JP2012138467A - Solar battery sealing material, and solar battery module using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar battery sealing material having transparency, flexibility, adhesion with various materials, and thermal resistance against the rise in temperature at the time of generating power, and a solar battery module using the solar battery sealing material.SOLUTION: The solar battery sealing material comprises: (A) an ethylene-unsaturated carboxylic acid copolymer in which the content of unsaturated carboxylic acid in the copolymer is 3-30 mass%, and which has a melting point of 50-105°C, (B) an ionomer of ethylene-unsaturated carboxylic acid copolymer in which the content of unsaturated carboxylic acid in the copolymer is 3-30 mass%, and which has a degree of neutralization of 5-40%, and a melting point of 50-105°C, (C) a multifunctional monomer having more than one unsaturated double bond, (D) a multifunctional monomer consisting of a mixture of a multifunctional monomer having more than one unsaturated double bond, and a silane coupling agent having more than one alkoxyl group, and (E) an organic peroxide. The solar battery sealing material includes: 100 pts.wt. of resin of (A) and/or (B), 0.03-5.0 pts.wt. of the multifunctional monomer of (C) or (D), and 0.01-3.0 pts.wt. of the organic peroxide of (E).

Description

  The present invention relates to a solar cell sealing material and a solar cell module using the same, and more specifically, a solar cell sealing material excellent in transparency, heat resistance, adhesion, and the like, and a solar cell module using the solar cell sealing material. It is about.

  In the present specification, “ratio”, “part”, “%” and the like indicating the composition are based on mass unless otherwise specified. “EVA” is “ethylene-vinyl acetate copolymer”, “MAA” is “methacrylic acid”, “EMAA” is “ethylene-methacrylic acid copolymer”, and “EMAA-Metal” is “ethylene-methacrylic acid”. “Ionomer of copolymer”, “ETFE” is an abbreviation, functional expression, common name, or industry term for “ethylene-tetrafluoroethylene copolymer”.

  The solar cell module is packaged by wiring the solar cell element with conductive metal, fixing the solar cell element with wiring with a sealing material so that it is sandwiched between protective materials consisting of a front transparent protective material and a back protective material It is a thing. For this reason, as solar cell sealing materials, in general, transparency that allows sunlight to pass through, flexibility for physically protecting solar cell elements, and various materials such as protective glass and metal And heat resistance to withstand temperature rise during power generation is required. A solar cell module using a solar cell sealing material is free from troubles of peeling and deformation during the production of the solar cell module, can be easily manufactured, and can be prevented from flowing and peeling when used as a solar cell. Therefore, it must be usable for a long time. Therefore, solar cell sealing materials are required to have transparency, flexibility to protect solar cell elements, adhesion to various materials such as glass and metal, and heat resistance that can withstand temperature rise during power generation. ing.

JP 2000-186114 A

Conventionally, a crosslinked EVA obtained by adding an organic peroxide, a polyfunctional monomer, and a silane coupling agent to an ethylene-vinyl acetate copolymer (EVA) is known as a solar cell sealing material. However, although crosslinked EVA is relatively excellent in transparency, flexibility, heat resistance and glass adhesion, it is inferior in metal adhesion, and an acetic acid residue is hydrolyzed under high temperature and high humidity such as in use. , The solar cell element and the transparent electrode are corroded, and the power generation performance is reduced.
In addition, as a solar cell sealing material having excellent metal adhesion, an ionomer resin obtained by partially neutralizing an ethylene- (meth) acrylic acid copolymer is known (for example, see Patent Document 1). However, although ionomer resin is relatively excellent in transparency, flexibility, and metal adhesion, it does not have sufficient adhesion to glass, does not use organic peroxide, etc., and is not crosslinked, so it has insufficient heat resistance However, when the degree of neutralization is increased in order to improve heat resistance, there is a problem that metal adhesion is lowered.

  In order to solve the above-described problems, the present inventors have made extensive studies and have completed the present invention. Its purpose is solar cell sealing material that has transparency, flexibility to protect solar cell elements, adhesion to various materials such as glass and metal, and heat resistance that can withstand temperature rise during power generation And a solar cell module using the same.

