JP2007329404A - Evaluation method of solar cell sealing material - Google Patents

Evaluation method of solar cell sealing material Download PDF

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JP2007329404A
JP2007329404A JP2006161278A JP2006161278A JP2007329404A JP 2007329404 A JP2007329404 A JP 2007329404A JP 2006161278 A JP2006161278 A JP 2006161278A JP 2006161278 A JP2006161278 A JP 2006161278A JP 2007329404 A JP2007329404 A JP 2007329404A
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solar cell
sealing material
cell sealing
acetic acid
test
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Makiko Shimada
真紀子 島田
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Bridgestone Corp
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Bridgestone Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10788—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing ethylene vinylacetate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10018—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising only one glass sheet

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an evaluation method of a solar cell sealing material for obtaining the solar cell sealing material which hardly generates aging deterioration caused by generated acetic acid. <P>SOLUTION: In the method, a solar cell sealing material is evaluated which is mainly composed of ethylene vinylacetate copolymer. Pressure cooker test is performed for a solar cell sealing material for 240 hours under environment conditions of a temperature of 121°C, a relative humidity of 100% RH and 2 atmospheres, and durability of the solar cell sealing material is evaluated by an acetic acid generation amount after the test. A solar cell sealing material whose acetic acid generation amount after test is 6,000 ppm or less can be evaluated as good. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は太陽電池封止材の評価方法（以下、単に「封止材」および「評価方法」とも称する）に関し、詳しくは、エチレン酢酸ビニル共重合体（ＥＶＡ）を主成分とし、太陽電池モジュールにおいて発電素子を封止するために用いられる太陽電池封止材の評価方法に関する。   TECHNICAL FIELD The present invention relates to a solar cell encapsulant evaluation method (hereinafter, also simply referred to as “encapsulant” and “evaluation method”), and more specifically, an ethylene vinyl acetate copolymer (EVA) as a main component and a solar cell module. The present invention relates to a method for evaluating a solar cell sealing material used for sealing a power generating element.

近年、太陽光を利用したクリーンなエネルギー資源として、太陽電池に対する関心が高まってきている。太陽電池の発電素子は、一般に、シリコン等の半導体からなり、水分や埃等の異物や外気の影響から保護するための容器や樹脂中に封入されて太陽電池モジュール（パネル）として使用される。   In recent years, interest in solar cells has increased as a clean energy resource using sunlight. The power generation element of a solar cell is generally made of a semiconductor such as silicon, and is used as a solar cell module (panel) by being enclosed in a container or resin for protecting from the influence of foreign matter such as moisture and dust and the outside air.

図１に、このような太陽電池モジュールの構造の一例を示す。図示する太陽電池モジュール１０は、ガラス基板１、封止膜２、シリコン等の発電素子３、封止膜４およびバックカバー５を順次積層してなる構造を有し、この場合、太陽電池素子３は、樹脂材料からなる封止膜２，４内に封入されて保護されている。封止材として用いられる樹脂としては、低コスト等の観点から、エチレン−酢酸ビニル共重合体（ＥＶＡ）が、現在一般に使用されている。   FIG. 1 shows an example of the structure of such a solar cell module. The illustrated solar cell module 10 has a structure in which a glass substrate 1, a sealing film 2, a power generation element 3 such as silicon, a sealing film 4 and a back cover 5 are sequentially stacked. In this case, the solar cell element 3 Are sealed and sealed in sealing films 2 and 4 made of a resin material. As a resin used as the sealing material, an ethylene-vinyl acetate copolymer (EVA) is currently generally used from the viewpoint of low cost and the like.

