JPWO2012056953A1 - Mirror for reflecting sunlight and reflector for solar power generation - Google Patents

Abstract

In order from the side where sunlight enters, a solar reflective mirror having a resin plate protective layer, a resin plate, a metal reflective layer, and a metal corrosion prevention layer, wherein the resin plate protective layer is inorganic oxide A solar reflective mirror, which is at least one of a film layer or a curable resin film layer containing an ultraviolet absorber.

Description

  The present invention relates to a solar reflective mirror provided with a metal reflective layer and a solar power generation reflective apparatus using the solar reflective mirror.

In recent years, global warming has developed into a more serious situation, and even the future survival of humankind may be threatened. The main cause is thought to be atmospheric carbon dioxide (CO ₂ ) released from fossil fuels that have been used in large quantities as an energy source in the 20th century. Therefore, it is considered that it will not be allowed to continue using fossil fuels in the near future. On the other hand, the depletion of oil and natural gas, once thought to be inexhaustible, has become a reality due to the increase in energy demand accompanying the rapid economic growth of so-called developing countries such as China, India and Brazil. Yes.

  Natural energy such as biomass energy, wind energy, and solar energy is currently being investigated as alternative energy alternatives to fossil fuel energy such as oil and natural gas, and is the most stable alternative energy for fossil fuels, and A large amount of natural energy is considered to be solar energy.

  However, although solar energy is a very powerful alternative energy, from the viewpoint of utilizing it, (1) the energy density of solar energy is low, and (2) it is difficult to store and transfer solar energy. Is considered to be a problem.

  On the other hand, it has been proposed to solve the problem that the energy density of solar energy is low by collecting solar energy with a huge reflector.

  Since the reflection device is exposed to ultraviolet rays and heat generated by solar heat, wind and rain, sandstorms, and the like, glass mirrors have conventionally been used. While glass mirrors are highly durable to the environment, they can be damaged during transportation, and when they become large glass mirrors, they have a considerable mass, so it is necessary to have the strength of the base on which the mirrors are installed. There was a problem that the construction cost of the plant was high.

  In addition, glass mirrors are easily damaged, and it is necessary to consider not to be injured at the damaged part when replacing them. In many cases, they are installed outdoors, and the work environment (wind, rain, sand, dust, etc.) ), And skill is required for replacement work at the time of replacement.

  In order to solve the above problem, for example, Patent Document 1 discloses a method of replacing a glass mirror with a resin reflection sheet.

  When the glass mirror is replaced with a thin film made of resin, it can be wound in a roll shape, so that continuous film formation is possible and production efficiency can be increased. However, the resinous film has a defect that the environmental resistance is inferior to that of glass. In order to overcome the environmental resistance, an acrylic resin containing a UV absorber is bonded to the outermost surface with a pressure sensitive adhesive. However, with this method, poor performance frequently occurs due to entrainment of bubbles or dust when two types of films are bonded. Further, in the case of a thin film, it is stuck on a rigid plate to fix the shape when used, but this also causes a problem of air bubbles and dust mixing. For this reason, the yield cannot be kept low, and the cost increases as a whole.

  On the other hand, for example, as disclosed in Patent Document 2, a method of forming a highly reflective silver reflective layer on the surface of a metal plate by plating has been developed. It becomes difficult to install and replace. Moreover, although the silver reflection layer is formed on the surface of the metal plate, the result of the silver reflection layer depends on the surface processing accuracy of the metal plate and the coating accuracy of the binder.

  As means for solving the problems listed in Patent Document 1 and Patent Document 2, a method of forming a reflective layer on the back surface of a resin plate as disclosed in Patent Document 3 and applying a protective layer to the surface of the reflective layer There is. Since the resin plate is light and does not break like glass, it has good transportability and workability.

  However, as a result of our intensive studies, it was found that the method of Patent Document 3 cannot be used outdoors for a long time. Here, the long term is a period of one year or more. When exposed to harsh outdoor environments, deterioration due to the resin plate occurs. For example, the acrylic board has a large water absorption of 3%, and the outdoor environment such as a desert has a temperature difference between day and night, so that the acrylic resin board is repeatedly deformed by repeatedly absorbing and releasing moisture in the air. Polycarbonate absorbs ultraviolet B waves (UV-B: wavelength 280 to 315 nm) contained in sunlight and causes a photochemical reaction to break the polymer chain, resulting in yellowing and cracking. Therefore, the performance cannot be maintained only by forming a reflective layer on a resin (plastic) plate as in Patent Document 3.

Special table 2009-520174 International Publication No. 2008/149717 JP 2010-107854 A

  The present invention has been made in view of the above-described problems and circumstances, and its solution is a solar that can be manufactured with simple production equipment, has high regular reflectance, is inexpensive, lightweight, and has excellent weather resistance. It is to provide a light reflecting mirror. Moreover, it is providing the solar power generation reflective apparatus provided with the said solar reflective mirror.

  The above-mentioned problem according to the present invention is solved by the following means.

  1. In order from the side on which sunlight enters, a solar reflective mirror having a resin plate protective layer, a resin plate, a metal reflective layer, and a metal corrosion prevention layer, wherein the resin plate protective layer is inorganic oxide A solar reflective mirror, which is at least one of a film layer or a curable resin film layer containing an ultraviolet absorber.

  2. 2. The solar reflective mirror according to item 1, wherein the resin plate contains a resin selected from a resin group consisting of a methacrylic resin, a polycarbonate resin, and a polyethylene terephthalate resin.

  3. 3. The solar reflective mirror according to claim 1 or 2, wherein the metal reflective layer is formed by a wet method and contains silver or a silver alloy.

  4). 4. The solar reflective mirror according to claim 1, wherein the resin plate protective layer has a gas barrier property.

  5. The said resin board protective layer is the said curable resin film layer, The said curable resin film layer contains a thermosetting resin or an ultraviolet curable resin, The sunlight reflection of the said 1st item | term characterized by the above-mentioned. For mirror.

  6). A solar power generation reflecting device, comprising the solar light reflecting mirror according to any one of the first to fifth aspects.

  The present invention can provide a solar reflective mirror that can be manufactured with simple production equipment, has a high regular reflectance, is inexpensive, lightweight, and has excellent weather resistance. Moreover, the solar power generation reflective apparatus provided with the said solar reflective mirror can be provided.

It is a schematic sectional drawing which shows an example of the typical layer structure of the mirror for sunlight reflection of this invention.

  The solar reflective mirror of the present invention is a solar reflective mirror having a configuration in which a resin plate protective layer, a resin plate, a metal reflective layer, and a metal corrosion prevention layer are provided in order from the side on which sunlight enters. The resin plate protective layer is at least one of an inorganic oxide film layer or a curable resin film layer containing an ultraviolet absorber. This feature is a technical feature common to the inventions according to claims 1 to 6.

  As an embodiment of the present invention, it is preferable that the resin plate contains a resin selected from a resin group consisting of a methacrylic resin, a polycarbonate resin, and a polyethylene terephthalate resin from the viewpoint of manifesting the effects of the present invention. Furthermore, it is preferable that the metal reflection layer is formed by a wet method and contains silver or a silver alloy.

  In the present invention, it is preferable that the resin plate protective layer has a gas barrier property. Moreover, it is preferable that the said curable resin film layer which is the said resin board protective layer contains a thermosetting resin or an ultraviolet curable resin.

  The solar reflective mirror of this invention can be used suitably for the solar power generation reflective apparatus.

  Hereinafter, the present invention, its components, and modes and modes for carrying out the present invention will be described in detail. In addition, in this application, "-" is used in the meaning which includes the numerical value described before and behind that as a lower limit and an upper limit.

《Configuration of solar reflection mirror and solar power generation reflection device》
The solar reflective mirror of the present invention is a solar reflective mirror having a configuration in which a resin plate protective layer, a resin plate, a metal reflective layer, and a metal corrosion prevention layer are provided in order from the side on which sunlight enters. The resin plate protective layer is at least one of an inorganic oxide film layer or a curable resin film layer containing an ultraviolet absorber.

  FIG. 1 is a schematic cross-sectional view showing an example of a typical layer configuration of a solar reflective mirror of the present invention. FIG. 1 shows an example of a preferred configuration of the solar light reflecting mirror of the present invention. That is, the solar reflective mirror 1 of the present invention includes a resin plate protective layer 2, a resin plate 3, an anchor layer 4, a metal reflective layer 5, and a metal corrosion prevention layer 6 in order from the side on which sunlight enters. This is a mirror for reflecting sunlight. In this configuration, the anchor layer is not essential, but an embodiment including the anchor layer is preferable.

  As in the configuration defined in the present invention, by disposing a resin plate protective layer on the sunlight incident side in the sunlight reflecting mirror, moisture exposure in an outdoor environment, durability against ultraviolet exposure increases, High reflectivity can be maintained over a long period of one year or longer. In the mirror for sunlight reflection, deformation due to water absorption, yellowing due to ultraviolet rays, and cracks do not occur, so that more light reaches the metal reflection layer, which is the reflection surface of sunlight, to increase power generation efficiency per unit area Can do.

  Below, each component of the solar reflective mirror of this invention is demonstrated.

