JP2017163064A - Solar cell module and manufacturing method of solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell module having improved fire retardance, and adaptable to spill test, and the like.SOLUTION: A solar cell module 200 having a light-transmitting board or a light-transmitting film 101 on the light receiving surface, and a light-transmitting board or a light-transmitting film or a backside protective material 106 on the backside has such a structure that silicon is used, at least partially, as a sealing material 103 between the light-transmitting board or light-transmitting film and a power generation element, and silicon is used, at least partially, as a sealing material 103 between the light-transmitting board or light-transmitting film or backside protective material used on the backside and a power generation element.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a flame-retardant solar cell module and a method for producing the same.

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

  Since these sealing materials are flammable resins, reduction of combustibility is a problem. Especially when used for residential roofs, the light-transmitting substrate on the light-receiving surface side, such as glass, is cracked by a flame caused by sparks, and the solar cell module continues to burn by igniting a sealing material such as EVA. A phenomenon occurs.

  In addition, when the solar cell module continues to burn, the backsheet is mainly made of PET, so combustion cannot be stopped, combustion holes are created in the backsheet, and glass or cell fragments 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 related to fire prevention. If the shards fall to the bottom, the test may not be passed.

  In addition, when a light-transmitting film is used on the light-receiving surface side and the back surface side, as seen in flexible thin-film solar cells, the light-transmitting film spreads and a combustion hole is generated by a flame caused by a spark. In such a case, when the sealing material such as EVA is ignited, the solar cell module continues to burn, and finally, a phenomenon in which the combustion product falls to the lower portion occurs.

As a measure for improving such a problem, there is a method of adding a chlorine-based or red phosphorus-based flame retardant to a cell back surface side sealing material of a solar battery (Patent Document 1).
In addition, a method of adding a flame retardant such as an intimate ammonium phosphate that suppresses combustion by heat insulation to the encapsulant (Patent Document 2), or nanoclay, hydrous magnesium silicate, calcium carbonate, etc. A method of adding nanoparticles is disclosed (Patent Document 3).

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

JP-A-9-27633 JP 2007-335853 A JP 2011-134986 A

  The present invention has been made to solve the above-described problems, and provides a solar cell module that is easy in the solar cell module process and that has good laminate sealing and is excellent in flame retardancy, and a method for producing the solar cell module. 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 the solar cell module sealing material.

  As the solar cell encapsulant, EVA, polyolefin, ionomer or the like is generally used, but flame retardancy can be improved by applying a part of silicone to such a resin. A structure in which a laminate of EVA, polyolefin, ionomer or the like and silicone is taken may be used, or a structure in which only silicone is applied to the sealing material may be used.

