JP2004214641A - Filler sheet for solar cell module, and the solar cell module using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filler sheet for a solar cell module and the solar cell module using the same, whereby the solar cell module can be manufactured with proper characteristics, such as high strength, durability, weather resistance, heat resistance, water resistance, light-fastness, wind durability, resistance to hail, and is superior in suitability of vacuum lamination, and has high heat-sealing properties, without being affected by the manufacturing conditions and so on, and the solar cell module is applicable to various applications with stability at a low cost. <P>SOLUTION: The filler sheet of a solar cell device is composed of a resin film, which is made of a resin composition, including one or more selected from a group which consists of a copolymer or its denaturation and condensate of α-olefin and an ethylene unsaturated silane compound, a light resistance agent, a UV absorber, and a heat stabilizer. Further, the filler sheet is composed of a resin film which is made of a resin composition which includes maleic anhydride-denatured polyolefin. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a filler sheet for a solar cell module and a solar cell module using the same, and more specifically, strength, excellent durability and the like, and weather resistance, heat resistance, light resistance, water resistance, wind pressure resistance, It has excellent properties such as hail resistance, suitability for vacuum lamination, etc., and has extremely excellent heat-sealing properties without being affected by the manufacturing conditions such as thermocompression bonding for manufacturing solar cell modules. The present invention relates to a very useful solar cell module filler sheet capable of manufacturing a solar cell module at a low cost, and a solar cell module using the same.

  2. Description of the Related Art In recent years, attention has been paid to solar cells as a clean energy source due to increasing awareness of environmental issues. Currently, various types of solar cell modules have been developed and proposed.

  In general, the above-mentioned solar cell module, for example, manufactures a crystalline silicon solar cell element or an amorphous silicon solar cell element, and uses such a solar cell element, as a surface protection sheet, a filler sheet, and a photovoltaic element. Are laminated in this order of a solar cell element, a filler sheet, a back surface protective sheet, and the like, and then vacuum-sucked and heated and pressed to form a lamination method.

  Thus, the above-described solar cell module is initially applied to calculators, and thereafter, is applied to various electronic devices and the like, and its application range is rapidly expanding for consumer use. It is said that the most important task in the future is to realize large-scale centralized solar cell power generation.

  By the way, in the above-mentioned solar cell module, as the filler sheet laminated on the front side and the back side of the solar cell element as a photovoltaic element, the one positioned on the front side receives sunlight, It is necessary to have transparency that allows light to pass through, but those that are located on the back surface side are not necessarily required to have transparency.

  In addition, the filler sheet constituting the above-mentioned solar cell module has, of course, an adhesive property with a surface protection sheet or a back surface protection sheet, and further has both front and back surfaces of a solar cell element as a photovoltaic element. It has thermoplasticity to fulfill the function of maintaining smoothness, and furthermore, it is excellent in strength, durability, etc., and also in weather resistance, heat resistance, because it is a protection of a solar cell element as a photovoltaic element. It is said that it is necessary to be excellent in various properties such as light resistance, water resistance, wind pressure resistance, and hail resistance, and also to be excellent in scratch resistance, shock absorption and the like.

  At present, as a material constituting the above-mentioned filler sheet, a filler sheet made of an ethylene-vinyl acetate copolymer having a thickness of 400 μm to 600 μm from the viewpoints of workability, workability, production cost and the like. Is most commonly used (see, for example, Patent Documents 1 and 2).

JP-A-58-63178 (Claims) JP-A-59-22978 (Claims)

  However, a filler sheet made of the above-described ethylene-vinyl acetate copolymer or the like having a thickness of 400 μm to 600 μm is used, and this is laminated with a surface protection sheet, a solar cell element, and a back surface protection sheet, etc. When a solar cell module is manufactured by directly laminating using a lamination method or the like in which vacuum suction is applied to the solar cell module under heat and pressure, the ethylene-vinyl acetate copolymer may be used under the conditions of the heat and pressure bonding or the storage and storage of the manufactured solar cell module. A filler sheet made of a polymer or the like is affected, for example, an ethylene-vinyl acetate copolymer is thermally contracted, or undergoes thermal decomposition or the like to release acetic acid, decomposed gas such as acetic acid gas, decomposed. Generates a substance or the like, which has an adverse effect on the solar cell module, for example, corrodes an electrode constituting the solar cell module, and deteriorates or Causes a problem such as a decrease in power generation or a reaction with an amorphous portion of silicon constituting a solar cell element, causing a problem such as a reduction in electromotive force. However, there is a problem that it is not possible to sufficiently satisfy the storage stability and the like, and it is difficult to manufacture a solar cell module stably at low cost.

  Further, as described above, when the ethylene-vinyl acetate copolymer shrinks by heat or causes thermal decomposition or the like to release acetic acid and generate a decomposition gas such as acetic acid gas, the working environment deteriorates. As a result, the influence on the workers and the like is unavoidable, and the improvement of the manufacturing environment and the like is unavoidable, which not only significantly increases the cost but also significantly impairs the productivity and the like.

  Further, the resin itself such as the above-mentioned ethylene-vinyl acetate copolymer, slightly lacks in strength, durability, etc., and has excellent properties such as weather resistance, heat resistance, light resistance, wind pressure resistance, and hail resistance. However, for example, it is degraded by ultraviolet rays or the like due to sunlight or the like, for example, discoloration such as yellowing is caused, and there is also a problem that the appearance design, decorativeness and the like are significantly impaired. .

  Therefore, the present invention provides a material for a filler sheet, which is not affected by the manufacturing conditions of the solar cell module, and further has excellent strength, durability, etc., and also has weather resistance, heat resistance, water resistance, and light resistance. , Wind resistance, hail resistance, vacuum lamination suitability, etc., and extremely excellent heat fusion without being affected by manufacturing conditions such as thermocompression bonding for manufacturing solar cell modules. An object of the present invention is to provide a very useful filler sheet for a solar cell module and a solar cell module using the same, which can stably produce a solar cell module suitable for various uses at low cost.

  The present inventor has conducted various studies on a filler sheet for a solar cell module to solve the above problems, and as a result, has found that a copolymer of an α-olefin and an ethylenically unsaturated silane compound or a modified or condensed product thereof. And a filler sheet made of a resin film of a resin composition containing one or more light stabilizers, ultraviolet absorbers, or heat stabilizers, and laminated on the front side and the back side of the solar cell element. As the filler sheet to be used, instead of the conventional filler sheet made of ethylene-vinyl acetate copolymer or the like, a copolymer of the above-mentioned α-olefin and an ethylenically unsaturated silane compound or a modified or condensed product thereof, A filler sheet is formed from a resin film of a resin composition containing at least one selected from the group consisting of a light stabilizer, an ultraviolet absorber, and a heat stabilizer, and firstly, surface protection. A sheet, a copolymer of an α-olefin and an ethylenically unsaturated silane compound or a modified or condensed product thereof, and one or more selected from the group consisting of a light stabilizer, an ultraviolet absorber, and a heat stabilizer. Filler sheet consisting of a resin film of a resin composition containing, a solar cell element, a copolymer of an α-olefin and an ethylenically unsaturated silane compound or a modified or condensed product thereof, a light stabilizer, an ultraviolet absorber, and heat A filler sheet made of a resin film of a resin composition containing one or more kinds selected from the group consisting of stabilizers, and a back surface protection sheet are sequentially laminated, and then these are integrally vacuum suctioned. When a solar cell module was manufactured using a lamination method or the like in which heat and pressure were applied, a copolymer of the above α-olefin and an ethylenically unsaturated silane compound was obtained. Is a filler sheet made of a resin film of a resin composition containing a modified or condensed product thereof, and one or more selected from the group consisting of a light stabilizer, an ultraviolet absorber, and a heat stabilizer. Excellent durability, etc., and excellent properties such as weather resistance, heat resistance, water resistance, light resistance, wind pressure resistance, hail resistance, suitability for vacuum lamination, etc.Furthermore, manufacturing such as thermocompression bonding for manufacturing solar cell modules Completed the present invention by finding that extremely useful solar cell modules suitable for various applications can be manufactured stably, at low cost, having extremely excellent heat-fusing properties without being affected by conditions. It was done.

  Further, by using a filler sheet made of a resin film of a resin composition containing a maleic anhydride-modified polyolefin as a filler sheet to be laminated on the front side and the back side of the solar cell element, α-olefin and ethylenically unsaturated A resin film of a resin composition containing a copolymer with a silane compound or a modified or condensed product thereof, and one or more members selected from the group consisting of a light stabilizer, an ultraviolet absorber, and a heat stabilizer is used. In addition to obtaining the same effect as in the case of the above, the present invention was found to be excellent in adhesion stability to the surface protection sheet and the back surface protection sheet, and completed the present invention.

  That is, the present invention provides, as a filler sheet laminated on the front side and the back side of the solar cell element, a copolymer of an α-olefin and an ethylenically unsaturated silane compound or a modified or condensed product thereof, a light stabilizer, and an ultraviolet ray. A filler sheet for a solar cell module, comprising a filler sheet made of a resin film of a resin composition containing at least one selected from the group consisting of an absorbent and a heat stabilizer, and a filler sheet for the solar cell module. The present invention relates to a solar cell module using the same.

  Further, the present invention provides a solar cell, wherein a filler sheet is formed from a resin film of a resin composition containing a maleic anhydride-modified polyolefin as a filler sheet laminated on the front side and the back side of the solar cell element. The present invention relates to a filler sheet for use and a solar cell module using the same.

  One or two members selected from the group consisting of a copolymer of an α-olefin and an ethylenically unsaturated silane compound according to the present invention or a modified or condensed product thereof, and a light stabilizer, an ultraviolet absorber, and a heat stabilizer. The filler sheet made of a resin film of the resin composition containing the above is excellent in strength, durability, etc., and also has weather resistance, heat resistance, water resistance, light resistance, wind pressure resistance, hail resistance, vacuum lamination suitability, etc. And has extremely excellent heat-sealing properties without being affected by manufacturing conditions such as thermocompression bonding for manufacturing a solar cell module. By using this filler sheet, an extremely useful solar cell module suitable for various uses can be stably manufactured at low cost.

  Further, the filler sheet made of a resin film of the resin composition containing the maleic anhydride-modified polyolefin according to the present invention is excellent in the above-described various properties, and further, by using this filler sheet, is further surface-treated. Excellent adhesion stability can be achieved even for surface protection sheets and backside protection sheets.

The present invention will be described in more detail below.
In the present invention, the term “sheet” means any of a sheet or a film, and the term “film” means any of a film or a sheet. is there.

[1] Filler Sheet First, in the present invention, a filler sheet laminated on both the front surface side and the back surface side of a solar cell element as a photovoltaic element will be described. As described above, the filler sheet to be laminated on the surface side of the solar cell element needs to have transparency to allow sunlight to enter and pass through it, and has adhesiveness to the surface protection sheet. That, further, to have a thermoplastic property to fulfill the function of maintaining the smoothness of the surface of the solar cell element as a photovoltaic element, further from the protection of the solar cell element as a photovoltaic element, Excellent in strength, durability, etc., and also excellent in various properties such as weather resistance, heat resistance, light resistance, water resistance, wind pressure resistance, hail resistance, suitability for vacuum lamination, and thermocompression bonding for manufacturing solar cell modules It is required to have an extremely excellent heat-sealing property without being affected by the manufacturing conditions, and to have excellent scratch resistance, shock absorption and the like.

  On the other hand, as the filler sheet laminated on the back surface side of the solar cell element, like the filler sheet laminated on the front side of the solar cell element, it is necessary to have adhesiveness to the back surface protection sheet, Furthermore, it has thermoplasticity in order to fulfill the function of having the smoothness of the back surface of the solar cell element as a photovoltaic element. Excellent, and also excellent in various properties such as weather resistance, heat resistance, light resistance, water resistance, wind pressure resistance, hail resistance, suitability for vacuum lamination, etc., extremely durable, and also scratch resistance, shock absorption etc. It is necessary to be excellent.

  However, unlike the filler sheet laminated on the front side of the solar cell element, the filler sheet laminated on the back side of the solar cell element is not necessarily required to have transparency.

  Thus, in the present invention, as a filler sheet having the above-described performance, function, characteristics, and the like, a copolymer of an α-olefin and an ethylenically unsaturated silane compound or a modified or condensed product thereof, Sheet (hereinafter sometimes referred to as “filler sheet (A)”) composed of a resin film made of a resin composition containing one or more kinds of agents, ultraviolet absorbers, or heat stabilizers. Is what you do.

  Furthermore, in the present invention, as a filler sheet having the above-described performance, function, characteristics, and the like, a filler sheet (hereinafter, referred to as a filler sheet (B)) may be formed from a resin film of a resin composition containing a maleic anhydride-modified polyolefin. ).)).

  In the present invention, a filler sheet is formed using substantially the same material on both the front side and the back side of the solar cell element.

