WO2010073735A1 - 太陽電池モジュール用裏面保護シート - Google Patents
太陽電池モジュール用裏面保護シート Download PDFInfo
- Publication number
- WO2010073735A1 WO2010073735A1 PCT/JP2009/007337 JP2009007337W WO2010073735A1 WO 2010073735 A1 WO2010073735 A1 WO 2010073735A1 JP 2009007337 W JP2009007337 W JP 2009007337W WO 2010073735 A1 WO2010073735 A1 WO 2010073735A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sheet
- aluminum
- solar cell
- iron alloy
- cell module
- Prior art date
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
- H10F19/80—Encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2813—Heat or solvent activated or sealable
- Y10T428/2817—Heat sealable
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/3154—Of fluorinated addition polymer from unsaturated monomers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
Definitions
- the present invention relates to a back surface protection sheet for a solar cell module.
- This application claims priority based on Japanese Patent Application No. 2008-333656 for which it applied to Japan on December 26, 2008, and uses the content here.
- a solar cell module which is a device that converts solar light energy into electrical energy, has attracted attention as a system that can generate power without discharging carbon dioxide.
- the solar cell module is required to have high power generation efficiency and durability that can withstand long-term use even when used outdoors.
- the main configuration of the solar cell module includes a photovoltaic cell that is a photovoltaic device, a sealing material that is an electrical insulator that prevents a short circuit in an electric circuit, and a housing that encloses them in a sealed state.
- a photovoltaic cell that is a photovoltaic device
- a sealing material that is an electrical insulator that prevents a short circuit in an electric circuit
- a housing that encloses them in a sealed state.
- it is considered important to improve the performance of the housing.
- the back protective sheet for solar cell module (hereinafter sometimes referred to as a back sheet) has a high water vapor barrier. Sex is required. For this reason, conventionally, a pure aluminum metal sheet has been used as a base sheet of a back sheet. (For example, refer to Patent Document 1).
- the present invention employs the following configuration. That is, the present invention provides (1) a back surface protective sheet for a solar cell module, wherein a base sheet having electrical insulation is laminated on at least one surface of an aluminum-iron alloy sheet, (2) The back surface protective sheet for solar cell modules according to (1), wherein the iron content of the aluminum-iron alloy sheet is 0.7% by mass or more and 5.0% by mass or less, and (3) a fluororesin layer (1) or (2) characterized in that it has a back surface protective sheet for a solar cell module, (4) and further has a heat-adhesive layer. Back surface protection sheet for solar cell module.
- laminate is defined to mean joining through physical and / or chemical bonds.
- back surface protection sheet for solar cell module may be simply referred to as “back sheet”.
- FIG. 4 is a schematic view showing a configuration of a solar cell module using the backsheet of the present invention.
- the configuration of the solar cell module using the back sheet of the present invention includes a light transmissive surface layer (front layer) 10, a back surface protection sheet (back sheet) 20, and a sealing material (filling layer) 30.
- the solar battery cell 40 is included.
- the solar cell 40 and the sealing material 30 are protected from wind and rain, moisture, dust, mechanical impact, etc. It is necessary to keep the inside of the solar cell module sealed from the outside air completely.
- the back sheet 20 is required to have excellent water vapor barrier properties. Furthermore, from the viewpoint of reducing the mechanical load on the solar cell module and the structure on which the solar cell module is installed, the weight of the entire solar cell module is reduced by reducing the weight of the backsheet 20. Is also required.
- FIG. 1 is a schematic view showing a cross section of the first embodiment of the backsheet of the present invention.
- the main configuration of the back sheet according to the present invention is an aluminum-iron alloy sheet 24 and a base sheet 26 laminated on the aluminum-iron alloy sheet 24.
- the aluminum-iron alloy sheet 24 may have a two-layer structure in which the base sheet 26 is laminated only on one side (on one side), or on both sides (both sides) of the aluminum-iron alloy sheet 24.
- a three-layer structure in which the base sheet 26 is laminated may be used.
- the aluminum-iron alloy sheet 24 and the base sheet 26 may be directly laminated, or an adhesive layer 28 for adhering the two sheets is provided and laminated via the adhesive layer 28. May be. In the back sheet of the present invention, it is preferable that the aluminum-iron alloy sheet 24 and the base sheet 26 are laminated via the adhesive layer 28 from the viewpoint of improving the adhesion between the two sheets.
- the aluminum-iron alloy sheet 24 in the present invention is not particularly limited as long as the effects of the present invention are not impaired, but preferably an aluminum-iron alloy sheet containing 0.7 mass% or more of iron in sheet form More preferably, an aluminum-iron alloy containing iron in the range of 0.7 to 5.0% by mass in the form of a sheet, more preferably in the range of 1.0 to 2.0% by mass An aluminum-iron alloy containing in the form of a sheet, most preferably an aluminum-iron alloy containing iron in the range of 1.2 to 1.7% by mass in the form of a sheet.
- Examples of the aluminum-iron alloy containing iron in the most preferable range include those classified into alloy number 8021 defined in JIS H4160: 1994.
- PACAL21 (trade name) manufactured by Nihon Foil Co., Ltd. can be preferably used as the aluminum-iron alloy in the form of a sheet.
- BESPA (trade name) manufactured by Sumi Light Aluminum Foil Co., Ltd. can be preferably used.
- the effect of the present invention can be improved by using an aluminum-iron alloy sheet containing iron within the above range.
