JP2015115439A - Method for manufacturing solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a solar battery module comprising a hard light-receiving surface/back sheet in a practical size, by which solar battery cell strings can be encapsulated without a cavity and adhesion reliability can be achieved.SOLUTION: The method for manufacturing a solar battery module comprises encapsulating a plurality of solar battery cell strings with a silicone cured film between a hard surface panel and a flexible back sheet, and the method includes steps of: (i) forming a silicone cured film each on one surface of a hard surface panel and of a flexible back sheet; (ii) disposing solar battery cell strings to be interposed between the silicone cured films of the hard surface panel and the flexible back sheet to form a laminate; and (iii) placing the laminate in a reduced pressure space, and pressing the laminate while heating to encapsulate the solar battery cell strings.

Description

  The present invention relates to a method for manufacturing a solar cell module.

  In recent years, interest in photovoltaic power generation has increased as an energy resource using sunlight. Here, the power generation element of the solar cell is generally made of a semiconductor such as silicon, and the solar cell module is mounted on a light-receiving surface glass substrate or the like in a state where individual solar cells are electrically interconnected.

  At that time, the front surface or the back surface side where the solar cell is exposed to light is protected from an external environment such as rain, wind, snow, and dust by being covered with the encapsulating material. In general, an ethylene-vinyl acetate copolymer (EVA) is used as an encapsulating material from the viewpoint of low cost.

  For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2000-183385) describes the use of an EVA solar cell sealing material having a vinyl acetate content of 10 to 30% by mass as a sealing material in a solar cell module. ing. However, when EVA is used as the sealing material, acetic acid is generated particularly in a high-temperature and high-humidity environment, and this generated acetic acid causes the power generation performance to deteriorate due to corrosion of solar cell electrodes. There was a problem to do. In particular, since a solar cell is expected to be used for a long period of several decades, it has been desired that the deterioration with time be promptly eliminated from the viewpoint of guarantee.

  Further, EVA is not limited to the above-mentioned problems, and has a problem that the UV resistance is low and the color is changed by being exposed to the outdoors for a long period of time.

  An example of a sealing material that does not cause these problems is silicone. For example, when silicone is used as a sealing material, the occurrence of acetic acid not only suppresses electrode corrosion, but also eliminates the yellow or brown discoloration problem. In addition, the elastic modulus does not rapidly increase at a low temperature unlike EVA, and the reliability of electrode connection is improved. For example, Non-Patent Document 1 describes performance when silicone is applied as a solar cell module sealing material.

  In the 1970s, silicone was used as a sealing material for solar cells for space use, but at the stage of mass production for ground use, the cost and manufacturing method of the liquid silicone composition became problems. At this time, there is a past in which the low-cost and film-supplied EVA that can be molded by a vacuum laminator has been replaced with silicone.

  However, in recent years, high efficiency and long-term reliability of solar cells have been greatly taken up, and silicone having high transparency and high weather resistance has attracted attention again.

  So far, various sealing methods using silicone have been proposed. In patent document 2 (Japanese translations of PCT publication No. 2007-527109), the connected solar cell is arrange | positioned with a multi-axis robot on the silicone material coated on the board | substrate, or in a silicone material, and a silicone material is hardened after that. It has been proposed to enclose without taking in bubbles.

  Moreover, in patent document 3 (Japanese translations of PCT publication No. 2011-514680), the cell press which has a movable plate is used, and a bubble is made by arrange | positioning a photovoltaic cell on hardening or semi-hardening silicone under vacuum. It has been proposed to enclose without taking up.

  Further, in Patent Document 4 (International Publication No. 2009/091068), a sealing agent, a solar cell element, and a silicone liquid substance are arranged on a glass substrate, and finally a back protection substrate is stacked to form a temporary laminate, and a vacuum at room temperature is used. A method of sealing by press-adhering under pressure has been proposed, but it is considered difficult to develop into a practical size solar cell module by this method.

  However, each of the above methods includes a step of using a liquid silicone composition in the step of sealing solar cell strings, and is completely complicated unlike the case of using a conventional EVA sheet. It is difficult for manufacturers to accept.

JP 2000-183385 A Special table 2007-527109 gazette Special table 2011-514680 gazette International Publication No. 2009/091068

Barry Ketola, Keith R .; McIntoch, Ann Norris, Mary Kay Tomalia, “Silicon For Photovoltaic Encapsulation”: 23rd European Photovoltaic Solar Energy Conference 2008, p. 2969-2933

  The present invention has been made in view of the above problems, and when using silicone as a sealing material, the solar cell strings are sealed without leaving a void without using a liquid silicone composition, Provided is a method for producing a silicone-sealed solar cell module that can manufacture a solar cell module that prevents moisture from entering, and that can be easily sealed using a vacuum laminator used by a solar cell module manufacturer for conventional production For the purpose.

  As a result of various studies to achieve the above-mentioned object, the present inventors have found that silicon with respect to the total aliphatic unsaturated groups is formed on one side of each of the hard surface panel that is exposed to light and the flexible sheet on the back surface. Forming a cured film of an addition-curable silicone composition with an optimized atomic bond hydrogen atom (Si-H group) molar ratio, sandwiching solar cell strings between the cured films, and thermocompression bonding under vacuum Thus, it has been found that a solar cell module sealed with silicone can be obtained easily and easily, and the present invention has been made.

