WO2013021860A1 - 積層シートおよびその製造方法 - Google Patents
積層シートおよびその製造方法 Download PDFInfo
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- WO2013021860A1 WO2013021860A1 PCT/JP2012/069440 JP2012069440W WO2013021860A1 WO 2013021860 A1 WO2013021860 A1 WO 2013021860A1 JP 2012069440 W JP2012069440 W JP 2012069440W WO 2013021860 A1 WO2013021860 A1 WO 2013021860A1
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- HRRDCWDFRIJIQZ-UHFFFAOYSA-N naphthalene-1,8-dicarboxylic acid Chemical compound C1=CC(C(O)=O)=C2C(C(=O)O)=CC=CC2=C1 HRRDCWDFRIJIQZ-UHFFFAOYSA-N 0.000 description 1
- RXOHFPCZGPKIRD-UHFFFAOYSA-N naphthalene-2,6-dicarboxylic acid Chemical compound C1=C(C(O)=O)C=CC2=CC(C(=O)O)=CC=C21 RXOHFPCZGPKIRD-UHFFFAOYSA-N 0.000 description 1
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- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
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- IBBQVGDGTMTZRA-UHFFFAOYSA-N sodium;2-sulfobenzene-1,3-dicarboxylic acid Chemical compound [Na].OC(=O)C1=CC=CC(C(O)=O)=C1S(O)(=O)=O IBBQVGDGTMTZRA-UHFFFAOYSA-N 0.000 description 1
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- GJBRNHKUVLOCEB-UHFFFAOYSA-N tert-butyl benzenecarboperoxoate Chemical compound CC(C)(C)OOC(=O)C1=CC=CC=C1 GJBRNHKUVLOCEB-UHFFFAOYSA-N 0.000 description 1
- 238000009823 thermal lamination Methods 0.000 description 1
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- 238000002834 transmittance Methods 0.000 description 1
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- WVLBCYQITXONBZ-UHFFFAOYSA-N trimethyl phosphate Chemical compound COP(=O)(OC)OC WVLBCYQITXONBZ-UHFFFAOYSA-N 0.000 description 1
- PXXNTAGJWPJAGM-UHFFFAOYSA-N vertaline Natural products C1C2C=3C=C(OC)C(OC)=CC=3OC(C=C3)=CC=C3CCC(=O)OC1CC1N2CCCC1 PXXNTAGJWPJAGM-UHFFFAOYSA-N 0.000 description 1
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Images
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- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
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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
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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
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- Y10T428/00—Stock material or miscellaneous articles
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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
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Definitions
- the present invention relates to a laminated sheet having good long-term durability, curling properties, interlayer adhesion, partial discharge voltage, and workability.
- the present invention relates to a laminated sheet that can be suitably used as a solar cell backsheet, and a method for producing the laminated sheet.
- a solar cell is composed of a power generating element sealed with a transparent sealing agent such as ethylene-vinyl acetate copolymer (EVA), and a transparent substrate such as glass and a resin sheet called a back sheet bonded together.
- EVA ethylene-vinyl acetate copolymer
- the Sunlight is introduced into the solar cell through the transparent substrate 4.
- Sunlight introduced into the solar cell is absorbed by the power generation element, and the absorbed light energy is converted into electrical energy.
- the converted electric energy is taken out by a lead wire connected to the power generation element and used for various electric devices.
- the structure which provides barrier property and an electrical property by pasting together various materials to the conventional back sheet 1 by dry lamination to biaxially stretched polyethylene terephthalate (PET) which is inexpensive and has high performance has been studied.
- PET polyethylene terephthalate
- the olefin resin is a material generally used as a back sheet because of its good adhesion to a sealant in addition to barrier properties.
- a sheet obtained by laminating an olefin resin on both surface layers of a thin PET film has a drawback of low flame retardancy, and has a problem that it is easily bent during secondary processing due to weak self-supporting property.
- stacked PET film on both surface layers of the olefin resin had the fault that adhesiveness with a sealing agent was low and long-term durability was also low.
- the present inventors developed a sheet in which an olefin resin is laminated on one surface layer of a PET film by melt extrusion lamination.
- a highly durable PET film is selected and used for the PET layer.
- the highly durable PET film is a COOH end group in the film. Since the amount was very small, there was a problem that the adhesiveness with other materials was poor as compared with a general-purpose PET film.
- the present invention provides a back sheet for a solar cell that has good long-term durability, curling properties, interlayer adhesion, voltage resistance, and workability.
- the present invention has the following configuration. That is, a laminated sheet having a layer (P1 layer) mainly comprising a polyester-based resin, an adhesive resin layer (P2 layer), and a layer (P3 layer) mainly comprising a polyolefin-based resin,
- the total thickness of the laminated sheet is 30 ⁇ m to 500 ⁇ m
- the thickness of the P2 layer is 0.1 ⁇ m to 3 ⁇ m
- the thickness of the P1 layer is P1
- the thickness of the P3 layer is P3
- the ratio P1 / P3 is 0.2 to 5
- a laminated sheet having better long-term durability, curling properties, interlayer adhesion, partial discharge voltage, and processing suitability than conventional laminated sheets of polyester resin and olefin resin.
- Such a laminated sheet can be suitably used for a solar cell backsheet, and a high-performance solar cell can be provided by using the backsheet.
- the laminated sheet of the present invention has a layer (P1 layer) containing a polyester resin as a main constituent, an adhesive resin layer (P2 layer), and a layer (P3 layer) containing a polyolefin resin as a main constituent.
- the total thickness of the laminated sheet of the present invention is preferably 30 ⁇ m or more and 500 ⁇ m or less.
- the total thickness is less than 30 ⁇ m, the partial discharge voltage is small, and there is a problem that dielectric breakdown occurs when used under a high voltage.
- the total thickness is greater than 500 ⁇ m, the processability is poor, and when used as a solar battery back sheet, there is a problem that the overall thickness of the solar battery cell becomes too thick.
- a more preferable lower limit is 40 ⁇ m or more, and further preferably 50 ⁇ m or more.
- a more preferable upper limit is 450 ⁇ m or less, and further preferably 400 ⁇ m or less.
- a preferable range is 40 ⁇ m or more and 450 ⁇ m or less, and more preferably 50 ⁇ m or more and 400 ⁇ m or less.
- the thickness P1 is P1 and the thickness P3 is P3, and the ratio P1 / P3 is 0.2 or more and 5 or less.
- the thickness ratio P1 / P3 is less than 0.2, the curling property is lowered when a laminated sheet is formed.
- the thickness ratio P1 / P3 is greater than 5, the proportion of the olefin layer is reduced and the gas barrier property is lowered.
- a more preferable lower limit is 0.5 or more, and further preferably 0.7 or more.
- a more preferable upper limit is 4 or less, and further preferably 3 or less.
- a preferred range is 0.5 or more and 4 or less, more preferably 0.7 or more and 3 or less.
- the thickness of the P1 layer in the laminated sheet of the present invention is preferably 15 ⁇ m or more and 300 ⁇ m or less. If the total thickness or the thickness ratio P1 / P3 is controlled within the range of the present application if it is less than 15 ⁇ m, there is a problem that the curl becomes large or the gas barrier property deteriorates because the P3 layer thickness becomes thin. If it is thicker than 300 ⁇ m, the total thickness of the laminated sheet will increase, and there will be a problem that the suitability for processing will be reduced. To reduce the total thickness, it is necessary to reduce the thickness of the olefin layer. Is a problem. A more preferable lower limit is 25 ⁇ m or more, and further preferably 30 ⁇ m or more. A more preferable upper limit is 250 ⁇ m or less, and further preferably 200 ⁇ m or less. A preferable range is 25 ⁇ m or more and 250 ⁇ m or less, and more preferably 30 ⁇ m or more and 200 ⁇ m or less.
- the thickness of the P3 layer in the laminated sheet of the present invention may be in the range where the thickness ratio P1 / P3 is 0.2 or more and 5 or less, but is preferably 75 ⁇ m or more and 400 ⁇ m or less, more preferably 100 ⁇ m or more and 300 ⁇ m or less.
- the thickness ratio P1 / P3 is 0.2 or more and 5 or less, but is preferably 75 ⁇ m or more and 400 ⁇ m or less, more preferably 100 ⁇ m or more and 300 ⁇ m or less.
- the thickness of the P3 layer is less than 75 ⁇ m, the gas barrier property may be lowered.
- it is larger than 400 ⁇ m the curl becomes large and the workability may be lowered.
- the thickness of the P2 layer in the laminated sheet of the present invention needs to be 0.1 ⁇ m or more and 3 ⁇ m or less. If it is less than 0.1 ⁇ m, the adhesion between the P1 layer / P2 layer / P3 layer may be lowered after the laminated sheet is formed, and delamination may occur. On the other hand, if it is thicker than 3 ⁇ m, it takes a long time to develop adhesive force (accelerating the crosslinking reaction between the main agent and the curing agent), and as a result, the heat and moisture resistance of the adhesive layer may be lowered.
- a more preferable lower limit is 0.15 ⁇ m or more, and further preferably 0.2 ⁇ m or more.
- a more preferable upper limit is 2 ⁇ m or less, and further preferably 1 ⁇ m or less.
- a preferred range is from 0.15 ⁇ m to 2 ⁇ m, and more preferably from 0.2 ⁇ m to 1 ⁇ m.
- it is preferable to provide the P2 layer by in-line coating during the formation of the P1 layer because the manufacturing process is simplified, the film-forming property of the film is good, and the thickness unevenness and coating defects are reduced.
- the P1 layer in the present invention is mainly composed of a polyester resin.
- the P1 layer may have a laminated structure in the following description. In that case, the entire laminated structure as the P1 layer is mainly composed of a polyester-based resin.
- the main component means that the polyester resin is contained in excess of 50% by mass with respect to the P1 layer.
- the polyester resin used for the P1 layer include polyethylene terephthalate, polyethylene-2,6-naphthalate, polypropylene terephthalate, polybutylene terephthalate, and polylactic acid.
- the polyester resin used in the present invention includes 1) polycondensation of a dicarboxylic acid component or an ester-forming derivative thereof (hereinafter collectively referred to as “dicarboxylic acid component”) and a diol component, and 2) a carboxylic acid in one molecule. Alternatively, it can be obtained by a polycondensation of a compound having a carboxylic acid derivative portion and a hydroxyl group and 1) 2).
- the polymerization of the polyester resin can be performed by a conventional method.
- dicarboxylic acid component malonic acid, succinic acid, glutaric acid, adipic acid, suberic acid, sebacic acid, dodecanedioic acid, dimer acid, eicosandioic acid, pimelic acid, azelaic acid, methylmalonic acid, Aliphatic dicarboxylic acids such as ethylmalonic acid, adamantane dicarboxylic acid, norbornene dicarboxylic acid, isosorbide, cyclohexanedicarboxylic acid, decalin dicarboxylic acid and other alicyclic dicarboxylic acids, terephthalic acid, isophthalic acid, phthalic acid, 1,4-naphthalenedicarboxylic Acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 1,8-naphthalenedicarboxylic acid, 4,4′-diphenyldicarboxy
- dicarboxy compounds obtained by condensing oxyacids such as l-lactide, d-lactide, hydroxybenzoic acid and the like, or a combination of a plurality of such oxyacids at the carboxy terminus of the dicarboxylic acid component described above are also used. be able to.
- diol component examples include aliphatic diols such as ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,2-butanediol, and 1,3-butanediol, cyclohexane Fragrances such as alicyclic diols such as dimethanol, spiroglycol and isosorbide, bisphenol A, 1,3-benzenedimethanol, 1,4-benzenedimethanol, 9,9'-bis (4-hydroxyphenyl) fluorene Group diols are listed as typical examples. Moreover, these may be used independently or may be used in multiple types as needed. In addition, dihydroxy compounds formed by condensing diols on the hydroxy terminal of the diol component described above can also be used.
- aliphatic diols such as ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butane
- examples of the compound having a carboxylic acid or a carboxylic acid derivative skeleton and a hydroxyl group in one molecule include oxyacids such as l-lactide, d-lactide, and hydroxybenzoic acid, and derivatives thereof, oligomers of oxyacids, Examples thereof include those obtained by condensing an oxyacid with one carboxyl group of dicarboxylic acid.
- the number average molecular weight of the polyester resin constituting the P1 layer is preferably 18500 to 40000, more preferably 19000 to 35000, and still more preferably 20000 to 33000.
- the number average molecular weight of the polyester resin constituting the P1 layer is less than 18500, long-term durability may be lowered, which is not preferable.
- the P1 layer is preferably stretched uniaxially or biaxially. The long-term durability can be improved by orientation crystallization by stretching.
- the minute endothermic peak temperature TmetaP1 of the P1 layer obtained by differential scanning calorimetry is the melting point TmP1-90 ° C. to TmP1-40 ° C. of the P1 layer. More preferably, TmetaP1 is TmP1-80 to TmP1-50 ° C, and further preferably TmetaP1 is TmP1-75 to TmP1-55 ° C. If TmetaP1 is less than TmP1-90 ° C., the residual stress at the time of stretching is insufficient, and as a result, the thermal shrinkage of the film becomes large, and bonding is not possible in the bonding process when incorporated in a solar cell.
- the solar cell system may be greatly warped when incorporated into a solar cell and used at high temperatures.
- TmetaP1 exceeds TmP1-40 ° C., the orientation crystallinity may be lowered and the heat-and-moisture resistance may be inferior.
- TmetaP1 of the P1 layer within the above range, both reduction of shrinkage rate and wet heat resistance can be achieved.
- the melting point TmP1 of the P1 layer is preferably 220 ° C. or higher in view of heat resistance, more preferably 240 ° C. or higher, and further preferably 250 ° C.
- the upper limit of the melting point TmP1 of the P1 layer is not particularly limited but is preferably 300 ° C. or less from the viewpoint of productivity.
- the entire laminated structure as the P1 layer preferably contains titanium oxide particles in the range of 1% by mass to 30% by mass with respect to the P1 layer. This makes it possible to exhibit the effect of reducing coloring due to deterioration of the sheet over a long period of time by utilizing the ultraviolet resistance and light reflectivity of the titanium oxide particles. If it is less than 1% by mass, the UV resistance may be lowered. If it is more than 30% by mass, the adhesion between the layers may be lowered.
- a more preferable lower limit is 2% by mass or more, and further preferably 3% by mass or more.
- a more preferable upper limit is 25% by mass or less, and further preferably 20% by mass or less.
- the method of adding titanium oxide particles to the polyester resin constituting the P1 layer is a method in which a polyester resin and titanium oxide particles are melt kneaded in advance using a vented biaxial kneading extruder or tandem extruder. preferable.
- the polyester-based resin is deteriorated.
- a high-concentration master pellet having a larger amount of particles added than the amount of titanium oxide particles contained in the P1 layer is prepared and mixed with a polyester resin for dilution to obtain a predetermined titanium oxide particle content in the P1 layer. Is preferable from the viewpoint of heat and moisture resistance.
- the P1 layer in the laminated sheet of the present invention has a heat resistance stabilizer, an oxidation resistance stabilizer, an ultraviolet absorber, and an ultraviolet light stability as long as the effects of the present invention are not impaired as necessary.
- Agents, organic / inorganic lubricants, organic / inorganic fine particles, fillers, nucleating agents, dyes, dispersants, coupling agents, and the like, and bubbles may be blended.
- an ultraviolet absorber is selected as the additive, the ultraviolet resistance of the laminated sheet of the present invention can be further improved.