[Resin plate]
The material of the resin plate is preferably a plate containing any of polyester, polyethylene terephthalate, polyethylene naphthalate, acrylic, polycarbonate, polyolefin (particularly, cycloolefin resin), cellulose, and polyamide in terms of weight reduction. Among these, excellent in weather resistance, and in particular, an acrylic copolymer obtained by copolymerizing at least two or more acrylic monomers, or a cycloolefin resin is preferable.

  Specific examples of suitable acrylic copolymers include methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, and butyl methacrylate. Mainly one or more monomers selected from monomers having no functional group in the side chain such as alkyl (meth) acrylate such as cyclohexyl methacrylate and 2-ethylhexyl methacrylate (hereinafter referred to as non-functional monomers) One or more monomers selected from monomers such as 2-hydroxyethyl methacrylate, glycidyl methacrylate, acrylic acid, methacrylic acid, and itaconic acid Combination of one or more monomers having functional groups such as OH and COOH in the side chain (hereinafter referred to as functional monomers), solution polymerization method, suspension polymerization method, emulsion polymerization method, bulk polymerization method, etc. Examples thereof include acrylic copolymers having a weight average molecular weight of 40,000 to 1,000,000, preferably 100,000 to 400,000, which are obtained by copolymerization according to the above polymerization method. Among them, ethyl acrylate, methyl acrylate, 2-ethylhexyl methacrylate are mentioned. 50 to 90% by mass of a non-functional monomer that gives a polymer having a relatively low Tg, such as 10 to 50% by mass of a non-functional monomer that gives a polymer having a relatively high Tg, such as methyl methacrylate, isobutyl methacrylate, cyclohexyl methacrylate, Officials such as 2-hydroxyethyl methacrylate, acrylic acid, itaconic acid Acrylic polymers such as those containing sex monomer 0 to 10% by weight is most preferred.

  Moreover, the cycloolefin resin which can be used suitably for the resin board which concerns on this invention consists of polymer resin containing an alicyclic structure. A preferred cycloolefin resin is a resin obtained by polymerizing or copolymerizing a cyclic olefin. Examples of the cyclic olefin include norbornene, dicyclopentadiene, tetracyclododecene, ethyltetracyclododecene, ethylidenetetracyclododecene, tetracyclo [7.4.0.110, 13.02,7] trideca-2,4. Unsaturated hydrocarbons of polycyclic structures such as 6,11-tetraene and derivatives thereof; cyclobutene, cyclopentene, cyclohexene, 3,4-dimethylcyclopentene, 3-methylcyclohexene, 2- (2-methylbutyl) -1-cyclohexene, cyclo Examples thereof include monocyclic unsaturated hydrocarbons such as octene, 3a, 5,6,7a-tetrahydro-4,7-methano-1H-indene, cycloheptene, cyclopentadiene, cyclohexadiene, and derivatives thereof.

  Preferred cycloolefin resins may be those obtained by addition copolymerization of monomers other than cyclic olefins. Addition copolymerizable monomers include ethylene, propylene, 1-butene, 1-pentene, and other ethylene or α-olefins; 1,4-hexadiene, 4-methyl-1,4-hexadiene, 5-methyl- Examples include dienes such as 1,4-hexadiene and 1,7-octadiene.

  Examples of the cycloolefin resin include the following norbornene resins. The norbornene-based resin preferably has a norbornene skeleton as a repeating unit. Specific examples thereof include, for example, JP-A Nos. 2003-139950, 2003-14901, and 2003-161832. JP-A 2003-195268, JP-A 2003-111588, JP-A 2003-211589, JP-A 2003-268187, JP-A 2004-133209, JP-A 2004-3091979, JP 2005-121813, JP 2005-164632, JP 2006-72309, JP 2006-178191, JP 2006-215333, JP 2006-268065, JP 2006. -299199 and the like Including without being limited thereto. Moreover, these may be used individually by 1 type and may use 2 or more types together. Specifically, ZEONEX, ZEONOR manufactured by Nippon Zeon Co., Ltd., Arton manufactured by JSR Corporation, APPEL manufactured by Mitsui Chemicals, Inc. (APL8008T, APL6509T, APL6013T, APL5014DP, APL6015T) and the like are preferably used.

  The thickness of the resin plate is preferably 0.5 to 5 mm, more preferably 1 to 3 mm.

  If the thickness is 0.5 mm or more, generation of wrinkles and breakage at the time of mirror processing for sunlight reflection can be prevented, and a highly uniform base material can be formed. Moreover, if it is 5 mm or less, the influence of the reflectance fall at the time of refuse adhering to the surface can be suppressed lightly, and it can reduce in weight. A resin plate protective layer is formed on at least one surface of the resin plate surface.

(Resin plate protective layer)
The resin plate protective layer according to the present invention is intended to protect a resin plate, a layer containing a resin, and the like, and the resin plate protective layer is cured containing an inorganic oxide film layer or an ultraviolet absorber. It is at least one of the functional resin film layers.

  In the present invention, the resin plate protective layer may serve both as an inorganic oxide film layer and a curable resin film layer containing an ultraviolet absorber. In this case, the resin plate protective layer may have a single layer structure or a plurality of two or more layers.

  In the present invention, the resin plate protective layer preferably has gas barrier properties. In particular, the inorganic oxide film layer is preferably a gas barrier layer as described below.

(Inorganic oxide film layer: gas barrier layer)
The gas barrier layer according to the present invention is for preventing deterioration of humidity, particularly deterioration of various functional elements protected by the resin base material and the resin base material due to high humidity, but has a special function and application. The gas barrier layer of various embodiments can be provided.

As the moisture barrier property of the gas barrier layer, the water vapor permeability at 40 ° C. and 90% RH is 100 g / m ² · day or less, preferably 50 g / m ² · day or less, more preferably 20 g / m ² · day or less. Thus, it is preferable to adjust the moisture resistance of the gas barrier layer. Also. The oxygen permeability is preferably 0.6 ml / m ² · day or less under the conditions of a measurement temperature of 23 ° C. and a humidity of 90% RH.

  The gas barrier layer according to the present invention is not particularly limited in its formation method, but after applying the ceramic precursor of the inorganic oxide film, the inorganic oxide film is formed by heating and / or ultraviolet irradiation of the coating film. The method is preferably used.

  Examples of the gas barrier layer include silicon oxide, aluminum oxide, or composite oxides starting from silicon oxide and aluminum oxide, zinc oxide, tin oxide, indium oxide, niobium oxide, chromium oxide, and the like. From the viewpoint, silicon oxide, aluminum oxide, or a composite metal oxide starting from silicon or aluminum is preferable. In addition, a multilayer film in which a low refractive index film having a refractive index of 1.35 to 1.8 at a wavelength of 550 nm and a high refractive index film having a refractive index of 1.85 to 2.8 at a wavelength of 550 nm are alternately laminated. Also good. Examples of the low refractive index film material include silicon oxide, aluminum oxide, silicon nitride, and aluminum nitride. Examples of the high refractive index film material include niobium oxide, titanium oxide, zinc oxide, tin oxide, indium oxide, tantalum oxide, and zirconium oxide. By alternately laminating the low refractive index film and the high refractive index film, the function of the gas barrier layer and the ultraviolet reflection function can be provided at the same time. The ultraviolet reflection function protects the lower resin plate in the same manner as the ultraviolet absorption function.

  These are formed by a vacuum process such as a vacuum deposition method, a sputtering method, a PVD method (physical vapor deposition method) such as ion plating, or a CVD method (chemical vapor deposition method). The thickness of the gas barrier layer made of metal oxide is preferably in the range of 5 to 800 nm, more preferably in the range of 10 to 300 nm.

  In addition to the dry layer formation described above, wet layer formation, specifically, a coating method is also possible.

  As a gas barrier layer formation by coating, coating and curing of a polysilazane liquid can be mentioned. For example, a coating solution in which polysilazane as disclosed in JP-T-2009-503157 is dispersed in a solvent is applied. By curing the polysilazane coating film by light irradiation, a dense gas barrier layer can be obtained in a short time. A dense gas barrier film can also be obtained by adding a catalyst and heat-curing. The ratio of polysilazane in the solvent is generally 1 to 80% by mass of polysilazane, preferably 5 to 50% by mass, and particularly preferably 10 to 40% by mass.

  As the solvent, water and a reactive group (for example, hydroxyl group or amine group) are not included, and an organic system which is inert to polysilazane and preferably an aprotic solvent is particularly suitable. This includes, for example, aliphatic or aromatic hydrocarbons, halogen hydrocarbons, esters such as ethyl acetate or butyl acetate, ketones such as acetone or methyl ethyl ketone, ethers such as tetrahydrofuran or dibutyl ether, and mono- and polyalkylene glycol dialkyl ethers. (Diglymes) or a mixture of these solvents.

  An additional component of the polysilazane solution is a binder such as those commonly used in the production of paints. For example, cellulose ethers and cellulose esters such as ethyl cellulose, nitrocellulose, cellulose acetate or cellulose acetobutyrate, natural resins such as rubber or rosin resins, or synthetic resins such as polymerized resins or condensed resins such as aminoplasts, in particular Urea resins and melamine formaldehyde resins, alkyd resins, acrylic resins, polyesters or modified polyesters, epoxides, polyisocyanates or blocked polyisocyanates, or polysiloxanes.

