JP2012047861A - Film mirror, manufacturing method thereof, and film mirror for condensing solar light - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film mirror having a higher reflectance than a conventional film mirror and higher durability and anti fouling property, and to provide a film mirror for condensing solar light that maintains thermal power generation efficiency for a long term when the film mirror is used in a reflector for solar thermal power generation device.SOLUTION: The film mirror comprises a metal reflection layer on a resin substrate, and does not include a layer formed by laminating resin films on the metal reflection film at a light incident side, but includes an inorganic gas barrier film instead.

Description

  The present invention relates to a film mirror, a method for manufacturing the same, and a film mirror for collecting sunlight using the same.

  In recent years, utilization of natural energy has been studied as an alternative energy to fossil fuel energy such as oil and natural gas. Among them, solar energy, which is the most stable alternative energy for fossil fuels and has a large amount of energy, is attracting attention.

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

  At present, research and development of solar cells are actively carried out, and the use efficiency of solar light is increasing, but it has not yet reached a sufficient recovery efficiency.

  As another method for converting sunlight into energy, solar thermal power generation, in which heat generated by collecting sunlight is used as a medium, has attracted attention. If this method is used, it is possible to generate power regardless of day and night, and from the long-term perspective, it is considered that the power generation efficiency is higher than that of the solar cell, so that sunlight can be used effectively.

  Currently, glass mirrors using glass substrates are used as reflecting mirrors used in solar thermal power generation. Glass mirrors have high environmental durability, but have problems such as heavy weight, large volume, high transportation costs, difficult installation, and easy breakage.

  Therefore, in order to solve the above problem, a film mirror has been proposed in which the reflective layer is made of silver and the surface sealing layer made of glass is replaced with a polymer film made of resin (for example, Patent Document 1 and 2).

  The polymer film is known to be deteriorated by sunlight, particularly ultraviolet rays having a wavelength of 380 nm or less. As a countermeasure, the polymer film described in Patent Document 1 and Patent Document 2 contains an ultraviolet absorber. When the specular reflectance of these film mirrors is measured with a spectrophotometer in the range of 2500 nm to 250 nm, the reflectance in the infrared region with a wavelength longer than 1600 nm is lower than the reflectance of silver itself in addition to the reflectance in the ultraviolet region. (See FIG. 2). For example, in the case of 2.125 μm PET / Ag shown in FIG. 2, absorption in the infrared region is due to vibration absorption of the polymer. Absorption inherent in resin materials.

  As can be seen in FIG. 1, the irradiation spectrum of sunlight is observed from 2500 nm. When using solar energy for thermoelectric generation, if the surface sealing layer has absorption in the infrared region of 1600 nm to 2500 nm, it is not preferable because it leads to a decrease in thermoelectric generation efficiency.

  Furthermore, this polymer film has a higher permeability to gases such as oxygen and water vapor than glass, and permeates into the metal reflective layer over time in an environment exposed to rain and dew.

  Although the gas diffusion coefficient D of each polymer film is different, the diffusion time is proportional to the thickness of the polymer film, and the thicker the film, the slower the permeation of the gas that degrades the metal reflective layer. Becomes longer. However, when the thickness of the polymer film is increased, the above-described absorption cross-sectional area in the infrared region is increased, so that the thermoelectric generation efficiency is lowered. Improving durability and maintaining thermoelectric efficiency was a trade-off.

  Therefore, an injection-molded plastic mirror has been developed in which a metal reflective layer is covered with a metal oxide on the surface of a resin substrate (see, for example, Patent Document 3). This injection-molded plastic mirror had a high reflectance of 90% or more on average from the ultraviolet region to the infrared region.

  Therefore, in order to correspond to a large-area mirror, in Patent Document 2, a film mirror having a structure in which a silver mirror is formed on the surface of a polymer film and the surface is covered with a metal oxide is manufactured.

  However, it has been found that when the structure in which the metal oxide is arranged on the outermost surface is applied to the film, the metal oxide cracks when the film is bent.

  The technique disclosed in Patent Document 3 has no problem with an injection-molded plastic mirror, but cannot be applied to a roll-to-roll system for producing a large-area film. It turns out that oxygen and water vapor enter from the generated crack, and the metallic reflective layer is corroded. Moreover, it turned out that the metal oxide coating film mirror once cracked does not have durability.

Japanese Patent No. 3447175 Special table 2009-520174 Japanese Patent No. 3206957

  The present invention has been made in view of the above problems and situations, and a solution to that problem is to provide a film mirror that has higher reflectivity than conventional film mirrors and has high durability and antifouling properties. . Furthermore, when the said film mirror is used for the solar power generation reflective apparatus, it is providing the film mirror for sunlight condensing which can maintain thermoelectric power generation efficiency for a long term.

