JP2019110327A - Solar cell module and manufacturing method of the same - Google Patents

Abstract

To provide a solar cell module excellent in flame retardancy, and a manufacturing method of the same.SOLUTION: A solar cell module having a light transmitting substrate 101 or a light transmitting film on the light receiving surface side, and not having a light transmitting substrate or a light transmitting film, or a back surface protective material on the back surface side has a structure in which silicone is at least partially used as a sealing material 103 between the light transmitting substrate 101 or the light transmitting film on light receiving surface side and a power generation element 104, and silicone is at least partially used as a sealing material 102 on the back surface side of the power generation element 104.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a flame retardant solar cell module and a method of manufacturing the same.

  In general, a solar cell module has a light transmitting substrate such as glass or polycarbonate on the light receiving surface side, and a back surface protective material such as a light transmitting substrate similar to the light receiving surface on the back surface side or a PET film EVA (ethylene-vinyl acetate copolymer, polyolefin, ionomer, etc.) is used as the sealing material.

  Since these sealing materials are flammable resins, the reduction of combustibility is an issue. In particular, when used for a residential roof, the flame caused by the splinter causes the light transmitting substrate on the light receiving surface side, for example, glass, to crack, and the solar cell module continues to burn by igniting an encapsulant such as EVA. The phenomenon occurs.

  In addition, if the solar cell module continues to burn, the back sheet is mainly made of PET, so combustion can not be stopped, combustion holes are generated in the back sheet, and fragments of glass and cells fall to the bottom There is.

  When installing a solar cell module on the roof of a house, it is necessary to pass a test based on laws and regulations on fire protection, and the flame caused by the above-mentioned sparks causes the solar cell module to penetrate and spread, resulting in burnables, glass, and power generating elements It may not reach the passing of this test that the fragments etc. of it fall to the lower part.

  In addition, when a light transmitting film is used on the light receiving surface side and the back surface side as seen in a flexible thin film solar cell, the light transmitting film spreads fire and fire holes are generated by the flame due to the spark. In the case where the sealing material such as EVA is ignited, the solar cell module continues to burn, and finally, a phenomenon in which the combustion material falls to the lower part occurs.

As a measure for solving such a problem, there is a method of adding a chlorine-based or red phosphorus-based flame-retardant material to the cell back side sealing material of a solar cell (Patent Document 1).
In addition, a method of adding a flame retardant such as intomescent ammonium phosphate which suppresses combustion by heat insulation to a sealing material (Patent Document 2), or a sealing material such as nano clay, hydrous magnesium silicate, calcium carbonate, etc. Methods of adding nanoparticles and the like have been disclosed (Patent Document 3).

The method of adding chlorine and red phosphorus to the sealing material in Patent Document 1 is not preferable because dioxins may be generated at the time of combustion.
In the method of adding a flame retardant such as intomescent ammonium phosphate as described in Patent Document 2 to the encapsulant, the particle size of the intomescent material is large, and it is transmitted when it is added to the encapsulant It has the disadvantage of reducing the rate.
The method of adding nanoparticles such as nanoclay, hydrous magnesium silicate, calcium carbonate and the like in Patent Document 3 may impair the permeability of the encapsulant unless the dispersion state of the particles is properly controlled.

JP-A-9-27633 Unexamined-Japanese-Patent No. 2007-335853 JP, 2011-134986, A

  The present invention has been made to solve the above-mentioned problems, and provides a solar cell module which is easy in a solar cell module process, can obtain good laminate sealing, and is excellent in flame retardancy, and a method of manufacturing the same. With the goal.

  As a result of intensive studies to achieve the above object, the present inventors have found that it is effective to apply silicone to a part of a solar cell module sealing material.

  As a solar cell sealing material, although EVA, polyolefin, an ionomer, etc. are generally used, it is possible to improve a flame retardance by partially applying silicone to such resin. The structure may be a laminate of EVA, polyolefin, ionomer, etc. and silicone, or may be a structure in which only silicone is applied to the sealing material.

Accordingly, the present invention provides the following solar cell module and a method of manufacturing the same.
1. A solar cell module having a light transmitting substrate or a light transmitting film on the light receiving surface side and having no light transmitting substrate or light transmitting film or back surface protective material on the back surface side, the light receiving surface side light transmitting substrate Alternatively, a structure in which silicone is at least partially used as a sealing material between the light transmitting film and the power generation element, and a structure in which silicone is at least partially used as a sealing material on the back surface side of the power generation element The solar cell module characterized by being.
2. A solar cell module having a light transmitting substrate or a light transmitting film on the light receiving surface side and having no light transmitting substrate or light transmitting film or back surface protective material on the back surface side, the light receiving surface side light transmitting substrate Alternatively, a solar cell module having a structure in which at least a part of silicone is used as a sealing material between the light transmitting film and the power generation element.
3. A solar cell module having a light transmitting substrate or a light transmitting film on the light receiving surface side and having no light transmitting substrate or light transmitting film or back surface protection material on the back surface side, and sealing the back surface side of the power generation element A solar cell module having a structure in which silicone is at least partially used as a stopper.
4. The thickness of a silicone is 0.05-3 mm, The solar cell module in any one of said 1-3 characterized by the above-mentioned.
5. Silicone is
(A) The following average composition formula (I)
R ¹ _a SiO _{(4-a) / 2} (I)
(Wherein, R ¹ represents the same or different unsubstituted or substituted monovalent hydrocarbon group, and a is a positive number of 1.95 to 2.05).
100 parts by mass of an organopolysiloxane having a degree of polymerization of 100 or more,
(B) 20 to 150 parts by mass of a reinforcing silica having a specific surface area of 50 m ² / g or more,
(C) Curing agent The solar cell module according to any one of the above 1 to 4, which is a cured product of a silicone composition containing an effective amount for curing the component (A).
6. A solar cell module having a light transmitting substrate or a light transmitting film on the light receiving surface side and a light transmitting substrate or a light transmitting film or a back surface protective material on the back surface, the light transmission used on the back surface Solar cell module characterized in that the sealing material between the transparent substrate or the light transmitting film or the back surface protection material and the power generation element has a structure in which at least a part of silicone containing a flame retardancy imparting material is used .
7. A solar cell module having a light transmitting substrate or a light transmitting film on the light receiving side and not having a light transmitting substrate or a light transmitting film or a back surface protective material on the back side, which is used on the back side of the power generating element A solar cell module characterized in that the sealing material to be used is a structure in which at least a part of silicone containing a flame retardancy imparting material is used.
8. The thickness of the silicone containing a flame retarder is 0.05-3 mm, The solar cell module of the said 6 or 7 characterized by the above-mentioned.
9. Silicones that contain flame retardants
(A) The following average composition formula (I)
R ¹ _a SiO _{(4-a) / 2} (I)
(Wherein, R ¹ represents the same or different unsubstituted or substituted monovalent hydrocarbon group, and a is a positive number of 1.95 to 2.05).
100 parts by mass of an organopolysiloxane having a degree of polymerization of 100 or more,
(B) 5-150 parts by mass of reinforcing silica having a specific surface area of 50 m ² / g or more,
(C) Curing agent Effective amount for curing component (A) (D) A cured product of a silicone composition containing a flame retardancy imparting material The solar cell module according to any one of items 6 to 8 above .
10. A solar cell strings and a silicone composition at least in an unvulcanized state as a sealing material are stacked on the light receiving surface side light transmitting substrate or the light transmitting film, and heated and pressed under vacuum using a vacuum laminator, A method of manufacturing a solar cell module, comprising curing the composition and sealing the solar cell element strings.
11. The silicone composition in the uncured state is
(A) The following average composition formula (I)
R ¹ _a SiO _{(4-a) / 2} (I)
(Wherein, R ¹ represents the same or different unsubstituted or substituted monovalent hydrocarbon group, and a is a positive number of 1.95 to 2.05).
100 parts by mass of an organopolysiloxane having a degree of polymerization of 100 or more,
(B) 20 to 150 parts by mass of a reinforcing silica having a specific surface area of 50 m ² / g or more,
(C) Curing agent The method for producing a solar cell module according to the above 10, which is a silicone composition comprising an effective amount for curing the component (A).
12. The silicone composition in the uncured state is
(A) The following average composition formula (I)
R ¹ _a SiO _{(4-a) / 2} (I)
(Wherein, R ¹ represents the same or different unsubstituted or substituted monovalent hydrocarbon group, and a is a positive number of 1.95 to 2.05).
100 parts by mass of an organopolysiloxane having a degree of polymerization of 100 or more,
(B) 5-150 parts by mass of reinforcing silica having a specific surface area of 50 m ² / g or more,
(C) Curing agent The method for producing a solar cell module according to claim 10, which is a silicone composition containing an effective amount (D) of a flame retardant to cure the component (A).
13. The method for producing a solar cell module according to any one of 10 to 12 above, further using an ethylene / vinyl acetate copolymer, a polyolefin, or an ionomer as a sealing material.

