Sealing material for solar cell, sheet for solar-cell sealing, and solar cell module employing these

Abstract

To provide a sealing material for solar cells which comprises olefin (co)polymers and is excellent in flexibility, stress-absorbing ability, transparency, low-temperature impact strength, etc. and the crosslinking of which can be omitted according to need to improve productivity. [MEANS FOR SOLVING PROBLEMS] The sealing material for solar cells comprises 1-40 parts by weight of polypropylene (i) having a propylene unit content of 90 mol% or higher and 60-99 parts by weight of a propylene / ethylene copolymer (ii) comprising 45-90 mol% propylene units, 10-25 mol% ethylene units, and 0-30 mol% units (a) derived from a C4-20 a-olefin ((i)+(ii)=100 parts by weight). It further contains an ethylene / a-olefin copolymer (B) in an amount of 5-95 parts by weight per 95-5 parts by weight of the sum of(i) and (ii) ((i)+(ii)+(B)=100 parts by weight).

Description

technical field The present invention relates to a solar cell sealing material for insulating a solar cell element from external air, and more specifically, to a solar cell sealing material excellent in flexibility, stress absorbing ability, transparency, low-temperature impact resistance, and the like. The present invention is also preferably used for a solar cell sealing sheet using the solar cell sealing material, and a solar cell module using the sealing material and / or sealing sheet. Background technique As global environmental problems and energy problems become more and more serious, solar cells are attracting attention as a clean and inexhaustible energy source. When solar cells are used outdoors such as on roofs of buildings, they are usually used in the form of solar cell modules. A solar cell module generally has a structure in which solar cell units (cells) made of polysilicon or the like are sandwiched between solar cell sealing materials made of soft transpa...

AI Technical Summary

Problems solved by technology

However, Patent Document 2 does not disclose any information about the type or use form of the olefin-based (co)polymer used to obtain desirable properties (flexibility, stress absorbing ability, transparency, low-temperature impact resistance, etc.) as a sealing material. specific tips