JP2013232498A - Solar cell sealing sheet and method for producing the same, and solar cell module and method for manufacturing the same - Google Patents

Solar cell sealing sheet and method for producing the same, and solar cell module and method for manufacturing the same Download PDF

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JP2013232498A
JP2013232498A JP2012103309A JP2012103309A JP2013232498A JP 2013232498 A JP2013232498 A JP 2013232498A JP 2012103309 A JP2012103309 A JP 2012103309A JP 2012103309 A JP2012103309 A JP 2012103309A JP 2013232498 A JP2013232498 A JP 2013232498A
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solar cell
sealing sheet
ethylene copolymer
mass
ethylene
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Masaru Tanabe
田邉  勝
Katsuhiko Shimizu
克彦 清水
Jun Tokuhiro
淳 徳弘
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Mitsui Chemicals Tohcello Inc
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Mitsui Chemicals Tohcello Inc
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    • YGENERAL 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
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Abstract

PROBLEM TO BE SOLVED: To provide: a solar cell sealing sheet suppressing a back face side sealing material from creeping, and a method for producing the solar cell sealing sheet; and a solar cell module in which the sealing sheet is used, and a method for manufacturing the solar cell module.SOLUTION: There is provided a solar cell sealing sheet which is used on a back face side of a power generation element of a solar cell module, and comprises a resin composition including: 50-90 pts.mass of an ethylene copolymer (A) having a melt flow rate of 10-35 g/10 min; 1-50 pts.mass of an ethylene copolymer (B) having a melt flow rate of 1 g/10 min or more and less than 10 g/10 min; [where, the total of the ethylene copolymers (A) and (B) is 100 pts.mass]; and a coloring agent (C). There are also provided a method for producing the solar cell sealing sheet, a solar cell module in which the sealing sheet is used, and a method for manufacturing the solar cell module.

Description

本発明は、太陽電池封止シート及びその製造方法、並びにこの封止シートを用いた太陽電池モジュール及びその製造方法に関する。   The present invention relates to a solar cell encapsulating sheet and a manufacturing method thereof, and a solar cell module using the encapsulating sheet and a manufacturing method thereof.

従来より、太陽電池の発電効率向上の為に、入射した光をできるだけ効率良く太陽電池用発電素子に集光することが求められている。したがって、表面側(受光面側)の封止材は、できるだけ高い透明性を有し、入射した光を吸収したり反射したりすること無く透過させるものが望ましい。   Conventionally, in order to improve the power generation efficiency of a solar cell, it has been required to concentrate incident light on the solar cell power generation element as efficiently as possible. Therefore, it is desirable that the sealing material on the front surface side (light receiving surface side) has as high transparency as possible and allows incident light to pass through without being absorbed or reflected.

一方、裏面側(受光面の反対側)の封止材としては、二酸化チタン等の白色着色剤を配合し、裏面と表面との界面における光の反射や着色剤による光の乱反射によって、複数の太陽電池用素子の間に入射した光や太陽電池用素子を透過した光を反射させ、光の利用効率を高める封止材料が開発されている(例えば特許文献1〜3)。   On the other hand, as a sealing material on the back surface side (opposite the light receiving surface), a white colorant such as titanium dioxide is blended, and a plurality of light reflections at the interface between the back surface and the front surface or irregular reflection of light by the colorant are used. Sealing materials that reflect light incident between solar cell elements and light transmitted through the solar cell elements to improve the light utilization efficiency have been developed (for example, Patent Documents 1 to 3).

一般に太陽電池モジュールは、表面側透明保護部材、表面側封止材、太陽電池用セル、裏面側封止材及び裏面側保護部材(バックシート)をこの順で積層した積層体を、減圧下で脱気し、加熱加圧して接着一体化することにより製造されている。この工程において、溶融した裏面側封止材が流動し、積層体の側面や太陽電池用セル間の隙間から表面側(受光面側)に回り込み、太陽電池用セルと表面側封止材との間に侵入する場合がある。特に裏面側封止材が着色した材料からなる場合は、この裏面側封止材の回り込みによって発電効率の低下や外観不良が起こる場合がある。   In general, a solar cell module is a laminated body in which a surface-side transparent protective member, a surface-side sealing material, a solar cell, a back-side sealing material, and a back-side protection member (back sheet) are laminated in this order under reduced pressure. It is manufactured by degassing, heat-pressing, and bonding and integrating. In this step, the melted back surface side sealing material flows, wraps around the surface side (light receiving surface side) from the gap between the side surfaces of the laminated body and the solar cell, and the solar cell and the surface side sealing material There may be intrusions in between. In particular, when the back surface side sealing material is made of a colored material, the power generation efficiency may be lowered or the appearance may be deteriorated due to the back surface side sealing material.

