Photovoltaic glass surface protective paint, preparation method thereof and preparation method of coating

Abstract

The invention discloses a photovoltaic glass surface protection coating, a preparation method thereof and a preparation method of a coating in the technical field of coatings. The coating comprises the following components in parts by weight: 40-70 parts of a fluorocarbon resin blend, 1-10 parts of modified nano silicon dioxide powder, 0.1-1 part of a defoaming agent, 0.1-2 parts of a flatting agent, 0.1-2 parts of a curing agent and 10-80 parts of an organic solvent A, the fluorocarbon resin blend comprises polyurethane resin, soluble polytetrafluoroethylene resin, polyacrylic acid fluorine-containing resin and an organic solvent B, and the mass ratio of the polyurethane resin to the soluble polytetrafluoroethylene resin to the polyacrylic acid fluorine-containing resin to the organic solvent B is (100-300): (5-20): (10-50): (200-500). The super-hydrophobic self-cleaning glass has the advantages that the super-hydrophobic self-cleaning glass has super-hydrophobic self-cleaning performance and super-high light transmittance.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and in particular to a protective coating for photovoltaic glass surfaces, its preparation method, and the method for preparing the coating. Background Technology

[0002] In recent years, solar photovoltaic power generation has become a key preferred choice for clean and green energy. Photovoltaic glass, with its high light transmittance, low reflectivity, high strength, and UV resistance, is one of the important materials in the photovoltaic industry, and the surface protection of photovoltaic glass is receiving increasing attention.

[0003] However, because photovoltaic panels are used in harsh outdoor environments for extended periods, the glass surface is susceptible to damage. Severe weather conditions can directly impact the glass, causing cracks and perforations. Prolonged exposure to wind and sun can cause the photovoltaic glass to age gradually, affecting its optical properties, reducing its light transmittance, and thus impacting the power generation efficiency of the photovoltaic panel. Simultaneously, the outdoor environment may contain various chemicals, such as acid rain, humidity, and salt spray, which can corrode the surface of the photovoltaic panel glass, causing spots, discoloration, or loss of luster, affecting its light transmittance and aesthetics. Furthermore, the accumulation of dust and dirt on the photovoltaic glass surface due to harsh environments severely affects light transmittance, impacting the power generation efficiency of the photovoltaic panel. Currently, ordinary photovoltaic glass surfaces are only treated with water washing and dust removal methods, often requiring extensive manual cleaning, which is inefficient and inconvenient.

[0004] Therefore, it is necessary to coat the surface of photovoltaic glass with a superhydrophobic and self-cleaning protective coating. Existing superhydrophobic coatings have shown strong application prospects in building exteriors, bridge steel structures, textiles, aerospace, and other fields. These new superhydrophobic coatings can achieve superhydrophobicity on various object surfaces, thus resisting the adhesion of water and other liquids. The rolling of water removes dust and other deposits from the substrate surface, achieving a self-cleaning effect. However, functional fillers are prone to agglomeration, forming numerous light scattering points in the coating, leading to a significant increase in haze. Furthermore, poor compatibility between the resin matrix and fillers, or insufficient weather resistance, can cause a decrease in light transmittance. Since photovoltaic glass has very high light transmittance requirements, how to achieve both superhydrophobic and self-cleaning properties and ultra-high light transmittance is a pressing problem to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a protective coating for photovoltaic glass surfaces, its preparation method, and the coating preparation method, which can have both superhydrophobic properties and ultra-high light transmittance.

[0006] To achieve the above-mentioned objectives, the photovoltaic glass surface protective coating, its preparation method, and the coating preparation method of the present invention adopt the following technical solutions:

[0007] A protective coating for photovoltaic glass surface comprises the following components in parts by weight: 40-70 parts of fluorocarbon resin blend, 1-10 parts of modified nano-silica powder, 0.1-1 part of defoamer, 0.1-2 parts of leveling agent, 0.1-2 parts of curing agent, and 10-80 parts of organic solvent A.

[0008] The fluorocarbon resin blend comprises polyurethane resin, soluble polytetrafluoroethylene resin, fluorinated polyacrylic acid resin, and organic solvent B, wherein the mass ratio of the polyurethane resin, soluble polytetrafluoroethylene resin, fluorinated polyacrylic acid resin, and organic solvent B is 100~300: 5~20: 10~50: 200~500.

[0009] Preferably, the soluble polytetrafluoroethylene resin is a copolymer of tetrafluoroethylene and vinyl perfluoropropane.

[0010] Preferably, the polyacrylic acid fluorinated resin is at least two of octafluoropentyl acrylate, dodecafluoroheptyl acrylate, n-butyl acrylate, and tert-butyl acrylate.

[0011] Preferably, the modified nano-silica powder is nano-silica with a surface modified by a silane coupling agent, wherein the silane coupling agent is one or more of γ-methacryloxypropyltrimethoxysilane, vinyltriethoxysilane, and perfluorooctyltriethoxysilane.

