Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/40—Additives
  • C09D7/60—Additives non-macromolecular
  • C09D7/61—Additives non-macromolecular inorganic
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
  • C08J7/04—Coating
  • C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
  • C08J7/04—Coating
  • C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
  • C09D183/02—Polysilicates
• • 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
• • 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
  • H10F19/85—Protective back sheets
• • 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
  • H10F77/00—Constructional details of devices covered by this subclass
  • H10F77/50—Encapsulations or containers
• • 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

Definitions

• the present invention relates to a method for producing a solar cell module that can withstand use in a severe outdoor environment for a long period of time and is excellent in adhesion and weather resistance to a silicone encapsulant, a solar cell backside sealing sheet, and a solar cell module It is.
• Solar cells used for photovoltaic power generation constitute the heart of a photovoltaic power generation system that directly converts sunlight energy into electrical energy, and are made of semiconductors such as silicon.
• solar cell elements hereinafter referred to as cells
• a unit incorporated in this package is called a solar cell module, and generally has a structure in which the surface exposed to sunlight is covered with glass, the gap is filled with a sealing material made of a thermoplastic resin, and the back surface is protected with a sealing sheet. ing. Therefore, the solar cell module is generally configured by laminating glass, a sealing material layer including cells, and a back surface sealing sheet in this order.
• EVA resin ethylene-vinyl acetate copolymer resin
• EVA resin ethylene-vinyl acetate copolymer resin
• silicone resin takes time for thermosetting when sealing cells, and there is a risk of discoloration when exposed to ultraviolet rays for a long time, it is often mixed with an ultraviolet absorber. Since it is limited, there is a problem that power generation efficiency is suppressed.
• Silicone is an example of a sealing material that compensates for such problems. Since silicone has excellent environmental resistance and light transmittance, there is a possibility that power generation efficiency can be improved as compared with the case where EVA resin is used. Further, by using liquid silicone having thermosetting property, it can be thermoset in a shorter time than EVA resin, which contributes to the improvement of productivity of the solar cell module.
• the back side sealing sheet has mechanical strength, heat resistance, water resistance, chemical resistance, light reflectivity, water vapor barrier property, thermal adhesiveness with sealing material, design, and for mounting the outermost terminal box Not only properties such as adhesive strength with silicone resins are required, but also excellent weather resistance is required due to exposure to ultraviolet light.
• a white polyvinyl fluoride film (DuPont, trade name: “Tedlar” (registered trademark)) can be exemplified, and the film is a polyester film.
• a backside sealing sheet having a laminated structure in which sandwiches are sandwiched is widely used in such applications.
• Patent Document 1 a configuration in which a polyester film excellent in weather resistance and gas barrier properties is laminated can be exemplified.
• Patent Document 2 JP 2002-026354 A (paragraphs [0008] to [0010]) JP 2003-060218 A (paragraphs [0008] to [0010])
• thermo adhesive layer hot melt adhesive layer
• styrene / olefin copolymer resin disclosed in Patent Document 2 is improved in adhesive strength, but it cannot be said that the strength is sufficient. There was also concern about the durability.
• the backside sealing sheet film has poor adhesiveness with silicone, and therefore, it is necessary to develop a new backside sealing sheet suitable for the silicone sealing material.
• the back surface sealing sheet of the structure in which the polyester film is sandwiched between the polyvinyl fluoride films is excellent in weather resistance, it is expensive, so that it is an obstacle in terms of reducing the cost of the solar cell module.
• An object of the present invention is to provide a solar cell module manufacturing method, a solar cell back surface sealing sheet, and a solar cell module, which are capable of overcoming the above problems and having excellent adhesion and weather resistance to a silicone sealing material.
• the manufacturing method of the solar cell module of the present invention has the following configuration in order to solve this problem. That is, A coating containing at least one of a silicate hydrolysis product and silica fine particles is applied to at least one surface of a base film to form a silicon oxide layer, and the silicon oxide layer and the silicone sealing material layer are bonded to each other. A method for manufacturing a solar cell module.