  INDUSTRIAL APPLICABILITY The solar cell module of the present invention can provide a solar cell module which is not significantly changed as the solar cell module structure, has improved flame retardancy, and is compatible with the spark test and the like.

  The solar cell module of the present invention provides a solar cell module process which can be easily manufactured using a vacuum laminator without any significant change in the process of manufacturing the solar cell module, has improved flame retardancy, and is compatible with spark tests and the like. can do.

It is sectional drawing which shows an example of the solar cell module which concerns on the 1st Example of this invention. It is sectional drawing which shows the other example of the solar cell module which concerns on the 1st Example of this invention. It is sectional drawing which shows an example of the solar cell module which concerns on the 2nd Example of this invention. It is sectional drawing which shows the other example of the solar cell module which concerns on the 2nd Example of this invention. It is sectional drawing which shows an example of the solar cell module which concerns on the 3rd Example of this invention. It is sectional drawing which shows the other example of the solar cell module which concerns on the 3rd Example of this invention. It is sectional drawing which shows an example of the solar cell module which concerns on the 4th Example of this invention. It is sectional drawing which shows the other example of the solar cell module which concerns on the 4th Example of this invention. It is sectional drawing which shows an example of the solar cell module which concerns on the 5th Example of this invention. It is sectional drawing which shows the other example of the solar cell module which concerns on the 5th Example of this invention. It is sectional drawing which shows an example of the solar cell module which concerns on the 6th Example of this invention. It is sectional drawing which shows the other example of the solar cell module which concerns on the 6th Example of this invention. It is sectional drawing which shows an example of the solar cell module which concerns on the 7th Example of this invention. It is sectional drawing of the other example of the solar cell module which concerns on the 7th Example of this invention. It is sectional drawing which shows another example of the solar cell module which concerns on the 7th Example of this invention. It is sectional drawing which shows an example of the solar cell module which concerns on the 8th Example of this invention. It is sectional drawing which shows the other example of the solar cell module which concerns on the 8th Example of this invention. It is sectional drawing which shows another example of the solar cell module which concerns on the 8th Example of this invention. FIG. 6 is a cross-sectional view of a solar cell module of Comparative Example 1;

  The solar cell module according to the present invention is a solar cell module having a light transmitting substrate or a light transmitting film on the light receiving surface side, and a crystalline solar cell element or a thin film solar cell element comprising a semiconductor substrate as a power generation element is disposed. It is applicable in the structure by which the sealing material which is provided and which seals these solar cell elements is sealed on the light receiving surface side of the solar cell element, both on the back side, or either one or the other. .

  White plate glass, polycarbonate, acrylic resin plate etc. are used as a light transmitting substrate on the light receiving surface side and the back surface side of the solar cell module according to the present invention, and fluorine resin such as ETFE is used as a light transmitting film. .

  As the back surface protective material of the solar cell module according to the present invention, TPT "PVF (polyvinyl fluoride) / adhesive / PET (polyethylene terephthalate) / adhesive / PVF" or TPE "PVF / adhesive / PET / adhesive" For example, a film of a laminate shown in JP / EVA, or in particular “PVF / adhesive / PET” is used.

  As the sealing material according to the present invention, a structure in which a sealing material such as EVA, polyolefin or ionomer and a silicone sealing material are laminated at least partially is used. The silicone sealing material may be used alone.

  The same applies to silicone containing a flame retardancy imparting material, and as the above encapsulating material, a structure in which a sealing material such as EVA, polyolefin, ionomer, etc. and a flame retardant silicone encapsulating material are laminated at least partially is used. . The flame retardant silicone sealing material may be used alone.

  In this case, as a use mode of the sealing material, when used on the light receiving surface side of the solar cell element, for example, either EVA or silicone may be located on the light transmitting substrate side. Moreover, when using on the solar cell element back side, any of EVA and silicone may be located in the solar cell element side.

  In these cases, a three-layer structure such as EVA, silicone and EVA may be used.

  As for the flame retardant silicone, it is desirable to use it on the back side of the solar cell element because the light transmittance is poor. In this case, either EVA or flame retardant silicone may be located on the solar cell element side.

