SHEET FOR SEALING REAR SURFACE OF SOLAR CELL

摘要

There is provided a solar cell back surface sealing sheet which prevents a material degradation due to hydrolysis in an actual environment in which i t is used as a solar cell module and in a high temperature and humidity acce leration test of a solar cell module. The sheet also maintains electrical ou tput characteristics as a solar cell, and excels in antiweatherability. The solar cell back surface sealing sheet has a laminated body formed by laminat ing at least two or more layers of a base material with a polyurethane adhes ive, wherein the polyurethane adhesive includes an adhesive with hydrolysis resistance satisfying the following two conditions; condition (1), wherein l aminate strength after storing in a HAST chamber, which is an acceleration t est equipment by pressurized steam, for 168 hours at 105øC and 1.05 atm is a t least 1N/15mm or more, and condition (2), wherein separation between the s ubstrates due to delamination does not occur after storing in a HAST chamber , which is an acceleration test equipment by pressurized steam, for 168 hour s at 105øC and 1.05 atm.