JP4258870B2 - Solar cell sealing film and solar cell - Google Patents
Solar cell sealing film and solar cell Download PDFInfo
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- JP4258870B2 JP4258870B2 JP35933498A JP35933498A JP4258870B2 JP 4258870 B2 JP4258870 B2 JP 4258870B2 JP 35933498 A JP35933498 A JP 35933498A JP 35933498 A JP35933498 A JP 35933498A JP 4258870 B2 JP4258870 B2 JP 4258870B2
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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
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Description
【０００１】
【発明の属する技術分野】
本発明はシランカップリング剤を含むＥＶＡ（エチレン−酢酸ビニル共重合体）樹脂組成物等の透明軟質樹脂組成物を成膜してなる太陽電池用封止膜及びこの封止膜を用いた太陽電池に係り、特に、シランカップリング剤の析出の問題がなく、接着性能の経時劣化の問題のない太陽電池用封止膜及びこの太陽電池用封止膜を用いた、耐候性、耐久性等に優れる太陽電池に関する。
【０００２】
【従来の技術】
近年、資源の有効利用や環境汚染の防止等の面から、太陽光を直接電気エネルギーに変換する太陽電池が注目され、開発が進められている。
【０００３】
太陽電池は、一般に、図１に示す如く、表面側透明保護部材としてのガラス基板１と裏面側保護部材（バックカバー）２との間にＥＶＡフィルム３Ａ，３Ｂの封止膜により、シリコン発電素子４等の太陽電池用セルを封止した構成とされている。
【０００４】
このような太陽電池は、ガラス基板１、封止膜用ＥＶＡフィルム３Ａ、シリコン発電素子４、封止膜用ＥＶＡフィルム３Ｂ及びバックカバー２をこの順で積層し、加熱加圧して、ＥＶＡを架橋硬化させて接着一体化することにより製造される。
【０００５】
ところで、このような太陽電池にあっては、機械的な耐久性の確保の面からも、また、湿気ないし水の透過による内部の導線や電極の発錆を防止する面からも、封止膜用ＥＶＡフィルム３Ａ，３Ｂにより、高度な密着性及び接着強度で各部材が接着一体化されていることが極めて重要な要件となる。
【０００６】
従来、この封止膜用ＥＶＡフィルム３Ａ，３Ｂとしては、ＥＶＡ樹脂に架橋剤、シランカップリング剤、架橋助剤、その他、必要に応じて安定化剤、着色剤、紫外線吸収剤、老化防止剤、変色防止剤等を配合してなるＥＶＡ樹脂組成物をＴダイ法により成膜したものが用いられている。このＥＶＡ樹脂組成物において、架橋剤は樹脂に架橋構造を持たせて耐候性を向上させるために、シランカップリング剤は接着力を向上させるために、また、架橋助剤はＥＶＡ樹脂のゲル分率を高めて耐久性を向上させるために配合される。
【０００７】
ＥＶＡ樹脂への上記添加剤のうち、シランカップリング剤としては従来、下記構造式［２］で表されるγ−メタクリロキシプロピルトリメトキシシランや、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といった、比較的低分子量のシラン化合物が用いられている。
【０００８】
【化２】
【発明が解決しようとする課題】
上述のような比較的低分子量のシランカップリング剤を配合したＥＶＡ樹脂組成物を成膜してなる従来の封止膜では、貯蔵時に経時によりフィルム表面にシランカップリング剤が析出して変性するために、、接着性能が低下するという欠点があった。そして、この接着性能の低下のために、従来の封止膜を用いた太陽電池では、十分に満足し得る耐候性、耐久性が得られず、性能の経時劣化の問題があった。
【００１０】
本発明は上記従来の問題点を解決し、シランカップリング剤を配合したＥＶＡ樹脂組成物を成膜してなる封止膜における貯蔵時のシランカップリング剤の析出に起因する接着性能の低下を防止して、接着性能を長期に亘り維持し得る太陽電池用封止膜、及びこのような封止膜を用いることにより、耐候性、耐久性及び性能の長期持続性に優れた太陽電池を提供することを目的とする。
【００１１】
【課題を解決するための手段】
本発明の太陽電池用封止膜は、シランカップリング剤を含むＥＶＡ樹脂組成物等の透明軟質樹脂組成物を成膜してなるシートで構成される太陽電池用封止膜において、該シランカップリング剤がポリシロキサン系化合物を含む太陽電池用封止膜であって、該ポリシロキサン系化合物が下記一般式［１］で表される化合物であることを特徴とする。
【００１２】
高分子量のポリシロキサン系化合物であれば、フィルム表面への析出の問題が殆どなく、接着性能を長期に亘り維持することが可能となる。
【００１４】
