A method for preparing hydrophobic and oleophobic photovoltaic glass

Abstract

This invention discloses a method for preparing hydrophobic and oleophobic photovoltaic glass, comprising the following steps: Step 1: Preparing ordinary photovoltaic glass according to conventional photovoltaic glass preparation methods; Step 2: Preparing a hydrophobic and oleophobic modified epoxy resin coating solution, wherein the hydrophobic and oleophobic modified epoxy resin coating solution comprises, by weight, 2-5 parts of thiolactone-terminated fluorinated prepolymer, 15-16 parts of 4,4'-diaminodiphenylmethane, 0.13-0.14 parts of alkaline catalyst, 25-26.5 parts of epoxy resin, and the remainder being tetrahydrofuran solvent; Step 3: Preparing the hydrophobic and oleophobic photovoltaic glass by spraying the hydrophobic and oleophobic modified epoxy resin coating solution obtained in Step 2 onto the surface of the photovoltaic glass obtained in Step 1, and after curing and drying, forming a hydrophobic and oleophobic layer on the surface of the photovoltaic glass, thereby obtaining the hydrophobic and oleophobic photovoltaic glass. The hydrophobic and oleophobic photovoltaic glass provided by this invention achieves improved hydrophobic and oleophobic properties without affecting light transmittance.

Description

Technical Field

[0001] This invention relates to the technical field of coating applications, and more particularly to a method for preparing hydrophobic and oleophobic photovoltaic glass. Background Technology

[0002] Self-cleaning surface coatings have attracted significant attention in the energy and environmental protection fields, particularly in the new energy sector, especially solar energy. Solar energy is the most ideal renewable energy source, being clean, safe, and inexhaustible. In recent years, with the booming development of the new energy industry, the proportion of the solar energy industry has been increasing year by year. The most common method of utilizing solar energy resources is solar panels. However, these panels are usually concentrated in open areas to obtain sufficient sunlight, where air convection often leads to a large amount of dust. Dust typically adheres to the surface of solar panels, and when the surface of glass-based panels lacks protective coatings or the coatings fail, the dust reflects and scatters solar radiation, inhibiting the radiation intensity transmitted to the substrate, thus directly affecting power generation efficiency. To address these technical problems, there is an urgent need for a hydrophobic and oleophobic photovoltaic glass that does not affect light transmittance. Summary of the Invention

[0003] This application provides a method for preparing hydrophobic and oleophobic photovoltaic glass, which solves the problem of poor hydrophobic and oleophobic properties of photovoltaic glass in the prior art, and achieves the beneficial effect of excellent hydrophobic and oleophobic properties without affecting light transmittance.

[0004] This application provides a method for preparing hydrophobic and oleophobic photovoltaic glass, comprising the following steps:

[0005] Step 1: Prepare ordinary photovoltaic glass according to conventional photovoltaic glass preparation methods;

[0006] Step 2: Prepare a hydrophobic and oleophobic modified epoxy resin coating solution, wherein the hydrophobic and oleophobic modified epoxy resin coating solution comprises, by weight, 2-5 parts of thiolactone-terminated fluorinated prepolymer, 15-16 parts of 4,4'-diaminodiphenylmethane, 0.13-0.14 parts of alkaline catalyst, 25-26.5 parts of epoxy resin, and the remainder being tetrahydrofuran solvent;

[0007] Step 3: Fabrication of hydrophobic and oleophobic photovoltaic glass

[0008] The hydrophobic and oleophobic modified epoxy resin coating solution obtained in step two is sprayed onto the surface of the photovoltaic glass obtained in step one. After curing and drying, a hydrophobic and oleophobic layer is formed on the surface of the photovoltaic glass, thus obtaining hydrophobic and oleophobic photovoltaic glass.

[0009] Preferably, the thiolactone-terminated fluorinated prepolymer is 2-4.5 parts.

[0010] Preferably, the raw materials for the thiolactone-terminated fluorinated prepolymer are: thiolactone acrylamide, fluoroacrylate, and photoinitiator. The fluoroacrylate and the thiolactone acrylamide are subjected to a free radical polymerization copolymerization reaction under ultraviolet light to obtain the thiolactone-terminated fluorinated prepolymer. The mass ratio of the fluoroacrylate, the thiolactone acrylamide, and the photoinitiator is 2-3:1:0.07-0.09.

[0011] Preferably, the raw materials for the thiolactone acrylamide are: DL-homocysteine ​​thiolactone hydrochloride, NaHCO3 solution and acryloyl chloride, wherein the mass ratio of DL-homocysteine ​​thiolactone hydrochloride, NaHCO3 solution and acryloyl chloride is 1:1.3-1.5:1.1-1.3;

[0012] Preferably, the method for preparing the modified epoxy resin coating solution is as follows:

[0013] S1: Thiolactone acrylamide solid was prepared by synthesizing, diluting, extracting, and drying DL-homocysteine ​​thiolactone hydrochloride, NaHCO3 solution, and acryloyl chloride in a certain proportion. The mass ratio of DL-homocysteine ​​thiolactone hydrochloride, NaHCO3 solution, and acryloyl chloride was 1:1.3-1.5:1.1-1.3.