1-19 shows an example of the arrangement | positioning aspect of such a sealing material. In the following examples, a light transmitting film may be used instead of the light transmitting substrate on the light receiving surface side, and a light transmitting substrate or a light transmitting film may be used instead of the back surface protective material.
FIG. 1 shows an example of a solar cell module 100 according to a first embodiment of the present invention, wherein white sheet glass, a sealing material silicone layer 103, and a sealing material EVA layer are used as a light transmitting substrate 101 from the sunlight incident direction. As an example of a solar cell element, the crystalline silicon solar cell element strings 104, the sealing material EVA layer 102, the sealing material silicone layer 103, and the back surface protection material 106 are formed in this order. These laminates are heated and pressed under vacuum by a vacuum laminator, crosslinked and integrated. Although the solar cell module 100 formed in this manner is not shown, the outer peripheral portion is surrounded by an aluminum frame, and a terminal box for taking out the electrodes is attached to the back surface side to complete the solar cell module 100.

  Further, FIG. 2 shows another example of the solar cell module 200 according to the first embodiment of the present invention, white sheet glass as a light transmitting substrate 101, a sealing material silicone layer 103, crystalline silicon from the sunlight incident direction. The solar cell element strings 104, the sealing material silicone layer 103, and the back surface protection material 106 are formed in this order.

  FIG. 3 shows an example of a solar cell module 300 according to a second embodiment of the present invention, wherein white sheet glass, a sealing material silicone layer 103, and a sealing material EVA layer are used as the light transmitting substrate 101 from the sunlight incident direction. 102, a crystalline silicon solar cell element string 104, a sealing material EVA layer 102, and a sealing material silicone layer 103 are formed in this order.

FIG. 4 shows another example of the solar cell module 400 according to the second embodiment of the present invention, wherein white sheet glass as the light transmitting substrate 101, sealing material silicone layer 103, crystalline silicon solar according to the sunlight incident direction. The battery element strings 104 and the sealant silicone layer 103 are formed in this order.
In the embodiments of FIGS. 3 and 4, the back surface protective material is not used, and the sealing material silicone layer is exposed on the back surface side.

  FIG. 5 shows an example of a solar cell module 500 according to the third embodiment of the present invention, wherein white sheet glass, a sealing material silicone layer 103, and a sealing material EVA layer are used as the light transmitting substrate 101 from the sunlight incident direction. 102, crystalline silicon solar cell element strings 104, a sealing material EVA layer 102, and a back surface protection material 106 are formed in this order.

  FIG. 6 shows another example of the solar cell module 600 according to the third embodiment of the present invention. White glass as the light transmitting substrate 101, sealing silicone layer 103, crystalline silicon solar according to the sunlight incident direction The battery element strings 104, the sealing material EVA layer 102, and the back surface protection material 106 are formed in this order.

  FIG. 7 shows an example of a solar cell module 700 according to the fourth embodiment of the present invention, wherein white sheet glass, a sealing material silicone layer 103, and a sealing material EVA layer are used as the light transmitting substrate 101 from the sunlight incident direction. A crystalline silicon solar cell element string 104 and a sealing material EVA layer 102 are formed in this order.

FIG. 8 shows another example of the solar cell module 800 according to the fourth embodiment of the present invention, wherein white sheet glass, sealing material silicone layer 103, crystalline silicon solar as the light transmitting substrate 101 from the sunlight incident direction. The battery element strings 104 and the sealing material EVA layer 102 are formed in this order.
The back surface protective material is not used in the examples of FIGS.

  FIG. 9 is an example of a solar cell module 900 according to the fifth embodiment of the present invention, showing white sheet glass, a sealing material EVA layer 102, a crystalline silicon solar cell element as a light transmitting substrate 101 from the sunlight incident direction. The string 104, the sealing material EVA layer 102, the sealing material silicone layer 103, and the back surface protection material 106 are formed in this order.

  FIG. 10 shows another example of the solar cell module 1000 according to the fifth embodiment of the present invention, wherein white sheet glass, sealing material EVA layer 102, crystalline silicon solar is used as the light transmitting substrate 101 from the sunlight incident direction. The battery element strings 104, the sealing material silicone layer 103, and the back surface protection material 106 are formed in this order.

  FIG. 11 shows an example of a solar cell module 1100 according to the sixth embodiment of the present invention, wherein white sheet glass, a sealing material EVA layer 102, a crystalline silicon solar cell element as the light transmitting substrate 101 from the sunlight incident direction. The string 104, the sealing material EVA layer 102, and the sealing material silicone layer 103 are formed in this order.

FIG. 12 shows another example of the solar cell module 1200 according to the sixth embodiment of the present invention, wherein white sheet glass, sealing material EVA layer 102, crystalline silicon solar is used as the light transmitting substrate 101 from the sunlight incident direction. The battery element strings 104 and the sealant silicone layer 103 are formed in this order.
Also in the examples of FIGS. 11 and 12, the back surface protective material is not used.

  FIG. 13 is an example of a solar cell module 1300 according to the seventh embodiment of the present invention, showing white sheet glass, a sealing material EVA layer 102, a crystalline silicon solar cell element as a light transmitting substrate 101 from the sunlight incident direction. The string 104, the sealing material EVA layer 102, the sealing material flame-retardant silicone layer 105, and the back surface protection material 106 are formed in this order.

  FIG. 14 shows another example of the solar cell module 1400 according to the seventh embodiment of the present invention. White glass as the light transmitting substrate 101, the sealing material EVA layer 102, crystalline silicon solar according to the sunlight incident direction The battery element strings 104, the encapsulant flame-retardant silicone layer 105, and the back surface protective material 106 are formed in this order.

  FIG. 15 is another example of the solar cell module 1500 according to the seventh embodiment of the present invention, showing white sheet glass as a light transmitting substrate 101, a sealing material silicone layer 103, crystalline silicon solar according to the sunlight incident direction. The battery element strings 104, the encapsulant flame-retardant silicone layer 105, and the back surface protective material 106 are formed in this order.

  FIG. 16 is an example of a solar cell module 1600 according to the eighth embodiment of the present invention, showing white sheet glass, a sealing material EVA layer 102, a crystalline silicon solar cell element as a light transmitting substrate 101 from the sunlight incident direction. The string 104, the sealing material EVA layer 102, and the flame retardant silicone layer 105 are formed in this order.

  FIG. 17 shows another example of the solar cell module 1700 according to the eighth embodiment of the present invention. White glass as the light transmitting substrate 101, the sealing material EVA layer 102, crystalline silicon solar according to the sunlight incident direction The battery element strings 104 and the encapsulant flame-retardant silicone layer 105 are formed in this order.