【化３】
（上記一般式［１］において、Ｍｅはメチル基を表し、Ｘはアルコキシ基を表し、Ｙはエポキシ基、カルボキシル基、カルビノール基、水酸基を表し、Ｚはポリエーテル基、アルキル基、アラルキル基を表す。）
本発明において、シランカップリング剤は、γ−メタクリロキシプロピルトリメトキシシラン等の分子内にＳｉ原子を１個のみ有するシランカップリング剤と、上記ポリシロキサン系化合物との混合物であっても良い。
【００１６】
また、透明軟質樹脂組成物の成膜シートは、その一方の面にフッ素フィルム、ポリエステルフィルム等を積層一体化して、太陽電池用封止膜としても良い。
【００１７】
本発明の太陽電池は、表面側透明保護部材と裏面側保護部材との間に封止膜を用いて太陽電池用セルを封止してなる太陽電池において、該封止膜として上記本発明の太陽電池用封止膜を用いたことを特徴とするものであって、接着性、密着性の経時劣化の問題がないことから、耐候性、耐久性及び性能の長期持続性に優れる。
【００１８】
【発明の実施の形態】
以下に本発明の実施の形態を詳細に説明する。
【００１９】
まず、本発明の太陽電池用封止膜の成膜材料のＥＶＡ樹脂組成物等の透明軟質樹脂組成物に配合されるシランカップリング剤について説明する。
【００２０】
本発明で用いるシランカップリング剤は、前記一般式［１］で表されるポリシロキサン系化合物である。
【００２１】
なお、前記一般式［１］において、Ｘのアルコキシ基としては、メトキシ基、エトキシ基、メトキシエトキシ基等が挙げられ、特にメトキシ基が好ましい。
【００２２】
本発明の太陽電池用封止膜の成膜原料のＥＶＡ樹脂組成物等の透明軟質樹脂組成物は、シランカップリング剤としてこのようなポリシロキサン系化合物を用いること以外は、通常の封止膜用樹脂組成物と同様にして調製することができる。
【００２３】
なお、ＥＶＡ樹脂組成物等の透明軟質樹脂組成物中の上記ポリシロキサン系化合物の配合割合は、ＥＶＡ樹脂等の樹脂１００重量部に対して５重量部以下、特に０．１〜１重量部とするのが好ましい。
【００２４】
以下に、本発明に好適なＥＶＡ樹脂について説明するに、このＥＶＡ樹脂は、メルトフローレートが０．７〜４０、特に１．５〜２０であることが好ましい。
【００２５】
本発明に係るＥＶＡ樹脂組成物には、耐候性の向上のために架橋剤を配合して架橋構造を持たせるが、この架橋剤としては、一般に、１００℃以上でラジカルを発生する有機過酸化物が用いられ、特に、配合時の安定性を考慮に入れれば、半減期１０時間の分解温度が７０℃以上であるものが好ましい。このような有機過酸化物としては、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）ヘキシン；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−ブチルパーオキシ）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ゾエート；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、一般にＥＶＡ樹脂１００重量部に対して５重量部以下、好ましくは１〜３重量部である。
【００２６】
本発明に係るＥＶＡ樹脂組成物には、ＥＶＡ樹脂のゲル分率を向上させ、耐久性を向上するためにＥＶＡ樹脂に架橋助剤を添加することができる。この目的に供さ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；トリアリルイソシアネート等の３官能の架橋助剤の他、ＮＫエステル等の単官能の架橋助剤等も挙げることができる。これらの架橋助剤の配合量は、一般にＥＶＡ樹脂１００重量部に対して１０重量部以下、好ましくは１〜５重量部である。
【００２７】
更に、ＥＶＡ樹脂の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などを添加することができ、これらの配合量は、一般にＥＶＡ樹脂１００重量部に対して５重量部以下である。
【００２８】
更に、必要に応じ、上記以外に着色剤、紫外線吸収剤、老化防止剤、変色防止剤等を添加することができる。着色剤の例としては、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、アヂ系、酸性又は塩基染料系レーキ等の有機顔料がある。紫外線吸収剤には、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−スルフォ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−ブチルフェニルサルシレート等のヒンダートアミン系がある。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；ヒンダートアミン系があり、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）セバケート等がある。
【００２９】
本発明の太陽電池用封止膜は、このようなＥＶＡ樹脂組成物等の透明軟質樹脂組成物を、常法に従ってＴダイ法、カレンダー法等により５０μｍ〜２ｍｍ程度の厚さに成膜することにより、容易に製造することができる。