Still other components of the polysilazane formulation include, for example, additives that affect the formulation viscosity, substrate wetting, film formability, lubrication or exhaust properties, or inorganic nanoparticles such as SiO ₂ , TiO ₂ , It can be ZnO, ZrO ₂ or Al ₂ O ₃ . By using such a method, it is possible to produce a dense glass-like layer excellent in a high barrier action against gas because there are no cracks and holes.

  According to the method of the present invention, a gas barrier layer is produced with a resin plate, and thus a silicon oxide layer or an aluminum oxide layer obtained in this way, or a composite oxide layer using silicon oxide and aluminum oxide as a starting material is oxygen, carbon dioxide. Excellent barrier action against carbon or air gas or water vapor.

  Moreover, it is preferable that the average value of the light transmittance of the resin plate in which the gas barrier layer is formed is 90% or more. Thereby, there is no light loss and sunlight can be reflected efficiently.

(Curable resin film layer containing UV absorber)
In the present invention, the resin plate protective layer is an inorganic oxide film layer or a curable resin film layer containing an ultraviolet absorber. The curable resin film layer is a layer containing a resin that is cured by heat, ultraviolet rays, or the like.

  The resin plate protective layer according to the present invention preferably contains an ultraviolet absorber from the viewpoint of improving weather resistance and light resistance.

  The ultraviolet absorber used in the protective layer for the resin plate according to the present invention is excellent in the ability to absorb ultraviolet rays having a wavelength of 370 nm or less and has little absorption of visible light having a wavelength of 400 nm or more from the viewpoint of using sunlight. Is preferred.

  Examples of the ultraviolet absorber used in the present invention include oxybenzophenone compounds, benzotriazole compounds, salicylic acid ester compounds, benzophenone compounds, cyanoacrylate compounds, nickel complex compounds, triazine compounds, and the like. However, benzophenone compounds, less colored benzotriazole compounds, and triazine compounds are preferable. Further, ultraviolet absorbers described in JP-A Nos. 10-182621 and 8-337574, and polymer ultraviolet absorbers described in JP-A Nos. 6-148430 and 2003-113317 may be used.

  Specific examples of the benzotriazole ultraviolet absorber include 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-tert-butylphenyl) benzo Triazole, 2- (2'-hydroxy-3'-tert-butyl-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'-di-tert-butylphenyl) -5 Chlorobenzotriazole, 2- (2′-hydroxy-3 ′-(3 ″, 4 ″, 5 ″, 6 ″ -tetrahydrophthalimidomethyl) -5′-methylphenyl) benzotriazole, 2,2-methylenebis (4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol), 2- (2'-hydroxy- '-Tert-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3'-tert-butyl-5'-(2-octyloxycarbonylethyl) -phenyl) -5 -Chlorobenzotriazole, 2- (2'-hydroxy-3 '-(1-methyl-1-phenylethyl) -5'-(1,1,3,3-tetramethylbutyl) -phenyl) benzotriazole, 2 -(2H-benzotriazol-2-yl) -6- (linear and side chain dodecyl) -4-methylphenol, octyl-3- [3-tert-butyl-4-hydroxy-5- (chloro-2H- Benzotriazol-2-yl) phenyl] propionate and 2-ethylhexyl-3- [3-tert-butyl-4-hydroxy-5- (5-chloro-2) - can be exemplified mixtures of benzotriazol-2-yl) phenyl] propionate, and the like.

  As commercially available products, TINUVIN 171, TINUVIN 900, TINUVIN 928, TINUVIN 360 (all manufactured by BASF Japan), LA31 (manufactured by ADEKA), RUVA-100 (Otsuka) Chemical).

  Specific examples of benzophenone compounds include 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, bis (2-methoxy-4-hydroxy- 5-benzoylphenylmethane) and the like, but are not limited thereto.

  In this invention, it is preferable that the said curable resin film layer which is the said resin board protective layer contains a thermosetting resin or an ultraviolet curable resin.

  In the present invention, as the thermosetting resin, acrylate resins such as various epoxy resins, epoxy group-containing (meth) acrylates and urethane-modified (meth) acrylates can be used. Here, examples of the epoxy resin include bisphenol A (BPA) type epoxy resin, bisphenol F (BPF) epoxy resin, and novolac type epoxy resin. Among these thermosetting resins, bisphenol A (BPA) type epoxy resins and bisphenol F (BPF) epoxy resins are suitable.

  UV curable resins include methyl acrylate, ethyl acrylate, isopropyl acrylate, isobutyl acrylate, epoxy acrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, trimethylol propane triacrylate, dimethylol tricyclodecane diacrylate, tetramethylene glycol tetraacrylate 2-hydroxy-1,3-diacryloxypropane, 2,2-bis [4- (acryloxymethoxy) phenyl] propane, 2,2-bis [4- (acryloxyethoxy) phenyl] propane, dicyclo Various acrylate resins such as pentenyl acrylate, tricyclodecanyl acrylate, tris (acryloxyethyl) isocyanurate, and the aforementioned thermosetting resins Available epoxy group-containing (meth) acrylate, acrylate resins such as urethane-modified (meth) acrylate. Moreover, these may be used individually by 1 type and may use 2 or more types together. Further, methacrylate may be used instead of such acrylate.

  When an ultraviolet curable resin is used, it is necessary to add a photopolymerization initiator. Examples include benzoin ethers such as benzoin ethyl ether and isopropyl benzoin ether; benzyl ketals such as benzylhydroxycyclohexyl phenyl ketone; ketones such as benzophenone and acetophenone and derivatives thereof; thioxanthones; bisimidazoles and the like. These may be used alone or in combination of two or more. Moreover, you may add sensitizers, such as amines, a sulfur compound, a phosphorus compound, to these photoinitiators in arbitrary ratios as needed.

(Antioxidants, stabilizers)
The resin plate protective layer according to the present invention preferably contains an antioxidant or a stabilizer. Examples of the antioxidant that can be preferably applied to the resin plate protective layer according to the present invention include a phenol-based antioxidant, a thiol-based antioxidant, and a phosphite-based antioxidant.

  Examples of the phenolic antioxidant include 1,1,3-tris (2-methyl-4-hydroxy-5-t-butylphenyl) butane and 2,2′-methylenebis (4-ethyl-6-t-). Butylphenol), tetrakis- [methylene-3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, 2,6-di-t-butyl-p-cresol, 4,4 '-Thiobis (3-methyl-6-tert-butylphenol), 4,4'-butylidenebis (3-methyl-6-tert-butylphenol), 1,3,5-tris (3', 5'-di-t -Butyl-4'-hydroxybenzyl) -S-triazine-2,4,6- (1H, 3H, 5H) trione, stearyl-β- (3,5-di-t-butyl-4-hydroxyphenyl) propio Triethyl glycol bis [3- (3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate], 3,9-bis [1,1-di-methyl-2- [β- (3 -T-butyl-4-hydroxy-5-methylphenyl) propionyloxy] ethyl] -2,4,8,10-tetraoxoxaspiro [5,5] undecane, 1,3,5-trimethyl-2,4 , 6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene and the like. In particular, the phenolic antioxidant preferably has a molecular weight of 550 or more.

  Examples of the thiol antioxidant include distearyl-3,3′-thiodipropionate and pentaerythritol-tetrakis- (β-lauryl-thiopropionate).

  Examples of the phosphite antioxidant include tris (2,4-di-t-butylphenyl) phosphite, distearyl pentaerythritol diphosphite, di (2,6-di-t-butylphenyl) pentaerythritol. Diphosphite, bis- (2,6-di-t-butyl-4-methylphenyl) -pentaerythritol diphosphite, tetrakis (2,4-di-t-butylphenyl) 4,4'-biphenylene-diphosphonite 2,2'-methylenebis (4,6-di-t-butylphenyl) octyl phosphite.

  Moreover, in the resin board protective layer which concerns on this invention, the following light stabilizer can also be used with the said antioxidant.

  Examples of hindered amine light stabilizers include bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, Bis (1,2,2,6,6-pentamethyl-4-piperidyl) -2- (3,5-di-t-butyl-4-hydroxybenzyl) -2-n-butylmalonate, 1-methyl- 8- (1,2,2,6,6-pentamethyl-4-piperidyl) -sebacate, 1- [2- [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionyloxy] ethyl ] -4- [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy] -2,2,6,6-tetramethylpiperidine, 4-benzoyloxy-2,2,6, 6-tetramethyl Piperidine, tetrakis (2,2,6,6-tetramethyl-4-piperidyl) -1,2,3,4-butane-tetracarboxylate, triethylenediamine, 8-acetyl-3-dodecyl-7,7,9 , 9-tetramethyl-1,3,8-triazaspiro [4,5] decane-2,4-dione.

  Other nickel-based UV stabilizers include [2,2′-thiobis (4-t-octylphenolate)]-2-ethylhexylamine nickel (II), nickel complex-3,5-di-t-butyl-4- Hydroxybenzyl phosphate monoethylate, nickel dibutyl-dithiocarbamate and the like can also be used.

  In particular, the hindered amine light stabilizer is preferably a hindered amine light stabilizer containing only a tertiary amine, specifically, bis (1,2,2,6,6-pentamethyl-4-piperidyl). Sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) -2- (3,5-di-t-butyl-4-hydroxybenzyl) -2-n-butylmalonate, or A condensate of 1,2,2,6,6-pentamethyl-4-piperidinol / tridecyl alcohol and 1,2,3,4-butanetetracarboxylic acid is preferred.