Therefore, this invention provides the following solar cell module and its manufacturing method.
[1]
A solar cell module having a light-transmitting substrate or light-transmitting film on the light-receiving surface side and a 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 or A structure in which at least a part of silicone is used as a sealing material between the light transmissive film and the power generation element, and the light transmissive substrate or light transmissive film or back surface protective material used on the back surface side and power generation A solar cell module having a structure in which at least a part of silicone is used as a sealing material between elements.
[2]
A solar cell module having a light-transmitting substrate or light-transmitting film on the light-receiving surface side and having no light-transmitting substrate, light-transmitting film, or back surface protective material on the back surface side, and the light-receiving surface side light-transmitting substrate Or a structure in which at least a part of silicone is used as a sealing material between the light transmissive film and the power generation element, and a structure in which at least a part of silicone is used as a sealing material on the back side of the power generation element The solar cell module characterized by being.
[3]
A solar cell module having a light-transmitting substrate or light-transmitting film on the light-receiving surface side and a 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 or A solar cell module having a structure in which at least a part of silicone is used as a sealing material between a light transmissive film and a power generation element.
[4]
A solar cell module having a light-transmitting substrate or light-transmitting film on the light-receiving surface side and having no light-transmitting substrate, light-transmitting film, or back surface protective material on the back surface side, and the light-receiving surface side light-transmitting substrate Alternatively, the solar cell module has a structure in which at least a part of silicone is used as a sealing material between the light transmissive film and the power generation element.
[5]
A solar cell module having a light-transmitting substrate or light-transmitting film on the light-receiving surface side and a light-transmitting substrate, light-transmitting film, or back surface protective material on the back surface side, and transmitting light used on the back surface side A solar cell module having a structure in which at least a part of silicone is used as a sealing material between a conductive substrate, a light transmissive film or a back surface protective material and a power generation element.
[6]
A solar cell module having a light-transmitting substrate or light-transmitting film on the light-receiving surface side and having no light-transmitting substrate, light-transmitting film, or back-surface protective material on the back surface side. A solar cell module having a structure in which at least a part of silicone is used as a stopper.
[7]
The thickness of silicone is 0.05-3 mm, The solar cell module in any one of [1]-[6] characterized by the above-mentioned.
[8]
Silicone
(A) The following average composition formula (I)
R ¹ _a SiO _{(4-a) / 2} (I)
(In the formula, 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 represented by
(B) 20-150 parts by mass of 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 [1] to [7], which is a cured product of a silicone composition containing an effective amount for curing the component (A).
[9]
A solar cell module having a light-transmitting substrate or light-transmitting film on the light-receiving surface side and a light-transmitting substrate, light-transmitting film, or back surface protective material on the back surface side, and transmitting light used on the back surface side The solar cell module is characterized in that the sealing material between the conductive substrate or the light-transmitting film or the back surface protective material and the power generation element has a structure in which at least a part of silicone containing a flame retardant imparting material is used. .
[10]
A solar cell module having a light-transmitting substrate or light-transmitting film on the light-receiving surface side and no light-transmitting substrate or light-transmitting film or back surface protection material on the back surface side, and used on the back surface side of the power generation element The solar cell module is characterized in that the sealing material to be used has a structure in which at least a part of silicone containing a flame retardancy imparting material is used.
[11]
The solar cell module according to [9] or [10], wherein the silicone containing the flame retardant imparting material has a thickness of 0.05 to 3 mm.
[12]
Silicone containing flame retardant imparting material
(A) The following average composition formula (I)
R ¹ _a SiO _{(4-a) / 2} (I)
(In the formula, 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 represented by
(B) 5 to 150 parts by mass of reinforcing silica having a specific surface area of 50 m ² / g or more,
(C) Curing agent (A) Effective amount for curing component (D) A cured product of a silicone composition containing a flame retardant imparting material, according to any one of [9] to [11] Solar cell module.
[13]
Between the light-receiving surface side light-transmitting substrate or light-transmitting film and the back surface side light-transmitting substrate or light-transmitting film or back surface protective material, at least unvulcanized silicone as a solar cell element string and a sealing material A method for producing a solar cell module, comprising: interposing a composition; heating and pressing under vacuum using a vacuum laminator; and curing the silicone composition to seal solar cell element strings.
[14]
The light-receiving surface side light-transmitting substrate or light-transmitting film is stacked with at least an unvulcanized silicone composition as a solar cell string and a sealing material, and heated and pressed under vacuum using a vacuum laminator. A method for producing a solar cell module, comprising curing the composition and sealing the solar cell element strings.
[15]
The unvulcanized silicone composition is
(A) The following average composition formula (I)
R ¹ _a SiO _{(4-a) / 2} (I)
(In the formula, 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 represented by
(B) 20-150 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 [13] or [14], which is a silicone composition containing an effective amount for curing the component (A).
[16]
The unvulcanized silicone composition is
(A) The following average composition formula (I)
R ¹ _a SiO _{(4-a) / 2} (I)
(In the formula, 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 represented by
(B) 5 to 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 [14], which is a silicone composition containing an effective amount (D) a flame retardant imparting material for curing the component (A).
[17]
The method for producing a solar cell module according to any one of [13] to [16], wherein an ethylene / vinyl acetate copolymer, polyolefin, or ionomer is further used as a sealing material.

  The solar cell module of the present invention can provide a solar cell module that is not significantly changed as a solar cell module structure, has improved flame retardancy, and is suitable for a spark test or the like.

  The solar cell module of the present invention provides a solar cell module process that is not significantly changed in the solar cell module manufacturing process, can be easily manufactured using a vacuum laminator, has improved flame retardancy, and is suitable for a spark test etc. 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. 6 is a cross-sectional view of a solar cell module of Comparative Example 1. FIG.

  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 made of a semiconductor substrate is arranged as a power generating element. The sealing material for sealing these solar cell elements can be applied to a structure in which the solar cell element is sealed on the light receiving surface side, the back surface side, or either one, and the effect is exhibited in all. .

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

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

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

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

  In this case, when the sealing material is used on the light receiving surface side of the solar cell element, for example, either EVA or silicone may be positioned on the light transmissive substrate side. Moreover, when using for a solar cell element back surface side, either 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.

  The flame retardant silicone is preferably used on the back side of the solar cell element because of its poor light transmission. In this case, either EVA or flame retardant silicone may be located on the solar cell element side.