• the solar cell back surface sealing sheet of this invention has the following structure, in order to solve this subject. That is, A solar cell backside sealing sheet having a silicon oxide layer formed by coating a coating containing at least one of a silicate hydrolysis product and silica fine particles on at least one side of a base film.
• the solar cell module of the present invention has the following configuration. That is, A solar cell module in which the silicon oxide layer and the silicone sealing material layer are directly laminated.
• the silicate is preferably butyl silicate.
• the base film contains an inorganic pigment.
• the base film has a resin layer containing an ultraviolet absorber on the surface opposite to the surface on which the silicon oxide layer is formed.
• the base film has a resin layer containing an ultraviolet absorber, and the surface on which the silicon oxide layer is formed is the resin layer side.
• the manufacturing method of a solar cell module excellent in the adhesive force with respect to a silicone sealing material and the weather resistance which can be used in the severe outdoor environment for a long term, a solar cell backside sealing sheet, and a solar cell module Is obtained.
• a coating containing at least one of a silicate hydrolysis product and silica fine particles is applied to at least one surface of a base film to form a silicon oxide layer, The physical layer and the silicone sealing material layer are adhered to each other.
• an excellent adhesive force between the base film and the silicone sealing material layer can be obtained, and further, a solar cell module having excellent weather resistance can be obtained.
• Base film In the solar cell backside sealing sheet of the present invention, various resin films can be used as the base film when forming the silicon oxide layer disposed on the surface in contact with the silicone sealing material layer.
• polyester resin films such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), resin films such as polycarbonate, polymethyl methacrylate, polyacrylate, polypropylene, and polyethylene, and resin films obtained by mixing these resins. It is done. Among them, a polyester resin film is preferable because it is excellent in strength, dimensional stability, and thermal stability, and a polyethylene terephthalate film such as PET or PEN is particularly preferable because it is inexpensive.
• the polyester resin may be a copolymer.
• copolymer component examples include diol components such as propylene glycol, diethylene glycol, neopentyl glycol, and cyclohexane dimethanol, isophthalic acid, adipic acid, azelaic acid, and sebacin.
• diol components such as propylene glycol, diethylene glycol, neopentyl glycol, and cyclohexane dimethanol, isophthalic acid, adipic acid, azelaic acid, and sebacin.
• the dicarboxylic acid component of an acid and its ester-forming derivative can be used.
• the solar cell backside sealing sheet of the present invention is preferably a resin film excellent in hydrolysis resistance, that is, a hydrolysis resistance film as a base film from the viewpoint of being used in an environment where it is directly exposed to the outside air.
• a polyester resin film is formed using a so-called polymer obtained by condensation polymerization of monomers as a raw material, and contains about 1.5 to 2% by mass of an oligomer positioned between the monomer and the polymer.
• a typical oligomer is a cyclic trimer, and a film with a high content of it causes a decrease in mechanical strength, cracks, breakage of materials, etc. due to the progress of hydrolysis due to rainwater, etc. during long-term exposure such as outdoors. .
• a polyester resin film is formed from a polyester resin having a cyclic trimer content obtained by polymerization by a solid phase polymerization method of 1.0% by mass or less.
• the cyclic trimer content is measured by, for example, measuring the content (% by mass) relative to the resin mass by measuring by liquid chromatography using a solution obtained by dissolving 100 mg of a polymer in 2 mL of orthochlorophenol. Is required.
• the resin film constituting the solar cell backside sealing sheet if necessary, for example, an antistatic agent, an ultraviolet absorber, a stabilizer, an antioxidant, a plasticizer, a lubricant, a filler, a coloring pigment, etc.
• an antistatic agent for example, an ultraviolet absorber, a stabilizer, an antioxidant, a plasticizer, a lubricant, a filler, a coloring pigment, etc.
