JP5788721B2 - Solar cell sealing film and solar cell using the same - Google Patents
Solar cell sealing film and solar cell using the same Download PDFInfo
- Publication number
- JP5788721B2 JP5788721B2 JP2011131839A JP2011131839A JP5788721B2 JP 5788721 B2 JP5788721 B2 JP 5788721B2 JP 2011131839 A JP2011131839 A JP 2011131839A JP 2011131839 A JP2011131839 A JP 2011131839A JP 5788721 B2 JP5788721 B2 JP 5788721B2
- Authority
- JP
- Japan
- Prior art keywords
- sealing film
- solar cell
- surface side
- side sealing
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 239000004408 titanium dioxide Substances 0.000 claims description 7
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Landscapes
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Description
本発明は、エチレン−酢酸ビニル共重合体を主成分とする太陽電池用封止膜、及びこれを用いた太陽電池に関する。 The present invention relates to a solar cell sealing film mainly composed of an ethylene-vinyl acetate copolymer, and a solar cell using the same.
近年、資源の有効利用や環境汚染の防止等の面から、太陽光を電気エネルギーに直接、変換する太陽電池が広く使用され、更に生産性や耐久性の点から開発が進められている。 In recent years, solar cells that directly convert sunlight into electrical energy have been widely used from the standpoints of effective use of resources and prevention of environmental pollution, and development has been promoted from the viewpoint of productivity and durability.
太陽電池は、例えば、図１に示すように、ガラス基板などからなる表面側透明保護部材１１、表面側封止膜１３Ａ、シリコン発電素子などの太陽電池用セル１４、裏面側封止膜１３Ｂ、及び裏面側保護部材１２をこの順で積層し、減圧で脱気した後、加熱加圧して表面側封止膜１３Ａ及び裏面側封止膜１３Ｂ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。従来の太陽電池では、高い電気出力を得るために、接続タブ１５により電気的に接続された複数の太陽電池用セル１４を接続して用いられている。従って、太陽電池用セル１４間の絶縁性を確保するために、絶縁性のある封止膜１３Ａ、１３Ｂを用いて太陽電池用セルを封止している。
For example, as shown in FIG. 1, the solar cell includes a surface side transparent
また、積層時の太陽電池用セルを配置する段階では、図２の説明図に示すように、太陽電池用セル１４同士をセル止めテープ１６で仮止めすることが行われている（特許文献１）。これにより、太陽電池用セル１４を所望とする正確な位置に配置し、配置後の太陽電池用セル１４の位置ズレを防止することができる。セル止めテープ１６としては安価であり透明性に優れることから一般にＰＥＴフィルムに粘着剤層を施したものが用いられている。
In addition, at the stage of arranging the solar battery cells at the time of lamination, as shown in the explanatory view of FIG. 2, the
また、封止膜１３Ａ、１３Ｂには、安価であり高い透明性及び接着性を有することからエチレン−酢酸ビニル共重合体（ＥＶＡ）フィルムなどが従来から用いられている。封止膜用のＥＶＡフィルムには、太陽電池用セルの機械的な耐久性の確保や、湿気又は水の透過による内部の導線や電極の発錆の防止のため、高度な密着性及び接着強度で各部材を接着一体化させる機能が必要である。 For the sealing films 13A and 13B, an ethylene-vinyl acetate copolymer (EVA) film or the like has been conventionally used because it is inexpensive and has high transparency and adhesiveness. EVA film for sealing film has high adhesion and adhesion strength to ensure mechanical durability of solar cell and prevent rusting of internal conductors and electrodes due to moisture or water permeation. Therefore, the function of bonding and integrating the members is necessary.
ＥＶＡフィルムは、エチレン−酢酸ビニル共重合体および架橋剤などを含む組成物を成膜することで作製される。有機過酸化物等の架橋剤を用いてＥＶＡを架橋させることにより、ＥＶＡフィルムの接着性、耐久性を向上させることができる。 The EVA film is produced by depositing a composition containing an ethylene-vinyl acetate copolymer and a crosslinking agent. By cross-linking EVA using a cross-linking agent such as an organic peroxide, the adhesiveness and durability of the EVA film can be improved.
また、太陽電池においては、太陽電池に入射した光をできるだけ効率よく太陽電池用セル内に取り込めるようにすることが発電効率の向上の点から望まれている。従って、表面側の太陽電池用封止膜は、できるだけ高い透明性を有し、入射した太陽光を吸収したり、反射したりすることが無く、太陽光のほとんどを透過させるものが望ましい。 Moreover, in a solar cell, it is desired from the point of the improvement of electric power generation efficiency that the light which injected into the solar cell can be taken in in the cell for solar cells as efficiently as possible. Therefore, the solar cell sealing film on the surface side is preferably as transparent as possible, and does not absorb or reflect incident sunlight and transmits most of sunlight.
しかしながら、太陽電池を長期間使用した場合、太陽光、特に紫外線の影響により、封止膜が黄変して、太陽光の透過率が低下する現象がみられること、及びその黄変による外観不良が問題となっている。この問題のため、従来から封止膜には紫外線吸収剤が添加されている。 However, when a solar cell is used for a long period of time, a phenomenon in which the sealing film turns yellow due to the influence of sunlight, particularly ultraviolet rays, and the transmittance of sunlight decreases, and the appearance defect due to the yellowing is observed. Is a problem. Due to this problem, an ultraviolet absorber has been conventionally added to the sealing film.
しかしながら、架橋剤と紫外線吸収剤の組合せ及び添加量によっては、封止膜に黄変が生じることが知られている（特許文献２）。この問題を解消するため、特許文献２では、紫外線吸収剤の含有量を少なくすることにより（封止膜の重量を基準として０．０１重量％以下）黄変の防止が図られている。 However, it is known that yellowing occurs in the sealing film depending on the combination and addition amount of the crosslinking agent and the ultraviolet absorber (Patent Document 2). In order to solve this problem, Patent Document 2 attempts to prevent yellowing by reducing the content of the ultraviolet absorber (0.01% by weight or less based on the weight of the sealing film).
特許文献２の技術では、黄変の原因となる紫外線吸収剤の添加量を減量しているので表面側封止膜の黄変は抑制される。しかしながら、紫外線吸収剤の含有量が減少すると表面側封止膜における紫外線の吸収能力が低下して、セル止めテープが紫外線の影響により黄変して外観特性が低下する問題がある。また、架橋剤も封止膜の黄変を引き起こすことが知られており、その配合量によっては隣接する他の部材との界面での発泡や太陽電池の製造段階における架橋速度に影響を与えることとなる。 In the technique of Patent Document 2, since the amount of the ultraviolet absorber that causes yellowing is reduced, yellowing of the surface side sealing film is suppressed. However, when the content of the ultraviolet absorber is reduced, the ultraviolet absorbing ability of the surface side sealing film is lowered, and there is a problem that the cell stopper tape is yellowed by the influence of ultraviolet rays and the appearance characteristics are lowered. In addition, crosslinking agents are also known to cause yellowing of the sealing film, and depending on the amount, the foaming at the interface with other adjacent members and the crosslinking rate in the solar cell manufacturing stage may be affected. It becomes.
したがって、本発明の目的は、太陽電池用セルが所定の位置にセル止めテープで仮止めされた太陽電池に使用する表面側封止膜であって、表面側封止膜及びセル止めテープの黄変が防止され、架橋速度が良好であり、発泡が抑制された太陽電池用表面側封止膜を提供することにある。 Therefore, an object of the present invention is a surface-side sealing film used for a solar battery in which a solar cell is temporarily fixed with a cell-stopping tape at a predetermined position, and the surface-side sealing film and the yellow of the cell-stopping tape are used. An object of the present invention is to provide a solar cell surface side sealing film in which alteration is prevented, crosslinking speed is good, and foaming is suppressed.
また、本発明の目的は、上記表面側封止膜を使用することにより発電効率が向上し、外観不良が防止された太陽電池を提供することにある。 Another object of the present invention is to provide a solar cell in which power generation efficiency is improved and appearance defects are prevented by using the surface side sealing film.
本発明者らは、架橋剤と紫外線吸収剤の組み合わせ及び添加量を検討し実験を重ねた結果、上記目的は、表面側透明保護部材、表面側封止膜、太陽電池用セル、裏面側封止膜及び裏面側保護部材がこの順で積層され、且つ前記太陽電池用セルが所定の位置にセル止めテープで仮止めされた積層体を、架橋一体化させることにより前記太陽電池用セルを封止してなる太陽電池に使用する前記表面側封止膜であって、
エチレン−酢酸ビニル共重合体、架橋剤及び紫外線吸収剤を含み、前記架橋剤が２，５−ジメチル−２，５−ジ（ｔ−ブチルパーオキシ）ヘキサンであり、前記エチレン−酢酸ビニル共重合体１００質量部に対して１．３〜２．０質量部含み、前記紫外線吸収剤が２−ヒドロキシ−４−ｎ−オクトキシベンゾフェノンであり、前記エチレン−酢酸ビニル共重合体１００質量部に対して０．０１５〜０．０５質量部含み、前記セル止めテープが、ポリエステル樹脂フィルムの表面に粘着剤層を有するテープであることを特徴とする太陽電池用表面側封止膜により達成されることを見出した。
As a result of investigating the combination and addition amount of the crosslinking agent and the ultraviolet absorber and repeating the experiment, the present inventors have found that the above objects are a surface-side transparent protective member, a surface-side sealing film, a solar cell, a back-side sealing. The solar battery cell is sealed by cross-linking and integrating the laminated body in which the stopper film and the back surface side protective member are laminated in this order, and the solar battery cell is temporarily fixed at a predetermined position with a cell stopper tape. The surface side sealing film used for a solar cell formed by stopping,
An ethylene-vinyl acetate copolymer, a crosslinking agent and a UV absorber, wherein the crosslinking agent is 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, and the ethylene-vinyl acetate copolymer 1.3-2.0 parts by mass with respect to 100 parts by mass of the coalescence, the ultraviolet absorber is 2-hydroxy-4-n-octoxybenzophenone, and with respect to 100 parts by mass of the ethylene-vinyl acetate copolymer 0.015 to 0.05 parts by mass, and the cell stopper tape is a tape having a pressure-sensitive adhesive layer on the surface of a polyester resin film, and is achieved by a surface-side sealing film for solar cells. I found.