[Anchor layer]
In the solar reflective mirror of the present invention, it is preferable to provide an anchor layer between the resin plate and the metal reflective layer from the viewpoint of improving the adhesion between the resin plate and the metal reflective layer.

  The resin used for the anchor layer according to the present invention is not particularly limited as long as it satisfies the conditions of heat resistance and smoothness in addition to the above-mentioned adhesion, and 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, and from the point of weather resistance, a polyester resin and a melamine resin mixed resin are preferable. Furthermore, it is more preferable to use a thermosetting resin mixed with a curing agent such as isocyanate.

  In the present invention, the thickness of the anchor layer is preferably 0.01 to 3 μm, more preferably 0.1 to 1 μm, from the viewpoints of adhesion, smoothness, reflectance of the metal reflection layer, and the like.

  As a method for forming the anchor layer, a conventionally known wet coating method such as a gravure coating method, a reverse coating method, or a die coating method can be used.

(Metal reflective layer)
As the metal reflection layer, for example, silver or a silver alloy, gold, copper, aluminum, or an alloy thereof can be used. In particular, it is preferable to use silver. Such a metal reflective layer serves as a reflective film that reflects light. By making the metal reflective layer a film made of silver or a silver alloy, the reflectance in the visible light region of the mirror can be increased, and the dependence of the reflectance on the incident angle can be reduced. The visible light region means a wavelength region of 400 to 700 nm. The incident angle means an angle with respect to a line perpendicular to the film surface.

  The silver alloy is composed of silver and one or more other metals selected from the group consisting of gold, palladium, tin, gallium, indium, copper, titanium, and bismuth from the viewpoint of improving the durability of the metal reflective layer. Alloys are preferred. As the other metal, gold is particularly preferable from the viewpoint of high temperature humidity resistance and reflectance.

  When the metal reflective layer is a film made of a silver alloy, 90 to 99.8 atomic percent of silver is preferable in the total (100 atomic percent) of silver and other metals in the metal reflective layer. Further, the other metal is preferably 0.2 to 10 atomic% from the viewpoint of durability.

  Moreover, 60-300 nm is preferable and, as for the layer thickness of a metal reflective layer, 80-200 nm is especially preferable. If the thickness of the metal reflective layer is less than 60 nm, the layer thickness is thin and light is transmitted, which may reduce the reflectance in the visible light region of the mirror. If the thickness of the metal reflective layer exceeds 300 nm, irregularities are likely to occur on the surface of the metal reflective layer, which causes light scattering, which may reduce the reflectance in the visible light region.

  The metal reflective layer made of metal can be formed by either a wet method or a dry method. It is preferable to form by wet coating silver and plating, and dry by vapor deposition.

[Formation of metal reflective layer by wet method]
In the solar light reflecting mirror of the present invention, the metal reflective layer is preferably formed by coating and baking a coating solution containing a silver complex compound.

  In the solar reflective mirror of the present invention, as described above, a resin plate with a resin plate protective layer is disposed on the sunlight incident side, and a coating solution containing a silver complex compound is applied thereon by a wet coating method. By applying and baking to form a reflective layer, a reflective surface with extremely smoothness and high regular reflection can be formed.

  The metal reflective layer according to the present invention is not particularly limited as long as it is formed using a coating solution containing a silver complex compound, but as a silver complex compound to be used, for example, shown in JP-T-2009-535661. A silver complex compound obtained by reacting a silver compound represented by the following general formula (1) and at least one selected from the compounds represented by the following general formulas (2) to (4) is used. It is preferable.

(Compounds represented by general formulas (1) to (4))
Hereinafter, the silver compound represented by the following general formula (1) and the ammonium carbamate compound or the ammonium carbonate compound represented by the general formulas (2) to (4) will be described.

General formula (1): Ag _n X

(In the general formulas (1) to (4), X is oxygen, sulfur, halogen, cyano, cyanate, carbonate, nitrate, nitrite, sulfate, phosphate, thiocyanate, chlorate, perchlorate, tetrafluoroborate, acetylacetonate, It is a substituent selected from carboxylate and derivatives thereof, n is an integer of 1 to 4, and R ^{1 to} R ⁶ are independently of each other hydrogen, C1 to C30 aliphatic or fatty acid. These are substituents selected from cyclic alkyl groups, aryl groups or aralkyl groups, alkyl and aryl groups substituted with functional groups, heterocyclic compound groups, polymer compounds and derivatives thereof.
Specific examples of the general formula (1) include, for example, silver oxide, silver thiocyanate, silver sulfide, silver chloride, silver cyanide, silver cyanate, silver carbonate, silver nitrate, silver nitrite, silver sulfate, silver phosphate, perchlorine. Examples include, but are not limited to, acid silver, silver tetrafluoroborate, silver acetylacetonate, silver acetate, silver lactate, silver oxalate and derivatives thereof.

In the general formulas (2) to (4), R ^{1 to} R ⁶ are specifically, for example, hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, amyl, hexyl, ethylhexyl, heptyl, octyl, isooctyl , Nonyl, decyl, dodecyl, hexadecyl, octadecyl, docodecyl, cyclopropyl, cyclopentyl, cyclohexyl, aryl, hydroxy, methoxy, hydroxyethyl, methoxyethyl, 2-hydroxypropyl, methoxypropyl, cyanoethyl, ethoxy, butoxy, hexyloxy, methoxy Ethoxyethyl, methoxyethoxyethoxyethyl, hexamethyleneimine, morpholine, piperidine, piperazine, ethylenediamine, propylenediamine, hexamethylenediamine, triethylenedia , Pyrrole, imidazole, pyridine, carboxymethyl, trimethoxysilylpropyl, triethoxysilylpropyl, phenyl, methoxyphenyl, cyanophenyl, phenoxy, tolyl, benzyl and their derivatives, and polymers such as polyarylamine and polyethyleneamine Examples of the compound and derivatives thereof are not limited thereto.

  Examples of the compounds of the general formulas (2) to (4) include, for example, ammonium carbamate, ammonium carbonate, ammonium bicarbonate, ethylammonium ethylcarbamate, isopropylammonium isopropylcarbamate, n- Butylammonium n-butylcarbamate, isobutylammonium isobutylcarbamate, t-butylammonium t-butylcarbamate, 2-ethylhexylammonium 2-ethylhexylcarbamate, octadecylammonium octadecylcarbamate, 2-methoxyethylammonium 2-methoxyethylcarbamate, 2-si Noethylammonium 2-cyanoethylcarbamate, dibutylammonium dibutylcarbamate, dioctadecylammonium dioctadecylcarbamate, methyldecylammonium methyldecylcarbamate, hexamethyleneimineammonium hexamethyleneiminecarbamate, morpholinium morpholinecarbamate, pyridiumethylhexylcarbamate, triethylenediaminiumisopropyl Bicarbamate, benzylammonium benzylcarbamate, triethoxysilylpropylammonium triethoxysilylpropylcarbamate, ethylammonium ethyl carbonate, isopropylammonium isopropylcarbonate, isopropylammonium bicarbonate, n-butyl Ammonium n-butyl carbonate, isobutylammonium isobutyl carbonate, t-butylammonium t-butyl carbonate, t-butylammonium bicarbonate, 2-ethylhexylammonium 2-ethylhexylcarbonate, 2-ethylhexylammonium bicarbonate, 2-methoxyethylammonium 2- Methoxyethyl carbonate, 2-methoxyethylammonium bicarbonate, 2-cyanoethylammonium 2-cyanoethyl carbonate, 2-cyanoethylammonium bicarbonate, octadecylammonium octadecylcarbonate, dibutylammonium dibutylcarbonate, dioctadecylammonium dioctadecylcarbonate, dioctade Silammonium bicarbonate, methyldecylammonium methyldecylcarbonate, hexamethyleneimineammonium hexamethyleneiminecarbonate, morpholineammonium morpholinecarbonate, benzylammonium benzylcarbonate, triethoxysilylpropylammonium triethoxysilylpropylcarbonate, pyridium bicarbonate, triethylenediaminium Examples thereof include, but are not limited to, one or a mixture of two or more selected from isopropyl carbonate, triethylenediaminium bicarbonate, and derivatives thereof.

  On the other hand, the kind and production method of the above-mentioned ammonium carbamate or ammonium carbonate compound need not be particularly limited. For example, US Pat. No. 4,542,214 describes that ammonium carbamate compounds can be prepared from carbon dioxide and primary amines, secondary amines, tertiary amines, or at least one of these mixtures. When 0.5 mol of water is further added per 1 mol of the amine, an ammonium carbonate compound is obtained. When 1 mol or more of water is added, an ammonium bicarbonate compound can be obtained. At this time, it is produced directly without using a special solvent at normal pressure or under pressure, or when a solvent is used, alcohols such as water, methanol, ethanol, isopropanol, butanol, ethylene glycol, glycerin, etc. Glycols, ethyl acetate, butyl acetate, acetates such as carbitol acetate, ethers such as diethyl ether, tetrahydrofuran, dioxane, ketones such as methyl ethyl ketone, acetone, hydrocarbons such as hexane, heptane, Examples include aromatics such as benzene and toluene, and halogen-substituted solvents such as chloroform, methylene chloride, and carbon tetrachloride, or mixed solvents thereof. Is carbon dioxide bubbled in the gas phase? To be able to use the solid phase dry ice, it can be reacted in supercritical (supercritical) state. For the production of the ammonium carbamate or ammonium carbonate derivative used in the present invention, any known method other than the above method may be used as long as the structure of the final substance is the same. That is, it is not necessary to specifically limit the solvent, reaction temperature, concentration or catalyst for production, and the production yield is not affected.