• Resin films and the like in which additives are added within a range not impairing the effects of the present invention can also be used.
• resin films to which additives are added include polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), resin films such as polycarbonate, polymethyl methacrylate, polyacrylate, polypropylene, and polyethylene, and the like. And a white film obtained by forming a resin raw material in which a white pigment is kneaded into a resin film in which the above resin is mixed.
• the white pigment inorganic pigments such as titanium oxide and zinc oxide can be preferably used. By kneading, a white film having a whiteness of 80% or more and an opacity of 80% or more can be obtained.
• the white film is used for the purpose of assisting energy conversion in the semiconductor element by reflecting the light incident on the back sheet, and is preferably arranged in a layer close to the cell.
• a white film preferably used as a base film is used for reflecting sunlight to improve power generation efficiency.
• a polyester resin film such as PET or PEN is preferable because of its excellent strength, dimensional stability, and thermal stability, and a polyethylene terephthalate film is particularly preferable because of its low cost.
• the polyester resin constituting the polyester resin film is composed of polyethylene terephthalate in which 80 mol% or more of the structural unit is ethylene terephthalate, polyethylene naphthalate in which 80 mol% or more of the structural unit is ethylene naphthalate, Although represented by a polylactic acid film or the like in which 80 mol% or more of the unit is polylactic acid, it is not particularly limited.
• the polyester resin may be a copolymer.
• the copolymer component include diol components such as propylene glycol, diethylene glycol, neopentyl glycol, and cyclohexane dimethanol, isophthalic acid, adipic acid, azelaic acid, and sebacin.
• the dicarboxylic acid component of an acid and its ester-forming derivative can be used.
• the thickness of the resin film for the solar cell backside sealing sheet is not particularly limited, but is preferably in the range of 1 to 250 ⁇ m in view of the voltage resistance characteristics, cost, etc. of the sealing sheet.
• the base film may be a water vapor barrier film in which at least one inorganic oxide layer is formed by vapor deposition for the purpose of imparting water vapor barrier properties.
• the “water vapor barrier film” in the present invention is a resin film having a water vapor transmission rate of 5 g / (m 2 ⁇ day) or less as measured by the method B described in JIS K 7129 (2000).
• As the water vapor barrier film at least one metal thin film layer or inorganic layer is formed on at least one surface of a polyester resin film such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) or an olefin film such as polypropylene by vapor deposition or the like.
• a film provided with an oxide layer is mentioned, since the solar cell backside sealing sheet is required to have high electrical insulation, it is not an electrically conductive metal thin film layer, but an inorganic oxide layer. Is preferred.
• the gas barrier property of a film provided with an inorganic oxide layer by vapor deposition or the like is caused by at least the thermal dimensional stability of a polyester resin film as a base material. Therefore, a polyester resin film is a film stretched in a biaxial direction. Preferably there is.
• the resin film may be subjected to surface treatment such as discharge treatment such as corona discharge or plasma discharge, or acid treatment, if necessary.
• a weather resistance / ultraviolet blocking resin layer which will be described later, may be laminated on the resin film as necessary.
• a coating containing at least one of a silicate hydrolysis product and silica fine particles is applied to at least one surface of the above-described base film to form a silicon oxide layer.
• the silicate ethyl silicate, propyl silicate, and butyl silicate are preferable, and butyl silicate is more preferable.
• the paint used at this time can be dissolved in a solvent such as isopropyl alcohol, n-butyl alcohol, toluene and the like, and the silicon oxide layer can be formed by coating and drying.
• the silicon oxide layer thus formed functions as an easy adhesion layer for the sealing material.
• the silicon oxide layer is preferably bonded to the silicone encapsulant layer in a thermocompression bonding process when forming the solar cell module, and the adhesive strength is required to be maintained even in an environment where it is exposed outdoors for a long time. Is done. Therefore, the easy-adhesion layer for the sealing material is preferably a weather-resistant material, and a silicon oxide layer is preferably applied from this viewpoint.