また、上記目的は、表面側透明保護部材、表面側封止膜、太陽電池用セル、裏面側封止膜及び裏面側保護部材がこの順で積層され、且つ前記太陽電池用セルが所定の位置にセル止めテープで仮止めされた積層体を、架橋一体化させることにより前記太陽電池用セルを封止してなる太陽電池であって、前記表面側封止膜として、請求項１に記載の太陽電池用表面側封止膜を用い、前記セル止めテープが、ポリエステル樹脂フィルムの表面に粘着剤層を有するテープであることを特徴とする太陽電池によっても達成される。
Further, the object is to laminate the surface side transparent protective member, the surface side sealing film, the solar cell, the back side sealing film, and the back side protective member in this order, and the solar cell is in a predetermined position. It is a solar cell formed by sealing the solar cell by cross-linking and integrating the laminate temporarily fixed with the cell fixing tape, and the surface-side sealing film according to claim 1. It is also achieved by a solar cell using a solar cell surface side sealing film, wherein the cell stopper tape is a tape having an adhesive layer on the surface of a polyester resin film .
本発明に係る太陽電池の好ましい態様は以下の通りである。 Preferred embodiments of the solar cell according to the present invention are as follows.
（１）光源としてメタルハライドランプを使用して、紫外線を照射強度１０００Ｗ／ｍ２で２４時間照射した場合の、ＪＩＳ−Ｋ−７１０５（１９８１）に準拠して測定したセル止めテープの黄変度（ΔＹＩ）が４以下である。
この黄変度が４を超えるとセル止めテープの黄色味が視認可能となるので、４以下においては太陽電池の外観性の低下を防止することができる。
（２）裏面側封止膜が、エチレン−酢酸ビニル共重合体、架橋剤及び着色剤を含む。
表面側透明保護部材及び表面側封止膜を透過し、更に太陽電池用セル同士の隙間等から裏面側封止膜に達した紫外線領域の波長を含む太陽光を反射させ、太陽電池用セルに入射させることで発電効率の向上を図ることができる。また、紫外線領域の波長を反射させることで裏面側保護部材へ透過することが防止され、紫外線による裏面側保護部材の黄変を防止することができる。
（３）着色剤が、二酸化チタンである。
太陽光、特に紫外線を良好に反射させることが可能である。
（４）裏面側封止膜が、エチレン−酢酸ビニル共重合体、架橋剤及び紫外線吸収剤を含み、紫外線吸収剤が、前記エチレン−酢酸ビニル共重合体１００質量部に対して、０．２〜０．５質量部含む。
紫外線を裏面側封止膜で吸収することで紫外線の裏面側保護部材への入射が抑制され、その黄変を防止することができる。
(1) Yellowness of cell stopper tape measured according to JIS-K-7105 (1981) when a metal halide lamp is used as a light source and irradiated with ultraviolet rays at an irradiation intensity of 1000 W / m 2 for 24 hours ( ΔYI) is 4 or less.
If this yellowing degree exceeds 4, the yellowness of the cell-stopping tape can be visually recognized. Therefore, when the degree of yellowing is 4 or less, it is possible to prevent the appearance of the solar cell from being deteriorated.
( 2 ) The back side sealing film contains an ethylene-vinyl acetate copolymer, a crosslinking agent and a colorant.
Reflects sunlight including the wavelength in the ultraviolet region that has passed through the surface-side transparent protective member and the surface-side sealing film, and has reached the back-side sealing film from the gaps between the cells for solar cells. Increasing the power generation efficiency can be achieved by making the light incident. Further, by reflecting the wavelength in the ultraviolet region, it is possible to prevent transmission to the back side protection member, and yellowing of the back side protection member due to ultraviolet rays can be prevented.
( 3 ) The colorant is titanium dioxide.
Sunlight, particularly ultraviolet rays can be reflected well.
( 4 ) The back side sealing film contains an ethylene-vinyl acetate copolymer, a crosslinking agent, and an ultraviolet absorber, and the ultraviolet absorber is 0.2 by mass with respect to 100 parts by mass of the ethylene-vinyl acetate copolymer. Contains 0.5 parts by mass.
By absorbing the ultraviolet light with the back surface side sealing film, the incidence of the ultraviolet light on the back surface side protection member is suppressed, and the yellowing can be prevented.
本発明に係る表面側封止膜によれば、架橋剤と紫外線吸収剤の上記組合せ及び添加量とすることにより、表面側封止膜及びセル止めテープの黄変を有効に防止することができ、架橋速度が良好となり、発泡を防止することができる。すなわち、紫外線吸収剤を適量で使用することで表面側封止膜及びセル止めテープの黄変が防止される一方で、表面側封止膜の黄変が生じない範囲で架橋剤の含有量を多くすることができるので、架橋速度の低下及び発泡が防止される。また、裏面側封止膜として、上記規定した封止膜を使用することにより、裏面側保護部材の黄変が防止され、更には太陽電池の発電効率を向上させることも可能となる。 According to the surface side sealing film according to the present invention, yellowing of the surface side sealing film and the cell stopper tape can be effectively prevented by using the above combination and addition amount of the crosslinking agent and the ultraviolet absorber. The crosslinking rate becomes good and foaming can be prevented. That is, by using an appropriate amount of the ultraviolet absorber, yellowing of the surface side sealing film and the cell stopper tape is prevented, while the content of the crosslinking agent is within a range where yellowing of the surface side sealing film does not occur. Since it can be increased, a reduction in the crosslinking rate and foaming are prevented. Moreover, by using the sealing film specified above as the back surface side sealing film, yellowing of the back surface side protection member can be prevented, and further, the power generation efficiency of the solar cell can be improved.
上述したように、本発明に係る表面側封止膜は、エチレン−酢酸ビニル共重合体１００質量部に対して、１．３〜２．０質量部の２，５−ジメチル−２，５−ジ（ｔ−ブチルパーオキシ）ヘキサン（以下、架橋剤Ａとも称する。）及び０．０１５〜０．０５質量部の２−ヒドロキシ−４−ｎ−オクトキシベンゾフェノン（以下、紫外線吸収剤Ａとも称する。）を含んでいる。また、本発明に係る太陽電池に使用する裏面側封止膜は、エチレン−酢酸ビニル共重合体を主成分とし、架橋剤並びに着色剤及び／又は紫外線吸収剤を含んでいる。
As described above, the surface-side sealing film according to the present invention is 1.3 to 2.0 parts by mass of 2,5-dimethyl- 2,5-5-100 parts by mass of ethylene-vinyl acetate copolymer. Di (t-butylperoxy) hexane (hereinafter also referred to as crosslinking agent A) and 0.015-0.05 parts by mass of 2-hydroxy-4-n-octoxybenzophenone (hereinafter also referred to as ultraviolet absorber A). .) Moreover, the back surface side sealing film used for the solar cell which concerns on this invention has ethylene-vinyl acetate copolymer as a main component, and contains the crosslinking agent and the coloring agent and / or the ultraviolet absorber.
以下、本発明の太陽電池用封止膜及び太陽電池をより詳細に説明する。 Hereinafter, the solar cell sealing film and the solar cell of the present invention will be described in more detail.
［エチレン−酢酸ビニル共重合体］
表面側封止膜及び裏面側封止膜は、エチレン−酢酸ビニル共重合体（ＥＶＡとも言う）を主成分とすることで、安価であり、加工性及び柔軟性に優れる太陽電池用封止膜を形成することができる。
[Ethylene-vinyl acetate copolymer]
The front-side sealing film and the back-side sealing film have an ethylene-vinyl acetate copolymer (also referred to as EVA) as a main component, are inexpensive, and have excellent workability and flexibility. Can be formed.
エチレン−酢酸ビニル共重合体における酢酸ビニルの含有量は、前記エチレン−酢酸ビニル共重合体の質量を基準として２０〜３５質量％、さらに２２〜３０質量％、特に２４〜２８質量％とするのが好ましい。酢酸ビニルの含有量が２０質量％未満であると、封止膜用組成物の流動性が低くなり、封止膜の加工性が低下する恐れがあり、３５質量％を超えると、カルボン酸、アルコール、アミン等が発生し封止膜と保護部材との界面で発泡が生じ易くなる恐れがある。 The content of vinyl acetate in the ethylene-vinyl acetate copolymer is 20 to 35% by mass, more preferably 22 to 30% by mass, especially 24 to 28% by mass based on the mass of the ethylene-vinyl acetate copolymer. Is preferred. If the vinyl acetate content is less than 20% by mass, the fluidity of the composition for sealing film may be lowered, and the processability of the sealing film may be reduced. If the content exceeds 35% by mass, carboxylic acid, Alcohol, amine, or the like may be generated, and foaming may easily occur at the interface between the sealing film and the protective member.
表面側封止膜及び裏面側封止膜は、エチレン−酢酸ビニル共重合体に加えて、さらにポリビニルアセタール系樹脂（例えば、ポリビニルホルマール、ポリビニルブチラール（ＰＶＢ樹脂）、変性ＰＶＢ）、塩化ビニル樹脂を副次的に使用しても良い。その場合、特にＰＶＢが好ましい。 In addition to the ethylene-vinyl acetate copolymer, the front side sealing film and the back side sealing film are made of polyvinyl acetal resin (for example, polyvinyl formal, polyvinyl butyral (PVB resin), modified PVB), and vinyl chloride resin. It may be used as a secondary. In that case, PVB is particularly preferable.
［２，５−ジメチル−２，５−ジ（ｔ−ブチルパーオキシ）ヘキサン（架橋剤Ａ）：表面側封止膜用］
２，５−ジメチル−２，５−ジ（ｔ−ブチルパーオキシ）ヘキサンは、ジアルキルパーオキサイド類有機過酸化物に分類される有機過酸化物であり、その構造は、下記式（Ｉ）
[2,5-dimethyl-2,5-di (t-butylperoxy) hexane (crosslinking agent A): for surface side sealing film]
2,5-dimethyl-2,5-di (t-butylperoxy) hexane is an organic peroxide classified as a dialkyl peroxide organic peroxide, and the structure thereof is represented by the following formula (I).