FIGS. 1-19 shows an example of the arrangement | positioning aspect of such a sealing material. In the following examples, a light transmissive film may be used instead of the light transmissive substrate on the light receiving surface side, and a light transmissive substrate or a light transmissive film may be used instead of the back surface protective material.
FIG. 1 shows an example of the solar cell module 100 according to the first embodiment of the present invention. From a sunlight incident direction, a white glass, a sealing material silicone layer 103, and a sealing material EVA layer are used as a light transmissive substrate 101. 102. As an example of the solar cell element, a crystalline silicon solar cell element string 104, a sealing material EVA layer 102, a sealing material silicone layer 103, and a back surface protective material 106 are configured in this order. These laminates are heated and pressed under vacuum by a vacuum laminator, cross-linked and integrated. Although not shown, the solar cell module 100 formed in this way is in a completed form with its outer periphery surrounded by an aluminum frame and an electrode extraction terminal box attached to the back side.

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

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

FIG. 4 shows another example of the solar cell module 400 according to the second embodiment of the present invention. From the sunlight incident direction, a white glass, a sealing material silicone layer 103, a crystalline silicon solar as a light transmissive substrate 101 are shown. The battery element strings 104 and the sealing material silicone layer 103 are configured in this order.
3 and 4, the back surface protective material is not used, and the back surface side is in a state where the sealing material silicone layer is exposed.

  FIG. 5 shows an example of a solar cell module 500 according to the third embodiment of the present invention. From the sunlight incident direction, white glass, a sealing material silicone layer 103, and a sealing material EVA layer are used as the light transmissive substrate 101. 102, a crystalline silicon solar cell element string 104, a sealing material EVA layer 102, and a back surface protective material 106.

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

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

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

  FIG. 9 shows an example of a solar cell module 900 according to the fifth embodiment of the present invention. From the sunlight incident direction, white glass, a sealing material EVA layer 102, and a crystalline silicon solar cell element as a light transmissive substrate 101 are shown. The strings 104, the sealing material EVA layer 102, the sealing material silicone layer 103, and the back surface protective material 106 are configured in this order.

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

  FIG. 11 shows an example of a solar cell module 1100 according to the sixth embodiment of the present invention. From the sunlight incident direction, white glass, a sealing material EVA layer 102, a crystalline silicon solar cell element as a light transmissive substrate 101 is shown. The strings 104, the sealing material EVA layer 102, and the sealing material silicone layer 103 are configured in this order.

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

  FIG. 13 shows an example of the solar cell module 1300 according to the seventh embodiment of the present invention. From the sunlight incident direction, white glass, a sealing material EVA layer 102, a crystalline silicon solar cell element as a light-transmitting substrate 101 is shown. It is comprised in order of the strings 104, the sealing material EVA layer 102, the sealing material flame-retardant silicone layer 105, and the back surface protective material 106.

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

  FIG. 15 shows another example of the solar cell module 1500 according to the seventh embodiment of the present invention. In the solar light incident direction, white glass, a sealing material silicone layer 103, and a crystalline silicon solar are used as the light transmissive substrate 101. The battery element string 104, the sealing material flame-retardant silicone layer 105, and the back surface protective material 106 are configured in this order.

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

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

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

  FIG. 19 shows a solar cell module 1900, which is a comparative example of the present invention, in which white glass, a sealing material EVA layer 102, a crystalline silicon solar cell element string 104, and a sealing material are used as the light transmissive substrate 101 from the sunlight incident direction. The EVA layer 102 and the back surface protective material 106 are configured in this order.

  Here, in the 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, the EVA layer is 0.4 to 0.00 mm. 6 mm is preferred. Therefore, the thickness of the sealing material composite laminate is preferably 0.45 to 3.6 mm, particularly preferably 0.5 to 1.6 mm.

  Further, when the sealing material silicone layer is used alone as shown in FIG. 2, the thickness of the sealing material silicone layer is 0.3 to 3 mm, preferably 0.1 to 1 mm.

  Moreover, as shown in FIG. 13, FIG. 14, FIG. 15, FIG. 16, FIG. 17, and FIG. 18, when the sealant flame retardant silicone layer is used, the thickness of the flame retardant silicone layer is 0.3 to 3 mm. The thickness is 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)
(In the formula, 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.)
An organopolysiloxane having a degree of polymerization represented by 100 or more,
(B) Reinforcing silica having a specific surface area of 50 m ² / g or more,
(C) Curing agent (A) Effective amount for curing component In this case, (D) a flame retardancy-imparting material can be blended for the purpose of imparting flame retardancy.

