Preparation method of hydrophobic and oleophobic photovoltaic glass

Abstract

The invention discloses a preparation method of hydrophobic and oleophobic photovoltaic glass. The preparation method comprises the following steps: step 1, preparing common photovoltaic glass according to a conventional photovoltaic glass preparation method; 2, a hydrophobic and oleophobic modified epoxy resin coating solution is prepared, and the hydrophobic and oleophobic modified epoxy resin coating solution is prepared from, by mass, 2 parts to 5 parts of thiolactone end-capped fluorinated prepolymers, 15 parts to 16 parts of 4, 4 '-diaminodiphenylmethane, 0.13 part to 0.14 part of base catalysts, 25 parts to 26.5 parts of epoxy resin and the balance tetrahydrofuran solvents; and step 3, preparing the hydrophobic and oleophobic photovoltaic glass, spraying the hydrophobic and oleophobic modified epoxy resin coating solution prepared in the step 2 on the surface of the photovoltaic glass prepared in the step 1, curing and drying to form a hydrophobic and oleophobic layer on the surface of the photovoltaic glass, and preparing the hydrophobic and oleophobic photovoltaic glass. According to the hydrophobic and oleophobic photovoltaic glass provided by the invention, the hydrophobic and oleophobic performance is improved on the premise that the light transmittance is not influenced.

Description

Technical Field

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

[0002] Self-cleaning surface coatings have attracted great attention in the fields of energy and environmental protection, especially in the new energy field, with the solar energy field being the most emphasized. Solar energy is the most ideal choice among renewable energies, 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, since these panels are usually concentratedly laid in open areas to obtain sufficient sunlight, there are often more dusts in open areas due to air convection. Dust usually adheres to the surface of solar panels. When the surface of the panel mainly composed of glass lacks the protection of a coating or the coating fails, the dust will reflect and scatter solar radiation, inhibiting the radiation intensity transmitted to the substrate, thus directly affecting the power generation efficiency. To solve the above technical problems, there is an urgent need for a hydrophobic and oleophobic photovoltaic glass that does not affect the light transmittance to solve the above problems. Summary of the Invention

[0003] By providing a method for preparing a hydrophobic and oleophobic photovoltaic glass in an embodiment of the present application, the problems of poor hydrophobic and oleophobic properties of photovoltaic glass in the prior art are solved, and the beneficial effect of excellent hydrophobic and oleophobic properties without affecting the light transmittance is achieved.

[0004] An embodiment of the present application provides a method for preparing a hydrophobic and oleophobic photovoltaic glass, including the following steps:

[0005] Step 1: Prepare ordinary photovoltaic glass according to the conventional method for preparing photovoltaic glass;

[0006] Step 2: Prepare a hydrophobic and oleophobic modified epoxy resin coating solution, which includes, by mass, 2 - 5 parts of a thioester - capped fluorinated prepolymer, 15 - 16 parts of 4,4'-diaminodiphenylmethane, 0.13 - 0.14 parts of a base catalyst, 25 - 26.5 parts of epoxy resin, and the rest is tetrahydrofuran solvent;

[0007] Step 3: Prepare a hydrophobic and oleophobic photovoltaic glass

[0008] Spray the hydrophobic and oleophobic modified epoxy resin coating solution prepared in Step 2 on the surface of the photovoltaic glass prepared in Step 1, and after curing and drying, form a hydrophobic and oleophobic layer on the surface of the photovoltaic glass to obtain a hydrophobic and oleophobic photovoltaic glass.

[0009] Preferably, the thioester - capped fluorinated prepolymer is preferably 2 - 4.5 parts.

[0010] Preferably, the raw materials of the thionolactone-capped fluorinated prepolymer are: thionolactone acrylamide, fluoroacrylate and photoinitiator. The fluoroacrylate and the thionolactone acrylamide are copolymerized by free radical polymerization under ultraviolet light induction to obtain the thionolactone-capped fluorinated prepolymer. The mass ratio of the fluoroacrylate, the thionolactone acrylamide and the photoinitiator is: 2-3:1:0.07-0.09.