【００３０】
本発明の太陽電池は、封止膜用ＥＶＡフィルム３Ａ，３Ｂとしてこの太陽電池用封止膜を用い、図１に示す如く、ガラス基板１、封止膜用ＥＶＡフィルム３Ａ、シリコン発電素子４、封止膜用ＥＶＡフィルム３Ｂ及びバックカバー２をこの順で積層し、積層体を常法に従って、真空ラミネーターで温度１２０〜１５０℃、脱気時間２〜１５分、プレス圧力０．５〜１ｋｇ／ｃｍ2、プレス時間８〜４５分で加熱加圧圧着することにより容易に製造することができる。
【００３１】
なお、ガラス基板１としては、一般に１〜１０ｍｍ程度の厚さのものが用いられる。また、バックカバー２としては金属板又はシート、更にはプラスチックフィルムであっても構わないが、その厚みが１００μｍ以下であることが好ましく、より好ましくは３０〜１００μｍである。プラスチックフィルムとしては、ポリエステルフィルム、ポリエチレンフィルム、ポリプロピレンフィルム、塩化ビニルフィルム等が挙げられるが、特にフッ素樹脂フィルムが耐候性の観点から好ましい。フッ素樹脂の種類としては一フッ化ポリエチレン、二フッ化ポリエチレン、三フッ化ポリエチレン、四フッ化ポリエチレン等が挙げられるが、一フッ化物が好ましい。
【００３２】
【実施例】
以下に実施例及び比較例を挙げて、本発明をより具体的に説明する。
【００３３】
実施例１
下記の成分を８０℃に加熱したロールミルにて混合することにより、下記配合のＥＶＡ樹脂組成物を調製し、このＥＶＡ樹脂組成物を９０℃に設定したプレスで０．６ｍｍ厚（１５０ｍｍ角）のシートとした。
【００３４】
［ＥＶＡ樹脂組成物配合：重量部］
ＥＶＡ樹脂（酢酸ビニル含有量２８重量％、メルトフローインデックス１８）
：１００
架橋剤（１，１−ビス（ｔ−ブチルパーオキシ）−３，３，５−トリメチルシクロヘキサン） ：２
ポリシロキサン系化合物（前記一般式［１］において、Ｘ＝アルコキシ基、Ｙ＝エポキシ基、Ｚ＝ポリエーテル基） ：０．５
紫外線吸収剤（２−ヒドロキシ−４−オクチルベンゾフェノン） ：０．３
得られたシートについて、ポリシロキサン系化合物の経時による析出状況をＥＶＡフィルム表面に析出するシランカップリング剤をＸ線マイクロアナライザーによるＳｉ量の定量により調べ、結果を表１に示した。
【００３５】
実施例２
実施例１において、ポリシロキサン系化合物として、前記一般式［１］において、Ｘ＝アルコキシ基、Ｚ＝ポリエーテル基のものを用いたこと以外は、全く同様にしてシートを作成し、その経時によるシランカップリング剤の析出状況を調べ、結果を表１に示した。
【００３６】
比較例１
実施例１において、シランカップリング剤としてポリシロキサン系化合物の代りに、前記構造式［２］で表されるγ−メタクリロキシプロピルトリメトキシシランを用いたこと以外は全く同様にしてシートを作成し、その経時によるシランカップリング剤の析出状況を調べ、結果を表１に示した。
【００３７】
【表１】
表１より、シランカップリング剤として本発明に係るポリシロキサン系化合物を用いることにより、シランカップリング剤の経時による析出を防止して、接着性を長期に亘り維持することができることがわかる。
【００３９】
【発明の効果】
以上詳述した通り、本発明の太陽電池用封止膜によれば、シランカップリング剤を配合したＥＶＡ樹脂組成物等の透明軟質樹脂組成物を成膜してなる封止膜における、シランカップリング剤の析出に起因する接着性能の低下を防止して、接着性能を長期に亘り維持することができる。また、本発明の太陽電池によれば、このような封止膜を用いることにより、耐候性、耐久性及び性能の長期持続性に優れた太陽電池を提供することができる。
【図面の簡単な説明】
【図１】一般的な太陽電池を示す断面図である。
【符号の説明】
１ ガラス基板
２ バックカバー
３Ａ，３Ｂ ＥＶＡフィルム
４ シリコン発電素子[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a solar cell sealing film formed by forming a transparent soft resin composition such as an EVA (ethylene-vinyl acetate copolymer) resin composition containing a silane coupling agent, and a solar cell using this sealing film. In particular, there is no problem of precipitation of the silane coupling agent, and there is no problem of deterioration of the adhesive performance over time, and weather resistance, durability, etc. using this solar cell sealing film. The present invention relates to an excellent solar cell.