In order to solve the above problems, the solar cell encapsulating material according to the invention of claim 1 of the present invention comprises 100 parts by mass of the resin (A) and / or the resin (B), the polyfunctional monomer (C) or It is a sealing material for a solar cell module composed of 0.03-5.0 parts by mass of a polyfunctional monomer (D) and 0.01-3.0 parts by mass of an organic peroxide (E). The resin (A) is an ethylene-unsaturated carboxylic acid copolymer having an unsaturated carboxylic acid content of 3 to 30% by mass and a melting point of 50 to 105 ° C. in the copolymer, and the resin (B) is a copolymer. An ionomer of an ethylene-unsaturated carboxylic acid copolymer having an unsaturated carboxylic acid content of 3 to 30% by mass, a neutralization degree of 5 to 40%, and a melting point of 50 to 105 ° C. The monomer (C) is a polyfunctional monomer having a plurality of unsaturated double bonds, A sealing material characterized in that the polyfunctional monomer (D) is a polyfunctional monomer that is a mixture of a polyfunctional monomer having a plurality of unsaturated double bonds and a silane coupling agent having a plurality of alkoxyl groups. is there.
A solar cell sealing material according to a fourth aspect of the present invention is the solar cell sealing material according to the first to third aspects, wherein the silane coupling agent is a silane coupling agent having an epoxy group or a silane coupling agent having an unsaturated double bond. Is.
The solar cell module according to the invention of claim 5 uses the solar cell sealing material according to any one of claims 1 to 4.

  According to the present invention, transparency that allows sunlight to pass through, flexibility for physically protecting the solar cell element, adhesion to various materials such as glass and metal of the protective material, and power generation Has the effect of excellent heat resistance that can withstand temperature rise, and has no trouble of peeling or deformation when manufacturing a solar cell module, is easy to manufacture, and avoids flow or peeling when used as a solar cell. Can be used for a long period of time.

It is sectional drawing which shows one Example of the solar cell module of this invention. It is sectional drawing which shows one Example of the solar cell module of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  (Solar Cell Module) As shown in FIG. 1, the solar cell module 10 of the present invention has a configuration in which the solar cell 11 provided with the wiring 13 is sandwiched between the front transparent protective material 23A and the back protective material 23B. , And sealed through the front sealing material 21A and the back sealing material 21B. FIG. 2 shows a thin-film solar cell module in which functional parts such as a photoelectric conversion layer 43, a surface electrode layer (transparent electrode) 41, and a back electrode 45 are provided on the front transparent protective material 23A. The protective material 23B is sealed with the solar cell sealing material 21. The solar cell module 10 of the present invention may be any solar cell module. In either case, external wiring and the like are omitted. The front sealing material 21A and the back sealing material 21B are collectively referred to as the solar cell sealing material 21.

  (Solar cell sealing material) In the solar cell sealing material 21 of the present invention, the resin (A) and / or the resin (B) is 100 parts by mass, and the polyfunctional monomer (C) or the polyfunctional monomer (D) is 0. 0.03 to 5.0 parts by mass and 0.01 to 3.0 parts by mass of organic peroxide (E), and the resin (A) has an unsaturated carboxylic acid content of 3 in the copolymer. It is an ethylene-unsaturated carboxylic acid copolymer having a melting point of 50 to 105 ° C. at an amount of ˜30% by mass, and the resin (B) has an unsaturated carboxylic acid content in the copolymer of 3 to 30% by mass, An ionomer of an ethylene-unsaturated carboxylic acid copolymer having a degree of 5 to 40% and a melting point of 50 to 105 ° C., wherein the polyfunctional monomer (C) is a polyfunctional monomer having a plurality of unsaturated double bonds, The polyfunctional monomer (D) having a plurality of unsaturated double bonds To the over, the polyfunctional monomer is a mixture of the silane coupling agent having a plurality of alkoxy groups. Moreover, you may use the solar cell sealing material 21 of this invention for both of the front sealing material 21A or the back sealing material 21B, or both.

  (A) Ethylene-unsaturated carboxylic acid copolymer or ethylene-unsaturated carboxylic acid copolymer partially neutralized with metal ions 100 parts by mass of resin component and organic peroxide 0.01 It consists of 0.03 to 5.0 parts by mass and a polyfunctional monomer having an unsaturated double bond or a polyfunctional monomer to which a silane coupling agent is added. The ethylene-unsaturated carboxylic acid copolymer has an unsaturated carboxylic acid content of 5 to 30% by mass and a melting point of 50 to 105 ° C. Such a copolymer has excellent transparency.

