WO2015182282A1 - Film en polyester pour feuilles arrière de cellule solaire - Google Patents

Film en polyester pour feuilles arrière de cellule solaire Download PDF

Info

Publication number
WO2015182282A1
WO2015182282A1 PCT/JP2015/061851 JP2015061851W WO2015182282A1 WO 2015182282 A1 WO2015182282 A1 WO 2015182282A1 JP 2015061851 W JP2015061851 W JP 2015061851W WO 2015182282 A1 WO2015182282 A1 WO 2015182282A1
Authority
WO
WIPO (PCT)
Prior art keywords
polyester film
layer
stretching
film
polyester
Prior art date
Application number
PCT/JP2015/061851
Other languages
English (en)
Japanese (ja)
Inventor
仲辻健太郎
長谷川正大
Original Assignee
東レ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 東レ株式会社 filed Critical 東レ株式会社
Priority to KR1020167030816A priority Critical patent/KR20170012216A/ko
Priority to JP2015521176A priority patent/JPWO2015182282A1/ja
Priority to CN201580026449.8A priority patent/CN106463558B/zh
Publication of WO2015182282A1 publication Critical patent/WO2015182282A1/fr

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/16—Dicarboxylic acids and dihydroxy compounds
    • C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
    • C08G63/199—Acids or hydroxy compounds containing cycloaliphatic rings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—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
    • 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
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/0481—Encapsulation of modules characterised by the composition of the encapsulation material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—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
    • 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
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/049—Protective back sheets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

