A weather-resistant self-cleaning silicone coating and its preparation method and application

Abstract

The present invention belongs to the technical field of organic silicon coatings, and discloses a weather-resistant self-cleaning organic silicon coating and its preparation method and application. The weather-resistant self-cleaning organic silicon coating includes the following components in parts by weight: 50 to 100 parts of α, ω-dihydroxy polysiloxane; 20 to 50 parts of alkoxy-modified fluorinated polysiloxane; 20 to 30 parts of MQ silicone resin; 0.01 to 0.05 parts of catalyst; 100 to 250 parts of solvent oil. The organic silicon coating of the present invention can significantly improve the hydrophobic self-cleaning effect and adhesion of the coating by adding a specific alkoxy-modified fluorinated polysiloxane as a hydrophobic modifier. And MQ silicone resin is used instead of conventional silica as a reinforcing filler, which has better compatibility with a silicone rubber matrix, can significantly improve the transparency of the coating, and improve its application effect on the surface of a photovoltaic panel.

Description

Technical Field

[0001] The invention belongs to the technical field of organic silicon coatings, and in particular relates to a weather-resistant self-cleaning organic silicon coating and a preparation method and application thereof. Background Art

[0002] With the progress of urbanization, clean energy such as solar energy has received more and more attention. Photovoltaic panels are particularly prone to stubborn stains due to dust and oil under natural conditions of wind and sun, which reduces the conversion rate of light energy. The application of hydrophobic self-cleaning coatings on the surface of photovoltaic panels can effectively reduce the adhesion of dust on photovoltaic panels, improve power generation efficiency, reduce cleaning costs, and extend service life, so it has been widely used. Among them, fluorine-containing silicone coatings are increasingly receiving attention because of their low surface tension and excellent weather resistance, stain resistance, hydrophobicity, oleophobicity, acid and alkali resistance, etc.

[0003] Patent CN 107163783 A discloses an anti-attenuation coating for the surface layer of a photovoltaic glass panel, comprising the following raw materials in weight percentage: 8%-20% fluorosilicone copolymer resin, 5%-12% silica, 2%-8% dispersant, 1%-5% penetrant, 0.5%-2% defoamer, 1.5%-5% leveling agent, and the remainder is diluent. However, the fluorosilicone copolymer resin used in the coating is a fluorosilicone-modified epoxy resin or a fluorosilicone-modified acrylic resin, which has low strength and slightly poor weather resistance. At the same time, a high content of dispersant, penetrant, defoamer and leveling agent is required to promote the dispersion and compatibility of the reinforcing filler silica to improve strength and transparency. However, the dispersant, penetrant, defoamer and leveling agent used are all small molecular components or water-soluble components, and the film-forming material is easily decomposed or detached by catalysis such as sun exposure and rain, resulting in low durability of the coating. Patent CN113088190 A discloses a fluorine-containing organic polysiloxane self-cleaning coating, which is obtained by condensation crosslinking reaction of any one of 1H,1H,2H,2H-perfluorodecyltriethoxysilane, 1H,1H,2H,2H-perfluorododecyltriethoxysilane, 1H,1H,2H,2H-perfluoroheptadecanetrimethoxysilane and any one of poly(dimethoxy)silane PDMOS and poly(diethoxy)silane POEOS siloxane prepolymers. However, the self-condensation crosslinking of the above-mentioned fluorine-containing siloxane precursors is difficult to control, and the compatibility of the self-condensation crosslinking product with the siloxane prepolymer is poor, resulting in whitening of the coating and low transparency, and is not suitable for the preparation of photovoltaic panel surface coatings. Summary of the invention

[0004] In view of the shortcomings and deficiencies of the above prior art, the primary purpose of the present invention is to provide a weather-resistant self-cleaning silicone coating.

[0005] Another object of the present invention is to provide a method for preparing the weather-resistant self-cleaning silicone coating.

