Preparation method of solar cell back film

[0019] Example 1

[0020] First, weigh 30 parts of deionized water, 8 parts of ethyl orthosilicate, 90 parts of absolute ethanol and 2 parts of 5% hydrochloric acid by weight in parts by weight and place them in a beaker. After stirring and mixing evenly, place the beaker Heat in a water bath at 50℃ for 2h, after the water bath is heated, let it stand and cool to room temperature to obtain a silica sol, and then weigh 50 parts by weight of 15% acetic acid solution and 15 parts by weight respectively. Sodium benzene sulfonate and 5 parts of methyltrimethoxysilane were placed in a beaker, heated in a water bath at 50°C for 3 hours, and then allowed to stand and cool to room temperature to prepare a modified gel solution; according to the volume ratio of 1:2, the modified gel was prepared. The mixed gel liquid was stirred and mixed with silica sol and placed under 300W ultrasonic dispersion treatment for 20 minutes to obtain a mixed gel liquid. The mixed gel liquid was vacuum freeze-dr

[0021] Example 2

[0022] First, weigh 25 parts of deionized water, 5 parts of ethyl orthosilicate, 85 parts of absolute ethanol, and 1 part of 5% hydrochloric acid by weight in parts by weight, put them in a beaker, stir and mix evenly, then place the beaker Heated in a water bath at 45℃ for 1h. After the water bath is heated, let it stand and cool to room temperature to obtain a silica sol. Then, in parts by weight, weigh 45 parts by weight of 15% acetic acid solution and 10 parts of dodecane. Sodium benzene sulfonate and 3 parts of methyltrimethoxysilane were placed in a beaker, heated in a water bath at 45°C for 2 hours, and then allowed to stand and cool to room temperature to prepare a modified gel solution; according to the volume ratio of 1:2, the modified gel The mixed gel liquid was stirred and mixed with the silica sol and placed under 200W ultrasonic dispersion treatment for 15 minutes to obtain a mixed gel liquid. The mixed gel liquid was vacuum freeze-dried and placed

[0023] Example 3

[0024] First, weigh 27 parts of deionized water, 6 parts of ethyl orthosilicate, 87 parts of absolute ethanol and 2 parts of 5% hydrochloric acid by weight in parts by weight and place them in a beaker. After stirring and mixing, place the beaker Heat in a water bath at 47°C for 2 hours. After the water bath is heated, let it stand and cool to room temperature to obtain silica sol. Then, by weight, weigh 47 parts of 15% acetic acid solution and 12 parts of dodecane. Sodium benzene sulfonate and 4 parts of methyltrimethoxysilane were placed in a beaker, heated in a water bath at 47°C for 2h, then stood and cooled to room temperature to prepare a modified gel solution; according to the volume ratio of 1:2, change The mixed gel liquid was stirred and mixed with the silica sol and placed under 250W ultrasonic dispersion treatment for 17 minutes to obtain a mixed gel liquid. The mixed gel liquid was vacuum freeze-dried and placed in a ball mill tank, and ball milled at