Definitions

  • the present invention relates to a polyester film for a solar battery back sheet, which has little reduction in film thickness even when used outdoors for a long period of time, and has little reduction in wet heat resistance, weather resistance, and electrical insulation.
  • Polyester films are used for magnetic recording media, for electrical insulation, for solar cells, for capacitors, for packaging, and for various industries by utilizing excellent mechanical properties, thermal properties, electrical properties, surface properties, and heat resistance. It is used for various applications such as materials for use.
  • a power generation element is sealed with a transparent sealing material such as ethylene-vinyl acetate copolymer (hereinafter sometimes referred to as EVA), a transparent substrate such as glass, and a solar cell back sheet.
  • EVA ethylene-vinyl acetate copolymer
  • a resin sheet is bonded together.
  • Sunlight is introduced into the solar cell through the transparent substrate.
  • 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 solar cell backsheet is used for the purpose of protecting the power generation element of the solar cell from external influences such as rain.
  • the polyester film is used as a solar battery back sheet or as one member constituting the back sheet because of its excellent characteristics.
  • the polyester film for solar cell backsheets Since solar cells are placed outdoors for a long period of time, the polyester film for solar cell backsheets is required to have little deterioration in mechanical properties (moisture and heat resistance) when placed in a high temperature and high humidity for a long period of time. Further, the solar cell is installed under direct sunlight. Therefore, the polyester film for a solar battery back sheet is required to have little deterioration in mechanical properties (weather resistance) when placed for a long time under ultraviolet irradiation. Moreover, the characteristic (electrical insulation) which electrically insulates a power generation element and external air is also calculated
  • Patent Documents 1 to 4 Various studies have been made so far to solve the above problems.
  • polyester films obtained by the methods of Patent Documents 1 to 4 are excellent in moisture and heat resistance, weather resistance, and electrical insulation, but when used outdoors for a long period of time, film loss occurs, moisture and heat resistance, weather resistance, There was a problem that the electrical insulation was greatly reduced.
  • the problem of the present invention is that even when used outdoors for a long period of time, there is little decrease in the thickness of the film (hereinafter, this characteristic may be referred to as film resistance), and it is used outdoors for a long period of time.
  • Another object of the present invention is to provide a polyester film in which there is little decrease in wet heat resistance, weather resistance, and electrical insulation (hereinafter, this characteristic may be referred to as durability).
  • P1 layer A solar cell having a polyester layer satisfying the following (1) to (3) (referred to as P1 layer) on at least one surface layer and having an elongation retention of 40% or more after a durability test Polyester film for back sheet.
  • the thickness of the P1 layer is 30 ⁇ m or more and 250 ⁇ m or less.
  • the surface roughness (Ra) of the P1 layer is greater than 0.10 ⁇ m and 0.50 ⁇ m or less.
  • the amount of decrease in the thickness of the P1 layer after the durability test is 15 ⁇ m or less.
  • the polyester resin composition constituting the P1 layer contains rutile type titanium oxide, and the content of the rutile type titanium oxide is 14 to 20% by weight based on the whole polyester resin composition constituting the P1 layer.
  • the polyester resin composition constituting the P1 layer contains a polyester resin composition mainly composed of 1,4-cyclohexylenedimethylene terephthalate unit (hereinafter referred to as CHT unit), and the CHT unit.
  • the solar cell bag according to any one of (a) to (d), wherein the content of the polyester resin composition containing as a main component is 14 to 20% by weight based on the entire polyester resin composition constituting the P1 layer Polyester film for sheet.
  • the polyester resin constituting the polyester film has an intrinsic viscosity of 0.6 to 1.0 dl / g and a terminal carboxyl group content of 5 to 20 equivalents / t.
  • the polyester film for solar cell backsheet of description The polyester film for solar cell backsheet of description.
  • (G) The method for producing a polyester film for solar cell backsheet according to any one of (a) to (f), which satisfies the following (4) to (6).
  • the temperature of the cooling drum is between Tg-70 ° C. and Tg-30 ° C. of the polyester resin constituting the P1 layer.
  • the time (residence time) in contact with the cooling drum is 20 seconds to 120 seconds.
  • the stretching in (7) is performed using a stretching roll and a stretching nip roll, and the surface roughness Ra of the stretching roll is 0.5 to 1.5 ⁇ m, and the stretching roll;
  • the nip pressure between the stretching nip rolls is 0.4 to 1.0 MPa.
  • (G) The method for producing a polyester film for a solar cell backsheet according to any one of (a) to (f), which satisfies the following (4) to (10): (4) A step of melt-kneading the polyester resin composition constituting the P1 layer with an extruder and extruding and cooling and solidifying on a cooling drum to obtain an unoriented polyester film. (5) The temperature of the cooling drum is between Tg-70 ° C. and Tg-30 ° C. of the polyester resin constituting the P1 layer. (6) The time (residence time) in contact with the cooling drum is 20 seconds to 120 seconds. (7) A step of stretching the unoriented polyester film obtained in (4) in the longitudinal direction at a stretching temperature of 70 to 120 ° C.
  • the uniaxially oriented polyester film obtained in the step (7) is stretched in the width direction at a stretching temperature of 70 to 150 ° C. and a stretching ratio of 3.0 to 4.0 times to obtain a biaxially oriented polyester film.
  • the step of obtaining. (9) A step of relaxing the biaxially oriented polyester film obtained in the step (8) by 0 to 10% in the width direction while being heat-treated at 205 to 240 ° C.
  • the stretching in (7) is performed using a stretching roll and a stretching nip roll, and the surface roughness Ra of the stretching roll is 0.5 to 1.5 ⁇ m, and the stretching roll; The nip pressure between the stretching nip rolls is 0.4 to 1.0 MPa.
  • Ko A solar battery back sheet using the polyester film for a solar battery back sheet according to any one of (a) to (f).
  • Sa A solar battery using the solar battery back sheet described in (ko).
  • the present invention it is possible to provide a polyester film for a solar battery back sheet that is excellent in film resistance and durability. Since the polyester film for solar cell backsheet of the present invention is excellent in film resistance and durability, the solar cell comprising the solar cell backsheet comprising the polyester film for solar cell backsheet of the present invention has long-term performance. Can be maintained, and the service life can be extended.
  • the polyester film of the present invention has a P1 layer on at least one surface layer. Having a P1 layer on at least one surface layer may be a single-layer polyester film composed of only the P1 layer, and may be a P1 layer / P2 layer, a P1 layer / P2 layer / P1 layer, a P1 layer / P2 layer / P3 layer.
  • a laminated polyester film such as
  • the P1 layer of the present invention needs to have a thickness of 30 ⁇ m or more and 250 ⁇ m or less.
  • the thickness of the P1 layer is less than 30 ⁇ m, even the P1 layer of the present invention, which has excellent film resistance, is used under conditions where it is exposed to wind, rain, dust, sand dust, dead leaves, etc. for a long time under ultraviolet irradiation. As a result, sufficient mechanical properties cannot be maintained.
  • the thickness of the P1 layer is less than 30 ⁇ m, the electric insulation is insufficient, and dielectric breakdown may occur when used under a high voltage, which is not preferable as a polyester film for a solar battery backsheet.