架橋剤Ａは、エチレン−酢酸ビニル共重合体１００質量部に対して、１．３〜２．０質量部の量で用いる。１．２質量部より少ないと架橋速度が低下する場合があり、２．５質量部より多いと表面側封止膜の黄変や架橋段階での発泡が生じる場合がある。
The cross-linking agent A is 1 . Used in an amount of 3 to 2.0 parts by mass. If the amount is less than 1.2 parts by mass, the crosslinking rate may be reduced. If the amount is more than 2.5 parts by mass, the surface side sealing film may be yellowed or foamed in the crosslinking stage.
［２−ヒドロキシ−４−ｎ−オクトキシベンゾフェノン（紫外線吸収剤Ａ）：表面側封止膜用］
２−ヒドロキシ−４−ｎ−オクトキシベンゾフェノンは、ベンゾフェノン系紫外線吸収剤に分類され、その構造は、下記式（ＩＩ）
[2-Hydroxy-4-n-octoxybenzophenone (ultraviolet absorber A): for surface side sealing film]
2-Hydroxy-4-n-octoxybenzophenone is classified as a benzophenone ultraviolet absorber, and the structure thereof is represented by the following formula (II).
紫外線吸収剤Ａは、エチレン−酢酸ビニル共重合体１００質量部に対して、０．０１５〜０．０５質量部、好ましくは０．０２〜０．０５質量部の量で用いる。０．０１５質量部より少ないとセル止めテープが黄変する場合があり、０．０５質量部より多いと表面側封止膜の黄変が生じる場合がある。 The ultraviolet absorber A is used in an amount of 0.015 to 0.05 parts by mass, preferably 0.02 to 0.05 parts by mass with respect to 100 parts by mass of the ethylene-vinyl acetate copolymer. When the amount is less than 0.015 parts by mass, the cell stopper tape may be yellowed. When the amount is more than 0.05 parts by mass, the surface side sealing film may be yellowed.
［着色剤：裏面側封止膜用］
裏面側封止膜に着色剤を含有させることにより、表面側封止膜を透過した太陽光、特に紫外線領域の波長を反射させて太陽電池用セルに入射させることで発電効率の向上が図られる。また、裏面側保護部材への紫外線の入射が阻止され、その黄変を防止することができる。
[Colorant: For back side sealing film]
Inclusion of a colorant in the back side sealing film improves the power generation efficiency by reflecting the sunlight transmitted through the front side sealing film, particularly the wavelength in the ultraviolet region, and entering the solar cell. . Moreover, the incidence of ultraviolet rays on the back surface side protection member is blocked, and the yellowing can be prevented.
着色剤としては、二酸化チタン（チタン白）、炭酸カルシウム等による白色顔料；ウルトラマリン等による青色顔料；カーボンブラック等による黒色顔料；ガラスビーズ及び光拡散剤等による乳白色顔料などを使用することができる。この中でも、白色顔料が好ましく、特に二酸化チタンが好ましい。 Examples of the colorant that can be used include white pigments such as titanium dioxide (titanium white) and calcium carbonate; blue pigments such as ultramarine; black pigments such as carbon black; milky white pigments such as glass beads and light diffusing agents. . Among these, a white pigment is preferable, and titanium dioxide is particularly preferable.
また、これら顔料の平均粒径は２００〜２５０ｎｍ、好ましくは２００〜２３０ｎｍであることが好ましい。この範囲の微粒子を使用することにより紫外線領域の波長（特に３００〜４００ｎｍ）の反射率を向上させることができる。本発明において平均粒径は、封止膜を電子顕微鏡（好ましくは透過型電子顕微鏡）により倍率１００万倍程度で観測し、少なくとも１００個の着色剤微粒子の投影面積円相当径を求めた数平均値とする。 The average particle size of these pigments is 200 to 250 nm, preferably 200 to 230 nm. By using the fine particles in this range, it is possible to improve the reflectance of the wavelength in the ultraviolet region (particularly 300 to 400 nm). In the present invention, the average particle diameter is a number average obtained by observing the sealing film with an electron microscope (preferably a transmission electron microscope) at a magnification of about 1,000,000 times, and determining the projected area circle equivalent diameter of at least 100 colorant fine particles. Value.
着色剤の含有量は、裏面側封止膜に使用するエチレン−酢酸ビニル共重合体１００重量部に対して、一般に２〜１０重量部、好ましくは３〜６質量部であることが好ましい。この範囲の添加量であれば、反射性及び加工性が良好となる。 The content of the colorant is generally 2 to 10 parts by weight, preferably 3 to 6 parts by weight with respect to 100 parts by weight of the ethylene-vinyl acetate copolymer used for the back side sealing film. If the addition amount is within this range, the reflectivity and workability will be good.
［紫外線吸収剤：裏面側封止膜用］
裏面側封止膜に使用する紫外線吸収剤としては、特に制限されないが、２−ヒドロキシ−４−メトキシベンゾフェノン、２−ヒドロキシ−４−ｎ−ドデシロキシベンゾフェノン、２，４−ジヒドロ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−ｎ−オクトキシベンゾフェノン等のベンゾフェノン系紫外線吸収剤が好ましく挙げられる。特に、２−ヒドロキシ−４−ｎ−オクトキシベンゾフェノンが好ましい。紫外線吸収剤の配合量は、エチレン−酢酸ビニル共重合体１００質量部に対して０．２〜０．５質量部、好ましくは０．２〜０．４質量部であることが好ましい。０．２質量部より少ないと紫外線吸収性が低下して裏面側保護部材（バックシート）に透過する紫外線量が増大して黄変が生じる場合がある。０．５質量部より多いと裏面側封止膜の黄変が生じる場合がある。これら紫外線吸収剤は１種単独でも、２種以上を混合しても使用することができる。なお、裏面側封止膜は、着色剤と紫外線吸収剤の両方を含んでいてもよい。
[Ultraviolet absorber: For back side sealing film]
Although it does not restrict | limit especially as an ultraviolet absorber used for a back surface side sealing film, 2-hydroxy-4-methoxy benzophenone, 2-hydroxy-4-n-dodecyloxy benzophenone, 2, 4- dihydroxy benzophenone, 2, Preferred examples include benzophenone ultraviolet absorbers such as 2′-dihydroxy-4-methoxybenzophenone and 2-hydroxy-4-n-octoxybenzophenone. In particular, 2-hydroxy-4-n-octoxybenzophenone is preferable. The compounding amount of the ultraviolet absorber is 0.2 to 0.5 parts by mass, preferably 0.2 to 0.4 parts by mass with respect to 100 parts by mass of the ethylene-vinyl acetate copolymer. If the amount is less than 0.2 parts by mass, the ultraviolet absorptivity may be reduced, and the amount of ultraviolet rays transmitted to the back surface side protective member (back sheet) may be increased to cause yellowing. If the amount is more than 0.5 parts by mass, yellowing of the back side sealing film may occur. These ultraviolet absorbers can be used alone or in combination of two or more. The back side sealing film may contain both a colorant and an ultraviolet absorber.
裏面側封止膜に紫外線吸収剤を上記量で配合することにより、表面側封止膜に配合する紫外線吸収剤を少なくしたことによる紫外線透過性の上昇により引き起こされ得る裏面側保護部材（バックシート）が黄変することを防止することができる。 Back surface protective member (back sheet) that can be caused by an increase in ultraviolet light transmittance due to a decrease in the amount of ultraviolet absorber blended in the front surface side sealing film by blending the back surface side sealing film with the above amount of the ultraviolet absorber. ) Can be prevented from yellowing.
［架橋剤：裏面側封止膜用］
裏面側封止膜に使用する架橋剤は、エチレン−酢酸ビニル共重合体の架橋構造を形成することができるものである。架橋剤は、有機過酸化物又は光重合開始剤を用いることが好ましい。なかでも、接着力、耐湿性、耐貫通性の温度依存性が改善された封止膜が得られることから、有機過酸化物を用いるのが好ましい。
[Crosslinking agent: For back side sealing film]
The crosslinking agent used for the back surface side sealing film is capable of forming a crosslinked structure of an ethylene-vinyl acetate copolymer. As the crosslinking agent, an organic peroxide or a photopolymerization initiator is preferably used. Among these, it is preferable to use an organic peroxide because a sealing film with improved temperature dependency of adhesive strength, moisture resistance, and penetration resistance can be obtained.
有機過酸化物としては、１００℃以上の温度で分解してラジカルを発生するものであれば、どのようなものでも使用することができる。有機過酸化物は、一般に、成膜温度、組成物の調整条件、硬化温度、被着体の耐熱性、貯蔵安定性を考慮して選択される。特に、半減期１０時間の分解温度が７０℃以上のものが好ましい。 Any organic peroxide can be used as long as it decomposes at a temperature of 100 ° C. or higher to generate radicals. The organic peroxide is generally selected in consideration of the film formation temperature, the adjustment conditions of the composition, the curing temperature, the heat resistance of the adherend, and the storage stability. In particular, those having a decomposition temperature of 70 hours or more with a half-life of 10 hours are preferred.
