Corrosion-resistant coating for photovoltaic module and preparation method of corrosion-resistant coating

Abstract

The invention relates to a corrosion-resistant coating for a photovoltaic module and a preparation method of the corrosion-resistant coating, and belongs to the technical field of high polymer materials. The corrosion-resistant coating for the photovoltaic module comprises the following components in parts by weight: 30-60 parts of acrylic resin, 10-30 parts of epoxy resin, 5-15 parts of a curing agent, 5-15 parts of a modified anti-yellowing agent, 10-30 parts of a composite filler, 4-10 parts of an auxiliary agent, 5-25 parts of a solvent and 0.5-3 parts of a plasticizer, the corrosion-resistant coating for the photovoltaic module prepared by the invention not only has good corrosion resistance and yellowing resistance, but also has excellent adhesive force and antibacterial effect.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to a corrosion-resistant coating for photovoltaic modules and a preparation method thereof. Background Art

[0002] Photovoltaic power generation, as a new clean energy source, offers significant advantages over traditional power generation methods, including environmental friendliness, pollution-free operation, and noise-free operation. Currently, integrating photovoltaic modules into architectural designs not only enhances the building's aesthetics but also achieves self-sufficiency in electricity generation, effectively avoiding environmental pollution. It is a sustainable new energy source that my country has been actively developing in recent years.

[0003] However, when photovoltaic modules are operated outdoors for a long time, they will face the test of various harsh climatic conditions such as high temperature, high humidity, and strong ultraviolet rays, which will reduce their power generation efficiency and shorten their service life. Coatings are an important protective layer for photovoltaic modules. Due to their performance characteristics such as water resistance, oil resistance, moisture and heat resistance, and weather resistance, they can effectively isolate and shield the damage of the outer layer to the substrate. However, long-term exposure to sunlight will accelerate aging, affect the service life, and make it difficult to meet the growing application needs. Therefore, the research and development of excellent corrosion-resistant coatings for photovoltaic modules has important practical significance and application value. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a corrosion-resistant coating for photovoltaic modules and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A corrosion-resistant coating for photovoltaic modules, comprising the following raw materials in parts by weight: 30-60 parts of acrylic resin, 10-30 parts of epoxy resin, 5-15 parts of curing agent, 5-15 parts of modified anti-yellowing agent, 10-30 parts of composite filler, 4-10 parts of auxiliary agent, 5-25 parts of solvent, and 0.5-3 parts of plasticizer;

[0007] The curing agent is hexamethylene diisocyanate;

[0008] The auxiliary agent is dibutyltin dilaurate;

[0009] The solvent is butyl acetate;

[0010] The plasticizer is polyethylene glycol.

[0011] The modified anti-yellowing agent is prepared by the following method:

[0012] Step A1: Add oxybenzone, triethylamine, and tetrahydrofuran to a four-necked flask equipped with a stirring motor, a thermometer, and a reflux condenser, mix well, and slowly add 4-pentenoyl chloride dropwise in an ice bath for 2 hours. The reaction is allowed to proceed for 5 hours. After the reaction is complete, filter, wash, and vacuum dry to obtain the compound.

[0013] Furthermore, the usage ratio of oxybenzone, triethylamine, tetrahydrofuran, and 4-pentenoyl chloride is 0.01-0.03 mol: 2-4 mL: 10-20 mL: 0.01-0.03 mol;

[0014] First, the hydroxyl group of oxybenzone reacts with the acid chloride of 4-pentenoyl chloride to synthesize the compound;

[0015] Step A2: p-Aminophenol, maleic anhydride, and tetrahydrofuran are uniformly mixed and stirred in an ice-water bath for 5-10 minutes. The system temperature is adjusted to -5-0°C, and triethylamine, toluene, and phenylphosphonium dichloride are added dropwise. After the addition is complete, the temperature is slowly raised to 75°C and kept at this temperature for 3 hours. After the reaction is completed, the mixture is cooled to room temperature and dried to obtain a pre-product.

[0016] Furthermore, the usage ratio of p-aminophenol, maleic anhydride, tetrahydrofuran, triethylamine, toluene, and phenylphosphonium dichloride is 0.02-0.04 mol: 0.02-0.04 mol: 10 mL: 5.5 mL: 50 mL: 0.01-0.02 mol;

[0017] Secondly, the amino group of p-aminophenol reacts with maleic anhydride, and then the hydroxyl group of p-aminophenol reacts with the chlorine atom of phenylphosphonium dichloride to generate a pre-product;

[0018] Step A3: Disperse the compound and benzoyl peroxide evenly in xylene, then add the pre-product and stir evenly. Under nitrogen protection, heat the reaction system to 90° C., react for 4-5 hours, distill under reduced pressure, cool to room temperature, wash, filter, and vacuum dry to obtain a modified anti-yellowing agent.