[0014] S2: The thiolactone acrylamide obtained in S1 is dissolved in a solvent and purified. Fluorinated acrylate is added first, then a photoinitiator is added. The reaction is carried out under a 400W LED UV lamp at room temperature and stirred to obtain a thiolactone-terminated fluorinated prepolymer solution.

[0015] S3: Dissolve 4,4'-diaminodiphenylmethane in tetrahydrofuran solvent, add the thiolactone-terminated fluorinated prepolymer and base catalyst prepared in S2, stir evenly, add epoxy resin, stir evenly, and let stand to obtain a clear modified epoxy resin coating solution. The mass ratio of 4,4'-diaminodiphenylmethane, the thiolactone-terminated fluorinated prepolymer, the base catalyst and the epoxy resin is 0.4~0.6:0.08~0.16:0.005:1.

[0016] One technical solution provided in this application embodiment has at least the following technical effects or advantages:

[0017] 1. By modifying epoxy resin, a hydrophobic and oleophobic modified epoxy resin was prepared. The modified epoxy resin coating solution prepared above was uniformly sprayed onto photovoltaic glass and dried to obtain hydrophobic and oleophobic photovoltaic glass. This solves the problem of poor hydrophobic and oleophobic properties of photovoltaic glass in the prior art and achieves the beneficial effect of significantly improving hydrophobic and oleophobic properties without affecting light transmittance. Detailed Implementation

[0018] This application provides a method for preparing hydrophobic and oleophobic photovoltaic glass, which solves the problem of poor anti-fouling performance of photovoltaic glass in the prior art.

[0019] The technical solution in this application embodiment is to solve the problem of poor anti-fouling performance of photovoltaic glass. The overall approach is as follows:

[0020] Thiolactone acrylamide was prepared by chemical synthesis. The fluorinated thiolactone acrylamide and acrylate were copolymerized with free radical under ultraviolet light in a specific ratio to obtain a thiolactone-terminated fluorinated prepolymer. The thiolactone-terminated fluorinated prepolymer was then modified with epoxy resin by a thiol-ring-opening reaction in a specific ratio to obtain a modified epoxy resin coating solution with excellent hydrophobic and oleophobic properties, which was kept for later use.

[0021] Photovoltaic glass was prepared according to conventional photovoltaic glass preparation methods. The modified epoxy resin coating solution prepared above was uniformly sprayed onto the photovoltaic glass and dried to obtain hydrophobic and oleophobic photovoltaic glass.

[0022] To better understand the above technical solution, the following will provide a detailed explanation of the technical solution through specific implementation methods.

[0023] Example 1

[0024] A method for preparing hydrophobic and oleophobic photovoltaic glass includes the following steps:

[0025] Step 1: Select solar ultra-clear patterned glass as the glass substrate, cut, grind, and clean the glass substrate to remove dust and contaminants, and then blow it dry.

[0026] Step 2: Pretreatment of the glass surface

[0027] Bisphenol A epoxy resin and polyethylene glycol were mixed according to conventional preparation methods to obtain a mixed solution. After the glass was preheated to 60 degrees Celsius, the mixed solution was coated on the surface of the glass substrate using an atomization spraying method, and the film thickness was controlled to be 1 nanometer.

[0028] Step 3: Coating the glass substrate

[0029] A suitable coating solution is selected, and an ultrasonic atomization spraying method is used to uniformly spray the glass coating solution onto the glass substrate. After infrared heating and curing treatment, photovoltaic glass is obtained.

[0030] Step 4: Preparation of modified hydrophobic and oleophobic solutions

[0031] S1. Preparation of thiolactone acrylamide: 11.42 g (74.3 mmol) of DL-homocysteine ​​thiolactone hydrochloride was dissolved in 200 mL of NaHCO3 solution (16 g NaHCO3, water / dioxane, volume 1:1) and stirred at 0 °C for 30 min.

[0032] Then, 12.65 g (139.8 mmol) of acryloyl chloride was added, and the mixture was stirred overnight at room temperature. After dilution with 200 mL of saturated brine, the mixture was extracted four times with ethyl acetate. The organic phase was dried over MgSO4, filtered, and recrystallized to collect the white solid product, thiolactone acrylamide.

[0033] S2. Preparation of the thiolactone-terminated fluorinated prepolymer solution: 2.01 g (11.7 mmol) of the thiolactone acrylamide obtained in step S1 was dissolved in 40 g of acetone and purified by filtration through a 0.22 μm filter membrane; 5.18 g (10 mmol) of 1H,1H,2H,2H-heptadecyl ester and 0.15 g (0.73 mmol) of 184 photoinitiator were added to the above thiolactone acrylamide solution, stirred for 30 min, and reacted under a 400 W LED UV lamp at room temperature for 30 min. The thiolactone-terminated fluorinated prepolymer solution with a solid content of 20% was collected.