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

  1. A film mirror having a metal reflecting layer on a resin base material, the light reflecting side of the metal reflecting layer having no layer provided by bonding a resin film on the light incident side of the metal reflecting layer A film mirror comprising an inorganic gas barrier layer between the outermost layer on the side and the metal reflective layer.

  2. 2. The film mirror according to item 1, wherein the inorganic gas barrier layer contains a metal oxide selected from silicon oxide, aluminum oxide, and a binary mixture of silicon oxide and aluminum oxide.

  3. The film mirror according to item 1 or 2, further comprising an antifouling hard coat layer as an outermost layer laminated on the light incident side of the inorganic gas barrier layer.

  4). The film mirror according to any one of Items 1 to 3, wherein the metal reflective layer is made of a metal thin film containing silver as a main component.

  5. Any one of the first to fourth items, wherein an ultraviolet absorber is contained in any one of the film mirror constituting layers provided on the light incident side of the resin base material. The film mirror according to item.

  6). The corrosion inhibitor layer adjacent to the metal reflective layer, and the corrosion inhibitor layer is a thioether, thiol, benzotriazole, imidazole, oxazole, tetrazaindene, pyrimidine, and thiadiazole 6. The film mirror according to any one of items 1 to 5, wherein the film mirror contains a compound selected from system compounds.

  7). The film mirror according to any one of items 1 to 6, further comprising an adhesive layer on a surface opposite to the light incident side of the resin base material.

  8). It is a manufacturing method of the film mirror which manufactures the film mirror as described in any one of said 1st term | claim-7th, Comprising: It has the process of forming the said metal reflective layer by silver vapor deposition, The film characterized by the above-mentioned. Mirror manufacturing method.

  9. A film mirror for solar condensing, wherein the film mirror according to any one of items 1 to 7 is provided on a support.

  By the above means of the present invention, it is possible to provide a film mirror having a higher reflectivity and higher durability and antifouling properties than conventional film mirrors. Furthermore, when the said film mirror is used for the solar power generation reflective apparatus, the film mirror for sunlight condensing which can maintain thermoelectric generation efficiency for a long term can be provided.

  Conventionally, in order to maintain weather resistance, a protective film is provided by bonding a resin film to the mirror surface. However, in the present invention, an inorganic gas barrier layer is provided between the outermost layer and the metal reflective layer instead of attaching a resin film on the sunlight incident side, and the outermost layer (“outermost layer” is provided to protect the inorganic gas barrier layer. ”), Both durability and transmittance can be maintained. As this outermost layer, an antifouling hard coat layer having a thickness of about several μm is preferably used.

  That is, the film mirror that has been proposed so far suppresses the transmission of gas molecules such as oxygen and water vapor by sticking a thick resin film of several tens of μm to the sunlight incident side of the metal reflection layer, Silver corrosion was suppressed. However, when a thick resin film layer is provided, the light transmittance is lowered, and in particular, the transmittance at a wavelength of 1600 nm to 2500 nm is lowered. Since the wavelength in this region greatly affects the amount of heat stored in the heat medium of solar thermal power generation, the amount of power generation increases greatly when the reflectance in this region increases.

  Therefore, in the present invention, the metal layer (silver layer) is protected from corrosion from external factors by providing an inorganic gas barrier layer between the outermost layer on the sunlight incident side surface and the metal (for example, silver) reflective layer.

  Since the inorganic gas barrier layer is vulnerable to bending, impact, etc., for protection, the outermost layer is provided on the upper layer of the inorganic gas barrier layer, so that the film mirror according to the present invention can maintain a high reflectance over a long period of time. I understood.

Diagram showing the irradiation spectrum range of sunlight Diagram showing spectral reflectance of mirror Sectional drawing which shows an example of the typical film mirror of this invention

  The film mirror of the present invention is a film mirror having a metal reflective layer on a resin base material, and does not have a layer in which a resin film is bonded to the light incident side of the metal reflective layer. An inorganic gas barrier layer is provided between the outermost layer on the light incident side and the metal reflective layer. This feature is a technical feature common to the inventions according to claims 1 to 10.

  As an embodiment of the present invention, from the viewpoint of manifesting the effects of the present invention, the inorganic gas barrier layer contains a metal oxide selected from silicon oxide, aluminum oxide, and a binary mixture of silicon oxide and aluminum oxide. It is preferable. Furthermore, it is preferable to have an antifouling hard coat layer as the outermost layer laminated on the light incident side of the inorganic gas barrier layer.