  Hereinafter, the filler sheet (A) and the filler sheet (B) will be described in detail.

1. Filler sheet (A)
The filler sheet (A) is composed of a copolymer of an α-olefin and an ethylenically unsaturated silane compound or a modified or condensed product thereof, and one or more kinds of light stabilizers, ultraviolet absorbers, or heat stabilizers. And a resin film of a resin composition containing: Hereinafter, each component of the resin composition and a method for producing the resin composition will be described.

(1) A copolymer of an α-olefin and an ethylenically unsaturated silane compound or a modified or condensed product thereof First, a filler sheet (A) to be laminated on both the front side and the back side of the solar cell element in the present invention is prepared. The copolymer of the constituent α-olefin and the ethylenically unsaturated silane compound or a modified or condensed product thereof will be described. Examples of such a copolymer of an α-olefin and an ethylenically unsaturated silane compound or a modified or condensed product thereof include one or two or more α-olefins and one or more ethylenically unsaturated silane compounds. Or more and, if necessary, one or more other unsaturated monomers in a desired reaction vessel at a pressure of 500 to 4000 kg / cm ² , preferably 1000 to 4000 kg / cm ² . cm ² , at a temperature of 100 to 400 ° C., preferably 150 to 350 ° C., in the presence of a radical polymerization initiator and, if necessary, a chain transfer agent, at the same time or in a stepwise random copolymerization manner. The silane compound constituting the random copolymer formed by the copolymerization is modified or condensed to form an α-olefin and an ethylenically unsaturated silane. Examples thereof include copolymers with a run compound or modified or condensed products thereof.

  In the present invention, as the copolymer of an α-olefin and an ethylenically unsaturated silane compound or a modified or condensed product thereof, for example, one or two or more α-olefins and, if necessary, other One or two or more unsaturated monomers are polymerized simultaneously or stepwise in a desired reaction vessel in the same manner as described above in the presence of a radical polymerization initiator and, if necessary, a chain transfer agent. Then, an ethylenically unsaturated silane compound, or one or more of its initial condensate or condensate is graft-copolymerized to a polyolefin polymer produced by the polymerization, and further, the copolymer By modifying or condensing a portion of the silane compound constituting the resulting graft copolymer, copolymerization of the α-olefin with the ethylenically unsaturated silane compound It may be mentioned those produced body or a modified or condensate.

  In the copolymer or modified or condensed product of the α-olefin and the ethylenically unsaturated silane compound produced above, as the polymer portion composed of the α-olefin, transparency, processability, adhesion, cost, etc. From the viewpoint, it is preferable to use a low-density polyethylene, a linear low-density polyethylene, a copolymer of ethylene and an α-olefin polymerized using a single-site catalyst, or the like.

  In the copolymer or modified or condensed product of the α-olefin and the ethylenically unsaturated silane compound produced above, the Si atom constituting the silane compound has, for example, an alkyl group such as methyl and ethyl. , A methoxy group, an ethoxy group and other alkoxy groups, a hydroxyl group, a halogen atom and the like may be arbitrarily bonded.

  In the above, examples of the α-olefin include ethylene, propylene, 1-butene, isobutylene, 1-pentene, 2-methyl-1-butene, 3-methyl-1-butene, 1-hexene, 1-heptene, One or more of octene, 1-nonene, and 1-decene can be used.

  In the above, examples of the ethylenically unsaturated silane compound include, for example, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltripropoxysilane, vinyltriisopropoxysilane, vinyltributoxysilane, vinyltripentyloxysilane, and vinyltripentylsilane. Use one or more of phenoxysilane, vinyltribenzyloxysilane, vinyltrimethylenedioxysilane, vinyltriethylenedioxysilane, vinylpropionyloxysilane, vinyltriacetoxysilane, or vinyltricarboxysilane Can be.

  Further, in the above, other unsaturated monomers include, for example, vinyl acetate, acrylic acid, methacrylic acid, itaconic acid, fumaric acid, maleic acid, methyl acrylate, methyl methacrylate, ethyl acrylate, styrene, acrylonitrile, methacrylonitrile Alternatively, one or more vinyl alcohols can be used.

  In the above, when the copolymer is modified or condensed, other silane compounds or the like can be used.

  Further, in the above, examples of the radical polymerization initiator include, for example, lauroyl peroxide, dipropionyl peroxide, benzoyl peroxide, di-t-butyl peroxide, t-butyl hydroperoxide, t-butyl peroxyisobutyrate , P-menthane hydroperoxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane-3, t-butylperoxybenzoate, dicumyl peroxide, 2,5-dimethyl-2, Organic peroxides such as 5-di (t-butylperoxyhexane), molecular oxygen, and azo compounds such as azobisisobutyronitrile azoisobutyl valeronitrile can be used.

  In the above description, examples of the chain transfer agent include paraffinic hydrocarbons such as methane, ethane, propane, butane, and pentane; α-olefins such as propylene, butene-1, and hexene-1; formaldehyde; acetaldehyde; Aldehydes such as butyraldehyde, ketones such as acetone, methyl ethyl ketone and cyclohexanone, aromatic hydrocarbons, chlorinated hydrocarbons and the like can be used.

  Furthermore, in the above, the method of modifying or condensing the portion of the silane compound constituting the random copolymer, or the method of modifying or condensing the portion of the silane compound constituting the graft copolymer, for example, tin, Using carboxylic acid salts of metals such as zinc, iron, lead, and cobalt, organometallic compounds such as titanates and chelates, organic bases, inorganic acids, and silanol condensation catalysts such as organic acids, α-olefins And the ethylenically unsaturated silane compound by performing a dehydration condensation reaction between the silanol of the portion of the silane compound constituting the random copolymer or the graft copolymer of the ethylenically unsaturated silane compound and the ethylenically unsaturated silane compound. A modified or condensed product of the copolymer can be produced.

  In the present invention, the content of the ethylenically unsaturated silane compound constituting the copolymer of the α-olefin and the ethylenically unsaturated silane compound is, for example, 0.001 to 30% by weight, preferably 0.1 to 30% by weight. 01 to 10% by weight, particularly preferably 0.01 to 5% by weight, is desirable.

  In the present invention, when the content of the ethylenically unsaturated silane compound constituting the copolymer of the α-olefin and the ethylenically unsaturated silane compound is large, the composition is excellent in mechanical strength, heat resistance, and the like. On the other hand, if the content is excessive, the tensile elongation may be inferior, and the free ethylenically unsaturated silane compound may inhibit the adhesion, and may tend to be inferior in heat sealability. When the content is small, the adhesion to other members may be poor.

  In the present invention, the material constituting the filler sheet (A) to be laminated on the front side and the back side of the solar cell element is an ethylene-based material in order to exhibit effects such as strength, heat resistance, and heat fusion property. As the content of the unsaturated silane compound, the above content is the most preferable.

(2) Light Resistant, Ultraviolet Absorber, or Heat Stabilizer Next, in the present invention, the lightproof agent and the ultraviolet light absorber constituting the filler sheet (A) laminated on both the front surface side and the rear surface side of the solar cell element The agent or the heat stabilizer will be described. In the present invention, by adding one or more of the above-mentioned light stabilizers, ultraviolet absorbers, or heat stabilizers, stable mechanical strength, adhesive strength, yellowing prevention, cracking prevention over a long period of time, A filler sheet having characteristics such as excellent workability can be produced.

(Lightfast agent)
First, as the light-resistant agent, those that do not hinder the performance as a filler sheet such as sealability and total light transmittance, and that prevent deterioration of the performance of the filler sheet due to light can be used. For example, hindered amine light stabilizers can be used.

  Specifically, for example, N, N'N "N '"-tetrakis- (4,6-bis- (butyl- (N-methyl-2,2,6,6-tetramethylpiperidine-4- Yl) amino) -triazin-2-yl) -4,7-diazadecane-1,10-diamine, dibutylamine- (1,3,5-triazine) -N, N′-bis (2,2,6, 6-tetramethyl-4-piperidyl-1,6-hexamethylenediamine) -N- (2,2,6,6-tetramethyl-4-piperidyl) butylamine (condensation product), poly [{6- (1 , 1,3,3-tetramethylbutyl) amino-1,3,5-triazine-2,4-diyl {(2,2,6,6-tetramethyl-4-piperidyl) imino {hexamethylene} ( 2,2,6,6-tetramethyl-4-piperidyl) imino}], koha Dimethyl citrate and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol polymer, bis (2,2,6,6-tetramethyl-1 (octyloxy) -4-decanoate) Piperidinyl) ester, a reaction product of 1,1-dimethylethyl hydroperoxide and octane, bis (1,2,2,6,6-pentamethyl-4-piperidyl) [[3,5-bis (1,1-dimethyl Ethyl) -4-hydroxyphenyl] methyl] butylmalonate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and methyl 1,2,2,6,6-pentamethyl-4-piperidyl A mixture of sebacate, bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate and the like can be used.

If necessary, a plurality of these may be used in combination.
The amount of addition varies depending on the light stabilizer, but is 0.01 to 5% by weight, preferably 0.01 to 3% by weight, based on the copolymer of the α-olefin and the ethylenically unsaturated silane compound or the modified or condensed product thereof. % By weight, more preferably 0.01 to 1% by weight.

  In the above, if the amount is less than the above range, the effect as a light-proofing agent is insufficient, and if it is more than the above range, it may bleed out to the sheet surface and inhibit adhesion. Further, it is not preferable because the cost is increased.

(UV absorber)
Next, as the above ultraviolet absorber, for example, in addition to organic compounds such as benzophenone-based, benzoate-based, triazole-based, triazine-based, salicylic acid derivative-based, and acrylonitrile derivative-based, inorganic compounds such as titanium oxide and zinc oxide Fine particles and the like can also be used.

  Specifically, for example, octabenzone, 2-hydroxy-4-n-octoxy-benzophenone or the like as a benzophenone type, and 2,4-di-tert-butylphenyl-3,5-di-tert as a benzoate type. Examples of triazoles such as -butyl-4-hydroxybenzoate include 2- [5-chloro (2H) -benzotriazol-2-yl] -4-methyl-6- (tert-butyl) phenol and 2,4-diphenyl. Triazines such as -tert-butyl-6- (5-chlorobenzotriazol-2-yl) phenol include 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5- [(Hexyl) oxy] -phenol and the like can be used.

If necessary, a plurality of these may be used in combination.
The amount of addition varies depending on the type of the ultraviolet absorber, but it is 0.01 to 5% by weight, preferably 0 to 5% by weight, based on the copolymer of the α-olefin and the ethylenically unsaturated silane compound or the modified or condensed product thereof. 0.01 to 1% by weight, more preferably 0.01 to 1% by weight.

  If the amount is less than the above range, the effect as an ultraviolet absorber is insufficient, and if it is more than the above range, bleeding out to the sheet surface may hinder the adhesion. Further, it is not preferable because the cost is increased.

(Heat stabilizer)
Furthermore, the above-mentioned heat stabilizer is used for heat resistance during processing, and for example, a phosphorus-based heat stabilizer, a phenol-based heat stabilizer, or a lactone-based heat stabilizer can be used.

  Specifically, for example, as a phosphorus-based heat stabilizer, tris (2,4-di-tert-butylphenyl) phosphite, bis [2,4-bis (1,1-dimethylethyl) -6-methyl Phenyl] ethyl ester phosphorous acid, tetrakis (2,4-di-tert-butylphenyl) [1,1-biphenyl] -4,4′-diylbisphosphonite, bis (2,4-di-tert-butyl) As a lactone-based heat stabilizer such as butylphenyl) pentaerythritol diphosphite, a reaction product of 3-hydroxy-5,7-di-tert-butyl-furan-2-one and o-xylene is used. Can be.

If necessary, a plurality of these may be used in combination.
The amount of addition varies depending on the type of the heat stabilizer, but it is 0.01 to 5% by weight, preferably 0 to 5% by weight, based on the copolymer of the α-olefin and the ethylenically unsaturated silane compound or a modified or condensed product thereof. 0.01 to 1% by weight, more preferably 0.01 to 1% by weight.

  When the amount is less than the above range, the effect as a heat stabilizer is insufficient, and when the amount is more than the above range, bleeding out to the sheet surface may hinder the adhesion. Further, it is not preferable because the cost is increased.