[0034] S3. Dissolve 0.58 g (2.8 mmol) of 4,4'-diaminodiphenylmethane in 2 g of tetrahydrofuran, then add 0.08 g of the thiolactone-terminated fluorinated prepolymer solution prepared in step S2 and 5 μL of 1,8-diazabicyclo[5.4.0]undec-7-ene, and stir at room temperature for 30 min.

[0035] Then, 1 g (3.3 mmol) of trimethylolpropane triglycidyl ether epoxy resin was added to the above mixture, and the mixture was allowed to stand for 30 min to obtain a clear solution, which yielded a hydrophobic and oleophobic fluorinated epoxy coating solution.

[0036] Step 5: Fabrication of hydrophobic and oleophobic photovoltaic glass

[0037] The hydrophobic and oleophobic fluorinated epoxy coating solution obtained in step four is sprayed onto the surface of the photovoltaic glass obtained in step three. The air-dried coating is cured at 90°C for 30 minutes and then cured at 120°C for 1.5 hours to form a hydrophobic and oleophobic layer on the surface of the photovoltaic glass, thus obtaining the hydrophobic and oleophobic photovoltaic glass.

[0038] Tests showed that the hydrophobic and oleophobic photovoltaic glass has a water contact angle of 125.6°, an oil contact angle of 65°, a water contact angle hysteresis of 36.8°, an oil contact angle hysteresis of 3°, and a light transmittance of 91.2%.

[0039] Example 2

[0040] Except for step S3 in step four of Example 1, where the amount of thiolactone-terminated fluorinated prepolymer solution added is changed from 0.08g to 0.16g, the rest is the same as in Example 1.

[0041] Tests showed that the hydrophobic and oleophobic photovoltaic glass has a water contact angle of 126.8°, an oil contact angle of 65°, a water contact angle hysteresis of 32.5°, an oil contact angle hysteresis of 3°, and a light transmittance of 90.5%.

[0042] As can be seen from the test results of Examples 1-2, the hydrophobic and oleophobic photovoltaic glass provided in this application has excellent hydrophobicity and oleophobicity, and the light transmittance is not affected.

Claims

1. A method for preparing hydrophobic and oleophobic photovoltaic glass, characterized in that, Includes the following steps: Step 1: Prepare ordinary photovoltaic glass according to conventional photovoltaic glass preparation methods; Step 2: Prepare a hydrophobic and oleophobic modified epoxy resin coating solution, wherein the hydrophobic and oleophobic modified epoxy resin coating solution comprises, by weight, 2-4.5 parts of thiolactone-terminated fluorinated prepolymer, 15-16 parts of 4,4'-diaminodiphenylmethane, 0.13-0.14 parts of alkaline catalyst, 25-26.5 parts of trimethylolpropane triglycidyl ether epoxy resin, and the remainder being tetrahydrofuran solvent; Step 3: Fabrication of hydrophobic and oleophobic photovoltaic glass. The hydrophobic and oleophobic modified epoxy resin coating solution obtained in step two is sprayed onto the surface of the photovoltaic glass obtained in step one. After curing and drying, a hydrophobic and oleophobic layer is formed on the surface of the photovoltaic glass to obtain hydrophobic and oleophobic photovoltaic glass. The raw materials for the thiolactone-terminated fluorinated prepolymer are: thiolactone acrylamide, fluoroacrylate, and photoinitiator. The fluoroacrylate and the thiolactone acrylamide are subjected to a free radical polymerization copolymerization reaction under ultraviolet light to obtain the thiolactone-terminated fluorinated prepolymer. The mass ratio of the fluoroacrylate, the thiolactone acrylamide, and the photoinitiator is 2-3:1:0.07-0.

09. The raw materials for the thiolactone acrylamide are: DL-homocysteine ​​thiolactone hydrochloride, NaHCO3 solution and acryloyl chloride, wherein the mass ratio of DL-homocysteine ​​thiolactone hydrochloride, NaHCO3 solution and acryloyl chloride is 1:1.3-1.5:1.1-1.

3.

2. The method for preparing a hydrophobic and oleophobic photovoltaic glass as described in claim 1, characterized in that, The preparation method of the modified epoxy resin coating solution: S1: Thiolactone acrylamide solid was prepared by synthesizing, diluting, extracting and drying DL-homocysteine ​​thiolactone hydrochloride, NaHCO3 solution and acryloyl chloride in a certain proportion. S2: The thiolactone acrylamide obtained in S1 is dissolved in a solvent and purified. Fluorinated acrylate is added first, then a photoinitiator is added. The reaction is carried out under a 400W LED UV lamp at room temperature and stirred to obtain a thiolactone-terminated fluorinated prepolymer solution. S3: Dissolve 4,4'-diaminodiphenylmethane in tetrahydrofuran solvent, add the thiolactone-terminated fluorinated prepolymer and alkali catalyst obtained in S2, stir evenly, add epoxy resin, stir evenly, and let stand to obtain a clear modified epoxy resin coating solution; the mass ratio of 4,4'-diaminodiphenylmethane, the thiolactone-terminated fluorinated prepolymer, the alkali catalyst and the epoxy resin is 0.4-0.6:0.08-0.16:0.005:1.