太陽電池封止材に係る改良技術としては、例えば、特許文献１に、酢酸ビニル含有率が３０重量％以下のＥＶＡからなるものとすることで、高い体積固有抵抗を実現した太陽電池封止材が記載されている。また、特許文献２には、酢酸ビニル含有率が１０〜３０重量％であって、体積固有抵抗率が５．０×１０14Ω以上であるＥＶＡからなる太陽電池封止材が記載されている。
特開平１１−５４７６７号公報（特許請求の範囲等） 特開２０００−１８３３８５号公報（特許請求の範囲等） As an improved technique related to the solar cell sealing material, for example, Patent Document 1 includes a solar cell sealing material that realizes a high volume resistivity by being made of EVA having a vinyl acetate content of 30% by weight or less. Is described. Patent Document 2 describes a solar cell encapsulant made of EVA having a vinyl acetate content of 10 to 30% by weight and a volume resistivity of 5.0 × 10 14 Ω or more. .
Japanese Patent Application Laid-Open No. 11-54767 (Claims) JP 2000-183385 A (Claims etc.)

しかしながら、ＥＶＡからなる封止材では、使用に伴い酢酸が発生するため、この発生酢酸が原因となって、太陽電池の発電性能の劣化が進行してしまうという問題があった。特に、太陽電池は数十年単位の長期使用が期待されるため、経時による劣化の問題については早急な解消が望まれていた。   However, in the sealing material made of EVA, acetic acid is generated with use, and thus the generated acetic acid causes the deterioration of the power generation performance of the solar cell. In particular, since solar cells are expected to be used for a long period of several decades, it has been desired to quickly solve the problem of deterioration over time.

そこで本発明の目的は、上記の問題に鑑みて、発生酢酸による経時劣化を生じにくい太陽電池封止材を得るための太陽電池封止材の評価方法を提供することにある。   Therefore, in view of the above problems, an object of the present invention is to provide a solar cell sealing material evaluation method for obtaining a solar cell sealing material that is unlikely to deteriorate with time due to generated acetic acid.

本発明者は鋭意検討した結果、下記構成とすることにより、発電性能の劣化の少ない封止材が得られることを見出して、本発明の評価方法を完成するに至った。   As a result of intensive studies, the present inventor has found that a sealing material with little deterioration in power generation performance can be obtained by using the following configuration, and has completed the evaluation method of the present invention.

即ち、本発明の太陽電池封止材の評価方法は、エチレン酢酸ビニル共重合体を主成分とする太陽電池封止材の評価方法であって、太陽電池封止材に対し、温度１２１℃、相対湿度１００％ＲＨ、２気圧の環境条件で２４０時間のプレッシャークッカー試験を行い、試験後の酢酸発生量により、該太陽電池封止材の耐久性を評価することを特徴とするものである。   That is, the solar cell sealing material evaluation method of the present invention is a solar cell sealing material evaluation method mainly composed of an ethylene-vinyl acetate copolymer, and the temperature is 121 ° C. with respect to the solar cell sealing material. A pressure cooker test is conducted for 240 hours under an environmental condition of relative humidity of 100% RH and 2 atm, and the durability of the solar cell encapsulant is evaluated by the amount of acetic acid generated after the test.

本発明においては、前記試験後の酢酸発生量が６０００ｐｐｍ以下、特には７００ｐｐｍ以下である太陽電池封止材を良と評価することができる。   In this invention, the solar cell sealing material whose acetic acid generation amount after the said test is 6000 ppm or less, especially 700 ppm or less can be evaluated as good.

本発明によれば、上記構成としたことにより、発生酢酸による経時劣化を生じにくい太陽電池封止材を得ることのできる太陽電池封止材の評価方法を実現することが可能となった。   According to the present invention, it has become possible to realize a solar cell encapsulating material evaluation method capable of obtaining a solar cell encapsulating material that is less likely to deteriorate with time due to generated acetic acid.