- additive antistatic agent to improve withstand voltage, add organic / inorganic fine particles and bubbles to develop reflectivity, and add color material you want to color to add design You can also In addition, in applications that are used outdoors, it is possible to suppress changes in color tone over a long period of time by using organic particles having ultraviolet absorbing ability, for example, carbon-based materials such as carbon, fullerene, carbon fiber, and carbon nanotube. It is possible to obtain a sheet having design properties while remarkably exhibiting the effects of the invention.
- the P1 layer in the present invention may have a laminated structure.
- a laminated structure of a P11 layer excellent in moisture and heat resistance and a layer P12 layer containing a high concentration of an ultraviolet absorber or titanium oxide particles having ultraviolet absorbing ability is also preferable.
- the configuration of the laminated sheet of the present invention is P12 layer / P11 layer / P2 layer / P3 layer.
- the resin used for the P11 layer and the P12 layer those exemplified for the P1 layer can be suitably used as appropriate.
- a layer having other functions such as gas barrier property and ultraviolet resistance can be provided on one surface of the P1 layer (however, the surface opposite to the surface in contact with the P2 layer).
- a method of providing these layers a method of separately preparing materials to be laminated with the P1 layer and thermocompression bonding with a heated group of rolls (thermal laminating method), a method of bonding together with an adhesive (adhesion method) )
- thermal laminating method thermocompression bonding with a heated group of rolls
- a method of bonding together with an adhesive (adhesion method)
- a method of dissolving the material for forming the material to be laminated in a solvent and applying the solution onto the P1 layer prepared in advance coating method
- electromagnetic wave irradiation after applying a curable material onto the P1 layer A method of curing by heat treatment or the like, a method of depositing / sputtering a material to be laminated on the P1 layer, a method combining these, and the like
- the P1 layer in the present invention is a layer mainly composed of polyethylene terephthalate (PET) resin, and the intrinsic viscosity IV of the P1 layer is 0.65 or more and 0.80 or less, and the COOH end group amount is 25 eq. / T or less is preferable.
- the lower limit of the COOH end group amount is 1 eq. / T.
- the main component means that the PET resin is contained in excess of 50% by mass with respect to the P1 layer.
- the PET layer constituting the P1 layer can be a laminated sheet having excellent moldability and long-term durability by satisfying the above range.
- the P3 layer in the present invention is mainly composed of a polyolefin resin.
- the main component means that the polyolefin resin is contained in an amount exceeding 50% by mass with respect to the P3 layer.
- the polyolefin resin in the present invention include polyethylene, polypropylene, polybutene, polymethylpentene, polycycloolefin, polyhexene, polyoctene, polydecene, and polydodecene.
- polyethylene (PE) and polypropylene (PP) are preferable because they are easy to process and relatively inexpensive.
- polyethylene relatively low density low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and among polypropylene, homopolymers and random copolymers can be preferably used.
- LDPE relatively low density low density polyethylene
- LLDPE linear low density polyethylene
- polypropylene homopolymers and random copolymers
- EPC ethylene-propylene copolymer
- EPBC ethylene-propylene-butene copolymer
- polyolefin elastomers may be included as a mixture, where the polyolefin elastomers are those in which ethylene-propylene rubber is finely dispersed in polypropylene, or in which other ⁇ -olefins are copolymerized in polypropylene.
- the ⁇ -olefin include 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-dodecene, 4-methyl-1-pentene and the like.
- polyolefin-based elastomers are preferably contained in a proportion of 5% by mass or more and 50% by mass or less with respect to the P3 layer.
- the P3 layer can be made flexible and curling of the laminated sheet is improved, which is preferable.
- it is 10 mass% or more and 30 mass% or less.
- a P3 layer on the side that adheres to the sealant contains a polyolefin-based elastomer, it is preferable from the viewpoint of wet heat resistance in the adhesive strength with the sealant.
- the polyolefin resin and polyolefin elastomer forming the P3 layer in the present invention may be commercially available products, such as “Thermolan” and “Zeras” manufactured by Mitsubishi Chemical Corporation, “Excellen” manufactured by Sumitomo Chemical Co., Ltd., “ “Tufselen”, “Esprene”, “Noblen”, “Sumikasen L”, “Hibler” manufactured by Kuraray, “Septon”, “Prime Polypro” manufactured by Prime Polymer Co., Ltd. “Notio” manufactured by Mitsui Chemicals, Inc., Dow Chemical Co., Ltd. ) “ENGAGE” manufactured by the company is preferred.
- the polyolefin-type resin which comprises P3 layer in this invention contains a propylene component 70 mass% or more.
- a polyolefin-based elastomer it is preferable to select the propylene component to be 70% by mass or more. More preferably, it is 80 mass% or more, More preferably, it is 90 mass% or more.
- the entire laminated structure as the P3 layer preferably contains titanium oxide particles in the range of 0.5 mass% to 20 mass% with respect to the P3 layer. Utilizing the reflection characteristics of the titanium oxide particles, it is possible to reflect the transmitted light that has not been converted by the solar battery cell, and to exert an effect on increasing the efficiency of the solar battery. If it is less than 0.5% by mass, the reflection characteristics may be lowered. If it is more than 20% by mass, the adhesion to the EVA layer may be lowered.
- a more preferable lower limit is 1% by mass or more, and further preferably 2.5% by mass or more.
- a more preferable upper limit is 15% by mass or less, and further preferably 10% by mass or less.
- the method of adding titanium oxide particles to the polyolefin resin constituting the P3 layer is a method of melt-kneading the polyolefin resin and titanium oxide particles in advance using a vented biaxial kneading extruder or tandem extruder. preferable.
- the thermal history is received when the titanium oxide particles are contained, the polyolefin-based resin is deteriorated.
- a high-concentration master pellet having a larger amount of added particles than the amount of titanium oxide particles contained in the P3 layer is prepared, mixed with a polyolefin resin, and diluted to obtain a predetermined content of titanium oxide particles in the P3 layer. Is preferable from the viewpoint of heat and moisture resistance.
- the P3 layer in the present invention preferably contains a modified polyolefin resin in order to increase the adhesive force with the adhesive resin layer (P2 layer).
- the modified polyolefin resin is an acid-modified polyolefin modified with an unsaturated carboxylic acid or an anhydride thereof, or a polyolefin modified with a silane coupling agent as a main component (here, the main component refers to the entire resin). It is said that the content is 50% by mass or more).
- Examples of the unsaturated carboxylic acid or its anhydride include acrylic acid, methacrylic acid, maleic acid, maleic anhydride, citraconic acid, citraconic anhydride, itaconic acid, itaconic anhydride, or monoepoxy compounds of these derivatives and the above acids. Ester compounds, and a reaction product of a polymer having a group capable of reacting with these acids in the molecule and an acid. These metal salts can also be used. Among these, maleic anhydride is more preferably used.
- Examples of the silane coupling agent include vinyltriethoxysilane, methacryloyloxytrimethoxysilane, and ⁇ -methacryloyloxypropyltriacetyloxysilane. Moreover, these compounds can be used alone or in combination, and among them, those obtained by graft modification with the above compounds can be suitably used.
- the content of the modified polyolefin resin of the P3 layer is preferably 1% by mass or more and 30% by mass or less with respect to the P3 layer. If it is less than 1% by mass, there is a problem that the adhesion between the layers is lowered, and if it is more than 30% by mass, the long-term durability may be lowered. More preferably, it is 5 mass% or more and 15 mass% or less.
- the P3 layer in the present invention preferably has a laminated structure.
- the P3 layer preferably has a configuration of a P31 layer, a P32 layer, and a P33 layer.
- the laminated sheet of the present invention is preferably laminated in the order of P1 layer / P2 layer / P31 layer / P32 layer / P33 layer, but P1 layer / P2 layer / P31 layer / P32 layer / P31. Layer, P1 layer / P2 layer / P31 layer / P32 layer.
- the P31 layer is a layer having better interlayer adhesion with the P2 layer
- the P32 layer is a layer having better moisture and heat resistance
- it is excellent in long-term durability and is preferably used. be able to.
- the method for selecting the polyolefin resin constituting the P31 layer, P32 layer, and P33 layer is not particularly limited, but from the viewpoint of long-term durability of the laminated sheet, the polyolefin resin used for the P31 layer is a modified polyolefin of P2 layer. Those having compatibility with the resin and good adhesion to the P2 layer are appropriately selected and preferably used. Further, when the laminated sheet of the present invention is used as a solar battery back sheet, the P32 layer and the P33 layer are excellent in gas barrier properties and have good adhesion to the sealing material from the viewpoint of long-term durability of the solar battery cells. Selected and preferably used.
- the resin constituting the P31 layer may be selected from those having compatibility with the modified polypropylene resin of the P2 layer and good adhesion.
- the resin used for the P31 layer, the P32 layer, and the P33 layer those exemplified for the P3 layer can be suitably used as appropriate.
- the stacking ratio of the P31 layer, the P32 layer, and the P33 layer is not particularly limited, and may be a thickness configuration that can fully express the function of each layer.
- the laminated sheet of the present invention requires an adhesive resin layer P2 layer for bonding the P1 layer and the P3 layer.
- a technique for laminating and processing into a sheet is not particularly limited, and a known method can be used. In particular, in the present invention, a dry laminating method or a melt extrusion laminating method is preferably used.
- the P2 layer has a crosslinking agent such as a polyether polyurethane resin, a polyester polyurethane resin, a polyester resin, a polyepoxy resin, an acrylic resin as a main component. Polyisocyanate resins, epoxy resins, melamine resins, oxazoline resins and the like can be used.
- the P2 layer When the P2 layer is formed using these adhesives, the P2 layer may be used alone or in combination of two or more.
- the adhesive strength deteriorates due to long-term outdoor use. It is desirable that no lamination or the like occurs and that yellowing that leads to a decrease in light reflectance does not occur.
- a polyurethane-based resin such as polyether urethane or polyester urethane as the main agent and an epoxy-based resin as the cross-linking agent are preferably used in order to improve interlayer adhesion and interlayer adhesion after a moist heat resistance test. .
- the polyurethane resin is a resin containing a urethane bond in the main chain, and is obtained, for example, by a reaction between a polyol compound and a polyisocyanate compound, and has an anionic group from the viewpoint of dispersibility in an aqueous medium.
- the anionic group means a functional group that becomes an anion in an aqueous medium such as a carboxyl group, a sulfonic acid group, a sulfuric acid group, and a phosphoric acid group.
- the polyol component constituting the polyurethane-based resin is not particularly limited, and water, ethylene glycol, diethylene glycol, triethylene glycol, 1,3-butanediol, 1,4-butanediol, 1,2-propanediol, 1, 3-propanediol, 1,6-hexanediol, neopentyl glycol, 1,4-cyclohexanedimethanol, methyl-1,5-pentanediol, 1,8-octanediol, 2-ethyl-1,3-hexanediol , Low molecular weight glycols such as diethylene glycol, triethylene glycol and dipropylene glycol, low molecular weight polyols such as trimethylolpropane, glycerin and pentaerythritol, polyol compounds having ethylene oxide and propylene oxide units Polyether diols, high molecular weight diols
- the polyisocyanate component one or a mixture of two or more known aromatic, aliphatic and alicyclic diisocyanates can be used.
- diisocyanates include tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, 1,3-phenylene diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, 1,5-naphthylene diisocyanate, isophorone diisocyanate, dimaryl diisocyanate, Examples thereof include lysine diisocyanate, hydrogenated 4,4′-diphenylmethane diisocyanate, hydrogenated tolylene diisocyanate, dimerized isocyanate obtained by converting the carboxyl group of dimer acid into an isocyanate group, and adducts, biurets, and isocyanurates.
- diisocyanates trifunctional or higher functional polyisocyanates such as triphenylmethane triisocyanate and polymethylene polyphenyl isocyanate may be used.
- a polyol component having a carboxyl group, a sulfonic acid group, a sulfuric acid group, a phosphoric acid group, or the like may be used.
- the polyol compound having a carboxyl group include 3,5-dihydroxybenzoic acid, 2,2-bis (hydroxymethyl) propionic acid, 2,2-bis (hydroxyethyl) propionic acid, and 2,2-bis (hydroxypropyl).
- Propionic acid bis (hydroxymethyl) acetic acid, bis (4-hydroxyphenyl) acetic acid, 2,2-bis (4-hydroxyphenyl) pentanoic acid, tartaric acid, N, N-dihydroxyethylglycine, N, N-bis (2 -Hydroxyethyl) -3-carboxyl-propionamide and the like.
- the molecular weight of the polyurethane resin can be appropriately adjusted using a chain extender.
- the chain extender include compounds having two or more active hydrogens such as amino groups and hydroxyl groups capable of reacting with isocyanate groups.
- diamine compounds, dihydrazide compounds, and glycols can be used.
- the P2 layer preferably contains a modified polyolefin resin in order to increase the adhesion between the P1 layer and the P3 layer.
- the modified polyolefin resin is an acid-modified polyolefin modified with an unsaturated carboxylic acid or an anhydride thereof, or a polyolefin modified with a silane coupling agent as a main component (here, the main component refers to the entire resin). It is said that the content is 50% by mass or more).
- the modified polyolefin resin of the P2 layer includes alkenes such as propylene, 1-butene, isobutene, 1-pentene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-hexene, butadiene, isoprene, etc.
- modified polyolefin resins such as dienes.
- the polyolefin resin component of the P2 layer is a propylene component or a butene component (1-butene, isobutene) from the viewpoint of ease of production of the resin, ease of water treatment, adhesion to various materials, blocking property, and the like. Etc.), and both can be used in combination.
- the polyolefin resin component may contain an ethylene component. By containing an ethylene component, the water-based resin and the coating film performance are improved.
- the form of copolymerization of each component is not limited, and examples thereof include random copolymerization and block copolymerization. From the viewpoint of ease of polymerization, random copolymerization is preferred.
- Two or more types of polyolefin resins may be mixed so as to achieve the constituent component ratio of the present invention.
- the modified polyolefin resin of the P2 layer in the present invention is an unsaturated carboxylic acid or an anhydride thereof, or a polyolefin modified with a silane coupling agent.
- Examples of the unsaturated carboxylic acid or an anhydride thereof include acrylic acid, Methacrylic acid, maleic acid, maleic anhydride, citraconic acid, citraconic anhydride, itaconic acid, itaconic anhydride, or monoepoxy compounds of these derivatives and ester compounds of the above acids, can react with these acids in the molecule
- Examples include a reaction product of a polymer having a group and an acid. These metal salts can also be used.
- Examples of the silane coupling agent include vinyltriethoxysilane, methacryloyloxytrimethoxysilane, and ⁇ -methacryloyloxypropyltriacetyloxysilane.
- maleic anhydride acrylic acid, and methacrylic acid are preferable, and maleic anhydride is particularly preferable from the viewpoint of easy introduction into the polyolefin resin.
- These unsaturated carboxylic acids or anhydrides may be copolymerized in the polyolefin resin, and the form thereof is not limited, and examples thereof include random copolymerization, block copolymerization, and graft copolymerization.
- the method for introducing the unsaturated carboxylic acid into the polyolefin resin is not particularly limited. For example, in the presence of a radical generator, the reaction is performed by heating and melting the polyolefin resin and the unsaturated carboxylic acid above the melting point of the polyolefin resin.
