WO2015064312A1 - Miroir à film et dispositif de réflexion de la lumière l'utilisant et servant pour une réflexion de la chaleur solaire - Google Patents

Miroir à film et dispositif de réflexion de la lumière l'utilisant et servant pour une réflexion de la chaleur solaire Download PDF

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WO2015064312A1
WO2015064312A1 PCT/JP2014/076720 JP2014076720W WO2015064312A1 WO 2015064312 A1 WO2015064312 A1 WO 2015064312A1 JP 2014076720 W JP2014076720 W JP 2014076720W WO 2015064312 A1 WO2015064312 A1 WO 2015064312A1
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layer
resin
film
film mirror
protective layer
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PCT/JP2014/076720
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English (en)
Japanese (ja)
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光範 後藤
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コニカミノルタ株式会社
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S23/82—Arrangements for concentrating solar-rays for solar heat collectors with reflectors characterised by the material or the construction of the reflector
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/0808—Mirrors having a single reflecting layer
    • 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
    • Y02E10/40—Solar thermal energy, e.g. solar towers

Definitions

  • the present invention relates to a film mirror and a light reflecting device for solar heat reflection using the film mirror. More specifically, the present invention relates to a film mirror capable of realizing a more uniform reflectance of a light reflecting surface and a solar heat reflecting light reflecting device using the film mirror.
  • Power generation technology that uses natural energy such as sunlight, wind power, and geothermal heat is being developed as an alternative energy to fossil fuels.
  • power generation using sunlight is particularly focused because of its abundance of stability and energy. Has been.
  • a condensing device that reflects sunlight by a reflector (mirror) and condenses it in one place is used. Since the reflector is exposed to ultraviolet rays, heat, wind and rain, and sandstorms caused by sunlight, a glass light reflector has been conventionally used from the viewpoint of durability. However, the light reflector made of glass has a problem that it is damaged during transportation, and because it is heavy, a high-strength gantry is required to install it, which increases the construction cost of the plant.
  • Patent Document 1 In order to deal with the above problem, an attempt has been made to replace a glass mirror with a resin reflecting mirror as described in, for example, US Pat. No. 4,307,150.
  • the resin reflection mirror described in Patent Document 1 has a pressure-sensitive adhesive layer on the first surface of the polyester film, a mirror surface made of an aluminum vapor deposition film on the second surface, and is weather resistant. In order to improve the property, a coating made of three kinds of specific monomers is provided on the aluminum layer.
  • Patent Document 1 describes that a resin reflection mirror having such a configuration can be attached to a substrate and used in a reflection device.
  • an object of the present invention is to provide a film mirror that solves the problem of a decrease in reflectance when a film mirror is used, and that can maintain a high reflectance, and a light reflecting device using the film mirror.
  • the present inventor has found that the above object of the present invention is achieved by the following configuration. That is, according to the present invention, From the light incident side A translucent resin layer; A resin substrate; A light reflecting layer; A protective layer containing particles and having a thickness of 20 to 75 ⁇ m; An adhesive layer in contact with the protective layer; Are provided in order.
  • FIG. 1 is a diagram schematically showing a cross section of a film mirror according to an embodiment of the present invention.
  • the film mirror 10 is laminated
  • the protective layer 15 particles 17 are mixed in the resin matrix, and the surface in contact with the adhesive layer is uneven.
  • the present invention is characterized in that a protective layer having a thickness of 20 to 75 ⁇ m including the particles 17 is provided between the adhesive layer and the light reflecting layer.
  • the adhesiveness of an adhesion layer and a protective layer can be improved by mixing particle
  • FIG. 2 is a diagram schematically showing a cross section of a film mirror according to a more preferred embodiment of the present invention.
  • the film mirror 20 has particles in the hard coat layer 28, the translucent resin layer 21, the resin base material 22, the anchor layer 30, the light reflection layer 23, the corrosion prevention layer 24, and the resin matrix from the light incident side. 27, a protective layer 25 having a thickness of 20 to 75 ⁇ m and an adhesive layer 26 are laminated in this order.
  • the hard coat layer 28 is less susceptible to external damage and air, and these contribute to the durability of the film mirror.
  • the anchor layer contributes to the adhesion between the resin base material 22 and the light reflecting layer 23.
  • the total thickness of the film mirror according to the present invention is preferably 80 to 300 ⁇ m, more preferably 80 to 200 ⁇ m, and still more preferably 80 to 170 ⁇ m from the viewpoints of prevention of bending, regular reflectance, handling properties, and the like.
  • the center line average roughness (Ra) of the outermost surface layer on the light incident side of the film mirror is 3 nm or more and 20 nm or less from the viewpoint of preventing scattering of reflected light and increasing the light collection efficiency.
  • the translucent resin layer is a layer made of a resin material having optical transparency. This is because sunlight is reflected by the silver reflection layer, and the translucent resin layer positioned thereon needs to be a component through which sunlight passes. Furthermore, since a hard coat layer may be provided on the translucent resin layer, it also has a role of improving adhesion. Moreover, in order to prevent deterioration of the resin base material used as a foundation
  • polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyethylene, polypropylene, cellophane, and cellulose diacetate, cellulose triacetate (TAC), cellulose acetate butyrate, cellulose acetate propionate (CAP), cellulose Cellulose esters such as acetate phthalate and cellulose nitrate or their derivatives, polyvinylidene chloride, polyvinyl alcohol, polyethylene vinyl alcohol, syndiotactic polystyrene, polycarbonate, norbornene resin, polymethylpentene, polyether ketone, polyimide, polyether sulfone (PES), polysulfones, polyether ketone imide, polyamide, fluorine Fat, nylon, polymethyl methacrylate, acrylic
  • the thickness of the translucent resin layer is preferably 10 to 150 ⁇ m. More preferably, it is 15 to 100 ⁇ m, and still more preferably 20 to 80 ⁇ m.
  • the film thickness is 10 ⁇ m or more, it is possible to sufficiently add materials to be added when providing functions such as protection of the reflection layer, prevention of corrosion, and UV protection, and sufficient adhesion with the adjacent layer is provided. From the viewpoint of bringing about. Setting the thickness to 150 ⁇ m or less is preferable from the viewpoint of maintaining the thickness of the entire film mirror moderately and reducing troubles during the winding of manufacturing.
  • an acrylic resin can be suitably used as a material for forming the translucent resin layer.
  • the translucent resin layer made from an acrylic resin has a methacrylic resin as a main component.
  • the methacrylic resin is a polymer mainly composed of a methacrylic acid ester, and may be a homopolymer of a methacrylic acid ester.
  • the methacrylic acid ester is 50% by mass or more and the other monomer is 50% by mass or less.
  • a copolymer may also be used.