[0006] Another object of the present invention is to provide the use of the weather-resistant self-cleaning silicone coating in a self-cleaning coating on the surface of a photovoltaic panel.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] A weather-resistant self-cleaning silicone coating comprises the following components in parts by weight:

[0009] 50-100 parts of α,ω-dihydroxy polysiloxane;

[0010] 20 to 50 parts of alkoxy-modified fluorinated polysiloxane;

[0011] MQ silicone resin 20-30 parts;

[0012] Catalyst 0.01-0.05 parts;

[0013] 100-250 parts of solvent oil;

[0014] The alkoxy-modified fluorinated polysiloxane is prepared by the following method:

[0015] Hydrogen-containing silicone oil, a fluorine-containing monomer containing an unsaturated double bond, and a silane coupling agent containing an unsaturated double bond are added to an organic solvent and mixed evenly, the temperature is raised to 70-100° C., and after deoxygenation and dehydration with nitrogen, a chloroplatinic acid catalyst solution is added and stirred to react until the unsaturated double bond reaction is complete, and the organic solvent is removed under reduced pressure to obtain an alkoxy-modified fluorine-containing polysiloxane.

[0016] The alkoxy-modified fluorinated polysiloxane has the following molecular structure:

[0017]

[0018] In the above structural formula, -R f represents a fluorine-containing group, -OR represents an alkoxy group, and R1 and R2 represent connecting groups after silylation; wherein a, b, m, and n can be adjusted according to the molecular weight and hydrogen content of the hydrogen-containing silicone oil, and the added ratio of the fluorine-containing monomer containing an unsaturated double bond and the silane coupling agent containing an unsaturated double bond.

[0019] Furthermore, the viscosity of the hydrogen-containing silicone oil is 100 to 1000 mPa·s (25° C.), and the hydrogen content is 0.3 to 1.5 wt.%.

[0020] Furthermore, the fluorine-containing monomer containing an unsaturated double bond is a perfluoroalkylethylene, a perfluoroalkylvinyl ether or a perfluoroalkylacrylate.

[0021] Furthermore, the silane coupling agent containing unsaturated double bonds is vinyltrimethoxysilane, vinyltriethoxysilane, methacryloxypropyltrimethoxysilane or methacryloxypropyltriethoxysilane.

[0022] More preferably, the molar ratio of the hydrogen-containing silicone oil to the fluorine-containing monomer containing an unsaturated double bond and the silane coupling agent containing an unsaturated double bond is 1:0.1-0.5:0.1-0.5, calculated based on hydrogen content.

[0023] Furthermore, the viscosity of the α,ω-dihydroxy polysiloxane is 1000 to 10000 mPa·s (25° C.).

[0024] Furthermore, the MQ silicone resin is methyl MQ silicone resin, hydrogenated MQ silicone resin, vinyl MQ silicone resin or alkoxy-modified MQ silicone resin. More preferably, it is alkoxy-modified MQ silicone resin, and the alkoxy-modified MQ silicone resin is prepared by the following method:

[0025] The hydrogen-containing MQ silicone resin and the silane coupling agent containing unsaturated double bonds are added to an organic solvent and mixed evenly, and the temperature is raised to 70-100° C. After deoxygenation and dehydration with nitrogen, a chloroplatinic acid catalyst solution is added and stirred to react until the unsaturated double bonds react completely, and the organic solvent is removed under reduced pressure to obtain an alkoxy-modified MQ silicone resin.

[0026] Furthermore, the hydrogen content of the hydrogen-containing MQ silicone resin is 0.05-1.0 wt.%, and the M / Q value is 0.6-1.8. More preferably, the hydrogen content of the hydrogen-containing MQ silicone resin is 0.1-0.5 wt.%, and the M / Q value is 0.7-1.2.

[0027] The present invention can adjust the content of alkoxy crosslinking groups and the proportion of Q chain segment cores through the hydrogen content and M / Q value of the hydrogen-containing MQ silicone resin, thereby achieving good reinforcement effect while ensuring good transparency and hydrophobicity.

[0028] Furthermore, the molar ratio of the silane coupling agent containing unsaturated double bonds to the hydrogen content in the hydrogen-containing MQ silicone resin is 0.2-0.8:1.

[0029] Furthermore, the catalyst is dibutyltin dilaurate.

[0030] The preparation method of the weather-resistant self-cleaning silicone coating comprises the following preparation steps:

[0031] α,ω-dihydroxy polysiloxane, alkoxy-modified fluorinated polysiloxane, MQ silicone resin and catalyst are added into solvent oil under the condition of isolating water vapor, stirred and mixed evenly, and sealed and packaged to obtain weather-resistant self-cleaning silicone coating.