[0002]
[Prior art]
In recent years, solar cells that directly convert sunlight into electric energy have attracted attention and are being developed from the viewpoint of effective use of resources and prevention of environmental pollution.
[0003]
As shown in FIG. 1, a solar cell generally includes a silicon power generation element using a sealing film of EVA films 3 </ b> A and 3 </ b> B between a glass substrate 1 as a front surface side transparent protective member and a back surface side protective member (back cover) 2. It is set as the structure which sealed cells for solar cells, such as 4.
[0004]
In such a solar cell, the glass substrate 1, the sealing film EVA film 3A, the silicon power generation element 4, the sealing film EVA film 3B and the back cover 2 are laminated in this order, and heated and pressurized to cross-link the EVA. Manufactured by curing and adhesive integration.
[0005]
By the way, in such a solar cell, from the viewpoint of ensuring mechanical durability and also from the aspect of preventing rusting of internal conductors and electrodes due to permeation of moisture or water, the sealing film It is an extremely important requirement that the members are bonded and integrated with high adhesion and adhesive strength by the EVA films 3A and 3B.
[0006]
Conventionally, as the EVA films for sealing films 3A and 3B, EVA resins are cross-linking agents, silane coupling agents, cross-linking aids, and other stabilizers, colorants, UV absorbers, anti-aging agents as necessary. In addition, an EVA resin composition formed by blending an anti-discoloring agent or the like and formed into a film by a T-die method is used. In this EVA resin composition, the cross-linking agent gives the resin a cross-linked structure to improve the weather resistance, the silane coupling agent improves the adhesive strength, and the cross-linking auxiliary aids the gel component of the EVA resin. Formulated to increase the rate and improve durability.
[0007]
Among the above-mentioned additives to EVA resin, as silane coupling agents, conventionally, γ-methacryloxypropyltrimethoxysilane represented by the following structural formula [2], γ-chloropropyltrimethoxysilane, vinyltrichlorosilane, etc. A relatively low molecular weight silane compound is used.
[0008]
[Chemical formula 2]
[Problems to be solved by the invention]
In a conventional sealing film formed by forming an EVA resin composition containing a silane coupling agent having a relatively low molecular weight as described above, the silane coupling agent is deposited on the film surface over time during storage and denatures. For this reason, there is a drawback that the adhesive performance is lowered. And due to the deterioration of the adhesion performance, the conventional solar cell using the sealing film cannot obtain sufficiently satisfactory weather resistance and durability, and there is a problem of deterioration of performance over time.
[0010]
The present invention solves the above-mentioned conventional problems and reduces the adhesive performance due to precipitation of the silane coupling agent during storage in a sealing film formed by forming an EVA resin composition containing a silane coupling agent. Providing a solar cell sealing film capable of preventing and maintaining adhesive performance for a long period of time, and a solar cell excellent in weather resistance, durability and long-term sustainability of performance by using such a sealing film The purpose is to do.
[0011]
[Means for Solving the Problems]
The sealing film for solar cells of the present invention is a sealing film for solar cells composed of a sheet formed by forming a transparent soft resin composition such as an EVA resin composition containing a silane coupling agent. The ring agent is a solar cell sealing film containing a polysiloxane compound, and the polysiloxane compound is a compound represented by the following general formula [1] .
[0012]
If it is a high molecular weight polysiloxane compound, there is almost no problem of precipitation on the film surface, and it is possible to maintain the adhesive performance for a long period of time.