More specifically, the component (A) is an organopolysiloxane having a degree of polymerization represented by the following average composition formula (I) of 100 or more.
R ¹ _a SiO _{(4-a) / 2} (I)
(In the formula, 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 unsubstituted or substituted monovalent hydrocarbon group, usually having 1 to 12 carbon atoms, particularly preferably having 1 to 8 carbon atoms. Are alkyl groups such as methyl, ethyl, propyl, butyl, hexyl and octyl, cycloalkyl such as cyclopentyl and cyclohexyl, alkenyl such as vinyl, allyl and propenyl, cyclo An aryl group such as an alkenyl group, a phenyl group or a tolyl group, an aralkyl group such as a benzyl group or a 2-phenylethyl group, or a group in which some or all of the hydrogen atoms of these groups are substituted with a halogen atom or a cyano group A methyl group, a vinyl group, a phenyl group, and a trifluoropropyl group are preferable, and a methyl group and a vinyl group are particularly preferable.

  Specifically, the main chain of the organopolysiloxane is composed of repeating dimethylsiloxane units, or a part of the dimethylpolysiloxane structure composed of repeating dimethylsiloxane units constituting the main chain is phenyl group, vinyl group, 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 is preferred. .

In particular, the organopolysiloxane preferably has two or more aliphatic unsaturated groups such as alkenyl groups and cycloalkenyl groups in one molecule, and particularly preferably a vinyl group. In this case, it is preferable all R ¹ in 0.01 to 20 mol%, in particular 0.02 to 10 mol% is an aliphatic unsaturated group. The aliphatic unsaturated group may be bonded to a silicon atom at the molecular chain end, or may be bonded to a silicon atom in the middle of the molecular chain, or both. It is preferably bonded to the silicon atom. Moreover, a is a positive number of 1.95 to 2.05, preferably 1.98 to 2.02, more preferably 1.99 to 2.01.

  The organopolysiloxane of component (A) is blocked with a triorganosiloxy group such as a trimethylsiloxy group, a dimethylphenylsiloxy group, a dimethylhydroxysiloxy group, a dimethylvinylsiloxy group, a methyldivinylsiloxy group, or a trivinylsiloxy group. Preferred examples can be given. Particularly preferred are methyl vinyl polysiloxane, methyl phenyl vinyl polysiloxane, methyl trifluoropropyl vinyl polysiloxane and the like.

  Such an organopolysiloxane can be obtained by, for example, hydrolyzing and condensing one or more organohalogenosilanes, or by converting a cyclic polysiloxane (siloxane trimer, tetramer, etc.) to alkaline or acidic. It can obtain by ring-opening polymerization using the 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, particularly preferably 3,000 to 20,000. This degree of polymerization can be measured as a weight average degree of polymerization in terms of polystyrene by gel permeation chromatography (GPC) analysis.

The reinforcing silica having a BET specific surface area of 50 m ² / g or more as 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, 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 the reinforcing silica as the component (B) include fumed silica (dry silica or fumed silica), precipitated silica (wet silica), and the like. Further, those whose surfaces have been subjected to a hydrophobic treatment with chlorosilane, alkoxysilane, hexamethyldisilazane, or the like are also preferably used. In particular, the treatment with hexamethyldisilazane is preferable because of high transparency. In order to improve transparency, it is preferable to use fumed silica as reinforcing silica. 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) Aerosil Co., Ltd.), Cabosil MS-5, MS-7 (Cabot Co., Ltd.), Leorosil QS-102, 103, MT-10 (Tokuyama Co., Ltd.), etc. (Ie hydrophilic or hydrophobic) fumed silica, Toxeal US-F (manufactured by Tokuyama Corporation), NIPSIL-SS, NIPSIL-LP (manufactured by Nippon Silica Industry Co., Ltd.), etc. Examples include hydrophobized precipitated silica.

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

  The curing agent for component (C) is not particularly limited as long as it can cure component (A), but (a) addition reaction (hydrosilylation reaction) type curing agent widely 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 preferable.