- an aluminum-iron alloy containing iron within the above range is generally superior in rolling processability compared to pure aluminum, and therefore, even when processed into a sheet having a thickness of 20 ⁇ m or less, pinholes are less likely to occur. It is considered that the gas flow through the pinhole can be suppressed, and as a result, the water vapor barrier property of the back sheet according to the present invention using the aluminum-iron alloy sheet is enhanced.
- an aluminum-iron alloy sheet containing iron within the above range generally has a higher mechanical strength than a pure aluminum sheet, the mechanical strength of the backsheet according to the present invention using the aluminum-iron alloy sheet is high.
- the aluminum-iron alloy sheet containing iron within the above range is superior in water vapor barrier property and mechanical strength as compared with the pure aluminum sheet as described above, pure aluminum is maintained while maintaining these characteristics. It is considered that the back sheet according to the present invention using the aluminum-iron alloy sheet can be reduced in weight as a result.
- the aluminum-iron alloy sheet may contain an element other than iron as long as the effects of the present invention are not impaired.
- an element other than iron for example, magnesium, manganese, copper, silicon, zinc, titanium, etc. are mentioned. These elements may be inevitably contained in the production process of the aluminum-iron alloy, but it is generally considered that the effect of the present invention is not impaired if the content is very small.
- trace amount content the case where each element is 0.5 mass% or less, respectively, More preferably, it is the case where it is 0.3 mass% or less.
- the thickness of the aluminum-iron alloy sheet is not particularly limited as long as the effects of the present invention are not impaired.
- Low pinhole occurrence frequency, high mechanical strength, high water vapor barrier property, light weight, etc. From this viewpoint, it is preferably 30 ⁇ m or less, more preferably 20 ⁇ m or less, and most preferably in the range of 5 to 10 ⁇ m.
- the substrate sheet 26 in the present invention is not particularly limited as long as it has electrical insulation and can support an aluminum-iron alloy sheet.
- the resin sheet that can be used as the base material sheet 26 one that is generally used as a resin sheet in a back sheet for a solar cell module can be used.
- seat which consists of polyester is preferable
- seat is mentioned as a more preferable thing specifically.
- the thickness of the base sheet 26 may be selected based on the electrical insulation required by the solar cell system.
- the film thickness is preferably in the range of 10 to 300 ⁇ m.
- the thickness of the PET sheet is preferably in the range of 10 to 300 ⁇ m from the viewpoint of lightness and electrical insulation, The range of 250 ⁇ m is more preferable, the range of 30 to 200 ⁇ m is more preferable, the range of 40 to 150 ⁇ m is particularly preferable, and the range of 50 to 125 ⁇ m is most preferable.
- the base material sheet 26 may be subjected to a surface modification treatment for enhancing weather resistance, moisture resistance, and the like.
- a surface modification treatment for enhancing weather resistance, moisture resistance, and the like.
- silica (SiO 2 ) and / or alumina (Al 2 O 3 ) on the PET sheet the weather resistance, moisture resistance, etc. of the back sheet can be enhanced.
- the silica and / or alumina vapor deposition treatment may be performed on both surfaces of the base material sheet 26, or only on one of the surfaces. From the viewpoint of improving the weather resistance and the like of the base sheet 26, it is preferable to perform a vapor deposition treatment of the silica and / or alumina on the surface opposite to the side where the base sheet 26 faces the solar battery cell 40. .
- the method for laminating the aluminum-iron alloy sheet 24 and the base sheet 26 in the present invention is not particularly limited as long as the effects of the present invention are not impaired, and for example, the aluminum-iron alloy sheet 24 and the above-mentioned A method in which an adhesive layer 28 is further provided between the base material sheet 26 and laminated is preferable.
- the adhesive layer 28 preferably contains an adhesive having adhesiveness to the aluminum-iron alloy sheet 24 and the base sheet 26.
- the adhesive is not particularly limited as long as the effects of the present invention are not impaired, and examples thereof include acrylic adhesives, urethane adhesives, epoxy adhesives, ester adhesives, and the like. These adhesives may be used individually by 1 type, and may be used in combination of 2 or more type.
- the surface of the aluminum-iron alloy sheet 24 on the substrate sheet side can be blasted.
- the surface of the base sheet 26 on the side of the aluminum-iron alloy sheet 24 can be subjected to corona treatment and / or chemical treatment.
- FIG. 2 is a schematic view showing a cross section of the second embodiment of the backsheet of the present invention.
- a fluororesin layer 22 in addition to the aluminum-iron alloy sheet 24 and the base sheet 26 as the configuration of the backsheet according to the present invention.
- the fluororesin layer 22 is provided in contact with a surface opposite to the surface where the aluminum-iron alloy sheet 24 is bonded to the base sheet 26. preferable.
- the fluororesin layer 22 is not particularly limited as long as it does not impair the effects of the present invention and contains fluorine.
- seat which has a fluorine-containing polymer may be sufficient, and the coating film which apply
- the coating film is preferably applied with a paint having a fluorine-containing polymer.
- the fluororesin layer 22 is a sheet having a fluorine-containing polymer
- the fluororesin layer 22 and the aluminum-iron alloy sheet are laminated in order to laminate the fluororesin layer 22 and the aluminum-iron alloy sheet 24.
- an adhesive layer 28 ' can be provided and laminated via the adhesive layer 28'.
- the description of the adhesive layer 28 ′ is the same as that of the adhesive layer 28.