  (B) The above-mentioned ionomer has an unsaturated carboxylic acid content in the copolymer of 5 to 30% by mass, a degree of neutralization with metal ions of 5 to 30%, and a melting point of 50 to 105 ° C. The copolymer may be blended with an ionomer resin having a high degree of neutralization to adjust the carboxylic acid content to 5 to 30% by mass, the degree of neutralization to 5 to 30%, and the melting point to 50 to 105 ° C. Such ionomers have excellent transparency.

  Examples of the unsaturated carboxylic acid constituting the copolymer resin and the ionomer resin include acrylic acid and methacrylic acid. In order to improve flexibility, a copolymer obtained by adding a vinyl ester or (meth) acrylic acid ester or the like may be used, or a vinyl ester or (meth) acrylic acid ester may be copolymerized with ethylene. You may blend things. When the content of the unsaturated carboxylic acid in the copolymer is too small, the transparency is inferior, and when it is too large, the hygroscopicity is increased, so that 5 to 30% by mass is preferable, and 8 to 25% by mass is more preferable.

  Examples of the metal species constituting the ionomer resin include alkali metals such as lithium (Li), sodium (Na), and potassium (K), and polyvalent metals such as magnesium (Mg), calcium (Ca), and zinc (Zn). These may be used alone or in combination. When the degree of neutralization is too low, the transparency is inferior, and when it is too high, the adhesion is inferior, so the degree of neutralization is preferably 5 to 30%, more preferably 8 to 25%.

  When the melting point of the copolymer and the ionomer is too low, the handling becomes worse, and when it is too high, lamination becomes difficult, so 50 to 105 ° C is preferable, and 55 to 95 ° C is more preferable. If necessary, vinyl ester or (meth) acrylic acid ester may be added and copolymerized to control the melting point, or a blend of ethylene and vinyl ester or (meth) acrylic acid ester copolymerized Then, the melting point may be controlled.

  (E) If the one-hour half-life temperature of the organic peroxide is too low, it decomposes before the ionomer is sufficiently melted, and if it is too high, it takes too much time for decomposition. -160 degreeC is more preferable, and 100-150 degreeC is especially preferable. If the amount of the organic peroxide is too small, the reaction of the polyfunctional monomer does not proceed. If the amount is too large, there is a possibility that the solar cell sealing material will gel before lamination. -3.0 mass parts is preferable, 0.05-2.5 mass parts is more preferable, 0.1-2.0 mass parts is especially preferable.

  Examples of the organic peroxide include t-butyl peroxyacetate, t-butyl peroxybenzoate, t-amyl peroxyacetate, t-amyl peroxybenzoate, t-butyl peroxy 2-ethylhexyl carbonate, dicumyl per Examples thereof include oxide, di-t-butyl peroxide, di-t-amyl peroxide and the like. One or a plurality of them may be used. Examples of the organic peroxide having a one-hour half-life temperature of 100 to 150 ° C. include 1,1-di (t-butylperoxy) cyclohexane (111 ° C.), 2,2-di (4,4-di- ( t-butylperoxy) cyclohexyl) propane (114 ° C.), t-hexyl peroxyisopropyl monocarbonate (115 ° C.), t-butyl peroxylaurate (118 ° C.), t-butyl peroxyisopropyl monocarbonate (118 ° C.) ), T-butylperoxymaleic acid (119 ° C.), t-butylperoxy-3,5,5-trimethylhexanoate (119 ° C.), t-butylperoxy 2-ethylhexyl monocarbonate (119 ° C.), t-hexylperoxybenzoate (119 ° C.), 2,5-dimethyl-2,5-di (benzoylperoxy) he Sun (119 ° C.), t-butyl peroxyacetate (121 ° C.), 2,2-di (t-butylperoxy) butane (122 ° C.), t-butyl peroxybenzoate (125 ° C.), n-butyl 4 , 4-di- (t-butylperoxy) valerate (127 ° C.), dicumyl peroxide (136 ° C.), di-t-hexyl peroxide (136 ° C.), t-butyl cumyl peroxide (137 ° C.), Examples include di (2-t-butylperoxyisopropyl) benzene (138 ° C.), 2,5-dimethyl-2,5-di (t-butylperoxy) hexane (138 ° C.), and the temperature in parentheses is 1 hour half-life temperature.