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

[0012] Preferably, the preparation method of the modified epoxy resin coating solution:

[0013] S1: DL-homocysteine thiolactone hydrochloride, NaHCO3 solution and acryloyl chloride are chemically synthesized, diluted, extracted and dried in proportion to obtain thionolactone acrylamide solid. The mass ratio of the DL-homocysteine thiolactone hydrochloride, the NaHCO3 solution and the acryloyl chloride is: 1:1.3-1.5:1.1-1.3;

[0014] S2: The thionolactone acrylamide prepared in S1 is dissolved in a solvent, purified, first added with fluoroacrylate, and then added with a photoinitiator. Under normal temperature conditions, it is reacted and stirred under a 400w LED UV lamp to obtain a thionolactone-capped fluorinated prepolymer solution;

[0015] S3: 4,4'-Diaminodiphenylmethane is dissolved in a tetrahydrofuran solvent, the thionolactone-capped fluorinated prepolymer prepared in S2 and a base catalyst are added, stirred evenly, and then epoxy resin is added and stirred evenly and left standing to obtain a clear modified epoxy resin coating solution. The mass ratio of the 4,4'-diaminodiphenylmethane, the thionolactone-capped 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 the embodiments of the present application has at least the following technical effects or advantages:

[0017] 1. Since the epoxy resin is modified, a hydrophobic and oleophobic modified epoxy resin is prepared. The prepared modified epoxy resin coating solution is evenly sprayed on the photovoltaic glass and dried to obtain a hydrophobic and oleophobic photovoltaic glass, which solves the problem of poor hydrophobic and oleophobic properties of the photovoltaic glass in the prior art, and realizes the beneficial effect of significantly improving the hydrophobic and oleophobic properties without affecting the light transmittance. Detailed implementation mode

[0018] The present application provides a preparation method of a 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 the embodiment of the present application for solving the problem of poor anti-fouling performance of the above-mentioned photovoltaic glass has the following general idea:

[0020] Thiolactone acrylamide is prepared by chemical synthesis. The above-mentioned thiolactone acrylamide fluoride and acrylate are subjected to a free radical polymerization copolymerization chemical reaction under ultraviolet light induction according to a specific ratio to obtain a thiolactone-capped fluorinated prepolymer. The above-mentioned thiolactone-capped fluorinated prepolymer is modified and cured with epoxy resin by a thiol-ring opening reaction according to a ratio to obtain a modified epoxy resin coating solution with excellent hydrophobic and oleophobic effects for standby.

[0021] The photovoltaic glass is prepared according to the conventional photovoltaic glass preparation method, and the prepared modified epoxy resin coating solution is evenly sprayed on the photovoltaic glass, and the hydrophobic and oleophobic photovoltaic glass is obtained after drying.

[0022] In order to better understand the above technical solution, the above technical solution will be described in detail through specific implementation modes below.

[0023] Example 1

[0024] A preparation method of a hydrophobic and oleophobic photovoltaic glass includes the following steps:

[0025] Step 1: Select solar ultra-white embossed glass as the glass substrate, cut, grind the edges, clean the glass substrate, remove dust and pollutants, and blow dry with air.

[0026] Step 2: Pretreatment of the glass surface

[0027] Bisphenol A epoxy resin and polyethylene glycol are mixed according to the conventional preparation method. After obtaining the mixed solution, the glass is preheated to 60 degrees Celsius, and then the mixed solution is coated on the surface of the glass substrate by atomized spraying, and the film thickness is controlled at 1 nanometer.

[0028] Step 3: Coating of the glass substrate

[0029] A suitable coating solution is selected, and the glass coating solution is atomized and evenly sprayed on the glass substrate by ultrasonic atomized spraying method, and the photovoltaic glass is obtained after infrared heating and curing treatment.

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

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

[0032] Then, add 12.65 g (139.8 mmol) of acryloyl chloride and stir at room temperature overnight. After diluting with 200 mL of saturated brine, extract 4 times with ethyl acetate. After drying the organic phase over MgSO4 and filtering, recrystallize to collect the white solid product thioester acrylamide.

[0033] S2. Preparation of thioester-capped fluorinated prepolymer solution: Dissolve 2.01 g (11.7 mmol) of the thioester acrylamide obtained in step S1 in 40 g of acetone, and filter and purify with a 0.22 μm filter membrane; add 5.18 g (10 mmol) of 1H,1H,2H,2H-heptadecafluorodecyl ester and 0.15 g (0.73 mmol) of 184 photoinitiator to the above thioester acrylamide solution, stir for 30 min, and react under a 400 w LED UV lamp at room temperature for 30 min to collect a thioester-capped fluorinated prepolymer solution with a solid content of 20%.

[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 thioester-capped 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, add 1 g (3.3 mmol) of trimethylolpropane triglycidyl ether epoxy resin to the above mixture, let stand for 30 min to obtain a clear solution, and obtain a hydrophobic and oleophobic fluorinated epoxy coating solution.

[0036] Step Five: Preparation of Hydrophobic and Oleophobic Photovoltaic Glass

[0037] Spray the hydrophobic and oleophobic fluorinated epoxy coating solution prepared in step four on the surface of the photovoltaic glass prepared in step three, air-dry the coating and cure it at 90 °C for 30 min, and then cure it at 120 °C for 1.5 h to form a hydrophobic and oleophobic layer on the surface of the photovoltaic glass, and obtain hydrophobic and oleophobic photovoltaic glass.

