| abstract |
The present invention is excellent in weatherability that can prevent deterioration of materials accompanying hydrolysis and maintain electrical output characteristics as a solar cell under high temperature and high humidity in the environment actually used as the solar cell module or in the accelerated evaluation of the solar cell module. A battery back sealing sheet is provided. The present invention provides a solar cell backside sealing sheet comprising a laminate in which at least two or more layers of substrates are bonded together with a polyurethane adhesive, wherein the polyurethane adhesive is placed in a HAST chamber, which is a condition evaluation 1: acceleration evaluation device using pressurized steam. Laminate strength after 1 degreeC, 1.05 atm, and 168 hours of storage shall be at least 1 N / 15 mm or more, Condition 2: Delamination after storing in 105 degreeC, 1.05 atm, and 168 hours in the HAST chamber which is an accelerated evaluation apparatus by pressurized steam It is related with the sheet | seat for solar battery back sealing characterized by containing the adhesive agent which has hydrolysis resistance which satisfy | fills that lifting | fever between the base materials accompanying will not arise.n n n n Polyurethane adhesive, laminated body, solar cell back sealing sheet, carbodiimide compound, oxazoline compound, epoxy compound, polyester polyol, isocyanate compound |