FIG. 18 is another example of the solar cell module 1800 according to the eighth embodiment of the present invention, showing white sheet glass as the light transmitting substrate 101, sealing material silicone layer 103, crystalline silicon solar according to the sunlight incident direction. The battery element strings 104 and the encapsulant flame-retardant silicone layer 105 are formed in this order.
The back surface protective material is not used also in the example of FIGS.

  FIG. 19 shows a solar cell module 1900 according to a comparative example of the present invention, in which a white sheet glass as a light transmitting substrate 101, a sealing material EVA layer 102, crystalline silicon solar cell element strings 104, and a sealing material It is comprised in order of the EVA layer 102 and the back surface protection material 106. FIG.

  Here, in the above-mentioned composite laminate, the thickness of the sealing material silicone layer is preferably 0.05 to 3 mm, particularly preferably 0.1 to 1 mm, and the thickness of another sealing material, for example, an EVA layer is 0.4 to 0. 6 mm is preferred. Therefore, the thickness of the encapsulant composite laminate is preferably 0.45 to 3.6 mm, particularly 0.5 to 1.6 mm.

  Moreover, as shown in FIG. 2, when using a sealing material silicone layer alone, the thickness of a sealing material silicone layer is 0.3-3 mm, Preferably it is 0.1-1 mm.

  Moreover, as shown in FIG. 13, FIG. 14, FIG. 15, FIG. 16, FIG. 17, and FIG. 18, when using the sealant flame retardant silicone layer, the thickness of the flame retardant silicone layer is 0.3 to 3 mm. , Preferably 0.1 to 1 mm.

In the present invention, the silicone layer is preferably obtained by curing a silicone composition containing the following components (A) to (C).
(A) The following average composition formula (I)
R ¹ _a SiO _{(4-a) / 2} (I)
(Wherein, R ¹ represents the same or different unsubstituted or substituted monovalent hydrocarbon group, and a is a positive number of 1.95 to 2.05).
Organopolysiloxanes having a degree of polymerization of 100 or more,
(B) Reinforcing silica having a specific surface area of 50 m ² / g or more,
(C) Curing Agent Effective Amount for Curing Component (A) In this case, (D) a flame retardant can be blended for the purpose of imparting flame retardancy.

More specifically, the component (A) is an organopolysiloxane having a degree of polymerization of 100 or more, which is represented by the following average composition formula (I).
R ¹ _a SiO _{(4-a) / 2} (I)
(Wherein, R ¹ represents the same or different unsubstituted or substituted monovalent hydrocarbon group, and a is a positive number of 1.95 to 2.05).

In the above average composition formula (I), R ¹ represents the same or different non-substituted or substituted monovalent hydrocarbon group, and usually has 1 to 12 carbon atoms, particularly preferably 1 to 8 carbon atoms, And alkyl groups such as methyl, ethyl, propyl, butyl, hexyl and octyl, cycloalkyl groups such as cyclopentyl and cyclohexyl, alkenyl groups such as vinyl, allyl and propenyl, and cyclo An alkenyl group, an aryl group such as a phenyl group or a tolyl group, an aralkyl group such as a benzyl group or a 2-phenylethyl group, or a group obtained by substituting part or all of the hydrogen atoms of these groups with a halogen atom or a cyano group Among these, methyl, vinyl, phenyl and trifluoropropyl are preferable, and methyl and vinyl are particularly preferable.

  Specifically, the main chain of the organopolysiloxane comprises repeating dimethylsiloxane units, or part of the dimethylpolysiloxane structure consisting of repeating dimethylsiloxane units constituting the main chain, a phenyl group, a vinyl group, It is preferable to use a diphenylsiloxane unit having a 3,3,3-trifluoropropyl group or the like, a methylphenylsiloxane unit, a methylvinylsiloxane unit, a methyl-3,3,3-trifluoropropylsiloxane unit or the like, and the like. .

In particular, those having an aliphatic unsaturated group such as two or more of an alkenyl group and a cycloalkenyl group in one molecule of organopolysiloxane are preferable, and a vinyl group is particularly preferable. In this case, it is preferable that 0.01 to 20% by mole, particularly 0.02 to 10% by mole of all R ¹ is an aliphatic unsaturated group. The aliphatic unsaturated group may be bonded to the silicon atom at the molecular chain end, or may be bonded to the silicon atom in the middle of the molecular chain, or both, but at least the molecular chain terminal Preferably, it is bonded to the silicon atom of In addition, a is a positive number of 1.95 to 2.05, preferably 1.98 to 2.02, and more preferably 1.99 to 2.01.

  The organopolysiloxane of component (A) is blocked at the molecular chain end with a triorganosiloxy group such as a trimethylsiloxy group, dimethylphenylsiloxy group, dimethylhydroxysiloxy group, dimethylvinylsiloxy group, methyldivinylsiloxy group, trivinylsiloxy group, etc. Preferred ones are listed. Particularly preferable examples include methylvinylpolysiloxane, methylphenylvinylpolysiloxane, methyltrifluoropropylvinylpolysiloxane and the like.

  Such organopolysiloxanes are obtained, for example, by (co) hydrolytic condensation of one or more of organohalogenosilanes, or alkaline or acidity of cyclic polysiloxanes (trimer, tetramer of siloxane, etc.) It can be obtained by ring-opening polymerization using a catalyst of These are basically linear diorganopolysiloxanes, but the component (A) may be a mixture of two or more different molecular weights (degree of polymerization) and molecular structures.

  The degree of polymerization of the organopolysiloxane is 100 or more, preferably 100 to 100,000, and particularly preferably 3,000 to 20,000. In addition, this polymerization degree can be measured as a weight average polymerization degree of polystyrene conversion by gel permeation chromatography (GPC) analysis.

The reinforcing silica having a BET specific surface area of 50 m ² / g or more of the component (B) is added to obtain a composition having excellent mechanical strength before and after curing. In this case, in order to improve the transparency of the silicone sealing material, the BET specific surface area is preferably more than 200 m ² / g, and more preferably 250 m ² / g or more. When the BET specific surface area is 200 m ² / g or more, the transparency of the cured product tends to be high. The upper limit is not particularly limited, but is usually 500 m ² / g or less.

  Examples of such reinforcing silica as the component (B) include fumed silica (dry silica or fumed silica), precipitated silica (wet silica) and the like. In addition, those obtained by hydrophobizing these surfaces with chlorosilane, alkoxysilane, hexamethyldisilazane or the like are also suitably used. In particular, treatment with hexamethyldisilazane is preferred because the transparency is increased. The use of fumed silica as reinforcing silica is preferred to enhance transparency. The reinforcing silica may be used alone or in combination of two or more.

