KR20210029365A - A composite adhesive film for photovoltaic cell - Google Patents
A composite adhesive film for photovoltaic cell Download PDFInfo
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- KR20210029365A KR20210029365A KR1020190110480A KR20190110480A KR20210029365A KR 20210029365 A KR20210029365 A KR 20210029365A KR 1020190110480 A KR1020190110480 A KR 1020190110480A KR 20190110480 A KR20190110480 A KR 20190110480A KR 20210029365 A KR20210029365 A KR 20210029365A
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- adhesive film
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- ethylene
- eva
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- 239000002313 adhesive film Substances 0.000 title claims abstract description 56
- 239000002131 composite material Substances 0.000 title claims abstract description 15
- -1 carbodiimide compound Chemical class 0.000 claims abstract description 30
- 239000000203 mixture Substances 0.000 claims abstract description 28
- 239000004711 α-olefin Substances 0.000 claims abstract description 24
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims abstract description 22
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 12
- 239000004611 light stabiliser Substances 0.000 claims abstract description 10
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 4
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 4
- MMCOUVMKNAHQOY-UHFFFAOYSA-L oxido carbonate Chemical group [O-]OC([O-])=O MMCOUVMKNAHQOY-UHFFFAOYSA-L 0.000 claims description 3
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 claims 1
- 125000003386 piperidinyl group Chemical group 0.000 abstract 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 23
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 23
- 238000004383 yellowing Methods 0.000 description 9
- 238000003490 calendering Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 5
- 229940116351 sebacate Drugs 0.000 description 5
- CXMXRPHRNRROMY-UHFFFAOYSA-L sebacate(2-) Chemical compound [O-]C(=O)CCCCCCCCC([O-])=O CXMXRPHRNRROMY-UHFFFAOYSA-L 0.000 description 5
- BRQMAAFGEXNUOL-UHFFFAOYSA-N 2-ethylhexyl (2-methylpropan-2-yl)oxy carbonate Chemical compound CCCCC(CC)COC(=O)OOC(C)(C)C BRQMAAFGEXNUOL-UHFFFAOYSA-N 0.000 description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 4
- 239000005977 Ethylene Substances 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 150000001451 organic peroxides Chemical class 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 2
- CRSBERNSMYQZNG-UHFFFAOYSA-N 1-dodecene Chemical compound CCCCCCCCCCC=C CRSBERNSMYQZNG-UHFFFAOYSA-N 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 2
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 2
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 2
- IAQRGUVFOMOMEM-UHFFFAOYSA-N but-2-ene Chemical compound CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 2
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 150000001718 carbodiimides Chemical class 0.000 description 2
- 238000007334 copolymerization reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- PKXHXOTZMFCXSH-UHFFFAOYSA-N 3,3-dimethylbut-1-ene Chemical compound CC(C)(C)C=C PKXHXOTZMFCXSH-UHFFFAOYSA-N 0.000 description 1
- YHQXBTXEYZIYOV-UHFFFAOYSA-N 3-methylbut-1-ene Chemical compound CC(C)C=C YHQXBTXEYZIYOV-UHFFFAOYSA-N 0.000 description 1
- LDTAOIUHUHHCMU-UHFFFAOYSA-N 3-methylpent-1-ene Chemical compound CCC(C)C=C LDTAOIUHUHHCMU-UHFFFAOYSA-N 0.000 description 1
- 229920002799 BoPET Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Chemical group CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000012986 chain transfer agent Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 125000002704 decyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- XNMQEEKYCVKGBD-UHFFFAOYSA-N dimethylacetylene Natural products CC#CC XNMQEEKYCVKGBD-UHFFFAOYSA-N 0.000 description 1
- 229940069096 dodecene Drugs 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 125000001972 isopentyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 125000002960 margaryl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
- 150000003682 vanadium compounds Chemical class 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/387—Block-copolymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J123/04—Homopolymers or copolymers of ethene
- C09J123/08—Copolymers of ethene
- C09J123/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C09J123/0853—Vinylacetate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/048—Encapsulation of modules
- H01L31/0481—Encapsulation of modules characterised by the composition of the encapsulation material
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/322—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of solar panels
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
- Photovoltaic Devices (AREA)
Abstract
Description
본 발명은 에틸렌-α-올레핀 공중합체 및 에틸렌-비닐 아세테이트 공중합체 (EVA)의 블렌드를 기반으로 하는 광전지(photovoltaic cell)용 복합 접착제 필름, 및 상기 접착제 필름을 사용하여 밀봉된 광전지에 관한 것이다.The present invention relates to a composite adhesive film for a photovoltaic cell based on a blend of an ethylene-α-olefin copolymer and an ethylene-vinyl acetate copolymer (EVA), and a photovoltaic cell sealed using the adhesive film.