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

Specific examples of the organohydrogenpolysiloxane include 1,1,3,3-tetramethyldisiloxane, 1,3,5,7-tetramethylcyclotetrasiloxane, methylhydrogencyclopolysiloxane, and methylhydrogen. Siloxane / dimethylsiloxane cyclic copolymer, tris (dimethylhydrogensiloxy) methylsilane, tris (dimethylhydrogensiloxy) phenylsilane, trimethylsiloxy group-capped methylhydrogenpolysiloxane, both ends trimethylsiloxy group-capped dimethylsiloxane methyl Hydrogensiloxane copolymer, dimethylhydrogensiloxy group-capped dimethylpolysiloxane at both ends, dimethylhydrogensiloxy group-capped dimethylsiloxane methylhydride at both ends Gensiloxane copolymer, trimethylsiloxy group-capped methylhydrogensiloxane / diphenylsiloxane copolymer, trimethylsiloxy group-capped methylhydrogensiloxane / diphenylsiloxane / dimethylsiloxane copolymer, cyclic methylhydrogenpolysiloxane, Cyclic methylhydrogensiloxane / dimethylsiloxane copolymer, cyclic methylhydrogensiloxane / diphenylsiloxane / dimethylsiloxane copolymer, a copolymer comprising (CH ₃ ) ₂ HSiO _1/2 units and SiO _4/2 units, In the copolymer or the like comprising (CH ₃ ) ₂ HSiO _1/2 unit, SiO _4/2 unit and (C ₆ H ₅ ) SiO _3/2 unit, and the above exemplified compounds, part or all of methyl groups Other alkyl groups such as ethyl and propyl Examples thereof include those substituted with an aryl group such as an phenyl group.

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

  The organohydrogenpolysiloxane has a molar ratio of hydrogen atoms bonded to silicon atoms in the component (C) (that is, SiH groups) to alkenyl groups bonded to silicon atoms in the component (A) is 0.5. It is preferable to mix in an amount of -5 mol / mol, preferably 0.8-4 mol / mol, more preferably 1-3 mol / mol.

  In addition, as the hydrosilylation reaction catalyst used in the crosslinking reaction of the above (a) addition reaction (hydrosilylation reaction), known catalysts can be applied, for example, platinum black, platinum chloride, chloroplatinic acid, platinum chloride. Examples thereof include a reaction product 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, and a rhodium-based catalyst. In addition, the compounding quantity of this hydrosilylation reaction catalyst can be made into a catalytic amount, and it is usually converted into platinum group metal mass, and is based on the total mass of the components (A) and (B) and the organohydrogenpolysiloxane. It is preferably 1 to 1,000 ppm, and more preferably 5 to 100 ppm. If it is less than 1 ppm, the addition reaction may not proceed sufficiently and the curing may be insufficient, and it is uneconomical to add more than 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 include ethynylcyclohexanol and tetramethyltetravinylcyclotetrasiloxane.

  On the other hand, as (b) organic peroxide, 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. Is mentioned.

  The amount of (b) the organic peroxide added is preferably 0.1 to 15 parts by mass, particularly preferably 0.2 to 10 parts by mass with respect to 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, and it is difficult to cause a decrease in hardness or insufficient strength, and if it is within 15 parts by mass, it is preferable in terms of cost, and many decomposition products of the curing agent are generated. Therefore, it is difficult to increase discoloration of the sheet.

As the flame retardant imparting material of component (D), known materials can be used, and triazoles such as platinum compounds, carbon black, fumed titanium oxide, bengara (Fe ₂ O and Fe ₃ O ₄ ), benzotriazole and the like. A compound can be blended. This flame retardant material may be used alone or in combination of two or more. It is also possible to improve flame retardancy by relatively filling crystalline silica or aluminum oxide powder to relatively reduce the amount of siloxane component.

  Although the addition amount of (D) component is not specifically limited, 0.001-0.5 mass part with respect to a total of 100 mass parts of (A)-(C) component, More preferably, 0.002-0.05 mass Part.

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

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

  When the unvulcanized silicone composition according to the present invention is molded into a sheet, the molding method is not particularly limited, and extrusion molding, calendar molding, and the like are used. At this time, the thickness of the silicone composition sheet is preferably 0.05 to 3 mm, particularly preferably 0.1 to 1 mm.

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

  For example, as a method of laminating the unvulcanized silicone composition and EVA, in advance, both the laminated sheets are simultaneously pressed with a roll or pressed with a roll with a single layer of silicone. 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 at 120-150 degreeC for 20 to 60 minutes.

  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 light-transmitting film and the back surface-side light transmitting substrate or light-transmitting film or the back surface protective material, A solar cell element string and at least an unvulcanized silicone composition as a sealing material are interposed, and heated and pressed under vacuum using a vacuum laminator to cure the silicone composition and seal the solar cell element string. Or at least a non-vulcanized silicone composition as a solar cell string and a sealing material is stacked on the light-receiving surface side light-transmitting substrate or light-transmitting film, and heated under vacuum using a vacuum laminator And the method of curing the silicone composition to seal the solar cell element strings can be employed. In this case, as the sealing material, EVA, polyolefin or ionomer can be used in combination with the silicone composition. At this time, the solar cell element strings may be surrounded by silicone (cured product of the silicone composition), by EVA, polyolefin or ionomer, or by both silicone and EVA, polyolefin or ionomer.