• the thickness of the silicon oxide layer in the present invention is not particularly limited, but is preferably in the range of 0.05 to 0.4 ⁇ m in consideration of productivity and cost.
• the method for forming the silicon oxide layer on the base film is not particularly limited, and various known coating techniques can be used. For example, a roll coating method, a dip coating method, a bar coating method, a die coating method, a gravure roll coating method, or a combination of these methods can be used. Among them, the gravure roll coating method is a preferable method because it increases the stability of the coating layer forming composition.
• the coating liquid containing the silicon oxide according to the present invention includes a heat stabilizer, an antioxidant, a strengthening agent, a deterioration preventing agent, a weathering agent, a flame retardant, a plasticizer, and a mold release as long as the characteristics are not impaired. Agents, lubricants, crosslinking aids, pigment dispersants, antifoaming agents, leveling agents, UV absorbers, light stabilizers, thickeners, adhesion improvers, matting agents and the like may be added.
• heat stabilizers, antioxidants and deterioration inhibitors examples include hindered phenols, phosphorus compounds, hindered amines, sulfur compounds, copper compounds, alkali metal halides, and mixtures thereof.
• reinforcing agents examples include clay, talc, calcium carbonate, zinc carbonate, wollastonite, silica, alumina, magnesium oxide, calcium silicate, sodium aluminate, sodium aluminosilicate, magnesium silicate, glass balloon, carbon black, and oxidation.
• examples include zinc, zeolite, hydrotalcite, metal fiber, metal whisker, ceramic whisker, potassium titanate whisker, boron nitride, graphite, glass fiber, and carbon fiber.
• UV absorbers examples include salicylic acid-based, benzophenone-based, benzotriazole-based, and cyanoacrylate-based UV absorbers.
• Examples of the light stabilizer that can be used include hindered amine light stabilizers. Specifically, bis (1,2,2,6,6-pentamethyl-4-piperidyl) [[3,5-bis (1,1-dimethylethyl) -4-hydroxyphenyl] methyl] butyl malonate, Bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, methyl (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, bis (2,2,6) decanedioate , 6-tetramethyl-1-octyloxy] -4-piperidinyl] ester and the like, modified products, polymers and derivatives thereof.
• hindered amine light stabilizers Specifically, bis (1,2,2,6,6-pentamethyl-4-piperidyl) [[3,5-bis (1,1-dimethylethyl) -4-hydroxyphenyl] methyl] butyl malonate, Bis (1,2,2,6,
• seat obtained by forming a silicon oxide layer in a base film is used as a solar cell back surface sealing sheet.
• the solar cell back surface sealing sheet in this invention is good also as a form which laminated
• bonding using a known dry lamination method can be applied.
• an adhesive prepared by diluting two resins of a main agent and a crosslinking agent with a diluting solvent is used.
• polyether polyurethane-based, polyester polyurethane-based, polyester-based, and polyepoxy-based resins are the main ingredients, and the cross-linking agent is rich in reactivity with active hydroxyl groups, and its reaction rate and initial adhesive force are rapidly expressed. It is preferable to use an isocyanate group-containing polymer.
• the adhesive layer formed from these adhesives does not cause delamination due to deterioration of the adhesive strength after long-term outdoor use, and causes yellowing that leads to a decrease in light reflectance. It is required that there is no.
• the resin used for forming the adhesive layer is preferably an aliphatic resin or an alicyclic resin that does not contain an aromatic ring or has a low content.
• the thickness of the adhesive layer is preferably in the range of 1 to 10 ⁇ m. When the thickness of the adhesive layer is within this preferable range, sufficient adhesive strength can be obtained, but the production cost does not increase.
• the solar cell backside sealing sheet is required to have various properties such as water vapor barrier properties, light reflectivity, long-term moisture and weather resistance, adhesion to sealing materials, and electrical insulation.
• various company-specific sheet designs laminate designs are made in combination with various functional films, processing techniques such as vapor deposition and wet coating in accordance with the concept of functional division.