このような現象を防止する為に、特許文献1では、14g/10min以下のメルトフローレートを有する封止膜が提案されている。また特許文献2では、着色した裏面側封止膜のエチレン−酢酸ビニル共重合体(EVA)の酢酸ビニル含有量よりも、透明な表面側封止膜のEVAの酢酸ビニル含有量を高くした太陽電池が提案されている。また特許文献3では着色した裏面側封止膜のEVAのメルトフローレートよりも、透明な表面側封止膜のEVAのメルトフローレートを高くした太陽電池が提案されている。また特許文献4では、太陽電池用セルと着色した裏面側封止材との間に、さらに透明な封止材層を設ける事により着色した裏面側封止材の回り込みを防止している。   In order to prevent such a phenomenon, Patent Document 1 proposes a sealing film having a melt flow rate of 14 g / 10 min or less. Moreover, in patent document 2, the sun which increased the vinyl acetate content of EVA of the transparent surface side sealing film higher than the vinyl acetate content of the ethylene-vinyl acetate copolymer (EVA) of the colored back surface sealing film Batteries have been proposed. Patent Document 3 proposes a solar cell in which the EVA melt flow rate of the transparent front side sealing film is higher than the EVA melt flow rate of the colored back side sealing film. Moreover, in patent document 4, the surroundings of the colored back surface side sealing material is prevented by providing a transparent sealing material layer between the solar cell and the colored back surface side sealing material.

しかしながら、特許文献1〜3の方法では、製造工程における加熱加圧条件によっては、上記の現象を防止できない場合がある。また特許文献4の方法では、裏面側封止材として透明層と着色層の2層を設ける必要があり、製造負荷やコスト増を招いてしまう。   However, in the methods of Patent Documents 1 to 3, the above phenomenon may not be prevented depending on the heating and pressing conditions in the manufacturing process. Moreover, in the method of patent document 4, it is necessary to provide two layers, a transparent layer and a colored layer, as a back surface side sealing material, resulting in an increase in manufacturing load and cost.

特開平6−177412号公報Japanese Patent Laid-Open No. 6-177412 特開2003−258283号公報JP 2003-258283 A 特開2005−050928号公報Japanese Patent Laying-Open No. 2005-050928 特開2011−216804号公報JP 2011-216804 A

本発明は上記の課題を鑑みてなされたものであって、裏面側封止材の回り込みを低減した太陽電池封止シート及びその製造方法、並びにこの封止シートを用いた太陽電池モジュール及びその製造方法を提供することを目的とする。   The present invention has been made in view of the above-described problems, and is a solar cell encapsulating sheet in which the wraparound of the back surface side sealing material is reduced, a method for producing the same, and a solar cell module using the encapsulating sheet and the production thereof. It aims to provide a method.

本発明は、太陽電池モジュールの発電素子の裏面側に用いられる太陽電池封止シートであって、メルトフローレートが10〜35g/10分であるエチレン共重合体(A)50〜90質量部と、メルトフローレートが1g/10分以上、10g/10分未満であるエチレン共重合体(B)1〜50質量部と[但しエチレン共重合体(A)及び(B)の合計100質量部]、着色剤(C)と、を含む樹脂組成物からなる太陽電池封止シートである。   This invention is a solar cell sealing sheet used for the back surface side of the electric power generating element of a solar cell module, Comprising: 50-90 mass parts of ethylene copolymers (A) whose melt flow rate is 10-35 g / 10min, 1 to 50 parts by mass of an ethylene copolymer (B) having a melt flow rate of 1 g / 10 minutes or more and less than 10 g / 10 minutes [provided that 100 parts by mass in total of the ethylene copolymers (A) and (B)] And a solar cell encapsulating sheet comprising a resin composition containing a colorant (C).

また本発明は、受光側保護部材と、受光側封止シートと、発電素子と、上記の太陽電池封止シートと、裏面側保護部材とをこの順に積層してなる太陽電池モジュールである。   Moreover, this invention is a solar cell module formed by laminating | stacking the light reception side protection member, the light reception side sealing sheet, the electric power generating element, said solar cell sealing sheet, and a back surface side protection member in this order.

また本発明は、受光側保護部材と、受光側封止シートと、発電素子と、上記の太陽電池封止シートと、裏面側保護部材とをこの順に重ねて、加熱圧着して積層体を得る工程を有する太陽電池モジュールの製造方法である。   In the present invention, the light-receiving side protective member, the light-receiving side sealing sheet, the power generation element, the solar cell sealing sheet, and the back surface-side protective member are stacked in this order, and heat-pressed to obtain a laminate. It is a manufacturing method of the solar cell module which has a process.

また本発明は、上記の太陽電池封止シートを製造する為の方法であって、エチレン共重合体(A)と、エチレン共重合体(B)と、エチレン共重合体(A)及び着色剤(C)からなるマスターバッチとを含む樹脂組成物を溶融混錬し、押出成形する工程を有する太陽電池封止シートの製造方法である。   Moreover, this invention is a method for manufacturing said solar cell sealing sheet, Comprising: An ethylene copolymer (A), an ethylene copolymer (B), an ethylene copolymer (A), and a coloring agent It is a manufacturing method of the solar cell sealing sheet which has the process of melt-kneading and extruding the resin composition containing the masterbatch which consists of (C).

本発明の太陽電池封止シートを裏面側封止材として使用すれば、各構成要素を加熱圧着して積層体を得る工程において、裏面側封止材が積層体の側面やセル間の隙間から表面側(受光面側)に回り込む事を抑制でき、その結果、発電効率の低下や外観不良を防止できる。また、本発明の製造方法は、そのような優れた太陽電池封止シートを簡易且つ効率的に製造できる方法である。   If the solar cell encapsulating sheet of the present invention is used as a back side sealing material, in the step of thermocompression bonding each component to obtain a laminate, the back side sealing material is removed from the side surface of the laminate or the gap between cells. It is possible to suppress wrapping around the surface side (light-receiving surface side), and as a result, it is possible to prevent a decrease in power generation efficiency and appearance defects. Moreover, the manufacturing method of this invention is a method which can manufacture such an excellent solar cell sealing sheet simply and efficiently.