[0019] Furthermore, the ratio of the compound, benzoyl peroxide, xylene, and pre-product is 0.01-0.03 mol: 0.01-0.06 g: 10-40 mL: 0.01-0.03 mol;

[0020] Finally, the carbon-carbon double bond of the compound and the pre-product is used for copolymerization to generate a modified anti-yellowing agent.

[0021] The composite filler is prepared by the following method:

[0022] Step B1: Boron nitride was uniformly dispersed in a NaOH solution, stirred for 12 hours, 3-aminopropyltriethoxysilane and ethanol were added and mixed, the pH was adjusted to 5, and the mixture was stirred in a 65°C water bath for 8 hours. Cinnamic acid was then added, and the mixture was ultrasonically treated for 2 hours. The mixture was centrifuged, washed, and dried at 45°C to obtain an intermediate.

[0023] Furthermore, the usage ratio of boron nitride, NaOH solution, 3-aminopropyltriethoxysilane, ethanol, and cinnamic acid is 0.03-0.06 mol: 12-16 g: 0.01-0.02 mol: 3.2-3.8 mL: 0.01-0.02 mol, and the mass fraction of NaOH solution is 8-18%;

[0024] First, boron nitride is reacted with 3-aminopropyltriethoxysilane to make its surface contain amino groups, and then the amino groups are reacted with the carboxyl groups of cinnamic acid to prepare an intermediate;

[0025] Step B2: The intermediate, tris(hydroxymethyl)aminomethane, and deionized water were mixed, the pH was adjusted to 8.5, dopamine hydrochloride was added, ultrasonic treatment was performed for 30 minutes, stirring was performed at room temperature for 24 hours, vacuum filtration was performed, washing was performed, and vacuum drying was performed at 60°C for 24 hours to obtain a composite filler;

[0026] Furthermore, the ratio of the intermediate, tris(hydroxymethyl)aminomethane, deionized water, and dopamine hydrochloride is 6-8 g: 5-10 g: 500-900 mL: 2.4 g;

[0027] Finally, dopamine hydrochloride is self-polymerized on the surface of the intermediate to generate polydopamine to prepare a composite filler.

[0028] A method for preparing a corrosion-resistant coating for photovoltaic modules comprises the following steps:

[0029] S1. Place acrylic resin and epoxy resin in a solvent and ultrasonically treat for 10-20 minutes to prepare a dispersion;

[0030] S2. Add the curing agent, modified anti-yellowing agent, composite filler, additive and plasticizer into the dispersion and stir for 5-10 minutes to mix evenly to prepare the corrosion-resistant coating for photovoltaic modules.

[0031] Beneficial effects of the present invention:

[0032] The corrosion-resistant coating for photovoltaic modules prepared by the present invention not only has good corrosion resistance and anti-yellowing properties, but also has excellent adhesion and antibacterial effects, thereby effectively extending the service life of the material.

[0033] The modified anti-yellowing agent prepared by the present invention exhibits performance that surpasses traditional small molecule anti-yellowing agents due to its advantages as a macromolecular polymer. The pre-product containing phosphite in the modified anti-yellowing agent can not only effectively decompose the hydroperoxides in the acrylic resin, prevent free radical oxidation reactions, and improve the stability of the coating, but also inhibit yellowing at high temperatures by virtue of its strong redox effect, thereby maintaining the good appearance of the coating. In addition, the benzene ring and methoxy structure of hydroxybenzophenone can effectively absorb ultraviolet rays and convert them into harmless heat energy, synergizing with the pre-product containing phosphite to protect the material from ultraviolet damage. At the same time, a conjugated system can be formed between the benzene ring and carbonyl group of hydroxybenzophenone. Under ultraviolet irradiation, electronic excitation transitions are achieved through thermal vibrations, and energy is released in the form of weak long-wave emission, effectively resisting the hazards of high-energy ultraviolet rays and extending the service life of the material. In addition, the maleimide group formed by maleic anhydride and amino group increases the glass transition temperature, melting point and heat resistance of the material by enhancing the intermolecular force, thereby reducing yellowing caused by high-temperature thermal aging.