前記有機過酸化物としては、樹脂の加工温度・貯蔵安定性の観点から例えば、ベンゾイルパーオキサイド系硬化剤、ｔｅｒｔ−ヘキシルパーオキシピバレート、ｔｅｒｔ−ブチルパーオキシピバレート、３，５，５−トリメチルヘキサノイルパーオキサイド、ジ−ｎ−オクタノイルパーオキサイド、ラウロイルパーオキサイド、ステア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、スクシニックアシドパーオキサイド、２，５−ジメチル−２，５−ジ（ｔｅｒｔ−ブチルパーオキシ）ヘキサン、２，５−ジメチル−２，５−ジ（２−エチルヘキサノイルパーオキシ）ヘキサン、１−シクロヘキシル−１−メチルエチルパーオキシ−２−エチルヘキサノエート、ｔｅｒｔ−ヘキシルパーオキシ−２−エチルヘキサノエート、４−メチルベンゾイルパーオキサイド、ｔｅｒｔ−ブチルパーオキシ−２−エチルヘキサノエート、ｍ−トルオイル＋ベンゾイルパーオキサイド、ベンゾイルパーオキサイド、１，１−ビス（ｔｅｒｔ−ブチルパーオキシ）−２−メチルシクロヘキサネート、１，１−ビス（ｔｅｒｔ−ヘキシルパーオキシ）−３，３，５−トリメチルシクロヘキサネート、１，１−ビス（ｔｅｒｔ−ヘキシルパーオキシ）シクロヘキサネート、１，１−ビス（ｔｅｒｔ−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−ビス（ｔｅｒｔ−ブチルパーオキシ）シクロヘキサン、２，２−ビス（４，４−ジ−ｔｅｒｔ−ブチルパーオキシシクロヘキシル）プロパン、１，１−ビス（ｔｅｒｔ−ブチルパーオキシ）シクロドデカン、ｔｅｒｔ−ヘキシルパーオキシイソプロピルモノカーボネート、ｔｅｒｔ−ブチルパーオキシマレイックアシド、ｔｅｒｔ−ブチルパーオキシ−３，３，５−トリメチルヘキサン、ｔｅｒｔ−ブチルパーオキシラウレート、２，５−ジメチル−２，５−ジ（メチルベンゾイルパーオキシ）ヘキサン、ｔｅｒｔ−ブチルパーオキシイソプロピルモノカーボネート、ｔｅｒｔ−ブチルパーオキシ−２−エチルヘキシルモノカーボネート、ｔｅｒｔ−ヘキシルパーオキシベンゾエート、２，５−ジ−メチル−２，５−ジ（ベンゾイルパーオキシ）ヘキサン、等が挙げられる。 Examples of the organic peroxide include, from the viewpoint of resin processing temperature and storage stability, for example, benzoyl peroxide curing agent, tert-hexyl peroxypivalate, tert-butyl peroxypivalate, 3, 5, 5- Trimethylhexanoyl peroxide, di-n-octanoyl peroxide, lauroyl peroxide, stearoyl peroxide, 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate, succinic acid peroxide, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexane, 2,5-dimethyl-2,5-di (2-ethylhexanoylperoxy) hexane, 1-cyclohexyl-1-methylethyl Peroxy-2-ethylhexanoate, tert-hexyl par Xyl-2-ethylhexanoate, 4-methylbenzoyl peroxide, tert-butylperoxy-2-ethylhexanoate, m-toluoyl + benzoyl peroxide, benzoyl peroxide, 1,1-bis (tert-butyl Peroxy) -2-methylcyclohexanate, 1,1-bis (tert-hexylperoxy) -3,3,5-trimethylcyclohexanate, 1,1-bis (tert-hexylperoxy) cyclohexanate 1,1-bis (tert-butylperoxy) -3,3,5-trimethylcyclohexane, 1,1-bis (tert-butylperoxy) cyclohexane, 2,2-bis (4,4-di-tert) -Butylperoxycyclohexyl) propane, 1,1-bis (tert-butyl) -Oxy) cyclododecane, tert-hexylperoxyisopropyl monocarbonate, tert-butylperoxymaleic acid, tert-butylperoxy-3,3,5-trimethylhexane, tert-butylperoxylaurate, 2,5- Dimethyl-2,5-di (methylbenzoylperoxy) hexane, tert-butylperoxyisopropyl monocarbonate, tert-butylperoxy-2-ethylhexyl monocarbonate, tert-hexylperoxybenzoate, 2,5-di-methyl -2,5-di (benzoylperoxy) hexane, and the like.
ベンゾイルパーオキサイド系硬化剤としては、７０℃以上の温度で分解してラジカルを発生するものであればいずれも使用可能であるが、半減期１０時間の分解温度が５０℃以上のものが好ましく、調製条件、成膜温度、硬化（貼り合わせ）温度、被着体の耐熱性、貯蔵安定性を考慮して適宜選択できる。使用可能なベンゾイルパーオキサイド系硬化剤としては、例えば、ベンゾイルパーオキサイド、２，５−ジメチルヘキシル−２，５−ビスパーオキシベンゾエート、ｐ−クロロベンゾイルパーオキサイド、ｍ−トルオイルパーオキサイド、２，４−ジクロロベンゾイルパーオキサイド、ｔ−ブチルパーオキシベンゾエート等が挙げられる。ベンゾイルパーオキサイド系硬化剤は１種でも２種以上を組み合わせて使用してもよい。 As the benzoyl peroxide-based curing agent, any can be used as long as it decomposes at a temperature of 70 ° C. or higher to generate radicals, and those having a decomposition temperature of 50 hours or higher with a half-life of 10 hours are preferable, It can be appropriately selected in consideration of preparation conditions, film formation temperature, curing (bonding) temperature, heat resistance of the adherend, and storage stability. Usable benzoyl peroxide curing agents include, for example, benzoyl peroxide, 2,5-dimethylhexyl-2,5-bisperoxybenzoate, p-chlorobenzoyl peroxide, m-toluoyl peroxide, 2, Examples include 4-dichlorobenzoyl peroxide and t-butyl peroxybenzoate. The benzoyl peroxide curing agent may be used alone or in combination of two or more.
有機過酸化物として、特に、２，５−ジメチル−２，５ジ（ｔｅｒｔ−ブチルパーオキシ）ヘキサン、１，１−ビス（ｔｅｒｔ−ヘキシルパーオキシ）−３，３，５−トリメチルシクロヘキサンが好ましい。これにより、発泡が抑制され、優れた絶縁性を有する太陽電池用封止膜が得られる。 As the organic peroxide, 2,5-dimethyl-2,5di (tert-butylperoxy) hexane and 1,1-bis (tert-hexylperoxy) -3,3,5-trimethylcyclohexane are particularly preferable. . Thereby, foaming is suppressed and the solar cell sealing film which has the outstanding insulation is obtained.
裏面側封止膜に使用する有機過酸化物の含有量は、エチレン−酢酸ビニル共重合体１００質量部に対して、好ましくは０．１〜５質量部、より好ましくは０．２〜３質量部であることが好ましい。有機過酸化物の含有量は、少ないと架橋硬化時において架橋速度が低下する場合があり、多くなると共重合体との相溶性が悪くなる恐れがある。 The content of the organic peroxide used for the back side sealing film is preferably 0.1 to 5 parts by mass, more preferably 0.2 to 3 parts by mass with respect to 100 parts by mass of the ethylene-vinyl acetate copolymer. Part. If the content of the organic peroxide is small, the crosslinking speed may be lowered during the crosslinking and curing, and if the content is large, the compatibility with the copolymer may be deteriorated.
また、光重合開始剤としては、公知のどのような光重合開始剤でも使用することができるが、配合後の貯蔵安定性の良いものが望ましい。このような光重合開始剤としては、例えば、２−ヒドロキシ−２−メチル−１−フェニルプロパン−１−オン、１−ヒドロキシシクロヘキシルフェニルケトン、２−メチル−１−（４−（メチルチオ）フェニル）−２−モルホリノプロパン−１などのアセトフェノン系、ベンジルジメチルケタ−ルなどのベンゾイン系、ベンゾフェノン、４−フェニルベンゾフェノン、ヒドロキシベンゾフェノンなどのベンゾフェノン系、イソプロピルチオキサントン、２−４−ジエチルチオキサントンなどのチオキサントン系、その他特殊なものとしては、メチルフェニルグリオキシレ−トなどが使用できる。特に好ましくは、２−ヒドロキシ−２−メチル−１−フェニルプロパン−１−オン、１−ヒドロキシシクロヘキシルフェニルケトン、２−メチル−１−（４−（メチルチオ）フェニル）−２−モルホリノプロパン−１、ベンゾフェノン等が挙げられる。これら光重合開始剤は、必要に応じて、４−ジメチルアミノ安息香酸のごとき安息香酸系又は、第３級アミン系などの公知慣用の光重合促進剤の１種または２種以上を任意の割合で混合して使用することができる。また、光重合開始剤のみの１種単独または２種以上の混合で使用することができる。 As the photopolymerization initiator, any known photopolymerization initiator can be used, but a photopolymerization initiator having good storage stability after blending is desirable. Examples of such a photopolymerization initiator include 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, and 2-methyl-1- (4- (methylthio) phenyl). Acetophenones such as 2-morpholinopropane-1, benzoins such as benzyldimethylketal, benzophenones such as benzophenone, 4-phenylbenzophenone and hydroxybenzophenone, thioxanthones such as isopropylthioxanthone and 2-4-diethylthioxanthone, As other special ones, methylphenylglyoxylate can be used. Particularly preferably, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropane-1, Examples include benzophenone. These photopolymerization initiators may contain one or two or more kinds of known and commonly used photopolymerization accelerators such as benzoic acid-based or tertiary amine-based compounds such as 4-dimethylaminobenzoic acid as required. Can be mixed and used. Moreover, it can be used individually by 1 type of only a photoinitiator, or 2 or more types of mixture.
前記光重合開始剤の含有量は、エチレン−酢酸ビニル共重合体１００質量部に対して０．５〜５．０質量部であることが好ましい。 The content of the photopolymerization initiator is preferably 0.5 to 5.0 parts by mass with respect to 100 parts by mass of the ethylene-vinyl acetate copolymer.
［架橋助剤］
架橋硬化前の表面側封止膜及び裏面側封止膜は、架橋助剤を含んでいることが好ましい。架橋助剤は、エチレン−酢酸ビニル共重合体の架橋密度を向上させ、封止膜の接着性及び耐久性を向上させることができる。
[Crosslinking aid]
It is preferable that the front surface side sealing film and the back surface side sealing film before cross-linking curing contain a cross-linking aid. The crosslinking aid can improve the crosslinking density of the ethylene-vinyl acetate copolymer and improve the adhesion and durability of the sealing film.