(3) Method for Producing Resin Composition Next, in the present invention, a copolymer of an α-olefin and an ethylenically unsaturated silane compound or a modified or condensed product thereof, and a light stabilizer, an ultraviolet absorber, or a heat stabilizer A method for producing a resin composition containing one or more agents will be described. Such a resin composition of the present invention is provided with one or two or more of the above-mentioned copolymer of an α-olefin and an ethylenically unsaturated silane compound or a modified or condensed product thereof, as described above. Agents, ultraviolet absorbers, or one or more heat stabilizers, and, if necessary, optionally other components other than the above components, as long as the effects of the present invention are not impaired. Specifically, for example, various additives commonly used, for example, antioxidants, nucleating agents, neutralizing agents, lubricants, antiblocking agents, antistatic agents, dispersants, flow improvers, release agents , A flame retardant, a colorant, a filler, etc. are optionally added, and if necessary, a solvent, a diluent, etc. are added, and the mixture is uniformly mixed with, for example, a Henschel mixer, a ribbon blender, a V-type blender, and the like. Or multi-screw extruder, roll, van Mixer, kneader, and melt-kneaded by a Brabender or the like, can be prepared as a resin composition comprising a pelletized or properties of the powder and the like. The content of the copolymer of the α-olefin and the ethylenically unsaturated silane compound or the modified or condensed product thereof in the resin composition is preferably 0.01% by weight or more, more preferably 1% by weight or more. % By weight or more, more preferably 3% by weight or more.

  In the present invention, the resin composition described above can be further prepared by adding another resin within a range that does not impair the present invention.

  As the above resin, for example, an ethylene-α-olefin copolymer polymerized using a metallocene catalyst may be used, but a resin having a narrow molecular weight distribution of a polymer serving as a main polymer as described above has poor moldability. Since it is somewhat inferior, it is also possible to use low-density polyethylene or polypropylene having different densities and to add the same to improve the moldability.

2. Filler sheet (B)
Next, the filler sheet (B) will be described.
The filler sheet (B) comprises a resin film made of a resin composition containing a maleic anhydride-modified polyolefin and one or more light stabilizers, ultraviolet absorbers, or heat stabilizers. Hereinafter, each component of the resin composition and a method for producing the resin composition will be described.

(1) Maleic anhydride-modified polyolefin The maleic anhydride-modified polyolefin constituting the filler sheet (B) laminated on both the front surface side and the back surface side of the solar cell element used in the present invention is α-olefin and, if necessary, It is a polymer obtained by polymerizing a polyolefin polymer obtained by polymerizing other unsaturated monomers used in the present invention with maleic anhydride, and then modified by graft copolymerization. By using such a maleic anhydride-modified polyolefin, the filler sheet (B) is rich in reactivity with the polar group present on the surface of the surface-treated surface protection sheet or the backside protection sheet. This is useful in that the adhesion stability with the resin can be ensured. In addition, since the maleic anhydride-modified polyolefin does not produce a low-molecular-weight compound in the adhesive formation process, it does not deteriorate the working environment and is advantageous in cost.

  In the filler sheet (B) of the present invention, the maleic anhydride-modified polyolefin may be used alone or in combination of two or more.

Such a maleic anhydride-modified polyolefin is prepared by using one or more kinds of α-olefins and, if necessary, one or more kinds of other unsaturated monomers in a desired reaction vessel. usually 500~4000kg / cm ² pressure, preferably 1000~4000kg / cm ^2, temperature of usually 100 to 400 ° C., under the conditions of preferably 150 to 350 ° C., a radical polymerization initiator and if needed a chain transfer agent The polymerization is carried out simultaneously or stepwise in the presence of, followed by graft copolymerization of maleic anhydride with a polyolefin polymer produced by the polymerization.

  As the α-olefin used in the present invention, for example, ethylene, propylene, 1-butene, isobutylene, 1-pentene, 2-methyl-1-butene, 3-methyl-1-butene, 1-hexene, 1-heptene , 4-methylpentene-1, 1-octene, 1-nonene, 1-decene, and the like.

  Further, as the polymer portion comprising one or more of these α-olefins, low-density polyethylene, medium-density polyethylene, high-density polyethylene, Preferable examples include low-density polyethylene, linear low-density polyethylene, polypropylene, and a copolymer of ethylene and an α-olefin polymerized using a single-site catalyst.

  Among these, linear low-density polyethylene is particularly preferable because it has a narrow molecular weight distribution and does not by-produce a low-molecular-weight compound caused by a low-molecular-weight polymer in the process of forming an adhesive.

  As the other unsaturated monomers, radical polymerization initiators, and chain transfer agents used as needed for the polyolefin-based polymer, the same ones as described for the filler sheet (A) may be used. it can.

  The maleic anhydride-modified polyolefin used in the present invention is a polyolefin-based polymer as described above, which is modified by graft copolymerization of maleic anhydride. In the present invention, the maleic anhydride content in the maleic anhydride-modified polyolefin is preferably in the range of 0.001% to 30% by weight, more preferably 0.01% to 10% by weight, More preferably, the content is 0.01% by weight to 5% by weight.

  When the content of maleic anhydride is large, it is difficult to obtain the adhesion of a fluorine-based resin sheet subjected to atmospheric pressure plasma treatment as a surface protection sheet or a color steel sheet coated with a polyester-based paint as a backside protection sheet. Even when a material is used, it can be firmly bonded to a functional group on the surface thereof, which is preferable in that adhesion stability can be ensured. However, when the content of the maleic anhydride is excessive, the generation of unreacted products and by-products cannot be controlled, and the adhesive performance decreases.

  In the present invention, the weight average molecular weight of such a maleic anhydride-modified polyolefin determined by gel permeation chromatography is preferably in the range of 1,000 to 1300,000, more preferably 10,000 to 500,000. 000, more preferably 50,000 to 100,000. If it is lower than this range, the formation of unreacted products and by-products cannot be controlled, and the adhesive performance is reduced. Conversely, if it is higher than this range, the transparency will deteriorate.

  Further, the ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) is preferably 6 or less, more preferably 5 or less, and still more preferably 4 or less. Within this range, the dispersion of the molecular weight distribution is narrow, so that the generation of by-products due to the low molecular weight polymer is suppressed.

  In the present invention, the number average molecular weight (Mn) is determined from the molecular weight distribution chart obtained by separation based on the difference in molecular size by gel permeation chromatography.

(2) Light Resistant, UV Absorber, or Heat Stabilizer In addition to the maleic anhydride-modified polyolefin, the resin film constituting the filler sheet (B) of the present invention further comprises a light stabilizer, an ultraviolet absorber, Alternatively, it is preferably obtained using a resin composition containing one or more heat stabilizers. As the light stabilizer, the ultraviolet absorber, or the heat stabilizer used for such a filler sheet (B), the same ones as described for the filler sheet (A) can be used, and the same amount is used. It is preferable that it is within the range.

(3) Method for Producing Resin Composition Next, a method for producing a resin composition containing a maleic anhydride-modified polyolefin and one or more light stabilizers, ultraviolet absorbers, or heat stabilizers will be described. . Such a resin composition of the present invention comprises one or more of the above-mentioned maleic anhydride-modified polyolefins and one or more of the above-mentioned light stabilizers, ultraviolet absorbers, or heat stabilizers. Seeds are added, and further, if necessary, components other than the above components are arbitrarily added to the extent that the effects of the present invention are not impaired.Specifically, for example, various commonly used additives, for example, Optionally adding antioxidants, nucleating agents, neutralizing agents, lubricants, antiblocking agents, antistatic agents, dispersants, flow improvers, mold release agents, flame retardants, colorants, fillers, etc. Further, if necessary, a solvent, a diluent, etc. are added and, for example, after uniformly mixed with a Henschel mixer, a ribbon blender, a V-type blender, etc., a single or multi-screw extruder, a roll, a Banbury mixer, a kneader, a Brabender, etc. Melting by And kneading, may be prepared as a resin composition comprising a pelletized or properties of the powder and the like. The content of the maleic anhydride-modified polyolefin in the resin composition is preferably 0.01% by weight or more, more preferably 1% by weight or more, and further preferably 3% by weight or more.

  In the present invention, the resin composition described above can be further prepared by adding another resin within a range that does not impair the present invention. As the other resin, it is preferable to use low-density polyethylene, polypropylene, or the like having different densities in order to improve moldability for the same reason as described for the filler sheet (A).

3. Method for Producing Filler Sheet Next, in the present invention, a copolymer of an α-olefin and an ethylenically unsaturated silane compound or a modified or condensed product thereof, and one of a light stabilizer, an ultraviolet absorber, and a heat stabilizer A resin composition containing at least one or two or more of maleic anhydride-modified polyolefin, and a light-resistant agent, an ultraviolet absorber, or a resin composition containing one or more of heat stabilizers; A method for forming a filler sheet made of a resin film by this will be described. As such a method, for example, using the resin composition according to the present invention prepared above, a molding method usually used in ordinary thermoplastic resin, namely, injection molding, extrusion molding, hollow molding, compression molding, Examples of the method include forming a film or sheet from the resin composition according to the present invention by various molding methods such as rotational molding, and manufacturing a filler sheet using the film or sheet as a resin film.

  Further, in the present invention, the above-mentioned resin composition is used in the form of a masterbatch, and when mixed and molded, it is preferable because of excellent dispersibility and moldability. is there.

  Thus, in the present invention, a film or sheet made of the resin composition according to the present invention is used, and this is used as a surface protective sheet, the film or sheet as a filler layer, and a photovoltaic element. The solar cell element, the above-mentioned film or sheet as a filler layer, and the backside protective sheet are sequentially laminated, and then, these are integrated by vacuum suction or the like, and are subjected to a normal molding method such as a lamination method of heating and pressing. The solar cell module can be manufactured by utilizing each of the above-mentioned layers as an integrally molded body and performing thermocompression molding.

  Alternatively, in the present invention, the resin composition according to the present invention is used, and a molding method usually used for a normal thermoplastic resin, that is, various molding methods such as T-die extrusion molding are used for the present invention. Using such a resin composition, this is melt-extruded and laminated on the front surface and the back surface of the solar cell element, and the extruded resin layer of the resin composition according to the present invention is formed on the front surface and the back surface of the solar cell element. The extruded resin layer can be formed to form a filler sheet using the resin film as a resin film.

  That is, in the present invention, the resin composition according to the present invention is used, and is melt-extruded and laminated on the front and back surfaces of the solar cell element to form an extruded resin layer. A solar cell element having an extruded resin layer as an agent layer on the front and back surfaces thereof, and a back surface protection sheet are sequentially laminated, and then, these are integrated by vacuum suction or the like, and are usually bonded by heat and pressure. The solar cell module can be manufactured by utilizing a molding method and performing heat compression molding of each of the above-described layers as an integrally molded body.

  Furthermore, in the present invention, the above-mentioned resin composition according to the present invention is used, and the above-mentioned resin composition according to the present invention is formed by various molding methods usually used for ordinary thermoplastic resins, ie, T-die extrusion molding. , Which are melt-extruded and laminated on the surface of the surface protection sheet and the backside protection sheet, and the extruded resin layer of the resin composition according to the present invention is coated with the surface protection sheet and the backside protection sheet. And a filler sheet can be formed using the extruded resin layer as a resin film.

  That is, in the present invention, the resin composition according to the present invention is used, and this is melt-extruded and laminated on each surface of the surface protection sheet and the back surface protection sheet to form an extruded resin layer, A surface protective sheet, an extruded resin layer as a filler sheet laminated on the surface thereof, a solar cell element, an extruded resin layer as a filler sheet laminated on the surface of the back protective sheet, and a back protective sheet are sequentially laminated, Next, using a normal molding method such as a lamination method in which these are integrated by vacuum suction or the like and heat-compressed, the above-described layers are heat-pressed and formed as an integrally formed body to produce a solar cell module. .

  In the present invention, for example, a p-layer, an i-layer, an n-layer and the like constituting an amorphous silicon solar cell element are formed on the surface of a glass substrate or the like as a surface protection sheet. Using a resin composition, this is melt-extruded and laminated on the surface of the amorphous silicon solar cell element formed above to form an extruded resin layer as a filler sheet, and further, on the surface of the extruded resin layer, a back surface Laminating the protective sheet, and then, using a normal molding method such as lamination method in which these are integrated by vacuum suction or the like and heat-pressed, the above-mentioned layers are heat-pressed and formed as an integrally formed body, and the solar cell module is formed. Can be manufactured.

  In the present invention, the filler sheet made of the resin film of the resin composition according to the present invention has a thickness of 100 μm to 1 mm, preferably 300 μm to 600 mm.

  Thus, the filler sheet made of the resin film of the resin composition according to the present invention exhibits heat-fusibility and the like due to the heat and pressure applied at the time of molding the solar cell module. The above-mentioned film or sheet as a material sheet, the solar cell element as a photovoltaic element, the above-mentioned film or sheet as a filler sheet, and the backside protective sheet are sequentially laminated and heat-sealed to be extremely durable. This makes it possible to manufacture a solar cell module having excellent performance.

  In addition, the filler sheet made of the resin film of the resin composition according to the present invention is affected by heat or the like itself, and its structure or the like is destroyed, or a phenomenon such as decomposition is caused. It is not recognized, therefore, generation of decomposed gas, impurities, etc. due to its destruction, decomposition, etc. is not recognized, which does not cause adverse effects on the solar cell element, etc., and has extremely excellent durability The module can be manufactured.