[0034] In the composite filler prepared by the present invention, boron nitride, as a high-performance hard filler, can not only extend the diffusion path of the corrosive medium to the substrate, effectively block the penetration of water molecules, ions and oxygen, and enhance the anti-corrosion performance of the coating, but also has excellent thermal conductivity, which can improve the thermal conductivity of the coating, contribute to the heat dissipation of the photovoltaic module, so that it can be within a suitable operating temperature range, and can also improve the adhesion and hardness of the coating, thereby extending the service life of the coating in harsh environments; at the same time, polydopamine itself has excellent dispersibility, which can promote the uniform dispersion of the composite filler in the epoxy resin matrix, effectively avoid the agglomeration and phase separation of the nanofiller, enhance the interfacial bonding force between the filler and the resin matrix, and thus improve the overall performance; in addition, polydopamine has excellent adhesion properties, which can further improve the adhesion of the epoxy resin and prevent peeling, debonding and cracking caused by different environments; in addition, the introduced cinnamic acid can inhibit protein synthesis, destroy the cell membrane and cell wall of bacteria, effectively inhibit the reproduction of bacteria and inactivate them, thereby giving the coating excellent antibacterial ability. DETAILED DESCRIPTION

[0035] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0036] Example 1: A method for preparing a corrosion-resistant coating for photovoltaic modules, comprising the following steps:

[0037] S1. Weigh the raw materials by weight: 30 parts of acrylic resin, 10 parts of epoxy resin, 5 parts of curing agent, 5 parts of modified anti-yellowing agent (prepared in this example), 10 parts of composite filler (prepared in this example), 4 parts of auxiliary agent, 5 parts of solvent, and 0.5 parts of plasticizer; place the acrylic resin and epoxy resin in the solvent and ultrasonically treat for 10 minutes to prepare a dispersion;

[0038] S2. adding hexamethylene diisocyanate, modified anti-yellowing agent, composite filler, dibutyltin dilaurate and polyethylene glycol to the dispersion and stirring for 5 minutes to mix evenly to prepare a corrosion-resistant coating for photovoltaic modules;

[0039] The modified anti-yellowing agent is prepared by the following method:

[0040] Step A1: In a four-necked flask equipped with a stirring motor, a thermometer, and a reflux condenser, 0.01 mol of oxybenzone, 2 mL of triethylamine, and 10 mL of tetrahydrofuran were added and mixed uniformly. In an ice bath, 0.01 mol of 4-pentenoyl chloride was slowly added dropwise over 2 hours. The reaction was allowed to proceed for 5 hours. After completion of the reaction, the mixture was filtered, washed, and dried in vacuo to obtain the compound.

[0041] Step A2: 0.02 mol of p-aminophenol, 0.02 mol of maleic anhydride, and 10 mL of tetrahydrofuran were mixed uniformly, stirred in an ice-water bath for 5 min, the system temperature was adjusted to -5°C, 5.5 mL of triethylamine, 50 mL of toluene, and 0.01 mol of phenylphosphonium dichloride were added dropwise, and after the addition, the temperature was slowly raised to 75°C and kept at this temperature for 3 h. After the reaction, the mixture was cooled to room temperature and dried to obtain a pre-product;

[0042] Step A3: Disperse 0.01 mol of the compound and 0.01 g of benzoyl peroxide in 10 mL of xylene, then add 0.01 mol of the pre-product and stir evenly. Under nitrogen protection, heat the reaction system to 90° C., react for 4 hours, distill under reduced pressure, cool to room temperature, wash, filter, and vacuum dry to obtain a modified anti-yellowing agent.

[0043] The composite filler is prepared by the following method:

[0044] Step B1: 0.03 mol of boron nitride was uniformly dispersed in 12 g of NaOH solution, stirred for 12 h, 0.01 mol of 3-aminopropyltriethoxysilane and 3.2 mL of ethanol were added, the mixture was adjusted to pH 5, and stirred in a 65°C water bath for 8 h. 0.01 mol of cinnamic acid was then added, and the mixture was ultrasonically treated for 2 h. The mixture was centrifuged, washed, and dried at 45°C to obtain an intermediate. The mass fraction of the NaOH solution was 8%;

[0045] Step B2: 6 g of the intermediate, 5 g of tris(hydroxymethyl)aminomethane, and 500 mL of deionized water were mixed, the pH was adjusted to 8.5, 2.4 g of dopamine hydrochloride was added, ultrasonic treatment was performed for 30 min, stirring was performed at room temperature for 24 h, vacuum filtration was performed, washing was performed, and vacuum drying was performed at 60° C. for 24 h to obtain a composite filler.