  As the reinforcing silica of component (B), commercially available products can be used. For example, Aerosil series such as Aerosil 130, Aerosil 200, Aerosil 300, Aerosil R-812, Aerosil R-972, Aerosil R-974 (Japan Surface-untreated or surface-hydrophobicized with Aerosil Co., Ltd., Cabosil MS-5, MS-7 (Cabot Co., Ltd.), Leorosil QS-102, 103, MT-10 (manufactured by Tokuyama Co., Ltd.), etc. Surface-untreated or surface of (that is, hydrophilic or hydrophobic) fumed silica, Toxeal US-F (manufactured by Tokuyama Co., Ltd.), NIPSIL-SS, NIPSIL-LP (manufactured by Nippon Silica Kogyo Co., Ltd.), etc. Hydrophobicized precipitated silica and the like can be mentioned.

  The compounding amount of the reinforcing silica of the component (B) is 20 to 150 parts by mass, preferably 30 to 90 parts by mass, more preferably 50 to 50 parts by mass with respect to 100 parts by mass of the organopolysiloxane of the component (A). 90 parts by mass. If the blending amount of the component (B) is 20 parts by mass or more, the reinforcing effect before and after curing is easily obtained, and the transparency of the silicone sealing material after curing does not decrease. When it is 150 parts by mass or less, the dispersion of the silica in the silicone sealing material is good, and at the same time, the processability to a sheet form is also good. However, when the component (D) is contained, the lower limit of the component (B) may be 5 parts by mass.

  The curing agent for the component (C) is not particularly limited as long as it can cure the component (A), but it is widely known as an addition reaction (hydrosilylation reaction) curing agent known as a curing agent for silicone compositions. That is, a combination of an organohydrogenpolysiloxane (crosslinking agent) and a hydrosilylation reaction catalyst, or (b) an organic peroxide is preferred.

The organohydrogenpolysiloxane as a crosslinking agent in the (a) addition reaction (hydrosilylation reaction) contains hydrogen atoms (SiH groups) bonded to at least two silicon atoms in one molecule, and the following averages Composition formula (II)
R ² _b H _c SiO _{(4-bc) / 2} (II)
(Wherein R ² is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 6 carbon atoms, preferably one having no aliphatic unsaturated bond. Specific examples include a methyl group, an ethyl group, Alkyl group such as propyl group, butyl group, pentyl group and hexyl group, unsubstituted monovalent hydrocarbon group such as cyclohexyl group, cyclohexenyl group and phenyl group, 3,3,3-trifluoropropyl group, cyanomethyl group and the like Or a substituted monovalent hydrocarbon group such as a substituted alkyl group in which at least a part of the hydrogen atoms of the above monovalent hydrocarbon group is substituted with a halogen atom or a cyano group, b is 0.7 to 2.1, c Is 0.01 to 1.0, and b + c is 0.8 to 3.0, preferably b is 0.8 to 2.0, c is 0.2 to 1.0, and b + c is 1.0 to 2 Is a positive number satisfying .5)
The conventionally known organohydrogenpolysiloxanes shown by the above are applicable. The molecular structure of the organohydrogenpolysiloxane may be linear, cyclic, branched, or three-dimensional network. In this case, one having a number (or degree of polymerization) of silicon atoms in one molecule of 2 to 300, particularly 4 to 200, which is liquid at room temperature is preferably used. The hydrogen atom (SiH group) bonded to the silicon atom may be at the end of the molecular chain or at the side chain, or both, and at least two (usually 2 to 300) in one molecule. Preferably, those containing 3 or more (for example, 3 to 200), and more preferably 4 to 150 or so are used.

Specifically as this organohydrogenpolysiloxane, 1,1,3,3-tetramethyldisiloxane, 1,3,5,7-tetramethylcyclotetrasiloxane, methyl hydrogen cyclopolysiloxane, methyl hydrogen Siloxane · dimethyl siloxane cyclic copolymer, tris (dimethylhydrogensiloxy) methylsilane, tris (dimethylhydrogensiloxy) phenylsilane, both terminal trimethylsiloxy group blocked methyl hydrogen polysiloxane, both terminal trimethylsiloxy group blocked dimethyl siloxane · methyl Hydrogen siloxane copolymer, dimethylpolysiloxane terminated with dimethylpolysiloxane, dimethylpolysiloxane terminated with dimethylsiloxane, methyl hydride Gensiloxane copolymer, both terminal trimethylsiloxy group-capped methylhydrogensiloxane diphenylsiloxane copolymer, both terminal trimethylsiloxy group-capped methylhydrogensiloxane diphenylsiloxane dimethylsiloxane copolymer, cyclic methyl hydrogen polysiloxane, Cyclic methyl hydrogen siloxane / dimethylsiloxane copolymer, cyclic methyl hydrogen siloxane / diphenylsiloxane / dimethyl siloxane copolymer, copolymer comprising (CH ₃ ) ₂ HSiO _1/2 units and SiO _4/2 units, A copolymer or the like comprising (CH ₃ ) ₂ HSiO _1/2 units, SiO _4/2 units and (C ₆ H ₅ ) SiO _3/2 units, or in each of the above exemplified compounds, a part or all of methyl groups Other alkyl groups such as ethyl and propyl and Those substituted with an aryl group such as a phenyl group may, for example, be mentioned.

  The compounding amount of the organohydrogenpolysiloxane is 0.1 to 30 parts by mass, more preferably 0.1 to 10 parts by mass, still more preferably 0.3 with respect to 100 parts by mass of the organopolysiloxane (A). It is preferable to set it as -10 mass parts.

  In addition, this organohydrogenpolysiloxane has a molar ratio of 0.5 hydrogen atom (i.e., SiH group) bonded to the silicon atom in the component (C) to the alkenyl group bonded to the silicon atom in the component (A). It is preferable to blend in an amount of 5 to 5 mol / mol, preferably 0.8 to 4 mol / mol, more preferably 1 to 3 mol / mol.

  In addition, as the hydrosilylation reaction catalyst used for the crosslinking reaction of the above (a) addition reaction (hydrosilylation reaction), known catalysts can be applied. For example, platinum black, platinum chloride, platinum platinum chloride, platinum chloride Examples thereof include a reactant of an acid and a monohydric alcohol, a complex of chloroplatinic acid and an olefin, a platinum-based catalyst such as platinum bisacetoacetate, a palladium-based catalyst, a rhodium-based catalyst and the like. In addition, the compounding quantity of this hydrosilylation reaction catalyst can be made into a catalytic quantity, Usually, it converts into platinum group metal mass, and it is with respect to the total mass of (A), (B) component and organohydrogenpolysiloxane, 1 to 1,000 ppm is preferable, and a range of 5 to 100 ppm is more preferable. If it is less than 1 ppm, the addition reaction may not proceed sufficiently and curing may be insufficient, and it is uneconomical to add an amount exceeding 1,000 ppm.