Therefore, this invention provides the manufacturing method of the following silicone sealing solar cell module.
[1]
(I) a step of forming a cured silicone film on one side of each of the hard front panel and the flexible back sheet;
(Ii) a step of forming a laminate by disposing the solar cell strings so as to be sandwiched between the silicone cured film surfaces of the front panel and the back sheet;
(Iii) Silicone curing a plurality of solar cell strings between the front panel and the back sheet, including the step of placing the laminate in a reduced-pressure space and pressing it while heating to seal the solar cell strings A method for producing a solar cell module by sealing with a film, wherein the cured silicone film formed on the front panel and the back sheet has (A) (A-1) aliphatic unsaturated groups bonded to silicon atoms, respectively. Organopolysiloxane having a viscosity of 100 to 100,000 mPa · s at 23 ° C. containing one or more in one molecule: 80 to 100 parts by mass
(A-2) Organic compound containing at least one aliphatic unsaturated group capable of hydrosilylation reaction with a hydrogen atom bonded to a silicon atom: 0 to 20 parts by mass,
(A-1) An amount in which the sum of the component + (A-2) component is 100 parts by mass,
(B) Organohydrogenpolysiloxane containing two or more hydrogen atoms bonded to silicon atoms in one molecule: (A-1) and (A-2) total number of moles of aliphatic unsaturated groups in the component ( When the ratio (b) / (a) of the number of moles of hydrogen atoms bonded to silicon atoms contained in this component relative to a) (b) / (a) is p, an amount satisfying 0.25 ≦ p <1.3,
(C) Hydrosilylation reaction catalyst selected from platinum group metal catalysts: cured film (X) of organopolysiloxane composition (I) containing an effective amount;
(D) (D-1) Organopolysiloxane containing at least one aliphatic unsaturated group bonded to a silicon atom in one molecule and having a viscosity at 23 ° C. of 100 to 100,000 mPa · s: 80 to 100 mass Part,
(D-2) Organic compound containing 1 or more aliphatic unsaturated groups capable of hydrosilylation reaction with hydrogen atoms bonded to silicon atoms: 0 to 20 parts by mass,
(D-1) An amount in which the sum of the component + (D-2) component is 100 parts by mass,
(E) Organohydrogenpolysiloxane containing two or more hydrogen atoms bonded to silicon atoms in one molecule: (D-1) and (D-2) total number of moles of aliphatic unsaturated groups in the component ( When the ratio (e) / (d) of the number of moles (e) of hydrogen atoms bonded to silicon atoms contained in this component to d) is q, an amount satisfying 0.3 <q ≦ 10,
(F) Hydrosilylation reaction catalyst selected from platinum group metal catalysts: cured film (Y) of organopolysiloxane composition (II) containing an effective amount, wherein the molar ratios p and q are | q− A method for producing a silicone-encapsulated solar cell module, which satisfies the relationship of p |> 0.7 and q / p ≧ 1.3.
[2]
In the step (i), the cured silicone film (X) is formed by leaving the outer peripheral portion on one side of the hard surface panel, and the cured silicone film (Y) is formed on the entire surface of the flexible back sheet, [1] The silicone sealing according to [1], wherein a silicone adhesive having a thickness equivalent to that of the silicone-forming film is disposed on a portion of the front panel where the silicone cured film is not formed, and then the steps (ii) and (iii) are performed. Manufacturing method of solar cell module.
[3]
The cured film (X) of the organopolysiloxane composition (I) is a silicone gel having a penetration of 20 to 200, and the cured film (Y) of the organopolysiloxane composition (II) is a durometer type A hardness. The method for producing a silicone-sealed solar cell module according to [1] or [2], which is a silicone rubber of 3 or more and 70 or less.
[4]
The thickness of the said silicone cured film is 200-1,000 micrometers, respectively, The manufacturing method of the silicone sealing solar cell module in any one of [1]-[3] characterized by the above-mentioned.
[5]
The silicone according to any one of [1] to [4], wherein the step (iii) is performed by heating the two hard panels and the solar cell strings to 70 to 150 ° C. under reduced pressure. Manufacturing method of sealing solar cell module.
[6]
Said (iii) process is performed with a vacuum laminator, The manufacturing method of the silicone sealing solar cell module in any one of [1]-[5] characterized by the above-mentioned.
[7]
The method for producing a silicone-encapsulated solar cell module according to any one of [1] to [6], wherein the hard panel on the surface is a white plate heat-tempered glass substrate or polycarbonate.
[8]
The method for producing a silicone-encapsulated solar cell module according to any one of [1] to [7], wherein the flexible back sheet is a solar cell backsheet.

  According to the present invention, a liquid material that is difficult to handle by pasting together a solar cell front panel and a back sheet coated with a cured silicone film having a total Si-H group / Si-Vi group value optimized. It is possible to seal the solar cell strings without using a gap and to provide adhesion reliability that can withstand a thermal shock test.

It is sectional drawing which shows the state after silicone coating film formation to the panel of the 1st form of this invention. It is sectional drawing which shows the module of the 1st form of this invention. It is sectional drawing which shows the state after silicone coating film formation to the panel of the 2nd form of this invention. It is sectional drawing which shows the module of the 2nd form of this invention.

The method for producing the silicone-sealed solar cell module of the present invention is as follows.
(I) forming a silicone cured film on one side of each of the front panel and the back sheet;
(Ii) a step of forming a laminate by disposing the solar cell strings so as to be sandwiched between the silicone cured film surfaces of the front panel and the back sheet;
(Iii) The step of disposing the laminate in a reduced pressure space and pressing it while heating to seal the solar cell strings.

In this case, the organopolysiloxane composition (I) that forms the cured silicone film (X) formed on one of the front and back panels and sheets, preferably on one side of the front panel,
(A) (A-1) Organopolysiloxane containing at least one aliphatic unsaturated group bonded to a silicon atom in one molecule and having a viscosity at 23 ° C. of 100 to 100,000 mPa · s: 80 to 100 mass Part,
(A-2) Organic compound containing at least one aliphatic unsaturated group capable of hydrosilylation reaction with a hydrogen atom bonded to a silicon atom: 0 to 20 parts by mass,
(A-1) An amount in which the sum of the component + (A-2) component is 100 parts by mass,
(B) Organohydrogenpolysiloxane containing two or more hydrogen atoms bonded to silicon atoms in one molecule: (A-1) and (A-2) total number of moles of aliphatic unsaturated groups in the component ( When the ratio (b) / (a) of the number of moles of hydrogen atoms bonded to silicon atoms contained in this component relative to a) (b) / (a) is p, an amount satisfying 0.25 ≦ p <1.3,
(C) Hydrosilylation reaction catalyst selected from platinum group metal catalysts: contains an effective amount, and will be described in more detail below.

[(A) component]
[(A-1) component]
The (A-1) component organopolysiloxane is the main component of this composition, and contains one or more, preferably 2 to 10 aliphatic unsaturated groups in one molecule. Examples of the aliphatic unsaturated group include an alkenyl group having 2 to 8 carbon atoms, preferably about 2 to 4 carbon atoms, such as a vinyl group, an allyl group, a butenyl group, a pentenyl group, a hexenyl group, and a heptenyl group. In particular, a vinyl group is preferable. The aliphatic unsaturated group bonded to the silicon atom in the component (A) is, for example, a molecular chain terminal group (an alkenyl group-containing triorganosiloxy group such as a diorganoalkenylsiloxy group, an organodialkenylsiloxy group, or a trialkenylsiloxy group). And / or molecular chain side groups (in the form of alkenyl group-containing diorganosiloxane units such as organoalkenylsiloxane units and dialkenylsiloxane units). In addition, the amount of the alkenyl group in the organopolysiloxane is preferably 0.003 to 0.02 mol / 100 g.

  (A-1) As an organic group couple | bonded with silicon atoms other than aliphatic unsaturated groups, such as an alkenyl group in a component, For example, an alkyl group, especially a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, An alkyl group having 1 to 10 carbon atoms such as a hexyl group, a cyclohexyl group and a heptyl group; an aryl group, particularly an aryl group having 6 to 14 carbon atoms such as a phenyl group, a tolyl group, a xylyl group and a naphthyl group; an aralkyl group, In particular, an aralkyl group having 7 to 14 carbon atoms such as a benzyl group and a phenethyl group; a halogenated alkyl group, particularly a chloromethyl group, a 3-chloropropyl group, a 3,3,3-trifluoropropyl group and the like having 1 carbon atom Although an unsubstituted or halogen-substituted monovalent hydrocarbon group such as a halogenated alkyl group of ˜3 can be mentioned, it is required that the weather resistance is high in this application, It is preferably a methyl group.