- radical generator used for graft copolymerization examples include di-tert-butyl peroxide, dicumyl peroxide, tert-butyl hydroperoxide, tert-butyl cumyl peroxide, benzoyl peroxide, dilauryl peroxide, Examples thereof include organic peroxides such as cumene hydroperoxide, tert-butyl peroxybenzoate, ethyl ethyl ketone peroxide, and di-tert-butyl diperphthalate, and azonitriles such as azobisisobutyronitrile. These may be appropriately selected depending on the reaction temperature.
- the polyurethane-based resin is a resin containing a urethane bond in the main chain, and is obtained, for example, by a reaction between a polyol compound and a polyisocyanate compound, and has an anionic group from the viewpoint of dispersibility in an aqueous medium.
- the anionic group means a functional group that becomes an anion in an aqueous medium such as a carboxyl group, a sulfonic acid group, a sulfuric acid group, and a phosphoric acid group.
- the ratio W2a / W2b of the modified polyolefin resin content W2a and the polyurethane resin content W2b in the P2 layer is preferably 0.1 or more and 9 or less.
- the modified polyolefin resin increases the adhesion to the P3 layer, and the polyurethane resin increases the adhesion to the P1 layer. Therefore, when W2a / W2b is less than 0.1 or greater than 9, the polyester layer P1 layer and the olefin layer P3
- the interlayer adhesion of the layer may be weakened.
- These may be mixed with modified polyolefin resin particles as appropriate, or commercially available products premixed may be used.
- Examples of the solvent for the coating solution for forming the P2 layer in the present invention include toluene, xylene, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, tetrahydrofuran, dimethylformamide, dimethylacetamide, methanol, Examples include ethanol and water, and the properties of the coating liquid may be either an emulsion type or a dissolution type. In recent years, emphasis has been placed on environmental protection, resource saving, exhaust problems of organic solvents at the time of production, and the emulsion type coating liquid mainly composed of water is the preferred form.
- a solvent used in a configuration for emulsifying the resin component or an organic solvent as a dispersion aid may be included.
- the method for emulsifying the modified polyolefin resin or polyurethane resin into an aqueous emulsion is not particularly limited, and can be produced by a device widely known to those skilled in the art as a solid / liquid stirring device or an emulsifier.
- the method for forming the P2 layer on the P1 layer is not particularly limited, and a known coating method can be used.
- a coating method various methods can be applied. 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. it can.
- a method in which an adhesive layer is provided in-line using a known coating technique during the formation of a polyester film as a substrate is also a preferable method in terms of simplifying the manufacturing process.
- the curing method may be a known method.
- thermosetting a method using active rays such as ultraviolet rays, electron beams, radiation, or a combination of these methods can be applied.
- a heat curing method using a hot air oven is preferred.
- the method of increasing the drying temperature stepwise such as material preheating / constant rate drying / residual rate drying, is preferable because the solvent does not remain in the P2 layer.
- the P2 layer in the present invention may have a laminated structure for the purpose of improving the adhesion between the P1 layer and the P3 layer.
- a method of further providing a layer (referred to as P22 layer) that is familiar with the P3 layer on an anchor coat layer (referred to as P21 layer) provided in advance on one surface of the P1 layer is also preferably used.
- the structure of the laminated sheet is laminated in the order of P1 layer / P21 layer / P22 layer / P3 layer, and the thickness of the P2 layer is represented by P21 layer + P22 layer.
- the P21 layer has good adhesiveness with the resin constituting the P1 layer and the P22 layer
- the P22 layer has good adhesiveness with the resin constituting the P21 layer and the P3 layer, so that the resin constituting the P3 layer is softened.
- the resin used for the P21 layer and the P22 layer those exemplified for the P2 layer can be suitably used as appropriate.
- the method for forming the P22 layer on the P21 layer is not particularly limited, and a known coating method can be used.
- the coating method various methods can be applied. 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. it can.
- the laminated sheet of the present invention preferably has a color tone change ⁇ b of 10 or less when the P1 layer is used as an incident surface from the viewpoint of ultraviolet resistance.
- the color tone change ⁇ b is a value calculated with K as the b value measured using the laminated sheet P1 layer before the ultraviolet ray treatment as the incident surface and K as the b value measured using the laminated sheet P1 layer after the ultraviolet ray treatment as the incident surface. is there.
- the color tone change ⁇ b is 6 or less, More preferably, it is 3 or less.
- the laminated sheet of the present invention preferably has a water vapor permeability of 0.0001 g / m 2 ⁇ day to 10 g / m 2 ⁇ day from the viewpoint of gas barrier properties. More preferably, it is 0.0001 g / m 2 ⁇ day or more and 5 g / m 2 ⁇ day or less, and most preferably 0.0001 g / m 2 ⁇ day or more and 3 g / m 2 ⁇ day or less.
- the water vapor transmission rate is a value measured according to the JIS-K7129B method (1992).
- the water vapor transmission rate in the present invention can be adjusted by the thickness of the P3 layer, and the water vapor transmission rate decreases as the thickness increases.
- the manufacturing method of the resin composition constituting the P1 layer can be manufactured by the following method.
- the resin of the P1 layer in the present invention can be obtained by subjecting a dicarboxylic acid or its ester derivative and a diol to a transesterification reaction by a known method.
- reaction catalysts include alkali metal compounds, alkaline earth metal compounds, zinc compounds, lead compounds, manganese compounds, cobalt compounds, aluminum compounds, antimony compounds, titanium compounds, and phosphorus compounds.
- an antimony compound, a germanium compound, or a titanium compound is preferably added as a polymerization catalyst at an arbitrary stage before the PET production method is completed.
- a germanium compound is taken as an example, it is preferable to add the germanium compound powder as it is.
- a so-called solid phase polymerization method in which heating is performed at a temperature lower than the melting point under reduced pressure or a flow of an inert gas such as nitrogen gas is preferable. This method is preferably performed in that the number average molecular weight can be increased without increasing the terminal carboxyl group amount of the thermoplastic resin.
- the P1 layer resin composition is heated and melted in an extruder, and is extruded onto a cast drum cooled from a die and processed into a sheet ( Melt cast method) can be used.
- the P1 layer resin is dissolved in a solvent, and the solution is extruded from a die onto a support such as a cast drum or an endless belt to form a film, and then the solvent is dried and removed from the film layer.
- a method of processing into a shape (solution casting method) or the like can also be used.
- the material of each layer to be laminated is mainly composed of a thermoplastic resin
- two different thermoplastic resins are put into two extruders and melted.
- a method of co-extrusion on a cast drum cooled from a die and processing it into a sheet (co-extrusion method)
- a method of laminating a sheet made of a single film into a extruder, melting and extruding and extruding from the die can be used.
- a uniaxial or biaxially stretched film substrate is selected as a laminate including the P1 layer and / or the P1 layer, as a manufacturing method thereof, first, an extruder (in the case of a laminated structure, a plurality of extruders) ), Melted and extruded from the die (in the case of a laminated structure, co-extruded), cooled and solidified by static electricity on a cooled drum cooled to a surface temperature of 10 to 60 ° C, unstretched Make a film.
- an extruder in the case of a laminated structure, a plurality of extruders
- Melted and extruded from the die in the case of a laminated structure, co-extruded
- cooled and solidified by static electricity on a cooled drum cooled to a surface temperature of 10 to 60 ° C unstretched Make a film.
- This unstretched film is led to a roll group heated to a temperature of 70 to 140 ° C., stretched 3 to 4 times in the longitudinal direction (longitudinal direction, that is, the traveling direction of the film), and a roll group having a temperature of 20 to 50 ° C. Cooling.
- the film is guided to a tenter while holding both ends of the film with clips, and stretched 3 to 4 times in a direction perpendicular to the longitudinal direction (width direction) in an atmosphere heated to a temperature of 80 to 150 ° C.
- the stretching ratio is 3 to 5 times in each of the longitudinal direction and the width direction, but the area ratio (longitudinal stretching ratio ⁇ lateral stretching ratio) is preferably 9 to 15 times.
- the area ratio is less than 9 times, the long-term durability of the obtained biaxially stretched laminated film becomes insufficient, and conversely, when the area magnification exceeds 15 times, the film tends to be broken during stretching.
- the simultaneous biaxial stretching method in addition to the sequential biaxial stretching method in which the stretching in the longitudinal direction and the width direction is separated as described above, the simultaneous biaxial stretching method in which the stretching in the longitudinal direction and the width direction is performed simultaneously. Either one does not matter.
- a coating process may be provided, and a coating material to be a material for the P2 layer may be applied.
- a corona treatment on the surface of the base material layer P1 immediately before the coating step.
- a heat treatment for 1 to 30 seconds is preferably subsequently performed in the tenter, preferably at a temperature not lower than the Tg of the resin and lower than the melting point. After cooling uniformly, cool to room temperature.
- the heat treatment temperature is high. However, if the heat treatment temperature is too high, the orientation crystallinity is lowered, and as a result, the formed film may be inferior in heat and moisture resistance.
- the heat treatment temperature of the P1 layer in the present invention is preferably TmP1-90 to TmP1-40 ° C. More preferably, the heat treatment temperature is TmP1-80 to TmP1-50 ° C, and more preferably TmP1-75 to TmP1-55 ° C. Furthermore, although the P1 layer in the present invention is used as a back sheet of a solar cell, the ambient temperature may rise to about 100 ° C. when used, and therefore the heat treatment temperature is 160 ° C. to TmP 1-40 ° C. (however, TmP1-40 ° C.> 160 ° C.) is preferable.
- the temperature is 170 to TmP1-50 ° C (provided that TmP1-50 ° C> 170 ° C), and more preferably 180 to TmP1-55 ° C (provided TmP1-55 ° C> 180 ° C).
- a relaxation treatment of 3 to 12% may be performed in the width direction or the longitudinal direction as necessary.
- the substrate layer of the film for a solar battery backsheet can be formed by performing a corona discharge treatment or the like in order to further enhance the adhesion with other materials and winding up.
- a plurality of extruders are used to separate the P1 layer resin composition and the P2 layer resin composition, respectively.
- a method of co-extrusion onto a cast drum that is melted in an extruder and cooled from a die to process it into a sheet (co-extrusion method), and a P2 layer resin composition is extruded into a base layer P1 layer made of a single film
- a method of laminating and extruding from a die and extruding from a die (melt laminating method), a method of separately producing P1 layer and P2 layer, and thermocompression bonding with a heated roll group (thermal laminating method), adhesion A method of bonding via an agent (adhesion method), or a method of dissolving or dispersing the P2 layer resin composition in a solvent and applying the solution onto the base material layer P1 previously prepared (Coaty) Gray
- a co-extrusion method or a coating method that facilitates the formation of the P2 layer is a more preferable method.
- the P1 layer resin composition and the P2 layer resin composition are melted in separate extruders using a plurality of extruders. Then, by co-extrusion from the die and tightly cooled and solidified by static electricity on a drum cooled to a surface temperature of 10 to 60 ° C., a sheet in which the P2 layer is formed on the P1 layer can be obtained.
- the in-line coating method applied during the formation of the base material layer P1 layer described above the base material layer P1 layer after the film formation
- An off-line coating method can be used, and either can be used, but more preferably, it can be performed simultaneously with the formation of the base material layer P1 layer, and the adhesiveness between the P2 layer and the P1 layer is high.
- the in-line coating method is preferably used.
- the P22 layer can be provided by off-line coating on the P21 layer provided on the surface of the P1 layer by in-line coating. *
- a coating liquid in which the material constituting the P2 layer is dissolved / dispersed in a solvent is applied on the base material layer P1 layer and dried.
- the means to do is used preferably.
- the solvent to be used is arbitrary, but in the in-line coating method, it is preferable to use water from the viewpoint of safety. In that case, a small amount of an organic solvent that dissolves in water may be added in order to improve applicability and solubility.
- organic solvents examples include aliphatic or alicyclic alcohols such as methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol and n-butyl alcohol, diols such as ethylene glycol, propylene glycol and diethylene glycol, methyl cellosolve, Diol derivatives such as ethyl cellosolve propylene glycol monomethyl ether, ethers such as dioxane and tetrahydrofuran, esters such as methyl acetate, ethyl acetate and amyl acetate, ketones such as acetone and methyl ethyl ketone, amides such as N-methylpyrrolidone Etc. and mixtures thereof may be used, but are not limited to these.
- aliphatic or alicyclic alcohols such as methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol and n-butyl alcohol
- the manufacturing method of the lamination sheet of this invention after shape
- a P2 layer is provided on a previously formed P1 layer, and the resin composition for the P3 layer is an extruder.
- a method in which the melt-extruded material is bonded to the P2 layer and processed into a sheet shape (melt-extrusion laminating method), and each film is prepared separately and thermocompression bonded with a heated roll group ( Thermal lamination method), bonding method using an adhesive (adhesion method), other methods of applying and drying a solution dissolved in a solvent (coating method), a method combining these, and the like can be used. .
- the melt extrusion laminating method is preferable in that the production process is short and the adhesion between the layers is good.
- the manufacturing method of the lamination sheet of this invention it is preferable to have the process by which a P3 layer is provided with the melt extrusion laminating method in the sheet
- the P3 layer resin composition is supplied to an extruder under a nitrogen stream and melted.
- the P3 layer is then extruded from the die.
- a multi-manifold die, feed block, static mixer, pinol, etc. are used for the P31 layer, P32 layer, and P33 layer.
- Co-extrusion may be performed after merging so that the resin compositions are laminated. If the melt viscosity difference among the P31 layer, the P32 layer, and the P33 layer is large, it is preferable to use a multi-manifold from the viewpoint of suppressing stacking unevenness.
- the base P1 layer that has been set in advance is bonded to the surface on which the P2 layer is provided and the P3 layer.
- the laminated sheet of the present invention can be obtained by roll-rolling and roll pressure bonding.
- the temperature of the cooling body such as a casting drum is preferably 10 ° C. or higher and 40 ° C. or lower from the viewpoint of curl property of the obtained sheet.
- the laminated sheet of the present invention obtained by the above-described method may be subjected to processing such as heat treatment or aging as necessary within the range where the effects of the present invention are not impaired.
- the glass transition temperature of the resin constituting the P1 layer is ⁇ 10 ° C. or lower, more preferably glass transition temperature ⁇ 20 ° C. or lower, and further preferably glass transition temperature ⁇ 30, due to the flatness of the sheet. It is below °C.
- the heat treatment time is 5 seconds or more and 48 hours or less. By performing the heat treatment, the adhesion of the laminated sheet of the present invention can be improved.
- corona treatment or plasma treatment may be performed.
- the solar cell is characterized by using the laminated sheet of the present invention as a back sheet.
- the laminated sheet of the present invention By using the laminated sheet of the present invention, it becomes possible to increase the durability or to make it thinner as compared to conventional solar cells.
- An example of the configuration is shown in FIG.
- a power generating element connected with a lead wire for taking out electricity (not shown in FIG. 1) is sealed with a transparent sealant layer 2 such as EVA resin, a transparent substrate 4 such as glass, and the laminate of the present invention.
- seat is bonded and comprised as the solar cell backsheet 1, it is not limited to this, It can use for arbitrary structures.
- unit of this invention was shown in FIG. 1, it is also possible to use the composite sheet of the lamination sheet of this invention and another film according to the other required required characteristic.
- the above-described solar cell backsheet 1 is installed on the back surface of the sealant layer 2 in which the power generating element is sealed.
- the P1 layer of the laminated sheet of the present invention is disposed at least on the side opposite to the sealant layer 2 (6 in FIG. 1).
- the P3 layer is disposed so as to be positioned on the sealing material layer 2 side. This is preferable in that the adhesion to the stopper can be further increased.