  • the thickness of the P1 layer is greater than 250 ⁇ m, the processability is poor, and it becomes difficult to make the surface of the P1 layer have a surface shape excellent in film resistance and durability.
  • the polyester film of the present invention is used as a polyester film for a solar battery back sheet, the overall thickness of the solar battery cell may become too thick, which may not be preferable.
  • the P1 layer of the present invention needs to have a surface roughness (Ra) of more than 0.10 ⁇ m and 0.50 ⁇ m or less.
  • Ra surface roughness
  • the surface roughness (Ra) of the P1 layer When the surface roughness (Ra) of the P1 layer is in the above range, the water repellent property when the film surface gets wet is improved. Therefore, even after the polyester film is exposed to rain and wind, the time during which water is present on the film surface can be shortened, and degradation due to hydrolysis on the film surface can be suppressed. Moreover, it becomes possible to reflect an ultraviolet-ray on the film surface by making the surface roughness (Ra) of P1 layer into said range. As a result, it is considered that the ultraviolet rays entering the film can be reduced, and the deterioration of the resin constituting the film can be suppressed.
  • the film resistance of the film can be divided into two stages: film resistance at the initial stage and film resistance at the medium to long term. By setting the surface roughness of the P1 layer in the above range, it is possible to significantly improve the initial stage film resistance.
  • the surface roughness (Ra) of the P1 layer is 0.10 ⁇ m or less, since the deterioration of the resin constituting the film due to the reflection of ultraviolet rays cannot be suppressed, the film reduction rate of the film due to wind and rain and dust increases. Moreover, when the surface roughness (Ra) of the P1 layer is larger than 0.50 ⁇ m, the film surface is poorly repelled when wet, so that deterioration on the film surface cannot be suppressed, resulting in film loss. Increases speed.
  • the surface roughness (Ra) of the P1 layer is more preferably 0.20 ⁇ m or more and 0.40 ⁇ m or less.
  • the polyester film having the surface roughness (Ra) of the P1 layer in the above range can be obtained by the production method described later, the type of resin, and the amount added.
  • the film thickness is reduced little by little. Since film reduction proceeds from the surface of the film, the surface roughness of the film changes with time. Therefore, even if the surface roughness (Ra) of the P1 layer is a film in the above range, the surface roughness changes when used outdoors in the middle and long term, so that high film resistance is maintained. It is not possible.
  • the film resistance at the medium to long-term stage can be improved by adding a resin and additives described later to the polyester resin composition constituting the film.
  • the P1 layer of the present invention is required to have a thickness reduction amount of 15 ⁇ m or less after the durability test described below.
  • ⁇ Durability test> (I) Using a xenon lamp (manufactured by Suga Test Instruments, SC750) under the conditions of a temperature of 65 ° C. and a relative humidity of 50% RH, the surface on the P1 layer side of the polyester film is 102 at an irradiance of 180 W / m 2 . Irradiate for (t-1) minutes. (Ii) After (i), while continuing irradiation with a xenon lamp, a water shower at 16 ° C. ⁇ 5 ° C.
  • Durability test is an accelerated test that assumes the usage of solar cells that are used outdoors for a long period of time under conditions of exposure to wind and rain, dust, sand dust, dead leaves, and the like.
  • the polyester film is deteriorated by being irradiated with ultraviolet rays by a xenon lamp or being subjected to high temperature and high humidity conditions. And since the deteriorated polyester film flows out by a water shower, a reduction in film thickness (film reduction) occurs. Even if it is a polyester film excellent in wet heat resistance, weather resistance, and electrical insulation, if this film reduction is large, its performance will deteriorate during long-term use outdoors.
  • the amount of decrease in the thickness of the P1 layer is more preferably 12 ⁇ m or less. Although it is preferable that the amount of decrease in the film thickness is small, it is difficult to make the thickness less than 0.1 ⁇ m, and it is particularly preferable that the thickness is 0.1 ⁇ m or more and 10 ⁇ m or less.
  • the polyester film of the present invention needs to have an elongation retention after the durability test of 40% or more. If the elongation retention after the durability test is less than 40%, it indicates that the film surface is cracked, and hydrolysis is promoted by accumulation of water in the crack generated on the film surface. It has a fatal effect on the subsequent film properties.
  • the elongation retention after the durability test is more preferably 60% or more.
  • the polyester film of the present invention preferably has a partial discharge voltage maintenance ratio of 90% or more after the durability test.
  • a partial discharge voltage maintenance ratio of 90% or more is preferable as an insulating material used in an environment that is exposed to the outdoors for a long period of time because it can maintain a state of high electrical insulation even outdoors for a long period of time. More preferably, it is 95% or more.
  • the partial discharge voltage (namely, partial discharge voltage before a weather resistance test) of the polyester film of this invention is 1000V or more.
  • the P1 layer of the present invention is mainly composed of a polyester resin.
  • the main constituent component of the polyester resin means that the polyester resin is contained in an amount exceeding 50% by mass with respect to the resin constituting the P1 layer.
  • Specific examples of the polyester resin constituting 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 dicarboxylic acid or an ester-forming derivative thereof (hereinafter collectively referred to as “dicarboxylic acid component”) and a diol component, and 2) carboxylic acid or carboxylic acid in one molecule. It can be obtained by a polycondensation of an acid derivative and a compound having 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
  • alicyclic dicarboxylic acids such as adamantane dicarboxylic acid, norbornene dicarboxylic acid, cyclohexane dicarboxylic acid, decalin dicarboxylic acid, terephthalic acid, isophthalic acid, phthalic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 1,8-naphthalenedicarboxylic acid, 4,4′-diphenyldicarboxylic acid, 4,4
  • dicarboxyl obtained by condensing oxyacids such as l-lactide, d-lactide, and hydroxybenzoic acid, and derivatives thereof, or a combination of a plurality of such oxyacids, at least one carboxy terminus of the dicarboxylic acid component described above.
  • oxyacids such as l-lactide, d-lactide, and hydroxybenzoic acid, and derivatives thereof, or a combination of a plurality of such oxyacids, at least one carboxy terminus of the dicarboxylic acid component described above.
  • oxyacids such as l-lactide, d-lactide, and hydroxybenzoic acid, and derivatives thereof, or a combination of a plurality of such oxyacids, at least one carboxy terminus of the dicarboxylic acid component described above.
  • Compounds can also be used.
  • the diol component includes aliphatic diols such as ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,2-butanediol, and 1,3-butanediol. , Cycloaliphatic dimethanol, spiroglycol, isosorbide and other alicyclic diols, bisphenol A, 1,3-benzenedimethanol, 1,4-benzenedimethanol, 9,9'-bis (4-hydroxyphenyl) fluorene, etc. Aromatic diols are typical examples. Moreover, these may be used independently or may be used in multiple types as needed. In addition, a dihydroxy compound formed by condensing a diol with at least one 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-but
  • examples of the compound having a carboxylic acid or a carboxylic acid derivative and a hydroxyl group in one molecule include oxyacids such as l-lactide, d-lactide and hydroxybenzoic acid, and derivatives thereof, oligomers of oxyacids, dicarboxylic acids Examples thereof include those obtained by condensing an oxyacid with one carboxyl group of the acid.