금세기의 시작 시, 화석 연료를 대체하기 위한 재생가능한 대체 에너지 공급원으로서, 태양 에너지가 대폭적인 주목을 받았다. 특히, 최근 수년 내에, 환경 보호 목적으로 제조된 광전지 조립체는 다양한 분야에서 급속하게 퍼졌다.At the beginning of this century, solar energy received great attention as a renewable alternative energy source to replace fossil fuels. In particular, in recent years, photovoltaic assemblies manufactured for environmental protection purposes have spread rapidly in various fields.
광전지는 통상적으로, 유리 기판 표면 투명 보호 부재, 광전지용 표면측 접착제 필름, 광전지 유닛, 예컨대 실리콘 전력 발생 요소, 광전지용 후면측 접착제 필름 및 후면측 보호 부재를 순차적으로 적층함으로써 제조된다.Photovoltaic cells are typically manufactured by sequentially laminating a glass substrate surface transparent protective member, a surface side adhesive film for a photovoltaic cell, a photovoltaic unit such as a silicon power generating element, a backside adhesive film for a photovoltaic cell, and a backside protective member.
이러한 광전지에서 밀봉용 접착제 필름으로서, 탁월한 접착력 및 투명도를 갖는 에틸렌-비닐 아세테이트 공중합체에 유기 퍼옥시드와 같은 가교제가 블렌드된 주성분으로서 이용함으로써 제조된 접착제 필름이 일반적으로 사용된다. 전력 발생 효율을 개선하는 것을 고려하여, 광전지 상으로 입사하는 광을 가능한 한 효율적으로 광전지 유닛 내로 포획하는 것이 매우 바람직하다. 따라서, 밀봉용 EVA 박막은 바람직하게는, 가능한 한 높은 투명도를 갖고, 입사 태양광을 흡수하거나 또는 반사하지 않을 것이며, 태양광 모두가 실질적으로 투과하는 것을 가능하게 할 EVA 박막이다.As an adhesive film for sealing in such a photovoltaic cell, an adhesive film prepared by using as a main component of a crosslinking agent such as an organic peroxide blended with an ethylene-vinyl acetate copolymer having excellent adhesion and transparency is generally used. In view of improving the power generation efficiency, it is highly desirable to trap light incident on the photovoltaic cell into the photovoltaic unit as efficiently as possible. Accordingly, the sealing EVA thin film is preferably an EVA thin film that will have as high transparency as possible, will not absorb or reflect incident sunlight, and will allow substantially all of the sunlight to be transmitted.
선행기술에서의 상기 문제점들을 고려하여, 본 발명은, 부식을 방지할 수 있으며, 황변을 효과적으로 억제할 수 있고, 우수한 절연 특성을 갖는, 광전지 밀봉용 접착제 필름을 제공하도록 의도된다. 또한, 본 발명은, 본 발명의 접착제 필름을 사용함으로써, 전력 발생 효율을 개선하며 우수한 외관 및 절연 특성을 갖는 것에서 효과적인 광전지를 제공하도록 또한 의도된다.In view of the above problems in the prior art, the present invention is intended to provide an adhesive film for sealing a photovoltaic cell, which can prevent corrosion, can effectively suppress yellowing, and has excellent insulating properties. In addition, the present invention is also intended to provide a photovoltaic cell that is effective in improving power generation efficiency and having excellent appearance and insulating properties, by using the adhesive film of the present invention.
상기 목적을 달성하기 위해, 본 발명의 발명자들은 집중 연구를 수행하였으며, 가교제, 특정 양의 카보디이미드 화합물 및 특정 구조를 갖는 광 안정화제가 첨가된, EVA 및 에틸렌-α-올레핀 공중합체의 블렌드를 중합체 베이스 재료로서 사용함으로써, 산 부식이 방지될 수 있고, 황변이 효과적으로 억제될 수 있으면서, 우수한 외관 및 탁월한 절연 특성을 갖는 광전지가 얻어질 수 있다는 것을 발견하였다.In order to achieve the above object, the inventors of the present invention have conducted intensive studies, and blends of EVA and ethylene-α-olefin copolymers to which a crosslinking agent, a specific amount of a carbodiimide compound, and a light stabilizer having a specific structure are added. It has been found that by using as a polymer base material, acid corrosion can be prevented, yellowing can be effectively suppressed, while a photovoltaic cell having an excellent appearance and excellent insulating properties can be obtained.
구체적으로, 본 발명의 광전지용 복합 접착제 필름은 EVA 및 에틸렌-α-올레핀 공중합체의 블렌드, 가교제, 광 안정화제 및 카보디이미드 화합물을 포함한다.Specifically, the composite adhesive film for photovoltaic cells of the present invention includes a blend of EVA and an ethylene-α-olefin copolymer, a crosslinking agent, a light stabilizer, and a carbodiimide compound.
에틸렌-α-올레핀 공중합체는 EVA 및 에틸렌-α-올레핀 공중합체의 블렌드의 100 중량부를 기준으로 50 내지 90 중량부의 양으로 함유된다.The ethylene-α-olefin copolymer is contained in an amount of 50 to 90 parts by weight based on 100 parts by weight of the blend of EVA and ethylene-α-olefin copolymer.