  Further, the filler sheet comprising a resin film of the resin composition according to the present invention is excellent in strength, durability, and the like, and has weather resistance, heat resistance, light resistance, water resistance, wind pressure resistance, hail resistance, and the like. It is excellent in various characteristics, and is excellent in scratch resistance, impact absorption and the like, so that a solar cell module with extremely excellent durability can be manufactured.

  The gel fraction of the filler sheet for a solar cell module of the present invention is preferably 10% or less, and particularly preferably 0%. If the gel fraction exceeds this range, the processability during the production of the solar cell module may be reduced, or the adhesion to the surface protection sheet or the back surface protection sheet may be insufficient. In addition, the gel fraction of the filler sheet is, for example, a surface protection sheet, a filler sheet, a solar cell element, a filler sheet, and a back surface protection sheet are laminated in this order, and then these are integrated, and vacuum suction is performed. Refers to the gel fraction of the release layer when a solar cell module is manufactured by using a normal molding method such as a lamination method in which each layer is integrally molded using a lamination method such as lamination.

[2] Solar Cell Module Next, in the present invention, a solar cell module according to the present invention manufactured using a filler sheet formed of a resin film of the resin composition according to the present invention will be described.
First, a layer configuration of a solar cell module according to the present invention manufactured using a filler sheet made of a resin film of the resin composition according to the present invention will be described with reference to drawings and the like. FIG. 1 is a schematic cross-sectional view showing an example of the layer configuration of the solar cell module according to the present invention.

  As shown in FIG. 1, the solar cell module 10 according to the present invention includes a surface protection sheet 1, a filler sheet 2, a solar cell element 3 as a photovoltaic element, a filler sheet 4, and a back surface protection sheet 5. The basic structure is such that the above-described layers are formed into an integrated molded body by using a normal molding method such as a lamination method in which the layers are sequentially laminated and then vacuum-suctioned and heated and pressed.

  The above illustration shows one example of the solar cell module according to the present invention, and the present invention is not limited thereto.

  For example, although not shown, in the above-described solar cell module, for the purpose of absorbing sunlight, reinforcing, and the like, the solar cell module is further laminated and integrated with another base material or the like as desired. Can be manufactured. Hereinafter, each layer of the solar cell module according to the present invention will be described in detail.

1. Surface protective sheet In the above, as the surface protective sheet constituting the solar cell module according to the present invention, has a solar permeability, electrical insulation and the like, and excellent mechanical or chemical or physical strength, Specifically, it is excellent in various fastnesses such as weather resistance, heat resistance, water resistance, light resistance, wind pressure resistance, hail resistance, chemical resistance, etc.In particular, it has excellent light resistance and penetration of moisture, oxygen, etc. Characteristics such as excellent moisture proofness to prevent blemishes, high surface hardness, and excellent antifouling properties to prevent accumulation of dirt and dust on the surface, extremely durable, and high protection ability. It is desirable to have

  In the present invention, as the surface protection sheet as described above, specifically, for example, not only a glass plate and the like, but also a polyethylene resin, a polypropylene resin, a cyclic polyolefin resin, a fluorine resin, a polystyrene resin, Acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), polyvinyl chloride resin, poly (meth) acrylic resin, polycarbonate resin, polyethylene terephthalate, polyethylene naphthalate, etc. Polyester resins, polyamide resins such as various nylons, polyimide resins, polyamide imide resins, polyaryl phthalate resins, silicone resins, polysulfone resins, polyphenylene sulfide resins, polyether sulfone resins, Urethane resin, acetal resin, a film or sheet of various resins such as cellulose resins can be used.

  In the present invention, among the resin films or sheets described above, in particular, a film or sheet of a fluorine resin, a cyclic polyolefin resin, a polycarbonate resin, a poly (meth) acrylic resin, or a polyester resin is used. Is preferable.

  Thus, in the present invention, the film or sheet of the above-mentioned fluorine-based resin, cyclic polyolefin-based resin, polycarbonate-based resin, poly (meth) acrylic resin, or polyester-based resin has mechanical properties and chemical properties. , Physical properties, etc., specifically, excellent in various robustness such as weather resistance, heat resistance, water resistance, light resistance, moisture resistance, stain resistance, chemical resistance, etc., and its flexibility and It has advantages such as light weight due to mechanical properties, chemical properties, etc., excellent workability, etc., and easy handling.

  In particular, in the present invention, among the various resin films or sheets as described above, a polyvinyl fluoride resin (PVF) or a fluorine resin composed of a copolymer of tetrafluoroethylene and ethylene or propylene (ETFE) is used. It is preferable to use a resin sheet or a cyclic polyolefin-based resin sheet made of a polymer or copolymer of a cyclic diene such as cyclopentadiene and its derivative, dicyclopentadiene and its derivative, or norbornadiene and its derivative. .

  Thus, in the present invention, by using the above-mentioned fluorine-based resin sheet or cyclic polyolefin-based resin sheet, they have excellent mechanical properties, chemical properties, physical properties, etc. Is a surface protection sheet that constitutes a solar cell module by utilizing various properties such as weather resistance, heat resistance, water resistance, light resistance, moisture resistance, stain resistance, and chemical resistance. Therefore, it has durability, protection functionality, etc., and has advantages such as its flexibility, mechanical properties, chemical properties, etc., lightness, excellent workability, etc., and easy handling. .

  As the surface protective sheet used in the present invention, it is preferable that a surface treatment layer is provided on a film or sheet of the above-mentioned various resins in order to improve the adhesion to the filler sheet.

  Such a surface treatment layer may optionally include, for example, a pretreatment such as a corona discharge treatment, an ozone treatment, a low-temperature plasma treatment using an oxygen gas or a nitrogen gas, a glow discharge treatment, and an oxidation treatment using a chemical. For example, a corona treatment layer, an ozone treatment layer, a plasma treatment layer, an oxidation treatment layer, or the like can be formed and provided. Among them, a plasma treatment layer is particularly preferable because a treatment gas can be arbitrarily selected under atmospheric pressure and a polymer surface can be freely constructed.

  In particular, as the surface protective sheet of the present invention, it is preferable to use a surface protective sheet provided with the above-mentioned surface treatment layer, particularly a plasma treatment layer, using the above-mentioned fluorine-based resin sheet as a base material. Such a surface protection sheet is excellent in transparency, good in weather resistance, large in mechanical strength, excellent in chemical resistance, and excellent in heat resistance because it is stable in a wide temperature range. This is because required properties such as water resistance, light resistance, moisture resistance and stain resistance can be satisfied.

  When a surface treatment layer is provided on the surface protection sheet, it is preferable to use the filler sheet (B) of the present invention as the filler sheet. This is because the maleic anhydride-modified polyolefin, which is a constituent material of the filler sheet (B), reacts with a polar group present in the surface treatment layer, and adhesion stability at the interface between the surface protective sheet and the filler sheet is ensured. is there.

  In the present invention, as the film or sheet of the above-mentioned various resins, for example, one or more kinds of the above-mentioned various resins are used, and an extrusion method, a cast molding method, a T-die method, a cutting method, an inflation method and the like are used. A method of forming the above-mentioned various resins alone by using the above-mentioned film-forming method, a method of forming a multilayer co-extrusion film using two or more kinds of various resins, and a method of further forming two kinds of resins. Using the above resins, by forming a film by mixing before forming a film, etc., to produce a film or sheet of various resins, further, if necessary, for example, a tenter method, or tubular A resin film or sheet stretched in a uniaxial or biaxial direction using a method or the like can be used.

  In the present invention, the film thickness of various resin films or sheets is preferably 6 to 300 μm, more preferably 9 to 150 μm.

  In the present invention, the film or sheet of various resins preferably has a visible light transmittance of 90% or more, preferably 95% or more, and has a property of transmitting all incident sunlight. Things. In the present invention, the visible light transmittance can be measured by a color computer.

  When one or more of the above various resins are used and the film is formed, for example, the processability, heat resistance, weather resistance, mechanical properties, dimensional stability, antioxidant property, and slip property of the film are used. For the purpose of improving or modifying mold release, flame retardancy, mold resistance, electrical properties, strength, etc., various plastic compounding agents and additives can be added. From a trace amount to several tens%, it can be arbitrarily added according to the purpose.

  In the above, common additives include, for example, lubricants, crosslinking agents, antioxidants, ultraviolet absorbers, light stabilizers, fillers, reinforcing fibers, reinforcing agents, antistatic agents, flame retardants, flame retardants, foams Agents, fungicides, pigments and the like can be used, and further, a modifying resin and the like can be used.

  Thus, in the present invention, among the above additives, in order to improve weather resistance, piercing resistance and the like, one or more kinds of UV absorbers, antioxidants, or reinforcing fibers It is preferable to use films or sheets of various resins obtained by kneading.

  As the above-mentioned ultraviolet absorber, it absorbs harmful ultraviolet rays in sunlight, converts it into harmless heat energy in the molecule, and prevents the active species of photopolymerization initiation in the polymer from being excited. For example, benzophenone-based, benzotriazole-based, salcylate-based, acrylonitrile-based, metal complex-based, hindered amine-based, ultrafine titanium oxide (particle diameter: 0.01 to 0.06 μm) or ultrafine zinc oxide (0 One or more of inorganic or organic ultraviolet absorbers (e.g., 0.01 to 0.04 µm) can be used.

  Further, as the above-mentioned antioxidant, those which prevent photodeterioration or thermal deterioration of the polymer, for example, phenol-based, amine-based, sulfur-based, phosphoric acid-based antioxidants can be used. .

  Furthermore, as the above-mentioned ultraviolet absorber or antioxidant, for example, the above-mentioned benzophenone-based ultraviolet absorber or the above-mentioned phenol-based antioxidant is chemically bonded to the main chain or side chain constituting the polymer. Polymeric ultraviolet absorbers or antioxidants can also be used.

  Examples of the reinforcing fibers include glass fibers, carbon fibers, aramid fibers, polyamide fibers, polyester fibers, polypropylene fibers, polyacrylonitrile fibers, and natural fibers. Or a woven or non-woven fabric.

  The content of the above-mentioned ultraviolet absorber, antioxidant, reinforcing fiber and the like varies depending on the particle shape, density and the like, but is preferably 0.1 to 10% by weight.

2. Solar cell element Next, in the present invention, a solar cell element as a photovoltaic element constituting the above-described solar cell module will be described. Such solar cell elements include those generally used as solar cell elements, for example, single-crystal silicon solar cell elements, crystalline silicon solar cell elements such as polycrystalline silicon solar cell elements, single junction type or tandem type. amorphous silicon solar cell elements made of such as gallium arsenide (GaAs) and indium phosphide (InP) III-V group compound semiconductor solar cell element such as, cadmium-tellurium (CdTe) or and copper indium selenide (CuInSe ₂₎ or the like of the II- A group VI compound semiconductor solar cell element or the like can be used.

  Further, a thin-film polycrystalline silicon solar cell element, a thin-film microcrystalline silicon solar cell element, a hybrid element of a thin-film crystalline silicon solar cell element and an amorphous silicon solar cell element, and the like can also be used.

  Thus, in the present invention, for example, a solar cell element is formed on a substrate such as a glass substrate, a plastic substrate, or a metal substrate, on a crystalline silicon having a pn junction structure, an amorphous silicon having a pin junction structure, or the like. An electromotive force portion such as a compound semiconductor is formed to constitute a solar cell element.

3. Back protective sheet In the present invention, a back protective sheet constituting the above-described solar cell module will be described. Such a back protective sheet has heat resistance, light resistance, weather resistance such as water resistance, physical or chemical strength, excellent toughness, etc., and further, a solar cell element as a photovoltaic element Therefore, it is necessary to be excellent in scratch resistance, shock absorption and the like.

  The above-mentioned back surface protection sheet does not necessarily need to have transparency like the above-mentioned surface protection sheet, and may or may not have transparency.

  Thus, in the present invention, for example, a film or sheet of an insulating resin can be used as the back surface protection sheet. Basically, various types of resins exemplified in the surface protection sheet described above can be used. Films or sheets can be used as well.

  In the present invention, specific examples of the back surface protective sheet include, for example, polyethylene resin, polypropylene resin, cyclic polyolefin resin, fluorine resin, polystyrene resin, acrylonitrile-styrene copolymer (AS resin), Acrylonitrile-butadiene-styrene copolymer (ABS resin), polyvinyl chloride resin, poly (meth) acrylic resin, polycarbonate resin, polyester resin such as polyethylene terephthalate and polyethylene naphthalate, and polyamide resin such as various nylons , Polyimide resin, polyamide imide resin, polyaryl phthalate resin, silicone resin, polysulfone resin, polyphenylene sulfide resin, polyether sulfone resin, polyurethane resin, acetal resin, You can use various film or sheet of resin, such as cellulose-based resin.