  Examples of the molecular structure of the component (A-1) include linear, partially branched linear, cyclic, branched, etc., and those that become silicone gels after curing are preferred. A linear diorganopolysiloxane in which the chain basically consists of repeating diorganosiloxane units and both ends of the molecular chain are blocked with triorganosiloxy groups is preferred.

  The viscosity at 23 ° C. of the component (A-1) is in the range of 100 to 100,000 mPa · s because the physical properties of the resulting silicone rubber are good and the handling workability of the composition is good. It is preferable that it is in the range of 500 to 10,000 mPa · s. The viscosity is a value measured by a rotational viscometer (hereinafter the same).

Examples of the organopolysiloxane of the component (A-1) include, for example, a trimethylsiloxy group-capped dimethylsiloxane / methylvinylsiloxane copolymer having both molecular chain terminals, a trimethylsiloxy group-capped methylvinylpolysiloxane having both molecular chain terminals, Trimethylsiloxy group-capped dimethylsiloxane / methylvinylsiloxane / diphenylsiloxane copolymer, both chain ends dimethylvinylsiloxy group-capped dimethylpolysiloxane, molecular chain both ends dimethylvinylsiloxy group-capped methylvinylpolysiloxane, both molecular chains Terminal dimethylvinylsiloxy group-blocked dimethylsiloxane / methylvinylsiloxane copolymer, molecular chain both ends dimethylvinylsiloxy group-blocked dimethylsiloxane / methylvinylsiloxane / diphenylsiloxane copolymer, Child-terminated divinyl trimethylsiloxy group-blocked dimethylpolysiloxane with both molecular chain terminals by trimethylsiloxy blocked with dimethylvinylsiloxy groups, wherein: the siloxane units of the formula R ¹ ₃ SiO _0.5 (R ¹ is as described below) : R ¹ ₂ R ² SiO _0.5 (R ² is as described later), a siloxane unit represented by the formula: R ¹ ₂ SiO and a small amount of organo: consisting of a siloxane unit represented by the formula: SiO ₂ Polysiloxane copolymer, an organopolysiloxane copolymer comprising a siloxane unit represented by the formula: R ¹ ₃ SiO _0.5 and a siloxane unit represented by the formula: R ¹ ₂ R ² SiO _0.5 and a siloxane unit represented by the formula: SiO ₂ A siloxane unit represented by the formula: R ¹ ₂ R ² SiO _0.5 and a siloxane unit represented by the formula: R ¹ ₂ SiO and a small amount of formula: SiO _An organopolysiloxane copolymer comprising a siloxane unit represented by ₂ , a siloxane unit represented by the formula: R ¹ R ² SiO and a small amount of a siloxane unit represented by the formula: R ¹ SiO _1.5 or a formula: R ² SiO _1.5 And an organopolysiloxane copolymer composed of siloxane units. These can be used singly or in combination of two or more.

R ¹ in the above formula is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 12 carbon atoms other than an alkenyl group. For example, methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group Alkyl groups such as heptyl group; aryl groups such as phenyl group, tolyl group, xylyl group and naphthyl group; aralkyl groups such as benzyl group and phenethyl group; chloromethyl group, 3-chloropropyl group, 3,3,3- Examples thereof include a halogenated alkyl group such as a trifluoropropyl group. R ² in the above formula is an alkenyl group, and examples thereof include a vinyl group, an allyl group, a butenyl group, a pentenyl group, a hexenyl group, and a heptenyl group.

[(A-2) component]
(A-2) In an organic compound containing one or more aliphatic unsaturated groups capable of hydrosilylation reaction with a hydrogen atom bonded to a silicon atom as a component, a hydrogen atom bonded to a silicon atom (Si-H Group) and an aliphatic unsaturated group capable of hydrosilylation include alkenyl groups such as vinyl, allyl, propenyl, isopropenyl, butenyl, isobutenyl, pentenyl, hexenyl, heptenyl, and acryloxy Group, methacryloxy group and the like.

The component (A-2) is preferably colorless and transparent even when mixed with the component (A-1) or the component (B) described later. As specific examples, triallyl isocyanurate, (meth) acrylic acid and esters thereof Having at least one aliphatic unsaturated group-containing hydrocarbon compound containing no silicon atom in the molecule or the above aliphatic unsaturated group in a molecule, preferably having a viscosity at 23 ° C. of less than 100 mPa · s, Usually, organosilicon compounds such as organosilanes and organo (poly) siloxanes (siloxane oligomers) of 0.01 to 50 mPa · s, more preferably 0.01 to 30 mPa · s, still more preferably about 0.1 to 10 mPa · s. Can be mentioned.
The degree of polymerization of this organo (poly) siloxane (siloxane oligomer) or the number of silicon atoms in the molecule is preferably 2 to 20, preferably 2 to 10, more preferably about 2 to 8.

  Specifically, the organosilicon compound has one or more alkenyl groups such as trimethylvinylsilane, trimethoxyvinylsilane, methoxydimethylvinylsilane, divinyldimethylsilane, allyltrimethylsilane, dimethyldivinylsilane, methyltrivinylsilane, diallyldimethylsilane and the like. Organoalkenylsilanes, 1,3-divinyl-1,1,3,3-tetramethyldisiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane, etc. And organo (poly) siloxane (or siloxane oligomer) having one or more alkenyl groups.

  Moreover, as a compounding ratio of the component (A-1) and the component (A-2), 80 parts by mass: 20 parts by mass to 100 parts by mass: 0 part by mass, preferably 90 parts by mass: 10 parts by mass to 100 parts by mass. : 0 parts by mass, more preferably 95 parts by mass: 5 parts by mass to 100 parts by mass: 0 parts by mass. This is because if the blending amount of the component (A-1) is less than 80 parts by mass, the weather resistance and rubber strength characteristics required as a silicone cured product are not maintained.