  (C, D) If the blending amount of the polyfunctional monomer is too small, it will not lead to improvement in heat resistance and glass adhesion, and if it is too much, unreacted components remain and accelerate deterioration, so that 0.03 to 5 0.0 part by mass is preferable, 0.05 to 4.0 parts by mass is more preferable, and 0.1 to 3.0 parts by mass is particularly preferable.

  The polyfunctional monomer having an unsaturated double bond is a polyfunctional monomer having a plurality of unsaturated double bonds, and polyfunctional arylate, acrylate, methacrylate, or the like can be used. Specific examples include triallyl isocyanurate, triallyl cyanurate, diallyl phthalate, ethylene glycol di (meth) acrylate, hexanediol di (meth) acrylate, and trimethylolpropane trimethacrylate. One or a plurality of them may be used.

  (Silane Coupling Agent) As the silane coupling agent, there is a silane coupling agent having an epoxy group and a vinyl having an unsaturated double bond in that it has graft reactivity to the copolymer or ionomer. , Styryl, methacryloxy and acryloxy silane coupling agents are preferred. One or a plurality of them may be used. Specific examples include vinyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, and 3-methacryloxypropyltrimethoxysilane.

  (Additives) Various additives can be blended in the solar cell sealing material 21 of the present invention as required. As such an additive, when blended with the front sealing material 21A on the front transparent protective material 23A side on the front side of the solar cell element, the transparency may not be impaired, and the back sealing material on the back protective material 23B side. There is no such restriction when blended with 21B. Specific examples include antioxidants, light stabilizers, ultraviolet absorbers, colorants, light diffusing agents, flame retardants, discoloration inhibitors, and nucleating agents for enhancing transparency.

  (Solar cell module) Using the solar cell sealing material 21 of the present invention, the solar cell module 10 can be manufactured by fixing the solar cells 11 with the upper and lower front transparent protective materials 23A and 23B. . For example, a front transparent protective material 23A is laminated on the upper surface of the solar battery cell 11 via a front sealing material 21A, and a rear protective material 23B is laminated on the lower surface via a rear sealing material 21B to form a laminated body. What is necessary is just to make it integrate, crosslinking the front sealing material 21A and the back sealing material 21B by heating under reduced pressure. As the heating conditions at this time, the half-life temperature of the organic peroxide used may be 5 to 10 times the half-life. Note that the solar cell sealing material 21 may be used for either the front sealing material 21A or the rear sealing material 21B, depending on the necessity of the solar cell module.

  (Protective material) For the sake of explanation, the upper and lower front transparent protective materials 23A and the rear protective material 23B are collectively referred to simply as protective materials 23. The protective material 23 may be appropriately selected according to the type of solar battery cell to be used, the type of wiring provided on the element, and the use conditions, and is not particularly limited. For example, the front transparent protective material 23A can be exemplified by glass, acrylic resin, polycarbonate, polyester, fluorine-containing resin, and the like. The back surface protective material 23B can be exemplified by a single-layer or multi-layer sheet of metals such as tin, aluminum, and stainless steel, inorganic materials such as glass, polyester, inorganic material-deposited polyester, fluorine-containing resin, and polyolefin.

  (Manufacturing method) Next, the manufacturing method of the solar cell sealing material 21 is demonstrated. The polyfunctional monomer (C) or (D) is added to the resin (A) and / or (B), an additive is added as necessary, and melt extrusion is performed. For example, the resin (A) and / or ( Extrude with a single screw extruder set at a die temperature about 50 ° C. higher than the melting point of B) to form a sheet. What is necessary is just to impregnate the organic peroxide (E) to the obtained sheet-like material.

  To the resin (A) and / or (B), an organic peroxide (E), an unsaturated double bond selected from the polyfunctional monomer (D) and a silane coupling agent having a plurality of alkoxyl groups are added, After adding an additive as necessary, it is pelletized to obtain a silane-modified resin. The obtained silane-modified resin is further mixed with a resin (A) and / or (B), a polyfunctional monomer (C) or (D), and an additive as necessary, and melt-extruded. Extrude with a single screw extruder set at a die temperature about 50 ° C. higher than the melting point of (A) and / or (B) to form a sheet. What is necessary is just to impregnate the organic peroxide (E) to the obtained sheet-like material.