- the fluororesin layer 22 is a coating film to which a paint having a fluorine-containing polymer is applied, the paint having a fluorine-containing polymer is usually removed from the aluminum-iron alloy sheet without using the adhesive layer 28 '.
- the fluororesin layer 22 can be laminated on the aluminum-iron alloy sheet 24 by directly applying to the aluminum.
- the sheet having the fluorine-containing polymer for example, a sheet obtained by processing a polymer mainly composed of polyvinyl fluoride (PVF), ethylene chlorotrifluoroethylene (ECTFE), or ethylene tetrafluoroethylene (ETFE) into a sheet shape is preferable.
- PVF polyvinyl fluoride
- ECTFE ethylene chlorotrifluoroethylene
- ETFE ethylene tetrafluoroethylene
- the thickness of the sheet having the fluorine-containing polymer is generally preferably in the range of 5 to 200 ⁇ m, more preferably in the range of 10 to 100 ⁇ m, and most preferably in the range of 10 to 50 ⁇ m from the viewpoint of weather resistance and weight reduction.
- the paint having a fluorine-containing polymer is not particularly limited as long as it can be applied by being dissolved in a solvent or dispersed in water.
- the fluorine-containing polymer that may be contained in the paint is not particularly limited as long as it does not impair the effects of the present invention and is a fluorine-containing polymer, but dissolves in the solvent (organic solvent or water) of the paint, Those that can be crosslinked are preferred.
- the fluorine-containing polymer include chlorotrifluoroethylene such as LUMIFLON (trade name) manufactured by Asahi Glass Co., Ltd., CEFRAL COAT (trade name) manufactured by Central Glass Co., Ltd., and FLUONATE (trade name) manufactured by DIC Corporation.
- CTFE polymers based on tetrafluoroethylene
- TFE tetrafluoroethylene
- examples thereof include polymers having a fluoroalkyl group such as Zonyl (trade name) manufactured by du Pont de Nemours and Company, Unidyne (trade name) manufactured by Daikin Industries, Ltd., and polymers having a fluoroalkyl unit as a main component.
- a polymer containing CTFE as a main component and a polymer containing TFE as a main component are more preferable.
- the LUMIFLON (trade name) and the ZEFFLE (trade name) are preferable.
- the LUMIFLON (trade name) is an amorphous polymer containing CTFE and several kinds of specific alkyl vinyl ethers and hydroxyalkyl vinyl ethers as main structural units.
- a polymer having a monomer unit of hydroxyalkyl vinyl ether, such as LUMIFLON (trade name) is preferable because it is excellent in solvent solubility, crosslinking reactivity, substrate adhesion, pigment dispersibility, hardness, and flexibility.
- the ZEFFLE (trade name) is a copolymer of TFE and an organic solvent-soluble hydrocarbon olefin, and in particular, when it has a hydrocarbon olefin having a highly reactive hydroxyl group, it is solvent-soluble and crosslinking reactivity. , Since it is excellent in substrate adhesion and pigment dispersibility.
- fluorine-containing polymer examples include fluoroolefin polymers having a curable functional group. Specific examples thereof include TFE, isobutylene, vinylidene fluoride (VdF), hydroxy Preferred are a copolymer composed of butyl vinyl ether and other monomers, and a copolymer composed of TFE, VdF, hydroxybutyl vinyl ether and other monomers.
- Examples of the copolymerizable monomer in the fluorine-containing polymer that may be contained in the paint include, for example, vinyl acetate, vinyl propionate, butyl butyrate, vinyl isobutyrate, vinyl pivalate, vinyl caproate, vinyl versatate, Vinyl esters of carboxylic acids such as vinyl laurate, vinyl stearate, vinyl cyclohexyl carboxylate and vinyl benzoate, alkyl vinyl ethers such as methyl vinyl ether, ethyl vinyl ether, butyl vinyl ether and cyclohexyl vinyl ether, CTFE, vinyl fluoride And fluorine-containing monomers such as (VF), VdF, and fluorinated vinyl ethers.
- vinyl acetate, vinyl propionate, butyl butyrate, vinyl isobutyrate, vinyl pivalate, vinyl caproate, vinyl versatate Vinyl esters of carboxylic acids such as vinyl laurate, vinyl stearate, vinyl cyclohexyl
- the fluorine-containing polymer that may be contained in the paint may be a polymer composed of one or more monomers or a terpolymer.
- Dyneon THV (trade name; manufactured by 3M Company), which is a terpolymer of VdF, TFE, and hexafluoropropylene.
- the Dyneon THV (trade name) is preferable because it can be produced at a relatively low temperature, can be bonded to an elastomer or a hydrocarbon-based plastic, and is excellent in flexibility and optical transparency.
- the coating material may contain a crosslinking agent, a catalyst, and a solvent, and may further contain an inorganic compound such as a pigment and a filler, if necessary.
- the solvent contained in the paint is not particularly limited as long as it does not impair the effects of the present invention.
- methyl ethyl ketone (MEK), cyclohexanone, acetone, methyl isobutyl ketone (MIBK), toluene, xylene, methanol, isopropanol, ethanol , Heptane, ethyl acetate, isopropyl acetate, n-butyl acetate, or n-butyl alcohol can be preferably used.
- the solvent has at least one of xylene, cyclohexanone, and MEK. More preferably.
- the pigment and filler that may be contained in the paint are not particularly limited as long as the effects of the present invention are not impaired.