  • the dicarboxylic acid component and the diol component constituting the polyester resin may be copolymerized by selecting one from the above, or may be copolymerized by selecting a plurality of each.
  • the polyester resin constituting the P1 layer may be a single type or a blend of two or more types of polyester resins. From the viewpoint of mechanical strength and processability, it is preferable to use polyethylene terephthalate (PET) as the main constituent.
  • PET polyethylene terephthalate
  • the resin constituting the P1 layer of the present invention has a polyester resin as the main constituent as described above, but has an intrinsic viscosity of 0.60 dl / g or more and 1.00 dl / g or less, and a terminal carboxyl group amount of 20 equivalents / It is preferable that the heat resistance is not more than tons because heat resistance, moldability, and durability are good. Intrinsic viscosity is preferably 0.65 dl / g or more and 0.80 dl / g or less because moisture and heat resistance, film moldability, and durability are further improved.
  • the resin that constitutes the P1 layer is a solar cell bag that is extremely excellent in durability, moist heat resistance, and moldability by having PET as the main constituent and the intrinsic viscosity and the amount of terminal carboxyl groups satisfy the above ranges. It can be set as the polyester film for sheets.
  • the number average molecular weight of the polyester resin constituting the P1 layer is preferably 8000 to 40000, more preferably 9000 to 30000, and still more preferably 10,000 to 20000.
  • the number average molecular weight of the polyester resin constituting the P1 layer is a gel permeation chromatography method by separating the P1 layer from the polyester film for solar battery backsheet of the present invention and dissolving it in hexafluoroisopronol (HEIP).
  • HEIP hexafluoroisopronol
  • PET-5R polyethylene terephthalate
  • dimethyl terephthalate having a known molecular weight as standard samples from values measured by (GPC method) and detected by a differential refractometer.
  • GPC method polyethylene terephthalate
  • the number average molecular weight of the polyester resin constituting the P1 layer is less than 8000, it is not preferable because the long-term durability of the sheet such as moisture and heat resistance may be deteriorated.
  • it exceeds 40,000 even if the polymerization is difficult or the polymerization can be performed, it may be difficult to extrude the resin with an extruder and film formation may be difficult.
  • the P1 layer is preferably uniaxially or biaxially oriented.
  • characteristics such as moist heat resistance and heat resistance can be improved by orientation crystallization.
  • the polyester resin composition constituting the P1 layer of the present invention contains titanium oxide particles, and the content thereof is 14% by mass or more and 20% by mass or less with respect to the entire polyester resin composition constituting the P1 layer. Preferably there is. This makes it possible to obtain the effect of reducing deterioration due to ultraviolet irradiation over a long period of time by utilizing the ultraviolet absorption ability and light reflectivity of the titanium oxide particles. Can be improved.
  • the effect of improving the film resistance at the initial stage is particularly large when the surface roughness of the P1 layer is 0.20 ⁇ m to 0.40 ⁇ m.
  • a method of melt-kneading the polyester resin and the particles using a vent type twin-screw kneading extruder or a tandem type extruder is preferably used.
  • a high-concentration master pellet having a particle content larger than the amount of particles contained in the polyester resin constituting the P1 layer is prepared, mixed with the polyester resin and diluted to obtain a desired particle content P1 layer. It is preferable to produce it from the viewpoint of heat and humidity resistance.
  • the P1 layer of the present invention may include a heat-resistant stabilizer, an oxidation-resistant stabilizer, an ultraviolet absorber, and an ultraviolet-ray stabilizer as long as the effects of the present invention are not impaired.
  • 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 film of the present invention can be further improved.
  • anti-static agents are added to improve electrical insulation, or organic or inorganic fine particles or bubbles are included to express light reflectivity, or a color material to be colored is added to create a design. Can also be given.
  • the polyester resin composition constituting the P1 layer of the present invention contains a polyester resin mainly composed of 1,4-cyclohexylenedimethylene terephthalate unit (hereinafter also referred to as CHT unit), and the content thereof is It is preferable that it is 14 mass% or more and 20 mass% or less with respect to the whole polyester resin composition which comprises P1 layer.
  • CHT unit 1,4-cyclohexylenedimethylene terephthalate unit
  • the effect of improving the film resistance at the initial stage is particularly large when the surface roughness of the P1 layer is 0.20 ⁇ m to 0.40 ⁇ m.
  • the polyester that has deteriorated by ultraviolet rays is contained in the resin constituting the polyester film by containing a resin having a CHT unit, which has a large viscosity characteristic, as a constituent component. It is estimated that the speed of flowing out is reduced.
  • the content of the CHT unit is less than 14% by mass, the above effect may not be sufficiently obtained.
  • it is more than 20% by mass the film forming property may be deteriorated.
  • content of the polyester resin which makes the main component the CHT unit with respect to the whole polyester resin composition which comprises a polyester film shall be the addition amount with respect to the whole polyester resin composition which comprises a polyester film.
  • the polyester film of the present invention is preferably a laminated polyester film composed of at least two layers having a base material layer (P2 layer) in addition to the P1 layer.
  • P2 layer a base material layer
  • P1 layer may be distribute
  • the P2 layer and the P1 layer it is desirable to co-press the P2 layer and the P1 layer to obtain a polyester film for a solar battery backsheet.
  • curling may occur at the time of bonding, or deterioration may proceed from the adhesive used for bonding.
  • the P2 layer is mainly composed of a polyester resin composition as in the P1 layer. If the composition is the same as that of the P1 layer, the film can be formed (coextruded) at the same time as the P1 layer, and the adhesion to the P1 layer can be improved.
  • the polyester resin constituting the P2 layer of the present invention has an intrinsic viscosity of 0.50 dl / g or more and 0.80 dl / g or less, and a terminal carboxyl group amount of 5 eq / ton or more and 40 eq / ton or less, It is preferable because the film forming property and workability can be improved. It is preferable that the intrinsic viscosity is 0.55 dl / g or more and 0.75 dl / g or less and the terminal carboxyl group amount is 10 equivalents / ton or more and 35 equivalents / ton or less because the heat and humidity resistance becomes better.
  • the polyester resin composition constituting the P2 layer has good film forming properties and workability when the content of titanium oxide particles is 14% by mass or less with respect to the entire polyester resin composition constituting the P2 layer. This is preferable. More preferably, it is 1 mass% or more and 14 mass% or less.
  • the polyester resin composition constituting the P2 layer contains 1% by mass or more and 20% by weight or less of a polyester resin having a CHT unit as a main constituent component. It is preferable to use the above-described resin as the polyester resin composition that constitutes the P2 layer, because the adhesion with the P1 layer can be improved during film formation.
  • the thickness of the P2 layer is 30 ⁇ m or more and 250 ⁇ m or less because the film forming property and workability are improved.
  • the polyester film of the present invention preferably has a total film thickness of 50 ⁇ m or more and 1000 ⁇ m or less.