  In the present invention, among the resin films or sheets described above, in particular, a film or sheet of a fluorine resin, a cyclic polyolefin resin, a polycarbonate resin, a poly (meth) acrylic resin, or a polyester resin is used. Is preferable.

  Thus, in the present invention, a film or sheet of the above-mentioned fluorine-based resin, cyclic polyolefin-based resin, polycarbonate-based resin, poly (meth) acryl-based resin, or polyester-based resin has mechanical properties and chemical properties. Excellent in properties, physical properties, etc., specifically, excellent in various fastnesses such as weather resistance, heat resistance, water resistance, light resistance, moisture resistance, stain resistance, chemical resistance, etc., constitute a solar cell It is useful as a protective sheet, and has excellent durability, protective functionality, etc., and is lightweight due to its flexibility, mechanical properties, chemical properties, etc., and has excellent workability, etc., and its handling is easy. It has advantages.

  In the present invention, among the various resin films or sheets as described above, similarly to the above-mentioned surface protection sheet, for example, the above-mentioned fluorine-based resin sheet, particularly, polyvinyl fluoride-based resin (PVF), or Resin sheet made of a copolymer of tetrafluoroethylene and ethylene or propylene (ETFE), or cyclic polyolefin resin sheet, particularly cyclopentadiene and its derivative, dicyclopentadiene and its derivative, or norbornadiene and its derivative It is preferable to use a cyclic polyolefin resin sheet made of a polymer or copolymer of a cyclic diene such as the above.

  Thus, in the present invention, by using the above-mentioned fluorine-based resin sheet or cyclic polyolefin-based resin sheet, excellent properties such as mechanical properties, chemical properties, and physical properties possessed by them, specific Is a backside protective sheet that constitutes a solar cell module by utilizing various properties such as weather resistance, heat resistance, water resistance, light resistance, moisture resistance, stain resistance, and chemical resistance. Therefore, it has durability, protection functionality, etc., and has advantages such as its flexibility, mechanical properties, chemical properties, etc., lightness, excellent workability, etc., and easy handling. .

  In the present invention, as the above-mentioned various resin films or sheets, various resin films or sheets are produced in the same manner as the above-mentioned surface protection sheet, and further, if necessary, in the uniaxial or biaxial direction. Stretching is also possible.

  Further, one or more of the various resins described above are used, and various plastic compounding agents and additives can be added at the time of film formation, similarly to the above-mentioned surface protective sheet. .

  Among the above-mentioned additives, one or two or more of an ultraviolet absorber, an antioxidant, or a reinforcing fiber, in order to improve weather resistance, piercing resistance, etc., in particular, similarly to the above-mentioned surface protective sheet. It is preferable to use films or sheets of various resins obtained by kneading.

  As the above-mentioned ultraviolet absorber, one or more of inorganic or organic ultraviolet absorbers can be used as described above, and as the above-mentioned antioxidant, as described above, , Phenol-based, amine-based, sulfur-based, and phosphoric acid-based antioxidants can be used. Further, as the ultraviolet absorber or antioxidant, for example, in the main chain or side chain constituting the polymer Also, a polymer-type ultraviolet absorber or an antioxidant obtained by chemically bonding the above-mentioned benzophenone-based ultraviolet absorber or the above-mentioned phenol-based antioxidant can be used.

  In addition, as the above-mentioned reinforcing fiber, for example, as described above, for example, glass fiber, carbon fiber, aramid fiber, polyamide fiber, polyester fiber, polypropylene fiber, polyacrylonitrile fiber, natural fiber, and the like can be used. , Long or short fibrous materials, or woven or non-woven fabrics.

  In the resin film or sheet described above, the film thickness is preferably from 12 to 200 μm, more preferably from 25 to 150 μm.

  Further, in the present invention, as the back surface protection sheet constituting the solar cell module, a laminated material obtained by using two or more of the above resin films or sheets and laminating them via an adhesive layer or the like Alternatively, a film or sheet of the above resin, for example, a laminated material obtained by laminating a metal foil such as an aluminum foil, furthermore, a metal plate, or, in addition, considering the decorativeness, design, etc. of the back surface of the solar cell module. In addition, a resin film or sheet obtained by coloring or decorating the above resin film or sheet with a coloring agent such as a dye or a pigment can also be used.

  Further, in the present invention, a so-called color steel sheet having a coating film provided on the surface of the steel sheet can be preferably used as a material that satisfies the above-mentioned required properties of the back protective sheet.

  The original steel sheet of the color steel sheet is not particularly limited as long as it is generally used for a color steel sheet, but is excellent in corrosion resistance, workability, heat resistance, heat reflection property, and durability. It is preferable to use a galvalume steel plate in which steel is coated with an alloy of zinc and aluminum because of its excellent properties and excellent sacrificial rust preventive action on iron.

  The coating film is not particularly limited as long as it can form an insulating film on the surface of a steel plate to impart corrosion resistance and decorativeness. For example, a fluororesin coating film or a polyester coating film can be used. A film or the like can be preferably used. This is because the fluororesin-based coating film has excellent stain resistance, chemical resistance, corrosion resistance, and heat resistance, and the polyester-based coating film has excellent corrosion resistance and low cost.

  When the above-mentioned color steel sheet is used as the back surface protection sheet, it is preferable to use the filler sheet (B) of the present invention as the filler sheet. Since the filler sheet (B) uses a maleic anhydride-modified polyolefin, it reacts with a polar group present on the surface of the coating film to ensure high adhesion stability even for such a coating film. It is.

  In the present invention, the above-mentioned film or sheet may be any of unstretched and uniaxially or biaxially stretched.

  The thickness is arbitrary, but can be selected from the range of several μm to 3 mm.

  Further, in the present invention, the film or sheet may be a film having any property such as extrusion film formation, inflation film formation, coating film and the like.

4. Other materials In the present invention, when manufacturing the solar cell module according to the above-described present invention, in order to improve its strength, weather resistance, various robustness such as scratch resistance, other materials, for example, Low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer, ethylene-acryl Acid or methacrylic acid copolymer, methylpentene polymer, polybutene resin, polyvinyl chloride resin, polyvinyl acetate resin, polyvinylidene chloride resin, vinyl chloride-vinylidene chloride copolymer, poly (meth) acrylic resin , Polyacrylonitrile resin, polystyrene resin, Acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), polyester resin, polyamide resin, polycarbonate resin, polyvinyl alcohol resin, ethylene-vinyl acetate copolymer Can be arbitrarily selected from films or sheets of commonly used resins such as saponified compounds, fluorine resins, diene resins, polyacetal resins, polyurethane resins and nitrocellulose.

5. Next, a method of manufacturing the solar cell module according to the present invention will be described. When showing an example of such a production method, generally used methods, for example, a surface protection sheet, a filler sheet according to the present invention, a solar cell element as a photovoltaic element, a filler sheet according to the present invention, and A lamination method in which backside protection sheets and the like are opposed to each other and sequentially laminated, and if necessary, any other material is laminated between the respective layers, and then these are integrated by vacuum suction or the like and heated and pressed. A method for producing the solar cell module according to the present invention by using a normal molding method such as that described above and heat-press-molding each of the above-mentioned layers as an integral molded body to produce the solar cell module according to the present invention. In the above method, a surface protection sheet and a filler sheet are pre-laminated and integrated, or a back protection sheet and a filler sheet are pre-laminated and integrated. You can also.

  In the above, if necessary, a heat-melting adhesive containing a resin such as a (meth) acrylic resin, an olefin-based resin, or a vinyl-based resin as a main component of the vehicle, or a solvent-based adhesive, in order to enhance the adhesiveness between the respective layers. An adhesive, a light effect type adhesive or the like can be used.

  In the above-mentioned lamination, each lamination-facing surface is, if necessary, for example, corona discharge treatment, ozone treatment, low-temperature plasma treatment using oxygen gas or nitrogen gas, A pretreatment such as an electric discharge treatment, an oxidation treatment using a chemical agent or the like can be optionally performed.

  Furthermore, in the above-mentioned lamination, a primer coating agent layer, an undercoating agent layer, an adhesive layer, or an anchor coating agent layer or the like is arbitrarily formed on each layer-facing surface, and surface pretreatment is performed. Can also.

  Examples of the coating agent layer for the above pretreatment include polyester resin, polyamide resin, polyurethane resin, epoxy resin, phenolic resin, (meth) acrylic resin, polyvinyl acetate resin, polyethylene and polypropylene. A resin composition containing a polyolefin-based resin or a copolymer or modified resin thereof, a cellulose-based resin, or the like as a main component of a vehicle can be used.

  Further, in the above, as a method of forming the coating agent layer, for example, using a coating agent such as a solvent type, an aqueous type, or an emulsion type, a coating method such as a roll coating method, a gravure roll coating method, and a kiss coating method. Can be used for coating.

  In the solar cell module according to the present invention, the material constituting the filler sheet can be stably manufactured at low cost without being affected by the manufacturing conditions of the solar cell module, and thereby, the strength and the like can be improved. It is possible to manufacture a solar cell module which is excellent in weather resistance, heat resistance, water resistance, light resistance, wind pressure resistance, and hail resistance, and is extremely durable.

  Thus, the solar cell module according to the present invention is suitable for various uses, for example, together with a crystalline silicon solar cell element and an amorphous solar cell element, a roof-mounted solar cell of a house widely used generally for ground use, It is used for roofing type solar cells embedded in the roof of a house.

  Further, the amorphous solar cell element can be used for watches, calculators and the like for consumer use, and is extremely useful.

  Note that the present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and has substantially the same configuration as the technical idea described in the claims of the present invention, and any device having the same operation and effect can be realized by the present invention. It is included in the technical scope of the invention.

  Hereinafter, the present invention will be described more specifically with reference to examples.

Example 1
(1) Production of Filler Sheet (A) 100 parts by weight of linear low-density polyethylene, 3 parts by weight of vinyltrimethoxysilane, and 0.1 of a free radical generator (t-butyl-peroxyisobutyrate) Parts by weight, and 2.5 parts by weight of a hindered amine-based light stabilizer, 85 parts by weight of a silane-modified linear low-density polyethylene having a silane modification rate of 2% and graft-polymerized at an extrusion temperature of 200 ° C. 7.5 parts by weight of a system-based ultraviolet absorber and 5 parts by weight of a phosphorus-based heat stabilizer were mixed, melted and processed to obtain a master batch.

  To 100 parts by weight of the above silane-modified linear low-density polyethylene, 3 parts by weight of the above master batch was added, and a resin molding temperature of 230 ° C. was taken using a 25 mmφ extruder and a film forming machine having a 300 mm width T die. A film having a thickness of 400 μm was formed at a speed of 3 m / min.

The above film formation could be performed without any trouble. Further, the film obtained above had good appearance and total light transmittance. Further, regarding the peel strength between the surface protective sheet, the back protective sheet, and the solar cell element (cell), even after being left for 1000 hours in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 85%, it is favorable without peeling easily. Condition. In addition, even after being left for 500 hours in a sunshine weather test (illuminance of sunshine carbon arc lamp: 255 W / m ² , temperature: 60 ° C., humidity: 60%), it was in a good state without easily peeling off.

(2) Manufacture of solar cell module Using the film manufactured above as a filler sheet, a glass plate having a thickness of 3 mm, the film manufactured above having a thickness of 400 μm, and a solar cell element made of amorphous silicon were arranged in parallel. 38 μm-thick biaxially stretched polyethylene terephthalate film, 400 μm-thick film produced above, and as a backside protective sheet, a 38 μm-thick polyvinyl fluoride resin sheet (PVF), 30 μm-thick aluminum foil and A laminated sheet made of a polyvinyl fluoride resin sheet (PVF) having a thickness of 38 μm is laminated via an adhesive layer of an acrylic resin, and the solar cell element surface thereof is directed upward to form a vacuum for manufacturing a solar cell module. After temporarily press-bonding at 150 ° C for 15 minutes using a laminator, heat it at 150 ° C for 15 minutes in A solar cell module according to the invention was manufactured.

Even after the solar cell module was allowed to stand for 1000 hours in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 85%, no change was observed in the appearance, and the decrease in electromotive force was 5% or less. Even after standing for 500 hours in a sunshine weather test (illuminance of sunshine carbon arc lamp: 255 W / m ² , temperature: 60 ° C., humidity: 60 ° C.), no change was observed in the appearance, and the decrease in electromotive force was within 5%. Was.

Example 2
Except that 0.15 parts by weight of vinyltrimethoxysilane and 0.1% of a silane modification rate were used, the filler sheet according to the present invention and the solar cell module using the same were exactly the same as in Example 1 described above. Manufactured.

  The production condition, appearance, total light transmittance, peel strength after leaving the film in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 85% for 1000 hours were the same as those in Example 1.