架橋助剤は、エチレン−酢酸ビニル共重合体１００質量部に対して、好ましくは０．１〜３．０質量部、より好ましくは０．１〜２．５質量部で使用される。このような架橋助剤の含有量であれば、架橋助剤の添加によるガスの発生もなく、エチレン−酢酸ビニル共重合体の架橋密度を向上させることができる。 The crosslinking aid is preferably used in an amount of 0.1 to 3.0 parts by mass, more preferably 0.1 to 2.5 parts by mass with respect to 100 parts by mass of the ethylene-vinyl acetate copolymer. With such a content of the crosslinking aid, there is no generation of gas due to the addition of the crosslinking aid, and the crosslinking density of the ethylene-vinyl acetate copolymer can be improved.
架橋助剤（官能基としてラジカル重合性基を有する化合物）としては、トリアリルシアヌレート、トリアリルイソシアヌレート等の３官能の架橋助剤の他、（メタ）アクリルエステル（例、ＮＫエステル等）の単官能又は２官能の架橋助剤等を挙げることができる。なかでも、トリアリルシアヌレート及びトリアリルイソシアヌレートが好ましく、特にトリアリルイソシアヌレートが好ましい。 Examples of the crosslinking aid (compound having a radical polymerizable group as a functional group) include trifunctional crosslinking aids such as triallyl cyanurate and triallyl isocyanurate, and (meth) acrylic esters (eg, NK ester). And monofunctional or bifunctional crosslinking aids. Of these, triallyl cyanurate and triallyl isocyanurate are preferable, and triallyl isocyanurate is particularly preferable.
［接着性向上剤］
表面側封止膜及び裏面側封止膜は、接着力を高める目的で、シランカップリング剤を含むことが好ましい。シランカップリング剤としては、γ−メタクリロキシプロピルトリメトキシシラン、γ−メタクリロキシプロピルトリエトキシシラン、γ−クロロプロピルメトキシシラン、ビニルエトキシシラン、ビニルトリス（β−メトキシエトキシ）シラン、ビニルトリアセトキシシラン、γ−グリシドキシプロピルトリメトキシシラン、γ−グリシドキシプロピルトリエトキシシラン、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、ビニルトリクロロシラン、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エトキシシラン、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挙げることができる。この中でも、メタクリロキシ基を含むシランカップリング剤であるγ−メタクリロキシプロピルトリメトキシシラン、γ−メタクリロキシプロピルトリエトキシシランが好ましく、特に、γ−メタクリロキシプロピルトリメトキシシランが好ましい。これらシランカップリング剤は、単独で使用しても、又は２種以上組み合わせて使用しても良い。また、シランカップリング剤の含有量は、エチレン−酢酸ビニル共重合体１００質量部に対して０．０１〜５質量部であることが好ましく、特に０．１〜２質量部が好ましい。
[Adhesion improver]
It is preferable that the front side sealing film and the back side sealing film contain a silane coupling agent for the purpose of increasing the adhesive force. As the silane coupling agent, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, γ-chloropropylmethoxysilane, vinylethoxysilane, vinyltris (β-methoxyethoxy) silane, vinyltriacetoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, vinyltrichlorosilane, γ-mercaptopropyltrimethoxysilane, γ-amino Examples thereof include propyltriethoxysilane, N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane. Among these, γ-methacryloxypropyltrimethoxysilane and γ-methacryloxypropyltriethoxysilane which are silane coupling agents containing a methacryloxy group are preferable, and γ-methacryloxypropyltrimethoxysilane is particularly preferable. These silane coupling agents may be used alone or in combination of two or more. Moreover, it is preferable that it is 0.01-5 mass parts with respect to 100 mass parts of ethylene-vinyl acetate copolymers, and, as for content of a silane coupling agent, 0.1-2 mass parts is especially preferable.
［その他］
本発明に係る表面側封止膜及び裏面側封止膜は、膜の種々の物性（機械的強度、透明性等の光学的特性、耐熱性、耐光性、架橋速度等）の改良あるいは調整、特に機械的強度の改良のため、必要に応じて、可塑剤、アクリロキシ基含有化合物、メタクリロキシ基含有化合物及び／又はエポキシ基含有化合物などの各種添加剤をさらに含んでいてもよい。
[Others]
The front-side sealing film and the back-side sealing film according to the present invention are improved or adjusted for various physical properties of the film (optical properties such as mechanical strength and transparency, heat resistance, light resistance, crosslinking speed, etc.) In particular, various additives such as a plasticizer, an acryloxy group-containing compound, a methacryloxy group-containing compound, and / or an epoxy group-containing compound may be further included as necessary for improving mechanical strength.
前記可塑剤としては、特に限定されるものではないが、一般に多塩基酸のエステル、多価アルコールのエステルが使用される。その例としては、ジオクチルフタレート、ジヘキシルアジペート、トリエチレングリコール−ジ−２−エチルブチレート、ブチルセバケート、テトラエチレングリコールジプタノエート、トリエチレングリコールジペラルゴネートを挙げることができる。可塑剤は一種用いてもよく、二種以上組み合わせて使用してもよい。可塑剤の含有量はエチレン−酢酸ビニル共重合体１００質量部に対して５質量部以下の範囲が好ましい。 The plasticizer is not particularly limited, but polybasic acid esters and polyhydric alcohol esters are generally used. Examples thereof include dioctyl phthalate, dihexyl adipate, triethylene glycol-di-2-ethylbutyrate, butyl sebacate, tetraethylene glycol diptanoate, and triethylene glycol dipelargonate. One plasticizer may be used, or two or more plasticizers may be used in combination. The content of the plasticizer is preferably in the range of 5 parts by mass or less with respect to 100 parts by mass of the ethylene-vinyl acetate copolymer.
前記アクリロキシ基含有化合物及び前記メタクリロキシ基含有化合物としては、一般にアクリル酸あるいはメタクリル酸誘導体であり、例えばアクリル酸あるいはメタクリル酸のエステルやアミドを挙げることができる。エステル残基の例としては、メチル、エチル、ドデシル、ステアリル、ラウリル等の直鎖状のアルキル基、シクロヘキシル基、テトラヒドロフルフリル基、アミノエチル基、２−ヒドロキシエチル基、３−ヒドロキシプロピル基、３−クロロ−２−ヒドロキシプロピル基を挙げることができる。アミドの例としては、ジアセトンアクリルアミドを挙げることができる。また、エチレングリコール、トリエチレングリコール、ポリプロピレングリコール、ポリエチレングリコール、トリメチロールプロパン、ペンタエリスリトール等の多価アルコールとアクリル酸あるいはメタクリル酸のエステルも挙げることができる。 The acryloxy group-containing compound and the methacryloxy group-containing compound are generally acrylic acid or methacrylic acid derivatives, and examples thereof include acrylic acid or methacrylic acid esters and amides. Examples of ester residues include methyl, ethyl, dodecyl, stearyl, lauryl and other linear alkyl groups, cyclohexyl group, tetrahydrofurfuryl group, aminoethyl group, 2-hydroxyethyl group, 3-hydroxypropyl group, A 3-chloro-2-hydroxypropyl group can be mentioned. Examples of amides include diacetone acrylamide. In addition, polyhydric alcohols such as ethylene glycol, triethylene glycol, polypropylene glycol, polyethylene glycol, trimethylolpropane, and pentaerythritol, and esters of acrylic acid or methacrylic acid can also be used.
前記エポキシ含有化合物としては、トリグリシジルトリス（２−ヒドロキシエチル）イソシアヌレート、ネオペンチルグリコールジグリシジルエーテル、１，６−ヘキサンジオールジグリシジルエーテル、アリルグリシジルエーテル、２−エチルヘキシルグリシジルエーテル、フェニルグリシジルエーテル、フェノール（エチレンオキシ）５グリシジルエーテル、ｐ−ｔ−ブチルフェニルグリシジルエーテル、アジピン酸ジグリシジルエステル、フタル酸ジグリシジルエステル、グリシジルメタクリレート、ブチルグリシジルエーテルを挙げることができる。 Examples of the epoxy-containing compound include triglycidyl tris (2-hydroxyethyl) isocyanurate, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, allyl glycidyl ether, 2-ethylhexyl glycidyl ether, phenyl glycidyl ether, Phenol (ethyleneoxy) 5 glycidyl ether, pt-butylphenyl glycidyl ether, adipic acid diglycidyl ester, phthalic acid diglycidyl ester, glycidyl methacrylate, butyl glycidyl ether can be mentioned.
前記アクリロキシ基含有化合物、前記メタクリロキシ基含有化合物、または前記エポキシ基含有化合物は、それぞれエチレン−酢酸ビニル共重合体１００質量部に対してそれぞれ一般に０．５〜５．０質量部、特に１．０〜４．０質量部含まれていることが好ましい。 The acryloxy group-containing compound, the methacryloxy group-containing compound, or the epoxy group-containing compound is generally 0.5 to 5.0 parts by mass, particularly 1.0 to 100 parts by mass of the ethylene-vinyl acetate copolymer. It is preferable that -4.0 mass part is contained.
更に、表面側封止膜及び裏面側封止膜は、光安定剤を含んでいてもよい。 Furthermore, the front side sealing film and the back side sealing film may contain a light stabilizer.
光安定剤を含有させることによって、照射された光などの影響によってエチレン−酢酸ビニル共重合体が劣化し、太陽電池用封止膜が黄変するのを更に抑制することができる。 By containing the light stabilizer, it is possible to further suppress the deterioration of the ethylene-vinyl acetate copolymer due to the influence of the irradiated light and the like, and the yellowing of the solar cell sealing film.