  More specifically, when the solar cell module is a solar cell module having a light transmissive substrate or a light transmissive film on the light receiving surface side, for example, EVA and an unvulcanized silicone composition have a two-layer structure. The laminated body overlaid on the transparent substrate, the solar cell element strings are placed on the laminated body, and the EVA single layer or EVA and unvulcanized silicone are placed on the back surface of the solar cell element strings. After laminating the composition in a two-layer structure or a single layer of silicone and laminating a back surface protective material on the backmost side, it is heated and pressed under vacuum using a vacuum laminator. It can be modularized by crosslinking the silicone composition and EVA.

  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. 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 the 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 an organopolysiloxane comprising 99.85 mol% of dimethylsiloxane units, 0.025 mol% of methylvinylsiloxane units and 0.125 mol% of dimethylvinylsiloxane 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 were added, and the mixture was kneaded with a kneader at 170 ° C. A compound was prepared by heat treatment for 2 hours.

  For each 100 parts of the above compound, 0.5 parts / 2 of C-25A (platinum catalyst) / C-25B (organohydrogenpolysiloxane) (both manufactured by Shin-Etsu Chemical Co., Ltd.) are used as addition crosslinking curing agents. 0.0 parts were uniformly mixed with two rolls, and then a sheet of an unvulcanized silicone composition was prepared with a calender roll.

<Preparation of flame retardant silicone composition>
100 parts of an organopolysiloxane comprising 99.85 mol% of dimethylsiloxane units, 0.025 mol% of methylvinylsiloxane units and 0.125 mol% of dimethylvinylsiloxane units and having an average degree of polymerization of about 6,000, BET specific surface area 30 parts of 200 m ² / g silica (trade name Aerosil 200, manufactured by Nippon Aerosil Co., Ltd.), 4 parts of hexamethyldisilazane as a dispersant and 1.2 parts of water were added, and the mixture was kneaded with a kneader at 170 ° C. A compound was prepared by heating for 2 hours.

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

  For 100 parts of this compound, 0.5 parts / 2 of C-25A (platinum catalyst) / C-25B (organohydrogenpolysiloxane) (both manufactured by Shin-Etsu Chemical Co., Ltd.) are used as addition crosslinking curing agents. 0.0 parts were uniformly mixed with two rolls, and then a sheet of an unvulcanized silicone composition was prepared with a calender roll.

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

  The solar cell modules produced as examples and comparative examples are shown in FIGS. 2, 4 and 19 in which the sealing material silicone layer 103 and the sealing material EVA layer 102 are used alone, and the rest are sealed. The structure is a combination of different types of stop materials. Here, the sealing material EVA layer 102 has a thickness of 0.45 mm and has a sheet shape. The sealing material 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 used for the solar cell modules 100, 300, 500, 700, 900, and 1100 is a sheet shape that is integrally molded in advance. That is, the total thickness of the EVA silicone laminate is 0.95 mm.
Furthermore, the sealing material flame-retardant silicone layer 105 used in the solar cell modules 1300 and 1600 is 0.5 mm thick.

  Here, the solar cell module 100 was prepared by preparing six types of unvulcanized sealing material silicone compositions of 0.03 mm, 0.05 mm, 0.1 mm, 0.5 mm, and 1 mm, and sealing each. The stop material EVA layer 102 was integrated. Therefore, the thickness of the sealing material EVA silicone laminate is 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.
[Production of solar cell module]
[1] Production of EVA silicone laminate sheet The silicone composition was formed into a sheet by calendering. At this time, the thickness of the unvulcanized silicone composition is adjusted to 0.03 mm, 0.05 mm, 0.1 mm, 0.5 mm, 1 mm, and 3 mm, and processed and molded while attaching EVA as a base material did.
The upper surface of the unvulcanized silicone composition was formed while pressing the embossed film and protecting 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 solar cell was used.
[3] Production of Solar Cell Element (Cell) Strings The solar cell strings 104 were arranged in 60 straight sizes (6 × 10 columns), and the connection wirings were respectively connected in series and formed.
[4] Formation of Solar Cell Module The solar cell module 100 will be described as an example.
On the upper surface of the white plate glass 101, the EVA silicone composite (102, 103) was placed so that the silicone composition was oriented on the side in contact with the white plate glass 101. The solar cell strings 104 are placed on the top surface of the sealing material EVA layer 102, and the EVA silicone composite (102, 103) is placed on the top surface so that the sealing material EVA layer 102 is oriented. A protective material TPT106 was placed.
The glass / sealing material / cell sealing material / back surface protective material laminate thus obtained was heated and pressed under vacuum at 140 ° C. with a vacuum laminator to form a solar cell module. The sealing material EVA layer 102 and the sealing material silicone layer 103 were able to be laminated and sealed well without causing a visually confirmed interface or generating wrinkles or undulations. .