- the power generating element 3 converts light energy of sunlight into electric energy, and is based on crystalline silicon, polycrystalline silicon, microcrystalline silicon, amorphous silicon, copper indium selenide, compound semiconductor, dye enhancement Arbitrary elements such as a sensitive system can be used in series or in parallel according to the desired voltage or current depending on the purpose. Since the transparent substrate 4 having translucency is located on the outermost surface layer of the solar cell, a transparent material having high weather resistance, high contamination resistance, and high mechanical strength characteristics in addition to high transmittance is used. In the solar cell using the laminated sheet of the present invention, the transparent substrate 4 having translucency can use any material as long as the above characteristics are satisfied. Examples thereof include glass, ethylene tetrafluoride-ethylene copolymer.
- EFE polyvinyl fluoride resin
- PVDF polyvinylidene fluoride resin
- TFE polytetrafluoroethylene resin
- FEP tetrafluoroethylene-hexafluoropropylene copolymer
- CFE ethylene chloride resin
- olefin resins acrylic resins, and mixtures thereof.
- glass it is more preferable to use a tempered glass.
- stretched the said resin uniaxially or biaxially from a viewpoint of mechanical strength is used preferably.
- the adhesiveness with EVA resin etc. which are the sealing materials of an electric power generation element, it is also preferably performed to give the surface a corona treatment, a plasma treatment, an ozone treatment, and an easy adhesion treatment. .
- the sealing material 2 for sealing the power generation element is formed by covering and fixing the unevenness of the surface of the power generation element with a resin, protecting the power generation element from the external environment, and having a light-transmitting base material for the purpose of electrical insulation
- a material having high transparency, high weather resistance, high adhesion, and high heat resistance is used to adhere to the backsheet and the power generation element.
- Examples thereof include ethylene-vinyl acetate copolymer (EVA), ethylene-methyl acrylate copolymer (EMA), ethylene-ethyl acrylate copolymer (EEA) resin, ethylene-methacrylic acid copolymer (EMAA), Ionomer resins, polyvinyl butyral resins, and mixtures thereof are preferably used.
- the solar cell using the laminated sheet of the present invention is not limited to outdoor use and indoor use, such as a solar power generation system and a power source for small electronic components, and can be suitably used for various uses.
- Measurement method and evaluation method of characteristics (1) Total thickness of laminated sheet and thickness of P1, P2, and P3 layers Using a microtome, a small piece cut in a direction perpendicular to the surface of the laminated sheet is prepared, and the cross section is taken as a field emission scanning electron microscope.
- the image was taken with a magnification of 3000 times using "JSM-6700F” (manufactured by JEOL Ltd.). From the cross-sectional photograph, the total thickness of the laminated sheet and the thickness of each of the P1, P2, and P3 layers were measured, and the thickness was obtained by calculating back from the magnification. In addition, the thickness used the cross-sectional photograph of five places arbitrarily selected from the mutually different measurement visual field, and used the average value.
- the washing operation was repeated until no turbidity occurred even when acetone was added to the washing solution after centrifugation.
- the mass wt1 ′ (g) of the obtained inorganic particles was determined, and the inorganic particle content Wt1 was measured from the following formula (3).
- P1 layer inorganic particle content (% by mass) Wt1 (wt1 ′ / wt1) ⁇ 100 (3)
- the solvent to be dissolved was changed to ortho-dichlorobenzene (100 ° C.), and the inorganic particle content Wt2 of the P3 layer was determined in the same manner as in the P1 layer.
- the interlayer adhesion strength of the laminated sheet was measured based on JIS K 6854-3 (1994 edition).
- the interlayer refers to an interlayer that can be peeled at the interface, such as between the P1 layer and the P2 layer and between the P2 layer and the P3 layer.
- the laminated sheet was cut out to 15 mm ⁇ 150 mm, the interlayer adhesion strength between the polyester layer and the olefin layer was measured.
- the test piece was immersed in ethyl acetate and allowed to stand in an atmosphere of 25 ° C. and 60% RH for 24 hours before measurement.
- peel strength is 15N / 15mm or more: S
- peel strength is 10 N / 15 mm or more and less than 15 N / 15 mm: A
- peel strength is 5N / 15mm or more and less than 10N / 15mm:
- B When peel strength is less than 5N / 15mm: C S to B are good, and S is the best among them.
- Adhesive strength with the sealing material was measured based on JIS K 6854-2 (1994 edition). An EVA sheet is stacked on the olefin layer surface of the laminated sheet, a semi-tempered glass with a thickness of 3 mm is further stacked thereon, and after evacuation using a commercially available glass laminator, heating is performed at 135 ° C. under a load of 29.4 N / cm 2 . A pseudo solar cell module sample was produced by pressing for 15 minutes. As the EVA sheet, a 500 ⁇ m thick sheet manufactured by Sanvik Co., Ltd. was used.
- the adhesive strength is 60 N / 10 mm or more: SS
- the adhesive strength is 40 N / 10 mm or more and less than 60 N / 10 mm: S
- the adhesive strength is 30 N / 10 mm or more and less than 40 N / 10 mm:
- the adhesive strength is 20 N / 10 mm or more and less than 30 N / 10 mm: B
- C SS to B are good, and SS is the best among them.
- Adhesive strength with sealant (EVA) after wet heat resistance test The EVA sheet is stacked on the olefin layer surface of the laminated sheet, and a semi-tempered glass with a thickness of 3 mm is further stacked thereon, and a commercially available glass laminator is used. After vacuuming, press processing is performed at 135 ° C. under a heating condition of 29.4 N / cm 2 for 15 minutes to prepare a pseudo solar cell module sample. Using a pressure cooker manufactured by Tabay Espec Co., Ltd., the temperature is 120 ° C. The treatment was performed for 48 hours under the condition of a relative humidity of 100% RH.
- seat after a wet heat test was measured, and it determined as follows.
- the adhesive strength is 60 N / 10 mm or more: SS
- the adhesive strength is 40 N / 10 mm or more and less than 60 N / 10 mm: S
- the adhesive strength is 30 N / 10 mm or more and less than 40 N / 10 mm: A
- the adhesive strength is 20 N / 10 mm or more and less than 30 N / 10 mm: B
- the adhesive strength is less than 20 N / 10 mm: C Cannot measure adhesive strength due to sheet breakage: D SS to B are good, and SS is the best among them.
- ⁇ b K ⁇ K0 (5)
- Ultraviolet treatment is performed under the conditions of a temperature of 65 ° C., a relative humidity of 50% RH, and an intensity of 150 W / m 2 (light source: xenon lamp, wavelength range: 290 to 400 nm) using a Xenon weather meter SC750 manufactured by Suga Test Instruments Co., Ltd.
- the P1 layer side was irradiated for 1000 hours.
- the method for obtaining the b value is as follows. Using a spectroscopic color difference meter SE-2000 (manufactured by Nippon Denshoku Industries Co., Ltd.), the b value of the P1 layer was measured in the reflection mode according to JIS Z-8722 (2000).
- the ultraviolet resistance of the laminated sheet was determined as follows.
- S When the color change ⁇ b is 3 or less: S When the color change ⁇ b is greater than 3 and less than or equal to 6: A When the color tone change ⁇ b is greater than 6 and 10 or less: B When the color change ⁇ b is larger than 10: C S to B are good, and S is the best among them.
- the measurement unit used an integrating sphere (model number 130-0632) with a diameter of 60 mm, and a 10 ° inclined spacer was attached.
- aluminum oxide (model number 210-0740) was used for the standard white plate.
- it when it is a laminated sheet, it measures from the polyester-type resin layer side of a laminated sheet.
- Partial discharge voltage was determined using a partial discharge tester KPD2050 (manufactured by Kikusui Electronics Co., Ltd.). The test conditions are as follows.
- the output voltage application pattern on the output sheet is a pattern in which the first stage simply increases the voltage from 0 V to a predetermined test voltage, the second stage is a pattern that maintains a predetermined test voltage, and the third stage is a predetermined test A pattern composed of three stages of patterns in which the voltage is simply dropped from 0 to 0 V is selected. ⁇
- the frequency is 50 Hz.
- the test voltage is 1 kV.
- the first stage time T1 is 10 sec
- the second stage time T2 is 2 sec
- the third stage time T3 is 10 sec.
- the counting method on the pulse count sheet is “+” (plus), and the detection level is 50%.
- the amount of charge in the range sheet is in the range 1000 pc.
- ⁇ In the protection sheet, enter 2 kV after checking the voltage check box.
- the pulse count is 100,000.
- the start voltage is 1.0 pc and the extinction voltage is 1.0 pc.
- the measurement was carried out at 10 arbitrary positions in the film plane, and the average value was defined as the partial discharge voltage V0. The measurement was performed using a measurement sample that was left overnight in a room at 23 ° C. and 65% Rh.
- partial discharge voltage When the partial discharge voltage is 950 V or more: S When partial discharge voltage is 700V or more and less than 950V: A When partial discharge voltage is 300V or more and less than 700V: B When partial discharge voltage is less than 300V: C S to B are good, and S is the best among them.
- the obtained elution curve molecular weight curve and the molecular weight calibration curve are overlapped to obtain the molecular weight corresponding to each outflow time, and the value calculated by the following formula (7) is taken as the number average molecular weight.
- Number average molecular weight (Mn) ⁇ NiMi / ⁇ Ni (7) (Here, Ni is the molar fraction, and Mi is the molecular weight of each elution position of the GPC curve obtained via the molecular weight calibration curve.)
- the organic fine particles and the inorganic fine particles are used in the polyester layer used for the measurement. , Metal, metal salts, other additives, etc.
- the polyester layer contains additives such as plasticizers, surfactants, dyes, etc., after removing insoluble components, reprecipitation method, recrystallization method, chromatography method, extraction method After removing the insoluble additive in the same manner as described above, the solution was prepared again and measured.
- additives such as plasticizers, surfactants, dyes, etc.
- Tmeta before melting peak, melting point Tm A value obtained by differential scanning calorimetry (hereinafter referred to as DSC), which is obtained in the temperature raising process (temperature raising rate: 20 ° C./min), and is determined from 25 ° C. to 300 ° C. by a method based on JIS K-7121 (1999).
- DSC differential scanning calorimetry
- the minute endothermic peak temperature before the crystal melting peak in the differential scanning calorimetry chart obtained by raising the temperature at a rate of temperature rise of 20 ° C./min until Tmeta is maintained at 300 ° C. for 5 minutes, and then 25 ° C. or less
- the temperature at the top of the crystal melting peak in the differential scanning calorimetry chart obtained by rapidly cooling from 25 ° C. to 300 ° C. at a rate of temperature increase of 20 ° C./min is defined as Tm.
- the transparent base material / first sealing material / power generating element / second sealing material / laminated sheet are stacked in this order, and vacuum lamination is performed using a vacuum laminating apparatus.
- a vacuum laminating apparatus 100 solar cell modules were produced at 150 ° C., a vacuum state time of 5 minutes, and a press time of 10 minutes, and the processability in the manufacturing process of the solar cell module was evaluated according to the following criteria.
- PET-A raw materials Examples 1 to 7, 10 to 35, Comparative Examples 1 to 3, 5 to 10.
- a polycondensation reaction was performed using 100 mol% of terephthalic acid as the dicarboxylic acid component, 100 mol% of ethylene glycol as the diol component, and magnesium acetate, antimony trioxide, and phosphorous acid as the catalyst.
- the obtained polyethylene terephthalate was dried and crystallized at 160 ° C. for 6 hours, followed by solid-phase polymerization at 220 ° C. and a vacuum degree of 0.3 Torr for 9 hours, melting point 255 ° C., intrinsic viscosity 0.80, COOH End group amount 10 eq.
- PET-A polyethylene terephthalate
- PET-B raw material (Example 36) A polycondensation reaction was performed using 100 mol% of terephthalic acid as the dicarboxylic acid component, 100 mol% of ethylene glycol as the diol component, and magnesium acetate, antimony trioxide, and phosphorous acid as the catalyst. Next, the obtained polyethylene terephthalate was dried and crystallized at 160 ° C. for 6 hours, melting point 255 ° C., intrinsic viscosity 0.65, COOH end group amount 25 eq. A polyethylene terephthalate (PET-B) raw material of / t was obtained.
- PET-B polyethylene terephthalate
- PET-C raw material (Example 37) A polycondensation reaction was performed using 100 mol% of terephthalic acid as the dicarboxylic acid component, 100 mol% of ethylene glycol as the diol component, and magnesium acetate, antimony trioxide, and phosphorous acid as the catalyst. Next, the obtained polyethylene terephthalate was dried and crystallized at 160 ° C. for 6 hours, followed by solid phase polymerization at 220 ° C. and a vacuum degree of 0.3 Torr for 12 hours, melting point 255 ° C., intrinsic viscosity 1.18, COOH End group amount 15 eq. A polyethylene terephthalate (PET-C) raw material of / t was obtained.
- PET-C polyethylene terephthalate
- PEN raw material (Example 8) To a mixture of 100 parts by mass of dimethyl 2,6-naphthalenedicarboxylate and 60 parts by mass of ethylene glycol, 0.03 part by mass of manganese acetate tetrahydrate salt is added, and the temperature is gradually increased from 150 ° C. to 240 ° C. The transesterification was carried out while raising the temperature. In the middle, when the reaction temperature reached 170 ° C., 0.024 parts by mass of antimony trioxide was added. When the reaction temperature reached 220 ° C., 0.042 parts by mass (corresponding to 2 mmol%) of 3,5-dicarboxybenzenesulfonic acid tetrabutylphosphonium salt was added.
- the reaction product is transferred to a polymerization apparatus, heated to a temperature of 290 ° C., subjected to a polycondensation reaction under a high vacuum of 30 Pa, and the stirring torque of the polymerization apparatus is a predetermined value (specifically depending on the specifications of the polymerization apparatus).
- the value indicated by polyethylene-2,6-naphthalate having an intrinsic viscosity of 0.65 in this polymerization apparatus was a predetermined value).
- the obtained polyethylene terephthalate was dried and crystallized at 160 ° C. for 6 hours, followed by solid phase polymerization at 220 ° C. and a vacuum degree of 0.3 Torr for 9 hours, melting point 255 ° C., intrinsic viscosity 0.70, COOH End group amount 25 eq.
- a polyethylene naphthalate (PEN) raw material of / t was obtained.
- PBT raw material (Example 9) Toraycon 1200M manufactured by Toray Industries, Inc. was used. Melting point 255 ° C., intrinsic viscosity 1.23, COOH end group amount 23 eq. / T.
- PET-based titanium oxide master A (Examples 1 to 7, Examples 11 to 35, Comparative Examples 5 to 10) Above 1. 100 parts by mass of the PET-A raw material obtained in accordance with the above section and 100 parts by mass of rutile titanium oxide particles having an average particle diameter of 210 nm are melt-kneaded in a vented extruder at 290 ° C. to obtain a titanium oxide raw material (PETa-TiO 2 ). Was made.
- PET-based titanium oxide master B (Example 36) 2. 100 parts by mass of the PET-B raw material obtained in accordance with the above item and 100 parts by mass of rutile titanium oxide particles having an average particle diameter of 210 nm are melt-kneaded in a vented extruder at 290 ° C. to obtain a titanium oxide raw material (PETb—TiO 2 ). Was made.