- examples thereof include titanium dioxide, carbon black, perylene, mica, boron nitride, zinc oxide, aluminum oxide, silica, ultraviolet absorber, preservative, and desiccant. More specifically, Ti-Pure R105 (trade name; manufactured by EI du Pont de Nemours and Company), which is rutile titanium dioxide treated with silicon dioxide to provide durability, and the surface of dimethyl silicone
- a preferable example is CAB-O-SIL TS 720 (trade name; manufactured by Cabot), which is a hydrophobic silica in which the hydroxyl group on the silica surface is modified by treatment.
- the coating film is preferably cured with a crosslinking agent in order to improve weather resistance and scratch resistance.
- the crosslinking agent is not particularly limited as long as it does not impair the effects of the present invention, and examples thereof preferably include metal chelates, silanes, isocyanates, and melamines. Assuming that the back sheet is used outdoors for 30 years or more, aliphatic isocyanates are preferable as the crosslinking agent from the viewpoint of weather resistance.
- the composition of the paint is not particularly limited as long as the effects of the present invention are not impaired.
- the LUMIFLON trade name
- a pigment when the entire coating is 100% by mass, LUMIFLON (trade name) is preferably 3 to 80% by mass, more preferably 10 to 50% by mass, and the pigment is preferably 5 to 60% by mass.
- the organic solvent is more preferably 20 to 80% by mass, and more preferably 30 to 70% by mass.
- the organic solvent include a mixed solvent of MEK, xylene, and cyclohexanone.
- the catalyst include tin dibutyldilaurate, which is used to promote crosslinking of the LUMIFLON (trade name) and isocyanate in an organic solvent.
- the paint can be applied to the aluminum-iron alloy sheet 24 by a known method.
- the paint may be applied with a rod coater to a desired film thickness.
- the film thickness of the fluororesin layer 22 formed by curing the paint is not particularly limited as long as the effects of the present invention are not impaired, and may be, for example, 5 ⁇ m or more.
- the thickness of the fluororesin layer 22 is preferably 5 to 100 ⁇ m, more preferably 10 to 50 ⁇ m, further preferably 10 to 40 ⁇ m, and particularly preferably 10 to 30 ⁇ m. 10 to 20 ⁇ m is most preferable.
- the temperature in the drying process of the applied paint may be any temperature that does not impair the effects of the present invention. From the viewpoint of reducing the influence on the aluminum-iron alloy sheet 24 and the base sheet 26, a temperature of 50 to 130 ° C. It is preferable to be within a range.
- FIG. 3 is a schematic view showing a cross section of a third embodiment of the backsheet of the present invention.
- the back sheet according to the present invention preferably has a thermal adhesive layer 27 in addition to the aluminum-iron alloy sheet 24 and the base sheet 26.
- the thermal adhesive layer 27 can be laminated on the base sheet 26.
- the thermal adhesive layer 27 can be laminated on the base sheet 26.
- the surface on which the thermal adhesive layer 27 is laminated on the base sheet 26 is opposite to the surface on which the base sheet 26 is bonded to the aluminum-iron alloy sheet 24 from the viewpoint of the weather resistance of the back sheet. A surface is preferred.
- the back sheet according to the present invention has the thermal adhesive layer 27, it can be easily thermally bonded to the sealing material 30 of the solar cell module.
- the thermal adhesive layer 27 in the present invention is not particularly limited as long as it is a resin having thermal adhesiveness without impairing the effects of the present invention.
- thermal adhesiveness is a property that develops adhesiveness by heat treatment.
- the temperature in the heat treatment is usually in the range of 50 to 200 ° C.
- the resin that can be used as the thermal adhesive layer 27 for example, a resin composed of a polymer mainly composed of ethylene vinyl acetate (EVA) or polyolefin is preferable, and a resin composed of a polymer mainly composed of EVA is more preferable.
- the sealing material 30 is often a sealing resin made of EVA, and in this case, the sealing material 30 is made of the polymer mainly composed of the EVA. The compatibility and adhesion between the thermal adhesive layer 30 and the thermal adhesive layer 27 can be improved.
- the thickness of the thermal adhesive layer 27 is not particularly limited as long as the effects of the present invention are not impaired, and may be appropriately adjusted depending on the type of the thermal adhesive layer 27.
- the thickness of the thermal adhesive layer is preferably in the range of 1 to 200 ⁇ m. More specifically, when the thermal adhesive layer 27 is EVA, the thickness of the EVA is preferably in the range of 10 to 200 ⁇ m from the viewpoint of light weight and electrical insulation, It is more preferably in the range of ⁇ 150 ⁇ m, most preferably in the range of 80 to 120 ⁇ m.
- the method for laminating the thermal adhesive layer 27 and the base sheet 26 is not particularly limited as long as the effects of the present invention are not impaired, and a thermal adhesive resin dissolved in a solvent or dispersed in water. May be applied to the base material sheet, or an adhesive layer 29 may be further provided between the base material sheet 26 and the heat-adhesive layer 27 in the form of a heat-adhesive resin.
- the base sheet 26 and the heat-adhesive layer 27 can be laminated via the above.
- the adhesive layer 29 includes an adhesive having adhesiveness to the thermal adhesive layer 27 and the base sheet 26.
- the adhesive is not particularly limited as long as it does not impair the effects of the present invention, and examples thereof include acrylic adhesives, urethane adhesives, epoxy adhesives, and ester adhesives.