  In addition to the above reaction catalyst, an addition reaction control agent may be used for the purpose of adjusting the curing rate or pot life. Specific examples thereof include ethynyl cyclohexanol and tetramethyl tetravinyl cyclotetrasiloxane.

  On the other hand, as the organic peroxide (b), for example, benzoyl peroxide, 2,4-dichlorobenzoyl peroxide, p-methylbenzoyl peroxide, o-methylbenzoyl peroxide, 2,4-dicumyl peroxide, 2,5-Dimethyl-bis (2,5-t-butylperoxy) hexane, di-t-butylperoxide, t-butylperbenzoate, 1,6-hexanediol-bis-t-butylperoxycarbonate etc Can be mentioned.

  The amount of the (b) organic peroxide added is preferably 0.1 to 15 parts by mass, and more preferably 0.2 to 10 parts by mass, per 100 parts by mass of the component (A). If the addition amount is 0.1 parts by mass or more, the crosslinking reaction proceeds sufficiently to hardly cause a decrease in hardness or insufficient strength. A content of 15 parts by mass or less is preferable in terms of cost, and a large amount of decomposition products of the curing agent is generated. It is difficult to increase the color change of the sheet.

As the flame retardancy imparting agent of the component (D), known materials can be used, and platinum compounds, carbon black, fumed titanium oxide, benzara (Fe ₂ O and Fe ₃ O ₄ ), and triazoles such as benzotriazole Compounds can be formulated. The flame retardant may be used alone or in combination of two or more. The flame retardancy can also be improved by highly filling the crystalline silica or the aluminum oxide powder to relatively reduce the amount of the siloxane component.

  Although the addition amount of the component (D) is not particularly limited, it is preferably 0.001 to 0.5 parts by mass, more preferably 0.002 to 0.05 parts by mass with respect to a total of 100 parts by mass of the components (A) to (C). It is preferable to use a part.

  The silicone composition according to the present invention can be obtained by kneading a predetermined amount of the above-mentioned components with a two-roll mill, a kneader, a Banbury mixer or the like.

  The plasticity of the thus prepared silicone composition before curing will be 150 to 1,000, preferably 200 to 800, and more preferably 250 to 600. When the plasticity is greater than 150, the shape of the uncured sheet is easy to maintain, and the tack is not too strong and easy to use. In addition, if it is 1,000 or less, the sheeting process becomes easy. The degree of plasticity can be measured according to JIS K6249.

  When the silicone composition in an unvulcanized state according to the present invention is formed into a sheet, the forming method is not particularly limited, but extrusion molding, calendar molding, etc. may be used. At this time, the thickness of the silicone composition sheet is preferably 0.05 to 3 mm, particularly 0.1 to 1 mm.

  The silicone composition in an unvulcanized state according to the present invention can be formed, for example, by using EVA as a base material, and bonding one surface of the silicone composition to EVA.

  For example, as a method of laminating the silicone composition in a non-vulcanized state and EVA, the sheet on which both layers are laminated in advance is simultaneously press-formed with a roll, or after press-formed with a single layer of silicone by a roll, in a winding process There is a method of pasting and molding while laminating simultaneously with EVA.

  In addition, hardening of the said silicone composition can be performed by heating for 20 to 60 minutes at 120-150 degreeC.

  Here, the manufacturing method of the solar cell module of the present invention will be described between the light receiving surface side light transmitting substrate or the light transmitting film and the back surface side light transmitting substrate or the light transmitting film or the back surface protective material, A solar cell element string and a silicone composition at least in an unvulcanized state as a sealing material are interposed, heat pressure is applied under vacuum using a vacuum laminator, and the silicone composition is cured to seal the solar cell element string. The solar cell strings and the silicone composition at least in an unvulcanized state are stacked as a sealing material on a light-receiving surface-side light transmitting substrate or a light transmitting film, and heat pressure is applied under vacuum using a vacuum laminator. And curing the silicone composition to seal the solar cell element strings. In this case, as the sealing material, in addition to the above-mentioned silicone composition, EVA, polyolefin or ionomer can be used in combination. At this time, the solar cell strings may be surrounded by silicone (cured product of silicone composition), by EVA, polyolefin or ionomer, or by both silicone and EVA, polyolefin or ionomer.

  More specifically, in the case where the solar cell module is a solar cell module having a light transmitting substrate or a light transmitting film on the light receiving surface side, for example, a two-layer structure of EVA and a silicone composition in an unvulcanized state Is placed on the transparent substrate, and the solar cell strings are placed on the top of the laminate, and an EVA single layer, or EVA and EVA and uncured silicone are placed on the back of the solar cell strings. The composition is placed on a laminate having a two-layer structure, or a silicone single layer is placed, and a back surface protective material is laminated on the backmost side, and then heated and pressed under vacuum using a vacuum laminator to obtain an unvulcanized state It can be modularized by crosslinking the silicone composition and EVA.

  EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to the following examples. In addition, the part of the unit of a compounding quantity is a mass part. Moreover, a weight average molecular weight and a weight average polymerization degree are polystyrene conversion values in a gel permeation chromatography (GPC) analysis.

[Example]
First, the silicone composition used in the examples will be described.
<Preparation of translucent sealing material>
100 parts of organopolysiloxane consisting of 99.85 mol% of dimethylsiloxane units, 0.025 mol% of methyl vinyl siloxane units, 0.125 mol% of dimethyl vinyl siloxane units and having an average degree of polymerization of about 6,000, BET specific surface area 70 parts of 300 m ² / g silica (trade name Aerosil 300, manufactured by Nippon Aerosil Co., Ltd.), 16 parts of hexamethyldisilazane as a dispersant, and 4 parts of water are added and kneaded in a kneader at 170 ° C. The compound was prepared by heat treatment for 2 hours.

  100 parts of the above-mentioned compound and 0.5 parts of C-25A (platinum catalyst) / C-25B (organohydrogenpolysiloxane) (both manufactured by Shin-Etsu Chemical Co., Ltd.) as an addition crosslinking curing agent After uniformly mixing 0 parts with 2 rolls, a sheet of the silicone composition in an unvulcanized state was produced by a calender roll.