  In the present invention, the metal reflective layer is preferably made of a metal thin film containing silver as a main component. Moreover, it is preferable that an ultraviolet absorber is contained in any one of the film mirror constituent layers provided by being laminated on the light incident side of the resin base material. Furthermore, it has a corrosion inhibitor layer adjacent to the metal reflective layer, and the corrosion inhibitor layer is a thioether-based, thiol-based, Ni-coordinated organic compound, benzotriazole-based, imidazole-based, oxazole-based, tetrazine It is preferable to contain a compound selected from den-based, pyrimidine-based, and thiadiazole-based compounds.

  In this invention, it is preferable that it is an aspect which has an adhesion layer in the surface on the opposite side to the light-incidence side of the said resin base material.

  The film mirror manufacturing method for manufacturing the film mirror of the present invention is preferably a manufacturing method in an embodiment having a step of forming the light reflecting layer by silver vapor deposition.

  The film mirror of this invention can be used suitably for the film mirror for sunlight condensing.

  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.

(Outline of configuration of film mirror of the present invention and film mirror for collecting sunlight)
An outline of the configuration of the film mirror of the present invention and the film mirror for collecting sunlight will be described with reference to FIG.

  A typical configuration of the film mirror of the present invention has at least a metal (for example, silver) reflective layer 5 as a constituent layer on a resin base material 3, a gas barrier layer 8 as an upper layer, and an antifouling hard as an outermost layer. In this embodiment, the coat layer 9 is provided.

  In addition to the metal reflection layer 5 and the gas barrier layer 8, the ultraviolet ray absorption layer 7, the corrosion prevention layer 6, the metal layer 4, and the adhesive layer are used as the configuration mode layers of the film mirror or the solar light collecting film mirror of the present invention. 2. Providing the support 1 is also a preferred embodiment.

(Inorganic gas barrier layer)
The film mirror of the present invention is a film mirror having a metal reflective layer on a resin base material, and does not have a layer in which a resin film is bonded to the light incident side of the metal reflective layer. An inorganic gas barrier layer is provided between the outermost layer on the light incident side and the metal reflective layer.

  The inorganic gas barrier layer according to the present invention (also simply referred to as “gas barrier layer”) is used to prevent deterioration of humidity, particularly deterioration of a resin base material and various functional elements protected by the resin base material due to high humidity. However, it may be provided with a special function / use, and various types of gas barrier layers can be provided as long as the above characteristics are maintained.

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 / μm or less, preferably 50 g / m ² · day / μm or less, more preferably 20 g / m ^2. -It is preferable to adjust the moisture-proof property of the gas barrier layer so as to be not more than day / μm.

Also. The oxygen permeability 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.

  The gas barrier layer according to the present invention is not particularly limited in its formation method, but there is a method of forming an inorganic oxide film by applying an inorganic oxide precursor and then heating and / or irradiating ultraviolet rays. Preferably used.

<Inorganic oxide>
The inorganic oxide is preferably formed from a sol using the organometallic compound as a raw material by local heating. Therefore, silicon (Si), aluminum (Al), zirconium (Zr), titanium (Ti), tantalum (Ta), zinc (Zn), barium (Ba), indium (In) contained in the organometallic compound, It is an oxide of an element such as tin (Sn) or niobium (Nb).

  For example, silicon oxide, aluminum oxide, zirconium oxide and the like. Of these, silicon oxide is preferable.

  In the present invention, as a method for forming the inorganic oxide, it is preferable to use a so-called sol-gel method or a polysilazane method. The sol-gel method is a method of forming an inorganic oxide from an organometallic compound that is a precursor of an inorganic oxide, and the polysilazane method is a method of forming an inorganic oxide from a polysilazane that is a precursor of an inorganic oxide.

<Inorganic oxide precursor>
The gas barrier layer can be formed by applying a general heating method after applying a precursor for forming an inorganic oxide by heating, but is preferably formed by local heating. The precursor is preferably a sol-shaped organometallic compound or polysilazane.

<Organic metal compound>
The organometallic compound includes silicon (Si), aluminum (Al), lithium (Li), zirconium (Zr), titanium (Ti), tantalum (Ta), zinc (Zn), barium (Ba), and indium (In). , Tin (Sn), lanthanum (La), yttrium (Y), and niobium (Nb). In particular, the organometallic compound is at least one element of silicon (Si), aluminum (Al), lithium (Li), zirconium (Zr), titanium (Ti), zinc (Zn), and barium (Ba). It is preferable to contain. Furthermore, it is preferable to contain at least one element of silicon (Si), aluminum (Al), and lithium (Li).