以下、本発明の好適な実施の形態について詳細に説明する。
本発明の太陽電池封止材の評価方法は、ＥＶＡを主成分とする太陽電池封止材の評価方法であって、太陽電池封止材に対し、温度１２１℃、相対湿度１００％ＲＨ、２気圧の環境条件で２４０時間のプレッシャークッカー（ＰＣＴ）試験を行い、試験後の酢酸発生量により封止材の耐久性を評価するものである。 Hereinafter, preferred embodiments of the present invention will be described in detail.
The solar cell encapsulating material evaluation method of the present invention is a solar cell encapsulating material evaluation method mainly composed of EVA, and the temperature is 121 ° C. and the relative humidity is 100% RH with respect to the solar cell encapsulating material. A pressure cooker (PCT) test for 240 hours is performed under atmospheric pressure, and the durability of the sealing material is evaluated based on the amount of acetic acid generated after the test.

本発明においては、ＰＣＴ試験による耐久後の酢酸発生量に基づき封止材の耐久性を評価することで、発生酢酸による発電性能の劣化を生ずることがない耐久性に優れた太陽電池封止材を得ることができる。具体的な評価基準としては、試験後の酢酸発生量が６０００ｐｐｍ以下、特には７００ｐｐｍ以下である封止材を良と評価することができ、これは、酢酸ビニル（ＶＡ）含有率２５％以下、特には１５〜２２％のＥＶＡに相当する。実使用上は、ＶＡ含有率２３〜２５％程度のＥＶＡに相当する、試験後の酢酸発生量が６００ｐｐｍ以下程度の封止材であれば、要求される耐久性を満足することができる。   In the present invention, by evaluating the durability of the sealing material based on the amount of acetic acid generated after the endurance by the PCT test, the solar cell sealing material excellent in durability that does not cause deterioration in power generation performance due to the generated acetic acid Can be obtained. As a specific evaluation standard, the amount of acetic acid generated after the test can be evaluated as good when the sealing material is 6000 ppm or less, particularly 700 ppm or less, which is a vinyl acetate (VA) content of 25% or less, In particular, it corresponds to 15-22% EVA. In practical use, the required durability can be satisfied if the sealing material has an acetic acid generation amount of about 600 ppm or less, which corresponds to EVA having a VA content of about 23 to 25%.

本発明の評価方法は、ＥＶＡを主成分とする封止材であれば、特に制限はなく、いかなるものにも適用可能である。かかる封止材は、例えば、ＥＶＡに、必要に応じてシランカップリング剤、有機過酸化物、光増感剤、架橋助剤、安定剤、着色剤、紫外線吸収剤、老化防止剤、変色防止剤等を添加し、これら各成分を混合することにより得ることができる。   The evaluation method of the present invention is not particularly limited as long as it is a sealing material mainly composed of EVA, and can be applied to any material. Such sealing materials are, for example, EVA, silane coupling agents, organic peroxides, photosensitizers, crosslinking aids, stabilizers, colorants, ultraviolet absorbers, anti-aging agents, anti-discoloration as required. It can be obtained by adding an agent and mixing these components.

シランカップリング剤は、ＥＶＡの封止材としての性能と、主として太陽電池下部基板乃至発電素子との接着力をさらに向上させる目的で添加するものであり、例えば、γ−クロロプロピルトリメトキシシラン、ビニルトリクロロシラン、ビニルトリエトキシシラン、ビニル−トリス（β−メトキシエトキシ）シラン、γ−メタクリロキシプロピルトリメトキシシラン、β−（３，４−エトキシシクロヘキシル）エチル−トリメトキシシラン、γ−グリシドキシプロピルトリメトキシシラン、ビニルトリアセトキシシラン、γ−メルカプトプロピルトリメトキシシラン、γ−アミノプロピルトリメトキシシラン、Ｎ−β−（アミノエチル）−γ−アミノプロピルトリメトキシシラン等を用いることができる。これらのシランカップリング剤の配合量はＥＶＡ１００重量部に対して５重量部以下、好ましくは１重量部以下である。より好ましくは、ＥＶＡ１００重量部に対するシランカップリング剤の添加割合を０．０１〜１重量部とすることで、安定した接着力と、高い体積固有抵抗を得ることができる。封止材の体積固有抵抗の向上の観点からは、珪素原子に直接結合している、炭素原子数４以下の官能基を有するシランカップリング剤、特にはビニルトリメトキシシランをＥＶＡに添加することが有効である。   The silane coupling agent is added for the purpose of further improving the performance as a sealing material for EVA and mainly the adhesion between the solar cell lower substrate and the power generation element. For example, γ-chloropropyltrimethoxysilane, Vinyltrichlorosilane, vinyltriethoxysilane, vinyl-tris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, β- (3,4-ethoxycyclohexyl) ethyl-trimethoxysilane, γ-glycidoxy Propyltrimethoxysilane, vinyltriacetoxysilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane, and the like can be used. The compounding amount of these silane coupling agents is 5 parts by weight or less, preferably 1 part by weight or less with respect to 100 parts by weight of EVA. More preferably, by setting the addition ratio of the silane coupling agent to 100 parts by weight of EVA to 0.01 to 1 part by weight, it is possible to obtain a stable adhesive force and high volume resistivity. From the viewpoint of improving the volume resistivity of the sealing material, a silane coupling agent having a functional group having 4 or less carbon atoms, which is directly bonded to a silicon atom, particularly vinyltrimethoxysilane should be added to EVA. Is effective.