  • the methacrylic acid ester an alkyl ester of methacrylic acid is usually used.
  • a particularly preferred methacrylic resin is polymethyl methacrylate resin (PMMA).
  • the preferred monomer composition of the methacrylic resin is 50 to 100% by weight of methacrylic acid ester, 0 to 50% by weight of acrylic acid ester, and 0 to 49% by weight of other monomers based on the total monomers. More preferably, methacrylic acid ester is 50 to 99.9% by mass, acrylic acid ester is 0 to 50% by mass, and other monomers are 0 to 49% by mass.
  • a particularly preferred combination for the present invention is 75 to 98% by weight of methacrylic acid ester, 0 to 10% by weight of acrylic acid ester, and 1 to 20% by weight of other monomers.
  • alkyl methacrylate examples include methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, and the like.
  • the alkyl group usually has 1 to 8 carbon atoms, preferably 1 to 4 carbon atoms. Of these, methyl methacrylate is preferably used.
  • acrylic rubber SRB215, manufactured by Asahi Kasei Chemicals
  • Delpet registered trademark
  • acrylic resin manufactured by Asahi Kasei Chemicals and the like may be used.
  • alkyl acrylates include methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, and the like.
  • the alkyl group usually has 1 to 8 carbon atoms, preferably 1 to 4 carbon atoms. is there.
  • the monomer other than alkyl methacrylate and alkyl acrylate may be a monofunctional monomer, that is, a compound having one polymerizable functional group in the molecule, or a polyfunctional monomer, It may be a compound having at least two polymerizable functional groups in the molecule.
  • the monofunctional monomer include aromatic alkenyl compounds such as styrene, ⁇ -methylstyrene and vinyl toluene, and alkenyl cyan compounds such as acrylonitrile and methacrylonitrile.
  • polyfunctional monomers examples include polyunsaturated carboxylic acid esters of polyhydric alcohols such as ethylene glycol dimethacrylate, butanediol dimethacrylate, trimethylolpropane triacrylate, allyl acrylate, allyl methacrylate, and cinnamon.
  • Alkenyl esters of unsaturated carboxylic acids such as allyl acid
  • polyalkenyl esters of polybasic acids such as diallyl phthalate, diallyl maleate and triallyl cyanurate
  • diisocyanates such as 1,6-hexamethylene diisocyanate
  • divinylbenzene examples include aromatic polyalkenyl compounds.
  • alkyl methacrylate alkyl acrylate, and monomers other than these, respectively, you may use those 2 or more types as needed.
  • diisocyanates preferred are diisocyanates, and more preferred is 1,6-hexamethylene diisocyanate.
  • the glass transition temperature of the methacrylic resin is preferably 40 ° C. or higher, more preferably 60 ° C. or higher, from the viewpoint of heat resistance of the film. This glass transition temperature can be appropriately set by adjusting the type of monomer and the ratio thereof.
  • the methacrylic resin can be prepared by polymerizing the monomer component by a method such as suspension polymerization, emulsion polymerization or bulk polymerization. At that time, in order to obtain a suitable glass transition temperature or to obtain a viscosity showing a formability to a suitable film, it is preferable to use a chain transfer agent during the polymerization.
  • the amount of the chain transfer agent may be appropriately determined according to the type of monomer and the ratio thereof.
  • UV absorber Although there is no restriction
  • Organic ultraviolet absorbers, fine powder type ultraviolet blocking agents such as cerium oxide and magnesium oxide, titanium oxide, zinc oxide, iron oxide and the like, and organic ultraviolet absorbers are particularly preferable.
  • organic ultraviolet absorbers examples include JP-A-46-3335, JP-A-55-15276, JP-A-5-197004, JP-A-5-232630, JP-A-5-307232, JP-A-6-218131, and 8- No. 53427, No. 8-234364, No. 8-239368, No. 9-310667, No. 10-115898, No. 10-147777, No. 10-182621, German Patent No. 19739797A, European Patent Nos. 711804A and JP-A-8-501291, U.S. Pat. Nos. 1,023,859, 2,685,512, 2,739,888, 2,784,087. No. 2,748,021, No. 3,004,896, No.
  • UV absorbers having a molecular weight of 400 or more are less likely to volatilize at a high boiling point and are difficult to disperse even during high temperature molding, so that the weather resistance can be effectively improved with a relatively small amount of addition. it can.
  • the ultraviolet absorber having a molecular weight of 400 or more has little transferability from the thin translucent resin layer 6 to other constituent layers and hardly deposits on the surface of the laminate, the amount of contained ultraviolet absorber is small. It is preferable from the viewpoints of being maintained for a long time and being excellent in the durability of the weather resistance improving effect.
  • Examples of the ultraviolet absorber having a molecular weight of 400 or more include 2- [2-hydroxy-3,5-bis ( ⁇ , ⁇ -dimethylbenzyl) phenyl] -2-benzotriazole, 2,2-methylenebis [4- (1, 1,3,3-tetrabutyl) -6- (2H-benzotriazol-2-yl) phenol], bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis ( Hindered amines such as 1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and 2- (3,5-di-tert-butyl-4-hydroxybenzyl) -2-n-butylmalonic acid Bis (1,2,2,6,6-pentamethyl-4-piperidyl), 1- [2- [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy] Such as til] -4- [3- (3,5-di-tert-buty
  • 2- [2-hydroxy-3,5-bis ( ⁇ , ⁇ -dimethylbenzyl) phenyl] -2-benzotriazole and 2,2-methylenebis [4- (1,1,3,3- Tetrabutyl) -6- (2H-benzotriazol-2-yl) phenol] is particularly preferred.
  • the content of the ultraviolet absorber in the translucent resin layer is preferably 0.1 to 20% by mass, more preferably 1 to 15% by mass, and further preferably 3 to 10% by mass. Further, the content of the ultraviolet absorber in the translucent resin layer 6 is 0.17 to 2.28 g / m 2 per unit area of the film, more preferably, the content per unit area is 0.1. 4 to 2.28 g / m 2 or more.
  • the translucent resin layer may contain an antioxidant.
  • an antioxidant it is preferable to use a phenol-based antioxidant, a thiol-based antioxidant, or a phosphite-based antioxidant.
  • the above-mentioned antioxidant and a known light stabilizer can be used in combination.
  • the light stabilizer include hindered amine light stabilizers.
  • Examples of a method for forming the light-transmitting resin layer include a method by coating.
  • a resin constituting the translucent resin layer is dissolved or suspended in a suitable organic solvent to prepare a coating solution.
  • the coating solution is applied by a predetermined coating method to form a coating film.
  • various conventionally used coating methods such as spray coating, spin coating, and bar coating can be used.
  • a material that becomes a light-transmitting resin layer is directly applied on the resin base material or on the surface of a layer (for example, a gas barrier layer) provided on the light incident side of the resin base material.