本発明の太陽電池モジュールは、そのような発電効率の低下や外観不良が防止された太陽電池モジュールである。また、本発明の太陽電池モジュールの製造方法は、そのような優れた太陽電池モジュールを簡易且つ効率的に製造できる方法である。   The solar cell module of the present invention is a solar cell module in which such reduction in power generation efficiency and appearance failure are prevented. Moreover, the manufacturing method of the solar cell module of this invention is a method which can manufacture such an outstanding solar cell module simply and efficiently.

[エチレン共重合体(A)及び(B)]
本発明に用いるエチレン共重合体(A)のメルトフローレート(以下「MFR」と称す)は10〜35g/10分であり、好ましくは10〜25g/10分である。また、エチレン共重合体(B)のMFRは1g/10分以上、10g/10分未満であり、好ましくは5〜9g/10分である。このMFRは、JIS K−7210に準拠し、190℃、2.16kg荷重の条件で測定した値である。
[Ethylene copolymers (A) and (B)]
The melt flow rate (hereinafter referred to as “MFR”) of the ethylene copolymer (A) used in the present invention is 10 to 35 g / 10 minutes, preferably 10 to 25 g / 10 minutes. Moreover, MFR of ethylene copolymer (B) is 1 g / 10min or more and less than 10g / 10min, Preferably it is 5-9g / 10min. This MFR is a value measured in accordance with JIS K-7210 under the conditions of 190 ° C. and 2.16 kg load.

エチレン共重合体(A)及び(B)はエチレンと他のモノマーとの共重合体であり、エチレン−極性モノマー共重合体が好ましい。その具体例としては、エチレン−酢酸ビニル共重合体、エチレン−(メタ)アクリル酸共重合体、エチレン系アイオノマーが挙げられる。中でも、エチレン−酢酸ビニル共重合体が特に好ましい。また、エチレン−酢酸ビニル共重合体の酢酸ビニル含量は、エチレン及び酢酸ビニルの合計含量を100質量%として、好ましくは10〜40質量%である。   The ethylene copolymers (A) and (B) are copolymers of ethylene and other monomers, and ethylene-polar monomer copolymers are preferred. Specific examples thereof include an ethylene-vinyl acetate copolymer, an ethylene- (meth) acrylic acid copolymer, and an ethylene ionomer. Among these, an ethylene-vinyl acetate copolymer is particularly preferable. The vinyl acetate content of the ethylene-vinyl acetate copolymer is preferably 10 to 40% by mass, with the total content of ethylene and vinyl acetate being 100% by mass.

[着色剤(C)]
本発明に用いる着色剤(C)は、無機又は有機微粒子であり、例えば白色、黒色ないし青や赤等に着色するため太陽電池封止シートに配合される。
[Colorant (C)]
The colorant (C) used in the present invention is inorganic or organic fine particles, and is blended in the solar cell encapsulating sheet in order to color, for example, white, black, blue or red.

着色剤(C)の例を示すと、炭酸カルシウム、二酸化チタン等の白色着色剤は、入射した光を反射させ、光の利用効率を高めるのに用いられる。同じ白色である水酸化マグネシウムは、難燃剤として配合することができる。またカーボンブラック等の黒色着色剤は、パネルの意匠性を高めるのに用いることができる。他にウルトラマリンブルー、ウルトラマリンレッド等も使用することができる。   As an example of the colorant (C), white colorants such as calcium carbonate and titanium dioxide are used to reflect incident light and increase the light use efficiency. Magnesium hydroxide, which is the same white, can be blended as a flame retardant. A black colorant such as carbon black can be used to enhance the design of the panel. In addition, ultramarine blue, ultramarine red, and the like can be used.

本発明に用いる着色剤(C)は、炭酸カルシウム、硫酸バリウム、酸化亜鉛及び二酸化チタンからなる群より選ばれる白色着色剤が好ましく、特に二酸化チタンが好ましい。   The colorant (C) used in the present invention is preferably a white colorant selected from the group consisting of calcium carbonate, barium sulfate, zinc oxide and titanium dioxide, and particularly preferably titanium dioxide.

着色剤の配合量は、エチレン共重合体(A)及び(B)100質量部に対して、好ましくは0.1〜10質量部、より好ましくは0.1〜5質量部である。   The blending amount of the colorant is preferably 0.1 to 10 parts by mass, more preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of the ethylene copolymers (A) and (B).

[樹脂組成物]
本発明に用いる樹脂組成物は、以上説明したエチレン共重合体(A)50〜90質量部と、エチレン共重合体(B)1〜50質量部と[但しエチレン共重合体(A)及び(B)の合計100質量部]、着色剤(C)とを含む。
[Resin composition]
The resin composition used in the present invention is composed of 50 to 90 parts by mass of the ethylene copolymer (A) described above, 1 to 50 parts by mass of the ethylene copolymer (B) [provided that the ethylene copolymer (A) and ( 100 parts by mass in total of B)] and the colorant (C).