  • the total thickness of the film is 250 ⁇ m or more, the partial discharge voltage becomes high (electrical insulation becomes good), which is preferable. More preferably, it is 300 micrometers or more, More preferably, it is 350 micrometers or more. On the other hand, if it exceeds 500 ⁇ m, the film forming property and workability may be inferior.
  • the polyester film for solar battery backsheet of the present invention is excellent in durability and film resistance. Therefore, the solar cell on which the polyester film for solar cell backsheet of the present invention is mounted can be a solar cell whose output does not decrease even when placed outdoors for a long period of time.
  • the polyester film for solar battery backsheet of the present invention can be obtained by, for example, the production methods described in (i), (b) and (b) below.
  • (Ii) A method for producing a polyester film for a solar battery back sheet that satisfies the following (4) to (6).
  • (4) A step of melt-kneading the polyester resin composition constituting the P1 layer with an extruder and extruding and cooling and solidifying on a cooling drum to obtain an unoriented polyester film.
  • the temperature of the cooling drum is from Tg-70 ° C. to Tg-30 ° C. of the polyester resin constituting the P1 layer.
  • the time (residence time) in contact with the cooling drum is 20 seconds to 120 seconds.
  • (B) A method for producing a polyester film for a solar battery back sheet that satisfies the following (4), (7) to (10).
  • (4) A step of melt-kneading the polyester resin composition constituting the P1 layer with an extruder and extruding and cooling and solidifying on a cooling drum to obtain an unoriented polyester film.
  • (7) A step of stretching the unoriented polyester film obtained in (4) in the longitudinal direction at a stretching temperature of 70 to 120 ° C. and a stretching ratio of 2.0 to 4.0 times to obtain a uniaxially oriented polyester film.
  • Including. The uniaxially oriented polyester film obtained in the step (7) is stretched in the width direction at a stretching temperature of 70 to 150 ° C.
  • the stretching in (7) is performed using a stretching roll and a stretching nip roll, and the surface roughness Ra of the stretching roll is 0.5 to 1.5 ⁇ m, and the stretching roll;
  • the nip pressure between the stretching nip rolls is 0.4 to 1.0 MPa.
  • (Ha) A method for producing a polyester film for a solar battery backsheet that satisfies the following (4) to (10).
  • (4) A step of melt-kneading the polyester resin composition constituting the P1 layer with an extruder and extruding and cooling and solidifying on a cooling drum to obtain an unoriented polyester film.
  • the temperature of the cooling drum is between Tg-70 ° C. and Tg-30 ° C. of the polyester resin constituting the P1 layer.
  • the time (residence time) in contact with the cooling drum is 20 seconds to 120 seconds.
  • the uniaxially oriented polyester film obtained in the step (7) is stretched in the width direction at a stretching temperature of 70 to 150 ° C. and a stretching ratio of 3.0 to 4.0 times to obtain a biaxially oriented polyester film.
  • the step of obtaining. (9) A step of relaxing the biaxially oriented polyester film obtained in the step (8) by 0 to 10% in the width direction while being heat-treated at 205 to 240 ° C.
  • the stretching in (7) is performed using a stretching roll and a stretching nip roll, and the surface roughness Ra of the stretching roll is 0.5 to 1.5 ⁇ m, and the stretching roll;
  • the nip pressure between the stretching nip rolls is 0.4 to 1.0 MPa.
  • the polyester film of the present invention preferably includes a step of obtaining a non-oriented polyester film by melt-kneading the polyester resin composition constituting the P1 layer with an extruder and then extruding and cooling and solidifying on a cooling drum.
  • the polyester film of the present invention is a laminated polyester film containing a P2 layer in addition to the P1 layer, the raw materials of the P1 layer and the P2 layer are heated and melted in two extruders, merged, and cooled from the die. It is preferable to include a process (melt casting method, co-pressing method) of extruding onto a cast drum to obtain an unoriented laminated polyester film.
  • the temperature of the cooling drum is preferably a glass transition temperature (hereinafter referred to as Tg) of the polyester resin constituting the P1 layer of ⁇ 70 ° C. or higher and Tg ⁇ 30 ° C. or lower.
  • Tg glass transition temperature
  • the surface roughness can be easily increased from 0.1 ⁇ m to 0.5 ⁇ m.
  • the temperature of the cooling drum is preferably Tg ⁇ 60 ° C. or higher and Tg ⁇ 35 ° C. or lower, particularly preferably Tg ⁇ 55 ° C. or higher and Tg ⁇ 40 ° C. or lower, of the polyester resin constituting the P1 layer.
  • the time of contact with the cooling drum is preferably 20 seconds or more and 120 seconds or less.
  • the time of contact with the cooling drum is preferably 20 seconds or longer and 60 seconds or shorter, and particularly preferably 25 seconds or longer and 45 seconds or shorter.
  • the polymer When the time is shorter than 20 seconds, the polymer is rapidly cooled, so that thermal crystallization is greatly generated, and variation in thermal crystallization is increased, so that the surface roughness of the film is in the range of 0.1 to 0.5 ⁇ m. It may be difficult to do, or the film may be broken after stretching in the longitudinal direction.
  • the polyester film of the present invention can be obtained by subjecting the unstretched polyester film to a conventionally known stretching and heat treatment.
  • the polyester film of the present invention was prepared by melt-kneading the polyester resin composition constituting the P1 layer with an extruder, and then extruding and cooling and solidifying on a cooling drum to obtain an unoriented polyester film.
  • To (10) are obtained by a production method including a stretching step and a heat treatment step.
  • the uniaxially oriented polyester film obtained in the step (7) is stretched in the width direction at a stretching temperature of 70 to 150 ° C.
  • the stretching in (7) is performed using a stretching roll and a stretching nip roll, and the surface roughness Ra of the stretching roll is 0.5 to 1.5 ⁇ m, and the stretching roll;
  • the nip pressure between the stretching nip rolls is 0.4 to 1.0 MPa.
  • the stretching in the longitudinal direction is performed using a stretching roll and a stretching nip roll, and the heating in the stretching process is preferably performed by a heated stretching roll.
  • the surface roughness Ra of the drawing roll is 0.5 to 1.5 ⁇ m and the nip pressure between the drawing roll and the drawing nip roll is 0.4 to 1.0 MPa, film breakage or the like may occur.
  • the surface roughness of the P1 layer can be easily made larger than 0.10 ⁇ m and 0.50 ⁇ m or less with good suppression and high productivity.
  • productivity is maintained well. As it is, it is preferable because the durability and film resistance of the resulting polyester film can be improved.
  • the film obtained in the step (7) is guided to a tenter while holding both ends of the film with clips, and is perpendicular to the longitudinal direction in an atmosphere heated to a temperature of 70 to 150 ° C.
  • the film is preferably stretched 3 to 4 times in the direction (width direction).
  • the area ratio obtained by multiplying the draw ratios in the longitudinal direction and the width direction is 9 to 15 times, the durability and film resistance of the resulting polyester film can be improved while maintaining good productivity.
  • step (8) When the biaxially oriented polyester film obtained in step (8) is heat treated at 205-240 ° C. and includes a step of relaxing 0-10% in the width direction, the surface shape formed in the P1 layer is maintained as it is. Easy to do.
  • the polyester film of the present invention is excellent in film resistance and durability, it can be preferably used for solar battery backsheets.
  • the polyester film of this invention is a laminated polyester film which consists of P1 layer and P2 layer, it is preferable to use P1 layer in the aspect used as the outermost layer (code
  • the solar cell including the solar cell back sheet using the polyester film of the present invention can maintain its performance over a long period of time and can prolong its useful life.