본 발명에 따른 광전지용 복합 접착제 필름은, 특정 함량의 카보디이미드 화합물을 EVA 공중합체 중에 배합함으로써, 광전지 내부에서 발생된 산을 효과적으로 흡수할 수 있고, 황변을 방지하면서 전도성 와이어 및 전극이 부식되는 것을 방지할 수 있다. 또한, 특정 구조를 갖는 광 안정화제를 조합함으로써, 황변의 발생을 효과적으로 억제하고, 장기 사용의 경우 내광성 및 내열성을 개선하는 것이 가능하다.The composite adhesive film for photovoltaic cells according to the present invention, by blending a specific content of a carbodiimide compound in the EVA copolymer, can effectively absorb the acid generated inside the photovoltaic cell, and prevents yellowing while preventing the conductive wire and electrode Can be prevented. In addition, by combining a light stabilizer having a specific structure, it is possible to effectively suppress the occurrence of yellowing and to improve light resistance and heat resistance in the case of long-term use.
본 발명의 광전지용 접착제 필름은 이제 하기에 상세히 설명될 것이다.The adhesive film for photovoltaic cells of the present invention will now be described in detail below.
본 발명에 사용된 EVA 공중합체는 특정하게 제한되지 않으며, 당업계에 공지되어 있는 임의의 EVA 공중합체가 사용될 수 있다. 일례로서, 본 발명에 사용된 EVA 공중합체는, 예를 들어 용매 또는 사슬 이동제(chain transfer agent)의 존재 또는 부재 하에 100 내지 300℃의 온도에서 라디칼 개시제의 존재 하에 공중합에 의해 제조될 수 있다.The EVA copolymer used in the present invention is not particularly limited, and any EVA copolymer known in the art may be used. As an example, the EVA copolymer used in the present invention can be prepared by copolymerization, for example, in the presence or absence of a solvent or a chain transfer agent at a temperature of 100 to 300° C. in the presence of a radical initiator.
본 발명의 에틸렌-α-올레핀 공중합체는 에틸렌과 C3-20 α-올레핀의 공중합에 의해 얻어질 수 있다. C3-20 α-올레핀으로서, 프로필렌, 1-부텐, 2-부텐, 1-펜텐, 3-메틸-1-부텐, 3,3-디메틸-1-부텐, 1-헥센, 4-메틸-1-펜텐, 3-메틸-1-펜텐, 1-옥텐, 1-데센, 1-도데센 등이 전형적으로 사용될 수 있다.The ethylene-α-olefin copolymer of the present invention can be obtained by copolymerization of ethylene and C 3-20 α-olefin. As a C 3-20 α-olefin, propylene, 1-butene, 2-butene, 1-pentene, 3-methyl-1-butene, 3,3-dimethyl-1-butene, 1-hexene, 4-methyl-1 -Pentene, 3-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene and the like can typically be used.
에틸렌-α-올레핀 공중합체는 당업계에 공지되어 있는 임의의 방법에 의해 제조될 수 있다. 일례로서, 촉매로서의 지글러(Ziegler) 촉매, 바나듐 화합물, 메탈로센 화합물 등의 존재 하에 중합에 의해 얻어진 생성물이 사용될 수 있다.The ethylene-α-olefin copolymer can be prepared by any method known in the art. As an example, a product obtained by polymerization in the presence of a Ziegler catalyst, a vanadium compound, a metallocene compound, or the like as a catalyst may be used.
EVA 및 에틸렌-α-올레핀 공중합체의 블렌드의 100 중량부를 기준으로, 에틸렌-α-올레핀 공중합체는 50 내지 90 중량부, 바람직하게는 50 내지 88 중량부, 보다 바람직하게는 50 내지 85 중량부, 특히 바람직하게는 70 내지 80 중량부의 양으로 함유된다.Based on 100 parts by weight of the blend of EVA and ethylene-α-olefin copolymer, the ethylene-α-olefin copolymer is 50 to 90 parts by weight, preferably 50 to 88 parts by weight, more preferably 50 to 85 parts by weight. , Particularly preferably in an amount of 70 to 80 parts by weight.
본 발명의 가교제로서, 유기 퍼옥시드계 가교제가 사용될 수 있다.As the crosslinking agent of the present invention, an organic peroxide-based crosslinking agent can be used.
유기 퍼옥시드계 가교제로서, 전형적으로 퍼옥시카보네이트가 사용된다.As the organic peroxide-based crosslinking agent, peroxycarbonate is typically used.