  An organic silver complex compound can be produced by reacting the thus produced ammonium carbamate or ammonium carbonate compound with a silver compound. For example, at least one silver compound represented by the general formula (1), at least one ammonium carbamate or ammonium carbonate derivative represented by the general formulas (2) to (4), and a mixture thereof. In a nitrogen atmosphere at normal pressure or under pressure without using a solvent, or when using a solvent, alcohols such as water, methanol, ethanol, isopropanol, butanol, ethylene glycol, glycerin Glycols such as ethyl acetate, butyl acetate, acetates such as carbitol acetate, ethers such as diethyl ether, tetrahydrofuran and dioxane, ketones such as methyl ethyl ketone and acetone, hydrocarbons such as hexane and heptane Of benzene, toluene Aromatic UNA, and chloroform and methylene chloride, and halogen-substituted solvents or a mixed solvent such as carbon tetrachloride can be used.

  For the production of the silver complex compound used in the present invention, in addition to the above method, after preparing a solution in which the silver compound of the general formula (1) and one or more amine compounds are mixed, carbon dioxide is used. A silver complex compound can also be produced by reaction. As described above, the reaction can be performed directly without using a solvent in a normal pressure or pressurized state of a nitrogen atmosphere, or can be performed using a solvent. However, any known method may be used as long as the structure of the final material is the same. That is, it is not necessary to specifically limit the solvent for the production, the reaction temperature, the concentration, the presence or absence of the catalyst, and the production yield is not affected.

  The production method of the silver complex compound used in the present invention is described in JP-T-2008-530001, and is recognized by the structure of the following general formula (5).

General formula (5): Ag [A] _m
(In General formula (5), A is a compound of General formula (2)-(4), and m is 0.5-1.5.)
The coating liquid for forming a silver reflection layer used for forming a highly reflective and highly glossy silver reflection layer according to the present invention contains the silver complex compound according to the present invention, and if necessary, a solvent, A stabilizer, a leveling agent, an additive for a thin film auxiliary agent, a reducing agent, and a thermal decomposition reaction accelerator can be contained in the coating solution for forming a silver reflective layer according to the present invention.

  Additives such as auxiliary agents, reducing agents, and thermal decomposition reaction accelerators can be contained in the silver coating composition according to the present invention.

  Examples of the stabilizer that can be used in the coating liquid for forming a metal reflection layer include, for example, amine compounds such as primary amine, secondary amine, and tertiary amine, ammonium carbamate, ammonium carbonate, ammonium bicarbonate compound, Or a phosphorus compound such as phosphine, phosphite, phosphate, a sulfur compound such as thiol or sulfide, and at least one of these mixtures, and an amine. Specific examples of the compound include methylamine, ethylamine, n-propylamine, isopropylamine, n-butylamine, isobutylamine, isoamylamine, n-hexylamine, 2-ethylhexylamine. N-heptylamine, n-octylamine, isooctylamine, nonylamine, decylamine, dodecylamine, hexadecylamine, octadecylamine, docodecylamine, cyclopropylamine, cyclopentylamine, cyclohexylamine, arylamine, hydroxyamine, Ammonium hydroxide, methoxyamine, 2-ethanolamine, methoxyethylamine, 2-hydroxypropylamine, 2-hydroxy-2-methylpropylamine, methoxypropylamine, cyanoethylamine, ethoxyamine, n-butoxyamine, 2-hexyloxy Amine, methoxyethoxyethylamine, methoxyethoxyethoxyethylamine, dimethylamine, dipropylamine, diethanolamine, hexamethyle Imine, morpholine, piperidine, piperazine, ethylenediamine, propylenediamine, hexamethylenediamine, triethylenediamine, 2,2- (ethylenedioxy) bisethylamine, triethylamine, triethanolamine, pyrrole, imidazole, pyridine, aminoacetaldehyde dimethyl acetal, Such as 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, aniline, anisidine, aminobenzonitrile, benzylamine and its derivatives, and polymer compounds such as polyarylamine and polyethyleneimine and their derivatives An amine compound is mentioned.

  Specific examples of ammonium carbamate, carbonate, and bicarbonate-based compounds include, for example, ammonium carbamate, ammonium carbonate, ammonium bicarbonate, ethylammonium ethylcarbamate, isopropylammonium isopropylcarbamate, and n-butyl. Ammonium n-butyl carbamate, isobutyl ammonium isobutyl carbamate, t-butyl ammonium t-butyl carbamate, 2-ethylhexyl ammonium 2-ethylhexyl carbamate, octadecyl ammonium octadecyl carbamate, 2-methoxyethyl ammonium 2-methoxyethyl carbamate, 2-cyanoethylammonium 2-cyanoethylcarbamate, dibutylammonium dibutylcarbamate, dioctadecylammonium dioctadecylcarbamate, methyldecylammonium methyldecylcarbamate, hexamethyleneimineammonium hexamethyleneiminecarbamate, morpholinium morpholinecarbamate, pyridiumethylhexyl Carbamate, triethylenediaminium isopropyl bicarbamate, benzylammonium benzylcarbamate, triethoxysilylpropylammonium triethoxysilylpropylcarbamate, ethylammonium ethyl carbonate, isopropylammonium isopropyl carbonate, isopropyl Ruammonium bicarbonate, n-butylammonium n-butylcarbonate, isobutylammonium isobutylcarbonate, t-butylammonium t-butylcarbonate, t-butylammonium bicarbonate, 2-ethylhexylammonium 2-ethylhexylcarbonate, 2-ethylhexylammonium bicarbonate 2-methoxyethylammonium 2-methoxyethyl carbonate, 2-methoxyethylammonium bicarbonate, 2-cyanoethylammonium 2-cyanoethyl carbonate, 2-cyanoethylammonium bicarbonate, octadecylammonium octadecylcarbonate, dibutylammonium dibutylcarbonate, dioctadecylammoni Dioctadecyl carbonate, dioctadecyl ammonium bicarbonate, methyl decyl ammonium methyl decyl carbonate, hexamethylene imine ammonium hexamethylene imine carbonate, morpholine ammonium morpholine carbonate, benzyl ammonium benzyl carbonate, triethoxysilylpropyl ammonium triethoxysilylpropyl carbonate, pyridium bi Examples thereof include carbonate, triethylenediaminium isopropyl carbonate, triethylenediaminium bicarbonate, and derivatives thereof.

As the phosphorus compound, as a general _formula, R 3 P, include a phosphorus compound represented by _{(RO) 3} P or _(RO) 3 PO. Here, R represents an alkyl or aryl group having 1 to 20 carbon atoms, and specific examples include tributylphosphine, triphenylphosphine, triethyl phosphite, triphenyl phosphite, dibenzyl phosphate, triethyl phosphate and the like.

  Specific examples of the sulfur compound include butanethiol, n-hexanethiol, diethyl sulfide, tetrahydrothiophene, aryl disulfide, 2-mercaptobenzoazole, tetrahydrothiophene, and octylthioglycolate.

  The amount of such a stabilizer used is not particularly limited. However, the content is preferably 0.1% to 90% in terms of molar ratio with respect to the silver compound.

  Moreover, as a thin film adjuvant which can be used for the coating liquid for metal reflective layer formation, an organic acid and an organic acid derivative, or at least 1 or more mixture thereof is mentioned. Specifically, for example, acetic acid, butyric acid (valeric acid), pivalic acid (pivalic acid), hexanoic acid, octanoic acid, 2-ethyl-hexanoic acid, neodecanoic acid, lauric acid ( Lauric acid), stearic acid, naphthalic acid, and the like. Specific examples of organic acid derivatives include ammonium acetate, ammonium citrate, ammonium laurate, ammonium lactate, and ammonium maleate. Organic acid ammonium salts such as ammonium oxalate and ammonium molybdate, Au, Cu, Zn, Ni, Co, Pd, Pt, Ti, V, Mn, Fe, Cr, Zr, Nb, Mo, W, Ru, Cd, Ta, Re, Os, Manganese oxalate, gold acetate, palladium oxalate, silver 2-ethylhexanoate containing metals such as Ir, Al, Ga, Ge, In, Sn, Sb, Pb, Bi, Sm, Eu, Ac, Th, Examples thereof include organic acid metal salts such as silver octanoate, silver neodecanoate, cobalt stearate, nickel naphthalate, and cobalt naphthalate. Although the usage-amount of the said thin film adjuvant is not specifically limited, 0.1-25% is preferable by molar ratio with respect to a silver complex compound.

  Examples of the reducing agent that can be used in the coating solution for forming the metal reflective layer include Lewis acid or weak Bronsted acid. Specific examples thereof include hydrazine, hydrazine monohydrate, acetohydrazide, and boron hydroxide. Amine compounds such as sodium or potassium borohydride, dimethylamine borane and butylamine borane, metal salts such as ferrous chloride and iron lactate, hydrogen, hydrogen iodide, carbon monoxide, formaldehyde, acetaldehyde, glyoxal Examples thereof include aldehyde compounds, formic acid compounds such as methyl formate, butyl formate, and triethyl-o-formic acid, and mixtures thereof containing at least one reducing organic compound such as glucose, ascorbic acid, and hydroquinone.