エチレン共重合体(A)及び(B)をこのような範囲で用いる事により、樹脂成分、すなわちエチレン共重合体(A)及び(B)の混合物のMFRを簡易且つ効率良く調整できる。エチレン共重合体(A)及び(B)からなる混合物のMFRは、好ましくは5〜15g/10分、より好ましくは7〜12g/10分である。   By using the ethylene copolymers (A) and (B) in such a range, the MFR of the resin component, that is, the mixture of the ethylene copolymers (A) and (B) can be adjusted easily and efficiently. The MFR of the mixture comprising the ethylene copolymers (A) and (B) is preferably 5 to 15 g / 10 minutes, more preferably 7 to 12 g / 10 minutes.

エチレン共重合体(A)及び(B)としてエチレン−酢酸ビニル共重合体を用いる場合、樹脂組成物の酢酸ビニル含量は、エチレン及び酢酸ビニルの合計含量を100質量%として、好ましくは25〜35質量%である。   When an ethylene-vinyl acetate copolymer is used as the ethylene copolymers (A) and (B), the vinyl acetate content of the resin composition is preferably 25 to 35, with the total content of ethylene and vinyl acetate being 100% by mass. % By mass.

この樹脂組成物を製造する為には、各成分(A)〜(C)をそのまま混合しても良い。ただし着色剤(C)を均一に分散する点から、まずエチレン共重合体(A)及び着色剤(C)からなるマスターバッチ(MB)を作製し、エチレン共重合体(A)及び(B)からなる組成物に対してこのMBを配合する方法が好ましい。MB中の着色剤(C)の濃度及びMBの配合量は特に制限されず、得られる樹脂組成物中の各成分(A)〜(C)の配合量が先に説明した比率になるように適宜決定すれば良い。通常、MB中の着色剤(C)の濃度は好ましくは20〜60質量%である。そして、例えばMB中の着色剤(C)の濃度が50質量%の場合、エチレン共重合体(A)及び(B)からなる組成物に対するMBの配合量は、好ましくは5〜20質量部である。この樹脂組成物を、後述するように押出成形やカレンダ成形、特に押出成形により加工して樹脂シートを得る事が出来る。   In order to produce this resin composition, the components (A) to (C) may be mixed as they are. However, from the viewpoint of uniformly dispersing the colorant (C), first, a master batch (MB) comprising the ethylene copolymer (A) and the colorant (C) is prepared, and the ethylene copolymers (A) and (B). A method of blending this MB with a composition comprising: The concentration of the colorant (C) in MB and the blending amount of MB are not particularly limited, so that the blending amount of each component (A) to (C) in the obtained resin composition becomes the ratio described above. What is necessary is just to determine suitably. Usually, the concentration of the colorant (C) in MB is preferably 20 to 60% by mass. For example, when the concentration of the colorant (C) in MB is 50% by mass, the amount of MB to the composition comprising the ethylene copolymers (A) and (B) is preferably 5 to 20 parts by mass. is there. As will be described later, this resin composition can be processed by extrusion molding, calendar molding, particularly extrusion molding to obtain a resin sheet.