光安定剤としてはヒンダードアミン系と呼ばれる光安定剤を用いることが好ましく、例えば、ＬＡ−５２、ＬＡ−５７、ＬＡ−６２、ＬＡ−６３ＬＡ−６３ｐ、ＬＡ−６７、ＬＡ−６８（いずれも株式会社ＡＤＥＫＡ製）、Ｔｉｎｕｖｉｎ７４４、Ｔｉｎｕｖｉｎ ７７０、Ｔｉｎｕｖｉｎ ７６５、Ｔｉｎｕｖｉｎ１４４、Ｔｉｎｕｖｉｎ ６２２ＬＤ、ＣＨＩＭＡＳＳＯＲＢ ９４４ＬＤ（いずれもチバ・スペシャルティ・ケミカルズ株式会社製）、ＵＶ−３０３４（Ｂ．Ｆ．グッドリッチ社製）等を挙げることができる。なお、上記光安定剤は、単独で使用しても、２種以上組み合わせて用いてもよく、その配合量は、エチレン−酢酸ビニル共重合体１００質量部に対して０．０１〜５質量部であることが好ましい。 As the light stabilizer, a light stabilizer called a hindered amine is preferably used. For example, LA-52, LA-57, LA-62, LA-63LA-63p, LA-67, LA-68 (all ADEKA), Tinuvin 744, Tinuvin 770, Tinuvin 765, Tinuvin 144, Tinuvin 622LD, CHIMASSORB 944LD (all manufactured by Ciba Specialty Chemicals Co., Ltd.), UV-3034 (manufactured by BF Goodrich). it can. In addition, the said light stabilizer may be used individually or may be used in combination of 2 or more types, and the compounding quantity is 0.01-5 mass parts with respect to 100 mass parts of ethylene-vinyl acetate copolymers. It is preferable that
更に、表面側封止膜及び裏面側封止膜は、老化防止剤を含んでいてもよい。老化防止剤としては、例えばＮ，Ｎ’−ヘキサン−１，６−ジイルビス〔３−（３，５−ジ−ｔｅｒｔ−ブチル−４−ヒドロキシフェニル）プロピオナミド〕等のヒンダードフェノール系酸化防止剤、リン系熱安定剤、ラクトン系熱安定剤、ビタミンＥ系熱安定剤、イオウ系熱安定剤等が挙げられる。 Furthermore, the front surface side sealing film and the back surface side sealing film may contain an anti-aging agent. Examples of the antioxidant include hindered phenolic antioxidants such as N, N′-hexane-1,6-diylbis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionamide], Examples thereof include phosphorus heat stabilizers, lactone heat stabilizers, vitamin E heat stabilizers, and sulfur heat stabilizers.
上述した太陽電池用表面側封止膜及び裏面側封止膜を形成するには、公知の方法に準じて行えばよい。例えば、上述した各成分を含む組成物を、通常の押出成形、又はカレンダ成形（カレンダリング）等により成形してシート状物を得る方法により製造することができる。また、前記組成物を溶剤に溶解させ、この溶液を適当な塗布機（コーター）で適当な支持体上に塗布、乾燥して塗膜を形成することによりシート状物を得ることもできる。尚、製膜時の加熱温度は、架橋剤が反応しない或いはほとんど反応しない温度とすることが好ましい。例えば、５０〜９０℃、特に４０〜８０℃とするのが好ましい。本発明の太陽電池用封止膜の厚さは特に制限されないが、０．０５〜２ｍｍである。 What is necessary is just to perform according to a well-known method in order to form the surface side sealing film for solar cells mentioned above, and a back surface side sealing film. For example, the composition containing each of the above-described components can be produced by a method of obtaining a sheet-like material by molding by ordinary extrusion molding, calendar molding (calendering) or the like. Alternatively, a sheet-like material can be obtained by dissolving the composition in a solvent and coating the solution on a suitable support with a suitable coating machine (coater) and drying to form a coating film. The heating temperature during film formation is preferably a temperature at which the crosslinking agent does not react or hardly reacts. For example, it is preferably 50 to 90 ° C, particularly 40 to 80 ° C. Although the thickness in particular of the sealing film for solar cells of this invention is not restrict | limited, It is 0.05-2 mm.
［太陽電池］
本発明の太陽電池の構造は、表面側透明保護部材、表面側封止膜、太陽電池用セル、裏面側封止膜及び裏面側保護部材がこの順で積層され、且つ前記太陽電池用セルが所定の位置にセル止めテープで仮止めされた積層体を、架橋一体化させることにより前記太陽電池用セルを封止してなる太陽電池である。なお、本発明において、太陽電池用セルの光が照射される側（受光面側）を「表面側」と称し、太陽電池用セルの受光面とは反対面側を「裏面側」と称する。
[Solar cell]
The structure of the solar cell of the present invention is such that the front-side transparent protective member, the front-side sealing film, the solar cell, the back-side sealing film and the back-side protective member are laminated in this order, and the solar cell is It is a solar cell formed by sealing the solar cell by cross-linking and integrating the laminate temporarily fixed with a cell stopper tape at a predetermined position. In addition, in this invention, the side (light-receiving surface side) where the light of the solar cell is irradiated is referred to as “front surface side”, and the surface opposite to the light-receiving surface of the solar cell is referred to as “back surface side”.
前記太陽電池において、太陽電池用セルを十分に封止するには、例えば、図１に示すように表面側透明保護部材１１、表面側封止膜１３Ａ、太陽電池用セル１４、裏面側封止膜１３Ｂ及び裏面側保護部材１２を積層し、加熱加圧など常法に従って、封止膜を架橋硬化させればよい。積層時に太陽電池用セル１４を配置する際には、図２に示すように、セル止めテープ１６を隣接する太陽電池用セル１４同士に貼付して仮固定を行う。なお、接続タブ１５により連結された複数の太陽電池用セル１４連結体は、導電バー１７によって隣り合う複数の太陽電池セル１４連結体に電気的に接続される。
In the solar cell, in order to sufficiently seal the solar cell, for example, as shown in FIG. 1, the front surface side transparent
加熱加圧するには、例えば、前記積層体を、真空ラミネータで温度１３５〜１８０℃、さらに１４０〜１８０℃、脱気時間０．１〜５分、プレス圧力０．１〜１．５ｋｇ／ｃｍ2、プレス時間５〜１５分で加熱圧着すればよい。この加熱加圧時に、表面側封止膜１３Ａおよび裏面側封止膜１３Ｂに含まれるエチレン−酢酸ビニル共重合体を架橋させることにより、表面側封止膜１３Ａおよび裏面側封止膜１３Ｂを介して、表面側透明保護部材１１、裏面側透明部材１２、および太陽電池用セル１４を一体化させて、太陽電池用セル１４を封止することができる。
In order to heat and pressurize, for example, the laminate is heated by a vacuum laminator at a temperature of 135 to 180 ° C., further 140 to 180 ° C., a degassing time of 0.1 to 5 minutes, and a press pressure of 0.1 to 1.5 kg / cm 2. What is necessary is just to heat-press in press time 5-15 minutes. By crosslinking the ethylene-vinyl acetate copolymer contained in the front side sealing film 13A and the back side sealing film 13B during the heating and pressurization, the front side sealing film 13A and the back side sealing film 13B are interposed. And the surface side
本発明の太陽電池に使用される表面側透明保護部材１１は、通常珪酸塩ガラスなどのガラス基板であるのがよい。ガラス基板の厚さは、０．１〜１０ｍｍが一般的であり、０．３〜５ｍｍが好ましい。ガラス基板は、一般に、化学的に、或いは熱的に強化させたものであってもよい。
The surface side transparent
本発明で使用される裏面側保護部材１２は、ポリエチレンテレフタレート（ＰＥＴ）などのプラスチックフィルムが好ましく用いられる。裏面側保護部材１２には、白色顔料が含まれていてもよい。これにより、透過する太陽光を反射させて太陽電池用セルに入射させることができ、発電効率が向上する。耐熱性、耐湿熱性を考慮してフッ化ポリエチレンフィルム、特にフッ化ポリエチレンフィルム／Ａｌ／フッ化ポリエチレンフィルムをこの順で積層させたフィルムでも良い。
The back surface side
本発明の太陽電池に使用されるセル止めテープとしては、ＰＥＴ等のポリエステル樹脂フィルムに粘着剤層が形成されたものを用いる。耐熱性に優れる。また、粘着剤層を形成する粘着剤としては、アクリル系やシリコン系等の粘着剤が挙げられる。
The cell sealing tape used for the solar cell of the present invention, Ru used as the pressure-sensitive adhesive layer is formed on a polyester resin film such as PET. Ru is excellent in heat resistance. Moreover, as an adhesive which forms an adhesive layer, adhesives, such as an acrylic type and a silicon type, are mentioned.
セル止めテープの厚さは一般に１０〜１０００μｍである。また、セル止めテープの粘着剤層の厚さは一般に１×１０２〜１×１０５ｎｍ程度であればよい。セル止めテープの大きさは特に限定されず、太陽電池用セル同士を仮止めできる大きさであればよい。 The thickness of the cell stopper tape is generally 10 to 1000 μm. Moreover, generally the thickness of the adhesive layer of a cell stop tape should just be about 1 * 10 < 2 > -1 * 10 < 5 > nm. The size of the cell stopper tape is not particularly limited as long as it can temporarily fix the cells for solar cells.
セル止めテープは、一般に、表面側透明保護部材上に表面側封止膜を積層して、太陽電池用セルを所定の位置に載置した後、その位置を固定するために、図２に示すように隣接する太陽電池用セル１４の裏面側の端部に貼付して使用される。その後、裏面側封止膜を太陽電池用セル上に積層し、次いでその裏面側封止膜上に裏面側保護部材（バックシート）を積層することにより、架橋前の積層体が得られる。なお、セル止めテープの貼付箇所は、図２に示す例に限られることはなく、太陽電池用セルを所定位置に固定できる箇所ではればどのような箇所でもよい。例えば、太陽電池用セル１４の表面側（受光面側）に貼付してもよいし、太陽電池用セル１４と表面側封止膜１３Ｂに跨って貼付してもよい。このように貼付されたセル止めテープは太陽電池の表面側から視認されることになる。
The cell stopper tape is generally shown in FIG. 2 in order to fix the position after laminating the surface side sealing film on the surface side transparent protective member and placing the solar cell in a predetermined position. Thus, it is used by being attached to the end portion on the back surface side of the adjacent
本発明の太陽電池は、上述した通り、表面側及び裏面側に用いられる封止膜に特徴を有する。したがって、表面側透明保護部材、裏面側保護部材、および太陽電池用セル、セル止めテープ等の前記封止膜以外の部材については、従来公知の太陽電池と同様の構成を有していればよく、特に制限されない。 As described above, the solar cell of the present invention is characterized by the sealing film used on the front surface side and the back surface side. Therefore, the members other than the sealing film, such as the front surface side transparent protective member, the back surface side protective member, and the solar cell, the cell stopper tape, or the like only have to have the same configuration as a conventionally known solar cell. There is no particular restriction.