[Component (B)]
The (B) component organohydrogenpolysiloxane reacts with the (A-1) component and the (A-2) component and acts as a cross-linking agent. Various types such as linear, cyclic, branched, and three-dimensional network structures (resinous) can be used, but they are bonded to two or more, preferably three or more silicon atoms in one molecule. It is necessary to have a hydrogen atom (hydrosilyl group represented by Si—H), and it is desirable to have usually 3 to 500, preferably 3 to 200, more preferably about 3 to 100 Si—H groups. . As the organohydrogenpolysiloxane, those represented by the following average composition formula (1) are used.
R ³ _m H _n SiO _{(4-mn) / 2} (1)

In the above formula (1), R ³ is an unsubstituted or substituted monovalent carbon atom bonded to a silicon atom having usually 1 to 14 carbon atoms, preferably 1 to 10 carbon atoms, excluding an aliphatic unsaturated bond. Examples of the unsubstituted or substituted monovalent hydrocarbon group for R ^{3 as a} hydrogen group or an alkoxy group include, for example, a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a tert-butyl group, Alkyl groups such as pentyl group, neopentyl group, hexyl group, cyclohexyl group, octyl group, nonyl group, decyl group; aryl groups such as phenyl group, tolyl group, xylyl group, naphthyl group; benzyl group, phenylethyl group, phenylpropyl Aralkyl groups such as groups, etc., or some or all of hydrogen atoms of these groups are substituted with halogen atoms such as fluorine, bromine, chlorine or alkoxy groups Examples thereof include chloromethyl group, 3-chloropropyl group, bromoethyl group, 3,3,3-trifluoropropyl group, and alkoxy groups such as methoxy group, ethoxy group, and propoxy group. The unsubstituted or substituted monovalent hydrocarbon group for R ³ is preferably an alkyl group or an alkoxy group, more preferably a methyl group or a methoxy group. M is 0.7 to 2.1, n is 0.001 to 1.0, and m + n is a positive number satisfying 0.8 to 3.0. Preferably, m is 1.0 to 1.0. 2.0 and n are positive numbers satisfying 0.01 to 1.0 and m + n satisfying 1.5 to 2.5.

  Two or more, preferably three or more Si-H groups contained in one molecule may be located either at the molecular chain end or in the middle of the molecular chain, or may be located at both of them. Good. The molecular structure of the organohydrogenpolysiloxane may be any of linear, cyclic, branched, three-dimensional network structure, etc., but the number of silicon atoms in one molecule (or the degree of polymerization) is The viscosity is usually 2 to 1,000, preferably 3 to 300, more preferably about 4 to 150, and the viscosity at 23 ° C. is usually 0.1 to 5,000 mPa · s, preferably 0.5 to 1. The liquid is used at room temperature (23 ° C.) of about 1,000 mPa · s, more preferably about 5 to 500 mPa · s.

  The component (B) can be obtained by a known production method. General production methods include, for example, 1,3,5,7-tetramethyl-1,3,5,7-tetrahydrocyclotetrasiloxane (in some cases, the cyclotetrasiloxane and octamethylcyclotetrasiloxane). And a siloxane compound serving as a terminal group source such as hexamethyldisiloxane, 1,3-dihydro-1,1,3,3-tetramethyldisiloxane, or octamethylcyclotetrasiloxane and 1,3 Easy by equilibrating dihydro-1,1,3,3-tetramethyldisiloxane in the presence of a catalyst such as sulfuric acid, trifluoromethanesulfonic acid, methanesulfonic acid, etc. at a temperature of about −10 to + 40 ° C. Can get to.

  The compound of the formula (1) having a trialkoxysilyl group can be produced by a method of adding an alkenyl group-containing alkoxysilane to an organohydrogenpolysiloxane.

Component (B) can be used alone or in combination of two or more.
The blending amount of component (B) is the total number of moles of aliphatic unsaturated groups bonded to silicon atoms in component (A-1) and aliphatic unsaturated groups capable of hydrosilylation reaction in component (A-2). The ratio p [(b) / (a)] of the number of moles (b) of hydrogen atoms (Si—H groups) bonded to silicon atoms in the component (B) relative to (a) is 0.25 ≦ p <1. .3, preferably 0.5 to 1.2, and more preferably 0.5 to 0.8. If the blending amount of component (B) or the value of p is too small, the composition may not be cured sufficiently, and conversely if too large, the adhesion between the cured products of the resulting composition may be extremely poor. .

  The component (C) is a curing catalyst that promotes the reaction with the components (A) to (B), and is preferably an effective amount of a platinum group metal catalyst.

As this platinum group metal catalyst, any known hydrosilylation catalyst can be used. For example, platinum group metals such as platinum black, rhodium and palladium; H ₂ PtCl ₄ · dH ₂ O, H ₂ PtCl ₆ · dH ₂ O, NaHPtCl ₆ · dH ₂ O, KHPtCl ₆ · dH ₂ O, Na ₂ PtCl ₆ · dH ₂ O, K ₂ PtCl ₄ · dH ₂ O, PtCl ₄ · dH ₂ O, PtCl ₂ , Na ₂ HPtCl ₄ · dH ₂ O (wherein d is an integer of 0 to 6, preferably 0) Or chloroplatinic acid and chloroplatinate; alcohol-modified chloroplatinic acid (see US Pat. No. 3,220,972); complex of chloroplatinic acid and olefin (US patent) 3,159,601 specification, 3,159,662 specification, 3,775,452 specification); platinum group metals such as platinum black, palladium, etc., alumina, silica, carbon, etc. Supported on the carrier Rhodium-olefin complex; Chlorotris (triphenylphosphine) rhodium (Wilkinson catalyst); Platinum chloride, chloroplatinic acid or chloroplatinate and vinyl group-containing siloxane, especially vinyl group-containing cyclic siloxane Can be mentioned. Among these, preferred are those obtained by modifying chloroplatinic acid with silicone from the viewpoint of compatibility and chlorine impurities. Specifically, for example, platinum obtained by modifying chloroplatinic acid with tetramethylvinyldisiloxane. A catalyst is mentioned.

  The addition amount of the curing catalyst may be a catalytic amount, but it is preferably 1 to 500 ppm, more preferably 3 to 100 ppm in terms of mass in the total of the components (A) to (D) as platinum group metal atoms. More preferably, it is 10 to 40 ppm. If the amount is too small, the addition reaction may be remarkably slow or may not be cured, while if too large, the cost may be disadvantageous.

  Here, it is preferable that the organopolysiloxane composition (I) is cured to form a silicone gel. In the measurement method according to the JIS K2220 (1/4 cone) consistency test method, the penetration is 20 to 200, particularly The thing of 30-80 is preferable. If the penetration is larger than 200, the shape of the cured siloxane formed on the panel may be broken.

Next, the organopolysiloxane composition (II) that forms the cured silicone film (Y) formed on the other panel, preferably one side of the back sheet,
(D) (D-1) Organopolysiloxane containing at least one aliphatic unsaturated group bonded to a silicon atom in one molecule and having a viscosity at 23 ° C. of 100 to 100,000 mPa · s: 80 to 100 mass Part,
(D-2) Organic compound containing 1 or more aliphatic unsaturated groups capable of hydrosilylation reaction with hydrogen atoms bonded to silicon atoms: 0 to 20 parts by mass,
(D-1) An amount in which the sum of the component + (D-2) component is 100 parts by mass,
(E) Organohydrogenpolysiloxane containing two or more hydrogen atoms bonded to silicon atoms in one molecule: (D-1) and (D-2) total number of moles of aliphatic unsaturated groups in the component ( When the ratio (e) / (d) of the number of moles (e) of hydrogen atoms (Si—H groups) bonded to silicon atoms contained in this component to d) is q, 0.3 <q ≦ 10 The amount,
(F) Hydrosilylation reaction catalyst selected from platinum group metal catalysts: It contains an effective amount.