- PET-based titanium oxide master C (Example 37) 3. above. 100 parts by mass of the PET-C raw material obtained according to the above item and 100 parts by mass of rutile titanium oxide particles having an average particle diameter of 210 nm are melt-kneaded in a vented extruder at 290 ° C. to obtain a titanium oxide raw material (PETc—TiO 2 ). Was made.
- PEN-based titanium oxide master (Example 8) 4. above. 100 parts by mass of the PEN raw material obtained according to the above and 100 parts by mass of rutile titanium oxide particles having an average particle diameter of 210 nm are melt-kneaded in a vented 300 ° C. extruder to produce a titanium oxide raw material (PEN-TiO 2 ). did.
- PBT-based titanium oxide master (Example 9) 5. above. 100 parts by mass of the PBT raw material obtained in accordance with the above section and 100 parts by mass of rutile titanium oxide particles having an average particle diameter of 210 nm are melt-kneaded in a vented 260 ° C. extruder to produce a titanium oxide raw material (PBT-TiO 2 ). did.
- Coating agent A (Examples 1 to 13, 19 to 37, Comparative examples 2 and 5 to 10) Using water as a diluent solvent, maleic anhydride-modified polypropylene (maleic anhydride-modified PP) resin aqueous dispersion is 50% by mass, aqueous polyurethane resin coating is 48% by mass, epoxy crosslinking agent is 2% by mass, fluorine An emulsion solution having a solid content of 15% by mass was prepared by adding a system surfactant, manufactured by Kyoyo Chemical Co., Ltd., plus Coat RY-2 in a proportion of 0.2% by mass. 2.
- a system surfactant manufactured by Kyoyo Chemical Co., Ltd.
- Coating agent B 96% by mass of water-based polyurethane resin coating, 4% by mass of epoxy crosslinking agent, 0.2% by mass of Fluorosurfactant, manufactured by Kyoyo Chemical Co., Ltd. Thus, an emulsion solution having a solid content of 15% by mass was prepared. 3.
- Coating agent C (Example 15) Using water as a diluent solvent, maleic anhydride-modified polypropylene (maleic anhydride-modified PP) resin aqueous dispersion is 5% by mass, aqueous polyurethane resin coating is 93% by mass, epoxy crosslinking agent is 2% by mass, fluorine An emulsion solution having a solid content of 15% by mass was prepared by adding a system surfactant, manufactured by Kyoyo Chemical Co., Ltd., plus Coat RY-2 in a proportion of 0.2% by mass. 4).
- a system surfactant manufactured by Kyoyo Chemical Co., Ltd.
- Coating agent D Maleic anhydride-modified polypropylene (maleic anhydride-modified PP) resin aqueous dispersion is 50% by mass, aqueous polyurethane resin coating is 50% by mass, fluorosurfactant, manufactured by Toyo Chemical Co., Ltd., plus Coat RY-2 is 0.
- An emulsion solution having a solid content of 15% by mass was prepared in the same manner as Coating C, except that the proportion was 2% by mass. 5.
- Coating E (Example 17) A maleic anhydride-modified polypropylene (maleic anhydride-modified PP) resin aqueous dispersion is 88% by mass, an aqueous polyurethane resin coating is 10% by mass, an epoxy crosslinking agent is 2% by mass, a fluorosurfactant, manufactured by Toyo Chemical Co., Ltd. An emulsion solution having a solid content of 15% by mass was prepared in the same manner as Coating C, except that the plus coat RY-2 was blended so as to have a proportion of 0.2% by mass. 6).
- Coating agent F (Example 18) Maleic anhydride-modified polypropylene (maleic anhydride-modified PP) resin aqueous dispersion is 89% by mass, aqueous polyurethane resin coating is 9% by mass, epoxy cross-linking agent is 2% by mass, fluorine-based surfactant, manufactured by Toyo Chemical Co., Ltd. A solution having a solid content of 15% by mass was prepared in the same manner as Coating C, except that the proportion of Pluscoat RY-2 was 0.2% by mass.
- EPBC Olefin raw material
- Tm melting point
- MFR melt float rate
- PP Examples 1 to 19, Examples 22 to 24, Examples 27 to 37, Comparative Examples 5 to 10; P32 layer
- Homo PP having a Tm of 165 ° C. and an MFR of 7 g / 10 min at 230 ° C. was used.
- EPC Ethylene was copolymerized at a ratio of 4.2% by mass, and an EPC having a Tm of 142 ° C. and an MFR of 6 g / 10 min at 230 ° C. was used.
- LLDPE (Examples 1 to 20, Example 22, Examples 24 to 34, Example 37, Comparative Examples 5 to 10; P33 layer, Example 19; P31 layer)
- Polyolefin Elastomer A (Example 24) A non-crosslinked elastomer resin having a Tm of 160 ° C., an MFR of 6 g / 10 min at 230 ° C., and a density of 0.9 kg / m 3 was used. 6).
- Polyolefin elastomer B (Examples 34 to 35; P31 layer, Example 35; P33 layer) An olefin elastomer resin having a Tm of 59 ° C., an MFR at 190 ° C. of 5.0 dg / min, and a density of 0.87 kg / m 3 was used.
- Acid-modified olefin (Example 22) An acid-modified olefin resin having a Tm of 120 ° C., an MFR at 190 ° C. of 3.5 g / 10 min, and a density of 0.9 g / m 3 was used.
- PP-based titanium oxide master (Examples 1 to 19, Examples 22 to 24, Examples 27 to 37, Comparative Examples 5 to 10) 100 parts by mass of PP resin and 100 parts by mass of rutile-type titanium oxide particles having an average particle diameter of 210 nm were melt-kneaded in a vented 300 ° C. extruder to produce a titanium oxide raw material (PP—TiO 2 ).
- EPBC-based titanium oxide master 100 parts by mass of EPBC resin and 100 parts by mass of rutile titanium oxide particles having an average particle diameter of 210 nm were melt-kneaded in a vented 300 ° C. extruder to produce a titanium oxide raw material (EPBC-TiO 2 ).
- the unstretched single layer film was preheated with a roll group heated to a temperature of 80 ° C., and then stretched 3.3 times in the longitudinal direction (longitudinal direction) using a heating roll having a temperature of 85 ° C.
- a uniaxially stretched film was obtained by cooling with a roll group at a temperature of ° C.
- the coating corresponding to the numbers of Examples and Comparative Examples is # 8 metalling. It was applied with a bar.
- the composition of the P31 layer, the P32 layer, and the P33 layer shown in Table 1 is obtained using each olefin raw material described in the section “(Olefin raw material)”.
- the layers are melted and kneaded in an extruder at 300 ° C., and the layers are joined by a multi-manifold so that the layers are laminated in the order of P31 layer / P32 layer / P33 layer, and the die is formed so that the lamination ratio becomes 1/4/1 in order.
- the characteristics of the obtained laminated sheet were evaluated. As a result, as shown in Table 2, the sheet was found to be excellent in various properties such as flatness and interlayer adhesion.
- Example 2 the P2 layer was thin and the initial interlayer adhesion was slightly inferior.
- Example 4 was slightly inferior in flatness because the thickness ratio P1 / P3 was small.
- Example 5 had a characteristic that the water vapor transmission rate was slightly inferior because the thickness ratio P1 / P3 was large.
- Example 6 had a characteristic that the total thickness was small and the water vapor transmission rate and the partial discharge voltage were slightly inferior.
- Example 7 had a characteristic that the total thickness was thick and the processability was slightly inferior.
- Example 10 was inferior in UV resistance because the P1 layer did not contain titanium oxide.
- Example 15 since the ratio of W2a / W2b of the P2 layer was small, the initial interlayer adhesion was A determination.
- Example 16 was slightly inferior in interlayer adhesion after the wet heat resistance test because the P2 layer did not contain the crosslinking agent epoxy.
- Example 19 since the olefin species of the P3 layer was changed, the initial interlayer adhesion was A judgment.
- Example 22 to 25 and 34 to 35 the olefin species of the P3 layer was changed, so the characteristics were equal to or higher than those of Example 1.
- Comparative Example 5 had a characteristic that the thickness of the P2 layer was thin and the initial interlayer adhesion was poor.
- Comparative Example 6 was a characteristic in which the P2 layer was thick and inferior in initial interlayer adhesion.
- Comparative Example 7 was inferior in flatness because the thickness ratio P1 / P3 was small.
- Comparative Example 8 was inferior in water vapor transmission rate because the thickness ratio P1 / P3 was large.
- Comparative Example 9 had a characteristic that the total thickness was small and the water vapor transmission rate and partial discharge voltage were inferior.
- Comparative Example 10 had a characteristic that the total thickness was large and the processability was poor.
- Example 3 “PET raw material A” and “PET-based titanium oxide master A” described in the section “(Polyester resin raw material)”, which was vacuum-dried at 180 ° C. for 2 hours, were mixed to the concentrations shown in Table 1 and extruded at 290 ° C. It was melt-kneaded in the machine and introduced into the T die die. Subsequently, it was melt-extruded into a sheet form from a T-die die and adhered and cooled and solidified by an electrostatic application method on a drum maintained at a surface temperature of 25 ° C. to obtain an unstretched single layer film.
- the unstretched single layer film was preheated with a roll group heated to a temperature of 80 ° C., and then stretched 3.3 times in the longitudinal direction (longitudinal direction) using a heating roll having a temperature of 85 ° C.
- a uniaxially stretched film was obtained by cooling with a roll group at a temperature of ° C. While holding both ends of the obtained uniaxially stretched film with a clip, it is led to a preheating zone at a temperature of 90 ° C. in the tenter, and is then continuously heated at 100 ° C. in a direction perpendicular to the longitudinal direction (width direction). The film was stretched 3.8 times. Subsequently, heat treatment was performed at 200 ° C.
- the intrinsic viscosity IV and COOH end group amount of the P1 layer were as shown in Table 1.
- the coating agent A was applied using a gravure coater under the following coating conditions to provide an adhesive layer.
- Coating conditions Dry film thickness 3.0 ⁇ m, drying oven set temperature 120 ° C.
- Aging After coating and winding, aging for 2 days in a room at 40 ° C.
- the extruder 2 and the extruder 3 Each of the layers is melted and kneaded in an extruder at 300 ° C.
- the characteristics of the obtained laminated sheet were evaluated. As a result, as shown in Table 2, the P2 layer was thick and the initial interlayer adhesion was slightly inferior.
- Example 8 “PEN raw material” and “PEN-based titanium oxide master” described in the section of “(Polyester resin raw material)”, which was vacuum-dried at 180 ° C. for 2 hours, were mixed to the concentrations shown in Table 1 and placed in an extruder at 300 ° C. It was melt-kneaded and introduced into a T die die. Subsequently, it was melt-extruded into a sheet form from a T-die die and adhered and cooled and solidified by an electrostatic application method on a drum maintained at a surface temperature of 25 ° C. to obtain an unstretched single layer film.
- the unstretched monolayer film was preheated with a roll group heated to a temperature of 130 ° C., and then stretched 4.2 times in the longitudinal direction (longitudinal direction) using a heating roll having a temperature of 145 ° C.
- a uniaxially stretched film was obtained by cooling with a roll group at a temperature of ° C.
- the coating agent A was applied with a # 8 metering bar.
- Example 9 “PBT raw material” and “PBT-based titanium oxide master” described in the section “(Polyester resin raw material)”, which was vacuum-dried at 180 ° C. for 2 hours, were mixed to the concentrations shown in Table 1 and placed in an extruder at 260 ° C. It was melt-kneaded and introduced into a T die die. Subsequently, it was melt-extruded into a sheet form from a T-die die and adhered and cooled and solidified by an electrostatic application method on a drum maintained at a surface temperature of 25 ° C. to obtain a 150 ⁇ m unstretched single layer film.
- a laminated sheet was obtained in the same manner as in Example 1 except that coating agent A was applied to one side of the film obtained above using a gravure coater under the following coating conditions, and an adhesive layer was provided.
- Coating conditions Dry film thickness 0.4 ⁇ m, drying oven set temperature 120 ° C
- Aging After coating and winding, aging for 2 days in a room at 40 ° C.
- the characteristics of the laminated sheet obtained were evaluated. As a result, as shown in Table 2, it was found that the sheet was excellent in various properties such as flatness.
- Example 20 In the process of the P3 layer, using the extruders 1 and 2, the composition of the P32 layer shown in Table 1 is the “EPBC” and “EPBC base titanium oxide master” described in the section of “(Olefin raw material)” which becomes the P32 layer.
- the “EPC” and “LLDPE” described in the section “(Olefin raw material)” to be the P33 layer are charged into the extruder 2 so as to have the composition of the P33 layer shown in Table 1.
- a laminated sheet having the structure shown in Table 1 was prepared in the same manner as in Example 1 except that each was melt-kneaded in an extruder at 300 ° C.
- a laminated sheet having the structure shown in Table 1 was prepared in the same manner as in Example 1 except that the mixture was melt-kneaded in the extruder and discharged from the die.
- the characteristics of the obtained laminated sheet were evaluated, as shown in Table 2, since the olefin type of the P3 layer was changed, the initial interlayer adhesion and the adhesive strength with EVA were slightly inferior.
- Example 26 In the process of the P3 layer, using the extruders 1 and 2, "EPBC” described in the section of "(Olefin raw material)" to be the P31 layer is transferred to the extruder 1, and "(Olefin raw material)” to be the P33 layer.
- the “EPC” and “LLDPE” described in 1 are put into the extruder 2 so as to have the composition of the P33 layer shown in Table 1, and melt-kneaded in an extruder at 300 ° C., respectively, so that the lamination ratio becomes 1/1 in order.
- a laminated sheet having the structure shown in Table 1 was prepared in the same manner as in Example 1 except that the sheet was discharged from the base.
- Example 36 In the process of the P1 layer, the concentration of “PET raw material B” and “PET base titanium oxide master B” described in the section “(Polyester resin raw material)”, which is vacuum-dried at 180 ° C. for 2 hours, is set to the concentrations shown in Table 1.
- a laminated sheet having the configuration shown in Table 1 was prepared in the same manner as in Example 1 except that it was prepared.
- a laminated sheet having the configuration shown in Table 1 was prepared in the same manner as in Example 1 except that it was prepared.
- the intrinsic viscosity IV of the PET raw material forming the P1 layer was high, the filtration pressure of the extruder increased in the film forming process of the P1 layer, and the film stretchability and flatness in the stretching process were further deteriorated.
- characteristic evaluation was performed about the obtained lamination sheet, it was a result in which interlayer adhesiveness was a little inferior because the flatness of P1 layer worsened.
- Comparative Example 1 “PET raw material A” described in the section “(Polyester resin raw material)”, which was vacuum-dried at 180 ° C.
- the unstretched single layer film was preheated with a roll group heated to a temperature of 80 ° C., and then stretched 3.3 times in the longitudinal direction (longitudinal direction) using a heating roll having a temperature of 85 ° C.
- a uniaxially stretched film was obtained by cooling with a roll group at a temperature of ° C. While holding both ends of the obtained uniaxially stretched film with a clip, it is led to a preheating zone at a temperature of 90 ° C. in the tenter, and is then continuously heated at 100 ° C. in a direction perpendicular to the longitudinal direction (width direction). The film was stretched 3.8 times. Subsequently, heat treatment was performed at 200 ° C. for 20 seconds in a heat treatment zone in the tenter, and further relaxation treatment was performed in the 4% width direction at 210 ° C. Subsequently, the film was gradually cooled to obtain a biaxially stretched film having a film thickness of 150 ⁇ m. Characteristic evaluation was performed about the obtained lamination sheet. As a result, as shown in Table 2, it was found that the sheet was inferior in water vapor transmission rate and the like.