[架橋剤]
エチレン共重合体(A)及び(B)としてエチレン−酢酸ビニル共重合体を用いる場合、封止シートの耐熱性や耐久性を高める為に過酸化物等の架橋剤を配合する事が好ましい。架橋剤の具体例としては、ジラウロイルパーオキサイド、1,1,3,3−テトラメチルブチルパーオキシ−2−エチルヘキサノエート、ジベンゾイルパーオキサイド、シクロヘキサノンパーオキサイド、ジ−t−ブチルパーフタレート、クメンヒドロパーオキシド、t−ブチルヒドロパーオキシド、2,5−ジメチル−2,5−ジ(t−ブチルパーオキシ)ヘキセン、2,5−ジメチル−2,5−ジ(t−ブチルパーオキシ)ヘキサン、t−アミルパーオキシ−2−エチルヘキサノエート、t−ブチルパーオキシ−2−エチルヘキサノエート、t−ブチルパーオキシイソブチレート、t−ブチルパーオキシマレイン酸、1,1−ジ(t−アミルパーオキシ)−3,3,5−トリメチルシクロヘキサン、1,1−ジ(t−アミルパーオキシ)シクロヘキサン、t−アミルパーオキシイソノナノエート、t−アミルパーオキシノルマルオクトエート、1,1−ジ(t−ブチルパーオキシ)−3,3,5−トリメチルシクロヘキサン、1,1−ジ(t−ブチルパーオキシ)シクロヘキサン、t−ブチルパーオキシイソプロピルカーボネート、t−ブチルパーオキシ−2−エチルヘキシルカーボネート、2,5−ジメチル−2,5−ジ(ベンゾイルパーオキシ)ヘキサン、t−アミル−パーオキシベンゾエート、t−ブチルパーオキシアセテート、t−ブチルパーオキシイソノナノエート、t−ブチルパーオキシベンゾエート、2,2−ジ(ブチルパ−オキシ)ブタン、n−ブチル−4,4−ジ(t−ブチルパ−オキシ)プチレート、メチルエチルケトンパ−オキサイド、エチル3,3−ジ(t−ブチルパ−オキシ)ブチレート、ジクミルパ−オキサイド、t−ブチルクミルパ−オキサイド、t−ブチルパーオキシベンゾエート、ジ−t−ブチルパ−オキサイド、1,1,3,3−テトララメチルブチルハイドロパ−オキサイド、アセチルアセトンパ−オキサイド等の過酸化物が挙げられる。中でも、2,5−ジメチル−2,5−ジ(t−ブチルパーオキシ)ヘキセン、2,5−ジメチル−2,5−ジ(t−ブチルパーオキシ)ヘキサン、t−ブチルパーオキシ−2−エチルヘキシルカーボネート、t−ブチルパーオキシベンゾエートが好ましい。
[Crosslinking agent]
When an ethylene-vinyl acetate copolymer is used as the ethylene copolymers (A) and (B), it is preferable to add a crosslinking agent such as a peroxide in order to increase the heat resistance and durability of the sealing sheet. Specific examples of the crosslinking agent include dilauroyl peroxide, 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate, dibenzoyl peroxide, cyclohexanone peroxide, and di-t-butyl perphthalate. , Cumene hydroperoxide, t-butyl hydroperoxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexene, 2,5-dimethyl-2,5-di (t-butylperoxy) ) Hexane, t-amylperoxy-2-ethylhexanoate, t-butylperoxy-2-ethylhexanoate, t-butylperoxyisobutyrate, t-butylperoxymaleic acid, 1,1- Di (t-amylperoxy) -3,3,5-trimethylcyclohexane, 1,1-di (t-amylperoxy) cyclohexane t-amylperoxy isononanoate, t-amylperoxynormal octoate, 1,1-di (t-butylperoxy) -3,3,5-trimethylcyclohexane, 1,1-di (t-butylper) Oxy) cyclohexane, t-butylperoxyisopropyl carbonate, t-butylperoxy-2-ethylhexyl carbonate, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, t-amyl-peroxybenzoate, t -Butyl peroxyacetate, t-butyl peroxy isononanoate, t-butyl peroxybenzoate, 2,2-di (butyl peroxy) butane, n-butyl-4,4-di (t-butyl peroxy) Petitrate, methyl ethyl ketone peroxide, ethyl 3,3-di (t-butylperoxy) butyl Such as tyrate, dicumyl peroxide, t-butyl cumyl peroxide, t-butyl peroxybenzoate, di-t-butyl peroxide, 1,1,3,3-tetralamethylbutyl hydroperoxide, acetylacetone peroxide, etc. A peroxide is mentioned. Among them, 2,5-dimethyl-2,5-di (t-butylperoxy) hexene, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, t-butylperoxy-2- Ethyl hexyl carbonate and t-butyl peroxybenzoate are preferred.

架橋剤の配合量は、エチレン共重合体(A)及び(B)100質量部に対して、好ましくは0.1〜5.0質量部である。   The amount of the crosslinking agent is preferably 0.1 to 5.0 parts by mass with respect to 100 parts by mass of the ethylene copolymers (A) and (B).

[添加剤]
本発明の封止シートは、以上説明した各成分の他に、必要に応じて、架橋助剤、接着促進剤、紫外線吸収剤、光安定剤、酸化防止剤等の添加剤が含まれていてもよい。
[Additive]
The sealing sheet of the present invention contains additives such as a crosslinking aid, an adhesion promoter, an ultraviolet absorber, a light stabilizer, and an antioxidant as necessary in addition to the components described above. Also good.

架橋助剤の具体例としては、トリアリルイソシアヌレート、トリメタリルイソシアヌレート等のアリル基含有化合物が挙げられる。架橋助剤の配合量は、エチレン共重合体(A)及び(B)100質量部に対して、好ましくは10質量部以下である。   Specific examples of the crosslinking aid include allyl group-containing compounds such as triallyl isocyanurate and trimethallyl isocyanurate. The amount of the crosslinking aid is preferably 10 parts by mass or less with respect to 100 parts by mass of the ethylene copolymers (A) and (B).

接着促進剤の具体例としては、ビニルトリエトキシシラン、ビニルトリクロロシラン、ビニルトリス(β−メトキシ−エトキシ)シラン、β−(3,4−エポ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、γ−アミノプロピルトリエトキシシランが挙げられる。接着促進剤の配合量は、エチレン共重合体(A)及び(B)100質量部に対して、好ましくは5質量部以下である。   Specific examples of the adhesion promoter include vinyltriethoxysilane, vinyltrichlorosilane, vinyltris (β-methoxy-ethoxy) silane, β- (3,4-epoxycyclohexyl) -ethyltrimethoxysilane, γ-glycidoxypropyl. -Trimethoxysilane, (gamma) -aminopropyl triethoxysilane is mentioned. The blending amount of the adhesion promoter is preferably 5 parts by mass or less with respect to 100 parts by mass of the ethylene copolymers (A) and (B).