- the surface of the thermal adhesive layer 27 and the base sheet 26 on the adhesive layer 29 side can be subjected to corona treatment and / or chemical treatment.
- the back sheet according to the present invention has a multilayer structure as described above, and the resin, sheet, adhesive, and paint (coating film) that can constitute each layer are pigments unless the effects of the present invention are impaired. And may contain a filler. Examples of the pigment and filler include the same pigments and fillers that may be included in the paint.
- the sealing material 30 can be protected from wind and rain, moisture, dust, mechanical shock, etc., and the inside of the solar cell module can be completely shielded from the outside air and kept in a sealed state.
- the aluminum-iron alloy sheet 24 side of the backsheet 20 may be laminated on the sealing surface, or the base sheet of the backsheet 20 The 26 side may be laminated on the sealing surface.
- a known method can be applied as the lamination method.
- Example 1 7 ⁇ m thick aluminum-iron alloy sheet (iron content 1.2-1.7% by mass; aluminum-iron alloy sheet equivalent to alloy number 8021 defined in JISH4160: 1994; PACAL21 (trade name; Japan) Foil Manufacturing Co., Ltd.)) and a PET sheet with a thickness of 100 ⁇ m are laminated by a known dry lamination method using a urethane-based adhesive to produce a back sheet having a three-layer structure including the adhesive layer. did. A pinhole inspection was performed on the backsheet. The results are shown in Table 1.
- Example 2 to 5 A back sheet was manufactured in the same manner as in Example 1 except that the thickness of the aluminum-iron alloy sheet was changed to 9, 11, 15, and 20 ⁇ m, respectively, and a pinhole inspection was performed. The results are shown in Table 1.
- Example 1 A pure aluminum sheet having a thickness of 7 ⁇ m (a sheet of pure aluminum equivalent to alloy number 1N30 defined in JIS H4160: 1994) and a PET sheet having a thickness of 100 ⁇ m are known using the adhesive described in Example 1. A back sheet having a three-layer structure including the adhesive layer was manufactured for comparison, and a pinhole inspection was performed on the back sheet, and the results are shown in Table 1. .
- the back sheet according to the present invention has a smaller number of pinholes than the conventional back sheet using a pure aluminum sheet having the same thickness. It is clear that it is excellent. In addition, it is clear that the aluminum sheet can be made thinner than the conventional back sheets (Comparative Examples 1 to 5) while maintaining the same number of pinholes (water vapor barrier property). That is, it is clear that the back sheet according to the present invention is superior in light weight than the conventional one.
- Example 6 7 ⁇ m thick aluminum-iron alloy sheet (iron content is 1.2 to 1.7% by mass; aluminum-iron alloy sheet equivalent to alloy number 8021 defined in JIS H4160: 1994; PACAL21 (trade name; Nippon Foil Co., Ltd.)) and a PET sheet having a thickness of 250 ⁇ m were laminated by a known dry lamination method using the adhesive described in Example 1.
- an EVA sheet having a thickness of 100 ⁇ m is coated on the other side of the PET sheet (opposite to the side on which the aluminum-iron alloy sheet is laminated) by the known dry lamination method using the adhesive described in Example 1.
- a back sheet having a five-layer structure including the adhesive layer was manufactured.
- a partial discharge test was performed on the backsheet. The results are shown in Table 2.
- Example 7 to 10 A back sheet was manufactured in the same manner as in Example 6 except that the thickness of the PET sheet was changed to 125, 100, 75, and 50 ⁇ m, respectively, and a partial discharge test was performed. The results are shown in Table 2.
- Example 11 Aluminum-iron alloy sheet having a thickness of 17.5 ⁇ m (iron content is 1.2 to 1.7% by mass; aluminum-iron alloy sheet equivalent to alloy number 8021 defined in JISH4160: 1994; PACAL21 (trade name) Manufactured by Nippon Foil Co., Ltd.) and a PET sheet having a thickness of 75 ⁇ m were laminated by a known dry lamination method using the adhesive described in Example 1. Next, an EVA sheet having a thickness of 100 ⁇ m is coated on the other side of the PET sheet (opposite to the side on which the aluminum-iron alloy sheet is laminated) by the known dry lamination method using the adhesive described in Example 1. Layer).
- a coating film having a fluorine-containing polymer is formed on the other surface of the aluminum-iron alloy sheet (the surface opposite to the surface on which the PET sheet is laminated), and has a six-layer structure including the adhesive layer.
- a backsheet was produced.
- a partial discharge test was performed on the backsheet. The results are shown in Table 2.
- the method for forming the coating film having the fluorine-containing polymer is as follows. To 200 g of LUMIFLON LF200 (solid content 60%) manufactured by Asahi Glass Co., Ltd. I. 76.2 g of titanium dioxide Ti-Pure R105 manufactured by du Pont de Nemours and Company was added and mixed with a mixer having a high shearing force. To the mixed solution, 21.4 g of Desmodur N3300 (trade name; aliphatic isocyanate), a crosslinking agent manufactured by Bayer Material Science, was added and mixed. The obtained paint having a fluorine-containing polymer was applied onto the aluminum-iron alloy sheet using a rod coater, and then dried at 80 ° C. to form a coating film having a thickness of 13 ⁇ m.