[0014]
[Chemical 3]
(In the above general formula [1], Me represents a methyl group, X represents an alkoxy group, Y represents an epoxy group, a carboxyl group, a carbinol group, or a hydroxyl group, and Z represents a polyether group, an alkyl group, or an aralkyl group. Represents.)
In the present invention, the silane coupling agent may be a mixture of a silane coupling agent having only one Si atom in the molecule such as γ-methacryloxypropyltrimethoxysilane and the polysiloxane compound.
[0016]
Moreover, the film-forming sheet | seat of a transparent soft resin composition is good also as a sealing film for solar cells by laminating | stacking and integrating a fluorine film, a polyester film, etc. on the one surface.
[0017]
The solar cell of the present invention is a solar cell in which a solar cell is sealed using a sealing film between a front surface side transparent protective member and a back surface side protective member. It is characterized by using a solar cell sealing film, and has no problem of deterioration of adhesiveness and adhesion over time, and is excellent in weather resistance, durability and long-term sustainability of performance.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail.
[0019]
First, the silane coupling agent mix | blended with transparent soft resin compositions, such as EVA resin composition of the film-forming material of the sealing film for solar cells of this invention, is demonstrated.
[0020]
Silane coupling agent used in the present invention is a polysiloxane compound represented by the front following general formula [1].
[0021]
In the general formula [1], examples of the alkoxy group for X include a methoxy group, an ethoxy group, and a methoxyethoxy group, and a methoxy group is particularly preferable.
[0022]
A transparent soft resin composition such as an EVA resin composition as a film forming raw material for a solar cell sealing film of the present invention is a normal sealing film except that such a polysiloxane compound is used as a silane coupling agent. It can be prepared in the same manner as the resin composition for use.
[0023]
The blending ratio of the polysiloxane compound in the transparent soft resin composition such as EVA resin composition is 5 parts by weight or less, particularly 0.1 to 1 part by weight with respect to 100 parts by weight of the resin such as EVA resin. It is preferable to do this.
[0024]
Hereinafter, the EVA resin suitable for the present invention will be described. The EVA resin preferably has a melt flow rate of 0.7 to 40, particularly 1.5 to 20.
[0025]
In order to improve weather resistance, the EVA resin composition according to the present invention is blended with a crosslinking agent to give a crosslinked structure, and as this crosslinking agent, generally, an organic peroxidation that generates radicals at 100 ° C. or higher. In particular, if the stability at the time of blending is taken into consideration, it is preferable that the decomposition temperature with a half-life of 10 hours is 70 ° C. or higher. Examples of such an organic peroxide include 2,5-dimethylhexane; 2,5-dihydroperoxide; 2,5-dimethyl-2,5-di (t-butylperoxy) hexane; -T-butyl peroxide; t-dicumyl peroxide; 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne; dicumyl peroxide; α, α'-bis (t-butylperoxide Oxyisopropyl) 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-butylperoxy) 3,3,5-trimethylcyclohexane; t-butylperoxybenzoate; benzoyl peroxide, etc. Kill. The compounding amount of these organic peroxides is generally 5 parts by weight or less, preferably 1 to 3 parts by weight with respect to 100 parts by weight of the EVA resin.
[0026]
In the EVA resin composition according to the present invention, a crosslinking aid can be added to the EVA resin in order to improve the gel fraction of the EVA resin and improve the durability. Examples of crosslinking aids provided for this purpose include trifunctional crosslinking aids such as triallyl isocyanurate; triallyl isocyanate as well as monofunctional crosslinking aids such as NK esters. it can. The amount of these crosslinking aids is generally 10 parts by weight or less, preferably 1 to 5 parts by weight with respect to 100 parts by weight of the EVA resin.
[0027]
Furthermore, hydroquinone; hydroquinone monomethyl ether; p-benzoquinone; methyl hydroquinone, etc. can be added for the purpose of improving the stability of the EVA resin, and the blending amount thereof is generally 5 parts by weight with respect to 100 parts by weight of the EVA resin. It is as follows.