[0046] Example 2: A method for preparing a corrosion-resistant coating for photovoltaic modules, comprising the following steps:

[0047] S1. Weigh the raw materials by weight: 45 parts of acrylic resin, 20 parts of epoxy resin, 10 parts of curing agent, 10 parts of modified anti-yellowing agent (prepared in this example), 20 parts of composite filler (prepared in this example), 7 parts of auxiliary agent, 15 parts of solvent, and 1.7 parts of plasticizer; place the acrylic resin and epoxy resin in the solvent and ultrasonically treat for 15 minutes to prepare a dispersion;

[0048] S2. adding hexamethylene diisocyanate, modified anti-yellowing agent, composite filler, dibutyltin dilaurate and polyethylene glycol to the dispersion and stirring for 7.5 minutes to mix evenly to prepare a corrosion-resistant coating for photovoltaic modules;

[0049] The modified anti-yellowing agent is prepared by the following method:

[0050] Step A1: In a four-necked flask equipped with a stirring motor, a thermometer, and a reflux condenser, 0.02 mol of oxybenzone, 3 mL of triethylamine, and 15 mL of tetrahydrofuran were added and mixed uniformly. In an ice bath, 0.02 mol of 4-pentenoyl chloride was slowly added dropwise over 2 hours. The reaction was allowed to proceed for 5 hours. After completion of the reaction, the mixture was filtered, washed, and dried in vacuo to obtain the compound.

[0051] Step A2: 0.03 mol of p-aminophenol, 0.03 mol of maleic anhydride, and 10 mL of tetrahydrofuran were mixed uniformly, stirred in an ice-water bath for 7.5 min, the system temperature was adjusted to -2.5°C, 5.5 mL of triethylamine, 50 mL of toluene, and 0.015 mol of phenylphosphonium dichloride were added dropwise, and after the addition, the temperature was slowly raised to 75°C and kept at this temperature for 3 h. After the reaction, the mixture was cooled to room temperature and dried to obtain a pre-product;

[0052] Step A3: 0.02 mol of the compound and 0.035 g of benzoyl peroxide were evenly dispersed in 25 mL of xylene, and 0.02 mol of the pre-product was added and stirred evenly. Under nitrogen protection, the reaction system was heated to 90° C. and reacted for 4.5 hours. The mixture was distilled under reduced pressure and cooled to room temperature. The mixture was washed, filtered, and vacuum dried to obtain a modified anti-yellowing agent.

[0053] The composite filler is prepared by the following method:

[0054] Step B1: 0.045 mol of boron nitride was uniformly dispersed in 14 g of NaOH solution, stirred for 12 h, 0.015 mol of 3-aminopropyltriethoxysilane and 3.5 mL of ethanol were added, the mixture was adjusted to pH 5, and stirred in a 65°C water bath for 8 h. 0.015 mol of cinnamic acid was then added, and the mixture was ultrasonically treated for 2 h. The mixture was centrifuged, washed, and dried at 45°C to obtain an intermediate. The mass fraction of the NaOH solution was 13%;

[0055] Step B2: 7 g of the intermediate, 7.5 g of tris(hydroxymethyl)aminomethane, and 700 mL of deionized water were mixed, the pH was adjusted to 8.5, 2.4 g of dopamine hydrochloride was added, and the mixture was ultrasonically treated for 30 min. The mixture was stirred at room temperature for 24 h, vacuum filtered, washed, and vacuum dried at 60° C. for 24 h to obtain a composite filler.

[0056] Example 3: A method for preparing a corrosion-resistant coating for photovoltaic modules, comprising the following steps:

[0057] S1. Weigh the raw materials by weight: 60 parts of acrylic resin, 30 parts of epoxy resin, 15 parts of curing agent, 15 parts of modified anti-yellowing agent (prepared in this example), 30 parts of composite filler (prepared in this example), 10 parts of auxiliary agent, 25 parts of solvent, and 3 parts of plasticizer; place the acrylic resin and epoxy resin in the solvent and ultrasonically treat for 20 minutes to prepare a dispersion;

[0058] S2. adding hexamethylene diisocyanate, modified anti-yellowing agent, composite filler, dibutyltin dilaurate and polyethylene glycol to the dispersion and stirring for 10 minutes to mix evenly to prepare a corrosion-resistant coating for photovoltaic modules;

[0059] The modified anti-yellowing agent is prepared by the following method:

[0060] Step A1: In a four-necked flask equipped with a stirring motor, a thermometer, and a reflux condenser, 0.03 mol of oxybenzone, 4 mL of triethylamine, and 20 mL of tetrahydrofuran were added and mixed uniformly. In an ice bath, 0.03 mol of 4-pentenoyl chloride was slowly added dropwise over 2 hours. The reaction was allowed to proceed for 5 hours. After completion of the reaction, the mixture was filtered, washed, and dried in vacuo to obtain the compound.