  • Terminal carboxyl group amount was measured by the following method according to the method of Malice. (Document M. J. Malice, F. Huizinga, Anal. Chim. Acta, 22 363 (1960)). 2 g of a measurement sample (polyester resin (raw material) or polyester film) was dissolved in 50 mL of o-cresol / chloroform (weight ratio 7/3) at a temperature of 80 ° C., and titrated with a 0.05 N KOH / methanol solution to obtain a terminal carboxyl. The base concentration was measured and indicated as equivalent / polyester 1t.
  • the indicator at the time of titration used phenol red, and the place where it changed from yellowish green to light red was set as the end point of titration. If there is insoluble matter such as inorganic particles in the solution in which the measurement sample is dissolved, the solution is filtered to measure the weight of the insoluble matter, and the value obtained by subtracting the weight of the insoluble matter from the measurement sample weight The following correction was made.
  • the surface roughness (Ra) of the polyester film was measured under the following conditions according to JIS-B0601 (1994) using a high-definition fine shape measuring instrument of the stylus method.
  • Measuring device 3D fine shape measuring instrument (model ET-4000A manufactured by Kosaka Laboratory)
  • Analysis equipment 3D surface roughness analysis system (Model TDA-31, manufactured by Kosaka Laboratory)
  • Stylus Tip radius 0.5 ⁇ m R, Diameter 2 ⁇ m, Diamond needle pressure: 100 ⁇ N
  • Measurement direction / calculation method The film longitudinal direction and the film width direction are each measured 10 times. The average value of the 20 measurements is defined as the surface roughness.
  • Titanium oxide content Using an ICP emission analyzer (manufactured by Perkin Elmer: OPTIMA 4300 DV), the amount of titanium element contained in the film is determined by the following method, and the titanium oxide content is obtained from the obtained titanium element amount. The amount was converted.
  • the polyester film is a laminated polyester film
  • the surface of the laminated polyester film is shaved, a measurement sample is taken from each layer, and the titanium oxide contained in each layer The amount was determined.
  • the collected sample is weighed in a platinum crucible, sulfuric acid is added, and carbonization is performed using a hot plate and a burner.
  • ashing is performed by heating at 550 ° C. for 2 hours in an electric furnace.
  • a mixed flux of sodium carbonate and boric acid is added to the resulting incinerated product, and the mixture is heated with a burner for melting treatment. After standing to cool, diluted nitric acid and hydrogen peroxide solution are added and dissolved. The sample solution is introduced into an ICP emission analyzer, and the titanium element is quantified.
  • the wet heat resistance was determined as follows.
  • A When the breaking elongation after the wet heat test is 20% or more and less than 40% of the breaking elongation before the wet heat test: B
  • C When the breaking elongation after the wet heat test is 10% or more and less than 20% of the breaking elongation before the wet heat test: C
  • D The wet heat resistance is good in A to C, and A is the best among them.
  • Partial Discharge Voltage Based on the following measurement method, partial discharge was measured with the P1 layer facing up to evaluate electrical insulation. Conformity standard: IEC60664 / A2: 2002 4.1.2.4 Partial discharge tester: KPD2050, manufactured by Kikusui Electronics Corporation Maximum applied voltage: 1.6 kV Maximum applied voltage time: 5 seconds Start voltage Charge threshold: 1.0 pC Vanishing voltage charge threshold: 1.0 pC Test time: 22.0 sec Measurement pattern: trapezoid (8) Characteristics after durability test Durability test is performed under the following conditions in accordance with JISK 7350-2 (2008). Thereafter, each characteristic was measured.
  • the thickness ( ⁇ m) of the P1 layer after the durability test was determined as the amount of decrease in the thickness ( ⁇ m) of the P1 layer after the durability test.
  • Glass transition temperature (Tg) of the polyester resin constituting the P1 layer In accordance with JIS K7121 (1999), the differential scanning calorimeter “Robot DSC-RDC220” manufactured by Seiko Denshi Kogyo Co., Ltd. and the disk session “SSC / 5200” for data analysis were used as follows. Perform the measurement.
  • the resin constituting the P1 layer is shaved from the polyester film using a microtome and used as a measurement sample.
  • 5 mg of the obtained measurement sample was weighed in a sample pan, heated from 25 ° C. to 300 ° C. at a heating rate of 20 ° C./min (1stRUN), held in that state for 5 minutes, and then rapidly cooled to 25 ° C. or lower. To do.
  • the temperature was increased again from 25 ° C. to 300 ° C. at a rate of temperature increase of 20 ° C./minute, and a 2ndRUN differential scanning calorimetry chart (the vertical axis represents thermal energy and the horizontal axis represents temperature) Get.
  • a straight line that is equidistant from the extended straight line of each base line in the vertical axis direction and a curve of the step change portion of the glass transition are The glass transition temperature (Tg) (° C.) is determined from the intersecting point. When two or more stepwise changes in glass transition are observed, the glass transition temperature is obtained for each, and the average of these temperatures is taken as the glass transition temperature (Tg) (° C.) of the sample.
  • (10) Film-forming property The film-forming property was determined as follows according to the frequency of film breakage during film formation. Film breaks once / day or more: A Film breaks once / 12 hours or more and less than 1 day: B Film breaks once / 5 hours or more and less than 12 hours: C Film tear once less than 5 hours: D As for the film forming property, A is good and becomes worse in the order of BCD.
  • An ethylene vinyl acetate copolymer resin sheet, a solar cell, and a light-transmitting glass plate are laminated on the side of the solar cell backsheet laminated with the gas barrier film, and are integrated by heating and compressing in the lamination process.
  • a solar cell module is taken out and supplied to the panel loading step of the solar cell panel line.
  • the primer coating step the primer is coated on the adhesive surface with the aluminum frame. Subsequently, the primer is left for about 1 minute as the drying time of the primer in the drying process, and then is carried out from the carry-out process to the frame line side. On the other hand, on the frame line side, an assembled aluminum frame will be introduced.
  • the aluminum frame has a projecting piece for supporting the light receiving surface of the solar cell module on which the solar cells are arranged and the surface side to be installed on the back, and can be provided over the entire periphery of the end of the solar cell module, And it has the structure which made the light-receiving surface side of the solar cell module the open state.
  • the solar cell module coated with the primer is transported, and the aluminum frame and the solar cell module coated with the primer in the panel bonding step are placed (solar cell panel bonding step).
  • a molding is attached as necessary to produce a solar cell panel.
  • the back side of the panel is constituted by a solar cell back sheet, and the P1 layer is located on the outermost layer of the solar cell back sheet.
  • PET raw material A A polycondensation reaction was performed using 100 parts by mass of terephthalic acid as the dicarboxylic acid component, 100 parts by mass 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, and then subjected to solid phase polymerization at 220 ° C. and a vacuum degree of 0.3 Torr for 9 hours to have a melting point of 255 ° C. and an intrinsic viscosity of 0.80 dl / g. A PET raw material A having a terminal carboxyl group amount of 10 equivalents / ton and a Tg of 80 ° C. was obtained.