[0028]
Furthermore, if necessary, a colorant, an ultraviolet absorber, an anti-aging agent, a discoloration preventing agent and the like can be added in addition to the above. Examples of the colorant include inorganic pigments such as metal oxides and metal powders, and organic pigments such as azo-based, phthalocyanine-based, additive-based, acidic or basic dye-based lakes. Examples of ultraviolet absorbers include 2-hydroxy-4-octoxybenzophenone; benzophenones such as 2-hydroxy-4-methoxy-5-sulfobenzophenone; 2- (2′-hydroxy-5-methylphenyl) benzotriazole Benzotriazoles; phenyl salsylates; hindered amines such as pt-butylphenyl salsylates. Antiaging agents include amines; phenols; bisphenyls; hindered amines, such as di-t-butyl-p-cresol; bis (2,2,6,6-tetramethyl-4-piperazyl). ) Sebacate.
[0029]
The sealing film for solar cells of the present invention is formed by forming a transparent soft resin composition such as an EVA resin composition to a thickness of about 50 μm to 2 mm by a T-die method, a calendar method, or the like according to a conventional method. Thus, it can be easily manufactured.
[0030]
The solar cell of the present invention uses this solar cell sealing film as the sealing film EVA films 3A and 3B. As shown in FIG. 1, the glass substrate 1, the sealing film EVA film 3A, the silicon power generation element 4, The sealing film EVA film 3B and the back cover 2 are laminated in this order, and the laminate is subjected to a vacuum laminator at a temperature of 120 to 150 ° C., a degassing time of 2 to 15 minutes, and a press pressure of 0.5 to 1 kg / kg in accordance with a conventional method. It can be easily manufactured by heat-pressure bonding with cm 2 and a pressing time of 8 to 45 minutes.
[0031]
The glass substrate 1 generally has a thickness of about 1 to 10 mm. The back cover 2 may be a metal plate or sheet, or a plastic film, but the thickness is preferably 100 μm or less, more preferably 30 to 100 μm. Examples of the plastic film include a polyester film, a polyethylene film, a polypropylene film, and a vinyl chloride film. A fluororesin film is particularly preferable from the viewpoint of weather resistance. Examples of the fluororesin include monofluoropolyethylene, difluoropolyethylene, trifluoride polyethylene, and tetrafluoropolyethylene, and monofluoride is preferable.
[0032]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples.
[0033]
Example 1
By mixing the following components in a roll mill heated to 80 ° C., an EVA resin composition having the following composition was prepared, and this EVA resin composition was 0.6 mm thick (150 mm square) with a press set at 90 ° C. A sheet was used.
[0034]
[EVA resin composition blend: parts by weight]
EVA resin (vinyl acetate content 28% by weight, melt flow index 18)
: 100
Cross-linking agent (1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane): 2
Polysiloxane compound (in the general formula [1], X = alkoxy group, Y = epoxy group, Z = polyether group): 0.5
Ultraviolet absorber (2-hydroxy-4-octylbenzophenone): 0.3
About the obtained sheet | seat, the silane coupling agent which deposits the polysiloxane type compound with time to the EVA film surface was investigated by determination of the amount of Si by the X-ray microanalyzer, and the result was shown in Table 1.
[0035]
Example 2
In Example 1, a sheet was prepared in exactly the same manner as in the above general formula [1] except that X = alkoxy group and Z = polyether group were used as the polysiloxane compound. The deposition state of the silane coupling agent was examined, and the results are shown in Table 1.
[0036]
Comparative Example 1
In Example 1, a sheet was prepared in exactly the same manner except that γ-methacryloxypropyltrimethoxysilane represented by the structural formula [2] was used instead of the polysiloxane compound as the silane coupling agent. The deposition state of the silane coupling agent over time was examined, and the results are shown in Table 1.
[0037]
[Table 1]
From Table 1, it can be seen that by using the polysiloxane compound according to the present invention as the silane coupling agent, precipitation of the silane coupling agent with time can be prevented and the adhesiveness can be maintained for a long time.
[0039]
【The invention's effect】
As described above in detail, according to the sealing film for solar cells of the present invention, the silane cup in the sealing film formed by forming a transparent soft resin composition such as an EVA resin composition containing a silane coupling agent. It is possible to prevent the adhesion performance from being deteriorated due to the precipitation of the ring agent and maintain the adhesion performance for a long period of time. Moreover, according to the solar cell of this invention, the solar cell excellent in the weather resistance, durability, and long-term sustainability of performance can be provided by using such a sealing film.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a general solar cell.
