Polyester resin sheet for solar cell, laminate thereof, solar cell backside protection sheet, and module
A technology for solar cells and polyester resins, applied in the field of solar cells, can solve problems such as use, and achieve the effects of improving hydrolysis resistance, photoelectric conversion efficiency, and excellent hydrolysis resistance.
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Embodiment 1～4
[0153] Mix 64 parts of ethylene glycol with 100 parts of dimethyl terephthalate (parts by weight: hereinafter simply referred to as parts), and then add 0.1 part of zinc acetate and 0.03 part of antimony trioxide as a catalyst, and at the reflux temperature of ethylene glycol, transesterification was carried out.
[0154] 0.08 part of trimethyl phosphate was added there, the temperature was gradually raised, the pressure was reduced, and polymerization was performed at a temperature of 271° C. for 5 hours. The intrinsic viscosity of the obtained polyethylene terephthalate was 0.55. Cut the polymer into sheets with a length of 4 mm. The sheet shape of PET (polyethylene terephthalate) is cylindrical, length: 5.95-8.05 mm, width: 3.20-4.80 mm, height: 1.70-2.30 mm mm, the specific gravity is 1.3g / cm 3 . This PET was placed in a rotary vacuum device (rotary vacuum dryer) with a high polymerization temperature of 190 to 230° C. and a vacuum degree of 0.5 mmHg, and heated while s...
Embodiment 5～7
[0165] Extrude the same PET polymer (number-average molecular weight 21000, intrinsic viscosity 0.71, titanium dioxide particle concentration 14% by weight) with A layer and B layer similarly with the method of embodiment 1~4, be single-layer structure substantially (B layer / A layer / B layer=B layer / B layer / B layer). The addition amount of titanium oxide in single-layer PET was 5% by weight as Sheet-7 (Example 5), 14% by weight as Sheet-8 (Example 6), and 40% by weight as Tablet-7 (Example 5). Sheet-9 (Example 7), three kinds of composite films were produced, and silicon oxide sputtered films were laminated on one side of each sheet in the same manner as in Examples 1 to 4, and these laminated products were respectively referred to as laminated products-7 to Laminates - 9. About other parts, it is the same as that of Examples 1-4.
Embodiment 8～10
[0171] The number average molecular weight of the PET in the B layer is 21000, and the intrinsic viscosity is 0.71, and the number average molecular weight of the PET in the A layer is 18300, and the intrinsic viscosity is 0.55 (both PETs have a titanium dioxide particle concentration of 14% by weight). ). These polymers are laminated by a lamination device to form B layer / A layer / B layer, and are molded into a sheet form by a T-die. The lamination structure is a composite 3-layer structure. The unstretched sheet formed by cooling and solidifying the sheet-shaped molded product discharged from the T-shaped die on a cooling drum with a surface temperature of 25°C is introduced into a roller group heated to 85-98°C, and stretched 3.3 times in the longitudinal direction. Cool with a set of rollers at 21-25°C. Next, the both ends of the longitudinally stretched film were held by clips, introduced into a tenter, and laterally stretched 3.6 times in a direction perpendicular to th...
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Abstract
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