Further, the appearance and electromotive force of the solar cell module manufactured using the above film after being left in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 85% for 1000 hours were the same as those in Example 1. Even after standing for 500 hours in a sunshine weather test (illuminance of sunshine carbon arc lamp: 255 W / m ² , temperature: 60 ° C., humidity: 60 ° C.), no change was observed in the appearance, and the decrease in electromotive force was within 5%. Was.

Example 3
A hindered amine light stabilizer was added to 70 parts by weight of a silane-modified linear low-density polyethylene having a silane modification rate of 4% prepared in exactly the same manner as in Example 1 except that 6 parts by weight of vinyltrimethoxysilane was used. 10 parts by weight, 10 parts by weight of a benzophenone-based ultraviolet absorber, and 10 parts by weight of a phosphorus-based heat stabilizer were mixed, melted and processed to obtain a master batch.

  A 400 μm thick film was formed in the same manner as in Example 1 except that 26 parts by weight of the master batch was added to 100 parts by weight of the silane-modified linear low-density polyethylene.

  The production condition, appearance, total light transmittance, peel strength after leaving the film in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 85% for 1000 hours were the same as those in Example 1.

Further, the appearance and electromotive force of the solar cell module manufactured using the above film after being left in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 85% for 1000 hours were the same as those in Example 1. Even after standing for 500 hours in a sunshine weather test (illuminance of sunshine carbon arc lamp: 255 W / m ² , temperature: 60 ° C., humidity: 60 ° C.), no change was observed in the appearance, and the decrease in electromotive force was within 5%. Was.

Example 4
85 parts by weight of a silane-modified linear low-density polyethylene having a silane modification rate of 2% and a weight of 3 parts by weight of a hindered amine-based light stabilizer, 6 parts by weight of a benzophenone-based ultraviolet absorber, and phosphorus Six parts by weight of the system heat stabilizer were mixed and melted and processed to obtain a master batch.

  A film having a thickness of 400 μm was formed in the same manner as in Example 1 except that 1 part by weight of the master batch was added to 100 parts by weight of the silane-modified linear low-density polyethylene.

  The production condition, appearance, total light transmittance, peel strength after leaving the film in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 85% for 1000 hours were the same as those in Example 1.

Further, the appearance and electromotive force of the solar cell module manufactured using the above film after being left in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 85% for 1000 hours were the same as those in Example 1. Even after standing for 500 hours in a sunshine weather test (illuminance of sunshine carbon arc lamp: 255 W / m ² , temperature: 60 ° C., humidity: 60 ° C.), no change was observed in the appearance, and the decrease in electromotive force was within 5%. Was.

Example 5
3 parts by weight of vinylmethoxysilane and 0.1 part by weight of a free radical generator (t-butyl-peroxyisobutyrate) are mixed with 100 parts by weight of linear low-density polyethylene, and graft polymerization is performed at an extrusion temperature of 200 ° C. Then, a silane-modified linear low-density polyethylene having a silane modification rate of 2% was prepared.
Next, 2.5 parts by weight of a hindered amine-based light stabilizer, 3.5 parts by weight of a benzophenone-based ultraviolet absorber, and 5 parts by weight of a phosphorus-based heat stabilizer were mixed with 89 parts by weight of the linear low-density polyethylene. It was melted and processed to make a master batch.

  5 parts by weight of the master batch was added to 100 parts by weight of the silane-modified linear low-density polyethylene, and a 400 μm-thick film was formed by T-die extrusion in the same manner as in Example 1.

The above film formation could be performed without any trouble. Further, the film obtained above had good appearance and total light transmittance. Regarding the peel strength stability between the surface protective sheet, the back protective sheet and the cell, even after being left for 1000 hours in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 85%, it was in a good state without easily peeling. In addition, even after being left for 500 hours in a sunshine weather test (illuminance of sunshine carbon arc lamp: 255 W / m ² , temperature: 60 ° C., humidity: 60%), it was in a good state without easily peeling off.

Using the film produced above as a filler sheet, a solar cell module according to the present invention was produced in the same manner as in Example 1. Even after the solar cell module was allowed to stand for 1000 hours in a high-temperature and high-humidity state at a temperature of 85% and a humidity of 85%, no change was observed in the appearance, and the decrease in electromotive force was within 5%. Further, even after standing for 500 hours in a sunshine weather test (sunshine carbon arc lamp illuminance: 255 W / m ² , temperature: 60 ° C., humidity: 60%), no change was observed in the appearance, and the decrease in electromotive force was within 5%. Was.

Example 6
To 20 parts by weight of the silane-modified linear low-density polyethylene produced in Example 5, 80 parts by weight of the linear low-density polyethylene and 5 parts by weight of the master batch produced in Example 5 were added. A mixture of the above-mentioned silane-modified linear low-density polyethylene, linear low-density polyethylene and masterbatch was extruded into a film having a thickness of 400 μm by T-die extrusion in the same manner as in Example 1.

The above film formation could be performed without any trouble. Further, the film obtained above had good appearance and total light transmittance. Regarding the peel strength stability between the surface protective sheet, the back protective sheet and the cell, even after being left for 1000 hours in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 85%, it was in a good state without easily peeling. In addition, even after being left for 500 hours in a sunshine weather test (illuminance of sunshine carbon arc lamp: 255 W / m ² , temperature: 60 ° C., humidity: 60%), it was in a good state without easily peeling off.

Using the film produced above as a filler sheet, a solar cell module according to the present invention was produced in the same manner as in Example 1. Even after the solar cell module was allowed to stand for 1000 hours in a high-temperature and high-humidity state at a temperature of 85% and a humidity of 85%, no change was observed in the appearance, and the decrease in electromotive force was within 5%. Further, even after standing for 500 hours in a sunshine weather test (sunshine carbon arc lamp illuminance: 255 W / m ² , temperature: 60 ° C., humidity: 60%), no change was observed in the appearance, and the decrease in electromotive force was within 5%. Was.

Example 7
0.0001 parts by weight of vinylmethoxysilane and 0.1 part by weight of a free radical generator (t-butyl-peroxyisobutyrate) are mixed with 100 parts by weight of linear low-density polyethylene, and grafted at an extrusion temperature of 200 ° C. A silane-modified linear low-density polyethylene having a silane modification ratio of 0.0001% was produced by polymerization and silane modification.
Next, 2.5 parts by weight of a hindered amine-based light stabilizer, 3.5 parts by weight of a benzophenone-based ultraviolet absorber, and 5 parts by weight of a phosphorus-based heat stabilizer were mixed with 89 parts by weight of the linear low-density polyethylene. It was melted and processed to make a master batch.

  5 parts by weight of the master batch was added to 100 parts by weight of the silane-modified linear low-density polyethylene, and a 400 μm-thick film was formed by T-die extrusion in the same manner as in Example 1.

  The peel strength of the film obtained above with respect to the surface protection sheet, the back surface protection sheet and the cells was inferior to those of Examples 1 to 6, but was within a practically sufficient range.

  Using the film produced above as a filler sheet, a solar cell module according to the present invention was produced in the same manner as in Example 1. After leaving the above solar cell module in a high-temperature and high-humidity state at a temperature of 85% and a humidity of 85% for 1000 hours, delamination with the surface protection sheet, the back surface protection sheet, and the cell was partially observed, and the decrease in electromotive force was 5%. %, But within a practically sufficient range.

Example 8
To 100 parts by weight of linear low-density polyethylene, 40 parts by weight of vinylmethoxysilane and 0.1 part by weight of a free radical generator (t-butyl-peroxyisobutyrate) were mixed and subjected to graft polymerization at an extrusion temperature of 200 ° C. A silane-modified linear low-density polyethylene having a silane modification rate of 3% was prepared.
Next, 2.5 parts by weight of a hindered amine-based light stabilizer, 3.5 parts by weight of a benzophenone-based ultraviolet absorber, and 5 parts by weight of a phosphorus-based heat stabilizer were mixed with 89 parts by weight of the linear low-density polyethylene. It was melted and processed to make a master batch.

  5 parts by weight of the master batch was added to 100 parts by weight of the silane-modified linear low-density polyethylene, and a 400 μm-thick film was formed by T-die extrusion in the same manner as in Example 1.

  The peel strength of the film obtained above with respect to the surface protection sheet, the back surface protection sheet and the cells was inferior to those of Examples 1 to 6, but was within a practically sufficient range.

  Using the film produced above as a filler sheet, a solar cell module according to the present invention was produced in the same manner as in Example 1. After leaving the above solar cell module in a high-temperature and high-humidity state at a temperature of 85% and a humidity of 85% for 1000 hours, delamination with the surface protection sheet, the back surface protection sheet, and the cell was partially observed, and the decrease in electromotive force was 5%. %, But within a practically sufficient range.

Example 9
3 parts by weight of vinylmethoxysilane and 0.1 part by weight of a free radical generator (t-butyl-peroxyisobutyrate) were mixed with 100 parts by weight of linear low-density polyethylene, and the mixture was subjected to graft polymerization at an extrusion temperature of 200 ° C. A silane-modified linear low-density polyethylene having a silane modification rate of 2% was prepared.
Next, 2.5 parts by weight of a hindered amine-based light stabilizer, 0.001 parts by weight of a benzophenone-based ultraviolet absorber, and 5 parts by weight of a phosphorus-based heat stabilizer were added to 92.5 parts by weight of the linear low-density polyethylene. The mixture was melted and processed to form a master batch.

  5 parts by weight of the master batch was added to 100 parts by weight of the silane-modified linear low-density polyethylene, and a 400 μm-thick film was formed by T-die extrusion in the same manner as in Example 1.

The above film formation could be performed without any trouble. The film obtained above had good appearance and total light transmittance. Regarding the peel strength stability between the surface protection sheet, the back surface protection sheet and the cell, it should be maintained after leaving for 500 hours in a sunshine weather test (sunshine carbon arc lamp illuminance 255 W / m ² , temperature 60 ° C., humidity 60%). However, although peeling was not possible, the peel strength was inferior to those of Examples 1 to 6, but within a practically sufficient range.

Using the film produced above as a filler sheet, a solar cell module according to the present invention was produced in the same manner as in Example 1. After the above-described solar cell module was left for 500 hours in a sunshine weather test (sunshine carbon arc lamp illuminance 255 W / m ² , temperature 60 ° C., humidity 60%), the decrease in electromotive force exceeded 5%. It was within a sufficient range.

Example 10
100 parts by weight of linear low-density polyethylene were mixed with 3 parts by weight of vinylmethoxysilane and 0.1 part by weight of a free radical generator (t-butyl-peroxyisobutyrate) and graft-polymerized at an extrusion temperature of 200 ° C. A modified silane-modified linear low-density polyethylene having a silane modification rate of 2% was produced.
Next, 0.001 part by weight of a hindered amine-based light stabilizer, 2.5 parts by weight of a benzophenone-based ultraviolet absorber, and 5 parts by weight of a phosphorus-based heat stabilizer were added to 91.5 parts by weight of the linear low-density polyethylene. The mixture was melted and processed to form a master batch.

  5 parts by weight of the master batch was added to 100 parts by weight of the silane-modified linear low-density polyethylene, and a 400 μm-thick film was formed by T-die extrusion in the same manner as in Example 1.

The above film formation could be performed without any trouble. Further, the film obtained above had good appearance and total light transmittance. Regarding the peel strength stability between the surface protection sheet, the back surface protection sheet and the cell, it should be maintained after leaving for 500 hours in a sunshine weather test (sunshine carbon arc lamp illuminance 255 W / m ² , temperature 60 ° C., humidity 60%). However, although peeling was not possible, the peel strength was inferior to those of Examples 1 to 6, but within a practically sufficient range.

Using the film produced above as a filler sheet, a solar cell module according to the present invention was produced in the same manner as in Example 1. After the above-described solar cell module was left for 500 hours in a sunshine weather test (sunshine carbon arc lamp illuminance 255 W / m ² , temperature 60 ° C., humidity 60%), the decrease in electromotive force exceeded 5%. It was within a sufficient range.

Example 11
100 parts by weight of linear low-density polyethylene were mixed with 3 parts by weight of vinylmethoxysilane and 0.1 part by weight of a free radical generator (t-butyl-peroxyisobutyrate) and graft-polymerized at an extrusion temperature of 200 ° C. A modified silane-modified linear low-density polyethylene having a silane modification rate of 2% was produced.
Next, 3.5 parts by weight of a hindered amine-based light stabilizer, 2.5 parts by weight of a benzophenone-based ultraviolet absorber, and 0.001 part by weight of a phosphorus-based heat stabilizer were added to 89 parts by weight of the linear low-density polyethylene. The mixture was melted and processed to form a master batch.

  5 parts by weight of the above master batch was added to 100 parts by weight of the silane-modified linear low-density polyethylene, and a 400-μm-thick film was formed by T-die extrusion in the same manner as in Example 1. Was subjected to oxidative deterioration and thermal crosslinking, and non-uniform gelation was observed in a part of the appearance of the film obtained above, which was within a practically sufficient range.