• a substrate film having hydrolysis resistance a white film, a film having an inorganic oxide vapor deposition layer, and an outer layer side weather resistance / ultraviolet blocking resin layer (film, resin coating layer, etc.) It is good also as a solar cell back surface sealing sheet which satisfy
• the base film of the solar cell backside sealing sheet has a weather resistant / ultraviolet blocking resin layer on the surface opposite to the surface on which the silicon oxide layer is formed.
• the base film may have a weather resistance / ultraviolet blocking resin layer, and a silicon oxide layer may be formed on the resin layer side.
• a film having hydrolysis resistance is used as a base film, and the base film is laminated with a hydrolysis resistance / weather resistance film formed with a weather resistance / ultraviolet ray blocking resin layer.
• a design having an ultraviolet blocking resin layer (hereinafter sometimes simply referred to as a resin layer) is preferable.
• the weather resistance / ultraviolet blocking resin layer include a resin layer containing an ultraviolet absorber.
• fluorine-containing resin, acrylic resin, polyester resin, polyolefin resin, polyamide resin, or the like can be used.
• the fluorine-containing resin includes polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), ethylene-tetrafluoroethylene copolymer resin (ETFE), ethylene-chlorotrifluoroethylene.
• PTFE polytetrafluoroethylene
• PVDF polyvinylidene fluoride
• PVF polyvinyl fluoride
• ETFE ethylene-tetrafluoroethylene copolymer resin
• ECTFE tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resins
• acrylic resins polymethyl methacrylate, polyacrylate, acrylic resins obtained by crosslinking acrylic polyol resins using various crosslinking agents, etc.
• Polyester resins include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT).
• Polyolefin resins include polypropylene and polyethylene.
• Ethylene - vinyl acetate (EVA) Ethylene - vinyl acetate
• cyclic olefin resins a polyamide resin, nylon 6, nylon 6,6, nylon 11, and nylon 12 can be exemplified.
• an inorganic ultraviolet absorber or an organic ultraviolet absorber is used as the ultraviolet absorber blended in these resins.
• inorganic ultraviolet absorbers include titanium oxide and zinc oxide that can also be used as white pigments, and carbon black that can also be used as black pigments.
• organic ultraviolet absorbers include salicylic acid and benzophenone. Examples thereof include UV absorbers such as benzotriazole and cyanoacrylate.
• organic ultraviolet absorber examples include salicylic acid-based pt-butylphenyl salicylate, p-octylphenyl salicylate, benzophenone-based 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2 -Hydroxy-4-methoxy-5-sulfobenzophenone, 2,2 ′, 4,4′-tetrahydroxybenzophenone, bis (2-methoxy-4-hydroxy-5-benzoylphenyl) methane, benzotriazole 2- ( 2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2,2'-methylenebis [4- (1,1,3,3-tetra Methylbutyl) -6- (2Hbenzotriazol-2-yl) phenol], cyanoacrylate Ethyl-2-cyano-3,3′-diphenylacrylate), others, and
• the solar cell module which is the application of the present invention is used outdoors for 20 years, sometimes longer than that, and as an ultraviolet absorber to be used, an inorganic ultraviolet absorber is more durable from the viewpoint of durability. preferable.
• an ultraviolet absorber to be used an inorganic ultraviolet absorber is more durable from the viewpoint of durability. preferable.
• light stabilizers used in weathering and UV blocking resin layers include hindered amine-based light stabilizers.
• an acrylic polyol resin in which a resin layer is copolymerized with an ultraviolet absorber and a light stabilizer. Further, it is more preferable to mix an acrylic polyol-based resin copolymerized with an ultraviolet absorber and a light stabilizer and an inorganic ultraviolet absorber to form a resin layer because the ultraviolet blocking performance is further improved.