有機過酸化物は、あらかじめ加えて熱分解することでＥＶＡに架橋構造を持たせることができるものであり、１００℃以上でラジカルを発生するものであればいずれのものも使用可能であるが、配合時の安定性を考慮に入れれば、半減期１０時間、分解温度７０℃以上であることが好ましく、例えば、２，５−ジメチルヘキサン−２，５−ジハイドロパーオキサイド、２，５−ジメチル−２，５−ジ（ｔ−ブチルパーオキシ）ヘキサン−３、ジ−ｔ−ブチルパーオキサイド、ｔ−ジクミルパーオキサイド、２，５−ジメチル−２，５−ジ（ｔ−ブチルパーオキシ）ヘキサン、ジクミルパーオキサイド、α，α′−ビス（ｔ−ブチルパーオキシイソプロピル）ベンゼン、ｎ−ブチル−４，４−ビス（ｔ−ブチルパーオキシ）ブタン、２，２−ビス（ｔ−ブチルパーオキシ）ブタン、１，１−ビス（ｔ−ブチルパーオキシ）シクロヘキサン、１，１−ビス（ｔ−ブシルパーオキシ）３，３，５−トリメチルシクロヘキサン、ｔ−ブチルパーオキシベンズエート、ベンゾイルパーオキサイド等を用いることができる。これらの有機過酸化物の配合量はＥＶＡ１００重量部に対して５重量部以下で充分である。   The organic peroxide can be added to the EVA in advance and thermally decomposed to give the EVA a crosslinked structure, and any one that generates radicals at 100 ° C. or higher can be used. Taking into account the stability at the time of blending, it is preferable that the half-life is 10 hours and the decomposition temperature is 70 ° C. or higher. For example, 2,5-dimethylhexane-2,5-dihydroperoxide, 2,5-dimethyl -2,5-di (t-butylperoxy) hexane-3, di-t-butyl peroxide, t-dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) Hexane, dicumyl peroxide, α, α'-bis (t-butylperoxyisopropyl) benzene, n-butyl-4,4-bis (t-butylperoxy) butane, 2,2-bis (T-butylperoxy) butane, 1,1-bis (t-butylperoxy) cyclohexane, 1,1-bis (t-butylsyloxy) 3,3,5-trimethylcyclohexane, t-butylperoxybenzate, Benzoyl peroxide or the like can be used. A blending amount of these organic peroxides is not more than 5 parts by weight with respect to 100 parts by weight of EVA.