Example 12
100 parts by weight of linear low-density polyethylene were mixed with 3 parts by weight of vinylmethoxysilane and 0.1 part by weight of a free radical generator (t-butyl-peroxyisobutyrate) and graft-polymerized at an extrusion temperature of 200 ° C. A modified silane-modified linear low-density polyethylene having a silane modification rate of 2% was produced.
Next, 2.5 parts by weight of a hindered amine-based light stabilizer, 60 parts by weight of a benzophenone-based ultraviolet absorber, and 5 parts by weight of a phosphorus-based heat stabilizer were mixed with 32.5 parts by weight of the linear low-density polyethylene. It was melted and processed to make a master batch.

  10 parts by weight of the master batch was added to 100 parts by weight of the silane-modified linear low-density polyethylene, and a 400-μm-thick film was formed by T-die extrusion in the same manner as in Example 1.

  The above film formation could be performed without any trouble. The film obtained above had good appearance and total light transmittance. Regarding the peel strength stability between the surface protective sheet, the back protective sheet and the cell, after leaving for 1000 hours in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 85%, it was not able to be maintained and was partially peeled off. Although the peel strength stability was inferior to that of Nos. 6 to 6, it was within a practically sufficient range.

  Using the film produced above as a filler sheet, a solar cell module according to the present invention was produced in the same manner as in Example 1. After leaving the solar cell module in a high-temperature and high-humidity state at a temperature of 85% and a humidity of 85% for 1000 hours, the reduction of the electromotive force exceeded 5%, which was within a practically sufficient range.

Example 13
100 parts by weight of linear low-density polyethylene were mixed with 3 parts by weight of vinylmethoxysilane and 0.1 part by weight of a free radical generator (t-butyl-peroxyisobutyrate) and graft-polymerized at an extrusion temperature of 200 ° C. A modified silane-modified linear low-density polyethylene having a silane modification rate of 2% was produced.
Next, 60 parts by weight of a hindered amine-based light stabilizer, 2.5 parts by weight of a benzophenone-based ultraviolet absorber, and 5 parts by weight of a phosphorus-based heat stabilizer were mixed with 32.5 parts by weight of the linear low-density polyethylene. It was melted and processed to make a master batch.

  10 parts by weight of the master batch was added to 100 parts by weight of the silane-modified linear low-density polyethylene, and a 400-μm-thick film was formed by T-die extrusion in the same manner as in Example 1.

  The above film formation could be performed without any trouble. Further, the film obtained above had good appearance and total light transmittance. Regarding the peel strength stability between the surface protective sheet, the back protective sheet and the cell, after leaving for 1000 hours in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 85%, it was not able to be maintained and was partially peeled off. Although the peel strength stability was inferior to that of Nos. 6 to 6, it was within a practically sufficient range.

  Using the film produced above as a filler sheet, a solar cell module according to the present invention was produced in the same manner as in Example 1. After leaving the solar cell module in a high-temperature and high-humidity state at a temperature of 85% and a humidity of 85% for 1000 hours, the reduction of the electromotive force exceeded 5%, which was within a practically sufficient range.

Example 14
100 parts by weight of linear low-density polyethylene were mixed with 3 parts by weight of vinylmethoxysilane and 0.1 part by weight of a free radical generator (t-butyl-peroxyisobutyrate) and graft-polymerized at an extrusion temperature of 200 ° C. A modified silane-modified linear low-density polyethylene having a silane modification rate of 2% was prepared.
Next, 3.5 parts by weight of a hindered amine-based light stabilizer, 2.5 parts by weight of a benzophenone-based ultraviolet absorber, and 60 parts by weight of a phosphorus-based heat stabilizer were added to 32.5 parts by weight of the linear low-density polyethylene. The mixture was melted and processed to form a master batch.

  10 parts by weight of the master batch was added to 100 parts by weight of the silane-modified linear low-density polyethylene, and a 400-μm-thick film was formed by T-die extrusion in the same manner as in Example 1.

  The above film formation could be performed without any trouble. Further, the film obtained above had good appearance and total light transmittance. Regarding the peel strength stability between the surface protective sheet, the back protective sheet and the cell, after leaving for 1000 hours in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 85%, it was not able to be maintained and was partially peeled off. Although the peel strength stability was inferior to that of Nos. 6 to 6, it was within a practically sufficient range.

  Using the film produced above as a filler sheet, a solar cell module according to the present invention was produced in the same manner as in Example 1. After leaving the solar cell module in a high-temperature and high-humidity state at a temperature of 85% and a humidity of 85% for 1000 hours, the reduction of the electromotive force exceeded 5%, which was within a practically sufficient range.

Example 15
To 20 parts by weight of the silane-modified linear low density prepared in Example 5, 99.99 parts by weight of the linear low density polyethylene and 5 parts by weight of the master batch prepared in Example 5 were added. A mixture of the above-mentioned silane-modified linear low-density polyethylene, linear low-density polyethylene and masterbatch was extruded into a film having a thickness of 400 μm by T-die extrusion in the same manner as in Example 1.

  The above film formation could be performed without any trouble. Further, the film obtained above had good appearance and total light transmittance. The peel strength of the film obtained above with respect to the surface protective sheet, the back protective sheet and the cell was low and partially peeled off, and the peel strength was inferior to Examples 1 to 6, but within a practically sufficient range. Was.

  Using the film produced above as a filler sheet, a solar cell module according to the present invention was produced in the same manner as in Example 1. After leaving the above solar cell module in a high-temperature and high-humidity state at a temperature of 85% and a humidity of 85% for 1000 hours, delamination between the surface protection sheet, the back surface protection sheet and the cell is observed, and the decrease in electromotive force exceeds 5%. However, it was within a practically sufficient range.

Example 16
(1) Production of filler sheet (B) 100 parts by weight of linear low-density polyethylene synthesized by copolymerizing ethylene with 1-butene at a ratio of 8% by weight, 2 parts by weight of maleic anhydride, and free radical 3 parts by weight of a generator (t-butyl-peroxybenzoate) were mixed, and the mixture was graft-polymerized at an extrusion temperature of 200 ° C. and modified with maleic anhydride to obtain 85 parts by weight of a linear low-density polyethylene having a maleic anhydride modification rate of 0.08%. Parts, 2.5 parts by weight of a hindered amine-based light stabilizer, 7.5 parts by weight of a benzophenone-based ultraviolet absorber, and 5 parts by weight of a phosphorus-based heat stabilizer were mixed and melted and processed to obtain a master batch.

  The weight average molecular weight of the above maleic anhydride-modified linear low-density polyethylene determined by gel permeation chromatography (GPC) was 33,700. The ratio (Mw / Mn) between the weight average molecular weight (Mw) and the number average molecular weight (Mn) was 1.01.

  To 100 parts by weight of the above-mentioned maleic anhydride-modified linear low-density polyethylene, 5 parts by weight of the above-mentioned master batch was added, and a 25 mmφ extruder was used. A film having a thickness of 400 μm was formed at a take-up speed of 3 m / min.

  The above film formation could be performed without any trouble. Further, the film obtained above had good appearance and total light transmittance.

  Regarding the peel strength, even after being left for 1000 hours in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 85%, it was in a good state without easily peeling.

(2) Manufacture of solar cell module The film manufactured above was used as a filler sheet, and as a surface protection sheet, ETFE having been subjected to an atmospheric pressure plasma treatment with a thickness of 50 μm, the film manufactured above with a thickness of 400 μm, amorphous A 50 μm thick polyimide film in which solar cell elements made of silicon are arranged in parallel, a 400 μm thick film produced above, and a galvalume steel plate coated with an alloy of zinc and aluminum on steel as a backside protection sheet Then, a 500 μm-thick color steel plate coated with a polyester-based coating film is laminated, the solar cell element surface thereof is directed upward, and temporarily pressed at 150 ° C. for 15 minutes with a laminator for manufacturing a solar cell module, and then placed in an oven. And heated at 150 ° C. for 15 minutes to produce a solar cell module according to the present invention.

  Even after the solar cell module was allowed to stand for 1000 hours in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 85%, no change was observed in the appearance, and the decrease in electromotive force was within 5%.

Example 17
100 parts by weight of a linear low-density polyethylene synthesized by copolymerizing ethylene with 1-butene at a ratio of 8% by weight, 2 parts by weight of maleic anhydride, and a free radical generator (t-butyl-peroxybenzoate) 3 By weight, the mixture was mixed and subjected to graft polymerization at an extrusion temperature of 200 ° C. to produce maleic anhydride-modified maleic anhydride-modified linear low-density polyethylene having a maleic anhydride modification rate of 0.08%.
Next, 95 parts by weight of the linear low-density polyethylene was mixed with 5 parts by weight of a phosphorus-based heat stabilizer, melted and processed to obtain a master batch.

  5 parts by weight of the above master batch was added to 100 parts by weight of the maleic anhydride-modified linear low-density polyethylene, and a 400-μm-thick film was formed by T-die extrusion in the same manner as in Example 1.

  The above film formation could be performed without any trouble. Further, the film obtained above had good appearance and total light transmittance. Regarding the peel strength stability between the surface protective sheet, the back protective sheet and the cell, even after being left for 1000 hours in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 85%, it was in a good state without easily peeling.

  Using the film produced above as a filler sheet, a solar cell module according to the present invention was produced in the same manner as in Example 1. Even after the solar cell module was allowed to stand for 1000 hours in a high-temperature and high-humidity state at a temperature of 85% and a humidity of 85%, no change was observed in the appearance, and the decrease in electromotive force was within 5%.

Example 18
To 20 parts by weight of the maleic anhydride-modified linear low-density polyethylene prepared in Example 17, 80 parts by weight of the linear low-density polyethylene and 5 parts by weight of the master batch prepared in Example 17 were added. The mixture of the maleic anhydride-modified linear low-density polyethylene, the linear low-density polyethylene, and the master batch was extruded into a 400 μm-thick film by T-die extrusion in the same manner as in Example 1.

  The above film formation could be performed without any trouble. Further, the film obtained above had good appearance and total light transmittance. Regarding the peel strength stability between the surface protective sheet, the back protective sheet and the cell, even after being left for 1000 hours in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 85%, it was in a good state without easily peeling.

  Using the film produced above as a filler sheet, a solar cell module according to the present invention was produced in the same manner as in Example 1. Even after the solar cell module was allowed to stand for 1000 hours in a high-temperature and high-humidity state at a temperature of 85% and a humidity of 85%, no change was observed in the appearance, and the decrease in electromotive force was within 5%.

Example 19
100 parts by weight of linear low-density polyethylene synthesized by copolymerizing ethylene with 1-butene at a ratio of 8% by weight, 0.001 part by weight of maleic anhydride, and a free radical generator (t-butyl-peroxybenzoate) 3) parts by weight were mixed and subjected to graft polymerization at an extrusion temperature of 200 ° C. to prepare maleic anhydride-modified maleic anhydride-modified linear low density polyethylene having a maleic anhydride modification rate of 0.0001%.
Next, 95 parts by weight of the linear low-density polyethylene was mixed with 5 parts by weight of a phosphorus-based heat stabilizer, melted and processed to obtain a master batch.

5 parts by weight of the above master batch was added to 100 parts by weight of the maleic anhydride-modified linear low-density polyethylene, and a 400-μm-thick film was formed by T-die extrusion in the same manner as in Example 1. The above film formation could be performed without any trouble.
The peel strength of the film obtained above with the surface protective sheet, the back protective sheet and the cells was low, and the film was partially peeled off, and the peel strength was inferior to those of Examples 16 to 18, but within a practically sufficient range. Was.

  Using the film produced above as a filler sheet, a solar cell module according to the present invention was produced in the same manner as in Example 1. After leaving the above solar cell module in a high-temperature and high-humidity state at a temperature of 85% and a humidity of 85% for 1000 hours, delamination with the surface protection sheet, the back surface protection sheet, and the cell was partially observed, and the decrease in electromotive force was 5%. %, But within a practically sufficient range.

Example 20
100 parts by weight of linear low-density polyethylene synthesized by copolymerizing ethylene with 1-butene at a ratio of 8% by weight, 40 parts by weight of maleic anhydride, and 3 parts by weight of a free radical generator (t-butylperoxybenzoate) The maleic anhydride-modified linear low-density polyethylene having a maleic anhydride modification rate of 0.1% was prepared by mixing the parts and graft-polymerizing the mixture at an extrusion temperature of 200 ° C.
Next, 95 parts by weight of the linear low-density polyethylene was mixed with 5 parts by weight of a phosphorus-based heat stabilizer, melted and processed to obtain a master batch.

5 parts by weight of the above master batch was added to 100 parts by weight of the maleic anhydride-modified linear low-density polyethylene, and a 400-μm-thick film was formed by T-die extrusion in the same manner as in Example 1.
The peel strength of the film obtained above with the surface protective sheet, the back protective sheet and the cells was low, and the film was partially peeled off, and the peel strength was inferior to those of Examples 16 to 18, but within a practically sufficient range. Was.