紫外線吸収剤の具体例としては、2−ヒドロキシ−4−メトキシベンゾフェノン、2,2−ジヒドロキシ−4−メトキシベンゾフェノン、2−ヒドロキシ−4−メトキシ−2−カルボキシベンゾフェノン、2−ヒドロキシ−4−n−オクトキシベンゾフェノン等のベンゾフェノン系化合物;2−(2−ヒドロキシ−3,5−ジ第3ブチルフェニル)ベンゾトリアゾール、2−(2−ヒドロキシ−5−メチルフェニル)ベンゾトリアゾール、2−(2−ヒドロキシ−5−第3オクチルフェニル)ベンゾトリアゾール等のベンゾトリアゾール系化合物;フェニルサリチレート、p−オクチルフェニルサリチレート等のサリチル酸エステル系化合物が挙げられる。光安定剤の具体例としては、ヒンダ−ドアミン系化合物が挙げられる。酸化防止剤の具体例としては、ヒンダ−ドフェノール系化合物やホスファイト系化合物が挙げられる。紫外線吸収剤、光安定剤、酸化防止剤は、本発明の目的及び効果を損なわない範囲の量で使用すればよい。   Specific examples of the ultraviolet absorber include 2-hydroxy-4-methoxybenzophenone, 2,2-dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-2-carboxybenzophenone, 2-hydroxy-4-n- Benzophenone compounds such as octoxybenzophenone; 2- (2-hydroxy-3,5-ditert-butylphenyl) benzotriazole, 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2- (2-hydroxy -5-Third octylphenyl) benzotriazole compounds such as benzotriazole; salicylic acid ester compounds such as phenyl salicylate and p-octylphenyl salicylate. Specific examples of the light stabilizer include hindered amine compounds. Specific examples of the antioxidant include hindered phenol compounds and phosphite compounds. What is necessary is just to use an ultraviolet absorber, a light stabilizer, and antioxidant in the quantity of the range which does not impair the objective and effect of this invention.

[太陽電池封止シート]
本発明の太陽電池封止シートは、太陽電池モジュールの発電素子の裏面側に用いられる封止シートである。発電素子の裏面側とは、発電素子に対して受光面側(表面側)とは反対側を意味する。封止シートの厚みは、好ましくは0.1〜2.0mmである。
[Solar cell sealing sheet]
The solar cell sealing sheet of this invention is a sealing sheet used for the back surface side of the electric power generation element of a solar cell module. The back surface side of the power generation element means a side opposite to the light receiving surface side (front surface side) with respect to the power generation element. The thickness of the sealing sheet is preferably 0.1 to 2.0 mm.

太陽電池封止シートの製造方法は、特に限定されない。例えば樹脂材料を、押出成形、カレンダ成形等によりシート状に加工して樹脂シートを得る事が出来る。なお、先に述べたようなマスターバッチを含む樹脂組成物を溶融混錬し、押出成形する方法が特に好ましい。   The manufacturing method of a solar cell sealing sheet is not specifically limited. For example, a resin sheet can be obtained by processing a resin material into a sheet by extrusion molding, calendar molding, or the like. In addition, the method of melt-kneading and extruding the resin composition containing the master batch as described above is particularly preferable.

[太陽電池モジュール]
本発明の太陽電池モジュールは、受光側保護部材(表面側透明保護部材等)と、受光側封止シートと、発電素子と、裏面側封止シート(本発明の太陽電池封止シート)と、裏面側保護部材(バックシート)とをこの順に積層してなる。
[Solar cell module]
The solar cell module of the present invention includes a light receiving side protection member (front surface side transparent protective member or the like), a light receiving side sealing sheet, a power generation element, a back surface side sealing sheet (solar cell sealing sheet of the present invention), A back surface side protection member (back sheet) is laminated in this order.

一般に、受光側封止シートは必要に応じて設けられるものであるが、受光側封止シートを設けた方が保護性能が高められるので好ましい。受光側封止シートは、通常、裏面側封止シートと同じ樹脂材料で構成されるが、異なる樹脂材料であっても良い。受光側封止シートは、透明性が要求されるので着色剤は含有しない。   Generally, the light-receiving side sealing sheet is provided as necessary, but it is preferable to provide the light-receiving side sealing sheet because the protection performance is improved. The light-receiving side sealing sheet is usually made of the same resin material as that of the back side sealing sheet, but may be a different resin material. Since the light-receiving side sealing sheet is required to be transparent, it does not contain a colorant.

受光側保護部材としては、耐久性や透明性の点から、通常はガラス材が用いられる。裏面側保護部材としては、樹脂シートやガラス材が用いられるが、特にポリエチレンテレフタレート(PET)系樹脂シートが好ましい。   As the light-receiving side protection member, a glass material is usually used from the viewpoint of durability and transparency. As the back surface side protective member, a resin sheet or a glass material is used, and a polyethylene terephthalate (PET) resin sheet is particularly preferable.

太陽電池モジュールは、受光側保護部材(表面側透明保護部材等)と、受光側封止シートと、発電素子と、裏面側封止シート(本発明の太陽電池封止シート)と、裏面側保護部材(バックシート)とをこの順に重ね加熱圧着して積層体を得る工程により、製造できる。その具体的な製造条件は特に限定されず、公知の方法に従えばよい。   The solar cell module includes a light receiving side protective member (front surface side transparent protective member, etc.), a light receiving side sealing sheet, a power generation element, a back surface side sealing sheet (a solar cell sealing sheet of the present invention), and a back surface side protection. The member (back sheet) can be manufactured by a process of stacking and pressing in this order to obtain a laminate. The specific production conditions are not particularly limited, and may be a known method.

以下、実施例により本発明を更に詳細に説明する。   Hereinafter, the present invention will be described in more detail with reference to examples.