일례로서, 퍼옥시카보네이트는 2-메틸아밀 메틸퍼옥시카보네이트, 3-메틸아밀 메틸퍼옥시카보네이트, 2-에틸헥실 메틸퍼옥시카보네이트, 2-메틸펜틸 에틸퍼옥시카보네이트, 3-메틸펜틸 에틸퍼옥시카보네이트, 2-에틸헥실 에틸퍼옥시카보네이트, 2-메틸펜틸 프로필퍼옥시카보네이트, 3-메틸아밀 프로필퍼옥시카보네이트, 2-에틸헥실 프로필퍼옥시카보네이트, 2-메틸펜틸 tert-부틸퍼옥시카보네이트, 3-메틸펜틸 tert-부틸퍼옥시카보네이트 및 2-에틸헥실 tert-부틸퍼옥시카보네이트로 이루어진 군으로부터 선택될 수 있다.As an example, peroxycarbonate is 2-methylamyl methylperoxycarbonate, 3-methylamyl methylperoxycarbonate, 2-ethylhexyl methylperoxycarbonate, 2-methylpentyl ethylperoxycarbonate, 3-methylpentyl ethylperoxy carbonate Carbonate, 2-ethylhexyl ethylperoxycarbonate, 2-methylpentyl propylperoxycarbonate, 3-methylamyl propylperoxycarbonate, 2-ethylhexyl propylperoxycarbonate, 2-methylpentyl tert-butylperoxycarbonate, 3 -Methylpentyl tert-butylperoxycarbonate and 2-ethylhexyl tert-butylperoxycarbonate may be selected from the group consisting of.
가교제는 전형적으로 EVA 및 에틸렌-α-올레핀 공중합체의 블렌드의 100 중량부를 기준으로 0.3 내지 1.5 중량부, 바람직하게는 0.35 내지 1.1 중량부, 보다 바람직하게는 0.4 내지 0.55 중량부의 양으로 사용된다.The crosslinking agent is typically used in an amount of 0.3 to 1.5 parts by weight, preferably 0.35 to 1.1 parts by weight, more preferably 0.4 to 0.55 parts by weight, based on 100 parts by weight of the blend of EVA and ethylene-α-olefin copolymer.
본 발명의 광 안정화제는 전형적으로 하기 화학식 (1)에 의해 나타내어진 구조를 갖는 화합물이다:The light stabilizer of the present invention is typically a compound having a structure represented by the following formula (1):
상기 식에서, R은 수소 원자를 나타내고, R1, R2, R3 및 R4는 각각 C1-5 알킬을 나타낸다.In the above formula, R represents a hydrogen atom, and R 1 , R 2 , R 3 and R 4 each represent C 1-5 alkyl.
구체적으로, R1, R2, R3 및 R4는 각각 독립적으로 메틸, 에틸, 프로필 및 부틸로 이루어진 군으로부터 선택된다. R은 메틸, 에틸, 프로필, 이소프로필, 부틸, sec-부틸, tert-부틸, 펜틸, 이소펜틸, 헥실, 헵틸, n-옥틸, 이소-옥틸, tert-옥틸, 노닐, 이소-노닐, 데실, 도데실, 헥사데실, 헵타데실 또는 옥타데실로 이루어진 군으로부터 선택된다.Specifically, R 1 , R 2 , R 3 and R 4 are each independently selected from the group consisting of methyl, ethyl, propyl and butyl. R is methyl, ethyl, propyl, isopropyl, butyl, sec-butyl, tert-butyl, pentyl, isopentyl, hexyl, heptyl, n-octyl, iso-octyl, tert-octyl, nonyl, iso-nonyl, decyl, Dodecyl, hexadecyl, heptadecyl or octadecyl.
광 안정화제는 EVA 및 에틸렌-α-올레핀 공중합체의 블렌드의 100 중량부를 기준으로 0.2 내지 2.0 중량부, 바람직하게는 0.5 내지 1.5 중량부, 보다 바람직하게는 0.7 내지 1.2 중량부의 양으로 함유된다. 광 안정화제가 0.2 중량부 미만의 양으로 함유된 경우, 충분한 내광성 및 내열성을 얻는 것이 어렵다. 광 안정화제가 0.2 초과의 양으로 함유된 경우, 접착제 필름 황변이 유발될 수 있다.The light stabilizer is contained in an amount of 0.2 to 2.0 parts by weight, preferably 0.5 to 1.5 parts by weight, more preferably 0.7 to 1.2 parts by weight, based on 100 parts by weight of the blend of EVA and ethylene-α-olefin copolymer. When the light stabilizer is contained in an amount of less than 0.2 parts by weight, it is difficult to obtain sufficient light resistance and heat resistance. If the light stabilizer is contained in an amount greater than 0.2, yellowing of the adhesive film may be caused.
본 발명의 카보디이미드 화합물은 전형적으로 하기 화학식에 의해 나타내어진 구조를 갖는다:Carbodiimide compounds of the present invention typically have a structure represented by the following formula:
R5-N=C=N-(R6-N=C=N-)nR7 R 5 -N=C=N-(R 6 -N=C=N-) n R 7
상기 식에서, R5는 메틸이고, R7은 에틸이고, R6은 메틸렌이고, n은 500 미만의 양의 정수, 보다 바람직하게는 1 내지 50의 정수이다.In the above formula, R 5 is methyl, R 7 is ethyl, R 6 is methylene, and n is a positive integer less than 500, more preferably an integer from 1 to 50.