[Explanation of symbols]
1 Glass substrate 2 Back cover 3A, 3B EVA film 4 Silicon power generation element
Claims (4)
該ポリシロキサン系化合物が下記一般式［１］で表される化合物であることを特徴とする太陽電池用封止膜。
The sealing film for solar cells, wherein the polysiloxane compound is a compound represented by the following general formula [1] .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35933498A JP4258870B2 (en) | 1998-12-17 | 1998-12-17 | Solar cell sealing film and solar cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35933498A JP4258870B2 (en) | 1998-12-17 | 1998-12-17 | Solar cell sealing film and solar cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000183382A JP2000183382A (en) | 2000-06-30 |
| JP4258870B2 true JP4258870B2 (en) | 2009-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35933498A Expired - Fee Related JP4258870B2 (en) | 1998-12-17 | 1998-12-17 | Solar cell sealing film and solar cell |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10394373B4 (en) * | 2002-12-16 | 2016-06-02 | Dai Nippon Printing Co., Ltd. | Intermediate foil for a solar cell module and solar cell module, in which the intermediate foil is used |
| CN100481524C (en) | 2003-09-10 | 2009-04-22 | 大日本印刷株式会社 | Encapsulant layer for solar battery assembly and solar battery assembly |
| JP5034175B2 (en) * | 2005-05-23 | 2012-09-26 | 凸版印刷株式会社 | Solar cell module |
| US20080276983A1 (en) * | 2005-11-04 | 2008-11-13 | Robert Andrew Drake | Encapsulation of Photovoltaic Cells |
| JP4663664B2 (en) * | 2006-03-30 | 2011-04-06 | 三洋電機株式会社 | Solar cell module |
| EP2355163B1 (en) | 2008-11-12 | 2013-09-18 | Bridgestone Corporation | Solar cell sealing film and solar cell using same |
| JP2010186932A (en) * | 2009-02-13 | 2010-08-26 | Tosoh Corp | Surface protection sheet for solar cell and solar cell using the same |
| KR20120099091A (en) * | 2009-11-27 | 2012-09-06 | 바스프 에스이 | Photovoltaic module with uv-stabilized encapsulant |
| JP5591564B2 (en) * | 2010-03-12 | 2014-09-17 | 株式会社ブリヂストン | Solar cell sealing film and solar cell using the same |
| TWI395806B (en) | 2010-04-14 | 2013-05-11 | Ind Tech Res Inst | Encapsulation material |
| KR101268278B1 (en) | 2010-10-18 | 2013-06-04 | 도레이첨단소재 주식회사 | Encapsulation composition for a solarcell module having an improved durability and the encapsulation sheet using the same |
| JP5778441B2 (en) | 2011-02-22 | 2015-09-16 | 株式会社ブリヂストン | Solar cell sealing film and solar cell using the same |
| JP5726568B2 (en) * | 2011-02-23 | 2015-06-03 | 株式会社ブリヂストン | Solar cell sealing film and solar cell using the same |
| JP6038919B2 (en) * | 2012-07-25 | 2016-12-07 | リンテック株式会社 | Protective film forming layer, protective film forming sheet, and method of manufacturing semiconductor device |
| US12006460B2 (en) | 2021-12-30 | 2024-06-11 | Industrial Technology Research Institute | Photoelectric conversion compound and photoelectric conversion composition including the same |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5823870A (en) * | 1981-08-03 | 1983-02-12 | Du Pont Mitsui Polychem Co Ltd | Bonding method of protective material for solar cell to filler |
| JPS60253253A (en) * | 1984-05-29 | 1985-12-13 | Toppan Printing Co Ltd | Back protective sheet for solar cell module |
| US5447576A (en) * | 1992-08-03 | 1995-09-05 | Siemens Solar Industries International, Inc. | Composition and method for encapsulating a solar cell which minimizes thermal discoloration |
| KR100236283B1 (en) * | 1993-09-30 | 1999-12-15 | 미다라이 후지오 | Solar cell module having a surface coating material of three-layered structure |
| JP3454585B2 (en) * | 1994-11-15 | 2003-10-06 | 積水化学工業株式会社 | Encapsulation materials for solar cells |
| JP3687701B2 (en) * | 1995-05-08 | 2005-08-24 | 株式会社ブリヂストン | Solar cell module |
| JP3701398B2 (en) * | 1996-07-12 | 2005-09-28 | 大日本印刷株式会社 | Transparent composite film |
| JPH10195200A (en) * | 1997-01-13 | 1998-07-28 | Toagosei Co Ltd | Production of organosilicon compound and silane coupling agent |
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