[(D) component]
[(D-1) component]
Examples of the organopolysiloxane of component (D-1) can be the same as those of component (A-1), and linear ones are particularly preferred. In this case, the component (D-1) and the component (A-1) may be the same or different, and the viscosity at 23 ° C. is 100 to 100,000 mPa · s, particularly 500 to 10,000 mPa · s. s is preferred. Moreover, it is preferable that the amount of alkenyl groups of this organopolysiloxane is 0.005-0.02 mol / 100g.

Further, as the organopolysiloxane of component (D-1), a resinous copolymer comprising R ₃ SiO _1/2 units and SiO ₂ units, and containing a small amount of R ₂ SiO units and RSiO _3/2 units as necessary. Can also be used.
Here, R is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 12 carbon atoms, and examples thereof include an alkyl group, an alkenyl group, an aryl group, an aralkyl group, a halogenated alkyl group, and the like. Are the same as those described for the component (A-1), but in one molecule of the resin copolymer, it is preferable to have at least one, particularly at least two alkenyl groups, and in one molecule. The amount of the alkenyl group is preferably 0.02 to 0.15 mol / 100 g, more preferably 0.05 to 0.1 mol / 100 g.

The molar ratio of the R ₃ SiO _1/2 unit to the SiO ₂ unit is preferably 0.5 to 2, particularly 0.7 to 1.5. Moreover, when it contains R2SiO unit and RSiO3 _{/ 2} unit, it is preferable that these content is 30 mol% or less of the whole resin copolymer, and especially 10 mol% or less in total.

  When the linear organopolysiloxane and the resin copolymer are used in combination, the combined ratio is 100: 0 to 50:50, particularly 100: 0 to 70:30 as a mass ratio, and the resin copolymer Is preferably 90:10 to 70:30, particularly 90:10 to 80:20 as a whole. Further, the total amount of the alkenyl group is preferably 0.005 to 0.045 mol / 100 g, particularly preferably 0.010 to 0.030 mol / 100 g.

[(D-2) component]
(D-2) The organopolysiloxane of a component can illustrate the same thing as (A-2) component. Also in this case, the component (D-2) and the component (A-2) may be the same or different. In addition, when using organo (poly) siloxane (siloxane oligomer) as the component (D-2), the viscosity at 23 ° C. is less than 100 mPa · s, usually 0.01 to 50 mPa · s, more preferably 0.01 to 30 mPa · s. s, more preferably about 0.1 to 10 mPa · s.

  Moreover, as a compounding ratio of the component (D-1) and the component (D-2), 80 parts by mass: 20 parts by mass to 100 parts by mass: 0 part by mass, preferably 90 parts by mass: 10 parts by mass to 100 parts by mass. : 0 parts by mass, more preferably 95 parts by mass: 5 parts by mass to 100 parts by mass: 0 parts by mass. This is because if the blending amount of the component (D-1) is less than 80 parts by mass, the weather resistance and rubber strength characteristics required as a silicone cured product are not maintained.

  The (E) component organohydrogenpolysiloxane is exemplified by the same component as the (B) component, but in addition, in order to impart adhesion to the panel of the organopolysiloxane composition (II), a phenyl group And a triorganosiloxy group having a γ- (meth) acryloxypropyl group, a γ-glycidoxypropyl group, and an organohydrogenpolysiloxane having a diorganosiloxane unit in the molecule.

  The blending amount of the component (E) is the total number of moles of the aliphatic unsaturated group bonded to the silicon atom in the component (D-1) and the aliphatic unsaturated group capable of hydrosilylation in the component (D-2). When the ratio of the number of moles (e) of hydrogen atoms (Si—H groups) bonded to silicon atoms in the organohydrogenpolysiloxane to (d) is q [(e) / (d)], 0.3 <Q ≦ 10, preferably 0.5 <q ≦ 10, more preferably 0.8 ≦ q ≦ 5, and even more preferably 1.1 ≦ q ≦ 3. If the blending amount of component (E) or the value of q is too small, crosslinking may be insufficient and sufficient rubber strength may not be obtained, or the adhesiveness between cured products of the composition may be extremely inferior. If it is too much, it may be disadvantageous in terms of cost.

  Examples of the catalyst for hydrosilylation reaction of component (F) can be the same as those of component (C). In this case, the component (F) and the component (C) may be the same or different.

  Here, the organopolysiloxane composition (II) preferably has a durometer type A hardness of 3 to 70, more preferably 5 to 40, still more preferably 10 to 30 in the measurement method according to JIS K6249 after curing. If the hardness is lower than 3, the impact of the finished solar cell is weak and the cell may be cracked by external force. If the hardness is higher than 70, the cured siloxane gives stress to the solar cell at the time of bonding. May break.

  In the silicone laminate of the present invention, the silicon atom-bonded hydrogen atom (Si—H) in the component (B) relative to the total aliphatic unsaturated groups in the component (A) in the organopolysiloxane composition (I) described above. Group) molar ratio p and the molar ratio of silicon atom-bonded hydrogen atoms (Si-H groups) in component (E) to total aliphatic unsaturated groups in component (D) in organopolysiloxane composition (II) q is defined as | q−p |> 0.7 and q / p ≧ 1.3, whereby the cured product of the organopolysiloxane composition (I) and the organopolysiloxane composition (II ) Can be adhered well at the interface. In this case, more preferably, | q−p |> 1, q / p ≧ 1.5. Further, when the value of | q−p | is 0.7 or less or when q / p is less than 1.3, the adhesion between the cured products may be deteriorated, and as a result, moisture from the contact interface between the two may be deteriorated. There is a possibility that the solar battery cells may deteriorate due to the intrusion. The upper limit of q / p is not particularly limited, but is usually q / p ≦ 40, particularly q / p ≦ 10.

[Other ingredients]
In the organopolysiloxane compositions (I) and (II) of the present invention, optional components other than those described above can be added. For example, fumed silica, crystalline silica, precipitated silica, hollow filler, silsesquioxane, fumed titanium dioxide, magnesium oxide, zinc oxide, iron oxide, aluminum hydroxide, alumina, magnesium carbonate, calcium carbonate, zinc carbonate, Surface treatment of inorganic fillers such as layered mica, carbon black, diatomaceous earth, and glass fibers, and organosilicon compounds such as organoalkoxysilane compounds, organochlorosilane compounds, organosilazane compounds, and low molecular weight siloxane compounds. A filler is mentioned. Examples of the filler include silicone rubber powder and silicone resin powder.