  • PET raw material B> A polycondensation reaction was performed using 100 parts by mass of terephthalic acid as the dicarboxylic acid component, 100 parts by mass of ethylene glycol as the diol component, and magnesium acetate, antimony trioxide, and phosphorous acid as the catalyst. Subsequently, the obtained polyethylene terephthalate was dried and crystallized at 160 ° C. for 6 hours to obtain a PET raw material B having a melting point of 255 ° C., an intrinsic viscosity of 0.65 dl / g, a terminal carboxyl group amount of 25 equivalents / ton, and a Tg of 80 ° C.
  • PET raw material C PET-A base titanium oxide / CHT master
  • PET raw material A PET-A base titanium oxide / CHT master
  • rutile-type titanium oxide particles having an average particle diameter of 210 nm, and 1,4-cyclohexylenedimethylene terephthalate were mixed at a ratio of 5% by weight, 50% by weight, and 45% by weight, respectively.
  • the mixture was melt-kneaded in a vented 290 ° C. extruder to prepare a PET-A base titanium oxide master (PET raw material C).
  • PET raw material C PET raw material C using anatase type titanium oxide instead of rutile type titanium oxide was used.
  • PET-A base titanium oxide master A PET-A base titanium oxide master (PET raw material D) was melt-kneaded in an extruder at 290 ° C. in which 100 parts by weight of the PET raw material A obtained above and 100 parts by weight of rutile titanium oxide particles having an average particle diameter of 210 nm were vented. was made.
  • PET-A base CHT master A PET-A base CHT master (PET raw material E) was prepared by melt-kneading in a 290 ° C. extruder vented with 100 parts by weight of the PET raw material A obtained above and 100 parts by weight of 1,4-cyclohexylenedimethylene terephthalate. did.
  • PET raw materials A to E vacuum-dried at 180 ° C. for 2 hours are in the proportions shown in the table (the values in the table are the proportions of each raw material relative to the whole raw material when the weight of the whole raw material is 100% by weight)
  • the mixture was melt kneaded in an extruder at 280 ° C. and introduced into a T die die.
  • Example 1 was discharged in a single layer, and otherwise, the raw materials were separately melt-kneaded by two extruders, introduced into the T die die from the two extruders via feed blocks, and P1 / A laminated sheet of P2 is obtained. At this time, the screw rotational speeds of the two extruders were adjusted so that the stacking ratio of P1 / P2 was 4/1.
  • the sheet 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 cooling drum maintained at a surface temperature of 18 ° C. to obtain an unstretched polyester film.
  • the rotation speed of the cooling drum is adjusted so that the time of contact with the cooling drum (residence time) is 30 seconds.
  • the both ends of the obtained uniaxially stretched polyester film are guided to a preheating zone at a temperature of 80 ° C. in a tenter while holding both ends with a clip, and then in a heating zone maintained continuously at 90 ° C. in a direction perpendicular to the longitudinal direction (width direction) ) Was stretched 3.5 times. Subsequently, heat treatment was performed at 215 ° C. for 20 seconds in the heat treatment zone in the tenter, and further, relaxation treatment was performed in the 7% width direction at 215 ° C. Then, it was gradually cooled gradually to obtain a polyester film having a total thickness of 250 ⁇ m.
  • Example 15 to 18 A polyester film was obtained in the same manner as in Example 2 except that the discharge speed and the drum speed were changed and the residence time in the drum was changed to 15, 20, 120.125 seconds, respectively. As a result of evaluating the characteristics of the obtained polyester film, it was as described in the table.
  • Example 19 A polyester film was obtained in the same manner as in Example 2 except that the temperature of the drum was changed to 10 ° C. As a result of evaluating the characteristics of the obtained polyester film, it was as described in the table.
  • Example 20 A polyester film was obtained in the same manner as in Example 2 except that the surface roughness of the drawing roll during uniaxial drawing and the drawing nip pressure were changed as described in the table. As a result of evaluating the characteristics of the obtained polyester film, it was as described in the table.
  • Example 23 A polyester film was obtained in the same manner as in Example 2 except that the heat treatment temperature was changed to 240 ° C. As a result of evaluating the characteristics of the obtained polyester film, it was as described in the table.
  • Example 24 A polyester film was obtained in the same manner as in Example 2 except that the relaxation rate after biaxial stretching was changed to 3% and 10%. As a result of evaluating the characteristics of the obtained polyester film, it was as described in the table.
  • Example 26 A polyester film was obtained in the same manner as in Example 2 except that the heat treatment temperature after biaxial stretching was 200 ° C. and the relaxation rate was changed to 15%. As a result of evaluating the characteristics of the obtained polyester film, it was as described in the table.
  • Example 27 A polyester film was obtained in the same manner as in Example 2 except that the thickness of the film was changed as described in the table. As a result of evaluating the characteristics of the obtained polyester film, it was as described in the table.
  • Comparative Examples 1 to 6, 9, 10 A polyester film was obtained in the same manner as in Example 2 except that the drum temperature, residence time, roll surface roughness during longitudinal stretching, and stretching nip pressure were set as shown in the table. As a result of evaluating the characteristics of the obtained polyester film, it was as described in the table. In any of Comparative Examples 1 to 6, 9, and 10, the thickness reduction amount of the film in the durability test was large, and the characteristics were greatly deteriorated by the durability test.
  • Example 7 A polyester film was obtained in the same manner as in Example 2 except that the titanium oxide was not contained in the polyester film. As a result of evaluating the characteristics of the obtained polyester film, it was as described in the table. If titanium oxide was not added, the elongation retention after the durability test was greatly inferior.
  • Example 8 A polyester film was obtained in the same manner as in Example 2 except that the thickness of the film was changed as described in the table. As a result of evaluating the characteristics of the obtained polyester film, it was as described in the table.
  • the polyester film of the present invention is excellent in film resistance and durability, it can be suitably used as a polyester film for a solar battery backsheet.
  • the solar cell provided with the solar cell backsheet comprising the polyester film for solar cell backsheet of the present invention can maintain its performance over a long period of time, and can extend the service life.
  • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Materials Engineering (AREA)
  • Photovoltaic Devices (AREA)
  • Laminated Bodies (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un film en polyester pour feuilles arrière de cellule solaire, qui comprend une couche de polyester (ci-après appelée « couche P1 ») qui satisfait aux exigences (1)-(3) décrites ci-dessous au moins sous la forme d'une couche de surface. (1) La couche P1 possède une épaisseur de 30 μm à 250 μm (inclus). (2) La couche P1 possède une rugosité de surface (Ra) supérieure à 0,10 μm, mais inférieure ou égale à 0,50 µm. (3) La réduction de l'épaisseur de la couche P1 après un essai d'endurance est inférieure ou égale à 15 µm, et le maintien de l'allongement après un essai d'endurance est égal ou supérieur à 40 %. L'invention réalise un film en polyester qui présente une faible réduction de l'épaisseur du film et qui supprime la diminution de la résistance à la chaleur humide, de la résistance aux intempéries et de l'isolation électrique, même s'il est utilisé en extérieur pendant une longue période.
PCT/JP2015/061851 2014-05-28 2015-04-17 Film en polyester pour feuilles arrière de cellule solaire WO2015182282A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1020167030816A KR20170012216A (ko) 2014-05-28 2015-04-17 태양 전지 백시트용 폴리에스테르 필름
JP2015521176A JPWO2015182282A1 (ja) 2014-05-28 2015-04-17 太陽電池バックシート用ポリエステルフィルム
CN201580026449.8A CN106463558B (zh) 2014-05-28 2015-04-17 太阳能电池背板用聚酯膜