[0061] Step A2: 0.04 mol of p-aminophenol, 0.04 mol of maleic anhydride, and 10 mL of tetrahydrofuran were mixed uniformly, stirred in an ice-water bath for 10 min, and the system temperature was adjusted to 0°C. 5.5 mL of triethylamine, 50 mL of toluene, and 0.02 mol of phenylphosphonium dichloride were added dropwise. After the addition, the temperature was slowly raised to 75°C and kept at this temperature for 3 h. After the reaction, the mixture was cooled to room temperature and dried to obtain a pre-product.

[0062] Step A3: 0.03 mol of the compound and 0.06 g of benzoyl peroxide were evenly dispersed in 40 mL of xylene, and 0.03 mol of the pre-product was added and stirred evenly. Under nitrogen protection, the reaction system was heated to 90° C. and reacted for 5 h. The mixture was distilled under reduced pressure and cooled to room temperature. The mixture was washed, filtered, and vacuum dried to obtain a modified anti-yellowing agent.

[0063] The composite filler is prepared by the following method:

[0064] Step B1: 0.06 mol of boron nitride was uniformly dispersed in 16 g of NaOH solution, stirred for 12 h, 0.02 mol of 3-aminopropyltriethoxysilane and 3.8 mL of ethanol were added, the mixture was adjusted to pH 5, and stirred in a 65°C water bath for 8 h. 0.02 mol of cinnamic acid was then added, and the mixture was ultrasonically treated for 2 h. The mixture was centrifuged, washed, and dried at 45°C to obtain an intermediate. The mass fraction of the NaOH solution was 18%;

[0065] Step B2: 8 g of the intermediate, 10 g of tris(hydroxymethyl)aminomethane, and 900 mL of deionized water were mixed, the pH was adjusted to 8.5, 2.4 g of dopamine hydrochloride was added, ultrasonic treatment was performed for 30 min, stirring was performed at room temperature for 24 h, vacuum filtration was performed, washing was performed, and vacuum drying was performed at 60° C. for 24 h to obtain a composite filler.

[0066] Comparative Example 1: This comparative example is a corrosion-resistant coating for photovoltaic modules. The difference from Example 3 is that the modified anti-yellowing agent prepared in Example 3 is used with an equal amount of 2,6-di-tert-butyl-p-cresol, and the rest are the same.

[0067] Comparative Example 2: This comparative example is a corrosion-resistant coating for photovoltaic modules. The difference from Example 3 is that an equal amount of silicon carbide is used to replace the composite filler prepared in Example 3, and the rest are the same.

[0068] Performance test: The photovoltaic modules prepared in Examples 1-3 and Comparative Examples 1-2 were coated with corrosion-resistant coatings, cut into standard test sizes, and placed in a UV aging box at 60°C and 0.86w / cm 2 After 1000 hours of ultraviolet light exposure, the yellowing index change difference was tested. A larger difference indicates a worse anti-yellowing performance. Adhesion tests were conducted according to ASTM D3359, antibacterial tests were conducted according to GB / T 1727-1992, and chemical corrosion resistance time tests were conducted. The test results are shown in Table 1 below:

[0069] Table 1

[0070]

[0071] It can be seen from the test data in Table 1 that the corrosion-resistant coating for photovoltaic modules prepared by the present invention not only has good corrosion resistance and anti-yellowing properties, but also has excellent adhesion and antibacterial effects, thereby extending the service life of the material.