- Example 12 In Example 11, instead of forming a coating film having a fluorine-containing polymer, a sheet Fluon ETFE (trade name; manufactured by Asahi Glass Co., Ltd., thickness 25 ⁇ m) having a fluorine-containing polymer was used. Then, a 7-layer back sheet including the adhesive layer was manufactured by laminating by a known dry lamination method. A partial discharge test was performed on the backsheet. The results are shown in Table 2.
- Reference Example 2 A back sheet was produced in the same manner as in Reference Example 1 except that the thickness of the PET sheet was changed to 50 ⁇ m. A partial discharge test was performed on the backsheet. The results are shown in Table 2.
- the partial discharge start voltage specified in IEC 61730-2 was measured according to IEC606664-1. At that time, a partial discharge tester KPD2050 manufactured by Kikusui Electronics Corporation was used.
- the present invention can be applied to the provision of a back surface protection sheet for a solar cell module that is excellent in light weight and water vapor barrier properties.
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Abstract
Description
本願は、2008年12月26日に、日本に出願された特願2008-333656号に基づき優先権を主張し、その内容をここに援用する。
太陽電池モジュールの主な構成は、光発電素子である太陽電池セル、電気回路のショートを防ぐ電気絶縁体である封止材、およびそれらを密閉状態で内包する筐体からなる。一般に、太陽電池モジュールの耐久性を高めるためには、筐体を高性能化することが重要であると考えられている。
本発明は、上記事情に鑑みてなされたものであって、軽量性、水蒸気バリア性に優れる太陽電池モジュール用裏面保護シートを提供することを課題とする。
すなわち、本発明は、(1)アルミニウム-鉄合金シートの少なくとも一方の面に電気絶縁性を有する基材シートを積層してなることを特徴とする太陽電池モジュール用裏面保護シート、(2)前記アルミニウム-鉄合金シートの鉄含有量が0.7質量%以上5.0質量%以下であることを特徴とする(1)記載の太陽電池モジュール用裏面保護シート、(3)さらにフッ素樹脂層を有することを特徴とする(1)または(2)記載の太陽電池モジュール用裏面保護シート、(4)さらに熱接着性層を有することを特徴とする(1)~(3)のいずれかに記載の太陽電池モジュール用裏面保護シート。
図4は、本発明のバックシートを用いる太陽電池モジュールの構成を示した模式図である。
図4に例示するように、本発明のバックシートを用いる太陽電池モジュールの構成は、光透過性表面層(フロント層)10、裏面保護シート(バックシート)20、封止材(充填層)30、太陽電池セル40を有する。屋外および屋内において長期間の使用に耐えうる耐候性および耐久性を太陽電池モジュールにもたせるためには、太陽電池セル40および封止材30を風雨、湿気、砂埃、機械的な衝撃などから守り、太陽電池モジュールの内部を外気から完全に遮断して密閉した状態に保つことが必要である。このため、前記バックシート20には、水蒸気バリア性に優れていることが求められる。さらには、太陽電池モジュールおよび該太陽電池モジュールを設置する構造物への機械的な負荷を低減する観点から、前記バックシート20を軽量化することによって、太陽電池モジュール全体の重量を軽量化することも求められる。
図1に例示するように、本発明にかかるバックシートの主な構成は、アルミニウム-鉄合金シート24と、該アルミニウム-鉄合金シート24に積層する基材シート26である。
前記アルミニウム-鉄合金シート24の一方の面に(片面に)だけ前記基材シート26が積層した2層構造であってもよいし、前記アルミニウム-鉄合金シート24の両方の面(両面)に前記基材シート26が積層した3層構造であってもよい。
前記接着剤としては、本発明の効果を損なわないものであれば特に制限されず、例えばアクリル系接着剤、ウレタン系接着剤、エポキシ系接着剤、エステル系接着剤などが挙げられる。これらの接着剤は1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
図2に例示するように、本発明にかかるバックシートの構成として、前記アルミニウム-鉄合金シート24および前記基材シート26に加えて、フッ素樹脂層22を設けることが好ましい。該フッ素樹脂層22を設けることにより、本発明にかかるバックシートの耐候性を向上させることができる。
前記フッ素樹脂層22は、前記アルミニウム-鉄合金シートの腐食を防ぐ観点から、前記アルミニウム-鉄合金シート24が前記基材シート26に接合している面とは反対の面に接して設けることが好ましい。
前記ZEFFLE(商品名)は、TFEと有機溶媒可溶性の炭化水素オレフィンとの共重合体であり、なかでも反応性の高い水酸基を備えた炭化水素オレフィンを有する場合には、溶剤可溶性、架橋反応性、基材密着性、および顔料分散性に優れるので好ましい。
前記有機溶媒としては、MEKとキシレンとシクロヘキサノンとの混合溶媒が例示できる。また、前記触媒としては、ジブチルジラウリン酸スズを例示でき、有機溶媒中で前記LUMIFLON(商品名)とイソシアネートとの架橋を促進するために用いられる。
前記塗料が硬化して形成される前記フッ素樹脂層22の膜厚としては、本発明の効果を損なわない限り特に限定されず、例えば5μm以上の膜厚とすればよい。水蒸気バリア性、耐候性および軽量性の観点から、該フッ素樹脂層22の膜厚としては、5~100μmが好ましく、10~50μmがより好ましく、10~40μmがさらに好ましく、10~30μmが特に好ましく、10~20μmが最も好ましい。