상기 구조를 갖는 카보디이미드 화합물을 EVA 공중합체 중에 배합함으로써, 광전지에서 발생된 산성 물질이 효과적으로 흡수될 수 있으며, 탁월한 내구성이 달성될 수 있다.By blending the carbodiimide compound having the above structure in the EVA copolymer, the acidic material generated in the photovoltaic cell can be effectively absorbed, and excellent durability can be achieved.
상기 카보디이미드 화합물은 당업계에 공지되어 있는 방법에 의해 제조될 수 있다. 일례로서, 이는 유기인 촉매의 존재 하에 케톤 용매 중에서 디이소시아네이트 화합물을 원료로서 사용하여 탈탄산화 축합(decarbonation condensation)에 의해 제조될 수 있다.The carbodiimide compound can be prepared by a method known in the art. As an example, it can be prepared by decarbonation condensation using a diisocyanate compound as a raw material in a ketone solvent in the presence of an organophosphorus catalyst.
본 발명의 필름은 전형적으로 EVA 및 에틸렌-α-올레핀 공중합체의 블렌드의 100 중량부를 기준으로 0.1 내지 0.35 중량부, 바람직하게는 0.1 내지 0.25 중량부, 보다 바람직하게는 0.15 내지 0.22 중량부의 카보디이미드 화합물을 함유한다. 카보디이미드가 0.1 중량부 미만의 양으로 함유된 경우, 발생된 산은 충분히 흡수되지 않을 수 있고, 전도성 와이어 및 전극의 부식이 유발될 수 있다. 카보디이미드가 0.35 중량부 초과의 양으로 함유된 경우, 황변이 유발될 수 있다.The film of the present invention is typically 0.1 to 0.35 parts by weight, preferably 0.1 to 0.25 parts by weight, more preferably 0.15 to 0.22 parts by weight, based on 100 parts by weight of the blend of EVA and ethylene-α-olefin copolymer. It contains a mid compound. When carbodiimide is contained in an amount of less than 0.1 parts by weight, the generated acid may not be sufficiently absorbed, and corrosion of the conductive wire and electrode may be caused. If carbodiimide is contained in an amount greater than 0.35 parts by weight, yellowing may be caused.
본 발명의 광전지 접착제 필름은 통상적으로 사용되는 방법에 의해 제조될 수 있으며, 이는 바람직하게는 캘린더 롤(calender roll), 혼련기, 밴버리(Banbury) 혼합기, 압출기 등을 통한 용융 블렌딩에 의해 제조된다. 연속 제조를 수행할 수 있는 압출기를 사용하여 이를 제조하는 것이 특히 바람직하다.The photovoltaic adhesive film of the present invention can be produced by a commonly used method, which is preferably produced by melt blending through a calender roll, a kneader, a Banbury mixer, an extruder, and the like. It is particularly preferred to produce them using extruders capable of carrying out continuous production.
압출 온도 범위는 바람직하게는 110 내지 140℃이다. 압출 온도가 110℃ 미만인 경우, 광전지 접착제 필름의 생산성은 악화될 수 있다. 압출 온도가 140℃ 초과인 경우, 광전지용 복합 접착제 필름을 얻기 위해 블렌드가 압출기에 의해 압출될 때 겔화가 발생할 수 있다.The extrusion temperature range is preferably 110 to 140°C. When the extrusion temperature is less than 110° C., the productivity of the photovoltaic adhesive film may deteriorate. When the extrusion temperature is greater than 140° C., gelation may occur when the blend is extruded by an extruder to obtain a composite adhesive film for photovoltaic cells.
본 발명의 광전지용 복합 접착제 필름을 제조하기 위한 방법의 일례로서, 예를 들어, 에틸렌-α-올레핀 공중합체 및 EVA 공중합체가 헨셀(Henschel) 혼합기 또는 회전 드럼 혼합기에 의해 상기 첨가제와 혼합되고, 압출기로 공급되어, 시트형 생성물을 형성할 수 있다.As an example of the method for producing the composite adhesive film for photovoltaic cells of the present invention, for example, an ethylene-α-olefin copolymer and an EVA copolymer are mixed with the additives by a Henschel mixer or a rotary drum mixer, It can be fed to an extruder to form a sheet-like product.
본 발명의 광전지용 접착제 필름의 두께는 특정하게 제한되지 않지만, 바람직하게는 30 μm 내지 3 mm이다.The thickness of the adhesive film for photovoltaic cells of the present invention is not particularly limited, but is preferably 30 μm to 3 mm.