  It is preferable that the solar cell sealing material 21 can be deaerated between the solar cell 11, the protective material 23, and the solar cell sealing material 21 when a solar cell module is manufactured, and the surface is embossed. May be. Although it does not specifically limit as this embossing method, According to manufacture of the solar cell sealing material 21, for example, in the case of melt extrusion, the cooling roll by which the embossed pattern was given in the molten state immediately after extrusion The solar cell encapsulating material 21 once manufactured may be heated between the rubber roll and the rubber roll, and may be heated again to perform known embossing.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, it is not limited to this. In addition, except a solvent, each composition of each layer is a mass part of solid content conversion.

  First, a resin, a polyfunctional monomer, a silane coupling agent, and an organic peroxide, which are materials to be used, are shown in Table 1. Abbreviations in this table are used in Examples and Comparative Examples.

  (Example 1) 20 parts by mass of the resin (P-1) described in Table 1, 0.1 part by mass of an organic peroxide (O-3) and 0.5 part by mass of a polyfunctional monomer (M-3) And a small amount of antioxidant was added, and then pelletized to obtain a silane-modified resin. Next, 20.6 parts by mass of the obtained silane-modified resin, 80 parts by mass of the resin (P-1) described in Table 1, 0.5 part by mass of the polyfunctional monomer (M-1), and a small amount of stability Agents (UV absorber, HALS, antioxidant) were mixed, a 0.5 mm thick sheet was extruded with a single screw extruder (die temperature set at 140 ° C.), and the organic peroxides (E; O-1) 0.5 mass part was impregnated, and the solar cell sealing material 21 of Example 1 was obtained.

  (Example 2) The same as Example 1 except that the resin (P-1) is changed to the resin (P-2) and the organic peroxide (O-1) is changed to the organic peroxide (O-2). Thus, a solar cell sealing material 21 of Example 2 was obtained.

  (Examples 3 to 6) The resins and polyfunctional monomers listed in Table 1 were added in the materials and proportions listed in Table 2, and a small amount of stabilizer (UV absorber, HALS, antioxidant) was mixed. A 0.5 mm sheet was extruded with a shaft extruder (die set at 160 ° C.) and impregnated with the organic peroxides shown in Table 1 in the materials and proportions shown in Table 2. Solar cell sealing materials of Examples 3 to 6 21 was obtained.

  (Comparative Examples 1-6) Only the resins listed in Table 1 were added in the materials and proportions listed in Table 2, and a small amount of stabilizer (UV absorber, HALS, antioxidant) was mixed, and a single screw extruder. A 0.5 mm sheet was extruded with a die set at 180 ° C. to obtain solar cell sealing materials 21 of Comparative Examples 1 to 6.

(Evaluation)
Evaluation was performed by transparency, heat resistance, glass and metal adhesion.

(Measurement method) The evaluation method is as follows.
(1) Transparency evaluated the solar cell sealing material of thickness 0.5mm by JISK7105 using the Suga Test Instruments haze meter. The light transmittance is preferably 90% or more.
(2) For heat resistance, a solar cell sealing material having a thickness of 0.5 mm is sandwiched between transparent glass plates, set in a vacuum laminator adjusted to the predetermined temperature described in the examples and comparative examples, and evacuation is performed for 5 minutes. And pressurizing for 20 minutes to obtain a laminate. The laminate was tilted at 45 degrees and allowed to stand at 130 ° C. for 12 hours, and then the deviation between the upper and lower glass plates was measured. The deviation is preferably 0.10 mm or less. When the deviation exceeded 10 mm during the measurement, the evaluation was stopped at that time.
(3) Glass adhesion is set in a vacuum laminator adjusted to a predetermined temperature described in Examples and Comparative Examples by sandwiching a solar cell sealing material having a thickness of 0.5 mm between a transparent glass plate and an ETFE film, Vacuuming was performed for 5 minutes and pressurization was performed for 20 minutes to obtain a laminate of glass plate / solar cell sealing material / ETFE film. After removing the ETFE film of this laminate, a part of the solar cell sealing material was peeled from the transparent glass plate, and the adhesion strength between the 10 mm wide solar cell sealing material and the glass plate was measured as a tensilon type. Using a tensile tester, the peel strength when peeled 180 ° at a rate of 50 mm / min at room temperature was measured. The glass adhesion is preferably 20 N / 10 mm width or more.
(4) Metal adhesion is set in a vacuum laminator adjusted to a predetermined temperature described in the examples and comparative examples by sandwiching a solar cell sealing material having a thickness of 0.5 mm between a zinc plate and an ETFE film. Pulling was performed for 5 minutes and pressurization was performed for 20 minutes to obtain a laminate of zinc plate / solar cell sealing material / ETFE film. After removing the ETFE film of this laminate, a part of the solar cell sealing material was peeled off from the zinc plate, and the adhesion strength between the 10 mm wide solar cell sealing material and the zinc plate was measured using a Tensilon type tensile Using a testing machine, the peel strength when peeled 180 degrees at a rate of 50 mm / min at room temperature was measured. The metal adhesion is preferably 20 N / 10 mm width or more, and both the glass adhesion and the metal adhesion are more preferably 20 N / 10 mm width or more.