  The solar cell module manufactured through the above steps was completed by attaching a frame made of an aluminum alloy to the periphery, enclosing an edge seal material such as silicone, and screwing and fixing the corners of the final frame. .

Next, examples and comparative examples of the spark test are shown.
[Spring test]
Implemented based on Article 63 of the Building Standards Act.
As the brand, two wooden brands each having a size of 80 mm × 80 mm × 60 mm and a weight of 155 g were prepared for each test body and pre-cured for 24 hours or more at a temperature of 23 ± 2 ° C. and a relative humidity of 50 ± 5%.
Blowing was ensured with a blowing port height of 250 mm, a width of 1,000 mm or more, and a blowing nozzle length of 1,200 mm or more.
The burner temperature was set to 900 ± 50 ° C. at a position 60 mm from the upper end of the burner, and the brand was exposed to a flame for 240 seconds.
The solar cell module produced as described above was installed at an inclination angle of 30 ° so that the light-receiving surface side glass was on top.
Two brands were placed at designated locations on the upper surface of the solar cell module as defined in Article 63 of the Building Standards Act. The test was continued until the burning of the brand completely disappeared, and the state of the solar cell module after the burning was observed.
First, Table 1 shows the results of a spark test of a solar cell module in which the sealing material silicone layer 103 and the flame retardant silicone layer 105 are formed with a thickness of 0.5 mm. In addition, Table 2 shows the results of a spark test of a solar cell module that does not use a silicone composition as a comparative example.

As shown in Table 1, all of the solar cell modules in Table 1 were acceptable with no combustion through-holes in the state of the solar cell module after the spark test. In particular, the solar cell modules 1300, 1400, 1500, 1600, 1700, and 1800 using the flame retardant silicone layer 105 had a small burn area on the back surface of the solar cell module and high flame retardance.
As shown in Table 2, in the solar cell module 1900, in the state of the solar cell module after the spark test, a combustion through hole was generated and the brand dropped on the back surface. The through hole was 200 × 200 mm and was rejected.
This result indicates that if a silicone layer is partially present as the sealing material, it will pass the spark test.

  Table 3 shows the evaluation results obtained by changing the thickness of the sealing material silicone layer 103 in the solar cell module 100.

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-hole was not generated and the test was successful.
Moreover, in any of the pass judgments, no combustion accompanied by a flame was observed on the back surface of the solar cell module.
Further, the tip of the flame due to combustion of the test specimen did not reach the position of 600 mm on the left and right.

  On the other hand, when the thickness of the sealing material silicone layer 103 was 0.03 mm, in the spark test, the combustion through-hole was 120 × 110 mm, and a part of the brand fell on the back surface, which was rejected. The evaluation results are shown in Table 4. Therefore, the thickness of the sealing material 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, for example, a composite laminate in which silicone is applied to at least a part of EVA, polyolefin, ionomer, and the like. Thus, it is possible to provide a solar cell module suitable for a spark test.

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 string 105 Sealing material (flame retardant) silicone layer 106 Back surface protective material

Claims (17)