<Preparation of Flame Retardant-Forming Silicone Composition>
100 parts of organopolysiloxane consisting of 99.85 mol% of dimethylsiloxane units, 0.025 mol% of methyl vinyl siloxane units, 0.125 mol% of dimethyl vinyl siloxane units and having an average degree of polymerization of about 6,000, BET specific surface area 30 parts of 200 m ² / g of silica (trade name Aerosil 200, manufactured by Nippon Aerosil Co., Ltd.), 4 parts of hexamethyldisilazane as a dispersant, and 1.2 parts of water are added and kneaded in a kneader, 170 ° C. The mixture was heat treated for 2 hours to prepare a compound.

  100 parts of the above compound and 50 parts of crystalline silica (Crystallite VX-S Co., Ltd. Ryumori Co., Ltd.) having an average particle size of 4 μm and titanium oxide CR-60 (manufactured by Ishihara Sangyo Co., Ltd.) having an average particle size of 0.2 μm 3 parts and 0.015 parts of benzotriazole were mixed to obtain a flame retardancy imparting compound.

  This compound is added in an amount of 0.5 parts of C-25A (platinum catalyst) / C-25B (organohydrogenpolysiloxane) (both from Shin-Etsu Chemical Co., Ltd.) as an addition crosslinking curing agent. After uniformly mixing 0 parts with 2 rolls, a sheet of the silicone composition in an unvulcanized state was produced by a calender roll.

  In addition, EVA sheet (fast cure type) for SANBIC Co., Ltd. solar cell is used as EVA, Nakajima Glass Industrial Co., Ltd. white sheet glass (3.2 mm thickness, with single-sided embossed shape) as a light transmitting substrate on the surface, back surface protection material The solar cell module of the Example and the comparative example was produced using TPT (Tedlar-PET-Tedlar: PTD250) of MA packaging Co., Ltd. as a.

  The solar cell modules manufactured as the example and the comparative example have a structure in which the sealing material silicone layer 103 and the sealing material EVA layer 102 are used alone as shown in FIG. 2, FIG. 4 and FIG. It is a structure where different kinds of stoppers are combined. Here, the sealing material EVA layer 102 has a thickness of 0.45 mm and is sheet-like. In addition, the sealant silicone layer 103 has a thickness of 0.5 mm.

Moreover, the laminated body of the sealing material silicone layer 103 and the sealing material EVA layer 102 which are used for the solar cell module 100, 300, 500, 700, 900, and 1100 is the sheet form which each integrally molded beforehand. That is, the total thickness of the EVA silicone laminate is 0.95 mm.
Furthermore, the encapsulant flame-retardant silicone layer 105 used in the solar cell modules 1300 and 1600 is each 0.5 mm thick.

  Here, the solar cell module 100 produces six types of 0.03 mm, 0.05 mm, 0.1 mm, 0.5 mm, 1 mm, and 3 mm thickness of the sealing material silicone composition in an unvulcanized state, and seals them respectively. It was made to unite with the stopping material EVA layer 102. Therefore, the thicknesses of the sealing material EVA silicone laminate are 0.48 mm, 0.50 mm, 0.55 mm, 0.95 mm, 1.45 mm, and 3.45 mm, respectively.

Next, each process in manufacture of each solar cell module is demonstrated.
[Fabrication of solar cell module]
[1] Preparation of EVA silicone laminate sheet The above silicone composition was formed into a sheet by calendering. At this time, the silicone composition in an unvulcanized state is prepared to have a thickness of 0.03 mm, 0.05 mm, 0.1 mm, 0.5 mm, 1 mm, 3 mm, and processing and molding while bonding EVA as a substrate did.
The upper surface of the silicone composition in the uncured state was formed by pressing the embossed film to protect the silicone surface.
[2] Configuration of Solar Cell Element (Cell) As the solar cell 104, a 156 mm square p-type single crystal cell for a solar cell was used.
[3] Production of Solar Cell Element (Cell) Strings The solar cell cell strings 104 were arranged in 60 straight sizes (6 × 10 columns), and connection wires were respectively connected in series and formed.
[4] Formation of Solar Cell Module The solar cell module 100 will be described as an example.
The EVA silicone composite (102, 103) was placed on the upper surface of the white sheet glass 101 so that the silicone composition was oriented on the side in contact with the white sheet glass 101. The above-described solar cell strings 104 are mounted on the top surface of the sealing material EVA layer 102, and the EVA silicone composite (102, 103) is mounted on the top surface of the sealing material EVA layer 102. Protective material TPT106 was placed.
The laminate of the glass, the encapsulant, the cell encapsulant, and the back surface protective material thus obtained was heated and pressed under vacuum at 140 ° C. with a vacuum laminator to form a solar cell module. It was possible to laminate and seal well without causing a visually confirmed interface between the sealing material EVA layer 102 and the sealing material silicone layer 103 and without generation of wrinkles and waviness. .

  In the solar cell module manufactured through the above steps, a frame made of aluminum alloy was attached to the periphery, an edge seal material such as silicone was enclosed, and the final frame corner was screwed to complete the final solar cell module .

Next, an example and a comparative example of a spark test are shown.
[Spring test]
Implemented in accordance with Article 63 of the Building Standard Act.
The brand prepared two wooden brands having a size of 80 mm × 80 mm × 60 mm and a weight of 155 g per specimen, and was precured for 24 hours or more at a temperature of 23 ± 2 ° C. and a relative humidity of 50 ± 5%.
As for the blowing, the outlet height was 250 mm, the width was 1,000 mm or more, and the length of the blowout nozzle was 1,200 mm or more.
The burner temperature was set to be 900 ± 50 ° C. at 60 mm from the top of the burner, and the brand was exposed to the flame for 240 seconds.
The solar cell module produced as described above was placed at an inclination angle of 30 ° so that the light receiving surface side glass was on the top.
Two brands were placed on the top of the solar cell module as specified in Article 63 of the Building Standard Law. The test was continued until the burning of the brand completely disappeared, and the condition of the solar cell module after burning was observed.
First, the result of the spark test of the solar cell module in which the encapsulant silicone layer 103 and the flame retardant silicone layer 105 are formed to have a thickness of 0.5 mm is shown in Table 1. Further, as a comparative example, the results of the spark test of the solar cell module not using the silicone composition are shown in Table 2.

As shown in Table 1, all the solar cell modules in Table 1 passed with no combustion through holes in the state of the solar cell modules after the spark test. In particular, the solar cell modules 1300, 1400, 1500, 1600, 1700, and 1800 using the flame-retardant silicone layer 105 have a result that the burnt area of the back surface of the solar cell module is small and the flame resistance is high.
As shown in Table 2, in the state of the solar cell module after the spark test, in the solar cell module 1900, a combustion through hole was generated, and the brand fell on the back side. The through hole was 200 × 200 mm and was rejected.
This result shows that if the silicone layer is partially present as a sealing material, the spark test passes.

