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A technology of solar cells and sealing films, applied in circuits, photovoltaic power generation, electrical components, etc., can solve problems such as rust, and achieve the effects of improving durability, preventing corrosion, and high power generation performance
Active Publication Date: 2009-09-23
KYOCERA CORP
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[0008] However, it is known that even such an EVA film, since it contains vinyl acetate as a constituent, tends to be hydrolyzed over time to easily generate acetic acid due to the pe
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Embodiment 1A
[0094] 100 parts by mass of EVA (content of vinyl acetate relative to 100 parts by mass of EVA: 26 parts by mass),
[0095] 1 part by mass of crosslinking agent (2,5-dimethyl-2,5-bis(t-butylperoxy)hexane),
[0096] 2 parts by mass of crosslinking aid (triallyl isocyanurate),
[0097] Acid absorbent (Mg(OH) 2 , average particle size 0.4μm) 0.05 parts by mass,
[0098] Using the above formula, these materials were put into a roller mill, kneaded at 80°C to prepare a resin composition, and the obtained resin composition was rolled and formed at 100°C, and after slow cooling, a sealing film with a thickness of 0.6mm was obtained ( 1A).
Embodiment 1B
[0118] 100 parts by mass of EVA (content of vinyl acetate relative to 100 parts by mass of EVA: 26 parts by mass)
[0119] 1 part by mass of crosslinking agent (2,5-dimethyl-2,5-bis(t-butylperoxy)hexane)
[0120] 2 parts by mass of crosslinking aid (triallyl isocyanurate)
[0121] Acid absorbent (Mg(OH) 2 , average particle size 3μm) 0.5 parts by mass
[0122] Using the above formula, these materials were put into a roller mill, kneaded at 80°C to prepare a resin composition, and the obtained resin composition was rolled and formed at 100°C, and after slow cooling, a sealing film with a thickness of 0.6mm was obtained ( 1B).
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Abstract
Sealing films for solar cells which inhibit the lead wires and electrodes of a solar cell from rusting and thereby enable the solar cell to retain its high power generation performance over a longer period. One of the sealing films is a light-receiving-side sealing film for solar cells which comprises an ethylene/vinyl acetate copolymer, a crosslinking agent, and an acid acceptor. Another is a back-side sealing film for solar cells which comprises an ethylene/vinyl acetate copolymer, a crosslinking agent, and an acid acceptor, wherein the acid acceptor is contained in an amount of 0.5 parts by mass or larger per 100 parts by mass of the ethylene/vinyl acetate copolymer.
Description
technical field [0001] The present invention relates to a sealing film used on the light-receiving side of a solar cell, which contains an ethylene / vinyl acetate copolymer as a main component. Furthermore, this invention relates to the back side sealing film for solar cells which has an ethylene / vinyl acetate copolymer as a main component. Background technique [0002] In recent years, solar cells that directly convert sunlight into electrical energy have been widely used and further developed from the perspectives of efficient use of resources and prevention of environmental pollution. [0003] Solar cells are usually figure 1 As shown, the structure is such that the light-receiving side of the EVA (ethylene / vinyl acetate copolymer) film is interposed between the light-receiving side transparent protection member 1 and the rear side protection member (rear cover) 2 made of a glass substrate or the like. The sealing film 3A and the back side sealing film 3B seal the plural...
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