[0012] Preferably, the defoamer is one or more of BYK-A500 defoamer, M5600 silicone polymer defoamer, Glide B1484 defoamer, Tween 80, and polydimethylsiloxane; the leveling agent is one or more of Glide 450 leveling agent, BYK-333 leveling agent, EFKA3777 leveling agent, and VATiX 353 leveling agent; and the curing agent is one or more of isocyanate curing agent, polyol curing agent, and polyether curing agent.

[0013] Preferably, organic solvent A and organic solvent B are one or more of dichloromethane, ethanol, toluene, dimethyl carbonate, ethyl acetate, and butyl acetate.

[0014] A method for preparing a protective coating for photovoltaic glass surface includes the following steps:

[0015] (1) Preparation of fluorocarbon resin blend: Polyurethane resin, soluble polytetrafluoroethylene resin, fluorinated polyacrylic acid resin and organic solvent B are stirred at 20~30℃ for 2~5 hours to obtain fluorocarbon resin blend.

[0016] (2) Preparation of modified nano silica powder: Nano silica, silane coupling agent and organic solvent C are stirred at 20~70℃ for 1~3 hours. After the reaction is completed, the mixture is distilled under reduced pressure, filtered and dried to obtain modified nano silica powder.

[0017] (3) Mix the fluorocarbon resin blend, modified nano silica powder, defoamer, leveling agent, curing agent and organic solvent A, stir at room temperature for 2 to 5 hours to obtain a photovoltaic glass surface protective coating.

[0018] Preferably, the organic solvent C is one or more of dichloromethane, ethanol, toluene, dimethyl carbonate, ethyl acetate, and butyl acetate.

[0019] A method for preparing a protective coating on photovoltaic glass using a photovoltaic glass surface protective coating includes the following steps: spraying the photovoltaic glass surface protective coating onto the photovoltaic glass surface at a distance of 30-50 cm and an air pressure of 30-50 psi; after spraying, allowing it to dry at room temperature for 3-5 hours, and then heating and curing it at 80-110 degrees Celsius for 2-6 hours to form a photovoltaic glass surface protective coating.

[0020] A photovoltaic glass having a protective coating prepared by the above method on its surface.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. This invention, through the synergistic effect of fluorocarbon resin blends and modified nano-silica powder, not only endows the coating with superhydrophobic self-cleaning capabilities but also crucially solves the problem of incompatibility between protective coatings and high light transmittance. The fluorocarbon resin blend is a ternary blend of polyurethane resin, soluble polytetrafluoroethylene resin, and fluorinated polyacrylic acid resin in organic solvent B. The three components work synergistically to form a uniform and stable resin matrix, achieving excellent compatibility and dispersion stability of functional components. This effectively avoids light scattering problems caused by filler agglomeration and phase separation, thereby improving light transmittance. At the same time, the modified nano-silica powder is uniformly distributed in the coating, constructing a micro-nano rough structure. Its nanoscale and refractive matching characteristics minimize the obstruction and interference of light, thus giving the coating high light transmittance and low haze.

[0023] 2. The coating of this invention exhibits excellent comprehensive protective performance. The synergistic effect of the fluorocarbon resin blend and modified nano-silica powder forms a dense cross-linked network structure and a superhydrophobic surface with low surface energy, effectively blocking the intrusion of corrosive media such as acid rain and salt spray, and exhibiting excellent chemical corrosion resistance. The fluorocarbon resin blend also provides extremely strong UV resistance, heat resistance, and hydrolysis resistance, ensuring the durability of the coating under long-term outdoor exposure. At the same time, the introduction of polyurethane resin in the system significantly enhances the adhesion, toughness, and abrasion resistance of the coating, enabling it to withstand the physical wear caused by wind and sand erosion and daily cleaning, resulting in high mechanical strength and a long service life. Detailed Implementation

[0024] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0025] Example 1

[0026] A method for preparing a protective coating for photovoltaic glass surface includes the following steps:

[0027] (1) 100g of polyurethane resin, 15g of soluble polytetrafluoroethylene resin, 30g of polyacrylic acid fluorinated resin and 500g of toluene are stirred thoroughly at a stirring speed of 500 rpm and a stirring temperature of 20℃ for 2 hours to obtain a fluorocarbon resin blend with a solid content of 42%.

[0028] (2) Add 50 g of nano silica to 100 ml of ethanol, then add 0.5 g of vinyltriethoxysilane, then add 30 g of toluene, stir thoroughly at a stirring speed of 500 rpm, control the reaction temperature at 50°C, and after 1 hour of reaction, evaporate the solvent under reduced pressure, filter, and dry to obtain modified nano silica powder.