<実施例1及び2、比較例1>
(太陽電池封止シートの作製)
(A)成分としてエチレン−酢酸ビニル共重合体(MFR=15g/10分、酢酸ビニル(VA)含量=28質量%)、(B)成分としてエチレン−酢酸ビニル共重合体(MFR=6g/10分、VA含量=28質量%)、(C)成分として二酸化チタンを用い、表1に示す組成比(質量部)の樹脂組成物を調製した。また(A)成分と(B)成分の混合物のMFRとVA含量も併せて表1に示す。これらの樹脂組成物の調製には、(A)成分及び着色剤(C)からなるマスターバッチ(着色剤(C)の濃度50質量%)を6質量部使用した。
<Examples 1 and 2, Comparative Example 1>
(Preparation of solar cell encapsulating sheet)
As the component (A), an ethylene-vinyl acetate copolymer (MFR = 15 g / 10 minutes, vinyl acetate (VA) content = 28% by mass), and as the component (B), an ethylene-vinyl acetate copolymer (MFR = 6 g / 10). And VA content = 28% by mass), and using titanium dioxide as the component (C), a resin composition having a composition ratio (parts by mass) shown in Table 1 was prepared. Table 1 also shows the MFR and VA contents of the mixture of component (A) and component (B). For preparing these resin compositions, 6 parts by mass of a masterbatch (concentration of the colorant (C) of 50% by mass) composed of the component (A) and the colorant (C) was used.

なおMFRは、JIS K−7210に準拠し、190℃、2.16kg荷重の条件で測定した。   In addition, MFR was measured on condition of 190 degreeC and a 2.16kg load based on JISK-7210.

次いで、各樹脂組成物を105℃で溶融混錬・押出成形して、厚さ0.45mmの裏面側封止シート1〜3(太陽電池封止シート)を得た。   Subsequently, each resin composition was melt-kneaded and extruded at 105 ° C. to obtain 0.45 mm thick backside sealing sheets 1 to 3 (solar cell sealing sheets).

Figure 2013232498
Figure 2013232498

(太陽電池モジュールの作製)
受光側保護部材(表面透明保護部材)として3.2mm厚のエンボスガラス、受光側封止シートとしてエチレン−酢酸ビニル共重合体(MFR=15g/10分、VA含量28質量%)を押出成形してなるシート、太陽電池用発電素子として0.3mm厚のセル、裏面側封止シートとして先に作製したシート1〜3、裏面側保護部材(バックシート)としてPET系樹脂シートをこの順で積層し、減圧下で脱気し、その後この積層体を加熱加圧することによって接着一体化し、太陽電池モジュールの各サンプルを得た。
(Production of solar cell module)
3.2mm thick embossed glass as the light-receiving side protective member (surface transparent protective member), and ethylene-vinyl acetate copolymer (MFR = 15g / 10min, VA content 28% by mass) as the light-receiving side sealing sheet are extruded. A sheet of 0.3 mm thick as a solar cell power generation element, sheets 1 to 3 previously prepared as a back side sealing sheet, and a PET resin sheet as a back side protection member (back sheet) in this order. Then, deaeration was performed under reduced pressure, and then the laminated body was bonded and integrated by heating and pressurizing to obtain each sample of the solar cell module.

(評価)
上記のように加熱加圧して各サンプルを作製した際に、溶融した裏面側封止シートが各サンプルのセルやバスバー電極に回り込んでいるかどうかを目視により確認し、回り込みに関して改善傾向が見られたものを「○」、回り込みが有ったものを「×」として評価を行った。評価結果を表2に示す。
(Evaluation)
When each sample was produced by heating and pressing as described above, it was confirmed by visual inspection whether the melted back side sealing sheet wraps around the cell or bus bar electrode of each sample. The evaluation was made with “○” as the sample and “×” as the sample with the wraparound. The evaluation results are shown in Table 2.

Figure 2013232498
Figure 2013232498

表2に示す様に、MFRが10〜35g/10分であるエチレン共重合体(A)のみを裏面側封止シートの樹脂成分として用いた比較例1よりも、MFRが10〜35g/10分であるエチレン共重合体(A)とMFRが1〜10g/10分であるエチレン共重合体(B)を併用した実施例1及び2の方が、回り込みに関して改善傾向が見られた。   As shown in Table 2, the MFR is 10 to 35 g / 10 than Comparative Example 1 in which only the ethylene copolymer (A) having an MFR of 10 to 35 g / 10 minutes is used as the resin component of the back side sealing sheet. In the cases of Examples 1 and 2 in which the ethylene copolymer (A) that is a minute and the ethylene copolymer (B) that has an MFR of 1 to 10 g / 10 minutes are used in combination, an improvement tendency in terms of wraparound was observed.

Claims (8)