  (Evaluation results) In Examples 1 to 6, the transparency is good at 92% or more, the heat resistance is good at 0.03 mm or less, the glass adhesion is good at 21 N / 10 mm or more, and the metal adhesion is 20 N / 10 mm or more. Both were good, and in particular, both heat resistance and metal adhesion could be achieved. On the other hand, in Comparative Examples 1 to 6, although transparency is good at 92% or more, heat resistance is bad at 0.1 mm or more, glass adhesion is bad at 17 N / 10 mm or less, and metal adhesion is a comparative example. Although it was good at 38 N / 10 mm or more in 1-2, it was bad at 24 N / 10 mm or less in Comparative Examples 3-6. None of the transparency, heat resistance, glass and metal adhesion were good. In addition, as for glass and metal adhesiveness, vacuum laminating is performed at 140 ° C. in Examples 1-2, 160 ° C. in Examples 3-6, 140 ° C. in Comparative Examples 1 and 2, and 160 ° C. in Comparative Examples 3-6. The evaluation results are shown in Table 3.

  (Industrial Applicability) The present invention can be used for a solar cell sealing material excellent in transparency, heat resistance, adhesion and the like, and a solar cell module using the same.

DESCRIPTION OF SYMBOLS 10: Solar cell module 11: Solar cell 12A, 12B: Electrode layer 13: Wiring 21: Solar cell sealing material 21A: Front surface sealing material 21B: Back surface sealing material 23: Protection material 23A: Front surface transparent protection material 23B: Rear protective material 31: Frame

Claims (5)

  Resin (A) and / or resin (B) is 100 parts by mass, polyfunctional monomer (C) or polyfunctional monomer (D) is 0.03 to 5.0 parts by mass, and organic peroxide (E) is A sealing material for a solar cell module comprising 0.01 to 3.0 parts by mass, wherein the resin (A) has an unsaturated carboxylic acid content in the copolymer of 3 to 30% by mass, a melting point Is an ethylene-unsaturated carboxylic acid copolymer having a temperature of 50 to 105 ° C., and the resin (B) has an unsaturated carboxylic acid content of 3 to 30% by mass and a neutralization degree of 5 to 40%. , An ionomer of an ethylene-unsaturated carboxylic acid copolymer having a melting point of 50 to 105 ° C., wherein the polyfunctional monomer (C) is a polyfunctional monomer having a plurality of unsaturated double bonds, and the polyfunctional monomer (D) A polyfunctional monomer having a plurality of unsaturated double bonds and a plurality of Sealing material which is a polyfunctional monomer which is a mixture of the silane coupling agent having a Rukokishiru group.   The solar cell sealing material according to claim 1, wherein the organic peroxide component has a one-hour half-life temperature of 80 to 170 ° C.   The solar cell sealing material according to claim 1, wherein the polyfunctional monomer component is arylate, acrylate, or methacrylate.   The solar cell sealing material according to any one of claims 1 to 3, wherein the silane coupling agent is a silane coupling agent having an epoxy group or a silane coupling agent having an unsaturated double bond. .   A solar cell module using the solar cell sealing material according to claim 1.

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