[0072] The above content is merely an example and explanation of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A method for preparing a corrosion-resistant coating for photovoltaic modules, characterized in that: The following steps are involved: S1. Weigh the raw materials by weight: 30-60 parts of acrylic resin, 10-30 parts of epoxy resin, 5-15 parts of curing agent, 5-15 parts of modified anti-yellowing agent, 10-30 parts of composite filler, 4-10 parts of auxiliary agent, 5-25 parts of solvent, and 0.5-3 parts of plasticizer; place the acrylic resin and epoxy resin in a solvent and ultrasonically treat for 10-20 minutes to prepare a dispersion; S2. Add the curing agent, modified anti-yellowing agent, composite filler, additive and plasticizer to the dispersion and stir for 5-10 minutes to mix evenly to prepare a corrosion-resistant coating for photovoltaic modules; The modified anti-yellowing agent is prepared by the following method: Step A1: Add oxybenzone, triethylamine, and tetrahydrofuran to a four-necked flask equipped with a stirring motor, a thermometer, and a reflux condenser, mix well, and slowly add 4-pentenoyl chloride dropwise in an ice bath for 2 hours. The reaction is allowed to proceed for 5 hours. After the reaction is complete, filter, wash, and vacuum dry to obtain the compound. Step A2: p-Aminophenol, maleic anhydride, and tetrahydrofuran are uniformly mixed and stirred in an ice-water bath for 5-10 minutes. The system temperature is adjusted to -5-0°C, and triethylamine, toluene, and phenylphosphonium dichloride are added dropwise. After the addition is complete, the temperature is slowly raised to 75°C and kept at this temperature for 3 hours. After the reaction is completed, the mixture is cooled to room temperature and dried to obtain a pre-product. Step A3: Disperse the compound and benzoyl peroxide evenly in xylene, then add the pre-product and stir evenly. Under nitrogen protection, heat the reaction system to 90°C, react for 4-5 hours, distill under reduced pressure, cool to room temperature, wash, filter, and vacuum dry to obtain a modified anti-yellowing agent.

2. The method for preparing a corrosion-resistant coating for photovoltaic modules according to claim 1, characterized in that: In step A1, the usage ratio of oxybenzone, triethylamine, tetrahydrofuran, and 4-pentenoyl chloride is 0.01-0.03 mol: 2-4 mL: 10-20 mL: 0.01-0.03 mol.

3. The method for preparing a corrosion-resistant coating for photovoltaic modules according to claim 1, characterized in that: In step A2, the usage ratio of p-aminophenol, maleic anhydride, tetrahydrofuran, triethylamine, toluene, and phenylphosphonium dichloride is 0.02-0.04 mol: 0.02-0.04 mol: 10 mL: 5.5 mL: 50 mL: 0.01-0.02 mol.

4. The method for preparing a corrosion-resistant coating for photovoltaic modules according to claim 1, characterized in that: In step A3, the usage ratio of the compound, benzoyl peroxide, xylene, and pre-product is 0.01-0.03 mol: 0.01-0.06 g: 10-40 mL: 0.01-0.03 mol.

5. The method for preparing a corrosion-resistant coating for photovoltaic modules according to claim 1, characterized in that: The composite filler is prepared by the following method: Step B1: Boron nitride was uniformly dispersed in a NaOH solution, stirred for 12 hours, 3-aminopropyltriethoxysilane and ethanol were added and mixed, the pH was adjusted to 5, and the mixture was stirred in a 65°C water bath for 8 hours. Cinnamic acid was then added, and the mixture was ultrasonically treated for 2 hours. The mixture was centrifuged, washed, and dried at 45°C to obtain an intermediate. Step B2: The intermediate, tris(hydroxymethyl)aminomethane) and deionized water were mixed, the pH was adjusted to 8.5, dopamine hydrochloride was added, ultrasonic treatment was performed for 30 minutes, stirring was performed at room temperature for 24 hours, vacuum filtration was performed, washing was performed, and vacuum drying was performed at 60° C. for 24 hours to obtain a composite filler.

6. The method for preparing a corrosion-resistant coating for photovoltaic modules according to claim 5, characterized in that: In step B1, the usage ratio of boron nitride, NaOH solution, 3-aminopropyltriethoxysilane, ethanol, and cinnamic acid is 0.03-0.06 mol: 12-16 g: 0.01-0.02 mol: 3.2-3.8 mL: 0.01-0.02 mol, and the mass fraction of NaOH solution is 8-18%.

7. The method for preparing a corrosion-resistant coating for photovoltaic modules according to claim 5, characterized in that: The usage ratio of the intermediate, tris(hydroxymethyl)aminomethane, deionized water, and dopamine hydrochloride in step B2 is 6-8 g: 5-10 g: 500-900 mL: 2.4 g.

8. The method for preparing a corrosion-resistant coating for photovoltaic modules according to claim 1, characterized in that: The curing agent is hexamethylene diisocyanate, the auxiliary agent is dibutyltin dilaurate, the solvent is butyl acetate, and the plasticizer is polyethylene glycol.

9. A corrosion-resistant coating for photovoltaic modules, characterized in that: Prepared according to the preparation method according to any one of claims 1 to 8.

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