실시예 1Example 1
75 중량부의 에틸렌-1-부텐 공중합체 (에틸렌 함량: 86 mol%, MFR=20 g/10 min, 밀도: 0.870 g/cm3), 25 중량부의 EVA (비닐 아세테이트 함량: 26 질량%, MFR=4.4 g/10 min), 0.55 중량부의 2-에틸헥실 tert-부틸퍼옥시카보네이트, 0.2 중량부의 카보디이미드 화합물 (CARBODILITE V-05, Nisshinbo Chemical Inc.) 및 1.0 중량부의 비스(1,2,2,6,6-펜타메틸-4-피페리딘) 세바케이트를 롤 밀(roll mill)에 공급하고, 75℃에서 혼합하여, 광전지용 접착제 필름 조성물을 제조하였다. 접착제 필름 조성물을 75℃에서 캘린더링하고, 냉각하여, 0.7 mm의 접착제 필름 두께를 갖는, 광전지용 접착제 필름을 얻었다.75 parts by weight of ethylene-1-butene copolymer (ethylene content: 86 mol%, MFR=20 g/10 min, density: 0.870 g/cm 3 ), 25 parts by weight of EVA (vinyl acetate content: 26% by mass, MFR= 4.4 g/10 min), 0.55 parts by weight of 2-ethylhexyl tert-butylperoxycarbonate, 0.2 parts by weight of a carbodiimide compound (CARBODILITE V-05, Nisshinbo Chemical Inc.) and 1.0 parts by weight of bis(1,2,2) ,6,6-pentamethyl-4-piperidine) sebacate was fed to a roll mill and mixed at 75° C. to prepare an adhesive film composition for photovoltaic cells. The adhesive film composition was calendered at 75° C. and cooled to obtain an adhesive film for photovoltaic cells having an adhesive film thickness of 0.7 mm.
실시예 2Example 2
81 중량부의 에틸렌-1-옥틸렌 공중합체 (에틸렌 함량: 89 mol%, MFR=48g/10min, 밀도: 0.884 g/cm3), 19 중량부의 EVA (비닐 아세테이트 함량: 26 질량%, MFR=4.4 g/10 min), 0.4 중량부의 2-에틸헥실 tert-부틸퍼옥시카보네이트, 0.13 중량부의 카보디이미드 화합물 (CARBODILITE V-05, Nisshinbo Chemical Inc.) 및 1.7 중량부의 비스(1,2,2,6,6-펜타메틸-4-피페리딘) 세바케이트를 롤 밀에 공급하고, 75℃에서 혼합하여, 광전지용 접착제 필름 조성물을 제조하였다. 접착제 필름 조성물을 75℃에서 캘린더링하고, 냉각하여, 1.1 mm의 접착제 필름 두께를 갖는, 광전지용 접착제 필름을 얻었다.81 parts by weight of ethylene-1-octylene copolymer (ethylene content: 89 mol%, MFR=48g/10min, density: 0.884 g/cm 3 ), 19 parts by weight of EVA (vinyl acetate content: 26% by mass, MFR=4.4 g/10 min), 0.4 parts by weight of 2-ethylhexyl tert-butylperoxycarbonate, 0.13 parts by weight of a carbodiimide compound (CARBODILITE V-05, Nisshinbo Chemical Inc.) and 1.7 parts by weight of bis(1,2,2, 6,6-pentamethyl-4-piperidine) sebacate was fed to a roll mill and mixed at 75° C. to prepare an adhesive film composition for photovoltaic cells. The adhesive film composition was calendered at 75° C. and cooled to obtain an adhesive film for photovoltaic cells having an adhesive film thickness of 1.1 mm.
실시예 3Example 3
84 중량부의 에틸렌-1-옥틸렌 공중합체 (에틸렌 함량: 89 mol%, MFR=48g/10min, 밀도: 0.884 g/cm3), 16 중량부의 EVA (비닐 아세테이트 함량: 26 질량%, MFR=4.4 g/10 min), 0.51 중량부의 2-에틸헥실 tert-부틸퍼옥시카보네이트, 0.25 중량부의 카보디이미드 화합물 (CARBODILITE V-05, Nisshinbo Chemical Inc.), 1.0 중량부의 비스(1,2,2,6,6-펜타메틸-4-피페리딘) 세바케이트 및 1.0 중량부의 1-메틸-8-(1,2,2,6,6-펜타메틸-4-피페리딘) 세바케이트를 롤 밀에 공급하고, 75℃에서 혼합하여, 광전지용 접착제 필름 조성물을 제조하였다. 접착제 필름 조성물을 75℃에서 캘린더링하고, 냉각하여, 2.0 mm의 접착제 필름 두께를 갖는, 광전지용 접착제 필름을 얻었다.84 parts by weight of ethylene-1-octylene copolymer (ethylene content: 89 mol%, MFR=48 g/10min, density: 0.884 g/cm 3 ), 16 parts by weight of EVA (vinyl acetate content: 26% by mass, MFR=4.4 g/10 min), 0.51 parts by weight of 2-ethylhexyl tert-butylperoxycarbonate, 0.25 parts by weight of carbodiimide compound (CARBODILITE V-05, Nisshinbo Chemical Inc.), 1.0 parts by weight of bis(1,2,2, 6,6-pentamethyl-4-piperidine) sebacate and 1.0 parts by weight of 1-methyl-8-(1,2,2,6,6-pentamethyl-4-piperidine) sebacate were roll milled And mixed at 75° C. to prepare an adhesive film composition for photovoltaic cells. The adhesive film composition was calendered at 75° C. and cooled to obtain an adhesive film for photovoltaic cells having an adhesive film thickness of 2.0 mm.