  Moreover, in the solar cell module 100, the evaluation result in which the thickness of the sealing material silicone layer 103 was changed is shown in Table 3.

When the thickness of the sealing material silicone layer 103 was 0.05 mm, 0.1 mm, 0.5 mm, 1 mm, and 3 mm, the combustion through holes were not generated and the test was passed.
Further, in any of the pass determinations, no combustion accompanied by a flame was found on the back of the solar cell module.
Furthermore, the tip of the flame by combustion of the test body did not reach the position of 600 mm on the left and right.

  On the other hand, when the thickness of the encapsulant silicone layer 103 was 0.03 mm, in the spark test, the combustion through holes were 120 × 110 mm, and a part of the brand dropped on the back surface, which resulted in a rejection. The evaluation results are shown in Table 4. Therefore, the thickness of the encapsulant silicone layer is desirably 0.05 mm or more.

  As described above, the solar cell module according to the present invention is flame retardant by using a sealing material of a composite laminate in which silicone is applied at least in part to a sealing material, for example, EVA, polyolefin, ionomer, etc. It is possible to provide a solar cell module that can be enhanced and be compatible with spark tests.

100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900 solar cell module 101, light transmissive substrate 102, sealing material EVA Layer 103 Sealing material (translucent) silicone layer 104 Solar cell element strings 105 Sealing material (flame retardant) silicone layer 106 Back surface protection material

Claims (13)

  A solar cell module having a light transmitting substrate or a light transmitting film on the light receiving surface side and having no light transmitting substrate or light transmitting film or back surface protective material on the back surface side, the light receiving surface side light transmitting substrate Alternatively, a structure in which silicone is at least partially used as a sealing material between the light transmitting film and the power generation element, and a structure in which silicone is at least partially used as a sealing material on the back surface side of the power generation element The solar cell module characterized by being.   A solar cell module having a light transmitting substrate or a light transmitting film on the light receiving surface side and having no light transmitting substrate or light transmitting film or back surface protective material on the back surface side, the light receiving surface side light transmitting substrate Alternatively, a solar cell module having a structure in which at least a part of silicone is used as a sealing material between the light transmitting film and the power generation element.   A solar cell module having a light transmitting substrate or a light transmitting film on the light receiving surface side and having no light transmitting substrate or light transmitting film or back surface protection material on the back surface side, and sealing the back surface side of the power generation element A solar cell module having a structure in which silicone is at least partially used as a stopper.   The thickness of a silicone is 0.05-3 mm, The solar cell module of any one of Claims 1-3 characterized by the above-mentioned. Silicone is
(A) The following average composition formula (I)
R ¹ _a SiO _{(4-a) / 2} (I)
(Wherein, R ¹ represents the same or different unsubstituted or substituted monovalent hydrocarbon group, and a is a positive number of 1.95 to 2.05).
100 parts by mass of an organopolysiloxane having a degree of polymerization of 100 or more,
(B) 20 to 150 parts by mass of a reinforcing silica having a specific surface area of 50 m ² / g or more,
(C) Curing agent The solar cell module according to any one of claims 1 to 4, which is a cured product of a silicone composition containing an effective amount for curing the component (A).   A solar cell module having a light transmitting substrate or a light transmitting film on the light receiving surface side and a light transmitting substrate or a light transmitting film or a back surface protective material on the back surface, the light transmission used on the back surface Solar cell module characterized in that the sealing material between the transparent substrate or the light transmitting film or the back surface protection material and the power generation element has a structure in which at least a part of silicone containing a flame retardancy imparting material is used .   A solar cell module having a light transmitting substrate or a light transmitting film on the light receiving side and not having a light transmitting substrate or a light transmitting film or a back surface protective material on the back side, which is used on the back side of the power generating element A solar cell module characterized in that the sealing material to be used is a structure in which at least a part of silicone containing a flame retardancy imparting material is used.   The thickness of the silicone containing a flame retarder is 0.05-3 mm, The solar cell module of Claim 6 or 7 characterized by the above-mentioned. Silicones that contain flame retardants
(A) The following average composition formula (I)
R ¹ _a SiO _{(4-a) / 2} (I)
(Wherein, R ¹ represents the same or different unsubstituted or substituted monovalent hydrocarbon group, and a is a positive number of 1.95 to 2.05).
100 parts by mass of an organopolysiloxane having a degree of polymerization of 100 or more,
(B) 5-150 parts by mass of reinforcing silica having a specific surface area of 50 m ² / g or more,
The sun according to any one of claims 6 to 8, which is a cured product of a silicone composition containing (C) a curing agent and an effective amount to cure the component (A) and (D) a flame retardant. Battery module.   A solar cell strings and a silicone composition at least in an unvulcanized state as a sealing material are stacked on the light receiving surface side light transmitting substrate or the light transmitting film, and heated and pressed under vacuum using a vacuum laminator, A method of manufacturing a solar cell module, comprising curing the composition and sealing the solar cell element strings. The silicone composition in the uncured state is
(A) The following average composition formula (I)
R ¹ _a SiO _{(4-a) / 2} (I)
(Wherein, R ¹ represents the same or different unsubstituted or substituted monovalent hydrocarbon group, and a is a positive number of 1.95 to 2.05).
100 parts by mass of an organopolysiloxane having a degree of polymerization of 100 or more,
(B) 20 to 150 parts by mass of a reinforcing silica having a specific surface area of 50 m ² / g or more,
(C) Curing agent The method for producing a solar cell module according to claim 10, which is a silicone composition containing an effective amount for curing the component (A). The silicone composition in the uncured state is
(A) The following average composition formula (I)
R ¹ _a SiO _{(4-a) / 2} (I)
(Wherein, R ¹ represents the same or different unsubstituted or substituted monovalent hydrocarbon group, and a is a positive number of 1.95 to 2.05).
100 parts by mass of an organopolysiloxane having a degree of polymerization of 100 or more,
(B) 5-150 parts by mass of reinforcing silica having a specific surface area of 50 m ² / g or more,
(C) Curing agent The method for producing a solar cell module according to claim 10, which is a silicone composition containing an effective amount (D) of a flame retardant to cure the component (A).   The manufacturing method of the solar cell module of any one of Claims 10-12 which used ethylene-vinyl acetate copolymer, polyolefin, or an ionomer together as a sealing material.

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