  • a translucent resin layer can be formed.
  • a coating film is dried and a translucent resin layer is completed.
  • the smoothness of the translucent resin layer can be improved.
  • the center line average roughness (Ra) of the translucent resin layer formed by the coating method is preferably 3 nm or more and 20 nm or less. In other words, if the center line average roughness satisfies this value, the translucent resin film produced by melt film formation is not a translucent resin layer provided by bonding with an adhesive layer, but the translucent resin film. It can be considered that the conductive resin layer is provided by coating.
  • the center line average roughness (Ra) which is an index of smoothness of the translucent resin layer, can be determined by a measuring method based on JIS B0601-1982.
  • the resin base material supports the light reflecting layer that performs the essential function of the film mirror, and has a role of maintaining the mechanical strength of the entire film mirror. Moreover, when manufacturing a film mirror, it is a layer used as the board
  • the thickness of the resin base material can be set to an appropriate thickness according to the type and purpose of the resin. For example, it is generally in the range of 10 to 250 ⁇ m. The thickness is preferably 15 to 150 ⁇ m.
  • resin films can be used as the resin base material.
  • resin films cellulose ester film, polyester film, polycarbonate film, polyarylate film, polysulfone (including polyethersulfone) film, polyethylene terephthalate, polyethylene naphthalate polyester film, polyethylene film, polypropylene film, cellophane, Cellulose diacetate film, cellulose triacetate film, cellulose acetate propionate film, cellulose acetate butyrate film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene vinyl alcohol film, syndiotactic polystyrene film, polycarbonate film, norbornene resin film , Polymethylpentenef Can Lum, polyether ketone film, polyether ketone imide film, a polyamide film, a fluororesin film, a nylon film, polymethyl methacrylate film, and acrylic films.
  • polyester films such as polyethylene terephthalate, norbornene resin films, cellulose ester films, and acrylic films are preferable.
  • a polyester film such as polyethylene terephthalate or an acrylic film, and it may be a film manufactured by melt casting film formation or a film manufactured by solution casting film formation.
  • the light reflecting layer is a layer made of metal or the like having a function of reflecting sunlight.
  • the surface reflectance of the light reflection layer is preferably 80% or more, more preferably 90% or more.
  • the light reflecting layer is preferably formed of a material containing any element selected from the element group consisting of Al, Ag, Cr, Cu, Ni, Ti, Mg, Rh, Pt, and Au.
  • Al or Ag is a main component from the viewpoint of reflectance and corrosion resistance, and two or more such metal thin films may be formed.
  • a light reflecting layer mainly containing silver is used.
  • the reflectance may be further improved by providing a layer made of a metal oxide such as SiO 2 or TiO 2 in the light reflecting layer.
  • the thickness of the light reflecting layer is preferably 10 to 200 nm, more preferably 30 to 150 nm, from the viewpoint of reflectivity and the like.
  • the wet method is a general term for a plating method, and is a method of forming a film by depositing a metal from a solution. Specific examples include silver mirror reaction.
  • the dry method is a general term for a vacuum film-forming method. Specific examples include a resistance heating vacuum deposition method, an electron beam heating vacuum deposition method, an ion plating method, and an ion beam assisted vacuum deposition method. And sputtering method.
  • a vapor deposition method capable of a roll-to-roll method for continuously forming a film is preferably used in the present invention.
  • the light reflecting layer is formed by silver deposition.
  • the light reflection layer When forming the light reflection layer mainly composed of silver, the light reflection layer may be formed by heating and baking a coating film containing a silver complex compound from which a ligand can be vaporized and desorbed.
  • a coating film containing a silver complex compound from which a ligand can be vaporized and desorbed As the formation method by this wet method, for example, those described in paragraphs 0035 to 0056 of WO2013 / 103139 can be used.
  • the corrosion prevention layer is a resin layer containing a corrosion inhibitor.
  • the corrosion prevention layer is preferably adjacent to the light reflection layer from the viewpoint of preventing corrosion of the light reflection layer preferably made of silver, and is provided between the light reflection layer and the protective layer. Is more preferable. That is, from the light incident side, a translucent resin layer, a resin base material, a light reflecting layer, a corrosion prevention layer, a protective layer, and an adhesive layer are more preferably arranged in this order.
  • the corrosion prevention layer may consist of only one layer or may consist of a plurality of layers.
  • the corrosion prevention layer when the corrosion prevention layer is provided on the light incident side of the light reflection layer, the light-transmitting resin layer, the resin base material, the corrosion prevention layer, the light reflection layer, the protective layer, and the adhesive layer are arranged in this order. Arrangement. However, these arrangements are not limited, and the above light-transmitting resin layer may contain a corrosion inhibitor, and the light-transmitting resin layer may also serve as the corrosion preventing layer.
  • the total thickness of the corrosion prevention layer is preferably 1 to 10 ⁇ m, more preferably 2 to 8 ⁇ m.
  • Examples of the resin used for forming the corrosion prevention layer include cellulose ester, polyester, polycarbonate, polyarylate, polysulfone (including polyethersulfone), polyester such as polyethylene terephthalate and polyethylene naphthalate, polyethylene, polypropylene, cellophane, and cellulose. Diacetate, cellulose triacetate, cellulose acetate propionate, cellulose acetate butyrate, polyvinylidene chloride, polyvinyl alcohol, ethylene vinyl alcohol, syndiotactic polystyrene, polycarbonate, norbornene, polymethylpentene, polyetherketone, polyetherketone Imide, polyamide, fluororesin, nylon, polymethyl methacrylate, acrylic tree And the like can be given. Among these, an acrylic resin is preferable.
  • the resin material (binder) and the following corrosion inhibitors can be dissolved or dispersed in an organic solvent to prepare a coating solution, and the coating solution can be applied onto the light reflection layer to form a corrosion prevention layer. it can.
  • the corrosion inhibitor preferably has an adsorptive group for silver.
  • corrosion refers to a phenomenon in which metal (silver) is chemically or electrochemically eroded or deteriorated by the environmental material surrounding it (see JIS Z0103-2004).
  • the optimum content of the corrosion inhibitor varies depending on the compound to be used, but is generally preferably in the range of 0.1 to 1.0 g / m 2 .
  • Corrosion inhibitors having an adsorptive group for silver include amines and derivatives thereof, compounds having a pyrrole ring, compounds having a triazole ring such as benzotriazole, compounds having a pyrazole ring, compounds having a thiazole ring, and having an imidazole ring It is desirable to be selected from a compound, a compound having an indazole ring, a copper chelate compound, a thiourea, a compound having a mercapto group, a naphthalene-based compound, or a mixture thereof.