[0029] (3) 40g of fluorocarbon resin blend, 2g of modified nano silica powder, 1g of BYK-A500 defoamer, 1.5g of Glide 450 leveling agent, 0.5g of isocyanate curing agent, and 20g of toluene are stirred thoroughly at room temperature at a stirring speed of 500 rpm for 2 hours to obtain a photovoltaic glass surface protective coating.

[0030] A method for preparing a protective coating on photovoltaic glass includes the following steps:

[0031] The protective coating on the photovoltaic glass surface is applied by spraying at a distance of 30 cm and an air pressure of 30 psi. After spraying, the glass is allowed to dry at room temperature for 3 hours. Then, the glass with the protective coating is placed in an oven and heated at 80 degrees Celsius for 3 hours to cure and form a protective coating on the photovoltaic glass surface. The resulting photovoltaic glass surface has a superhydrophobic, high light transmittance, and excellent protective performance.

[0032] Example 2

[0033] A method for preparing a protective coating for photovoltaic glass surface includes the following steps:

[0034] (1) 300g of polyurethane resin, 20g of soluble polytetrafluoroethylene resin, 50g of polyacrylic acid fluorinated resin and 300g of ethyl acetate were stirred thoroughly at a stirring speed of 600 rpm and a stirring temperature of 20℃ for 3 hours to obtain a fluorocarbon resin blend with a solid content of 45%.

[0035] (2) Add 60 g of nano silica to 100 mL of ethanol, then add 0.75 g of γ-methacryloxypropyltrimethoxysilane coupling agent, then add 20 g of toluene, stir thoroughly at a stirring speed of 700 rpm, control the reaction temperature at 60 °C, and after a reaction time of 1.5 hours, evaporate the solvent under reduced pressure, filter, and dry to obtain modified nano silica powder.

[0036] (3) 60g of fluorocarbon resin blend, 8g of modified nano silica powder, 1.2g of M5600 silicone polymer defoamer, 1.8g of Glide 450 leveling agent, 0.7g of polyol curing agent, and 30g of ethyl acetate were stirred thoroughly at room temperature at a stirring speed of 800 rpm for 2 hours to obtain a photovoltaic glass surface protective coating.

[0037] A method for preparing a protective coating on photovoltaic glass includes the following steps:

[0038] The protective coating on the photovoltaic glass surface is applied by spraying at a distance of 40 cm and an air pressure of 40 psi. After spraying, the glass is allowed to dry at room temperature for 4 hours. Then, the glass with the protective coating is placed in an oven and heated at 90 degrees Celsius for 3 hours to cure and form a protective coating on the photovoltaic glass surface. The resulting photovoltaic glass surface has a superhydrophobic, high light transmittance, and excellent protective performance.

[0039] Example 3

[0040] A method for preparing a protective coating for photovoltaic glass surface includes the following steps:

[0041] (1) 200g of polyurethane resin, 5g of soluble polytetrafluoroethylene resin, 20g of polyacrylic acid fluorinated resin and 200g of dichloromethane were stirred thoroughly at a stirring speed of 800 rpm and a stirring temperature of 25℃ for 4 hours to obtain a fluorocarbon resin blend with a solid content of 36%.

[0042] (2) Add 70 g of nano silica to 100 mL of ethanol, then add 0.2 g of perfluorooctyltriethoxysilane coupling agent, then add 20 g of ethyl acetate, stir thoroughly at a stirring speed of 600 rpm, control the reaction temperature at 45 °C, and after 2 hours of reaction, evaporate the solvent under reduced pressure, filter, and dry to obtain modified nano silica powder.

[0043] (3) 70 g of fluorocarbon resin blend, 3.5 g of modified nano silica powder, 1 g of Tween 80 defoamer, 2 g of VATiX 353 leveling agent, 1.5 g of polyether curing agent and 70 g of dichloromethane were stirred thoroughly at room temperature at a stirring speed of 500 rpm for 2.5 hours to obtain a photovoltaic glass surface protective coating.

[0044] A method for preparing a protective coating on photovoltaic glass includes the following steps:

[0045] The protective coating on the photovoltaic glass surface is applied by spraying at a distance of 30 cm and an air pressure of 40 psi. After spraying, the glass is allowed to dry at room temperature for 4 hours. Then, the glass with the protective coating is placed in an oven and heated at 110 degrees Celsius for 2 hours to cure and form a protective coating on the photovoltaic glass surface. The resulting photovoltaic glass surface has a superhydrophobic, high light transmittance, and excellent protective performance.