  Furthermore, in the organopolysiloxane compositions (I) and (II), as long as the object of the present invention is not impaired, as other optional components, for example, an organo group containing no silicon-bonded hydrogen atom and alkenyl group. A polysiloxane, an organic solvent, a heat resistance imparting agent, a flame retardancy imparting agent, a plasticizer, a thixotropic property imparting agent, a pigment, a dye, an antifungal agent and the like can be blended.

  The organopolysiloxane compositions (I) and (II) used in the present invention are the above components (A) to (C) and (D) to (F) (when optional components are blended, optional components are also included) Composition) can be prepared according to a conventional method. The composition thus obtained can be used after being diluted with an organic solvent such as toluene, xylene, benzene, or cyclic siloxane as necessary.

[Step i: Step of forming a cured silicone film on a hard surface panel and a flexible back sheet]
The organopolysiloxane composition obtained as described above was applied over the entire surface to a transparent member panel on which sunlight was incident and a flexible back sheet opposite to the incident direction of sunlight. And cured to form a cured silicone film.
In this case, the composition (I) is applied to a front panel on which sunlight is incident and cured to form a cured silicone film (X) made of silicone gel, and the composition is formed on the back sheet opposite to the incident direction of sunlight. It is recommended that the product (II) is applied and cured to form a cured silicone film (Y) made of silicone rubber.
FIG. 1 illustrates this step i. The composition (I) is applied to the front panel 1 and cured to form a cured film (X), and the composition (II) is formed on the back sheet 2. Is applied and cured to form a cured film (Y).

  As a method for applying the composition, there are a spray coating method, a curtain coating method, a knife coating method, a screen coating method, and the like, and any of these methods may be used.

  At this time, the coating amount is preferably adjusted so that the film thickness as a cured silicone film after curing is 200 to 1,000 μm, and more preferably in the range of 300 to 800 μm. If the film thickness is less than 200 μm, the solar cell element may be cracked in the step of sandwiching and pressing the solar cell element string made of the semiconductor substrate between the panels. On the other hand, if the film thickness is thicker than 1,000 μm, the amount of silicone used increases and the cost increases.

  Here, for the curing of the organopolysiloxane compositions (I) and (II), a known heating apparatus or apparatus such as a hot plate or an oven is used. The conditions are not particularly limited, and the addition reaction curable organopolysiloxane composition can be cured under known conditions, preferably 70 to 150 ° C., particularly preferably 80 to 120 ° C. It can be cured under conditions of about 4 minutes, especially about 20 minutes to 1 hour.

[Sunlight incident side panel (surface panel)]
As the panel on which sunlight is incident, inorganic glass such as blue plate glass, white plate glass, or tempered glass is used. In addition, acrylic resin, polycarbonate (PC) resin, polyethylene terephthalate (PET) resin are used as synthetic resin materials. Or organic glass, such as an epoxy resin, can also be used. In general, white plate heat-tempered glass or polycarbonate having a thickness of about 3 mm having high transparency and weather resistance is used.

[Sheet opposite to sunlight (back sheet)]
For crystalline silicon solar cell modules, resin backsheets are generally used in addition to the glass on the surface to achieve both high productivity in the vacuum lamination process of the module and long-term reliability of the module itself. . The back sheet needs to protect solar cells and wiring from outdoor environmental stresses for a long period of time, and specifically, high temperature / low temperature, humidity, ultraviolet rays, electrical insulation, and water vapor barrier properties are required. Since it is difficult to satisfy these requirements with a single resin film or metal foil, it is usually designed as a laminate in which two or three resin films are dry-laminated with an adhesive. As a typical backsheet structure, 1) PVF (polyvinyl fluoride) / adhesive / PET / adhesive / PVF (conventional abbreviation TPT), 2) PVF / adhesive / PET / adhesive / EVA (conventional abbreviation TPE) 3) Weather resistant PET / adhesive / olefin (or EVA).

[Step i ′]
Here, in the step i, when the composition (I) is applied to one side of the hard panel on the surface, the composition (I) is applied except for the outer peripheral edge of the surface panel 1 as shown in FIG. And cure. In this state, the silicone adhesive 4 is disposed on the outer peripheral edge of the hard panel where the composition (I) is not applied and therefore the cured silicone film (X) is not formed.
As a silicone adhesive, what adhere | attaches with hardened | cured panel and the silicone hardened | cured material (II) on a back surface sheet by hardening can be used.
Commercially available products can be used as this adhesive, for example, the polymer shape (HR-2388S-10100) manufactured by Shin-Etsu Polymer Co., Ltd., which has been processed into a tape shape in advance, or the applied shape is broken even when applied to the panel with high thixo. No KER-2000-DAM (manufactured by Shin-Etsu Chemical Co., Ltd.).
In addition, when arrange | positioning the silicone adhesive processed into tape shape, it is preferable to set it as thickness equivalent to a silicone cured film (X).

[Step ii]
Step ii is a step of forming a laminate by disposing the solar cell strings so as to be sandwiched between the hardened silicone films of the two hard panels on the front and back surfaces.
Here, the solar battery cell is formed by using one or two kinds of silicon semiconductors selected from general single crystal silicon or polycrystalline silicon. Here, the solar battery cell string is the above-described solar battery. One example is a cell in which cells are connected by tab lines to form a combined cell.

[Step iii]
Step iii is a step in which the laminate is placed in a reduced pressure space and pressed while being heated to seal the solar cell strings with the cured silicone films (X) and (Y).
FIG. 2 shows a solar cell module when step i is employed. In the figure, 3 is a solar cell string.
On the other hand, FIG. 4 shows a solar cell module when step i ′ is employed. In the module of FIG. 4, the solar cell strings are sealed with the silicone cured films (X) and (Y), and are sealed with the silicone adhesive 4 at the outer peripheral edge.
Here, when arrange | positioning a laminated body in decompression space, the decompression degree in particular is although it does not restrict | limit, It is preferable that it is -0.08--0.10 MPa. Moreover, although heating and pressing conditions are also selected as appropriate, in heating at 70 to 150 ° C., particularly 100 to 130 ° C., it is preferable to press at atmospheric pressure for about 5 to 15 minutes after vacuum decompression for 3 to 5 minutes.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example.

[Preparation of organopolysiloxane]
[Example 1]
[Organopolysiloxane (I)]
To 100 parts by mass of dimethylpolysiloxane having both molecular chain ends blocked with vinyldimethylsiloxy groups, a viscosity at 23 ° C. of 1,000 mPa · s, and a vinyl group (Vi) content of 0.012 mol / 100 g, 0.05 part by mass of a dimethylpolysiloxane solution of vinyl chloroplatinate complex containing 1% by mass of platinum atom, 1,3,5,7-tetramethyl-1,3,5,7-tetra as an addition reaction control agent After adding 0.1 parts by weight of vinyltetrasiloxane and mixing uniformly, 1.2 parts by weight of methyl hydrogen polysiloxane having a Si—H group in the side chain (Si—H amount: 0.0055 mol / g) was added, The preparation liquid was prepared (total Si—H / Si—Vi (p) = 0.5). This prepared solution is applied to a white plate heat-strengthened glass of 600 mm x 1,600 mm and a thickness of 3.2 mm with a masking tape of 10 mm in circumference, then applied to a thickness of 500 μm, and heated and cured at 120 ° C. for 10 minutes. A silicone coating film was obtained and used as a surface panel. The cured silicone film had a penetration of 50.

