White polyester film and method for manufacturing same, solar cell back sheet, and solar cell module
a technology of white polyester film and solar cell, which is applied in the direction of photovoltaic energy generation, electrical equipment, semiconductor devices, etc., can solve the problems of reducing the adhesion, cleaving and peeling of polyester films, and difficult to obtain sufficient adhesion, etc., to achieve excellent adhesion, excellent weather resistance, and high power generation efficiency
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[0273]1>
[0274]As described below, terephthalic acid and ethylene glycol were directly reacted with each other so as to distill water away and were esterified, and a polyester resin (Ti catalyst-based PET) was obtained using a direct esterification method in which polycondensation was carried out at a reduced pressure and a continuous polymerization device.
[0275](1) Esterification Reaction
[0276]In a first esterification reaction tank, highly pure terephthalic acid (4.7 ton) and ethylene glycol (1.8 ton) were mixed together for 90 minutes so as to form a slurry, and the slurry was continuously supplied to the first esterification reaction tank at a flow rate of 3,800 kg / h. Furthermore, an ethylene glycol solution of a citric acid chelate titanium complex (VERTEC AC-420, manufactured by Johnson Matthey) in which citric acid coordinated Ti metal was continuously supplied, and a reaction was caused under stirring at an inner temperature of the reaction tank of 250° C. for an average resi...
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