図3に例示するように、本発明にかかるバックシートの構成として、前記アルミニウム-鉄合金シート24および基材シート26に加えて、熱接着性層27を有することが好ましい。該熱接着性層27は前記基材シート26に積層することができる。
また、前記アルミニウム-鉄合金シート24、前記基材シート26、および前記フッ素樹脂層22に加えて、熱接着性層27を有することが好ましい。前記熱接着性層27は前記基材シート26に積層することができる。
前記熱接着性層27を前記基材シート26に積層させる面は、該バックシートの耐候性の観点から、前記基材シート26が前記アルミニウム-鉄合金シート24に接合している面の反対の面であることが好ましい。
本発明にかかるバックシートが前記熱接着性層27を有することによって、太陽電池モジュールの封止材30に対して容易に熱接着することができる。
前記バックシート20を前記封止面に積層させる場合、前記バックシート20の前記アルミニウム-鉄合金シート24の側を前記封止面に積層させてもよいし、前記バックシート20の前記基材シート26の側を前記封止面に積層させてもよい。該積層方法としては、公知の方法を適用することができる。
厚さ7μmのアルミニウム-鉄合金シート(鉄含有量は1.2~1.7質量%;JISH4160:1994に規定される合金番号8021と同等のアルミニウム-鉄合金のシート;PACAL21(商品名;日本製箔株式会社製))と厚さ100μmのPETシートとを、ウレタン系接着剤を用いて、公知のドライラミネーション法によって積層し、該接着剤の層を含めた3層構造のバックシートを製造した。該バックシートに対して、ピンホール検査を行った。その結果を表1に示す。
アルミニウム-鉄合金シートの厚さを9,11,15,20μmにそれぞれ変更した以外は上記実施例1と同様にバックシートを製造し、ピンホール検査を行った。その結果を表1に示す。
厚さ7μmの純アルミニウムシート(JIS H4160:1994に規定される合金番号1N30と同等の純アルミニウムのシートと厚さ100μmのPETシートとを、実施例1に記載の接着剤を用いて、公知のドライラミネーション法によって積層し、該接着剤の層を含めた3層構造のバックシートを比較のために製造した。該バックシートに対して、ピンホール検査を行った。その結果を表1に示す。
純アルミニウムシートの厚さを9,11,15,20μmにそれぞれ変更した以外は上記比較例1と同様にバックシートを比較のために製造し、ピンホール検査を行った。その結果を表1に示す。
また、ピンホールの数(水蒸気バリア性)を同程度にしながら、従来のバックシート(比較例1~5)よりも該アルミニウムシートを薄くしうることが明らかである。すなわち、本発明にかかるバックシートは従来よりも軽量性に優れることが明らかである。
厚さ7μmのアルミニウム-鉄合金シート(鉄含有量は1.2~1.7質量%;JIS H4160:1994に規定される合金番号8021と同等のアルミニウム-鉄合金のシート;PACAL21(商品名;日本製箔株式会社製))と厚さ250μmのPETシートとを、実施例1に記載の接着剤を用いて、公知のドライラミネーション法によって積層した。つぎに、厚さ100μmのEVAシートを実施例1に記載の接着剤を用いて、公知のドライラミネーション法によって、前記PETシートのもう一方の面(アルミニウム-鉄合金シートを積層した面とは反対の面)に積層し、前記接着剤の層を含めた5層構造のバックシートを製造した。該バックシートに対して、部分放電試験を行った。その結果を表2に示す。
PETシートの厚さを125,100,75,50μmにそれぞれ変更した以外は上記実施例6と同様にバックシートを製造し、部分放電試験を行った。その結果を表2に示す。
厚さ17.5μmのアルミニウム-鉄合金シート(鉄含有量は1.2~1.7質量%;JISH4160:1994に規定される合金番号8021と同等のアルミニウム-鉄合金のシート;PACAL21(商品名;日本製箔株式会社製))と厚さ75μmのPETシートとを、実施例1に記載の接着剤を用いて、公知のドライラミネーション法によって積層した。
つぎに、厚さ100μmのEVAシートを実施例1に記載の接着剤を用いて、公知のドライラミネーション法によって、前記PETシートのもう一方の面(アルミニウム-鉄合金シートを積層した面とは反対の面)に積層した。さらに、フッ素含有ポリマーを有する塗膜を前記アルミニウム-鉄合金シートのもう一方の面(PETシートを積層した面とは反対の面)に形成し、前記接着剤の層を含めた6層構造のバックシートを製造した。該バックシートに対して、部分放電試験を行った。その結果を表2に示す。
旭硝子株式会社製のLUMIFLON LF200(固形分60%)200gに、E.I.du Pont de Nemours and Company社製の二酸化チタンであるTi-Pure R105を76.2g加えて、高いせん断力をもつミキサーで混合した。その混合溶液にBayer Material Science社製の架橋剤であるDesmodur N3300(商品名;脂肪族イソシアネート)を21.4g加えて混合した。得られたフッ素含有ポリマーを有する塗料を前記アルミニウム-鉄合金シート上に、ロッドコーターを用いて塗布した後、80℃で乾燥させて厚さ13μmの塗膜を形成した。
実施例11において、フッ素含有ポリマーを有する塗膜を形成することに代えて、フッ素含有ポリマーを有するシート Fluon ETFE (商品名;旭硝子社製 厚さ25μm)を実施例1に記載の接着剤を用いて、公知のドライラミネーション法によって積層することにより、前記接着剤の層を含めた7層構造のバックシートを製造した。該バックシートに対して、部分放電試験を行った。その結果を表2に示す。
厚さ125μmのPETシートと厚さ100μmのEVAシートとを実施例1に記載の接着剤を用いて、公知のドライラミネーション法によって積層し、該接着剤の層を含めた3層構造のバックシートを参考例として製造した。該バックシートに対して、部分放電試験を行った。その結果を表2に示す。
前記PETシートの厚さを50μmに変更した以外は前記参考例1と同じ方法で、バックシートを製造した。該バックシートに対して、部分放電試験を行った。その結果を表2に示す。
前記100μmのEVAシートに対して、部分放電試験を行った。その結果を表2に示す。
20 …裏面保護シート
22 …フッ素樹脂層
24 …アルミニウム-鉄合金シート
26 …基材シート
27 …熱接着性層
28 …接着層
29 …接着層
30 …封止材
40 …太陽電池セル
Claims (4)
- アルミニウム-鉄合金シートの少なくとも一方の面に電気絶縁性を有する基材シートを積層してなることを特徴とする太陽電池モジュール用裏面保護シート。
- 前記アルミニウム-鉄合金シートの鉄含有量が0.7質量%以上5.0質量%以下であることを特徴とする請求項1に記載の太陽電池モジュール用裏面保護シート。
- さらにフッ素樹脂層を有することを特徴とする請求項1または2に記載の太陽電池モジュール用裏面保護シート。
- さらに熱接着性層を有することを特徴とする請求項1~3のいずれか1項に記載の太陽電池モジュール用裏面保護シート。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US13/141,186 US20110256392A1 (en) | 2008-12-26 | 2009-12-28 | Protective sheet for back surface of solar cell module |