光増感剤は、あらかじめ加えて光照射により分解することでＥＶＡに架橋構造を持たせることができるものであり、光照射でラジカルを生じるものであればいかなるものでもよく、例えば、ベンゾイン、ベンゾメチルエーテル、ベンゾインイソエチルエーテル、ベンゾインイソプロピルエーテル、ベンゾインイソブチルエーテル、ジベンゾイル、５−ニトリアセナフテン、ヘキサクロロシクロペンタジエン、パラニトロジフェニル、パラニトロアニリン、２，４，６−トリニトロアニリン、１，２−ベンズアントラキノン等を用いることができる。これらの光増感剤はＥＶＡ１００重量部に対して、通常１０重量部以下の量で用いられる。   The photosensitizer can be added in advance and decomposed by light irradiation to give EVA a crosslinked structure. Any photosensitizer may be used as long as it generates a radical upon light irradiation. Methyl ether, benzoin isoethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, dibenzoyl, 5-nitrotriacenaphthene, hexachlorocyclopentadiene, paranitrodiphenyl, paranitroaniline, 2,4,6-trinitroaniline, 1,2- Benzanthraquinone and the like can be used. These photosensitizers are usually used in an amount of 10 parts by weight or less with respect to 100 parts by weight of EVA.

また、ＥＶＡ封止材は長期にわたり使用され、風雨等に曝露されることが予測されるため、耐久性を向上させる目的で、架橋剤を添加してゲル分率を向上させることも可能である。この目的に用いられる架橋助剤としては、公知のものとしてトリアリルイソシアヌレートまたはトリアリルイソシアネート等の３官能性架橋助剤の他、単官能性の架橋助剤等を挙げることができる。これらの架橋助剤はＥＶＡ１００重量部に対して１０重量部以下の割合で用いられる。   In addition, since the EVA sealing material is used for a long time and is expected to be exposed to wind and rain, it is possible to improve the gel fraction by adding a crosslinking agent for the purpose of improving durability. . Examples of the crosslinking aid used for this purpose include known trifunctional crosslinking aids such as triallyl isocyanurate or triallyl isocyanate, as well as monofunctional crosslinking aids. These crosslinking aids are used in a proportion of 10 parts by weight or less with respect to 100 parts by weight of EVA.

着色剤としては、金属酸化物、金属粉等の無機顔料、アゾ系、フタロシアニン系、アチ系、酸性、または塩基染料系レーキ等の有機顔料がある。   Examples of the colorant include inorganic pigments such as metal oxides and metal powders, and organic pigments such as azo, phthalocyanine, acetic, acidic, or basic dye lakes.

紫外線吸収剤としては、例えば、２−ヒドロキシ−４−オクトキシベンゾフェノン、２−ヒドロキシ−４−メトキシ−５−スルホベンゾフェノン等のベンゾフェノン系、２−（２′−ヒドロキシ−５−メチルフェニル）ベンゾトリアゾール等のベンゾトリアゾール系、フェニルサルシレート、ｐ−ｔ−ブチルフェニルサリシレート等のヒンダードアミン系が挙げられる。   Examples of the ultraviolet absorber include benzophenone series such as 2-hydroxy-4-octoxybenzophenone and 2-hydroxy-4-methoxy-5-sulfobenzophenone, and 2- (2'-hydroxy-5-methylphenyl) benzotriazole. And hindered amines such as benzotriazole, phenyl salicylate, and pt-butylphenyl salicylate.

老化防止剤としては、アミン系、フェノール系、ビスフェニル系、ヒンダードアミン系があり、具体的には例えば、ジ−ｔ−ブチル−ｐ−クレゾール、ビス（２，２，６．６−テトラメチル−４−ピペラジル）セバケート等が挙げられる。   Antiaging agents include amines, phenols, bisphenyls, and hindered amines. Specifically, for example, di-t-butyl-p-cresol, bis (2,2,6.6-tetramethyl- 4-piperazyl) sebacate and the like.

さらに、安定性を向上する目的でハイドロキノン、ハイドロキノンモノメチルエーテル、Ｐ−ベンゾキノン、メチルハイドロキノン等をＥＶＡ１００重量部に対して５重量部以下で加えることができる。   Furthermore, hydroquinone, hydroquinone monomethyl ether, P-benzoquinone, methylhydroquinone and the like can be added at 5 parts by weight or less with respect to 100 parts by weight of EVA for the purpose of improving stability.