  Specific examples of the thermal decomposition reaction accelerator that can be used in the coating solution for forming a metal reflection layer include ethanolamine, methyldiethanolamine, triethanolamine, propanolamine, butanolamine, hexanolamine, and dimethylethanolamine. Hydroxyalkylamines, piperidine, N-methylpiperidine, piperazine, N, N'-dimethylpiperazine, 1-amino-4methylpiperazine, pyrrolidine, N-methylpyrrolidine, amine compounds such as morpholine, acetone oxime, dimethylglyoxime Alkyl oximes such as 2-butanone oxime, 2,3-butadione monooxime, glycols such as ethylene glycol, diethylene glycol and triethylene glycol, methoxyethyl amino , Alkoxyalkylamines such as ethoxyethylamine and methoxypropylamine, alkoxyalkanols such as methoxyethanol, methoxypropanol and ethoxyethanol, ketones such as acetone, methylethylketone and methylisobutylketone, acetol and diacetone alcohol Examples thereof include ketone alcohols, polyhydric phenol compounds, phenol resins, alkyd resins, pyrroles, and oxidatively polymerizable resins such as ethylenedioxythiophene (EDOT).

  In addition, a solvent may be required for adjusting the viscosity of the coating liquid for forming the metal reflection layer and for forming a smooth thin film. Examples of the solvent that can be used in this case include water, methanol, ethanol, isopropanol, 1-methoxypropanol, Alcohols such as butanol, ethylhexyl alcohol and terpineol, glycols such as ethylene glycol and glycerol, ethyl acetate, butyl acetate, methoxypropyl acetate, carbitol acetate, acetates such as ethyl carbitol acetate, methyl cellosolve, butyl cellosolve , Ethers such as diethyl ether, tetrahydrofuran, dioxane, methyl ethyl ketone, acetone, dimethylformamide, ketones such as 1-methyl-2-pyrrolidone, hexane, Hydrocarbons such as tan, dodecane, paraffin oil, mineral spirits, aromatics such as benzene, toluene, xylene, and halogen-substituted solvents such as chloroform, methylene chloride, carbon tetrachloride, acetonitrile, dimethyl sulfoxide, or these Or a mixed solvent thereof can be used.

  Next, a method for forming a metal reflection layer according to the present invention using a metal reflection layer forming coating solution will be described.

  In the present invention, a coating method applied to form a metal reflective layer by applying a metal reflective layer coating solution containing the silver complex compound according to the present invention on a resin plate is particularly a wet coating method. There are no restrictions, for example, spin coating, dip coating, extrusion coating, roll coating coating, spray coating, gravure coating, wire bar coating, air knife coating, slide popper coating, curtain coating, screen printing method, inkjet printing method, etc. A coating method using a known solution can be appropriately selected and used.

  In accordance with the above method, after forming a metal reflective layer on the resin plate, a baking process is performed to form a reflective mirror surface.

  The calcination treatment can also be performed by heat treatment in a normal inert atmosphere, but if necessary, in air, nitrogen, carbon monoxide, or between hydrogen gas and air or other inert gas. Treatment with a mixed gas is also possible. The heat treatment is usually in the range of 80 to 200 ° C., preferably 90 to 170 ° C., more preferably 100 to 150 ° C., although it depends on the constituent material of the resin plate to be applied. In addition, a method of performing heat treatment in two or more stages of low temperature and high temperature within the above temperature range is preferable from the viewpoint of the uniformity of the reflective film. For example, after performing the process for 1 to 30 minutes at 80-150 degreeC, it can process for 1-30 minutes at 150-200 degreeC.

(Metal corrosion prevention layer)
The solar reflective mirror of the present invention is characterized by having a metal corrosion prevention layer on the surface of the metal reflective layer.

  The metal corrosion prevention layer contains a corrosion inhibitor and prevents corrosion deterioration of the metal forming the metal reflection layer, for example, silver.

  As a resin that can be used for forming the metal corrosion prevention layer, a polyester resin, an acrylic resin, a melamine resin, an epoxy resin, etc. can be used alone or a mixed resin thereof. From the viewpoint of weather resistance, a polyester resin An acrylic resin is preferable, and a thermosetting resin mixed with a curing agent such as isocyanate is more preferable.

  As the isocyanate, various conventionally used isocyanates such as TDI (tolylene diisocyanate), XDI (xylene diisocyanate), MDI (methylene diisocyanate), and HMDI (hexamethylene diisocyanate) can be used. From the viewpoint of properties, XDI, MDI, and HMDI isocyanates are preferably used.

  The thickness of the metal corrosion prevention layer is preferably from 0.01 to 3 μm, more preferably from 0.1 to 1 μm, from the viewpoints of adhesion, weather resistance and the like.

  As a method for forming the metal corrosion prevention layer, conventionally known coating methods such as a gravure coating method, a reverse coating method, and a die coating method can be used.

  As the corrosion inhibitor for the metal reflection layer contained in the metal corrosion prevention layer according to the present invention, a corrosion inhibitor and an antioxidant having an adsorptive group for silver are preferably used. Here, “corrosion” refers to a phenomenon in which a metal (silver) is chemically or electrochemically eroded or deteriorated by an environmental material surrounding it (see JIS Z0103-2004).

  In the mirror according to the present invention, an embodiment in which the undercoat layer contains an antioxidant and the metal corrosion prevention layer contains a corrosion inhibitor having an adsorptive group for silver is also preferable.

The content of the corrosion inhibitor varies depending on the compound used, but is generally preferably in the range of 0.1 to 1.0 g / m ² .

<Corrosion inhibitor having an adsorptive group for silver>
Corrosion inhibitors having an adsorptive group for silver applicable to the present invention include amines and derivatives thereof, compounds having a pyrrole ring, compounds having a triazole ring, compounds having a pyrazole ring, compounds having a thiazole ring, imidazole It is desirable to be selected from a compound having a ring, 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.

  Examples of amines and derivatives thereof include ethylamine, laurylamine, tri-n-butylamine, o-toluidine, diphenylamine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, monoethanolamine, diethanolamine, triethanolamine, 2-N-dimethylethanolamine, 2-amino-2-methyl-1,3-propanediol, acetamide, acrylamide, benzamide, p-ethoxychrysidine, dicyclohexylammonium nitrite, dicyclohexylammonium salicylate, monoethanolamine benzoate, dicyclohexyl Ammonium benzoate, diisopropylammonium benzoate, diisopropylammonium nai Light, cyclohexylamine carbamate, nitronaphthalene nitrite, cyclohexylamine benzoate, dicyclohexylammonium cyclohexanecarboxylate, cyclohexylamine cyclohexane carboxylate, dicyclohexylammonium acrylate, cyclohexylamine acrylate, or mixtures thereof.

  Examples of the compound having a pyrrole ring include N-butyl-2,5-dimethylpyrrole, N-phenyl-2,5-dimethylpyrrole, N-phenyl-3-formyl-2,5-dimethylpyrrole, and N-phenyl. -3,4-diformyl-2,5-dimethylpyrrole, etc., or a mixture thereof.

  Examples of the compound having a triazole ring include 1,2,3-triazole, 1,2,4-triazole, 3-mercapto-1,2,4-triazole, 3-hydroxy-1,2,4-triazole, 3-methyl-1,2,4-triazole, 1-methyl-1,2,4-triazole, 1-methyl-3-mercapto-1,2,4-triazole, 4-methyl-1,2,3- Triazole, benzotriazole, tolyltriazole, 1-hydroxybenzotriazole, 4,5,6,7-tetrahydrotriazole, 3-amino-1,2,4-triazole, 3-amino-5-methyl-1,2, 4-triazole, carboxybenzotriazole, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'- Loxy-5'-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'-di-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-4-octoxyphenyl) ) Benzotriazole and the like, or a mixture thereof.

  Examples of the compound having a pyrazole ring include pyrazole, pyrazoline, pyrazolone, pyrazolidine, pyrazolidone, 3,5-dimethylpyrazole, 3-methyl-5-hydroxypyrazole, 4-aminopyrazole, and a mixture thereof.

  Examples of the compound having a thiazole ring include thiazole, thiazoline, thiazolone, thiazolidine, thiazolidone, isothiazole, benzothiazole, 2-N, N-diethylthiobenzothiazole, P-dimethylaminobenzallodanine, and 2-mercaptobenzo. Examples include thiazole and the like, or a mixture thereof.

  Examples of the compound having an imidazole ring include imidazole, histidine, 2-heptadecylimidazole, 2-methylimidazole, 2-ethyl-4-methylimidazole, 2-phenylimidazole, 2-undecylimidazole, and 1-benzyl-2. -Methylimidazole, 2-phenyl-4-methylimidazole, 1-cyanoethyl-2-methylimidazole, 1-cyanoethyl-2-phenylimidazole, 1-cyanoethyl-2-ethyl-4-methylimidazole, 1-cyanoethyl-2- Undecylimidazole, 2-phenyl-4-methyl-5-hydromethylimidazole, 2-phenyl-4,5-dihydroxymethylimidazole, 4-formylimidazole, 2-methyl-4-formylimidazole, 2-pheny -4-formylimidazole, 4-methyl-5-formylimidazole, 2-ethyl-4-methyl-5-formylimidazole, 2-phenyl-4-methyl-4-formylimidazole, 2-mercaptobenzimidazole Or a mixture thereof.

