Solar cell back plate, preparation method of same and solar cell component

[0041] Example 1

[0042] (1) Preparation of fluorine-containing coatings: 100 parts by weight of tetrafluoroethylene copolymer (Daikin Industry Co., Ltd., Zeffle GK570, solid content 65wt%), 30 parts by weight of titanium dioxide (DuPont, R706), 10 parts by weight of acetic acid After the butyl ester was pre-mixed under stirring, 150 parts by weight of 0.20 mm zirconia beads were added, and the pigment dispersant was used to disperse at a speed of 3000 rpm for 30 minutes. Then, the zirconia beads were filtered out with a 200-mesh sieve, and 10 parts by weight of an isocyanate curing agent (Bayer, N3390) was added to obtain the white fluorine-containing paint of this embodiment.

[0043] (2) Preparation of polyurethane coating: 100 parts by weight of polyester resin (Toyobo, 680 resin) was dissolved in 300 parts by weight of ethyl acetate, and then 10 parts by weight of isocyanate curing agent (Bayer, N3390) was added to obtain this Examples of polyurethane coatings.

[0044] (3) Preparation of moisture and heat resistant film: 100 parts by weight of EVA (VA content 12wt%, Korea Hyundai EF443) and 48 parts by weight of titanium dioxide (DuPont R960) were blended and granulated, and then mixed with 500 parts by weight of polyethylene PE and 1 weight part A stabilizer (Taiwan Double Bond, CHISORB770) was blended and extruded into a film to obtain a heat and humidity resistant film with a film thickness of 100 μm.

[0045] (4) Backsheet molding: Corona treatment is performed on the insulating substrate PET film (Jiangsu Yuxing Film Technology Co., Ltd., CY11) with a thickness of 120 μm, and then the polyurethane coating in step (2) is coated on one surface of the PET film, After curing, a polyurethane coating with a thickness of 5 μm is formed on the surface of the PET, and then the fluorine-containing coating in step (1) is coated on the polyurethane coating, and a cured coating of fluorine-containing polymer coating with a thickness of 25 μm is formed after curing. Coat the other surface of the PET film with DIC adhesive (main agent TSB-500C/curing agent TSH-901C=10/1 solution) to form a coating amount of 10g/m 2 , an adhesive layer with a thickness of 9 μm, and finally attach the moisture-resistant film in step (3) to obtain the solar cell backsheet of this embodiment, denoted as S1, with figure 2 structure shown.

[0058] Example 2

[0059] The same steps as in Example 1 were used to prepare the solar cell backsheet S2 of this example, the difference being that:

[0060] In step (3), the amount of EVA used is 300 parts by weight, wherein the content of VA is 5 wt%.

[0061] Example 3

[0062] The same steps as in Example 1 were used to prepare the solar cell backsheet S3 of this example, the difference being that:

[0063] In step (2), 0.5 parts by weight of carbodiimide and 1.0 parts by weight of fumed silica are also added to the polyurethane coating.