  The organometallic compound is not particularly limited as long as it can be hydrolyzed, and preferred organometallic compounds include metal alkoxides.

  The metal alkoxide is represented by the following general formula (I).

General formula _{^{(I): MR 2 m (}} OR 1) n-m
In the general formula (I), M represents a metal having an oxidation number n. R ¹ and R ² each independently represents an alkyl group. m represents an integer of 0 to (n-1). R ¹ and R ² may be the same or different. R ¹ and R ² are preferably alkyl groups having 4 or less carbon atoms, for example, a methyl group CH ₃ (hereinafter represented by Me), an ethyl group C ₂ H ₅ (hereinafter represented by Et), a propyl group. C ₃ H ₇ (hereinafter represented by Pr), isopropyl group i-C ₃ H ₇ (hereinafter represented by i-Pr), butyl group C ₄ H ₉ (hereinafter represented by Bu), isobutyl group i- Lower alkyl groups such as C ₄ H ₉ (hereinafter represented by i-Bu) are more preferred.

Examples of the metal alkoxide represented by the general formula (I) include lithium ethoxide LiOEt, niobium ethoxide Nb (OEt) ₅ , magnesium isopropoxide Mg (OPr-i) ₂ , aluminum isopropoxide Al (OPr -I) ₃ , zinc propoxide Zn (OPr) ₂ , tetraethoxysilane Si (OEt) ₄ , titanium isopropoxide Ti (OPr-i) ₄ , barium ethoxide Ba (OEt) ₂ , barium isopropoxide Ba ( OPr-i) ₂ , triethoxyborane B (OEt) ₃ , zirconium propoxide Zn (OPr) ₄ , lanthanum propoxide La (OPr) ₃ , yttrium propoxide Y (OPr) ₃ , lead isopropoxide Pb (OPr- i) ₂ etc. are mentioned suitably. All of these metal alkoxides are commercially available and can be easily obtained. Moreover, the metal alkoxide is also commercially available as a low condensate obtained by partial hydrolysis, and it can be used as a raw material.

<Sol-gel method>
Here, the “sol-gel method” is to obtain a hydroxide sol by hydrolyzing an organometallic compound, etc., dehydrate it into a gel, and then heat the gel. It refers to a method for preparing a metal oxide glass having a certain shape (film, particle, fiber, etc.). A multi-component metal oxide glass can be obtained by a method of mixing a plurality of different sol solutions, a method of adding other metal ions, or the like.

  Specifically, it is preferable to produce an inorganic oxide by a sol-gel method having the following steps.

  That is, in a reaction solution containing at least water and an organic solvent, the organometallic compound is hydrolyzed and dehydrated and condensed while adjusting the pH to 4.5 to 5.0 using a halogen ion as a catalyst in the presence of boron ion. Generation of micropores due to high-temperature heat treatment is produced by a sol-gel method having a step of obtaining a reaction product by heating and vitrifying the reaction product at a temperature of 200 ° C. or less. And is particularly preferable from the viewpoint that no deterioration of the film occurs.

  In the sol-gel method, the organometallic compound used as a raw material is not particularly limited as long as it can be hydrolyzed, and a preferable organometallic compound includes the metal alkoxide. .

  In the sol-gel method, the organometallic compound may be used for the reaction as it is, but it is preferably diluted with a solvent for easy control of the reaction. The solvent for dilution is not particularly limited as long as it can dissolve the organometallic compound and can be uniformly mixed with water. Preferred examples of such a solvent for dilution include aliphatic lower alcohols such as methanol, ethanol, propanol, isopropanol, butanol, isobutanol, ethylene glycol, propylene glycol, and mixtures thereof. Further, a mixed solvent of butanol, cellosolve, and butyl cellosolve, or a mixed solvent of xylol, cellosolve acetate, methyl isobutyl ketone, and cyclohexane may be used.

In the organometallic compound, when the metal is Ca, Mg, Al, etc., it reacts with water in the reaction solution to produce a hydroxide, or when carbonate ion CO ₃ ^2- is present, produces a carbonate. Therefore, it is preferable to add an alcohol solution of triethanolamine as a masking agent to the reaction solution. The concentration of the organometallic compound when mixed and dissolved in a solvent is preferably 70% by mass or less, and more preferably diluted to a range of 5 to 70% by mass.