太陽電池モジュールの発電素子の裏面側に用いられる太陽電池封止シートであって、
メルトフローレートが10〜35g/10分であるエチレン共重合体(A)50〜90質量部と、
メルトフローレートが1g/10分以上、10g/10分未満であるエチレン共重合体(B)1〜50質量部と[但しエチレン共重合体(A)及び(B)の合計100質量部]、
着色剤(C)と
を含む樹脂組成物からなる太陽電池封止シート。
A solar cell encapsulating sheet used on the back side of the power generation element of the solar cell module,
50 to 90 parts by mass of an ethylene copolymer (A) having a melt flow rate of 10 to 35 g / 10 minutes,
1 to 50 parts by mass of an ethylene copolymer (B) having a melt flow rate of 1 g / 10 min or more and less than 10 g / 10 min [provided that 100 parts by mass in total of the ethylene copolymers (A) and (B)]
The solar cell sealing sheet which consists of a resin composition containing a coloring agent (C).
エチレン共重合体(A)及び/又はエチレン共重合体(B)が、エチレン−酢酸ビニル共重合体である請求項1記載の太陽電池封止シート。   The solar cell encapsulating sheet according to claim 1, wherein the ethylene copolymer (A) and / or the ethylene copolymer (B) is an ethylene-vinyl acetate copolymer. 着色剤(C)が、炭酸カルシウム、硫酸バリウム、酸化亜鉛及び二酸化チタンからなる群より選ばれる白色着色剤である請求項1記載の太陽電池封止シート。   The solar cell encapsulating sheet according to claim 1, wherein the colorant (C) is a white colorant selected from the group consisting of calcium carbonate, barium sulfate, zinc oxide and titanium dioxide. 着色剤(C)が、二酸化チタンである請求項3記載の太陽電池封止シート。   The solar cell encapsulating sheet according to claim 3, wherein the colorant (C) is titanium dioxide. 受光側保護部材と、受光側封止シートと、発電素子と、請求項1記載の太陽電池封止シートと、裏面側保護部材とをこの順に積層してなる太陽電池モジュール。   A solar cell module obtained by laminating a light receiving side protective member, a light receiving side sealing sheet, a power generation element, the solar cell sealing sheet according to claim 1, and a back surface side protective member in this order. エチレン共重合体(A)と、エチレン共重合体(B)と、エチレン共重合体(A)及び着色剤(C)からなるマスターバッチとを含む樹脂組成物を溶融混錬し、押出成形する工程によって製造される請求項1記載の太陽電池封止シート。   A resin composition containing an ethylene copolymer (A), an ethylene copolymer (B), and a master batch composed of the ethylene copolymer (A) and a colorant (C) is melt-kneaded and extruded. The solar cell encapsulating sheet according to claim 1, which is produced by a process. 受光側保護部材と、受光側封止シートと、発電素子と、請求項1記載の太陽電池封止シートと、裏面側保護部材とをこの順に重ねて、加熱圧着して積層体を得る工程を有する太陽電池モジュールの製造方法。   A step of stacking the light-receiving side protective member, the light-receiving side sealing sheet, the power generation element, the solar cell sealing sheet according to claim 1 and the back-side protective member in this order, and thermocompression-bonding to obtain a laminate. The manufacturing method of the solar cell module which has. 請求項1記載の太陽電池封止シートを製造する為の方法であって、
エチレン共重合体(A)と、エチレン共重合体(B)と、エチレン共重合体(A)及び着色剤(C)からなるマスターバッチとを含む樹脂組成物を溶融混錬し、押出成形する工程を有する太陽電池封止シートの製造方法。
A method for producing the solar cell encapsulating sheet according to claim 1,
A resin composition containing an ethylene copolymer (A), an ethylene copolymer (B), and a master batch composed of the ethylene copolymer (A) and a colorant (C) is melt-kneaded and extruded. The manufacturing method of the solar cell sealing sheet which has a process.
JP2012103309A 2012-04-27 2012-04-27 Solar cell sealing sheet and method for producing the same, and solar cell module and method for manufacturing the same Pending JP2013232498A (en)

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Publication number Priority date Publication date Assignee Title
JPH06177412A (en) * 1992-12-10 1994-06-24 Bridgestone Corp Sealing material film for solar battery
JP2006036876A (en) * 2004-07-26 2006-02-09 Du Pont Mitsui Polychem Co Ltd Sealing material for solar battery and solar battery module using the same
JP2008103471A (en) * 2006-10-18 2008-05-01 Bridgestone Corp Solar battery, and sealing film for solar battery as well as selecting method of solar battery
WO2010131716A1 (en) * 2009-05-13 2010-11-18 三井・デュポンポリケミカル株式会社 Sheet for sealing solar cell, and solar cell module
JP2011040735A (en) * 2009-07-17 2011-02-24 Mitsubishi Plastics Inc Solar cell sealing material and solar cell module produced using the same
WO2011040282A1 (en) * 2009-09-29 2011-04-07 凸版印刷株式会社 Sealing material sheet for solar battery module, and process for production of solar battery module
JP2013159673A (en) * 2012-02-03 2013-08-19 Mitsui Chemicals Inc Solar cell encapsulant and solar cell module

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06177412A (en) * 1992-12-10 1994-06-24 Bridgestone Corp Sealing material film for solar battery
JP2006036876A (en) * 2004-07-26 2006-02-09 Du Pont Mitsui Polychem Co Ltd Sealing material for solar battery and solar battery module using the same
JP2008103471A (en) * 2006-10-18 2008-05-01 Bridgestone Corp Solar battery, and sealing film for solar battery as well as selecting method of solar battery
WO2010131716A1 (en) * 2009-05-13 2010-11-18 三井・デュポンポリケミカル株式会社 Sheet for sealing solar cell, and solar cell module
JP2011040735A (en) * 2009-07-17 2011-02-24 Mitsubishi Plastics Inc Solar cell sealing material and solar cell module produced using the same
WO2011040282A1 (en) * 2009-09-29 2011-04-07 凸版印刷株式会社 Sealing material sheet for solar battery module, and process for production of solar battery module
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