  • the ultraviolet absorber may also serve as a corrosion inhibitor. It is also possible to use a silicone-modified resin. It does not specifically limit as a silicone modified resin.
  • the corrosion inhibitor for example, compounds described in paragraphs 0057 to 0062 of WO2013 / 103139 can be used.
  • the present invention is characterized in that a protective layer containing particles and having a thickness of 20 to 75 ⁇ m is provided between the light reflecting layer and the adhesive layer.
  • a resin-made film mirror has a problem that the reflectance decreases when it is used by being attached to a light reflecting device.
  • the present inventor has found that when the light reflecting layer and the adhesive layer are arranged at a close distance, the adhesive layer has a small elasticity, and therefore the adhesive layer is deformed when attaching a film mirror or due to deterioration over time. As a result, it was found that the light reflecting layer is distorted.
  • the reflectance decreases due to the distortion of the light reflecting layer, and furthermore, in the light reflecting device for solar thermal power generation, the light cannot be condensed at a target position, thereby causing a decrease in power generation efficiency.
  • the protective layer having the specific thickness by providing the protective layer having the specific thickness, the distance between the light reflecting layer and the adhesive layer can be increased, the distortion of the light reflecting layer due to the influence of the deformation of the adhesive layer is reduced, and the reflectance Can remain high and constant.
  • the thickness of the protective layer is less than 20 ⁇ m, the adhesive layer and the light reflecting layer are close to each other, and the adhesive is affected by deformation. Therefore, the effect of preventing distortion of the light reflecting layer and preventing peeling of the layer is not sufficient.
  • it exceeds 75 ⁇ m the particles added to the protective layer are difficult to come out on the surface, so the adhesion between the adhesive layer and the light reflecting layer is inferior.
  • the protective layer and the layer on the back surface side for example, a translucent resin layer
  • the outermost layer on the back surface side for example, the translucent resin layer).
  • the thickness of the translucent protective layer is more preferably 20 to 50 ⁇ m, and further preferably 25 to 35 ⁇ m.
  • the thickness of the formed protective layer can be known by observing the cross section of the film mirror with an optical microscope of 500 to 1000 times.
  • the surface of the protective layer on the side opposite to the light reflecting layer can be made uneven.
  • the adhesive layer and the protective layer, which will be described later, mesh with each other, and the adhesion between the adhesive layer and the protective layer can be improved. Therefore, when the film mirror of the present invention is used in a light reflecting device, peeling between the adhesive layer and the protective layer can be prevented even when exposed to the atmosphere for a long time. This is because the surface state of the light reflecting surface is roughened due to peeling between the protective layer and the adhesive layer, and distortion may occur, resulting in a decrease in reflectance. In this way, a decrease in reflectance can be prevented, and the reflectance can be maintained high. It can be known that the surface of the protective layer has irregularities by observing the cross section of the film mirror with an optical microscope of 500 to 1000 times.
  • the resin material examples include polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyethylene, polypropylene, cellophane, and cellulose diacetate, cellulose triacetate (TAC), cellulose acetate butyrate, and cellulose.
  • PET polyethylene terephthalate
  • PEN polyethylene naphthalate
  • TAC cellulose triacetate
  • TAC cellulose acetate butyrate
  • Cellulose esters such as acetate propionate (CAP), cellulose acetate phthalate, cellulose nitrate or derivatives thereof, polyvinylidene chloride, polyvinyl alcohol, polyethylene vinyl alcohol, syndiotactic polystyrene, polycarbonate, norbornene resin, polymethylpentene, Polyether ketone, polyimide, polyether sulfone (PES), polysulfones, polyether ketone Bromide, polyamide, fluorine resin, nylon, polymethyl methacrylate, acrylic or polyarylates, and cycloolefin resins such as ARTON (trade name JSR Corp.) or APEL (trade name Mitsui Chemicals, Inc.).
  • CAP acetate propionate
  • CAP cellulose acetate phthalate
  • cellulose nitrate or derivatives thereof polyvinylidene chloride
  • polyvinyl alcohol polyethylene vinyl alcohol
  • syndiotactic polystyrene
  • the protective layer made of acrylic resin is preferably mainly composed of methacrylic resin.
  • the methacrylic resin may be a homopolymer of methacrylic acid ester or a copolymer of 50% by mass or more of methacrylic acid ester and 50% by mass or less of other monomers.
  • an alkyl ester of methacrylic acid is usually used.
  • a particularly preferred methacrylic resin is polymethyl methacrylate resin (PMMA).
  • PMMA polymethyl methacrylate resin
  • the polymethyl methacrylate resin suitable for the protective layer of the present invention has a weight average molecular weight of 100,000 to 1,000,000, more preferably 200,000 to 400,000.
  • the weight average molecular weight can be measured by a known method, for example, static light scattering, gel permeation chromatography (GPC), time-of-flight mass spectrometry (TOF-MASS), or the like.
  • GPC gel permeation chromatography
  • TOF-MASS time-of-flight mass spectrometry
  • the preferred monomer composition of the methacrylic resin is 50 to 100% by weight of methacrylic acid ester, 0 to 50% by weight of acrylic acid ester, and 0 to 49% by weight of other monomers based on the total monomers. More preferably, methacrylic acid ester is 50 to 99.9% by mass, acrylic acid ester is 0 to 50% by mass, and other monomers are 0 to 49% by mass.
  • a particularly preferred combination for the present invention is 75 to 98% by weight of methacrylic acid ester, 0 to 10% by weight of acrylic acid ester, and 1 to 20% by weight of other monomers.
  • alkyl methacrylate examples include methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, and the like.
  • the alkyl group usually has 1 to 8 carbon atoms, preferably 1 to 4 carbon atoms. Of these, methyl methacrylate is preferably used.
  • acrylic rubber SRB215, manufactured by Asahi Kasei Chemicals
  • Delpet registered trademark
  • acrylic resin manufactured by Asahi Kasei Chemicals and the like may be used.
  • alkyl acrylates include methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, and the like.
  • the alkyl group usually has 1 to 8 carbon atoms, preferably 1 to 4 carbon atoms. is there.
  • the monomer other than alkyl methacrylate and alkyl acrylate may be a monofunctional monomer, that is, a compound having one polymerizable functional group in the molecule, or a polyfunctional monomer, It may be a compound having at least two polymerizable functional groups in the molecule.
  • the monofunctional monomer include aromatic alkenyl compounds such as styrene, ⁇ -methylstyrene and vinyl toluene, and alkenyl cyan compounds such as acrylonitrile and methacrylonitrile.
  • polyfunctional monomers examples include polyunsaturated carboxylic acid esters of polyhydric alcohols such as ethylene glycol dimethacrylate, butanediol dimethacrylate, trimethylolpropane triacrylate, allyl acrylate, allyl methacrylate, and cinnamon.