[Organopolysiloxane (II)]
131 parts by mass of dimethylpolysiloxane having both molecular chain ends blocked with vinyldimethylsiloxy groups, a viscosity at 23 ° C. of 5,000 mPa · s, and a vinyl group (Vi) content of 0.006 mol / 100 g, A resinous copolymer comprising [CH ₃ ) ₃ SiO _1/2 units, (CH ₂ ═CH) (CH ₃ ) ₂ SiO _1/2 units and SiO ₂ units [[(CH ₃ ) ₃ SiO _1/2 units and (Total of (CH ₂ = CH) (CH ₃ ) ₂ SiO _1/2 unit] / SiO ₂ unit = 0.8 (molar ratio), vinyl group content = 0.085 mol / g] 50 parts by mass, platinum atom Dimethylpolysiloxane solution of chloroplatinic acid vinylsiloxane complex containing 1% by mass as a compound, 0.3 parts by mass of triallyl isocyanurate, 0.05 parts by mass of a reaction control agent ethynylcyclohexanol, 2) 25 parts by mass of the organohydrogensiloxane represented by the formula, 4.0 parts by mass of the organohydrogensiloxane represented by the following chemical formula (3), and a compound represented by the following chemical formula (4) (KAYARAD manufactured by Nippon Kayaku Co., Ltd.) R604) 0.5 part by mass was uniformly mixed (total Si—H / Si—Vi (q) = 2.0). A back sheet of 600 mm × 1,600 mm and a thickness of 350 μm (manufactured by M Package, PTD250) is coated to a thickness of 300 μm and cured by heating at 120 ° C. for 15 minutes to obtain a silicone coating film, which is used as a back panel. . The cured silicone film had a durometer type A20 hardness.

[modularization]
First, the masking tape on the front panel is removed, and a tape-shaped silicone adhesive (Shin-Etsu Polymer Co., Ltd .: HR-2388S) with a width of 10 mm and a thickness of 1 mm is placed around the surface panel (the part where no silicone is placed). did. Next, cell strings in which 36 cells of solar cells were connected were placed on the cured silicone surface of the back panel, and then a laminate was prepared so that the silicone surface of the front panel was in contact with the cells. This laminated body was put into a vacuum laminator tank, pressed at 70 ° C. for 3 minutes (−0.7 MPa or less), and then pressed for 15 minutes.

[Evaluation method]
After the silicone cured products (I) and (II) were brought into close contact with each other and bonded at normal pressure, the adhesive test was performed after heating at 120 ° C. for 30 minutes. Moreover, after modularization by a vacuum laminator, it was visually confirmed whether the solar cell strings were completely sealed with a silicone coating film. Further, the finished module was pressed from the back with a 5 mmφ rod (about 1 kg weight) to evaluate whether the cell was cracked. Further, the handling properties of the back sheet (back sheet) and the silicone integral molded product were evaluated together.

[Example 2]
[Organopolysiloxane (I)]
It was produced in the same manner as (I) of Example 1.
[Organopolysiloxane (II)]
40 parts by mass of crystalline silica ZA-30 (manufactured by Tatsumori) was added to 100 parts by mass of (II) in Example 1. This was cured at 120 ° C. for 30 minutes and used as a back panel. The hardness at this time was 40 for durometer type A.
Using these, modularization was performed in the same manner as in Example 1 for evaluation.

[Example 3]
[Organopolysiloxane (I)]
To 100 parts by mass of dimethylpolysiloxane having both molecular chain ends blocked with vinyldimethylsiloxy groups, a viscosity at 23 ° C. of 1,000 mPa · s, and a vinyl group (Vi) content of 0.012 mol / 100 g, 0.05 part by mass of a dimethylpolysiloxane solution of vinyl chloroplatinate complex containing 1% by mass of platinum atom, 1,3,5,7-tetramethyl-1,3,5,7-tetra as an addition reaction control agent After adding 0.1 parts by weight of vinyltetrasiloxane and mixing uniformly, 1.9 parts by weight of methyl hydrogen polysiloxane having a Si—H group in the side chain (Si—H amount: 0.0055 mol / g) was added, The preparation liquid was prepared (total Si—H / Si—Vi (p) = 0.8). This prepared solution is applied to a white tempered glass with a thickness of 340mm x 360mm and a thickness of 3.2mm with a masking tape around 10mm, then applied to a thickness of 500μm, and cured by heating at 120 ° C for 10 minutes to apply silicone. A film was obtained and used as a surface panel. The cured silicone film had a penetration of 30.
[Organopolysiloxane (II)]
It was produced in the same manner as (II) in Example 1.
Using these, modularization was performed in the same manner as in Example 1 for evaluation.

[Comparative Example 1]
[Organopolysiloxane (I)]
It was produced in the same manner as (I) of Example 1.
[Organopolysiloxane (II)]
147 parts by mass of dimethylpolysiloxane having both molecular chain ends blocked with vinyldimethylsiloxy groups, a viscosity at 23 ° C. of 1,000 mPa · s, and a vinyl group (Vi) content of 0.012 mol / 100 g, 92 parts by mass of dimethylpolysiloxane having a chain end blocked with a vinyldimethylsiloxy group, a viscosity at 23 ° C. of 800 mPa · s, and a vinyl group (Vi) content of 0.004 mol / 100 g, 1 platinum atom 0.06 parts by mass of a dimethylpolysiloxane solution of a vinyl chloroplatinic acid complex containing 1% by mass, 0.01 part by mass of 1,3,5,7-tetramethyl-1,3,5,7-tetravinyltetrasiloxane, Organohydrogen having Si—H groups only at both ends of the molecular chain (Si—H amount: 0.013 mol / g) 21 parts by mass of Loxane, 0.5 parts by mass of methyl hydrogen polysiloxane having a Si—H group in the side chain (Si—H amount: 0.0055 mol / g) were added, and the prepared solution was prepared (total Si—H / Si -Vi (q) = 1.3). This cured product was a silicone gel with a penetration of 107.
Using these, modularization was performed in the same manner as in Example 1 for evaluation.

