance polyurethane paint, characterized in that: The raw materials include the following by weight: 45-60 parts of functional polyurethane prepolymer, 4-7 parts of modified kaolin, 1-3 parts of propylene glycol methyl ether acetate, 0.1-0.5 parts of defoaming agent, 0.2-0.6 parts of leveling agent, 10-15 parts of titanium dioxide, and 0.5-1 parts of dispersant; The preparation steps of the functional polyurethane prepolymer are as follows: (1) Preparation of functionalized diol monomers; the specific steps are as follows: a. Under an inert gas atmosphere, CO2 was introduced into a mixed solution of ethylene glycol diglycidyl ether and tetraethylammonium bromide to a pressure of 4-5MPa, and the reaction was heated. After completion of the reaction, the crude product was collected and washed and dried to obtain an intermediate product; b. adding the intermediate product and 7-amino[1,2,4]triazolo[1,5-A]pyrimidine-6-carboxylic acid to a solvent for heating reaction, precipitating the reactant with glacial ether, washing it, and then drying it to obtain a functionalized diol monomer; (2) Polytetramethylene glycol, diisocyanate and dibutyltin dilaurate are mixed for a first reaction, and then a functionalized diol monomer is added for a second reaction to obtain a functional polyurethane prepolymer.

2. The high performance polyurethane paint according to claim 1, characterized in that The molar ratio of the polytetrahydrofuran diol, diisocyanate and functionalized diol monomer in step (2) is 1:(2.5-4):(0.3-0.8); the amount of dibutyltin dilaurate is 0.05-0.2% of the total weight of the polytetrahydrofuran diol and diisocyanate.

3. The high performance polyurethane paint according to claim 1, characterized in that: In step (2), the temperature of the first reaction is 75-85°C and the time is 1-3 hours; the temperature of the second reaction is 75-85°C and the time is 2-4 hours.

4. The high performance polyurethane paint according to claim 1, characterized in that: In step a, the mass ratio of ethylene glycol diglycidyl ether to tetraethylammonium bromide is 1:0.01-0.015; the temperature of the heating reaction is 110-130° C., and the time is 22-26 hours.

5. The high performance polyurethane paint according to claim 1, characterized in that: In step b, the mass ratio of the intermediate product to 7-amino[1,2,4]triazolo[1,5-A]pyrimidine-6-carboxylic acid is 1:0.6-1.5, the temperature of the heating reaction is 60-80°C, and the time is 18-24h.

6. The high performance polyurethane paint according to claim 1, characterized in that: The preparation steps of the modified kaolin are as follows: Add vinyl (trifluoromethyl) dimethylsilane, sodium dodecyl sulfate and emulsifier to the dopamine hydrochloride solution, and then add CuSO4 . 5H2O, H2O2 and kaolin are soaked, the product is collected, washed and dried to obtain.

7. The high performance polyurethane paint according to claim 6, characterized in that: The dopamine hydrochloride, vinyl (trifluoromethyl) dimethyl silane, sodium dodecyl sulfate, emulsifier, CuSO4 . The mass ratio of 5H2O, H2O2 and kaolin is 1: (8.3-8.5): (3.25-3.4): (6.5-7.5): (0.4-0.45): (1.1-1.46): (1.5-2.5).

8. The high performance polyurethane paint according to claim 6, characterized in that: The immersion treatment is carried out at a temperature of 70-80°C and for a time of 2-3 hours.

9. The method for preparing the high performance polyurethane paint according to claim 1, characterized in that: The method comprises the following steps: according to the weight ratio, functional polyurethane prepolymer, modified kaolin, defoamer, propylene glycol methyl ether acetate, dispersant, titanium dioxide and leveling agent are mixed and stirred evenly to obtain high-performance polyurethane paint.

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