  • Alkenyl esters of unsaturated carboxylic acids such as allyl acid
  • polyalkenyl esters of polybasic acids such as diallyl phthalate, diallyl maleate and triallyl cyanurate
  • diisocyanates such as 1,6-hexamethylene diisocyanate
  • divinylbenzene examples include aromatic polyalkenyl compounds.
  • alkyl methacrylate alkyl acrylate, and monomers other than these, respectively, you may use those 2 or more types as needed.
  • diisocyanates preferred are diisocyanates, and more preferred is 1,6-hexamethylene diisocyanate.
  • the glass transition temperature of the methacrylic resin is preferably 40 ° C. or higher, more preferably 60 ° C. or higher, from the viewpoint of heat resistance of the film. This glass transition temperature can be appropriately set by adjusting the type of monomer and the ratio thereof.
  • the methacrylic resin can be prepared by polymerizing the monomer component by a method such as suspension polymerization, emulsion polymerization or bulk polymerization. At that time, in order to obtain a suitable glass transition temperature or to obtain a viscosity showing a formability to a suitable film, it is preferable to use a chain transfer agent during the polymerization.
  • the amount of the chain transfer agent may be appropriately determined according to the type of monomer and the ratio thereof.
  • the protective layer of the present invention contains particles in order to make the surface uneven.
  • the particle size is preferably 5 to 30 ⁇ m, more preferably 10 to 20 ⁇ m, and the particles have a particle size of 0.
  • the content is preferably 1 to 5.0% by mass, more preferably 0.5 to 2.0% by mass. That is, in one embodiment of the present invention, the film mirror has a particle size of 5 to 30 ⁇ m, and the particle is contained in the protective layer in an amount of 0.1 to 5.0% by mass.
  • the particle diameter of the particles is 30 ⁇ m or less, the adhesiveness and the smoothness of the light reflecting layer are improved, and thus a decrease in reflectance can be prevented.
  • the fall of the adhesiveness by the increase in the distortion of an interlayer can be prevented, and the fall of a reflectance can be prevented.
  • grains in a protective layer is 0.1 mass% or more, the adhesive improvement effect will be enough and the improvement effect of a distortion will be acquired reliably.
  • it is 5 mass% or less, it can prevent that the smoothness of a light reflection layer falls.
  • the size of the irregularities on the surface of the protective layer can be controlled to some extent by changing the particle size and content of the particles.
  • the particle size of 5 to 30 ⁇ m means that 80% by mass or more of the particles contained in the protective layer have a particle size of 5 to 30 ⁇ m.
  • the particle diameter is the maximum distance of the particle figure sandwiched between two parallel lines as shown by d in FIG.
  • the particles do not have to be spherical as long as irregularities can be formed on the surface of the protective layer.
  • the protective layer has a shape in which particles are added, and the surface has irregularities.
  • the thickness is measured using a Nikon Digimicro MF-501 + counter MFC-101, with both concave and convex portions included, and measured at five points using a 5mm ⁇ measuring terminal. The value was defined as thickness.
  • the material of the particle is not particularly limited as long as it can maintain the shape in the protective layer and can provide unevenness on the surface.
  • Particles made of a material that easily disperses in the resin constituting the protective layer and is easily compatible with the material of the adhesive layer can be appropriately selected.
  • metal particles such as aluminum and nickel, inorganic oxide particles such as silica, alumina, titania and zirconia, resins such as acrylic resins, polyester resins, urethane resins, polyvinyl acetate resins and nitrile rubbers Particles, diatomaceous earth, talc, zeolite, etc. can be used. These may be used alone or in combination of two or more.
  • Inorganic oxide particles and resin particles are preferable, and acrylic resin particles and silica particles are particularly preferable because of excellent adhesion to the adhesive layer, cost, and weather resistance. That is, one embodiment of the present invention is the film mirror described above, wherein the particles are particles containing acrylic resin or silica.
  • acrylic resin particles polymethyl methacrylate resin particles are particularly preferable.
  • the polymethyl methacrylate resin suitable for the particles in the protective layer of the present invention preferably has a weight average molecular weight of 1000 to 10,000.
  • the resin constituting the protective layer is dissolved or suspended in an organic solvent, and the particles are dispersed in this solution to form a coating solution.
  • the coating solution is applied by a predetermined coating method to form a coating film.
  • various conventionally used coating methods such as spray coating, spin coating, and bar coating can be used.
  • the protective layer can be completed by drying.
  • the adhesive layer has adhesiveness that enables the film mirror to be attached to the support substrate, and the adhesive layer is used to join the film mirror to the support substrate to form a solar power generation reflection device. It is a constituent layer.
  • the adhesive layer is not particularly limited, and for example, any of a dry laminating agent, a wet laminating agent, an adhesive, a heat seal agent, a hot melt agent and the like can be used.
  • a polyester resin, a urethane resin, a polyvinyl acetate resin, an acrylic resin, a nitrile rubber, or the like is used as the adhesive.
  • acrylic resin is more preferable because it is easily available, is cost effective, and is excellent in weather resistance when a film mirror is used in a light reflecting device. That is, one Embodiment of this invention is said film mirror in which the adhesion layer contains an acrylic resin.
  • the thickness of the pressure-sensitive adhesive layer is usually preferably in the range of about 1 to 100 ⁇ m from the viewpoints of the pressure-sensitive adhesive effect, the drying speed, and the like.
  • the laminating method is not particularly limited, and for example, it is preferable to carry out the roll method continuously from the viewpoint of economy and productivity.
  • the film mirror may include a release sheet that covers the surface of the adhesive layer on the side opposite to the protective layer.
  • a film mirror has a peeling sheet, after peeling a peeling sheet from an adhesion layer, a film mirror can be affixed on a support base material through an adhesion layer.
  • peeling sheet is a member which covers the surface on the opposite side to the light-incidence side of the adhesion layer in a film mirror. For example, when the film mirror is shipped, the release sheet is attached to the adhesive layer, and then the release sheet is released from the adhesive layer of the film mirror, and the film mirror is attached to the support substrate to reflect the solar power generation reflection device. Can be formed.
  • the release sheet may be any sheet that can protect the adhesiveness of the adhesive layer.
  • a resin film or sheet subjected to surface processing such as vapor deposition is used.
  • the thickness of the release sheet is not particularly limited but is preferably in the range of 12 to 250 ⁇ m.
  • the film mirror of the present invention may be provided with a hard coat layer for the purpose of preventing damage to the surface of the film mirror and adhesion of dirt.
  • the transparent hard coat layer is preferably the outermost layer on the light incident side, or the second or third layer from the light incident side.
  • Another thin layer (preferably 1 ⁇ m or less) may be provided on the hard coat layer.