  Examples of the compound having an indazole ring include 4-chloroindazole, 4-nitroindazole, 5-nitroindazole, 4-chloro-5-nitroindazole, and a mixture thereof.

  Examples of the copper chelate compounds include acetylacetone copper, ethylenediamine copper, phthalocyanine copper, ethylenediaminetetraacetate copper, hydroxyquinoline copper, and a mixture thereof.

  Examples of thioureas include thiourea, guanylthiourea, and the like, or a mixture thereof.

  As the compound having a mercapto group, mercaptoacetic acid, thiophenol, 1,2-ethanediol, 3-mercapto-1,2,4-triazole, 1-methyl-3-mercapto can be used by adding the above-described materials. -1,2,4-triazole, 2-mercaptobenzothiazole, 2-mercaptobenzimidazole, glycol dimercaptoacetate, 3-mercaptopropyltrimethoxysilane, and the like, or a mixture thereof.

  Examples of the naphthalene type include thionalide.

  Antioxidants and stabilizers can also be used as the corrosion inhibitor for the metal reflection layer used in the metal corrosion prevention layer according to the present invention. Examples of the antioxidant and stabilizer include the same antioxidants and stabilizers that can be applied to the polymers described above.

[Other components]
In the solar reflective mirror of the present invention, the following functional layers may be formed as necessary.

(Scratch-resistant easy-slip layer)
In the solar light reflecting mirror of the present invention, a scratch-resistant easy-sliding layer can be provided as the outermost layer of the mirror. This scratch-resistant easy-slip layer is provided for preventing scratches.

  The scratch-resistant easy-slip layer can be composed of an acrylic resin, a urethane resin, a melamine resin, an epoxy resin, an organic silicate compound, a silicone resin, or the like. In particular, silicone resins and acrylic resins are preferable in terms of hardness and durability. Furthermore, what consists of an active energy ray-curable acrylic resin or a thermosetting acrylic resin is preferable at the point of sclerosis | hardenability, flexibility, and productivity.

  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. In addition, you may use what contains a photoinitiator, a photosensitizer, a thermal-polymerization initiator, a modifier, etc. as needed.

  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. A structure in which an acrylic group is bonded to a simple skeleton can also be used.

  In addition, 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.

  Commercially available multifunctional acrylic paints include Mitsubishi Rayon Co., Ltd. (trade name “Diabeam” series, etc.), Nagase Sangyo Co., Ltd. (trade name “Denacol” series, etc.), Shin-Nakamura Co., Ltd. ( (Product name “NK Ester” series, etc.), DIC Corporation; (Product name “UNIDIC” series, etc.), Toagosei Co., Ltd. (Product name “Aronix” series, etc.), Nippon Oil and Fats Corporation; (Such as “series”), Nippon Kayaku Co., Ltd .; (trade name “KAYARAD” series, etc.), Kyoeisha Chemical Co., Ltd. (trade names “light ester” series, “light acrylate” series, etc.) it can.

  In the present invention, various additives can be further blended into the scratch-resistant easy-sliding layer as required, as long as the effects of the present invention are not impaired. For example, stabilizers such as antioxidants, light stabilizers, ultraviolet absorbers, surfactants, leveling agents, antistatic agents, and the like can be used.

  The leveling agent is particularly effective in reducing surface irregularities when a scratch-resistant easy-slip layer is applied. As a leveling agent, for example, a dimethylpolysiloxane-polyoxyalkylene copolymer (for example, SH190 manufactured by Toray Dow Corning Co., Ltd.) is suitable as a silicone leveling agent.

(Sacrificial protection layer)
A sacrificial anticorrosive layer can be provided on the solar reflective mirror of the present invention. The sacrificial anticorrosive layer as used in the present invention is a layer that protects the metal reflective layer made of metal by sacrificial anticorrosion, and the metal reflective layer made of metal is disposed by arranging the sacrificial anticorrosive layer on the back surface of the metal reflective layer. The corrosion resistance of the layer can be improved. In the present invention, the sacrificial anticorrosive layer is preferably copper having a higher ionization tendency than silver, and the sacrificial anticorrosive layer made of copper suppresses silver deterioration by being provided under the metal reflective layer composed of silver. Can do.

<Reflector for solar power generation>
Next, a solar power generation reflecting device to which the solar light reflecting mirror of the present invention is applied will be described.

  The solar power generation reflecting device of the present invention is formed by fixing a solar light reflecting mirror to a holding member, for example, a metal member such as an aluminum frame.

(Holding member)
In the reflector for solar power generation of the present invention, it is preferable to use a metal frame as the holding member, for example, a steel plate, a copper plate, an aluminum plate, an aluminum plated steel plate, an aluminum alloy plated steel plate, a copper plated steel plate, a tin plated steel plate, chromium. A metal material having a high thermal conductivity such as a plated steel plate or a stainless steel plate can be used. In the present invention, it is particularly preferable to use a plated steel plate, stainless steel plate, aluminum plate or the like having good corrosion resistance.

(Reflector for solar thermal power generation)
The solar power generation reflecting device of the present invention can be applied as a solar power generation mirror for collecting sunlight. When used as a solar power generation reflecting device, the reflecting device is shaped like a bowl (semi-cylindrical), and a cylindrical member having fluid inside is provided at the center of the semicircle, and sunlight is condensed on the cylindrical member. The form which heats an internal fluid by this, converts the heat energy, and generates electric power is mentioned as one form. In addition, flat reflectors were installed at multiple locations, and the sunlight reflected by each reflector was collected on one reflector (central reflector) and reflected by the reflector. The form which generate | occur | produces electricity by converting a thermal energy in a power generation part is also mentioned as one form. In particular, in the latter form, since a high regular reflectance is required for the reflection device used, the reflection device for solar power generation of the present invention is particularly preferably used.

  EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto. In addition, although the display of "part" or "%" is used in an Example, unless otherwise indicated, "part by mass" or "mass%" is represented.

Example 1
<Production of mirrors for sunlight reflection>
(Preparation of mirror 1)
A glass plate (thickness 3 mm) was used as a substrate for forming the reflective surface. After the surface of the glass plate was washed to remove oils and fats, a silver reflection layer was formed by a spray-type silver mirror reaction. An ethyl acetate solution of methyl acrylate: butyl acrylate copolymer (ratio 64:36, thermosetting resin) containing a benzotriazole-based corrosion inhibitor was coated on the silver reflective layer by gravure coating, and at 80 ° C. for 4 minutes. It dried and produced the mirror 1 of the comparative example.

(Preparation of mirror 2)
Biaxially stretched polyester (polyethylene terephthalate, thickness 25 μm) was used as the resin substrate. On this one side, a silver reflective layer having a thickness of 80 nm was formed as a silver reflective layer by vacuum deposition. An acrylic adhesive Sdyne # 7851 (manufactured by Sekisui Chemical Co., Ltd.) was applied to the thickness of 15 μm on the silver reflective layer side of the resin substrate to form an adhesive layer, and a polyester release film was laminated. Acrylic pressure-sensitive adhesive Sdyne # 7851 (manufactured by Sekisui Chemical Co., Ltd.) is applied as an adhesive to a thickness of 10 μm to form an adhesive layer, and then an acrylic film 75 μm (Mitsubishi Rayon HBA006) containing an ultraviolet absorber is nip-rolled to the adhesive layer A film mirror was produced by pasting under conditions of a temperature of 80 ° C. and a nip roll pressure of 2 MPa. Since the shape cannot be maintained only with the thin mirror 2, the mirror 2 of the comparative example was fabricated by separately attaching to a 3 mm aluminum plate.

(Preparation of mirror 3)
An acrylic urethane resin was applied onto the surface of an electrogalvanized steel sheet having a thickness of 0.5 mm (double-sided plating, Zn plating amount on one side: 20 g / m 2) so that the film thickness after drying was 1 μm and dried. A silver reflective layer having a thickness of 80 nm was formed by silver mirror reaction. An acrylic resin was applied to the surface of the silver reflective layer so as to have a dry film thickness of 6 μm, and then a silica sol aqueous solution was applied to form a 0.05 μm silica film to produce a comparative mirror 3.

(Preparation of mirror 4)
As a resin substrate, a transparent acrylic resin substrate (methacrylic resin PMMA) of 1 m square and 3 mm was prepared.

  Acrylic-modified silicone trade name: 10-22 g of X-22-2426 (manufactured by Shin-Etsu Chemical Co., Ltd.), 1 L of organic solvent (xylene 5 mass%, 2-butanol 25 mass%, ethyl acetate 25 mass%, ethanol 45 mass%) The mixture was stirred well to produce a uniform acrylic-modified silicone-containing solution.

  After the acrylic resin substrate was immersed in the acrylic-modified silicone-containing solution, the substrate was pulled up at a speed of 7 cm per minute using a pulling device using a synchronous motor in order to make the coated surface uniform. The pulled acrylic resin substrate was heat-treated at 60 ° C. for 1 hour in a constant temperature dryer, and the acrylic resin substrate was coated on the acrylic resin substrate.

(Silver plating)
An ammonia-excess ammoniacal silver nitrate aqueous solution containing 34 g / L of AgNO ₃ was prepared (hereinafter referred to as “A solution”).