비교 실시예 1Comparative Example 1
베이스 재료로서 100 중량부의 EVA 공중합체를 사용하고, 에틸렌-1-부텐 공중합체를 사용하지 않은 것을 제외하고, 실시예 1의 것과 유사한 방식으로 광전지용 접착제 필름 조성물을 제조하였다. 얻어진 접착제 필름 조성물을 75℃에서 캘린더링하고, 냉각하여, 2.6 mm의 접착제 필름 두께를 갖는, 광전지용 접착제 필름을 얻었다.An adhesive film composition for a photovoltaic cell was prepared in a manner similar to that of Example 1, except that 100 parts by weight of the EVA copolymer was used as the base material and the ethylene-1-butene copolymer was not used. The obtained adhesive film composition was calendered at 75° C. and cooled to obtain an adhesive film for photovoltaic cells having an adhesive film thickness of 2.6 mm.
비교 실시예 2Comparative Example 2
비스(1,2,2,6,6-펜타메틸-4-피페리딘) 세바케이트를 사용하지 않은 것을 제외하고, 실시예 1의 것과 유사한 방식으로 광전지용 접착제 필름 조성물을 제조하였다. 얻어진 접착제 필름 조성물을 75℃에서 캘린더링하고, 냉각하여, 1.5 mm의 접착제 필름 두께를 갖는, 광전지용 접착제 필름을 얻었다.A photovoltaic adhesive film composition was prepared in a manner similar to that of Example 1, except that bis(1,2,2,6,6-pentamethyl-4-piperidine) sebacate was not used. The obtained adhesive film composition was calendered at 75° C. and cooled to obtain an adhesive film for photovoltaic cells having an adhesive film thickness of 1.5 mm.
비교 실시예 3Comparative Example 3
카보디이미드 화합물을 사용하지 않은 것을 제외하고, 실시예 1의 것과 유사한 방식으로 광전지용 접착제 필름 조성물을 제조하였다. 얻어진 접착제 필름 조성물을 75℃에서 캘린더링하고, 냉각하여, 1.9 mm의 접착제 필름 두께를 갖는, 광전지용 접착제 필름을 얻었다.A photovoltaic adhesive film composition was prepared in a manner similar to that of Example 1, except that the carbodiimide compound was not used. The obtained adhesive film composition was calendered at 75° C. and cooled to obtain an adhesive film for photovoltaic cells having an adhesive film thickness of 1.9 mm.
평가 방법Assessment Methods
1. 파단 시간(breakage time):1. Breakage time:
얻어진 EVA 박막은 태양 노화 시험기(solar aging tester) (칠판(blackboard) 온도: 63℃, 물 분무(water mist)는 없음)에 의해 열화를 겪었으며, 파단 시간 (파단에 요구되는 시간)은 120시간마다 1회 측정되었다.The obtained EVA thin film was subjected to deterioration by a solar aging tester (blackboard temperature: 63°C, no water mist), and the breaking time (the time required for breaking) was 120 hours. It was measured once every time.
2. PID(Potential Induced Degradation) 평가:2. Evaluation of Potential Induced Degradation (PID):
상기 얻어진 광전지용 접착제 필름을 표면측 접착제 필름 및 후면측 접착제 필름으로서 사용하였으며, 광전지 유닛들이 표면측 투명 보호 부재 (유리 플레이트) 및 후면측 보호 부재 (PET 필름) 사이에 샌드위칭되어 4개의 광전지 유닛들이 연결된 광전지 마이크로조립체를 제조하는 경우에 가열 및 가압을 수행하였다. PID 현상을 발생시키는 것에 대한 모델 시험을 위해, 제조된 광전지 마이크로조립체 각각을 광 수용 측을 저부 측으로서 갖는 물 탱크 중에 침지시키고, 단락 모듈(short-circuited module)의 출력 단자를 음 (-) 전극에 연결하고, 양 (+) 전극은 85℃의 온도 및 85%의 상대 습도에서 물 탱크 중 구리 플레이트에 연결하고, 1500V의 전압을 24시간 동안 인가하였다.The obtained photovoltaic adhesive film was used as a surface adhesive film and a rear adhesive film, and the photovoltaic units were sandwiched between the surface-side transparent protective member (glass plate) and the rear-side protective member (PET film) to form four photovoltaic units. Heating and pressing were performed when preparing a photovoltaic microassembly to which they were connected. For the model test for generating the PID phenomenon, each of the manufactured photovoltaic microassemblies was immersed in a water tank having the light receiving side as the bottom side, and the output terminal of the short-circuited module was connected to the negative (-) electrode. And the positive (+) electrode was connected to the copper plate in the water tank at a temperature of 85° C. and a relative humidity of 85%, and a voltage of 1500 V was applied for 24 hours.