[0032] The above-mentioned weather-resistant self-cleaning silicone coating is used in the self-cleaning coating on the surface of photovoltaic panels.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) The organosilicon coating of the present invention adds a specific alkoxy-modified fluorinated polysiloxane as a hydrophobic modifier, and the controllability of the fluorinated side chain grafted by a highly selective hydrosilylation reaction is strong, and the hydrophobic self-cleaning effect is significantly improved. At the same time, the alkoxy group contained in it can further undergo dealcoholization condensation chemical crosslinking with α,ω-dihydroxy polysiloxane, significantly improving the uniformity of the system and improving the strength and adhesion of the coating.

[0035] (2) The present invention uses MQ silicone resin instead of conventional silica as a reinforcing filler, which has better compatibility with the silicone rubber matrix, can significantly improve the transparency of the coating film, and improve its application effect on the surface of the photovoltaic panel.

[0036] (3) The present invention can further use alkoxy-modified MQ silicone resin as a reinforcing filler and crosslinking agent. Its tightly structured Q chain segment core can provide a good reinforcing effect; at the same time, the alkoxy groups contained on the surface can further undergo dealcoholization condensation chemical crosslinking with α,ω-dihydroxy polysiloxane to form a clustered crosslinking center, which significantly improves the strength and adhesion of the coating. In addition, the chemically linked MQ silicone resin has better compatibility in the system and can significantly improve the transparency of the coating. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0038] Example 1

[0039] A weather-resistant self-cleaning silicone coating is prepared by the following method:

[0040] (1) A hydrogen-containing silicone oil having a viscosity of 400 mPa·s (25° C.) and a hydrogen content of 0.9 wt.% is added to toluene, perfluorooctylethylene and vinyl triethoxysilane, and mixed, and the mixture is heated to 90° C. After nitrogen is used to deoxidize and dehydrate, a catalytic amount of chloroplatinic acid isopropanol solution is added, and the mixture is stirred and reacted for 3 hours until the double bond reaction is complete, and the toluene solvent is removed by vacuum distillation to obtain an alkoxy-modified fluorinated polysiloxane. The hydrogen-containing silicone oil has a molar ratio of 1:0.3:0.3 to perfluorooctylethylene and vinyl triethoxysilane based on the hydrogen content.

[0041] (2) By weight, 80 parts of α,ω-dihydroxypolysiloxane with a viscosity of 3000 mPa·s, 40 parts of alkoxy-modified fluorinated polysiloxane obtained in step (1), 25 parts of methyl MQ silicone resin (M / Q value is 0.75), and 0.02 parts of dibutyltin dilaurate catalyst are added to 150 parts of 120# solvent oil under nitrogen protection and water vapor isolation conditions, stirred and mixed evenly, and sealed and packaged to obtain a weather-resistant self-cleaning silicone coating.

[0042] The hydrophobicity (water contact angle test), adhesion (GB / T 9286-2021), light transmittance and weather resistance of the organic silicon coating obtained in this embodiment (after 60°C, 90% RH, 160h high temperature and humidity treatment and -40°C~100°C for 1h each, 20 cycles of high and low temperature impact treatment, the water contact angle, adhesion and light transmittance were tested again). During the test, the organic silicon coating was applied to the surface of solar photovoltaic glass (thickness 3.2mm, light transmittance 93.6%) and completely cured under standard conditions (temperature 25°C, relative humidity 55%) (the coating design thickness is 5μm). The test results are shown in Table 1 below.

[0043] Table 1

[0044]

[0045] Example 2

[0046] A weather-resistant self-cleaning silicone coating is prepared by the following method:

[0047] (1) A hydrogen-containing silicone oil with a viscosity of 200 mPa·s (25° C.) and a hydrogen content of 1.02 wt.% is added to toluene, perfluorobutylethylene and vinyl triethoxysilane, and mixed evenly. The mixture is heated to 70° C., deoxygenated and dehydrated with nitrogen, and then a catalytic amount of chloroplatinic acid isopropanol solution is added, stirred and reacted for 4 hours until the double bond reaction is complete. The toluene solvent is removed by vacuum distillation to obtain an alkoxy-modified fluorinated polysiloxane. The hydrogen-containing silicone oil has a molar ratio of 1:0.4:0.2 to perfluorooctylethylene and vinyl triethoxysilane based on the hydrogen content.