以下、本発明を実施例により説明する。 Hereinafter, the present invention will be described with reference to examples.
（実施例１〜９、比較例１〜１４）
(Examples 1-9, Comparative Example 1 to 14)
＜裏面側封止膜の作製＞
・ＥＶＡ１００質量部、架橋剤（２，５−ジメチル−２，５−ジ（ｔ−ブチルパーオキシ）ヘキサン）１．３質量部、架橋助剤（トリアリルイソシアヌレート）２．０質量部、接着性向上剤（γ−メタクリロキシプロピルトリメトキシシラン）０．５質量部と、表１及び２に示す添加剤（白色顔料又は紫外線吸収剤）を表示した量で配合した材料を、ロールミルに供給し、７０℃において混練して太陽電池用封止膜組成物を調製した。この太陽電池用封止膜組成物を、７０℃においてカレンダ成形し、放冷後、裏面側封止膜（厚さ０．５ｍｍ）を得た。
<Preparation of back side sealing film>
EVA 100 parts by mass, crosslinking agent (2,5-dimethyl-2,5-di (t-butylperoxy) hexane) 1.3 parts by mass, crosslinking aid (triallyl isocyanurate) 2.0 parts by mass, adhesion A material containing 0.5 parts by mass of a property improver (γ-methacryloxypropyltrimethoxysilane) and an additive (white pigment or ultraviolet absorber) shown in Tables 1 and 2 is supplied to a roll mill. The solar cell encapsulating film composition was prepared by kneading at 70 ° C. This solar cell sealing film composition was calendered at 70 ° C., allowed to cool, and a back side sealing film (thickness 0.5 mm) was obtained.
（１）発泡までの時間（分）
図３（ａ）に示すように、白板ガラス２１／上記表面側封止膜２３Ａ／アルミニウム板２７／ＰＥＴ２６／上記裏面側封止膜２３Ｂ／裏面側保護部材（バックシート）２２の順で積層し、１００℃に設定した真空ラミネータで１０分加圧して仮圧着して得た積層体を、１４０℃に設定したオーブンに入れ、発泡するまでの時間を測定した。
(1) Time to foam (minutes)
As shown in FIG. 3A, lamination is performed in the order of white plate glass 21 / front surface
（２）表面側封止膜の黄変度（ΔＹＩ）
図３（ｂ）に示すように、白板ガラス２１／上記表面側封止膜２３Ａ／白板ガラス２１の順で積層し、１００℃に設定した真空ラミネータで１０分間加圧して仮圧着して得た積層体を、１５５℃に設定したオーブンに入れ、４５分架橋させた。これにより得たサンプルについて、ｓ−ＵＶ照射試験機（アイスーパーＵＶテスター（岩崎電気社製）を用いて、光源としてメタルハライドランプを使用して、照射強度１０００Ｗ／ｍ２で紫外線を３００時間照射した。紫外線照射後の黄色度（ＹＩ）と照射前の黄色度（ＹＩ）を、カラーメーター（ＨＺ−２、スガ試験機株式会社製）を用いて、ＪＩＳ−Ｋ−７１０５（１９８１）に準拠して測定し、その差である黄変度（ΔＹＩ）を算出した。
(2) Yellowing degree of surface side sealing film (ΔYI)
As shown in FIG.3 (b), it laminated | stacked in order of the white plate glass 21 / the said surface
（３）架橋速度（分）
上記で作成した表面側封止膜をオーブンにて、１５５℃で架橋反応を行い、一定時間毎に約１ｇ精秤し、ソックスレー抽出器を用いて熱キシレンで８時間抽出処理した後、生じたゲル成分を８０℃で１２時間以上乾燥して秤量した。封止膜に対するゲル成分の質量％を算出し、その数値が８０％に達する架橋時間を架橋速度とした。
(3) Crosslink rate (min)
The surface-side sealing film prepared above was subjected to a crosslinking reaction at 155 ° C. in an oven, precisely weighed about 1 g at regular intervals, and extracted after 8 hours with hot xylene using a Soxhlet extractor. The gel component was dried at 80 ° C. for 12 hours or more and weighed. The mass% of the gel component with respect to the sealing film was calculated, and the crosslinking time when the numerical value reached 80% was defined as the crosslinking rate.
（４）セル止めテープの黄変度（ΔＹＩ）
図３（ｃ）に示すように、白板ガラス２１／上記表面側封止膜２３Ａ／ＰＥＴ２６／上記表面側封止膜２３Ａ／白板ガラス２１の順で積層し、１００℃に設定した真空ラミネータで１０分間加圧して仮圧着して得た積層体を、１５５℃に設定したオーブンに入れ、４５分架橋させた。これにより得たサンプルについて、ｓ−ＵＶ照射試験機（アイスーパーＵＶテスター（岩崎電気社製）を用いて、光源としてメタルハライドランプを使用して、照射強度１０００Ｗ／ｍ２で紫外線を２４時間照射した。紫外線照射後の黄色度（ＹＩ）と照射前の黄色度（ＹＩ）を、カラーメーター（ＨＺ−２、スガ試験機株式会社製）を用いて、ＪＩＳ−Ｋ−７１０５（１９８１）に準拠して測定し、その差である黄変度（ΔＹＩ）を算出した。
(4) Yellowing degree of cell stopper tape (ΔYI)
As shown in FIG. 3C, the white plate glass 21 / the surface
（５）表面側封止膜の波長４００ｎｍの透過率（％）
図３（ｂ）に示すように、白板ガラス２１／上記表面側封止膜２３Ａ／白板ガラス２１の順で積層し、１００℃に設定した真空ラミネータで１０分間加圧して仮圧着して得た積層体を、１５５℃に設定したオーブンに入れ、４５分架橋させた。これにより得たサンプルについて、波長４００ｎｍにおける透過率を分光光度計（日立製作所製；Ｕ−４０００）により測定した。
(5) Transmittance (%) at a wavelength of 400 nm of the surface side sealing film
As shown in FIG.3 (b), it laminated | stacked in order of the white plate glass 21 / the said surface
（６）裏面側保護部材の黄変度（ΔＹＩ）
図３（ｄ）に示すように、白板ガラス２１／上記表面側封止膜２３Ａ／上記裏面側封止膜２３Ｂ／裏面側保護部材２２の順で積層し、１００℃に設定した真空ラミネータで１０分間加圧して仮圧着して得た積層体を、１５５℃に設定したオーブンに入れ、４５分架橋させた。これにより得たサンプルについて、ｓ−ＵＶ照射試験機（アイスーパーＵＶテスター（岩崎電気社製）を用いて、光源としてメタルハライドランプを使用して、照射強度１０００Ｗ／ｍ２で紫外線を３００時間照射した。紫外線照射後の黄色度（ＹＩ）と照射前の黄色度（ＹＩ）を、カラーメーター（ＨＺ−２、スガ試験機株式会社製）を用いて、ＪＩＳ−Ｋ−７１０５（１９８１）に準拠して測定し、その差である黄変度（ΔＹＩ）を算出した。
(6) Yellowing degree (ΔYI) of the back side protection member
As shown in FIG. 3 (d), the white plate glass 21 / the front surface
（７）裏面側封止膜の反射率（％）
白色顔料を添加した裏面側封止膜（実施例１〜７、比較例１〜９）について、図３（ｅ）に示すように、裏面側封止膜２３Ｂと黒色遮蔽材２８を積層し、１００℃に設定した真空ラミネータで１０分間加圧して仮圧着して得た積層体を、１５５℃に設定したオーブンに入れ、４５分架橋させた。これにより得たサンプルについて、波長３００〜４００ｎｍにおける反射率を分光光度計（日立製作所製；Ｕ−４０００）により測定した。
(7) Reflectivity of back side sealing film (%)
For the backside sealing films (Examples 1-7, Comparative Examples 1-9) to which the white pigment is added, as shown in FIG. 3 (e), the backside sealing film 23B and the
なお、上記（１）〜（７）では、表面側透明保護部材として白板ガラス板、裏面側保護部材として白色顔料含有ＰＥＴ、セル止めテープとしてＰＥＴを用いた。各部材の寸法は以下の通りである。
・ガラス板（５０ｍｍ×５０ｍｍ、厚さ：３ｍｍ）
・裏面側保護部材（５０ｍｍ×５０ｍｍ、厚さ：３５０μｍ）
・ＰＥＴ（２０ｍｍ×１０ｍｍ、厚さ：５０μｍ）
・アルミニウム板（３０ｍｍ×３０ｍｍ、厚さ：２００μｍ）
・黒色遮蔽材（５０ｍｍ×５０ｍｍ、厚さ：０．５ｍｍ）
In the above (1) to (7), a white glass plate was used as the front surface side transparent protective member, white pigment-containing PET was used as the back surface side protective member, and PET was used as the cell stopper tape. The dimensions of each member are as follows.
・ Glass plate (50mm x 50mm, thickness: 3mm)
・ Back side protection member (50mm x 50mm, thickness: 350μm)
・ PET (20mm × 10mm, thickness: 50μm)
・ Aluminum plate (30mm × 30mm, thickness: 200μm)
・ Black shielding material (50mm x 50mm, thickness: 0.5mm)
＜総合判定＞
上記（１）〜（７）の評価を表３に示す基準でそれぞれ判定し、合計７つの評価のうち、×を１つでも有するもの、又は△が３つ以上あるものを総合判定×とし、それ以外のものを○とした。
<Comprehensive judgment>
Each of the above evaluations (1) to (7) is determined based on the criteria shown in Table 3, and among the total of seven evaluations, one having at least one x, or one having three or more Δs is regarded as a comprehensive determination x. Other than that, it was rated as ○.