  • Examples of methods for producing the hard coat layer include conventionally known coating methods such as a gravure coating method, a reverse coating method, and a die coating method. In addition to applying and coating a predetermined material, various surface treatments and the like may be combined.
  • the thickness of the hard coat layer is preferably 0.05 ⁇ m or more and 10 ⁇ m or less from the viewpoint of preventing the film mirror from warping while obtaining sufficient scratch resistance. More preferably, they are 1 micrometer or more and 10 micrometers or less.
  • the material for forming the hard coat layer is not particularly limited as long as transparency, weather resistance, hardness, mechanical strength, and the like can be obtained.
  • the hard coat layer can be composed of acrylic resin, urethane resin, melamine resin, epoxy resin, organic silicate compound, silicone resin, and the like.
  • silicone resins and acrylic resins are preferable in terms of hardness and durability.
  • what consists of an active energy ray hardening-type acrylic resin or a thermosetting type acrylic resin is preferable at the point of sclerosis
  • the active energy ray-curable acrylic resin or thermosetting acrylic resin is a composition containing a polyfunctional acrylate, an acrylic oligomer, or a reactive diluent as a polymerization curing component.
  • Acrylic oligomers include polyester acrylates, urethane acrylates, epoxy acrylates, polyether acrylates, etc., including those in which a reactive acrylic group is bonded to an acrylic resin skeleton, and rigid materials such as melamine and isocyanuric acid. Those having an acrylic group bonded to the skeleton may also be used.
  • the reactive diluent has a function of a solvent in the coating process as a medium of the coating agent, and has a group that itself reacts with a monofunctional or polyfunctional acrylic oligomer. It becomes a copolymerization component.
  • polyfunctional acrylic cured paints include Mitsubishi Rayon Co., Ltd. (trade name “Diabeam (registered trademark)” series, etc.), Nagase Sangyo Co., Ltd. (trade name “Denacol (registered trademark)” series, etc.
  • thermosetting resin composed of a partially hydrolyzed oligomer of an alkoxysilane compound, a heat A hard coat made of a curable polysiloxane resin, an ultraviolet curable acrylic hard coat made of an acrylic compound having an unsaturated group, and a thermosetting inorganic material are preferable.
  • materials that can be used for the hard coat layer an aqueous colloidal silica-containing acrylic resin (Japanese Patent Laid-Open No. 2005-66824), a polyurethane-based resin composition (Japanese Patent Laid-Open No.
  • Resin film used Japanese Patent Laid-Open No. 2004-142161
  • photocatalytic oxide-containing silica film such as titanium oxide or alumina
  • photocatalytic film such as titanium oxide or niobium oxide having a high aspect ratio
  • photocatalyst Examples thereof include a fluorine-containing resin coating (Pierex Technologies), an organic / inorganic polysilazane film, and a film using a hydrophilization accelerator (AZ Electronics) in organic / inorganic polysilazane.
  • AZ Electronics hydrophilization accelerator
  • thermosetting silicone hard coat layer a partially hydrolyzed oligomer of an alkoxysilane compound synthesized by a known method can be used.
  • An example of the synthesis method is as follows. First, tetramethoxysilane or tetraethoxysilane is used as an alkoxysilane compound, and a predetermined amount of water is added to the alkoxysilane compound in the presence of an acid catalyst such as hydrochloric acid or nitric acid to remove by-produced alcohol from room temperature to 80 ° C. React with.
  • an acid catalyst such as hydrochloric acid or nitric acid
  • the alkoxysilane is hydrolyzed, and further, a partially hydrolyzed oligomer of the alkoxysilane compound having an average polymerization degree of 4 to 8 having two or more silanol groups or alkoxy groups in one molecule is obtained by the condensation reaction.
  • a curing catalyst such as acetic acid or maleic acid is added to this and dissolved in an alcohol or glycol ether organic solvent to obtain a thermosetting silicone hard coat liquid. And this is apply
  • the hard coat layer may contain an ultraviolet absorber or an antioxidant.
  • an ultraviolet absorber and antioxidant the ultraviolet absorber and antioxidant used with the above-mentioned translucent resin layer can be used.
  • a preferred UV absorber in a hard coat layer containing a polyfunctional acrylic monomer and a silicone resin is a benzotriazole UV absorber.
  • a benzotriazole-based ultraviolet absorber in the hard coat layer, it is possible to obtain an excellent effect that not only the weather resistance is further improved, but also the falling angle can be further reduced.
  • the compound represented by the following general formula (9) is contained in the hard coat layer, the effect of reducing the falling angle is remarkable.
  • the falling angle refers to a value obtained by dropping a water drop on a horizontal mirror and then gradually increasing the tilt angle of the mirror, and measuring the minimum angle at which the water drop of a predetermined mass that has been stationary falls. Say. It can be said that the smaller the tumbling angle, the easier the water droplets to roll off the surface, and the surface to which the water droplets hardly adhere.
  • the amount of the UV absorber used in the hard coat layer is preferably 0.1 to 20% by mass in order to improve the weather resistance while maintaining good adhesion. More preferably, it is 0.25 to 15% by mass, and more preferably 0.5 to 10% by mass.
  • an organic antioxidant such as a phenol-based antioxidant, a thiol-based antioxidant, and a phosphite-based antioxidant.
  • the falling angle can also be reduced by including an organic antioxidant in the hard coat layer.
  • An antioxidant and a light stabilizer may be used in combination.
  • the light stabilizer the same light stabilizer as that used in the above-described translucent resin layer can be used.
  • various additives can be further blended as necessary.
  • a surfactant for example, a leveling agent and an antistatic agent can be used.
  • the leveling agent is effective in reducing surface irregularities.
  • a dimethylpolysiloxane-polyoxyalkylene copolymer for example, SH190 manufactured by Toray Dow Corning Co., Ltd.
  • SH190 manufactured by Toray Dow Corning Co., Ltd. is suitable as the silicone leveling agent.
  • the gas barrier layer is preferably provided on the light incident side of the light reflecting layer, and is effective for preventing corrosion of the light reflecting layer.
  • the gas barrier layer is intended to prevent the deterioration of the humidity, particularly the deterioration of the resin base material and each component layer supported by the resin base material due to high humidity, but it has special functions and applications. As long as it has a deterioration preventing function, various types of gas barrier layers can be provided.
  • the water vapor permeability at 40 ° C. and 90% RH is preferably 1 g / m 2 ⁇ day or less, more preferably 0.5 g / m 2 ⁇ day or less, and still more preferably 0. .2 g / m 2 ⁇ day or less.
  • the oxygen permeability of the gas barrier layer is preferably 0.6 ml / m 2 / day / atm or less under the conditions of a measurement temperature of 23 ° C. and a humidity of 90% RH.