[0048] (2) By weight, 50 parts of α,ω-dihydroxypolysiloxane with a viscosity of 5000 mPa·s, 50 parts of alkoxy-modified fluorinated polysiloxane obtained in step (1), 20 parts of methyl MQ silicone resin (M / Q value is 0.75), and 0.02 parts of dibutyltin dilaurate catalyst are added to 200 parts of 120# solvent oil under nitrogen protection and water vapor isolation conditions, stirred and mixed evenly, and sealed and packaged to obtain a weather-resistant self-cleaning silicone coating.

[0049] The test results of the hydrophobicity, adhesion, light transmittance and weather resistance of the organic silicon coating obtained in this example are shown in Table 2 below.

[0050] Table 2

[0051]

[0052] Example 3

[0053] A weather-resistant self-cleaning silicone coating is prepared by the following method:

[0054] (1) A hydrogen-containing silicone oil with a viscosity of 800 mPa·s (25° C.) and a hydrogen content of 0.75 wt.% is added to toluene, perfluorooctyl acrylate and vinyl triethoxysilane, and the mixture is mixed. The mixture is heated to 80° C., deoxygenated and dehydrated with nitrogen, and then a catalytic amount of chloroplatinic acid isopropanol solution is added, and the mixture is stirred and reacted for 4 hours until the double bond reaction is complete. The toluene solvent is removed by vacuum distillation to obtain an alkoxy-modified fluorinated polysiloxane. The hydrogen-containing silicone oil has a molar ratio of 1:0.2:0.4 to perfluorooctyl acrylate and vinyl triethoxysilane based on the hydrogen content.

[0055] (2) By weight, 100 parts of α,ω-dihydroxypolysiloxane with a viscosity of 2000 mPa·s, 20 parts of alkoxy-modified fluorinated polysiloxane obtained in step (1), 30 parts of methyl MQ silicone resin (M / Q value is 0.75), and 0.02 parts of dibutyltin dilaurate catalyst are added to 250 parts of 120# solvent oil under nitrogen protection and water vapor isolation conditions, stirred and mixed evenly, and sealed and packaged to obtain a weather-resistant self-cleaning silicone coating.

[0056] The test results of the hydrophobicity, adhesion, light transmittance and weather resistance of the organic silicon coating obtained in this example are shown in Table 3 below.

[0057] Table 3

[0058]

[0059] Example 4

[0060] A weather-resistant self-cleaning organic silicon coating, compared with Example 1, uses an equal amount of hydrogen-containing MQ silicone resin (hydrogen content is 0.12wt.%, M / Q value is 0.75) to replace methyl MQ silicone resin, and the rest is the same.

[0061] The test results of the hydrophobicity, adhesion, light transmittance and weather resistance of the organic silicon coating obtained in this example are shown in Table 4 below.

[0062] Table 4

[0063]

[0064] Example 5

[0065] A weather-resistant self-cleaning organic silicon coating, compared with Example 1, uses an equal amount of vinyl MQ silicone resin (vinyl content of 3.1wt.%, M / Q value of 0.75) to replace methyl MQ silicone resin, and the rest is the same.

[0066] The test results of the hydrophobicity, adhesion, light transmittance and weather resistance of the organic silicon coating obtained in this example are shown in Table 5 below.

[0067] Table 5

[0068]

[0069] Example 6

[0070] A weather-resistant self-cleaning organic silicon coating, compared with Example 1, uses an equal amount of alkoxy-modified MQ silicone resin to replace the methyl MQ silicone resin, and the rest is the same.

[0071] The alkoxy-modified MQ silicone resin is prepared by the following method:

[0072] The hydrogen-containing MQ silicone resin and vinyl triethoxysilane are added to a toluene solvent and mixed evenly, wherein the molar ratio of the vinyl triethoxysilane to the hydrogen content in the hydrogen-containing MQ silicone resin is 0.5:1. The temperature is raised to 85° C., and after deoxygenation and dehydration with nitrogen, a catalytic amount of chloroplatinic acid isopropanol solution is added and stirred to react until the double bond reaction is complete. The solvent is removed by spray drying under reduced pressure to obtain an alkoxy-modified MQ silicone resin.