備考）
＊１： ＥＶＡの酢酸ビニル含有量は２６質量％である。
＊２： ２，５−ジメチル−２，５−ジ（ｔ−ブチルパーオキシ）ヘキサン（パーヘキサ２５Ｂ：日本油脂（株）製）
＊３： ｔ−ブチルパーオキシ−２−エチルヘキシルモノカーボネート
＊４： トリアリルイソシアヌレート
＊５： γ−メタクリロキシプロピルトリメトキシシラン
＊６： ２−ヒドロキシ−４−ｎ−オクトキシベンゾフェノン（スミソーブ１３０：住友化学（株）製）
＊７： ２，２'−ジヒドロキシ−４，４'−ジメトキシベンゾフェノン
＊８： 二酸化チタン微粒子（平均粒径：２５０ｎｍ）
＊９： 二酸化チタン微粒子（平均粒径：２００ｎｍ）
Remarks)
* 1: The vinyl acetate content of EVA is 26% by mass.
* 2: 2,5-Dimethyl-2,5-di (t-butylperoxy) hexane (Perhexa 25B: manufactured by NOF Corporation)
* 3: t-Butylperoxy-2-ethylhexyl monocarbonate * 4: Triallyl isocyanurate * 5: γ-methacryloxypropyltrimethoxysilane * 6: 2-hydroxy-4-n-octoxybenzophenone (Sumisorb 130: (Sumitomo Chemical Co., Ltd.)
* 7: 2,2′-dihydroxy-4,4′-dimethoxybenzophenone * 8: Titanium dioxide fine particles (average particle size: 250 nm)
* 9: Titanium dioxide fine particles (average particle size: 200 nm)
（評価結果）
表１及び表２に示されているように、架橋剤Ａの添加量が１．２質量部未満である場合には架橋速度が低下していた。架橋剤Ａの添加量が２．５質量部より多い場合には発泡するまでの時間が早く、表面側封止膜が黄変した。紫外線吸収剤Ａの添加量が０．０１５質量部未満の場合には、紫外線透過量が多いため仮止めテープの黄変が生じていた。紫外線吸収剤Ａの添加量が０．０５質量部より多い場合には、表面側封止膜の黄変が生じていた。また、架橋剤Ａと紫外線吸収剤Ａの組合せ以外の場合には、発泡又は仮止めテープの黄変の点で評価が低かった。
(Evaluation results)
As shown in Tables 1 and 2, when the addition amount of the crosslinking agent A was less than 1.2 parts by mass, the crosslinking rate was reduced. When the addition amount of the crosslinking agent A was more than 2.5 parts by mass, the time until foaming was early, and the surface side sealing film was yellowed. When the addition amount of the ultraviolet absorber A was less than 0.015 parts by mass, the temporary fixing tape was yellowed because of the large amount of transmitted ultraviolet rays. When the addition amount of the ultraviolet absorber A was more than 0.05 parts by mass, the surface side sealing film was yellowed. Further, in cases other than the combination of the crosslinking agent A and the ultraviolet absorber A, the evaluation was low in terms of foaming or yellowing of the temporary fixing tape.
更に、裏面側封止膜に配合した紫外線吸収剤Ａの量が０．２未満である場合には、裏面側保護部材の黄変が生じていた。また、裏面側封止膜に配合した白色顔料の平均粒径が２００ｎｍの場合には３００〜４００ｎｍにおける反射率が向上していた。 Furthermore, when the amount of the ultraviolet absorber A blended in the back side sealing film was less than 0.2, the back side protective member was yellowed. Moreover, the reflectance in 300-400 nm was improving when the average particle diameter of the white pigment mix | blended with the back surface side sealing film is 200 nm.
本発明によれば、表面側封止膜、セル止めテープ及び裏面側保護部材の黄変が防止され、架橋時の発泡が抑制され、架橋速度が良好であるので、外観特性が高く、生産性が良好であり、発電効率の向上した太陽電池を得ることが可能である。 According to the present invention, yellowing of the front side sealing film, the cell stopper tape and the back side protective member is prevented, foaming during crosslinking is suppressed, and the crosslinking rate is good, so that the appearance characteristics are high and the productivity is high. It is possible to obtain a solar cell with good power generation efficiency.
１１ 表面側透明保護部材
１２ 裏面側保護部材
１３Ａ 表面側封止膜
１３Ｂ 裏面側封止膜
１４ 太陽電池用セル
１５ 接続タブ
１６ セル止めテープ
１７ 導電バー
２１ ガラス板（表面側透明保護部材）
２２ 白色顔料を含むＰＥＴ（裏面側保護部材）
２３Ａ 表面側封止膜
２３Ｂ 裏面側封止膜
２６ ＰＥＴ
２７ アルムニウム板
２８ 黒色遮蔽材
DESCRIPTION OF
22 PET containing white pigment (back side protection member)
23A Front side sealing film 23B Back
27
Claims (7)
エチレン−酢酸ビニル共重合体、架橋剤及び紫外線吸収剤を含み、
前記架橋剤が２，５−ジメチル−２，５−ジ（ｔ−ブチルパーオキシ）ヘキサンであり、前記エチレン−酢酸ビニル共重合体１００質量部に対して１．３〜２．０質量部含み、
前記紫外線吸収剤が２−ヒドロキシ−４−ｎ−オクトキシベンゾフェノンであり、前記エチレン−酢酸ビニル共重合体１００質量部に対して０．０１５〜０．０５質量部含み、
前記セル止めテープが、ポリエステル樹脂フィルムの表面に粘着剤層を有するテープであることを特徴とする太陽電池用表面側封止膜。 A front surface side transparent protective member, a front surface side sealing film, a solar cell, a back surface side sealing film, and a back surface side protective member are laminated in this order, and the solar cell is temporarily attached to a predetermined position with a cell stopper tape. The surface-side sealing film used for a solar cell obtained by sealing the solar cell by cross-linking and integrating the stopped laminate,
Including an ethylene-vinyl acetate copolymer, a crosslinking agent and an ultraviolet absorber;
The cross-linking agent is 2,5-dimethyl-2,5-di (t-butylperoxy) hexane and includes 1.3 to 2.0 parts by mass with respect to 100 parts by mass of the ethylene-vinyl acetate copolymer. ,
The ultraviolet absorber is 2-hydroxy-4-n-octoxybenzophenone, and 0.015-0.05 parts by mass with respect to 100 parts by mass of the ethylene-vinyl acetate copolymer;
The cell- side sealing tape is a tape having a pressure-sensitive adhesive layer on the surface of a polyester resin film .
前記表面側封止膜として、請求項１に記載の太陽電池用表面側封止膜を用い、
前記セル止めテープが、ポリエステル樹脂フィルムの表面に粘着剤層を有するテープであることを特徴とする太陽電池。 A front surface side transparent protective member, a front surface side sealing film, a solar cell, a back surface side sealing film, and a back surface side protective member are laminated in this order, and the solar cell is temporarily attached to a predetermined position with a cell stopper tape. A solar cell formed by sealing the solar cell by cross-linking the stopped laminate,
As the surface side sealing film, using the surface side sealing film for solar cells according to claim 1,
The cell-stopping tape is a tape having an adhesive layer on the surface of a polyester resin film .
前記紫外線吸収剤が、前記エチレン−酢酸ビニル共重合体１００質量部に対して、０．２〜０．５質量部含むことを特徴とする請求項２又は３に記載の太陽電池。 The back side sealing film contains an ethylene-vinyl acetate copolymer, a crosslinking agent and an ultraviolet absorber;
The ultraviolet absorber, the ethylene - the vinyl acetate copolymer 100 parts by weight, the solar cell according to claim 2 or 3, characterized in that it comprises 0.2 to 0.5 parts by weight.
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| JP2011131839A JP5788721B2 (en) | 2011-06-14 | 2011-06-14 | Solar cell sealing film and solar cell using the same |
| PCT/JP2012/064354 WO2012173006A1 (en) | 2011-06-14 | 2012-06-04 | Solar battery sealing film and solar battery using same |
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| JP2011131839A JP5788721B2 (en) | 2011-06-14 | 2011-06-14 | Solar cell sealing film and solar cell using the same |
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| PL3020777T3 (en) | 2013-08-16 | 2021-01-25 | Lg Chem, Ltd. | Seal tape |
| ITBO20130477A1 (en) * | 2013-09-06 | 2015-03-07 | Carlo Dallari | PHOTOVOLTAIC MODULE FOR THE PRODUCTION OF ELECTRIC ENERGY FROM SOLAR ENERGY |
| ITBO20130645A1 (en) * | 2013-11-25 | 2015-05-26 | Carlo Dallari | PHOTOVOLTAIC MODULE FOR THE PRODUCTION OF ELECTRIC ENERGY FROM SOLAR ENERGY |
| KR101862906B1 (en) * | 2015-04-29 | 2018-05-30 | 주식회사 엘지화학 | Portable terminal including organic solar cell module |
| FR3071682A1 (en) * | 2017-09-28 | 2019-03-29 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | METHOD FOR MANUFACTURING A PHOTOVOLTAIC MODULE WITH CONTROL OF THE INTER-SERIAL DISTANCE OF PHOTOVOLTAIC CELLS |
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| JP4207456B2 (en) * | 2002-02-27 | 2009-01-14 | 株式会社ブリヂストン | Solar cell module and temporary fixing tape therefor |
| JP5385666B2 (en) * | 2009-04-08 | 2014-01-08 | 株式会社ブリヂストン | Manufacturing method of solar cell module |
| JP5517121B2 (en) * | 2009-09-17 | 2014-06-11 | 日立マクセル株式会社 | Method for producing sealing material film for solar cell module |
| JP2011111515A (en) * | 2009-11-26 | 2011-06-09 | Bridgestone Corp | Sealing film for solar cell and solar cell |
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