CN2009801526596A CN102265408A (zh) | 2008-12-26 | 2009-12-28 | 太阳能电池组件用背面保护片 |
JP2010543929A JPWO2010073735A1 (ja) | 2008-12-26 | 2009-12-28 | 太陽電池モジュール用裏面保護シート |
EP09834541A EP2372782A4 (en) | 2008-12-26 | 2009-12-28 | PROTECTIVE FOIL FOR THE BACK OF A SOLAR CELL MODULE |
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JP2008333656 | 2008-12-26 | ||
JP2008-333656 | 2008-12-26 |
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PCT/JP2009/007337 WO2010073735A1 (ja) | 2008-12-26 | 2009-12-28 | 太陽電池モジュール用裏面保護シート |
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US (1) | US20110256392A1 (ja) |
EP (1) | EP2372782A4 (ja) |
JP (1) | JPWO2010073735A1 (ja) |
CN (1) | CN102265408A (ja) |
TW (1) | TW201034218A (ja) |
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WO2012004849A1 (ja) * | 2010-07-05 | 2012-01-12 | リケンテクノス株式会社 | コーティング組成物および積層体 |
WO2012026414A1 (ja) * | 2010-08-23 | 2012-03-01 | リンテック株式会社 | 透明保護シートおよびこれを用いた太陽電池モジュール |
JP2012164719A (ja) * | 2011-02-04 | 2012-08-30 | Toyo Ink Sc Holdings Co Ltd | 太陽電池用裏面保護シート、及び太陽電池モジュール |
EP2673808A1 (de) * | 2011-02-09 | 2013-12-18 | Dunmore Europe GmbH | Solarmodul mit einer mehrlagigen rückseitenfolie, in deren verklebung pigmente eingelagert sind |
EP2695624A1 (en) * | 2009-12-16 | 2014-02-12 | Avery Dennison Corporation | Photovoltaic Backsheet |
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Publication number | Priority date | Publication date | Assignee | Title |
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US8507029B2 (en) * | 2007-02-16 | 2013-08-13 | Madico, Inc. | Backing sheet for photovoltaic modules |
US9735298B2 (en) * | 2007-02-16 | 2017-08-15 | Madico, Inc. | Backing sheet for photovoltaic modules |
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- 2009-12-28 EP EP09834541A patent/EP2372782A4/en not_active Withdrawn
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EP2695624A1 (en) * | 2009-12-16 | 2014-02-12 | Avery Dennison Corporation | Photovoltaic Backsheet |
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JP2012164719A (ja) * | 2011-02-04 | 2012-08-30 | Toyo Ink Sc Holdings Co Ltd | 太陽電池用裏面保護シート、及び太陽電池モジュール |
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EP2712730A2 (en) * | 2011-05-17 | 2014-04-02 | Youl Chon Chemical Co. Ltd. | Back sheet for a solar cell module, and solar cell module comprising the same |
EP2712730A4 (en) * | 2011-05-17 | 2015-04-15 | Youl Chon Chemical Co Ltd | Backsheet for a solar cell module and solar cell module with it |
US9136414B2 (en) | 2011-05-17 | 2015-09-15 | Youl Chon Chemical Co., Ltd. | Back sheet for a solar cell module, and solar cell module comprising same |
WO2023126147A1 (en) | 2021-12-29 | 2023-07-06 | Rec Solar Pte. Ltd. | Solar module |
Also Published As
Publication number | Publication date |
---|---|
EP2372782A4 (en) | 2013-03-27 |
TW201034218A (en) | 2010-09-16 |
CN102265408A (zh) | 2011-11-30 |
JPWO2010073735A1 (ja) | 2012-06-14 |
EP2372782A1 (en) | 2011-10-05 |
US20110256392A1 (en) | 2011-10-20 |
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