[0073] Alkoxy modified MQ silicone resins were prepared by using hydrogen-containing MQ silicone resins with a hydrogen content of 0.05wt.%, M / Q value of 0.6 (M / Q-0.6), a hydrogen content of 0.1wt.%, M / Q value of 0.7 (M / Q-0.7), a hydrogen content of 0.2wt.%, M / Q value of 0.9 (M / Q-0.9), a hydrogen content of 0.5wt.%, M / Q value of 1.2 (M / Q-1.2), a hydrogen content of 0.75wt.%, M / Q value of 1.5 (M / Q-1.5), and a hydrogen content of 1.0wt.%, M / Q value of 1.8 (M / Q-1.8). The hydrophobicity, adhesion, light transmittance and weather resistance test results of the obtained silicone coating are shown in Table 6 below.

[0074] Table 6

[0075]

[0076] From the results in Table 6, it can be seen that with the increase of M / Q value, the hydrophobicity and adhesion and weather resistance of the obtained silicone coating show a certain downward trend. The reason is that with the increase of M / Q value, the proportion of Q chain segment core decreases, resulting in a decrease in reinforcement effect; at the same time, the increase in the content of alkoxy cross-linking groups leads to an increase in the cross-linking density of the subsequent alkoxy-modified fluorinated polysiloxane, which inhibits the aggregation and extension of the fluorinated chain on the surface of the coating film, resulting in a decrease in hydrophobicity. At the same time, it can be seen that the light transmittance of the silicone coating obtained with too low M / Q value is significantly reduced. The reason is that the M / Q value is too low and its terminal hydrogen content is low, resulting in a low content of coupling groups for subsequent chemical reactions with α,ω-dihydroxy polysiloxane and alkoxy-modified fluorinated polysiloxane, which reduces the mixing and dispersion effect of MQ silicone resin in the system, thereby resulting in a decrease in light transmittance.

[0077] Comparative Example 1

[0078] A weather-resistant self-cleaning organic silicon coating, compared with Example 1, uses an equal amount of nano silicon dioxide to replace the methyl MQ silicone resin, and the rest is the same.

[0079] The test results of the hydrophobicity, adhesion, light transmittance and weather resistance of the organic silicone coating obtained in this comparative example are shown in Table 7 below.

[0080] Table 7

[0081]

[0082] By comparing the results of this comparative example with those of Example 1, it can be seen that the present invention uses MQ silicone resin instead of silicon dioxide as a reinforcing filler, which can significantly improve the transparency of the coating film.

[0083] Comparative Example 2

[0084] A weather-resistant self-cleaning silicone coating is prepared by the following method:

[0085] (1) Hydrogen-containing silicone oil with a viscosity of 400 mPa·s (25° C.) and a hydrogen content of 0.9 wt.% and perfluorooctylethylene are added to toluene and mixed, the mixture is heated to 90° C., and after nitrogen is used to deoxidize and dehydrate, a catalytic amount of chloroplatinic acid isopropanol solution is added and stirred for 3 hours until the double bond reaction is complete, and the toluene solvent is removed by vacuum distillation to obtain fluorinated polysiloxane. The molar ratio of the hydrogen-containing silicone oil to the perfluorooctylethylene is 1:0.3 based on the hydrogen content.

[0086] (2) By weight, 80 parts of α,ω-dihydroxypolysiloxane with a viscosity of 3000 mPa·s, 40 parts of the fluorinated polysiloxane obtained in step (1) and a vinyl triethoxysilane crosslinker (the amount of the vinyl triethoxysilane crosslinker added is the same as the molar amount of perfluorooctylethyl), 25 parts of methyl MQ silicone resin (M / Q value is 0.75), and 0.02 parts of dibutyltin dilaurate catalyst are added to 150 parts of 120# solvent oil under nitrogen protection and water vapor isolation conditions, stirred and mixed evenly, and sealed and packaged to obtain a weather-resistant self-cleaning silicone coating.

[0087] The test results of the hydrophobicity, adhesion, light transmittance and weather resistance of the silicone coating obtained in this comparative example are shown in Table 8 below.

[0088] Table 8

[0089]

[0090] By comparing the results of this comparative example with Example 1, it can be seen that the present invention can significantly improve the adhesion and transparency of the coating film by pre-alkoxy-modifying the fluorinated polysiloxane and further carrying out dealcoholization condensation chemical crosslinking with α,ω-dihydroxy polysiloxane.

