Sheet for sealing rear surface of solar cell

A sheet for sealing a rear surface of a solar cell comprising:

• a laminate in which at least two substrates are attached by a polyurethane-based adhesive, the polyurethane-based adhesive comprising an adhesive having hydrolysis resistance which satisfies the following conditions:
• condition 1:
• the lamination strength of the adhesive is 1 N/15 mm or more after keeping the laminate in a chamber which acts as a highly accelerated stress test system under pressurized steam conditions of 105° C. and 1.05 atm for 168 hours;
• and
• condition 2:
• the adhesive does not bring on a delamination and a blister between the substrates after keeping the laminate in a chamber which acts as a highly accelerated stress test system under pressurized steam conditions of 105° C. and 1.05 atm for 168 hours,
• the polyurethane-based adhesive being an adhesive composition comprising 1 to 50 parts by weight of at least one compound selected from the group consisting of a carbodiimide compound, an oxazoline compound, and an epoxy compound, relative to 100 parts by weight of polyol B and a crosslinking agent, and
• the polyol B being at least one of polycarbonate polyol and polycarbonate urethane polyol of which a chain is elongated by an isocyanate compound having two or greater functional groups.

A sheet for sealing a rear surface of a solar cell comprising:

• a laminate in which at least two substrates are attached by an polyurethane-based adhesive, the polyurethane-based adhesive comprising an adhesive having hydrolysis resistance which satisfies the following conditions:
• condition 1:
• the lamination strength of the adhesive is 1 N/15 mm or more after keeping the laminate in a chamber which acts as a highly accelerated stress test system under pressurized steam conditions of 105° C. and 1.05 atm for 168 hours;
• and
• condition 2:
• the adhesive does not bring on a delamination and a blister between the substrates after keeping the laminate in a chamber which acts as a highly accelerated stress test system under pressurized steam conditions of 105° C. and 1.05 atm for 168 hours,
• the polyurethane-based adhesive being an adhesive composition comprising 1 to 50 parts by weight of at least one compound selected from the group consisting of a carbodiimide compound, an oxazoline compound, and an epoxy compound, relative to 100 parts by weight of polyol C and a crosslinking agent, and
• the polyol C being acrylpolyol in which a hydroxyl group is introduced into a side chain.

A sheet for sealing a rear surface of a solar cell comprising:

• a laminate in which at least two substrates are attached by a polyurethane-based adhesive, the polyurethane-based adhesive comprising an adhesive having hydrolysis resistance which satisfies the following conditions:
• condition 1:
• the lamination strength of the adhesive is 1 N/15 mm or more after keeping the laminate in a chamber which acts as a highly accelerated stress test system under pressurized steam conditions of 105° C. and 1.05 atm for 168 hours;
• and
• condition 2:
• the adhesive does not bring on a delamination and a blister between the substrates after keeping the laminate in a chamber which acts as a highly accelerated stress test system under pressurized steam conditions of 105° C. and 1.05 atm for 168 hours,
• the polyurethane-based adhesive being an adhesive composition comprising 1 to 50 parts by weight of at least one compound selected from the group consisting of a carbodiimide compound, an oxazoline compound, and an epoxy compound, relative to 100 parts by weight of polyol F and a crosslinking agent, and
• the polyol F being at least one of polyether polyol and polyether urethane polyol of which a chain is elongated by an isocyanate compound having two or greater functional groups.

A sheet for sealing a rear surface of a solar cell comprising:

• a laminate in which at least two substrates are attached by a polyurethane-based adhesive, the polyurethane-based adhesive comprising an adhesive having hydrolysis resistance which satisfies the following conditions:
• condition 1:
• the lamination strength of the adhesive is 1 N/15 mm or more after keeping the laminate in a chamber which acts as a highly accelerated stress test system under pressurized steam conditions of 105° C. and 1.05 atm for 168 hours;
• and
• condition 2:
• the adhesive does not bring on a delamination and a blister between the substrates after keeping the laminate in a chamber which acts as a highly accelerated stress test system under pressurized steam conditions of 105° C. and 1.05 atm for 168 hours,
• the polyurethane-based adhesive being an adhesive composition comprising polyol B and a crosslinking agent, and
• the polyol B being at least one of polycarbonate polyol and polycarbonate urethane polyol of which a chain is elongated by an isocyanate compound having two or greater functional groups.