以下、本発明を、実施例を用いてより詳細に説明する。
（サンプル作製）
下記表１中に示す配合に従い、実験例１〜３の３種の封止材組成物を調製し、図２に示すような、ガラス基板１１、ＥＶＡシート（封止材）１２およびバックカバー１３からなるモジュールサンプル２０を作製した。積層したモジュールサンプル２０は、温度１５０℃で３０分加熱して架橋させた。 Hereinafter, the present invention will be described in more detail with reference to examples.
(Sample preparation)
According to the composition shown in Table 1 below, three kinds of sealing material compositions of Experimental Examples 1 to 3 were prepared, and a glass substrate 11, an EVA sheet (sealing material) 12, and a back cover 13 as shown in FIG. A module sample 20 comprising: The laminated module sample 20 was crosslinked by heating at a temperature of 150 ° C. for 30 minutes.

（実験条件）
温度１２１℃、相対湿度１００％ＲＨ、２気圧の環境条件で２４０時間のプレッシャークッカー試験を行い、酢酸発生の反応速度を加速化させて、耐久後の酢酸発生量を測定した。具体的には、湿熱の耐久試験機内に上記モジュールサンプル２０を投入し、２４０時間経過後にモジュールサンプル２０のＥＶＡシート１２の部分のみを剥がして、酢酸定量用のサンプルとした。 (Experimental conditions)
A pressure cooker test was conducted for 240 hours under an environmental condition of a temperature of 121 ° C., a relative humidity of 100% RH, and 2 atmospheres, and the reaction rate of acetic acid generation was accelerated to measure the amount of acetic acid generated after endurance. Specifically, the module sample 20 was put into a wet heat durability tester, and after 240 hours, only the EVA sheet 12 portion of the module sample 20 was peeled off to obtain a sample for acetic acid determination.

（評価方法）
（１）アセトン抽出：０．５ｇのＥＶＡシート片を秤量し、アセトン２ｃｃに浸漬して密閉し、５０時間放置した。
（２）酢酸定量：溶液に対しガスクロマトグラフ分析を行った。
得られた結果を、下記の表１中に併せて示す。 (Evaluation methods)
(1) Acetone extraction: 0.5 g EVA sheet piece was weighed, immersed in 2 cc of acetone, sealed, and left for 50 hours.
(2) Quantification of acetic acid: Gas chromatographic analysis was performed on the solution.
The obtained results are also shown in Table 1 below.

Figure 2007329404
＊１）ＥＶＡ（１）：ＶＡ含有率２６％
＊２）ＥＶＡ（２）：ＶＡ含有率２２％
＊３）ＥＶＡ（３）：ＶＡ含有率２０％
＊４）ＥＶＡ（４）：ＶＡ含有率１５％
＊５）有機過酸化物：１，1−ビス（ｔ−ブチルパーオキシ）トリメチルシクロヘキサン
＊６）架橋助剤：トリアリルイソシアヌレート
＊７）シランカップリング剤：γ−メタクリロキシプロピルトリメトキシシラン
Figure 2007329404
 * 1) EVA (1): VA content 26%
* 2) EVA (2): VA content 22%
* 3) EVA (3): VA content 20%
* 4) EVA (4): VA content 15%
* 5) Organic peroxide: 1,1-bis (t-butylperoxy) trimethylcyclohexane * 6) Crosslinking aid: triallyl isocyanurate * 7) Silane coupling agent: γ-methacryloxypropyltrimethoxysilane

上記表１の結果より、ＶＡ含有率が小さいＥＶＡ樹脂を用いた封止材ほど、耐久後の酢酸発生量が少ないことが確認できた。   From the results of Table 1 above, it was confirmed that the amount of acetic acid generated after durability was smaller as the sealing material using the EVA resin having a smaller VA content.

