Polyester film for solar cells and protective film for solar cells containing the same
A technology for solar cells and polyester films, applied in applications, circuits, electronic equipment, etc., can solve the problems of higher thermal shrinkage, lower productivity, higher intrinsic viscosity, etc.
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Embodiment 1
[0120] In a reaction vessel containing 225 parts of ethylene glycol-terephthalic acid oligomers, while stirring the oligomers, the oligomers are kept at 255°C under normal pressure in a nitrogen atmosphere. Speed supply is a slurry prepared by mixing 179 parts of high-purity terephthalic acid and 95 parts of ethylene glycol, distilling off the water and ethylene glycol produced in the reaction to the outside of the system, and it takes 4 hours to esterify the two compounds , The reaction is terminated. The esterification rate at this time is 98% or more, and the degree of polymerization of the produced oligomer is about 5-7.
[0121] 225 parts of the oligomer obtained in the esterification reaction was transferred to the polycondensation reaction tank, and 0.018 parts by weight of tetrabutoxy titanate as a polycondensation catalyst, and 25% ethyl phosphate of trimethyl phosphate as a stabilizer were added. The glycol solution is 0.121 parts by weight. Next, the reaction tempe...
Embodiment 2
[0125] In the same manner as in Example 1, a polyester containing ethylene terephthalate as a main component and diethylene glycol as a copolymerization component was produced. Among them, as the polycondensation catalyst, an ethylene glycol solution with an antimony trioxide concentration of 1.3% was used, and the input amount was set to 4.83 parts by weight. The intrinsic viscosity of the obtained polyester was 0.52 and the copolymerization amount was 1.8 mol%. The subsequent solid phase polymerization was carried out in the same manner as in Example 1 to obtain a polyester having an intrinsic viscosity of 0.70 and a terminal carboxyl group concentration of 13 equivalents / ton. The subsequent film production was also carried out in the same manner as in Example 1.
[0126] In addition, when a durability accelerated test was performed on a solar cell module incorporated as a solar cell back surface protective film, no cracks were observed in the back surface protective film.
Embodiment 3
[0128] Except that the solid phase polymerization conditions were set to 215°C for 22 hours, the same procedure was performed as in Example 1, and a polyester having an intrinsic viscosity of 0.76 and a terminal carboxyl group content of 10 equivalents / ton was obtained. The production of the film was also performed in the same manner as in Example 1. Here, the shrinkage in the lateral direction after heat setting was 5.0%, and the slack rate in the longitudinal direction was 2.6%.
[0129] In addition, when a durability accelerated test was performed on a solar cell module incorporated as a solar cell back surface protective film, no cracks were observed in the back surface protective film.
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