  • Examples of the method for forming the gas barrier layer include a method of forming an inorganic oxide by a method such as vacuum vapor deposition, sputtering, ion beam assist, chemical vapor deposition, and the like.
  • An inorganic oxide precursor by a sol-gel method is used.
  • a method of forming an inorganic oxide film by applying heat treatment and / or ultraviolet irradiation treatment to the coating film after coating is also preferably used.
  • the film mirror of this invention may provide an anchor layer between the resin base material and the light reflection layer.
  • the anchor layer is made of resin, and has an effect of closely adhering the resin base material and the light reflecting layer. Therefore, the anchor layer has an adhesion property that allows the resin base material and the light reflection layer to adhere to each other, heat resistance that can withstand heat when the light reflection layer is formed by a vacuum deposition method, and the high reflection that the light reflection layer originally has. Smoothness is required to bring out performance.
  • the resin material used for the anchor layer is not particularly limited as long as it satisfies the above conditions of adhesiveness, heat resistance, and smoothness.
  • Polyester resin, acrylic resin, melamine resin, epoxy resin, polyamide Resin, vinyl chloride resin, vinyl chloride vinyl acetate copolymer resin or the like, or a mixed resin thereof can be used. From the viewpoint of weather resistance, a polyester resin and a melamine resin mixed resin are preferable. It is more preferable to use a thermosetting resin mixed with a curing agent.
  • a method for forming the anchor layer conventionally known coating methods such as a gravure coating method in which a predetermined resin material is applied and applied, a reverse coating method, a die coating method and the like can be used.
  • the thickness of the anchor layer is preferably 0.01 to 3 ⁇ m, more preferably 0.1 to 1 ⁇ m. If thickness is 0.01 micrometer or more, the effect of an adhesive improvement will be acquired reliably, and since the unevenness
  • the film mirror of the present invention is suitable for use in a light reflecting device by sticking to a support substrate. Therefore, this invention also provides the light reflection apparatus for solar power generation which affixed said film mirror on the support base material.
  • One embodiment of the present invention is a light reflecting device for solar power generation in which the film mirror is attached to a support base material.
  • the solar power generation reflecting device is a reflecting mirror that includes a film mirror and a self-supporting support base material, and the film mirror is bonded to the support base material via an adhesive layer.
  • the "self-supporting property" as used herein means that the supporting substrate supports the edge portion of the film mirror in a state where the supporting substrate is cut to a size used as a supporting substrate of the solar power generation reflecting device.
  • the film mirror has rigidity enough to support the film mirror.
  • the support base material of the solar power generation reflecting device has self-supporting properties, so that it is easy to handle when installing the solar power generation reflecting device, and the holding member for holding the solar power generation reflecting device has a simple configuration. Therefore, it is possible to reduce the weight of the reflection device itself, and it is possible to suppress power consumption during solar tracking.
  • a self-supporting support base material there are one having a pair of metal flat plates and an intermediate layer interposed between the metal flat plates (type A), or one made of a resin material having a hollow structure (type B). It is preferable.
  • the support base material has a pair of metal flat plates and an intermediate layer interposed between the metal flat plates, and the intermediate layer is made of a material having a hollow structure or a resin material, whereby the support base material As well as having a high flatness due to the metal flat plate, it is possible to significantly reduce the weight of the support base material itself as compared to the case where the support base material is constituted only by the metal flat plate. In addition, since the rigidity can be increased by the metal flat plate while using a relatively lightweight intermediate layer, it is possible to function as a support substrate that is lightweight and has a self-supporting property.
  • the intermediate layer is made of a resin material
  • further weight reduction can be achieved by using a resin material layer having a hollow structure.
  • the intermediate layer when the intermediate layer has a hollow structure, the intermediate layer functions as a heat insulating material, so that the temperature change of the metal flat plate on the side opposite to the adhesive layer 8 is suppressed from being transmitted to the film mirror, and dew condensation occurs. It is possible to prevent or suppress deterioration due to heat.
  • the thermal conductivity such as steel plate, copper plate, aluminum plate, aluminum plated steel plate, aluminum alloy plated steel plate, copper plated steel plate, tin plated steel plate, chrome plated steel plate, stainless steel plate, etc.
  • a high metal material can be preferably used.
  • materials such as metals, inorganic materials (glass, etc.), resin materials, etc. can be used.
  • this intermediate layer has a hollow structure, a cellular structure made of foamed resin, a three-dimensional structure having a wall surface made of metal, an inorganic material or a resin material (honeycomb structure, etc.), a resin material to which hollow fine particles are added, etc. are applied. be able to.
  • the cellular structure of the foamed resin refers to a foamed or porous shape formed by finely dispersing gas in the resin material.
  • a known foamed resin material can be used as the material, but polyolefin resin, polyurethane, polyethylene, polystyrene and the like are preferably used.
  • the honeycomb structure represents a general three-dimensional structure composed of a plurality of small spaces surrounded by side walls.
  • the resin material constituting the wall surface is a homopolymer or copolymer of olefins such as ethylene, propylene, butene, isoprene pentene, and methylpentene.
  • Polyolefin eg, polypropylene, high density polyethylene
  • polyamide polystyrene
  • polyvinyl chloride polyacrylonitrile
  • acrylic derivatives such as ethylene-ethyl acrylate copolymer
  • polycarbonate vinyl acetate such as ethylene-vinyl acetate copolymer Copolymers
  • vinyl acetate such as ethylene-vinyl acetate copolymer Copolymers
  • ionomers terpolymers
  • terpolymers such as ethylene-propylene-dienes
  • thermoplastic resins such as ABS resin, polyolefin oxide, and polyacetal are preferably used.
  • these may be used individually by 1 type, or may mix and use 2 or more types.
  • thermoplastic resins olefin-based resins or resins mainly composed of olefin-based resins
  • polypropylene-based resins or resins based mainly on polypropylene-based resins are preferable because of excellent balance between mechanical strength and moldability.
  • the resin material may contain an additive.
  • the additive include silica, mica, talc, calcium carbonate, glass fiber, carbon fiber, and other inorganic fillers, plasticizers, stabilizers, colorants, charging agents.
  • An inhibitor, a flame retardant, a foaming agent, etc. are mentioned.
  • the intermediate layer can be a layer made of a resin plate.
  • the resin material constituting the intermediate layer the same material as that constituting the resin substrate of the film mirror described above is preferably used. be able to.
  • the intermediate layer need not be provided in all regions of the support base material, and provided in a part of the region as long as the flatness of the metal flat plate and the self-supporting property as the support base material can be ensured. May be.
  • the intermediate layer has the above-described three-dimensional structure, it is preferable to provide the three-dimensional structure in a region of about 90 to 95% with respect to the area of the metal flat plate. It is preferable to provide it.