  Using the film produced above as a filler sheet, a solar cell module according to the present invention was produced in the same manner as in Example 1. After leaving the above-mentioned solar cell module in a high-temperature and high-humidity state at a temperature of 85% and a humidity of 85% for 1000 hours, delamination between the surface protection sheet, the back surface protection sheet and the cell is observed, and the decrease in electromotive force exceeds 5%. However, it was within a practically sufficient range.

Example 21
To 20 parts by weight of the maleic anhydride-modified linear low-density polyethylene prepared in Example 17, 99.99 parts by weight of the linear low-density polyethylene and 5 parts by weight of the master batch prepared in Example 17 were added. The mixture of the maleic anhydride-modified linear low-density polyethylene, the linear low-density polyethylene, and the master batch was extruded into a 400 μm-thick film by T-die extrusion in the same manner as in Example 1. The above film formation could be performed without any trouble.

  The peel strength of the film obtained above with the surface protective sheet, the back protective sheet and the cells was low, and the film was partially peeled off, and the peel strength was inferior to those of Examples 16 to 18, but within a practically sufficient range. Was.

  Using the film produced above as a filler sheet, a solar cell module according to the present invention was produced in the same manner as in Example 1. After leaving the above-mentioned solar cell module in a high-temperature and high-humidity state at a temperature of 85% and a humidity of 85% for 1000 hours, delamination between the surface protection sheet, the back surface protection sheet and the cell is observed, and the decrease in electromotive force exceeds 5%. However, it was within a practically sufficient range.

Comparative Example 1
As a base material, a glass plate having a thickness of 3 mm is used as a surface protection sheet for a solar cell module, and a solar cell element made of an ethylene-vinyl acetate copolymer sheet having a thickness of 400 μm and amorphous silicon is arranged in parallel on one surface thereof. A 38 μm-thick biaxially oriented polyethylene terephthalate film, a 400 μm-thick ethylene-vinyl acetate copolymer sheet, and a 50 μm-thick biaxially oriented polyethylene terephthalate film as a backside protective sheet, were placed in a solar cell element. The solar cell module was manufactured in the same manner as in Example 1 above, with the surface facing upward and laminated via an adhesive layer of an acrylic resin.

Comparative Example 2
As a base material, a glass plate having a thickness of 3 mm is used as a surface protection sheet for a solar cell module, and a low-density polyethylene sheet having a thickness of 400 μm and solar cell elements made of amorphous silicon are arranged in parallel on one surface thereof. A 38 μm-thick biaxially stretched polyethylene terephthalate film, a 400 μm-thick low-density polyethylene sheet, and a 38 μm-thick polyvinyl fluoride resin sheet (PVF), a 30 μm-thick aluminum foil and a 38 μm-thickness as a backside protection sheet A laminated sheet made of the above-mentioned polyvinyl fluoride resin sheet (PVF) is laminated via an adhesive layer of an acrylic resin, and the solar cell element surface is directed upward, and the solar cell is formed in the same manner as in Example 1 described above. A battery module was manufactured.

Experimental Example Regarding the solar cell module manufactured using the filler sheet according to the present invention manufactured in Examples 1 to 21 and the solar cell module manufactured using the filler layer according to Comparative Examples 1 and 2 After standing for 1000 hours in a high-temperature and high-humidity state at a temperature of 85 ° C and a humidity of 90%, the total light transmittance was measured, and a solar cell module evaluation test was performed.

(1) Measurement of total light transmittance In Examples 1 to 21, the filler sheet used for manufacturing the solar cell module of the present invention and the filler layer used for manufacturing the solar cell module in Comparative Examples 1 and 2 The total light transmittance (%) was measured by a color computer.

(2) Solar cell module evaluation test Based on JIS standard C8917-1989, a solar cell module manufactured using the filler sheet according to Examples 1-21 and the filler layer according to Comparative Examples 1-2 are used. The solar cell module manufactured as described above was subjected to an environmental test of the solar cell module, and the output of photovoltaic power before and after the test was measured and compared and evaluated.

(3) Measurement of Peeling Strength of Filler Layer A cut was made to a width of 15 mm in the backmost backside protective sheet and the filler sheet (filler layer) located inside.
Next, the solar cell elements with 15 mm width cuts are arranged in parallel, and at the interface between the 38 μm-thick polyimide film and the filler sheet (filler layer), the peeling speed is 50 mm / min and the peeling is performed at 90 °. , And the peel strength was measured.

(4) Measurement of Peeling Strength Stability of Filler Layer with Backside Protection Sheet Solar cell modules manufactured using the filler sheets (filler layers) according to Examples 1 to 21 and Comparative Examples 1 and 2 After leaving the solar cell module manufactured using such a filler layer in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 90% for 1000 hours, a cut was made to a width of 15 mm on the rearmost backside protective sheet. The peel strength before and after the high-temperature and high-humidity test was measured and compared at the interface between the back protective sheet and the filler sheet (filler layer), which had been cut into 15 mm widths.

(5) Measurement of Peeling Strength Stability of Filler Layer with Surface Protective Sheet The solar cell module manufactured using the filler sheet (filler layer) according to Examples 1 to 21 and Comparative Examples 1 and 2 After leaving the solar cell module manufactured using such a filler layer in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 90% for 1000 hours, the outermost surface protective sheet, or the outermost rear surface protective sheet and the inner side thereof Of the filler sheet (filler layer) and the film in which the solar cell elements were arranged in parallel, and a filler sheet (filler layer) located further inside thereof were cut to a width of 15 mm. At the interface between the surface protection sheet and the filler sheet (filler layer) having a 15 mm width cut, the peel strength before and after the high-temperature and high-humidity test was measured and comparatively evaluated.

(6) Measurement of Peeling Strength Stability of Filler Layer with Solar Cell Element (Cell) A solar cell module manufactured using the filler sheet (filler layer) according to Examples 1 to 21, and Comparative Example 1 After leaving the solar cell module manufactured using the filler layer according to Nos. 1 to 2 in a high-temperature and high-humidity state at a temperature of 85 ° C. and a humidity of 90% for 1000 hours, the outermost surface protection sheet or the lowermost surface backsheet. And a film in which the solar cell element and the filler sheet (filler layer) located inside thereof and the solar cell element were arranged in parallel, and a filler sheet (filler layer) located further inside thereof were cut into 15 mm widths. The peel strength before and after the high-temperature and high-humidity test was measured and comparatively evaluated at the interface between the solar cell element and the filler sheet (filler layer) having a 15 mm width cut.

  Table 1 shows the above measurement results.

  As is clear from the measurement results shown in Table 1, the filler sheets according to Examples 1 to 21 had a high total light transmittance, a low output reduction rate, and were practically sufficient. Further, the filler sheets according to Examples 1 to 21 were also excellent in peel strength, and also excellent in peel strength stability between the surface protection sheet and the back surface protection sheet.

  On the other hand, the filler layers according to Comparative Examples 1 and 2 have high total light transmittance, but the solar cell module using them has problems such as a high output reduction rate. In addition, the filler layers according to Comparative Examples 1 and 2 were inferior in peel strength and low in adhesion stability with each protective sheet.

It is a figure showing the outline of layer composition which is an example about the solar cell module manufactured using the filler sheet concerning the present invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 ... Surface protection sheet 2 ... Filler sheet 3 ... Solar cell element 4 ... Filler sheet 5 ... Backside protection sheet 10 ... Solar cell module

Claims (21)

As a filler sheet to be laminated on the front side and the back side of the solar cell element, a copolymer of an α-olefin and an ethylenically unsaturated silane compound or a modified or condensed product thereof, a light stabilizer, an ultraviolet absorber, and heat stability A filler sheet for a solar cell module, wherein the filler sheet comprises a resin film of a resin composition containing at least one selected from the group consisting of agents. α-olefin is ethylene, propylene, 1-butene, isobutylene, 1-pentene, 2-methyl-1-butene, 3-methyl-1-butene, 1-hexene, 1-heptene, 1-octene, 1-nonene The filler sheet for a solar cell module according to claim 1, wherein the filler sheet comprises one or more members selected from the group consisting of, and 1-decene. When the ethylenically unsaturated silane compound is vinyltrimethoxysilane, vinyltriethoxysilane, vinyltripropoxysilane, vinyltriisopropoxysilane, vinyltributoxysilane, vinyltripentyloxysilane, vinyltriphenoxysilane, vinyltribenzyloxysilane And one or more selected from the group consisting of vinyltrimethylenedioxysilane, vinyltriethylenedioxysilane, vinylpropionyloxysilane, vinyltriacetoxysilane, and vinyltricarboxysilane. The filler sheet for a solar cell module according to claim 1 or 2. The copolymer of an α-olefin and an ethylenically unsaturated silane compound may further comprise at least one selected from the group consisting of vinyl acetate, acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, ethyl acrylate, and vinyl alcohol. The filler sheet for a solar cell module according to any one of claims 1 to 3, comprising a copolymer containing two or more kinds. A filler sheet for a solar cell, wherein the filler sheet is formed from a resin film of a resin composition containing a maleic anhydride-modified polyolefin as a filler sheet laminated on the front side and the back side of the solar cell element. The solar cell filler sheet according to claim 5, wherein the resin composition further comprises one or more members selected from the group consisting of a light stabilizer, an ultraviolet absorber, and a heat stabilizer. . The maleic anhydride-modified polyolefin is a polyolefin modified by graft copolymerization of maleic anhydride, and the maleic anhydride-modified polyolefin has a maleic anhydride content of 0.001% by weight to 30% by weight. The filler sheet for a solar cell according to claim 5 or 6, wherein the thickness is within the range. The maleic anhydride-modified polyolefin has a weight average molecular weight in the range of 1,000 to 1300,000 determined by gel permeation chromatography, and a ratio (Mw) between the weight average molecular weight (Mw) and the number average molecular weight (Mn). / Mn) is 6 or less, the filler sheet for a solar cell according to any one of claims 5 to 7. The filler sheet for a solar cell module according to any one of claims 1 to 8, wherein the light stabilizer comprises a hindered amine light stabilizer. The solar cell module according to any one of claims 1 to 9, wherein the ultraviolet absorber comprises a benzophenone-based, triazole-based, salicylic acid derivative-based, or acrylonitrile derivative-based ultraviolet absorber. Filler sheet. The solar cell module according to any one of claims 1 to 10, wherein the heat stabilizer comprises a phosphorus-based heat stabilizer, a phenol-based heat stabilizer, or a lactone-based heat stabilizer. Filler sheet. The light stabilizer is characterized by containing 0.01 to 5% by weight of a copolymer of an α-olefin and an ethylenically unsaturated silane compound or a modified or condensed product thereof, or a maleic anhydride-modified polyolefin. The filler sheet for a solar cell module according to any one of claims 1 to 11. The ultraviolet absorber contains 0.05 to 5% by weight of a copolymer of an α-olefin and an ethylenically unsaturated silane compound or a modified or condensed product thereof, or a maleic anhydride-modified polyolefin. The filler sheet for a solar cell module according to any one of claims 1 to 12, characterized in that: The heat stabilizer contains a copolymer of an α-olefin and an ethylenically unsaturated silane compound or a modified or condensed product thereof or a maleic anhydride-modified polyolefin at a content of 0.05 to 5% by weight. The filler sheet for a solar cell module according to any one of claims 1 to 13, characterized in that: A solar cell module in which a surface protection sheet, a filler sheet, a solar cell element, a filler sheet, and a back surface protection sheet are sequentially laminated and integrated, wherein the filler sheet is from claim 1 to claim 14. A solar cell module, which is the filler sheet for a solar cell module according to any one of the above. The surface protection sheet comprises a glass plate, a fluorine-based resin sheet, a cyclic polyolefin-based resin sheet, a polycarbonate-based resin sheet, a poly (meth) acryl-based resin sheet, a polyamide-based resin sheet, or a polyester-based resin sheet. The solar cell module according to claim 15, wherein The solar cell module according to claim 15, wherein the solar cell element is a crystalline silicon solar cell element or an amorphous silicon solar cell element. The back surface protection sheet is made of a metal plate or metal foil, a fluororesin sheet, a cyclic polyolefin resin sheet, a polycarbonate resin sheet, a poly (meth) acrylic resin sheet, a polyamide resin sheet, or a polyester resin sheet. The solar cell module according to any one of claims 15 to 17, characterized in that: The solar cell module according to any one of claims 15 to 18, wherein the surface protection sheet and the filler sheet are laminated and integrated in advance. The solar cell module according to any one of claims 15 to 19, wherein the back surface protection sheet and the filler sheet are laminated and integrated in advance. The solar cell module according to any one of claims 15 to 20, wherein a gel fraction of the filler sheet is 10% or less.

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