• the weather resistance / ultraviolet blocking resin layer may contain additives such as antistatic agents, stabilizers, antioxidants, reinforcing agents, plasticizers, lubricants, fillers, coloring pigments, and the like as necessary.
• heat stabilizers, antioxidants, and deterioration inhibitors include hindered phenols, phosphorus compounds, hindered amines, sulfur compounds, copper compounds, alkali metal halides, or mixtures thereof.
• reinforcing agents include clay, talc, calcium carbonate, zinc carbonate, wollastonite, silica, alumina, magnesium oxide, calcium silicate, sodium aluminate, sodium aluminosilicate, magnesium silicate, glass balloon, carbon black, zinc oxide, Zeolite, hydrotalcite, metal fiber, metal whisker, ceramic whisker, potassium titanate whisker, boron nitride, graphite, glass fiber, carbon fiber and the like can be mentioned.
• Examples of the weather resistant / ultraviolet blocking resin layer include the following films and coating layers.
• Examples of the film include a polyvinyl fluoride film, a polyvinylidene fluoride film, a polyethylene terephthalate film, a polyethylene film, and an ethylene-vinyl acetate film containing titanium oxide or carbon black.
• Examples thereof include a coating layer formed using a tetrafluoroethylene copolymer resin-containing paint containing titanium oxide or carbon black, and a paint containing an acrylic polyol resin and a polyisocyanate resin.
• the solar cell backside sealing sheet contains titanium oxide or a tetrafluoroethylene copolymer resin-containing paint containing carbon black, an acrylic polyol resin and a polyisocyanate resin.
• a coating layer formed using a coating material is preferable.
• the method for laminating the above weather-resistant / ultraviolet-blocking resin layer is not particularly limited. Examples thereof include a coating method and the dry laminating method described above in which a film containing another resin or additive and an adhesive are used for bonding.
• examples of the solvent for the coating solution include toluene, xylene, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, tetrahydrofuran, dimethylformamide, dimethylacetamide, methanol, ethanol, and Water and the like can be exemplified, and the property of the coating liquid may be either an emulsion type or a dissolution type.
• the method for forming the weather resistant / ultraviolet blocking resin layer is not particularly limited, and a known coating method can be used.
• a coating method various methods can be applied.
• a roll coating method, a dip coating method, a bar coating method, a die coating method, a gravure roll coating method, or a combination of these methods can be used. It can.
• the gravure roll coating method is a preferable method for increasing the stability of the coating layer forming composition.
• olar cell module When the solar cell backside sealing sheet produced as described above is used for a solar cell module, the silicon oxide layer of the solar cell backside sealing sheet is adhered to the silicone sealing material layer of the solar cell module. Include in the module.
• the characteristic evaluation method used in the present invention is as follows. (1) Measurement of coating amount The coating amount of the weather resistant / ultraviolet blocking resin layer (resin layer) was measured by the following procedure. After forming the resin layer, it was cut into an area of 500 cm 2 and the mass of the test piece was defined as mass A. Next, the resin layer was dissolved in methyl ethyl ketone from the test piece, peeled off, and the mass of the test piece was measured again to obtain mass B. Subsequently, the coating amount per unit area was calculated based on the following formula. This coating amount measurement was performed on three test pieces, and the average value was taken as the coating amount.
• a pre-calculated diluent was blended so that the mass ratio with respect to the coating was 100/4, and the coating was further calculated to have a solid concentration of 20% by mass (resin solid concentration): n-acetate
• the coating material 3 of solid content concentration 20 mass% (resin solid content concentration) was obtained by measuring propyl and stirring for 15 minutes.
• Example 1 As a base film, a hydrolysis-resistant polyethylene terephthalate film “Lumirror” (registered trademark) X10S (125 ⁇ m) having a cyclic trimer content of 1% by mass or less manufactured by Toray Industries, Inc. was prepared. One side of the base film is subjected to corona treatment, and further, the coating 1 is applied using a wire bar, and dried at 125 ° C. for 60 seconds.