  A solution of sodium hydroxide aqueous solution of NaOH 20 g / L was prepared (hereinafter referred to as B solution).

A solution of glucose aqueous solution of C ₆ H ₁₂ O ₆ 15 g / L was prepared (hereinafter referred to as “C solution”).

  Here, the preparation method of A liquid is demonstrated.

  When 28 ml / L of concentrated aqueous ammonia (28%) is gradually added to a 34 g / L silver nitrate aqueous solution, the precipitate once disappears and then disappears again. Next, 28 ml / L of concentrated aqueous ammonia (28%) is further added to the solution. Eventually, 56 ml / L of concentrated aqueous ammonia (28%) is added to the original aqueous silver nitrate solution to make Liquid A.

  A liquid, B liquid, and C liquid shall be 15 degreeC or more room temperature, and it mixes in the ratio of 1: 1: 1, respectively, and is set as a liquid mixture. The mixed solution (silver plating solution) immediately after the mixing is placed on the upper surface of the acrylic resin substrate coated with the above-mentioned acrylic-modified silicone and left to stand. The mixed solution (silver plating solution) spreads uniformly without being repelled on the top surface of the acrylic resin substrate by the action of the acrylic-modified silicone layer, and a uniform silver mirror (silver thin film layer) is formed on the acrylic resin substrate surface by a silver mirror reaction.

  In order to protect the silver thin film layer formed on the surface of the acrylic resin substrate, a copper protective film is formed on it with a copper sulfate (II) aqueous solution and a reducing agent solution (zinc powder suspension), and then a backing coating is applied. Then, a mirror 4 of a comparative example was produced.

(Preparation of mirror 5)
A 1 mm square PMMA plate (manufactured by Mitsubishi Rayon, thickness 3 mm) was used as the resin plate. After washing the surface of the resin plate and removing oils and fats, one side was coated with polysilazane dispersed in a solvent and cured in an environment of 60 ° C. for 3 hours to form a coating type barrier layer. An anchor layer made of isocyanate was coated on a surface without a coating type barrier by a blade coater and dried at 80 ° C. for 1 minute. A silver reflective layer having a thickness of 80 nm was formed as a silver reflective layer on the anchor layer by vacuum deposition. An ethyl acetate solution of methyl acrylate: butyl acrylate copolymer (ratio 64:36, thermosetting resin) containing a benzotriazole-based corrosion inhibitor was coated on the silver reflective layer by gravure coating, and at 80 ° C. for 4 minutes. It dried and formed the metal corrosion prevention layer, and produced the mirror 5 of this invention.

(Preparation of mirror 6)
A 1 m square polycarbonate plate (Mitsubishi Gas Chemical Co., Ltd., thickness: 3 mm) was used as the resin plate. The resin plate surface was washed to remove oils and fats, etc., and then an isocyanate anchor layer was applied to one side by a blade coater and dried at 80 ° C. for 1 minute. A silver reflective layer having a thickness of 80 nm was formed as a silver reflective layer on the anchor layer by vacuum deposition. An ethyl acetate solution of methyl acrylate: butyl acrylate copolymer (ratio 64:36, thermosetting resin) containing a benzotriazole-based corrosion inhibitor was coated on the silver reflective layer by gravure coating, and at 80 ° C. for 4 minutes. It dried and formed the metal corrosion prevention layer. Toluene solution in which 3% by mass of triazine-based ultraviolet absorber (TINUVIN 1577 made by BASF) is mixed with methyl acrylate: butyl acrylate copolymer (ratio 64:36, thermosetting resin) on the surface opposite to the silver reflection layer forming surface Was coated by a gravure coating method and dried at 80 ° C. for 30 seconds to form a resin plate protective layer containing an ultraviolet absorber to produce the mirror 6 of the present invention.

(Preparation of mirror 7)
A 1 m square polyethylene terephthalate plate (Mitsubishi Resin, thickness 3 mm) was used as the resin plate. After cleaning the surface of the resin plate and removing oils and fats, etc., a silicon oxide layer with a thickness of 64 nm and a titanium oxide layer with a thickness of 35 nm are alternately vacuum-deposited on one side to form a four-layer gas barrier layer and UV reflective layer. Layers were deposited. Other than that, the mirror 7 of the present invention was manufactured by the same manufacturing method as the mirror 6.

(Preparation of gas barrier measurement sample)
As a gas barrier measuring device, the water vapor transmission rate used was a water vapor transmission rate measuring device PERMATRAN-W3-33 manufactured by MOCON. The oxygen permeability was measured with an oxygen permeability measuring device OXTRAN-2-21 manufactured by MOCON. In order to match the thickness with the measuring device, the thickness of the material constituting the layer disposed on the surface layer on the sunlight side of the mirror 1 to the mirror 7 was unified to 0.5 mm. When the water vapor permeability and the oxygen permeability were measured, the results shown in Table 2 were obtained.

<Evaluation of mirror>
[Measurement of initial spot diameter]
About the produced said mirror, the spot diameter of the reflective spot was measured using the small working autocollimator WV-60 by Nikon Engineering. When the spot has a circular shape with an effective observation area of 28 mm in diameter and the mirror surface has flatness and high reflection efficiency, the same spot diameter as the diameter of the light beam incident on the mirror is obtained on the monitor through the CCD sensor. Therefore, the closer the initial spot diameter is to 28 mm, the better the reflection efficiency.

[Initial 5 degree specular reflectance measurement]
The 5 degree regular reflectance in the sunlight incident surface side of the produced mirror was measured. Using Hitachi spectrophotometer U-4100 (solid sample measurement system), relative reflectance measurement with respect to a reference sample having an incident angle of 5 degrees was performed. The wavelength range was measured at 250 to 2500 nm, and it was confirmed whether there was any wavelength range in which the reflectance dropped partially. The reflectance in the visible light region (400 to 800 nm) was averaged, and this was defined as a regular reflectance of 5 degrees.

[Evaluation of weather resistance]
The mirror thus produced was allowed to stand for 30 days in an environment of a temperature of 85 ° C. and a relative humidity of 85%, and then irradiated with a xenon lamp (with a suga tester SX75, radiation intensity of 180 W / m ² 500 hours). Subsequently, the regular reflectance of 5 degrees was measured by the same method as described above after irradiation with the xenon lamp. With respect to the initial spot diameter and the initial 5 degree regular reflectance, the smaller the fluctuation range, the better the weather resistance.

[Mass evaluation]
A 1 m ² mirror was placed on a stainless steel scale (maximum weighing 30 kg), and the mass was measured.

[In-plane foreign matter, flatness evaluation]
The produced mirror was cut into a 150 mm square so as to enter the measuring apparatus. If it is placed on a Fizeau normal incidence interferometer (MSP150, manufactured by Tropel Co., Ltd.) and the height difference within the 150 mm square range is less than 10 μm, it is ◯ when it is 10 μm or more and less than 100 μm, and × when there is a height difference of 100 μm or more It was determined.

  As is apparent from the results shown in Table 1, it can be seen that the mirror of the present invention has excellent specular reflectivity, light weight, flatness and excellent weather resistance with respect to the comparative example.

  As is apparent from the results shown in Table 2, it can be seen that the mirror of the present invention has a gas barrier property and excellent weather resistance compared to the comparative example.

Example 2
《Preparation of solar power reflectors》
Each of the produced mirrors was installed as a holding member on an aluminum frame to produce a solar power generation reflection device. The mirror 3 using a 0.5 mm thick steel plate was bent at a wind speed of 15 m / s. Other mirrors did not deform such as deflection.

<< Evaluation of Reflector for Solar Power Generation >>
As a result of confirming the regular reflection property, scratch resistance, weather resistance, and durability under various temperature and humidity environments in the same manner as the method described in Example 1 for the thus produced solar power generation reflection device, the present invention. It was confirmed that the solar power generation reflection device using the mirror can obtain good results with respect to the comparative example.

  Since this invention is comprised as mentioned above, it can utilize as a solar power generation reflective apparatus using the mirror for sunlight reflection and the mirror for sunlight reflection.

DESCRIPTION OF SYMBOLS 1 Mirror for sunlight reflection 2 Resin board protective layer 3 Resin board 4 Anchor layer 5 Metal reflective layer 6 Metal corrosion prevention layer

Claims (6)

  In order from the side on which sunlight enters, a solar reflective mirror having a resin plate protective layer, a resin plate, a metal reflective layer, and a metal corrosion prevention layer, wherein the resin plate protective layer is inorganic oxide A solar reflective mirror, which is at least one of a film layer or a curable resin film layer containing an ultraviolet absorber.   2. The solar reflective mirror according to claim 1, wherein the resin plate contains a resin selected from a resin group consisting of a methacrylic resin, a polycarbonate resin, and a polyethylene terephthalate resin.   The solar reflective mirror according to claim 1 or 2, wherein the metal reflective layer is formed by a wet method and contains silver or a silver alloy.   The said resin board protective layer has gas barrier property, The mirror for sunlight reflection as described in any one of Claims 1-3 characterized by the above-mentioned.   The said resin board protective layer is the said curable resin film layer, and the said curable resin film layer contains a thermosetting resin or an ultraviolet curable resin, The solar reflective film of Claim 1 characterized by the above-mentioned. mirror.   A solar power generation reflecting device, comprising the solar light reflecting mirror according to any one of claims 1 to 5.

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