BACK SHEET FOR SOLAR CELLS

Disclosed is a back sheet for solar cells which does not use a generally used PET film, has excellent weather resistance, workability, and process economic property, and when being manufactured as coextrusion sheets, completely solves a separation problem caused by deterioration of an interlayer cou...

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Bibliographische Detailangaben
Hauptverfasser:	CHO, JIN JU, KIM, EUN JIN, YOON, SUNG TAEK
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	BASIC ELECTRIC ELEMENTS ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRICITY GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM PERFORMING OPERATIONS REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION SEMICONDUCTOR DEVICES TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TRANSPORTING
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Beschreibung
Zusammenfassung:	Disclosed is a back sheet for solar cells which does not use a generally used PET film, has excellent weather resistance, workability, and process economic property, and when being manufactured as coextrusion sheets, completely solves a separation problem caused by deterioration of an interlayer coupling force. The present invention comprises: an outer layer which contains a weather resistant olefin resin; a middle layer which contains olefin resins to be directly laminated with the outer layer; and an inner layer which contains a mixture comprising 20-70 wt% of polyethylene (PE) or ethylene vinyl acetate (EVA), and 30-80 wt% of high functional olefin resins (modified PP) or universal poly propylene (PP) in order to be directly laminated with the middle layer and at the same time laminated with EVA encapsulant on an opposite surface. 종래 일반적으로 사용되던 PET 필름을 사용하지 않으면서도 내후성, 가공성 및 공정 경제성이 우수하며, 특히 공압출 시트로 제조 시 층간 결합력 저하로 인한 박리 문제를 완벽히 해결할 수 있는 태양전지용 백 시트가 개시된다. 본 발명은 내후성 올레핀 수지(Weather-resistant PP)를 포함하는 외층; 상기 외층과 직접 합지되도록 올레핀 수지를 포함하는 중간층; 및 상기 중간층과 직접 합지됨과 동시에 반대면에는 에틸렌비닐아세테이트(EVA) 봉지제가 합지되도록 폴리에틸렌(PE) 또는 에틸렌비닐아세테이트(EVA) 수지 20~70중량%와 고기능성 올레핀 수지(Modified PP) 또는 범용 폴리프로필렌(PP) 30~80중량%가 혼합된 혼합물을 포함하는 내층;을 포함하는 태양전지용 백 시트를 제공한다.