• Limirror registered trademark
• a solar cell back surface sealing sheet 1 (abbreviated as sealing sheet 1 in Tables 3 and 4) was produced.
• a silicone resin tensile elastic modulus 0.09 MPa (based on JIS K 7161 (1994)), tensile strength 0.4 MPa (based on JIS K 7161 (1994)), refraction on a 3 mm thick semi-tempered glass
• Two-part curable resin with a rate of 1.402 (based on JIS K 0062 (1992)) and specific gravity (25 ° C.) 0.97 (based on JIS Z 8807 (1976)
• the inner layer side surface (the surface on which the silicon oxide layer of the base film of the base film is formed) of the stop sheet 1 is stacked and pressed using a vacuum laminator under a heating condition at 120 ° C. for 30 seconds and then pressed for 5 minutes.
• a battery module was produced.
• Example 2 The solar cell backside sealing sheet 2 (Table 3) was applied in the same manner as in Example 1 except that the silicon oxide layer forming paint 2 was applied instead of the silicon oxide layer forming paint 1 and the drying temperature was set to 80 ° C. , 4 is abbreviated as sealing sheet 2).
• a pseudo solar cell module was produced in the same manner as in Example 1 except that the solar cell back surface sealing sheet 2 was used.
• Example 3 Corona treatment is applied to the surface opposite to the surface on which the silicon oxide layer of the solar cell backside sealing sheet 1 produced by the method described in Example 1 is formed, and the paint 3 is applied using a wire bar, Dry at 150 ° C.
• a pseudo solar cell module was produced in the same manner as in Example 1 except that the solar cell back surface sealing sheet 3 was used.
• Example 4 A silicon oxide layer was formed in the same manner as in Example 1 using “Lumirror” (registered trademark) E20 (125 ⁇ m), which is a white polyethylene terephthalate film manufactured by Toray Industries, Inc., as a base film.
• a hydrolysis-resistant polyethylene terephthalate film “Lumirror” (registered trademark) X10S (125 ⁇ m) having a cyclic trimer content of 1% by mass or less was prepared as a laminate film.
• One side of this laminating film is subjected to corona treatment and further coated with a paint 3 using a wire bar and dried at 150 ° C. for 30 seconds so that the coating amount after drying is 3.0 g / m 2.
• a weather resistant / ultraviolet blocking resin layer was provided.
• a dry laminating adhesive is applied using a wire bar, and dried at 80 ° C.
• a dry laminate adhesive layer was formed so that the coating amount after drying was 5.0 g / m 2 (thickness 5 ⁇ m).
• the surface opposite to the surface on which the weather resistance / ultraviolet blocking resin layer of the laminating film is formed is bonded, dry lamination is performed, and the solar cell back surface sealing sheet 4 (in Tables 3 and 4, the sealing sheet 4 and (Abbreviated).
• a pseudo solar cell module was produced in the same manner as in Example 1 except that the solar cell back surface sealing sheet 4 was used. (Example 5) Applying paint 3 instead of silicon oxide layer-forming paint 1, drying at 150 ° C.
• the solar cell back surface sealing sheet 5 (abbreviated as the sealing sheet 5 in Tables 3 and 4) was prepared in the same manner as in Example 1 except that.
• a pseudo solar cell module was produced in the same manner as in Example 1 except that the solar cell back surface sealing sheet 5 was used.
• the method for producing a solar cell module, the solar cell backside sealing sheet, and the solar cell module of the present invention are useful because they are excellent in adhesive strength and weather resistance with respect to a silicone encapsulant.

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• 2012
  • 2012-08-28 IN IN2271CHN2014 patent/IN2014CN02271A/en unknown
  • 2012-08-28 KR KR1020147003863A patent/KR20140059197A/ko not_active Withdrawn
  • 2012-08-28 CN CN201280041452.3A patent/CN103765611A/zh active Pending
  • 2012-08-28 US US14/238,608 patent/US20140190557A1/en not_active Abandoned
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