  • the support substrate is a layer made of a resin material having a hollow structure.
  • the support base material is made of a resin material only, the thickness required to obtain a rigidity sufficient to provide self-supporting properties increases, resulting in an increase in the weight of the support base material.
  • the supporting substrate can be reduced in weight while providing self-supporting properties.
  • the support substrate is made of a resin material having a hollow structure
  • a resin material having a hollow structure as an intermediate layer, and to provide a resin sheet having smooth surfaces as the surface layers on both sides thereof. It is preferable from the viewpoint of increasing the rate.
  • the material of the resin sheet the same material as that constituting the resin substrate of the film mirror described above can be preferably used.
  • the resin material having a hollow structure the above-described foamed material and the resin material having a three-dimensional structure (honeycomb structure) can be preferably used.
  • the solar power generation reflection device has a holding member that holds the reflection device itself.
  • the holding member preferably holds the reflecting surface (film mirror) of the solar power generation reflecting device in a state where the sun can be tracked.
  • the form of the holding member is not particularly limited, but for example, a plurality of places on the support base on the back side of the solar power generation reflecting device are formed in a bar shape so that the solar power generating reflection device can hold a desired shape and posture.
  • the form held by a columnar member or a beam-like member is preferable.
  • the holding member has a configuration for holding the solar power generation reflecting device in a state in which the sun can be tracked.
  • the holding member may be driven manually, or a separate driving device may be provided to automatically track the sun. It is good also as composition to do.
  • Example 1 A resin film which is a biaxially stretched polyester film (polyethylene terephthalate film thickness 25 ⁇ m) was used as the resin substrate.
  • polyethylene terephthalate film thickness 25 ⁇ m On one surface of the polyethylene terephthalate film, polymethylmethacrylic (PMMA) resin (EMB457 manufactured by Mitsubishi Rayon), acrylic rubber (SRB215 Asahi Kasei Chemicals), HDMI isocyanate (1,6-hexamethylene diisocyanate) in a resin solid content ratio, The mixture was mixed into methyl ethyl ketone at 17: 3: 2 so that the solid content concentration was 22%. This solution was coated by an applicator bar coater method to form a translucent resin layer having a thickness of 25 ⁇ m.
  • PMMA polymethylmethacrylic
  • a light reflecting layer made of silver having a thickness of 100 nm was formed on the opposite surface of the supporting substrate by vacuum deposition.
  • a silver corrosion inhibitor is applied to a resin in which a polyester resin and a TDI (2.4-tolylene diisocyanate) isocyanate are mixed at a resin solid content ratio of 10: 2 on the silver light reflection layer.
  • 2-mercaptobenzothiazole was added so as to be 10% by mass with respect to the resin, and a coating solution was prepared so as to be 5% in methyl ethyl ketone. This coating solution was coated on the light reflection layer by a gravure coating method to form a corrosion prevention layer having a thickness of 3 ⁇ m.
  • PMMA resin EMB457, manufactured by Mitsubishi Rayon
  • acrylic rubber SRB215, Asahi Kasei Chemicals
  • HDMI-based isocyanate (1,6-hexamethylene diisocyanate
  • PMMA filler manufactured by Soken Chemical Co., Ltd., MX1500, particle size 15 ⁇ m
  • This coating solution was coated by an applicator bar coater method to form a protective layer having a thickness of 20 ⁇ m.
  • acrylic pressure-sensitive adhesive Netsu KP-2254, manufactured by Nippon Carbide Industries
  • HDMI-based isocyanate (1,6-hexamethylene diisocyanate) are in a resin solid content ratio of 27: 1 so that the solid content concentration is 15%.
  • the mixture was mixed with ethyl acetate to prepare a coating solution.
  • This coating solution was coated on the protective layer by an applicator bar coater method to form an adhesive layer having a thickness of 25 ⁇ m.
  • the film mirror of Example 1 was obtained as described above.
  • the obtained film mirror evaluated the following light reflection layer distortion
  • the evaluation results are shown in Tables 1-1 and 1-2 below.
  • ⁇ Blocking> In the manufacturing process, it may be wound in a state where the translucent resin layer and the protective layer are in contact with each other, and if both layers are adhered at that time, there is a concern that the surfaces of both layers become rough and cause a decrease in reflectance. is there. Therefore, it is preferable that blocking does not occur.
  • a film mirror sample was cut out to 10 cm ⁇ 10 cm, the translucent resin layer and the protective layer were overlapped, and a load of 7 g / cm 2 was applied at 23 ° C. for 72 hours. Then, the blocking state at the time of peeling off a protective layer was confirmed.
  • the evaluation criteria were as follows. 5: No peeling at all and no peeling of the layer.
  • a spectrophotometer “UH4150” manufactured by Hitachi High-Tech was used to adjust the incident angle of incident light to 5 ° with respect to the normal of the reflecting surface, and the regular reflectance at a reflection angle of 5 ° was measured. Evaluation was carried out as an average reflectance of 250 nm to 2500 nm.
  • Examples 2 to 9 A film mirror was produced in the same manner as in Example 1 except that the thickness of the protective layer to be formed and the kind of particles were changed as shown in Table 1-1 below. The obtained film mirror was evaluated in the same manner as in Example 1. The evaluation results are shown in Tables 1-1 and 1-3 below.

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Abstract

Le problème à résoudre dans le cadre de la présente invention consiste à fournir : un miroir à film susceptible de prévenir une diminution de la réflectance lorsqu'il est utilisé fixé à un substrat de support ; et un dispositif de réflexion de la lumière l'utilisant. La présente invention concerne donc un miroir à film comprenant, dans l'ordre depuis le côté d'incidence de la lumière : une couche de résine translucide ; un substrat de résine ; une couche de réflexion de la lumière ; une couche de protection qui contient des particules et dont l'épaisseur est comprise entre 20 et 75 µm ; et une couche adhésive qui est en contact avec la couche de protection.
PCT/JP2014/076720 2013-10-29 2014-10-06 Miroir à film et dispositif de réflexion de la lumière l'utilisant et servant pour une réflexion de la chaleur solaire WO2015064312A1 (fr)

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JP2013-224556 2013-10-29
JP2013224556A JP2016224076A (ja) 2013-10-29 2013-10-29 フィルムミラーおよびこれを用いた太陽熱反射用光反射装置

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JP2012004546A (ja) * 2010-05-17 2012-01-05 Fujifilm Corp 太陽電池用バックシート用ポリマーシート、及び太陽電池モジュール
JP2012008166A (ja) * 2010-06-22 2012-01-12 Konica Minolta Opto Inc 太陽熱発電用フィルムミラー、太陽熱発電用フィルムミラーの製造方法及び、太陽光発電用反射装置
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