[0046] Coating performance test:

[0047] The photovoltaic glass with protective coatings obtained in Examples 1 to 3, as well as photovoltaic glass coated with commercially available polyurethane protective coatings and photovoltaic glass coated with commercially available superhydrophobic coatings, were subjected to static water contact angle, roll-off angle, waterproof rating, light transmittance, abrasion resistance, salt spray resistance, and acid and alkali corrosion resistance tests. The waterproof rating test was conducted according to GB4208-2008; the abrasion resistance test was conducted according to GB / T 9266-2009; the salt spray test was conducted according to GB 6458-86; the acid and alkali resistance test was conducted according to GB / T9274-1988, with samples placed in 20% sulfuric acid, 10% hydrochloric acid, and 5% sodium hydroxide at room temperature; the withstand voltage test method was conducted according to GB / T 1408.1-2006; and the insulation resistance test method was conducted according to GB / T 1410-2006.

[0048] The test results are shown in Table 1.

[0049] Table 1: Comparison Test Results of Coating Performance

[0050]

[0051] The performance test results above show that the photovoltaic glass panel protective coating of the present invention has excellent superhydrophobic and self-cleaning functions, as well as excellent resistance to scrubbing, acid rain, salt spray and use in humid environments, and also has high light transmittance.

Claims

1. A protective coating for photovoltaic glass surfaces, characterized in that, The components include the following parts by weight: 40-70 parts of fluorocarbon resin blend, 1-10 parts of modified nano silica powder, 0.1-1 part of defoamer, 0.1-2 parts of leveling agent, 0.1-2 parts of curing agent, and 10-80 parts of organic solvent A. The fluorocarbon resin blend comprises polyurethane resin, soluble polytetrafluoroethylene resin, fluorinated polyacrylic acid resin, and organic solvent B, wherein the mass ratio of the polyurethane resin, soluble polytetrafluoroethylene resin, fluorinated polyacrylic acid resin, and organic solvent B is 100~300: 5~20: 10~50: 200~500.

2. The photovoltaic glass surface protective coating according to claim 1, characterized in that: The soluble polytetrafluoroethylene resin is a copolymer of tetrafluoroethylene and vinyl perfluoropropane.

3. The photovoltaic glass surface protective coating according to claim 1, characterized in that: The polyacrylic acid fluorinated resin is at least two of octafluoropentyl acrylate, dodecafluoroheptyl acrylate, n-butyl acrylate, and tert-butyl acrylate.

4. The photovoltaic glass surface protective coating according to claim 1, characterized in that: The modified nano silica powder is nano silica with a surface modified by a silane coupling agent, wherein the silane coupling agent is one or more of γ-methacryloyloxypropyltrimethoxysilane, vinyltriethoxysilane, and perfluorooctyltriethoxysilane.

5. The photovoltaic glass surface protective coating according to claim 1, characterized in that: The defoamer is one or more of the following: BYK-A500 defoamer, M5600 silicone polymer defoamer, Glide B 1484 defoamer, Tween 80, and polydimethylsiloxane. The leveling agent is one or more of Glide 450 leveling agent, BYK-333 leveling agent, EFKA3777 leveling agent, and VATiX 353 leveling agent; The curing agent is one or more of the following: isocyanate curing agent, polyol curing agent, and polyether curing agent.

6. The photovoltaic glass surface protective coating according to claim 1, characterized in that: Organic solvent A and organic solvent B are one or more of dichloromethane, ethanol, toluene, dimethyl carbonate, ethyl acetate, and butyl acetate.

7. A method for preparing a protective coating for photovoltaic glass surface based on any one of claims 1-6, characterized in that, Includes the following steps: (1) Preparation of fluorocarbon resin blend: Polyurethane resin, soluble polytetrafluoroethylene resin, fluorinated polyacrylic acid resin and organic solvent B are stirred at 20~30℃ for 2~5 hours to obtain fluorocarbon resin blend. (2) Preparation of modified nano silica powder: Nano silica, silane coupling agent and organic solvent C are stirred at 20~70℃ for 1~3 hours. After the reaction is completed, the mixture is distilled under reduced pressure, filtered and dried to obtain modified nano silica powder. (3) Mix the fluorocarbon resin blend, modified nano silica powder, defoamer, leveling agent, curing agent and organic solvent A, stir at room temperature for 2 to 5 hours to obtain a photovoltaic glass surface protective coating.

8. The method for preparing the protective coating for photovoltaic glass surface according to claim 7, characterized in that, The organic solvent C is one or more of dichloromethane, ethanol, toluene, dimethyl carbonate, ethyl acetate, and butyl acetate.

9. A method for preparing a protective coating on photovoltaic glass using a protective coating material as described in any one of claims 1-6, characterized in that, The process includes the following steps: spraying a protective coating onto the photovoltaic glass surface at a distance of 30-50 cm and an air pressure of 30-50 psi. After spraying, allow it to dry at room temperature for 3-5 hours, then heat it at 80-110 degrees Celsius for 2-6 hours to cure it, thus forming a protective coating on the photovoltaic glass surface.

10. A photovoltaic glass, characterized in that, Its surface has a protective coating prepared by the method described in claim 9.

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