  A solar cell module having a light-transmitting substrate or light-transmitting film on the light-receiving surface side and a 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 or A structure in which at least a part of silicone is used as a sealing material between the light transmissive film and the power generation element, and the light transmissive substrate or light transmissive film or back surface protective material used on the back surface side and power generation A solar cell module having a structure in which at least a part of silicone is used as a sealing material between elements.   A solar cell module having a light-transmitting substrate or light-transmitting film on the light-receiving surface side and having no light-transmitting substrate, light-transmitting film, or back surface protective material on the back surface side, and the light-receiving surface side light-transmitting substrate Or a structure in which at least a part of silicone is used as a sealing material between the light transmissive film and the power generation element, and a structure in which at least a part of silicone is used as a sealing material on the back side of the power generation element The solar cell module characterized by being.   A solar cell module having a light-transmitting substrate or light-transmitting film on the light-receiving surface side and a 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 or A solar cell module having a structure in which at least a part of silicone is used as a sealing material between a light transmissive film and a power generation element.   A solar cell module having a light-transmitting substrate or light-transmitting film on the light-receiving surface side and having no light-transmitting substrate, light-transmitting film, or back surface protective material on the back surface side, and the light-receiving surface side light-transmitting substrate Alternatively, the solar cell module has a structure in which at least a part of silicone is used as a sealing material between the light transmissive film and the power generation element.   A solar cell module having a light-transmitting substrate or light-transmitting film on the light-receiving surface side and a light-transmitting substrate, light-transmitting film, or back surface protective material on the back surface side, and transmitting light used on the back surface side A solar cell module having a structure in which at least a part of silicone is used as a sealing material between a conductive substrate, a light transmissive film or a back surface protective material and a power generation element.   A solar cell module having a light-transmitting substrate or light-transmitting film on the light-receiving surface side and having no light-transmitting substrate, light-transmitting film, or back-surface protective material on the back surface side. A solar cell module having a structure in which at least a part of silicone is used as a stopper.   The thickness of silicone is 0.05-3 mm, The solar cell module of any one of Claims 1-6 characterized by the above-mentioned. Silicone
(A) The following average composition formula (I)
R ¹ _a SiO _{(4-a) / 2} (I)
(In the formula, 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 represented by
(B) 20-150 parts by mass of reinforcing silica having a specific surface area of 50 m ² / g or more,
(C) Curing agent (A) It is a hardened | cured material of the silicone composition containing the effective amount which hardens | cures a component, The solar cell module of any one of Claims 1-7 characterized by the above-mentioned.   A solar cell module having a light-transmitting substrate or light-transmitting film on the light-receiving surface side and a light-transmitting substrate, light-transmitting film, or back surface protective material on the back surface side, and transmitting light used on the back surface side The solar cell module is characterized in that the sealing material between the conductive substrate or the light-transmitting film or the back surface protective material and the power generation element has a structure in which at least a part of silicone containing a flame retardant imparting material is used. .   A solar cell module having a light-transmitting substrate or light-transmitting film on the light-receiving surface side and no light-transmitting substrate or light-transmitting film or back surface protection material on the back surface side, and used on the back surface side of the power generation element The solar cell module is characterized in that the sealing material to be used has a structure in which at least a part of silicone containing a flame retardancy imparting material is used.   The solar cell module according to claim 9 or 10, wherein the thickness of the silicone containing the flame retardant imparting material is 0.05 to 3 mm. Silicone containing flame retardant imparting material
(A) The following average composition formula (I)
R ¹ _a SiO _{(4-a) / 2} (I)
(In the formula, 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 represented by
(B) 5 to 150 parts by mass of reinforcing silica having a specific surface area of 50 m ² / g or more,
(C) Curing agent (A) An effective amount for curing the component (D) A cured product of a silicone composition containing a flame retardant imparting material, The sun according to any one of claims 9 to 11 Battery module.   Between the light-receiving surface side light-transmitting substrate or light-transmitting film and the back surface side light-transmitting substrate or light-transmitting film or back surface protective material, at least unvulcanized silicone as a solar cell element string and a sealing material A method for producing a solar cell module, comprising: interposing a composition; heating and pressing under vacuum using a vacuum laminator; and curing the silicone composition to seal solar cell element strings.   The light-receiving surface side light-transmitting substrate or light-transmitting film is stacked with at least an unvulcanized silicone composition as a solar cell string and a sealing material, and heated and pressed under vacuum using a vacuum laminator. A method for producing a solar cell module, comprising curing the composition and sealing the solar cell element strings. The unvulcanized silicone composition is
(A) The following average composition formula (I)
R ¹ _a SiO _{(4-a) / 2} (I)
(In the formula, 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 represented by
(B) 20-150 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 13 or 14, which is a silicone composition containing an effective amount for curing the component (A). The unvulcanized silicone composition is
(A) The following average composition formula (I)
R ¹ _a SiO _{(4-a) / 2} (I)
(In the formula, 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 represented by
(B) 5 to 150 parts by mass of reinforcing silica having a specific surface area of 50 m ² / g or more,
(C) Hardener (A) The manufacturing method of the solar cell module of Claim 14 which is a silicone composition containing the effective amount (D) flame retardance provision material which hardens a component.   The method for producing a solar cell module according to any one of claims 13 to 16, wherein an ethylene / vinyl acetate copolymer, a polyolefin, or an ionomer is further used as a sealing material.

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