太陽電池モジュールの一構成例を示す概略断面図である。It is a schematic sectional drawing which shows one structural example of a solar cell module. 実施例で使用したサンプルの構成を示す概略断面図である。It is a schematic sectional drawing which shows the structure of the sample used in the Example.

符号の説明Explanation of symbols

１，１１ ガラス基板
２，４，１２ 封止膜（ＥＶＡシート）
３ 発電素子
５，１３バックカバー
１０ 太陽電池モジュール
２０ モジュールサンプル 1,11 Glass substrate 2, 4, 12 Sealing film (EVA sheet)
3 Power generation element 5, 13 Back cover 10 Solar cell module 20 Module sample

Claims (3)

エチレン酢酸ビニル共重合体を主成分とする太陽電池封止材の評価方法であって、太陽電池封止材に対し、温度１２１℃、相対湿度１００％ＲＨ、２気圧の環境条件で２４０時間のプレッシャークッカー試験を行い、試験後の酢酸発生量により、該太陽電池封止材の耐久性を評価することを特徴とする太陽電池封止材の評価方法。   A method for evaluating a solar cell encapsulant comprising an ethylene vinyl acetate copolymer as a main component, wherein the solar cell encapsulant has a temperature of 121 ° C., a relative humidity of 100% RH, and an atmospheric condition of 2 atmospheres for 240 hours. A method for evaluating a solar cell encapsulant, comprising performing a pressure cooker test and evaluating the durability of the solar cell encapsulant based on the amount of acetic acid generated after the test. 前記試験後の酢酸発生量が６０００ｐｐｍ以下である太陽電池封止材を良と評価する請求項１記載の太陽電池封止材の評価方法。   The evaluation method of the solar cell sealing material of Claim 1 which evaluates the solar cell sealing material whose acetic acid generation amount after the said test is 6000 ppm or less as good. 前記試験後の酢酸発生量が７００ｐｐｍ以下である太陽電池封止材を良と評価する請求項２記載の太陽電池封止材の評価方法。   The solar cell sealing material evaluation method according to claim 2, wherein the solar cell sealing material having an acetic acid generation amount of 700 ppm or less after the test is evaluated as good.
JP2006161278A 2006-06-09 2006-06-09 Evaluation method of solar cell sealing material Withdrawn JP2007329404A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011034070A1 (en) 2009-09-17 2011-03-24 東洋インキ製造株式会社 Protective sheet for the backside of a solar cell, manufacturing method therefor, and solar cell module
WO2011068188A1 (en) * 2009-12-04 2011-06-09 Jsr株式会社 Sealing material, laminated sheet for solar cell module, and solar cell module
EP2657309A1 (en) 2012-04-23 2013-10-30 Shin-Etsu Chemical Co., Ltd. Photovoltaic silicone encapsulant and photovoltaic module
JP2018174318A (en) * 2017-03-30 2018-11-08 エスケイシー・カンパニー・リミテッドＳｋｃ Ｃｏ．， Ｌｔｄ． Encapsulant for solar cell, manufacturing method thereof, and solar cell module comprising the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011034070A1 (en) 2009-09-17 2011-03-24 東洋インキ製造株式会社 Protective sheet for the backside of a solar cell, manufacturing method therefor, and solar cell module
CN102498578A (en) * 2009-09-17 2012-06-13 东洋油墨Sc控股株式会社 Protective sheet for the backside of a solar cell, manufacturing method therefor, and solar cell module
WO2011068188A1 (en) * 2009-12-04 2011-06-09 Jsr株式会社 Sealing material, laminated sheet for solar cell module, and solar cell module
EP2657309A1 (en) 2012-04-23 2013-10-30 Shin-Etsu Chemical Co., Ltd. Photovoltaic silicone encapsulant and photovoltaic module
JP2018174318A (en) * 2017-03-30 2018-11-08 エスケイシー・カンパニー・リミテッドＳｋｃ Ｃｏ．， Ｌｔｄ． Encapsulant for solar cell, manufacturing method thereof, and solar cell module comprising the same

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