A sheet for sealing a rear surface of a solar cell comprising:

• a laminate in which at least two substrates are attached by a polyurethane-based adhesive, the polyurethane-based adhesive comprising an adhesive having hydrolysis resistance which satisfies the following conditions:
• condition 1:
• the lamination strength of the adhesive is 1 N/15 mm or more after keeping the laminate in a chamber which acts as a highly accelerated stress test system under pressurized steam conditions of 105° C. and 1.05 atm for 168 hours;
• and
• condition 2:
• the adhesive does not bring on a delamination and a blister between the substrates after keeping the laminate in a chamber which acts as a highly accelerated stress test system under pressurized steam conditions of 105° C. and 1.05 atm for 168 hours,
• the polyurethane-based adhesive being an adhesive composition comprising polyol C and a crosslinking agent, and
• the polyol C being acrylpolyol in which a hydroxyl group is introduced into a side chain.

A sheet for sealing a rear surface of a solar cell comprising:

• a laminate in which at least two substrates are attached by a polyurethane-based adhesive, the polyurethane-based adhesive comprising an adhesive having hydrolysis resistance which satisfies the following conditions:
• condition 1:
• the lamination strength of the adhesive is 1 N/15 mm or more after keeping the laminate in a chamber which acts as a highly accelerated stress test system under pressurized steam conditions of 105° C. and 1.05 atm for 168 hours;
• and
• condition 2:
• the adhesive does not bring on a delamination and a blister between the substrates after keeping the laminate in a chamber which acts as a highly accelerated stress test system under pressurized steam conditions of 105° C. and 1.05 atm for 168 hours,
• the polyurethane-based adhesive being an adhesive composition comprising polyol D and a crosslinking agent,
• the polyol D comprising 1 to 50% by weight of polyol A, and 50 to 99% by weight of at least one of polyol B and polyol C,
• the polyol A being at least one of polyester polyol and polyester urethane polyol of which a chain is elongated by an isocyanate compound having two or greater functional groups,
• the polyol B being at least one of polycarbonate polyol and polycarbonate urethane polyol of which a chain is elongated by an isocyanate compound having two or greater functional groups, and
• the polyol C being acrylpolyol in which a hydroxyl group is introduced into a side chain.

A sheet for sealing a rear surface of a solar cell comprising:

• a laminate in which at least two substrates are attached by an polyurethane-based adhesive, the polyurethane-based adhesive comprising an adhesive having hydrolysis resistance which satisfies the following conditions:
• condition 1:
• the lamination strength of the adhesive is 1 N/15 mm or more after keeping the laminate in a chamber which acts as a highly accelerated stress test system under pressurized steam conditions of 105° C. and 1.05 atm for 168 hours;
• and
• condition 2:
• the adhesive does not bring on a delamination and a blister between the substrates after keeping the laminate in a chamber which acts as a highly accelerated stress test system under pressurized steam conditions of 105° C. and 1.05 atm for 168 hours,
• the polyurethane-based adhesive being an adhesive composition comprising polyol E and a crosslinking agent,
• the polyol E being a polyol copolymer in which 1 to 50% by weight of polyol A, and 50 to 99% by weight of at least one of polyol B and polyol C is subjected to a chain elongation reaction with an isocyanate compound having two or more functional groups,
• the polyol A being at least one of polyester polyol and polyester urethane polyol of which a chain is elongated by an isocyanate compound having two or greater functional groups,
• the polyol B being at least one of polycarbonate polyol and polycarbonate urethane polyol of which a chain is elongated by an isocyanate compound having two or greater functional groups, and
• the polyol C is acrylpolyol in which a hydroxyl group is introduced into a side chain.