- PET raw material A described in the section “(Polyester resin raw material)”, which was vacuum-dried at 180 ° C. for 2 hours, was melt-kneaded in an extruder at 290 ° C. and introduced into a T-die die. Subsequently, it was melt-extruded into a sheet form from a T-die die and adhered and cooled and solidified by an electrostatic application method on a drum maintained at a surface temperature of 25 ° C. to obtain an unstretched single layer film.
- the unstretched single layer film was preheated with a roll group heated to a temperature of 80 ° C., and then stretched 3.3 times in the longitudinal direction (longitudinal direction) using a heating roll having a temperature of 85 ° C.
- a uniaxially stretched film was obtained by cooling with a roll group at a temperature of ° C.
- the coating agent A was applied with a # 8 metering bar.
- the unstretched single layer film was preheated with a roll group heated to a temperature of 80 ° C., and then stretched 3.3 times in the longitudinal direction (longitudinal direction) using a heating roll having a temperature of 85 ° C.
- a uniaxially stretched film was obtained by cooling with a roll group at a temperature of ° C. While holding both ends of the obtained uniaxially stretched film with a clip, it is led to a preheating zone at a temperature of 90 ° C. in the tenter, and is then continuously heated at 100 ° C. in a direction perpendicular to the longitudinal direction (width direction). The film was stretched 3.8 times. Subsequently, heat treatment was performed at 200 ° C.
- Back sheet 2 Sealing material 3: Power generation element 4: Transparent substrate 5: Surface on the sealing material 2 side of the solar cell backsheet 6: Surface on the opposite side of the sealing material 2 of the solar cell backsheet
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Abstract
Description
本発明におけるP1層は、ポリエステル系樹脂を主たる構成成分とする。P1層は、以下の説明で積層構造を有する場合があるが、その場合は、P1層としての積層構造全体として、ポリエステル系樹脂を主たる構成成分とするものとする。ここで、主たる構成成分とは、該P1層に対してポリエステル系樹脂が50質量%を超えて含有されていることをいう。P1層に用いられるポリエステル系樹脂は、具体的にはポリエチレンテレフタレート、ポリエチレン-2、6-ナフタレート、ポリプロピレンテレフタレート、ポリブチレンテレフタレート、ポリ乳酸などが挙げられる。また、本発明に用いられるポリエステル系樹脂は、1)ジカルボン酸成分もしくはそのエステル形成性誘導体(以下、「ジカルボン酸成分」と総称する)とジオール成分の重縮合、2)一分子内にカルボン酸もしくはカルボン酸誘導体部分と水酸基を有する化合物の重縮合、および1)2)の組み合わせにより得ることができる。また、ポリエステル系樹脂の重合は常法により行うことができる。
一方、ポリイソシアネート成分としては、芳香族、脂肪族および脂環族の公知のジイソシアネート類の1種または2種以上の混合物を用いることができる。ジイソシアネート類の具体例としては、トリレンジジイソシアネート、4,4′-ジフェニルメタンジイソシアネート、1,3-フェニレンジイソシアネート、ヘキサメチレンジイソシアネート、キシリレンジイソシアネート、1,5-ナフチレンジイソシアネート、イソホロンジイソシアネート、ジメリールジイソシアネート、リジンジイソシアネート、水添4,4′-ジフェニルメタンジイソシアネート、水添トリレンジジイソシアネート、ダイマー酸のカルボキシル基をイソシアネート基に転化したダイマージイソシアネート、およびこれらのアダクト体、ビウレット体、イソシアヌレート体等が挙げられる。また、ジイソシアネート類にはトリフェニルメタントリイソシアネート、ポリメチレンポリフェニルイソシアネート等の3官能以上のポリイソシアネート類を用いてもよい。
また、ポリウレタン系樹脂に陰イオン性基を導入するには、カルボキシル基、スルホン酸基、硫酸基、リン酸基等を有するポリオール成分を用いればよい。カルボキシル基を有するポリオール化合物としては、3,5-ジヒドロキシ安息香酸、2,2-ビス(ヒドロキシメチル)プロピオン酸、2,2-ビス(ヒドロキシエチル)プロピオン酸、2,2-ビス(ヒドロキシプロピル)プロピオン酸、ビス(ヒドロキシメチル)酢酸、ビス(4-ヒドロキシフェニル)酢酸、2,2-ビス(4-ヒドロキシフェニル)ペンタン酸、酒石酸、N,N-ジヒドロキシエチルグリシン、N,N-ビス(2-ヒドロキシエチル)-3-カルボキシル-プロピオンアミド等が挙げられる。
鎖長延長剤を用いてポリウレタン系樹脂の分子量を適宜調整することもできる。鎖長延長剤としては、イソシアネート基と反応することができるアミノ基や水酸基等の活性水素を2個以上有する化合物が挙げられ、例えば、ジアミン化合物、ジヒドラジド化合物、グリコール類を用いることができる。
また、P2層には、P1層とP3層の接着力を上げるために、変性ポリオレフィン樹脂を含むことが好ましい。変性ポリオレフィン樹脂とは、不飽和カルボン酸またはその無水物で変性された酸変性ポリオレフィン、或いはシラン系カップリング剤で変性されたポリオレフィンを主成分(ここで、主成分とは該樹脂全体に対して50質量%以上含有することをいう)とする樹脂をいう。
本発明におけるP2層の変性ポリオレフィン樹脂は、不飽和カルボン酸またはその無水物、或いはシラン系カップリング剤で変性されたポリオレフィンであり、例えば、不飽和カルボン酸またはその無水物としては、アクリル酸、メタクリル酸、マレイン酸、無水マレイン酸、シトラコン酸、無水シトラコン酸、イタコン酸、無水イタコン酸、或いはこれらの誘導体のモノエポキシ化合物と上記酸とのエステル化合物、分子内にこれらの酸と反応しうる基を有する重合体と酸との反応生成物などが挙げられる。また、これらの金属塩も使用することができる。また、シラン系カップリング剤としては、ビニルトリエトキシシラン、メタクロイルオキシトリメトキシシラン、γ-メタクリロイルオキシプロピルトリアセチルオキシシシランなどを挙げることができる。これらの中でも、ポリオレフィン樹脂への導入のし易さの点から、無水マレイン酸、アクリル酸、メタクリル酸が好ましく、特に無水マレイン酸が好ましい。これらの不飽和カルボン酸または無水物は、ポリオレフィン樹脂中に共重合されていれば良く、その形態は限定されるものではなく、例えばランダム共重合、ブロック共重合、グラフト共重合等が挙げられる。
また、不飽和カルボン酸をポリオレフィン樹脂へ導入する方法は、特に限定されないが、例えば、ラジカル発生剤の存在下で、ポリオレフィン樹脂と不飽和カルボン酸とをポリオレフィン樹脂の融点以上に加熱溶融して反応させる方法や、ポリオレフィン樹脂を有機溶剤に溶解させた後、ラジカル発生剤の存在下で加熱、撹拌して反応させる方法等により、ポリオレフィン樹脂に不飽和カルボン酸単位をグラフト共重合する方法が挙げられる。操作が簡便である点から前者の方法が好ましい。
ポリウレタン系樹脂としては、主鎖中にウレタン結合を含有する樹脂であり、例えばポリオール化合物とポリイソシアネート化合物との反応で得られ、水性媒体への分散性の点から陰イオン性基を有しているものが好ましい。ここで陰イオン性基とは、カルボキシル基、スルホン酸基、硫酸基、リン酸基等の水性媒体中で陰イオンとなる官能基のことをいう。
また、変性ポリオレフィン樹脂やポリウレタン樹脂を水系エマルジョン化させる方法としては、特に制限されるものではなく、固/液撹拌装置や乳化機として広く当業者に知られている装置によって作製することができる。
また、P22層をP21層の上に形成する方法は、特に制限されるべきものではなく、公知のコーティング手法を用いることができる。コーティング手法としては、種々の方法を適用することができ、例えば、ロールコーティング法、ディップコーティング法、バーコーティング法、ダイコーティング法およびグラビアロールコーティング法等や、これらを組み合わせた方法を利用することができる。
本発明の積層シートは、耐紫外線性の観点からP1層を入射面としたときの色調変化Δbが10以下であることが好ましい。ここで色調変化Δbは、紫外線処理前の積層シートP1層を入射面として測定したb値をK0、紫外線処理後の積層シートP1層を入射面として測定したb値をKとして算出された値である。好ましくは6以下、さらに好ましくは3以下である。色調変化Δbを10以下とするためには、P1層に対して酸化チタン粒子を3質量%以上添加することが好ましい方法として挙げられ、酸化チタン粒子の添加量に応じて色調変化Δbを低下させることが可能である。
〔特性の測定方法および評価方法〕
(1)積層シート総厚みと、P1層、P2層、P3層の厚み
ミクロトームを用いて、積層シートの表面に対して垂直方向に切削した小片を作成し、その断面を電界放射走査型電子顕微鏡”JSM-6700F”(日本電子(株)製)を用いて3000倍に拡大観察して撮影した。その断面写真より、積層シートの総厚みと、P1層、P2層、P3層それぞれの厚みを計測し、拡大倍率から逆算して厚みを求めた。なお、厚みは、互いに異なる測定視野から任意に選んだ計5箇所の断面写真を使用し、その平均値を用いた。
厚み30μm以上の積層シートを100mm×幅100mmに切り出して、平面に無荷重の状態で横から見て凹となるように置き、シートの四隅浮き上がり高さを測長した。そのときの合計値をカール高さとして、次のように判定した。
カールの4隅高さ合計値が20mm未満の場合:S
カールの4隅高さ合計値が20mm以上50mm未満の場合:A
カールの4隅高さ合計値が50mm以上100mm未満の場合:B
カールの4隅高さ合計値が100mm以上の場合:C
S~Bが良好であり、その中でもSが最も優れている。
積層シートからP1層、P3層のそれぞれを削るか、または剥がしてP1層およびP3層を分離し、それらについて、以下の方法でP1層の無機粒子含有率Wt1、P3層の無機粒子含有率Wt2を求めた。
P1層について、削りだしたものの質量wt1(g)を測定した。次いで、オルトクロロフェノール中に溶解させ、遠心分離により不溶成分のうち、無機粒子を分取した。得られた無機粒子をオルトクロロフェノールにて洗浄、遠心分離した。なお、洗浄作業は、遠心分離後の洗浄液にアセトンを添加しても白濁しなくなるまで繰り返した。得られた無機粒子の質量wt1’(g)を求め、下記(3)式から無機粒子含有率Wt1を測定した。
P1層の無機粒子含有率(質量%)Wt1=(wt1’/wt1)×100・・・(3)
P3層においても溶解させる溶剤をオルト-ジクロロベンゼン(100℃)に変更してP1層の場合と同様の方法で、P3層の無機粒子含有率Wt2を求めた。
JIS K 6854-3(1994年版)に基づいて、積層シートの層間密着強度を測定した。ここで、層間とはP1層とP2層の間およびP2層とP3層の間など界面剥離できる層間をいう。積層シートを15mm×150mmに切り出した後、ポリエステル層とオレフィン層の層間密着強度を測定した。ポリエステル層とオレフィン層が剥離出来ない場合は、試験片の端を酢酸エチルに浸して25℃、60%RHの雰囲気下で24時間静置してから測定を行った。なお、剥離方法は90°剥離、測定数はn=3とし、シートの縦方向、横方向のそれぞれについて測定した後、その平均値を層間密着強度E0として、次の様に判定した。
剥離強度が15N/15mm以上の場合:S
剥離強度が10N/15mm以上15N/15mm未満の場合:A
剥離強度が5N/15mm以上10N/15mm未満の場合:B
剥離強度が5N/15mm未満の場合:C
S~Bが良好であり、その中でもSが最も優れている。
積層シートを15mm×150mmに切り出した後、タバイエスペック(株)製プレッシャークッカーにて、温度120℃、相対湿度100%RHの条件下にて48時間処理を行った。その後、上記(4)項に従って、耐湿熱試験後の層間密着強度E1を測定した。また、上記(4)項で測定した層間密着強度E0と、耐湿熱試験後の層間密着強度E1を用いて、下記(4)式により強度保持率を算出した。
強度保持率(%)=E1/E0×100・・・(4)
得られた強度保持率について、以下のように判定した。
強度保持率が50%以上の場合:S
強度保持率が40%以上50%未満の場合:A
強度保持率が30%以上40%未満の場合:B
強度保持率が30%未満の場合:C
シート破壊により層間密着強度E1の測定が不可:D
S~Bが良好であり、その中でもSが最も優れている。
JIS K 7129のB法(1992年度版)に基づいて、温度40℃、湿度90%RHの条件で、水蒸気透過率を測定した。MOCON社製の水蒸気透過率測定装置PERMATRAN W-TWINを使用して測定した。また、2枚の試験片について各々測定を1回行い、2つの測定値の平均値を水蒸気透過率の値とした。
水蒸気透過率が3g/m2・day未満の場合:S
水蒸気透過率が3g/m2・day以上、5g/m2・day未満の場合:A
水蒸気透過率が5g/m2・day以上、10g/m2・day以下の場合:B
水蒸気透過率が10g/m2・dayを超える場合:C
S~Bが良好であり、その中でもSが最も優れている。
JIS K 6854-2(1994年版)に基づいて、EVAシートとの接着力を測定した。積層シートのオレフィン層面にEVAシートを重ね、さらにその上に厚さ3mmの半強化ガラスを重ねて、市販のガラスラミネーターを用いて真空引き後に135℃加熱条件下、29.4N/cm2荷重で15分プレス処理をして、疑似太陽電池モジュールサンプルを作製した。EVAシートは、サンビック(株)製の500μm厚シートを用いた。接着強度試験の試験片の幅は10mmとし、剥離方法は180°剥離、測定数はn=3として、3つの測定値の平均値を接着強度の値として、次の様に判定した。