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014109871 2014-05-28
JP2014-109871 2014-05-28

Publications (1)

Publication Number Publication Date
WO2015182282A1 true WO2015182282A1 (fr) 2015-12-03

Family

ID=54698623

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/061851 WO2015182282A1 (fr) 2014-05-28 2015-04-17 Film en polyester pour feuilles arrière de cellule solaire

Country Status (5)

Country Link
JP (1) JPWO2015182282A1 (fr)
KR (1) KR20170012216A (fr)
CN (1) CN106463558B (fr)
TW (1) TW201544321A (fr)
WO (1) WO2015182282A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017157831A (ja) * 2016-02-29 2017-09-07 東レ株式会社 太陽電池裏面保護用シート
KR20180006146A (ko) * 2016-07-08 2018-01-17 코오롱인더스트리 주식회사 백색필름 및 이의 제조방법
KR20180033732A (ko) * 2016-09-26 2018-04-04 코오롱인더스트리 주식회사 태양광 모듈 백시트 및 이의 제조방법

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012018971A (ja) * 2010-07-06 2012-01-26 Teijin Dupont Films Japan Ltd 太陽電池裏面保護膜用ポリエステルフィルム
WO2013051403A1 (fr) * 2011-10-05 2013-04-11 東レフィルム加工株式会社 Feuille de protection arrière destinée à un module de cellule solaire et module de cellule solaire utilisant celle-ci
WO2013153978A1 (fr) * 2012-04-13 2013-10-17 富士フイルム株式会社 Film polyester, feuille arrière pour module de cellules solaires, et module de cellules solaires

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5471451B2 (ja) 2010-01-05 2014-04-16 東洋紡株式会社 太陽電池用易接着性白色ポリエステルフィルム
JP5835667B2 (ja) 2010-07-14 2015-12-24 東洋紡株式会社 太陽電池裏面封止用ポリエステルフィルムの製造方法
JP5613093B2 (ja) 2011-03-28 2014-10-22 富士フイルム株式会社 フィルム、太陽電池用バックシートおよびフィルムの製造方法
JP5352703B2 (ja) 2011-08-03 2013-11-27 東洋インキＳｃホールディングス株式会社 太陽電池裏面保護シートならびに太陽電池モジュール

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012018971A (ja) * 2010-07-06 2012-01-26 Teijin Dupont Films Japan Ltd 太陽電池裏面保護膜用ポリエステルフィルム
WO2013051403A1 (fr) * 2011-10-05 2013-04-11 東レフィルム加工株式会社 Feuille de protection arrière destinée à un module de cellule solaire et module de cellule solaire utilisant celle-ci
WO2013153978A1 (fr) * 2012-04-13 2013-10-17 富士フイルム株式会社 Film polyester, feuille arrière pour module de cellules solaires, et module de cellules solaires

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017157831A (ja) * 2016-02-29 2017-09-07 東レ株式会社 太陽電池裏面保護用シート
KR20180006146A (ko) * 2016-07-08 2018-01-17 코오롱인더스트리 주식회사 백색필름 및 이의 제조방법
KR102584924B1 (ko) 2016-07-08 2023-10-04 코오롱인더스트리 주식회사 백색필름 및 이의 제조방법
KR20180033732A (ko) * 2016-09-26 2018-04-04 코오롱인더스트리 주식회사 태양광 모듈 백시트 및 이의 제조방법
KR102544688B1 (ko) 2016-09-26 2023-06-15 코오롱인더스트리 주식회사 태양광 모듈 백시트 및 이의 제조방법

Also Published As

Publication number Publication date
CN106463558A (zh) 2017-02-22
JPWO2015182282A1 (ja) 2017-04-20
KR20170012216A (ko) 2017-02-02
CN106463558B (zh) 2019-07-12
TW201544321A (zh) 2015-12-01

Similar Documents

Publication Publication Date Title
JP5145479B2 (ja) 太陽電池裏面保護膜用積層ポリエステルフィルム
TWI438089B (zh) 聚酯膜及使用它之太陽能電池背板、太陽能電池、以及它們的製造方法
KR101727766B1 (ko) 이축 배향 폴리에스테르 필름
JP6743698B2 (ja) 太陽電池バックシート用フィルムおよびそれを用いてなる太陽電池バックシート並びに太陽電池
WO2015182282A1 (fr) Film en polyester pour feuilles arrière de cellule solaire
WO2016052133A1 (fr) Produit en couches
JP2018125525A (ja) 太陽電池バックシート用ポリエステルフィルム及び太陽電池バックシート用ポリエステルフィルムを巻き取ってなる太陽電池バックシート用ポリエステルフィルムロールの製造方法
JP2015216213A (ja) 太陽電池裏面保護膜用ポリエステルフィルムおよびそれからなる太陽電池裏面保護膜
WO2018034117A1 (fr) Stratifié, feuille de protection de surface arrière de cellule solaire et module de cellule solaire
JP2017066391A (ja) ポリエステルフィルムおよびそれを用いた電気絶縁シート、風力発電機、粘着テープ
JP2018086750A (ja) 太陽電池バックシート用積層体、太陽電池モジュール
JP6878952B2 (ja) 太陽電池裏面保護用シート
JP2011192790A (ja) 太陽電池用ポリエステルフィルムおよびその製造方法
JP5614298B2 (ja) 太陽電池バックシート用積層ポリエステルフィルム
JP2017157730A (ja) 太陽電池バックシート用ポリエステルフィルム
JP2011097013A (ja) 太陽電池裏面保護膜用ポリエステルフィルム
JP2015188015A (ja) 太陽電池裏面保護用積層ポリエステルフィルム、太陽電池裏面保護シート、及び太陽電池モジュール
JP5662202B2 (ja) 太陽電池裏面保護用白色ポリエステルフィルム
JP2017212438A (ja) 太陽電池モジュール用バックシート及び太陽電池モジュール
WO2015098520A1 (fr) Feuille pour protection de côté arrière de cellule solaire
JP2015070021A (ja) 太陽電池バックシート用ポリエステルフィルムおよびその製造方法
JP2014192180A (ja) 太陽電池バックシート用ポリエステルフィルム
JP2015134872A (ja) 太陽電池バックシート用ポリエステルフィルムおよびその製造方法
JP5455692B2 (ja) 太陽電池裏面保護シート用白色ポリエステルフィルム
JP2018083873A (ja) ポリエステルフィルムおよびそれを用いてなる太陽電池バックシート、太陽電池

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref document number: 2015521176

Country of ref document: JP

Kind code of ref document: A

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15799130

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 20167030816

Country of ref document: KR

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15799130

Country of ref document: EP

Kind code of ref document: A1