[Comparative Example 2]
[Organopolysiloxane (I)]
It was produced in the same manner as (I) of Example 1.
[Organopolysiloxane (II)]
131 parts by mass of dimethylpolysiloxane having both molecular chain ends blocked with vinyldimethylsiloxy groups, a viscosity at 23 ° C. of 5,000 mPa · s, and a vinyl group (Vi) content of 0.006 mol / 100 g, A resinous copolymer comprising [CH ₃ ) ₃ SiO _1/2 units, (CH ₂ ═CH) (CH ₃ ) ₂ SiO _1/2 units and SiO ₂ units [[(CH ₃ ) ₃ SiO _1/2 units and (Total of (CH ₂ = CH) (CH ₃ ) ₂ SiO _1/2 unit] / SiO ₂ unit = 0.8 (molar ratio), vinyl group content = 0.085 mol / g] 50 parts by mass, platinum atom Dimethylpolysiloxane solution of chloroplatinic acid vinylsiloxane complex containing 1% by mass as a compound, 0.3 part by mass of triallyl isocyanurate, 0.05 part by mass of a reaction control agent ethinylcyclohexanol, the above chemical formula 2) 12 parts by mass of the organohydrogensiloxane represented by the formula (2), 2.5 parts by mass of the organohydrogensiloxane represented by the above chemical formula (3), and a compound represented by the above chemical formula (4) (Kayadar, manufactured by Nippon Kayaku Co., Ltd.) R604) 0.5 part by mass was uniformly mixed (total Si—H / Si—Vi (q) = 1.0). When this composition was heat-cured at 120 ° C. for 15 minutes, the hardness was durometer type A20.
Using these, modularization was performed in the same manner as in Example 1 for evaluation.

[Comparative Example 3]
[Organopolysiloxane (I)]
It was produced in the same manner as (I) of Example 1.
[Organopolysiloxane (II)]
It was produced in the same manner as (II) in Example 1.
This prepared solution is applied to a white plate heat-strengthened glass of 600 mm x 1,600 mm and a thickness of 3.2 mm with a masking tape of 10 mm in circumference, then applied to a thickness of 500 μm, and heated and cured at 120 ° C. for 10 minutes. A silicone coating film was obtained and used as a back panel. In the same manner as in Examples 1 to 3 and Comparative Examples 1 and 2, modularization was performed by placing a silicone adhesive on the outer periphery of the front panel, forming a laminate with the cell strings and the back panel, and then vacuum laminating.

The results are shown in Table 1.

1: Front panel (sunlight incident side)
2: Back sheet (on the side opposite to the sunlight incident side)
3: Solar cell string 4: Tape-like silicone adhesive X: Cured film of organopolysiloxane composition (I) Y: Cured film of organopolysiloxane composition (II)

Claims (8)

(I) a step of forming a cured silicone film on one side of each of the hard front panel and the flexible back sheet;
(Ii) a step of forming a laminate by disposing the solar cell strings so as to be sandwiched between the silicone cured film surfaces of the front panel and the back sheet;
(Iii) Silicone curing a plurality of solar cell strings between the front panel and the back sheet, including the step of placing the laminate in a reduced-pressure space and pressing it while heating to seal the solar cell strings A method for producing a solar cell module by sealing with a film, wherein the cured silicone film formed on the front panel and the back sheet has (A) (A-1) aliphatic unsaturated groups bonded to silicon atoms, respectively. Organopolysiloxane having a viscosity of 100 to 100,000 mPa · s at 23 ° C. containing one or more in one molecule: 80 to 100 parts by mass
(A-2) Organic compound containing at least one aliphatic unsaturated group capable of hydrosilylation reaction with a hydrogen atom bonded to a silicon atom: 0 to 20 parts by mass,
(A-1) An amount in which the sum of the component + (A-2) component is 100 parts by mass,
(B) Organohydrogenpolysiloxane containing two or more hydrogen atoms bonded to silicon atoms in one molecule: (A-1) and (A-2) total number of moles of aliphatic unsaturated groups in the component ( When the ratio (b) / (a) of the number of moles of hydrogen atoms bonded to silicon atoms contained in this component relative to a) (b) / (a) is p, an amount satisfying 0.25 ≦ p <1.3,
(C) Hydrosilylation reaction catalyst selected from platinum group metal catalysts: cured film (X) of organopolysiloxane composition (I) containing an effective amount;
(D) (D-1) Organopolysiloxane containing at least one aliphatic unsaturated group bonded to a silicon atom in one molecule and having a viscosity at 23 ° C. of 100 to 100,000 mPa · s: 80 to 100 mass Part,
(D-2) Organic compound containing 1 or more aliphatic unsaturated groups capable of hydrosilylation reaction with hydrogen atoms bonded to silicon atoms: 0 to 20 parts by mass,
(D-1) An amount in which the sum of the component + (D-2) component is 100 parts by mass,
(E) Organohydrogenpolysiloxane containing two or more hydrogen atoms bonded to silicon atoms in one molecule: (D-1) and (D-2) total number of moles of aliphatic unsaturated groups in the component ( When the ratio (e) / (d) of the number of moles (e) of hydrogen atoms bonded to silicon atoms contained in this component to d) is q, an amount satisfying 0.3 <q ≦ 10,
(F) Hydrosilylation reaction catalyst selected from platinum group metal catalysts: cured film (Y) of organopolysiloxane composition (II) containing an effective amount, wherein the molar ratios p and q are | q− A method for producing a silicone-encapsulated solar cell module, which satisfies the relationship of p |> 0.7 and q / p ≧ 1.3.   In the step (i), the cured silicone film (X) is formed by leaving the outer peripheral portion on one side of the hard surface panel, and the cured silicone film (Y) is formed on the entire surface of the flexible back sheet, 2. The silicone sealing according to claim 1, wherein a silicone adhesive having a thickness equivalent to that of the silicone-forming film is disposed on a portion of the front panel where the silicone cured film is not formed, and then the steps (ii) and (iii) are performed. Manufacturing method of solar cell module.   The cured film (X) of the organopolysiloxane composition (I) is a silicone gel having a penetration of 20 to 200, and the cured film (Y) of the organopolysiloxane composition (II) is a durometer type A hardness. The method for producing a silicone-sealed solar cell module according to claim 1 or 2, wherein the silicone rubber is 3 or more and 70 or less.   The method for producing a silicone-sealed solar cell module according to any one of claims 1 to 3, wherein the cured silicone film has a thickness of 200 to 1,000 µm. 5. The silicone according to claim 1, wherein the step (iii) is performed by heating the two hard panels and the solar cell strings to 70 to 150 ° C. under reduced pressure. Manufacturing method of sealing solar cell module.   The said (iii) process is performed with a vacuum laminator, The manufacturing method of the silicone sealing solar cell module of any one of Claims 1-5 characterized by the above-mentioned.   The method for producing a silicone-encapsulated solar cell module according to any one of claims 1 to 6, wherein the hard panel on the surface is a white plate heat strengthened glass substrate or polycarbonate.   The method for producing a silicone-sealed solar cell module according to any one of claims 1 to 7, wherein the flexible back sheet is a solar cell backsheet.