接着強度が60N/10mm以上の場合:SS
接着強度が40N/10mm以上60N/10mm未満の場合:S
接着強度が30N/10mm以上40N/10mm未満の場合:A
接着強度が20N/10mm以上30N/10mm未満の場合:B
接着強度が20N/10mm未満の場合:C
SS~Bが良好であり、その中でもSSが最も優れている。
(8)耐湿熱試験後の封止剤(EVA)との接着強度
積層シートのオレフィン層面にEVAシートを重ね、さらにその上に厚さ3mmの半強化ガラスを重ねて、市販のガラスラミネーターを用いて真空引き後に135℃加熱条件下、29.4N/cm2荷重で15分プレス処理をして、疑似太陽電池モジュールサンプルを作製し、タバイエスペック(株)製プレッシャークッカーにて、温度120℃、相対湿度100%RHの条件下にて48時間処理を行った。その後、上記(7)項に従って、耐湿熱試験後のEVAシートとの接着力を測定し、次の様に判定した。
接着強度が60N/10mm以上の場合:SS
接着強度が40N/10mm以上60N/10mm未満の場合:S
接着強度が30N/10mm以上40N/10mm未満の場合:A
接着強度が20N/10mm以上30N/10mm未満の場合:B
接着強度が20N/10mm未満の場合:C
シート破壊により接着強度の測定不可:D
SS~Bが良好であり、その中でもSSが最も優れている。
(9)耐紫外線性
紫外線処理前の積層シートP1層側から測定したb値をK0、紫外線処理後の積層シートP1層側から測定したb値をKとした時に、下記(5)式により求められる値をP1層側の色調変化Δbとして、この値より積層シートの耐紫外線性を評価した。
Δb=K-K0・・・(5)
紫外線処理は、スガ試験機(株)製キセノンウェザーメーターSC750にて、温度65℃、相対湿度50%RH、強度150W/m2(光源:キセノンランプ、波長範囲:290~400nm)の条件下でP1層側に1000時間照射した。また、b値の求め方は次の通りである。
分光式色差計SE-2000型(日本電色工業(株)製)を用い、JIS Z-8722(2000)に準じて反射モードにて、P1層のb値を測定した。サンプル数はn=5とし、試料測定径を30mmφとして、それぞれのb値を測定して、その平均値を算出した。得られたP1層側の色調変化Δbより積層シートの耐紫外線性について以下のように判定を行った。
色調変化Δbが3以下の場合:S
色調変化Δbが3より大きく6以下の場合:A
色調変化Δbが6より大きく10以下の場合:B
色調変化Δbが10より大きい場合:C
S~Bが良好であり、その中でもSが最も優れている。
分光光度計U-3410(日立製作所(株)製)を用いて、400~700nmの範囲の分光反射率を10nm間隔で測定し、その平均値を平均相対反射率とした。サンプル数はn=5とし、それぞれの平均相対反射率を測定して、その平均値を算出した。測定ユニットはφ60mmの積分球(型番130-0632)を使用し、10°傾斜スペーサーを取り付けた。また、標準白色板には酸化アルミニウム(型番210-0740)を使用した。なお、積層シートである場合には、積層シートのポリエステル系樹脂層側から測定する。
平均相対反射率が80%以上の場合:S
平均相対反射率が60%以上80%未満の場合:A
平均相対反射率が30%以上60%未満の場合:B
平均相対反射率が30%未満の場合:C
S~Bが良好であり、その中でもSが最も優れている。
部分放電試験器KPD2050(菊水電子工業(株)製)を用いて、部分放電電圧を求めた。なお試験条件は下記のとおりとする。
・出力シートにおける出力電圧印加パターンは、1段階目が0Vから所定の試験電圧までの単純に電圧を上昇させるパターン、2段階目が所定の試験電圧を維持するパターン、3段階目が所定の試験電圧から0Vまでの単純に電圧を降下させるパターンの3段階からなるパターンのものを選択する。
・周波数は50Hzとする。試験電圧は1kVとする。
・1段階目の時間T1は10sec、2段階目の時間T2は2sec、3段階目の時間T3は10secとする。
・パルスカウントシートにおけるカウント方法は「+」(プラス)、検出レベルは50%とする。
・レンジシートにおける電荷量はレンジ1000pcとする。
・プロテクションシートでは、電圧のチェックボックスにチェックを入れた上で2kVを入力する。また、パルスカウントは100000とする。
・計測モードにおける開始電圧は1.0pc、消滅電圧は1.0pcとする。
なお、測定はフィルム面内において任意の10カ所で測定を実施し、その平均値を、部分放電電圧V0とした。また、測定試料は、23℃、65%Rhの室内で一晩放置したものを用いて測定を実施した。
部分放電電圧が950V以上の場合:S
部分放電電圧が700V以上950V未満の場合:A
部分放電電圧が300V以上700V未満の場合:B
部分放電電圧が300V未満の場合:C
S~Bが良好であり、その中でもSが最も優れている。
ゲル浸透クロマトグラフィーにより求められる値であって、PET-DMT(標準品)を用いて分子量校正曲線を作成し、その分子量校正曲線を基にして得られる値のことである。まず、カラムとしてShodex HFIP 80M (昭和電工(株)製)を2本、検出器としてR-401型示差屈折率器(WATERS社製)を搭載したゲル浸透クロマトグラフ GCP-244(WATERS社製)を使用し、PET-DMT(標準品)を用いて室温(23℃)でGPC測定を実施する。得られた溶出容積(V)及び分子量(M)を用いて下記式(6)の3次の近似式の係数(A1)を計算して校正曲線を作図する。
Log(M)=A0+A1V+A2V2+A2V2+A3V3 ・・・(6)
次に、溶媒としてヘキサフルオロプロパノール(0.005N-トリフルオロ酢酸ソーダ)を用い、ポリエステルを0.06質量%となるように溶解させた溶液を作成し、その溶液を用いてGPC測定を行う。測定条件は、インジェクション量0.300ml、流速は0.5ml/minで実施した。
得られた溶出曲線分子量曲線と分子量校正曲線を重ね合わせ、各流出時間に対応する分子量を求め、下記式(7)により算出した値を、数平均分子量とする。
数平均分子量(Mn)=ΣNiMi/ΣNi ・・・(7)
(ここで、Niはモル分率、Miは分子量較正曲線を介して得られたGPC曲線の各溶出位置の分子量である。)なお、かかる測定に使用されるポリエステル層に、有機微粒子、無機微粒子、金属、金属塩、その他添加剤等で溶媒に不溶な成分を含んでいる場合には、フィルターによる濾過や、遠心分離などにより、不溶成分の除去を行った後に、溶液を再度調製して測定した値である。また、該ポリエステル層に可塑剤、界面活性剤、染料などの添加剤を含んでいる可能性がある場合は、不溶成分を除去した後に、最沈殿法、再結晶法、クロマトグラフィー法、抽出法等により、前記同様にかかる不溶添加剤を除去した後に、再度溶液を調製して測定した値である。また、ポリエステル層が積層構造の場合は、他の層を剥離したり、顕微鏡観察しながら該当フィルムを研磨したりしてポリエステル層のみとしたサンプルを用いて測定を実施した値である。
示差走査熱量測定(以下、DSC)により得られる、昇温過程(昇温速度:20℃/min)で求まる値であり、JIS K-7121(1999)に基づいた方法により、25℃から300℃まで20℃/分の昇温速度で昇温して得られた示差走査熱量測定チャートにおける結晶融解ピーク前の微少吸熱ピーク温度をTmeta、さらに300℃の状態で5分間保持し、次いで25℃以下となるよう急冷し、再度25℃から300℃まで20℃/分の昇温速度で昇温して得られた示差走査熱量測定チャートにおける結晶融解ピークにおけるピークトップの温度をTmとする。
太陽電池モジュールの製造方法として、透明基材/第1の封止材/発電素子/第2の封止材/積層シートの順に重ね、真空ラミネート装置を用いて真空ラミネートすることにより太陽電池モジュールを製造する。ラミネート条件;150℃、真空状態時間5分、プレス時間10分で100個太陽電池モジュールを作製し、太陽電池モジュールの製造工程における加工適性を下記基準で評価した。
合格品の太陽電池モジュールが95個以上の場合:S
合格品の太陽電池モジュールが90~94個の場合:A
合格品の太陽電池モジュールが80~89個の場合:B
合格品の太陽電池モジュールが79個以下の場合:C
S~Bが良好であり、その中でもSが最も優れている。
オルトクロロフェノール100mlに、P1層を溶解させ(溶液濃度C=1.2g/ml)、その溶液の25℃での粘度をオストワルド粘度計を用いて測定した。また、同様に溶媒の粘度を測定した。得られた溶液粘度、溶媒粘度を用いて、下記式(8)により、[η]を算出し、得られた値でもって固有粘度(IV)とした。
ηsp/C=[η]+K[η]2・C ・・・(8)
(ここで、ηsp=(溶液粘度/溶媒粘度)―1、Kはハギンス定数(0.343とする)である。)。
(16)COOH末端基量
P1層のCOOH末端基量について、 Mauliceの方法によって測定した。(文献M.J. Maulice, F. Huizinga, Anal.Chim.Acta,22 363(1960))
1.PET-A原料(実施例1~7、10~35、比較例1~3、5~10)
ジカルボン酸成分としてテレフタル酸100mol%、ジオール成分としてエチレングリコール100mol%を用い、触媒として酢酸マグネシウム、三酸化アンチモン、亜リン酸を用いて重縮合反応を行った。次いで、得られたポリエチレンテレフタレートを160℃で6時間乾燥、結晶化させたのち、220℃、真空度0.3Torr、9時間の固相重合を行い、融点255℃、固有粘度0.80、COOH末端基量10eq./tのポリエチレンテレフタレート(PET-A)原料を得た。
ジカルボン酸成分としてテレフタル酸100mol%、ジオール成分としてエチレングリコール100mol%を用い、触媒として酢酸マグネシウム、三酸化アンチモン、亜リン酸を用いて重縮合反応を行った。次いで、得られたポリエチレンテレフタレートを160℃で6時間乾燥、結晶化させ、融点255℃、固有粘度0.65、COOH末端基量25eq./tのポリエチレンテレフタレート(PET-B)原料を得た。
ジカルボン酸成分としてテレフタル酸100mol%、ジオール成分としてエチレングリコール100mol%を用い、触媒として酢酸マグネシウム、三酸化アンチモン、亜リン酸を用いて重縮合反応を行った。次いで、得られたポリエチレンテレフタレートを160℃で6時間乾燥、結晶化させたのち、220℃、真空度0.3Torr、12時間の固相重合を行い、融点255℃、固有粘度1.18、COOH末端基量15eq./tのポリエチレンテレフタレート(PET-C)原料を得た。
2,6-ナフタレンジカルボン酸ジメチル100質量部とエチレングリコール60質量部の混合物に、酢酸マンガン・4水和物塩0.03質量部を添加し、150℃の温度から240℃の温度に徐々に昇温しながらエステル交換反応を行った。途中、反応温度が170℃に達した時点で三酸化アンチモン0.024質量部を添加した。また、反応温度が220℃に達した時点で3,5-ジカルボキシベンゼンスルホン酸テトラブチルホスホニウム塩0.042質量部(2mmol%に相当)を添加した。その後、引き続いてエステル交換反応を行い、トリメチルリン酸0.023質量部を添加した。次いで、反応生成物を重合装置に移し、290℃の温度まで昇温し、30Paの高減圧下にて重縮合反応を行い、重合装置の撹拌トルクが所定の値(重合装置の仕様によって具体的な値は異なるが、本重合装置にて固有粘度0.65のポリエチレン-2,6-ナフタレートが示す値を所定の値とした)を示した。次いで、得られたポリエチレンテレフタレートを160℃で6時間乾燥、結晶化させたのち、220℃、真空度0.3Torr、9時間の固相重合を行い、融点255℃、固有粘度0.70、COOH末端基量25eq./tのポリエチレンナフタレート(PEN)原料を得た。
東レ社製トレコン1200Mを用いた。融点255℃、固有粘度1.23、COOH末端基量23eq./tであった。
上記1.項によって得られたPET-A原料100質量部と、平均粒子径210nmのルチル型酸化チタン粒子100質量部を、ベントした290℃の押出機内で溶融混練し、酸化チタン原料(PETa-TiO2)を作製した。
上記2.項によって得られたPET-B原料100質量部と、平均粒子径210nmのルチル型酸化チタン粒子100質量部を、ベントした290℃の押出機内で溶融混練し、酸化チタン原料(PETb-TiO2)を作製した。
上記3.項によって得られたPET-C原料100質量部と、平均粒子径210nmのルチル型酸化チタン粒子100質量部を、ベントした290℃の押出機内で溶融混練し、酸化チタン原料(PETc-TiO2)を作製した。
上記4.項によって得られたPEN原料100質量部と、平均粒子径210nmのルチル型酸化チタン粒子100質量部を、ベントした300℃の押出機内で溶融混練し、酸化チタン原料(PEN-TiO2)を作製した。
上記5.項によって得られたPBT原料100質量部と、平均粒子径210nmのルチル型酸化チタン粒子100質量部を、ベントした260℃の押出機内で溶融混練し、酸化チタン原料(PBT-TiO2)を作製した。
1.塗剤A(実施例1~13、19~37、比較例2、5~10)
水を希釈溶剤として、固形分比で無水マレイン酸変性ポリプロピレン(無水マレイン酸変性PP)樹脂水分散体が50質量%、水性ポリウレタン系樹脂塗料が48質量%、エポキシ架橋剤が2質量%、フッ素系界面活性剤、互応化学社製、プラスコートRY-2が0.2質量%の割合となるように配合し、固形分15質量%のエマルジョン溶液を作製した。
2.塗剤B(実施例14)
水を希釈溶剤として、固形分比で水性ポリウレタン系樹脂塗料が96質量%、エポキシ架橋剤が4質量%、フッ素系界面活性剤、互応化学社製、プラスコートRY-2が0.2質量%の割合となるように、固形分15質量%のエマルジョン溶液を作製した。
3.塗剤C(実施例15)
水を希釈溶剤として、固形分比で無水マレイン酸変性ポリプロピレン(無水マレイン酸変性PP)樹脂水分散体が5質量%、水性ポリウレタン系樹脂塗料が93質量%、エポキシ架橋剤が2質量%、フッ素系界面活性剤、互応化学社製、プラスコートRY-2が0.2質量%の割合となるように配合し、固形分15質量%のエマルジョン溶液を作製した。
4.塗剤D(実施例16)
無水マレイン酸変性ポリプロピレン(無水マレイン酸変性PP)樹脂水分散体が50質量%、水性ポリウレタン系樹脂塗料が50質量%、フッ素系界面活性剤、互応化学社製、プラスコートRY-2が0.2質量%の割合となるように配合した事以外は塗剤Cと同様にして、固形分15質量%のエマルジョン溶液を作製した。
5.塗剤E(実施例17)
無水マレイン酸変性ポリプロピレン(無水マレイン酸変性PP)樹脂水分散体が88質量%、水性ポリウレタン系樹脂塗料が10質量%、エポキシ架橋剤が2質量%、フッ素系界面活性剤、互応化学社製、プラスコートRY-2が0.2質量%の割合となるように配合したこと以外は塗剤Cと同様にして、固形分15質量%のエマルジョン溶液を作製した。
6.塗剤F(実施例18)
無水マレイン酸変性ポリプロピレン(無水マレイン酸変性PP)樹脂水分散体が89質量%、水性ポリウレタン系樹脂塗料が9質量%、エポキシ架橋剤が2質量%、フッ素系界面活性剤、互応化学社製、プラスコートRY-2が0.2質量%の割合となるように配合したこと以外は塗剤Cと同様にして、固形分15質量%の溶液を作製した。
1.EPBC(実施例1~19、22~37、比較例3~10;P31層、実施例20~21;P32層、実施例23、実施例35;P33層)
エチレンを3.5質量%、ブテンを4.0質量%の割合で共重合し、融点(以下、Tm)が160℃、230℃でのメルトフロートレート(以下、MFR)が6g/10minのEPBCを用いた。
Tmが165℃、230℃でのMFRが7g/10minのホモPPを用いた。
エチレンを4.2質量%の割合で共重合し、Tmが142℃、230℃でのMFRが6g/10minのEPCを用いた。
Tmが115℃、190℃でのMFRが3g/10minのLLDPEを用いた。