[0091] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A weather-resistant self-cleaning silicone coating, characterized in that: The composition comprises the following components in parts by weight: 50-100 parts of α,ω-dihydroxy polysiloxane; 20-50 parts of alkoxy-modified fluorinated polysiloxane; MQ silicone resin 20-30 parts; Catalyst 0.01~0.05 parts; 100~250 parts of solvent oil; The alkoxy-modified fluorinated polysiloxane is prepared by the following method: The hydrogen-containing silicone oil, the fluorine-containing monomer containing unsaturated double bonds and the silane coupling agent containing unsaturated double bonds are added to an organic solvent and mixed evenly, the temperature is raised to 70-100° C., and after deoxygenation and dehydration with nitrogen, a chloroplatinic acid catalyst solution is added and stirred to react until the unsaturated double bonds react completely, and the organic solvent is removed under reduced pressure to obtain an alkoxy-modified fluorine-containing polysiloxane; The viscosity of the hydrogen-containing silicone oil is 100-1000 mPa·s, and the hydrogen content is 0.3-1.5wt.%; the fluorine-containing monomer containing unsaturated double bonds is perfluoroalkylethylene, perfluoroalkylvinylether or perfluoroalkylacrylate; the silane coupling agent containing unsaturated double bonds is vinyltrimethoxysilane, vinyltriethoxysilane, methacryloxypropyltrimethoxysilane or methacryloxypropyltriethoxysilane; The molar ratio of the hydrogen-containing silicone oil to the fluorine-containing monomer containing an unsaturated double bond and the silane coupling agent containing an unsaturated double bond is 1:0.1-0.5:0.1-0.5 based on the hydrogen content; The MQ silicone resin is methyl MQ silicone resin, hydrogen-containing MQ silicone resin, vinyl MQ silicone resin or alkoxy-modified MQ silicone resin; and the catalyst is dibutyltin dilaurate.

2. A weather-resistant self-cleaning silicone coating according to claim 1, characterized in that: The viscosity of the α,ω-dihydroxy polysiloxane is 1000-10000 mPa·s.

3. The weather-resistant self-cleaning silicone coating according to claim 1, characterized in that: The MQ silicone resin is an alkoxy-modified MQ silicone resin, and the alkoxy-modified MQ silicone resin is prepared by the following method: The hydrogen-containing MQ silicone resin and vinyl triethoxysilane are added to an organic solvent and mixed evenly, and the temperature is raised to 70-100°C. After deoxygenation and dehydration with nitrogen, a chloroplatinic acid catalyst solution is added and stirred to react until the unsaturated double bond reaction is complete. The organic solvent is removed under reduced pressure to obtain an alkoxy-modified MQ silicone resin.

4. A weather-resistant self-cleaning silicone coating according to claim 3, characterized in that: In the preparation of the alkoxy-modified MQ silicone resin, the hydrogen content of the hydrogen-containing MQ silicone resin used is 0.05-1.0 wt.%, and the M / Q value is 0.6-1.

8.

5. The weather-resistant self-cleaning silicone coating according to claim 3, characterized in that: In the preparation of the alkoxy-modified MQ silicone resin, the hydrogen content of the hydrogen-containing MQ silicone resin used is 0.1-0.5 wt.%, and the M / Q value is 0.7-1.

2.

6. The weather-resistant self-cleaning silicone coating according to claim 3, characterized in that: In the preparation of the alkoxy-modified MQ silicone resin, the molar ratio of the vinyl triethoxysilane to the hydrogen content in the hydrogen-containing MQ silicone resin is 0.2-0.8:

1.

7. A method for preparing a weather-resistant self-cleaning silicone coating according to any one of claims 1 to 6, characterized in that: The method comprises the following preparation steps: α,ω-dihydroxy polysiloxane, alkoxy-modified fluorinated polysiloxane, MQ silicone resin and catalyst are added into solvent oil under the condition of isolating water vapor, stirred and mixed evenly, and sealed and packaged to obtain weather-resistant self-cleaning silicone coating.

8. Use of a weather-resistant self-cleaning silicone coating as claimed in any one of claims 1 to 6 in a self-cleaning coating on the surface of a photovoltaic panel.

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