[0038] After testing, the water contact angle of this hydrophobic and oleophobic photovoltaic glass is 125.6°, the oil contact angle is 65°, the water contact angle hysteresis is 36.8°, the oil contact angle hysteresis is 3°, and the light transmittance is 91.2%.

[0039] Example Two

[0040] Except that the addition amount of the thionolactone-terminated fluorinated prepolymer solution in step S3 of step four in Example 1 was changed from 0.08 g to 0.16 g, the rest was the same as in Example 1.

[0041] After testing, the water contact angle of the hydrophobic and oleophobic photovoltaic glass was 126.8°, the oil contact angle was 65°, the water contact angle hysteresis was 32.5°, the oil contact angle hysteresis was 3°, and the light transmittance was 90.5%.

[0042] From the test results of Examples 1-2, it can be seen that the hydrophobic and oleophobic photovoltaic glass provided by this application significantly has excellent hydrophobicity and oleophobicity, and the light transmittance is not affected either.

Claims

1. A preparation method of a hydrophobic and oleophobic photovoltaic glass, characterized in that, It includes the following steps: Step 1: Prepare ordinary photovoltaic glass according to the conventional preparation method of photovoltaic glass; Step 2: Prepare a hydrophobic and oleophobic modified epoxy resin coating solution, which includes, by mass, 2 - 5 parts of thionolactone - terminated fluorinated prepolymer, 15 - 16 parts of 4,4'-diaminodiphenylmethane, 0.13 - 0.14 parts of base catalyst, 25 - 26.5 parts of epoxy resin, and the rest is tetrahydrofuran solvent; Step 3: Prepare hydrophobic and oleophobic photovoltaic glass, Spray the hydrophobic and oleophobic modified epoxy resin coating solution prepared in Step 2 on the surface of the photovoltaic glass prepared in Step 1. 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.

2. The preparation method of a hydrophobic and oleophobic photovoltaic glass according to claim 1, characterized in that, The thionolactone - terminated fluorinated prepolymer is preferably 2 - 4.5 parts.

3. The preparation method of a hydrophobic and oleophobic photovoltaic glass according to claim 1, characterized in that, The raw materials of the thionolactone - terminated fluorinated prepolymer are: thionolactone acrylamide, fluoroacrylate, and photoinitiator. The fluoroacrylate and the thionolactone acrylamide undergo a radical polymerization copolymerization chemical reaction under ultraviolet light induction to obtain the thionolactone - terminated fluorinated prepolymer. The mass ratio of the fluoroacrylate, the thionolactone acrylamide, and the photoinitiator is: 2 - 3:1:0.07 - 0.

09.

4. The preparation method of a hydrophobic and oleophobic photovoltaic glass according to claim 3, characterized in that, The raw materials of the thionolactone acrylamide are: DL - homocysteine thiolactone hydrochloride, NaHCO3 solution, and acryloyl chloride. The mass ratio of DL - homocysteine thiolactone hydrochloride, the NaHCO3 solution, and the acryloyl chloride is: 1:1.3 - 1.5:1.1 - 1.

3.

5. The preparation method of a hydrophobic and oleophobic photovoltaic glass according to claim 3, characterized in that, The preparation method of the modified epoxy resin coating solution: S1: Chemically synthesize, dilute, extract, and dry DL - homocysteine thiolactone hydrochloride, NaHCO3 solution, and acryloyl chloride in proportion to obtain thionolactone acrylamide solid. The mass ratio of DL - homocysteine thiolactone hydrochloride, the NaHCO3 solution, and the acryloyl chloride is: 1:1.3 - 1.5:1.1 - 1.3; S2: Dissolve the thionolactone acrylamide prepared in S1 in a solvent, purify it, first add fluoroacrylate, and then add a photoinitiator. Under normal temperature conditions, react and stir under a 400w LED UV lamp to obtain a thionolactone - terminated fluorinated prepolymer solution; S3: Dissolve 4,4'-diaminodiphenylmethane in tetrahydrofuran solvent, add the thionolactone - terminated fluorinated prepolymer and base catalyst prepared in S2, stir evenly, then add epoxy resin and stir evenly, and let it stand to obtain a clear modified epoxy resin coating solution. The mass ratio of 4,4'-diaminodiphenylmethane, the thionolactone - terminated fluorinated prepolymer, the base catalyst, and the epoxy resin is: 0.4 - 0.6:0.08 - 0.16:0.005:1.