Tmが160℃、230℃でのMFRが6g/10min、密度が0.9kg/m3の非架橋エラストマー樹脂を用いた。
6.ポリオレフィン系エラストマーB(実施例34~35;P31層、実施例35;P33層)
Tmが59℃、190℃でのMFRが5.0dg/min、密度が0.87kg/m3のオレフィン系エラストマー樹脂を用いた。
Tmが120℃、190℃でのMFRが3.5g/10min、密度が0.9g/m3の酸変性オレフィン樹脂を用いた。
PP樹脂100質量部と、平均粒子径210nmのルチル型酸化チタン粒子100質量部を、ベントした300℃の押出機内で溶融混練し、酸化チタン原料(PP-TiO2)を作製した。
EPBC樹脂100質量部と、平均粒子径210nmのルチル型酸化チタン粒子100質量部を、ベントした300℃の押出機内で溶融混練し、酸化チタン原料(EPBC-TiO2)を作製した。
180℃で2時間真空乾燥した『(ポリエステル系樹脂原料)』の項に記載の『PET原料A』と『PETベース酸化チタンマスターA』を表1の濃度となるように調合し290℃の押出機内で溶融混練し、Tダイ口金に導入した。次いで、Tダイ口金よりシート状に溶融押出して表面温度25℃に保たれたドラム上に静電印加法で密着冷却固化させて、未延伸単層フィルムを得た。続いて、該未延伸単層フィルムを80℃の温度に加熱したロール群で予熱した後、85℃の温度の加熱ロールを用いて長手方向(縦方向)に3.3倍に延伸し、25℃の温度のロール群で冷却して一軸延伸フィルムを得た。一軸延伸したフィルムにコロナ処理を施した後、『(接着層用塗剤の調製)』の項に記載の塗剤のうち実施例、比較例の番号に対応した塗剤を#8のメタリングバーにて塗布した。
180℃で2時間真空乾燥した『(ポリエステル系樹脂原料)』の項に記載の『PET原料A』と『PETベース酸化チタンマスターA』を表1の濃度となるように調合し290℃の押出機内で溶融混練し、Tダイ口金に導入した。次いで、Tダイ口金よりシート状に溶融押出して表面温度25℃に保たれたドラム上に静電印加法で密着冷却固化させて、未延伸単層フィルムを得た。続いて、該未延伸単層フィルムを80℃の温度に加熱したロール群で予熱した後、85℃の温度の加熱ロールを用いて長手方向(縦方向)に3.3倍に延伸し、25℃の温度のロール群で冷却して一軸延伸フィルムを得た。得られた一軸延伸フィルムの両端をクリップで把持しながらテンター内の90℃の温度の予熱ゾーンに導き、引き続き連続的に100℃に保たれた加熱ゾーンで長手方向に直角な方向(幅方向)に3.8倍に延伸した。さらに引き続いて、テンター内の熱処理ゾーンで200℃で20秒間の熱処理を施し、さらに210℃で4%幅方向に弛緩処理を行った。次いで、均一に徐冷し、フィルム厚さ150μmの二軸延伸フィルムを得た。P1層の固有粘度IV、COOH末端基量は表1に示す通りであった。
塗工条件:乾燥膜厚3.0μm、乾燥オーブン設定温度120℃
エージング:塗布、巻き取り後、40℃の室内下で2日間エージング
次に、押出機1、押出機2および押出機3を用い、『(オレフィン原料)』の項に記載の各オレフィン原料を用いて表1に示すP31層,P32層,P33層の組成となるようにそれぞれ300℃の押出機内で溶融混練し、P31層/P32層/P33層の順に積層されるようマルチマニホールドにて各層を合流させ、積層比が順に1/4/1となるように口金から吐出された樹脂を表面温度15℃に保たれたドラム上にキャストした直後に、上記で得られた二軸延伸PETフィルムの接着層面と圧着して押し出しラミネ-ト積層し、表1の構成の積層シートを作成した。
180℃で2時間真空乾燥した『(ポリエステル系樹脂原料)』の項に記載の『PEN原料』と『PENベース酸化チタンマスター』を表1の濃度となるように調合し300℃の押出機内で溶融混練し、Tダイ口金に導入した。次いで、Tダイ口金よりシート状に溶融押出して表面温度25℃に保たれたドラム上に静電印加法で密着冷却固化させて、未延伸単層フィルムを得た。続いて、該未延伸単層フィルムを130℃の温度に加熱したロール群で予熱した後、145℃の温度の加熱ロールを用いて長手方向(縦方向)に4.2倍に延伸し、25℃の温度のロール群で冷却して一軸延伸フィルムを得た。一軸延伸したフィルムにコロナ処理を施した後、塗剤Aを#8のメタリングバーにて塗布した。
180℃で2時間真空乾燥した『(ポリエステル系樹脂原料)』の項に記載の『PBT原料』と『PBTベース酸化チタンマスター』を表1の濃度となるように調合し260℃の押出機内で溶融混練し、Tダイ口金に導入した。次いで、Tダイ口金よりシート状に溶融押出して表面温度25℃に保たれたドラム上に静電印加法で密着冷却固化させて、150μmの未延伸単層フィルムを得た。上記で得られたフィルムの片面に、塗剤Aを下記塗工条件でグラビアコーターを用いて塗工し、接着層を設けたこと以外は、実施例1と同様に積層シートを得た。
塗工条件:乾燥膜厚0.4μm、乾燥オーブン設定温度120℃
エージング:塗布、巻き取り後、40℃の室内下で2日間エージング
得られた積層シートについて、特性評価を行った。その結果、表2に示す通り、平面性など各種特性に優れるシートであることがわかった。
(実施例20)
P3層の工程において、押出機1、2を用い、P32層となる『(オレフィン原料)』の項に記載の『EPBC』と『EPBCベース酸化チタンマスター』を表1に示すP32層の組成となるように押出機1へ、P33層となる『(オレフィン原料)』の項に記載の『EPC』と『LLDPE』を押出機2へ表1に示すP33層の組成となるように投入し、それぞれ300℃の押出機内で溶融混練し、積層比が順に4/1となるように口金から吐出したこと以外は、実施例1と同様にして表1の構成の積層シートを作成した。得られた積層シートについて特性評価を行ったところ、表2に示す通り、P3層のオレフィン種を変更したため、層間密着性や充填剤との接着強度がやや劣る特性であった。
(実施例21)
P3層の工程において、押出機1を用い、『(オレフィン原料)』の項に記載の『EPBC』と『EPBCベース酸化チタンマスター』を表1に示すP32層の組成となるように300℃の押出機内で溶融混練し、口金から吐出したこと以外は、実施例1と同様にして表1の構成の積層シートを作成した。得られた積層シートについて特性評価を行ったところ、表2に示す通り、P3層のオレフィン種を変更したため、初期の層間密着性やEVAとの接着強度がやや劣る特性であった。
P3層の工程において、押出機1、2を用い、P31層となる『(オレフィン原料)』の項に記載の『EPBC』を押出機1へ、P33層となる『(オレフィン原料)』の項に記載の『EPC』と『LLDPE』を表1に示すP33層の組成となるように押出機2へ投入し、それぞれ300℃の押出機内で溶融混練し、積層比が順に1/1となるように口金から吐出したこと以外は、実施例1と同様にして表1の構成の積層シートを作成した。得られた積層シートについて特性評価を行ったところ、表2に示す通り、P3層の酸化チタン濃度を変更したため、平均相対反射率がA判定であった。
(実施例36)
P1層の工程において、180℃で2時間真空乾燥した『(ポリエステル系樹脂原料)』の項に記載の『PET原料B』と『PETベース酸化チタンマスターB』を表1の濃度となるように調合したこと以外は、実施例1と同様にして表1の構成の積層シートを作成した。得られた積層シートについて特性評価を行ったところ、表2に示す通り、P1層の固有粘度IV、COOH末端基量が変化したため、耐湿熱試験後の層間密着試験時、ならびに耐湿熱試験後のEVA密着試験時にP1層が破壊し、密着強度の測定が不可能であったが、P1層が破壊されなければ密着強度は良好である。
(実施例37)
P1層の工程において、180℃で2時間真空乾燥した『(ポリエステル系樹脂原料)』の項に記載の『PET原料C』と『PETベース酸化チタンマスターC』を表1の濃度となるように調合したこと以外は、実施例1と同様にして表1の構成の積層シートを作成した。その結果、P1層を形成するPET原料の固有粘度IVが高いため、P1層の製膜工程において押出機の濾圧が上昇し、さらに延伸工程でのフィルム延伸性、平面性が悪くなった。得られた積層シートについて特性評価を行ったところ、P1層の平面性が悪くなったことにより、層間密着性がやや劣る結果であった。
(比較例1)
180℃で2時間真空乾燥した『(ポリエステル系樹脂原料)』の項に記載の『PET原料A』を290℃の押出機内で溶融混練し、Tダイ口金に導入した。次いで、Tダイ口金よりシート状に溶融押出して表面温度25℃に保たれたドラム上に静電印加法で密着冷却固化させて、未延伸単層フィルムを得た。続いて、該未延伸単層フィルムを80℃の温度に加熱したロール群で予熱した後、85℃の温度の加熱ロールを用いて長手方向(縦方向)に3.3倍に延伸し、25℃の温度のロール群で冷却して一軸延伸フィルムを得た。得られた一軸延伸フィルムの両端をクリップで把持しながらテンター内の90℃の温度の予熱ゾーンに導き、引き続き連続的に100℃に保たれた加熱ゾーンで長手方向に直角な方向(幅方向)に3.8倍に延伸した。さらに引き続いて、テンター内の熱処理ゾーンで200℃で20秒間の熱処理を施し、さらに210℃で4%幅方向に弛緩処理を行った。次いで、均一に徐冷し、フィルム厚さ150μmの二軸延伸フィルムを得た。得られた積層シートについて、特性評価を行った。その結果、表2に示す通り、水蒸気透過率などが劣るシートであることがわかった。
180℃で2時間真空乾燥した『(ポリエステル系樹脂原料)』の項に記載の『PET原料A』を290℃の押出機内で溶融混練し、Tダイ口金に導入した。次いで、Tダイ口金よりシート状に溶融押出して表面温度25℃に保たれたドラム上に静電印加法で密着冷却固化させて、未延伸単層フィルムを得た。続いて、該未延伸単層フィルムを80℃の温度に加熱したロール群で予熱した後、85℃の温度の加熱ロールを用いて長手方向(縦方向)に3.3倍に延伸し、25℃の温度のロール群で冷却して一軸延伸フィルムを得た。一軸延伸したフィルムにコロナ処理を施した後、塗剤Aを#8のメタリングバーにて塗布した。
180℃で2時間真空乾燥した『(ポリエステル系樹脂原料)』の項に記載の『PET原料A』を290℃の押出機内で溶融混練し、Tダイ口金に導入した。次いで、Tダイ口金よりシート状に溶融押出して表面温度25℃に保たれたドラム上に静電印加法で密着冷却固化させて、未延伸単層フィルムを得た。続いて、該未延伸単層フィルムを80℃の温度に加熱したロール群で予熱した後、85℃の温度の加熱ロールを用いて長手方向(縦方向)に3.3倍に延伸し、25℃の温度のロール群で冷却して一軸延伸フィルムを得た。得られた一軸延伸フィルムの両端をクリップで把持しながらテンター内の90℃の温度の予熱ゾーンに導き、引き続き連続的に100℃に保たれた加熱ゾーンで長手方向に直角な方向(幅方向)に3.8倍に延伸した。さらに引き続いて、テンター内の熱処理ゾーンで200℃で20秒間の熱処理を施し、さらに210℃で4%幅方向に弛緩処理を行った。次いで、均一に徐冷し、フィルム厚さ150μmの二軸延伸フィルムを得た。
P3層の工程において押出機1を用い、表1に示すP31層の樹脂を300℃の押出機内で溶融し、口金から吐出された樹脂を表面温度15℃に保たれたドラム上にキャストし、表1の構成のシートを作成した。得られたシートについて、特性評価を行った。その結果、表2に示す通り、耐紫外線性などが劣るシートであることがわかった。
2:封止材
3:発電素子
4:透明基板
5:太陽電池バックシートの封止材2側の面
6:太陽電池バックシートの封止材2と反対側の面
Claims (13)
- ポリエステル系樹脂を主たる構成成分とする層(P1層)、接着性樹脂層(P2層)、および、ポリオレフィン系樹脂を主たる構成成分とする層(P3層)を有する積層シートであって、該積層シートの総厚みが30μm以上500μm以下、P2層の厚みが0.1μm以上3μm以下、P1層の厚みをP1、P3層の厚みをP3としてその比P1/P3が0.2以上5以下を満たすことを特徴とする積層シート。
- 前記P2層が変性ポリオレフィン樹脂を含有する請求項1に記載の積層シート。
- 前記P2層がポリウレタン系樹脂を含有し、前記P2層の変性ポリオレフィン樹脂の含有量W2aとポリウレタン系樹脂の含有量W2bの比W2a/W2bが0.1以上9以下である請求項2に記載の積層シート。
- 前記P3層の厚みが75μm以上である請求項1~3のいずれかに記載の積層シート。
- 前記P3層が積層構造を有する請求項1~4のいずれかに記載の積層シート。
- 前記P3層がポリオレフィン系エラストマーを5質量%以上50質量%以下含有する請求項1~5のいずれかに記載の積層シート。
- 前記P3層が変性ポリオレフィン樹脂を含有する請求項1~6のいずれかに記載の積層シート。
- 前記P1層が酸化チタン粒子を1質量%以上30質量%以下含有する、および/または、前記P3層が酸化チタン粒子を0.5質量%以上20質量%以下含有する請求項1~7のいずれかに記載の積層シート。
- 前記P1層のポリエステル系樹脂がポリエチレンテレフタレートであり、該P1層の固有粘度IVが0.65以上0.80以下、かつCOOH末端基量が25eq./t以下である請求項1~8のいずれかに記載の積層シート。
- 請求項1~9のいずれかに記載の積層シートの製造方法であって、厚さ3μm以下のP2層を少なくともP1層の片側に有するシートに、P3層が溶融押出ラミネート法にて設けられる工程を有することを特徴とする積層シートの製造方法。
- P1層用樹脂組成物をシート状に成形した後、該シートに、または、該シートを一軸に延伸した後に、その少なくとも片側表面にP2層用樹脂組成物を含む塗剤を塗設し、少なくとも一軸に延伸する工程を含む請求項10記載の積層シートの製造方法。
- 請求項1~9のいずれかに記載の積層シートを用いた太陽電池バックシート。
- 請求項12に記載の太陽電池バックシートを用いた太陽電池。
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WO2015046017A1 (ja) * | 2013-09-24 | 2015-04-02 | 東レ株式会社 | 太陽電池用多層シート、太陽電池用封止材一体型裏面保護シート、及び、太陽電池モジュール |
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JP2015185687A (ja) * | 2014-03-24 | 2015-10-22 | 富士フイルム株式会社 | 太陽電池用バックシート部材及びその製造方法、太陽電池用バックシート並びに太陽電池モジュール |
JP2015186861A (ja) * | 2014-03-26 | 2015-10-29 | 富士フイルム株式会社 | 太陽電池用バックシート及び製造方法、並びに太陽電池モジュール |
JP2021520625A (ja) * | 2018-03-28 | 2021-08-19 | ディーエスエム アドバンスド ソーラー ビー.ブイ. | ポリブチレンテレフタレート(polybutylene terephtalate)を含むバックシート |
Also Published As
Publication number | Publication date |
---|---|
IN2014CN01700A (ja) | 2015-05-29 |
US20140209170A1 (en) | 2014-07-31 |
TW201313466A (zh) | 2013-04-01 |
KR20140046009A (ko) | 2014-04-17 |
CN103732401A (zh) | 2014-04-16 |
EP2743081A4 (en) | 2015-03-25 |
JP6051868B2 (ja) | 2016-12-27 |
EP2743081A1 (en) | 2014-06-18 |
JPWO2013021860A1 (ja) | 2015-03-05 |
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