상기 시험 전후에, 각각의 광전지 마이크로조립체의 최대 출력값 (Pmax)을 측정하고, 출력값 유지율 ((시험후 Pmax/시험전 Pmax)Х100 (%))을 계산하였다. 95% 이상의 출력값 유지율을 갖는 광전지 마이크로조립체는 ◎로서 평가되었고, 95% 미만 90% 이상의 출력값 유지율을 갖는 광전지 마이크로조립체는 ○로서 평가되었고, 90% 미만 85% 이상의 출력값 유지율을 갖는 광전지 마이크로조립체는 △로서 평가되었다.Before and after the test, the maximum output value (P max ) of each photovoltaic microassembly was measured, and the output value retention rate ((P max after test / P max before test) Х100 (%)) was calculated. A photovoltaic microassembly having an output value retention rate of 95% or more was evaluated as ◎, a photovoltaic microassembly having an output value retention rate of less than 95% and an output value retention rate of 90% or more was evaluated as ○, and a photovoltaic microassembly having an output value retention rate of less than 90% and more than 85% was evaluated as △ Was evaluated as.
3. 황변도(yellowness)3. Yellowness
얻어진 광전지용 접착제 필름을 2개의 유리 (3.0 mm의 두께를 가짐) 사이에 샌드위칭시키고, 진공 적층기(vacuum laminator)를 사용하여 10분 동안 100℃에서 일시적으로 크림핑(crimping)시키고, 오븐 내에 위치시킨 다음, 가교를 위해 150℃에서 30분 동안 가열하여 적층체를 얻었다.The obtained photovoltaic adhesive film was sandwiched between two glasses (having a thickness of 3.0 mm), crimped temporarily at 100° C. for 10 minutes using a vacuum laminator, and in an oven. After positioning, the laminate was obtained by heating at 150° C. for 30 minutes for crosslinking.
적층체는 150시간 동안 자외선으로 조사된 후 황변도에 대해 색차계(color difference meter)를 사용하여 측정되었다. 자외선 조사는 s-UV 조사 시험기를 사용하여 수행되었으며, 이는 63℃의 온도를 갖는 환경에서 100mW/cm2의 강도로 295 내지 400 nm 자외선을 조사하였다. 4.0 미만의 황변도는 ○로서 평가되었고, 4.0 이상의 황변도는 ×로서 평가되었다.The laminate was irradiated with ultraviolet rays for 150 hours, and then the degree of yellowness was measured using a color difference meter. Ultraviolet irradiation was performed using an s-UV irradiation tester, which was irradiated with 295 to 400 nm ultraviolet rays at an intensity of 100mW/cm 2 in an environment having a temperature of 63°C. The degree of yellowing of less than 4.0 was evaluated as ○, and the degree of yellowing of 4.0 or more was evaluated as x.
결과는 하기 표 1에 나타냈다:The results are shown in Table 1 below:
(h)Breaking time
(h)
표 1로부터 알 수 있는 바와 같이, 본 발명의 광전지용 접착제 필름은 파단 시간, PID 성능 및 내황변성의 측면에서 보다 우수한 효과를 달성하였다.As can be seen from Table 1, the adhesive film for a photovoltaic cell of the present invention achieved more excellent effects in terms of breaking time, PID performance, and yellowing resistance.
Claims (6)
상기 에틸렌-α-올레핀 공중합체는 상기 EVA 및 에틸렌-α-올레핀 공중합체의 블렌드의 100 중량부를 기준으로 50 내지 90 중량부의 양으로 함유되고, 상기 카보디이미드 화합물은 하기 화학식에 의해 나타내어진 구조를 갖는, 광전지용 복합 접착제 필름:
R5-N=C=N-(R6-N=C=N-)nR7
상기 식에서, R5는 메틸이고, R7은 에틸이고, R6은 메틸렌이고, n은 500 미만의 양의 정수이다.A composite adhesive film for a photovoltaic cell, comprising a blend of EVA and an ethylene-α-olefin copolymer, a crosslinking agent, a light stabilizer, and a carbodiimide compound,
The ethylene-α-olefin copolymer is contained in an amount of 50 to 90 parts by weight based on 100 parts by weight of the blend of the EVA and ethylene-α-olefin copolymer, and the carbodiimide compound has a structure represented by the following formula Having a composite adhesive film for photovoltaic cells:
R 5 -N=C=N-(R 6 -N=C=N-) n R 7
Wherein R 5 is methyl, R 7 is ethyl, R 6 is methylene, and n is a positive integer less than 500.
A photovoltaic assembly obtained by encapsulating a photovoltaic element with a composite adhesive film for photovoltaic cells according to claim 1.
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