  The reaction liquid used in the sol-gel method contains at least water and an organic solvent. The organic solvent is not particularly limited as long as it can form a uniform solution with water, acid, and alkali, and usually the same aliphatic lower alcohols used for diluting the organometallic compound are preferably used. Among the aliphatic lower alcohols, propanol, isopropanol, butanol, and isobutanol having a larger number of carbon atoms are preferable to methanol and ethanol. This is because the growth of the metal oxide glass film to be generated is stable. In the reaction solution, the water ratio is preferably in the range of 0.2 to 50 mol / L as the water concentration.

In the sol-gel method, an organometallic compound is hydrolyzed in the reaction solution using a halogen ion as a catalyst in the presence of boron ions. Preferred examples of the compound that gives the boron ion B ³⁺ include trialkoxyborane B (OR) ₃ . Among these, triethoxyborane B (OEt) ₃ is more preferable. Moreover, as a ^{B3 +} ion concentration in the said reaction liquid, the range of 1.0-10.0 mol / L is preferable.

As said halogen ion, a fluorine ion and / or a chlorine ion are mentioned suitably. That is, fluorine ions alone, chlorine ions alone or a mixture thereof may be used. The compound to be used may be any compound that generates fluorine ions and / or chlorine ions in the reaction solution. For example, as the fluorine ion source, ammonium hydrogen fluoride NH ₄ HF · HF, sodium fluoride NaF, or the like is preferable. Preferred examples of the chlorine ion source include ammonium chloride NH ₄ Cl.

  The concentration of the halogen ions in the reaction solution varies depending on the film thickness of an inorganic composition having an inorganic matrix to be produced and other conditions, but generally the reaction solution containing a catalyst. Is preferably in the range of 0.001 to 2 mol / kg, particularly 0.002 to 0.3 mol / kg. If the halogen ion concentration is lower than 0.001 mol / kg, hydrolysis of the organometallic compound does not proceed sufficiently, and film formation becomes difficult. Alternatively, when the concentration of halogen ions exceeds 2 mol / kg, the generated inorganic matrix (metal oxide glass) tends to be non-uniform, which is not preferable.

With respect to the boron used during the reaction, if to be contained as a B ₂ O ₃ component in the design the composition of the resulting inorganic matrix, by leaving product was added calculated amount of organic boron compound in accordance with the content of In addition, when it is desired to remove boron, boron can be removed by evaporation as boron methyl ester by heating after film formation in the presence of methanol as a solvent or by immersing in methanol.

  In the step of hydrolyzing and dehydrating and condensing the organometallic compound to obtain a reaction product, a main agent solution in which a predetermined amount of the organometallic compound is usually mixed and dissolved in a mixed solvent containing a predetermined amount of water and an organic solvent, In addition, a predetermined amount of the reaction solution containing a predetermined amount of the above-mentioned halogen ions is mixed at a predetermined ratio and sufficiently stirred to obtain a uniform reaction solution, and then the pH of the reaction solution is adjusted to a desired value with acid or alkali. The reaction product is obtained by aging for several hours. A predetermined amount of the boron compound is mixed and dissolved in advance in the main agent solution or reaction solution. Further, when alkoxyborane is used, it is advantageous to dissolve it in the main agent solution together with other organometallic compounds.

  The pH of the reaction solution is selected depending on the purpose, and for the purpose of forming a film (film) made of an inorganic composition having an inorganic matrix (metal oxide glass), for example, the pH is adjusted using an acid such as hydrochloric acid. It is preferable to ripen by adjusting to a range of 4.5-5. In this case, for example, it is convenient to use a mixture of methyl red and bromocresol green as an indicator.

In the sol-gel method, the main component solution of the same concentration and the reaction solution (including B ³⁺ and halogen ions) of the same component are added successively in the same ratio while being adjusted to a predetermined pH. The reaction product can also be produced simply and continuously. The concentration of the reaction solution is in the range of ± 50% by mass, the concentration of water (including acid or alkali) is in the range of ± 30% by mass, and the concentration of halogen ions is in the range of ± 30% by mass. Can be changed.

  Next, the reaction product (reaction solution after aging) obtained in the previous step is heated to a temperature of 200 ° C. or lower, dried and vitrified. In heating, it is preferable to raise the temperature gradually after paying attention to a temperature range of 50 to 70 ° C., followed by a preliminary drying (solvent volatilization) step. This drying is important for forming a non-porous film in the case of film formation. The temperature for heating and drying after the preliminary drying step is preferably 70 to 150 ° C, more preferably 80 to 130 ° C.

<Polysilazane method>
When the precursor contains polysilazane, a solution containing a catalyst as necessary in a polysilazane represented by the following general formula (II) and an organic solvent is applied, and the solvent is removed by evaporation. Leaving a polysilazane layer having a layer thickness of 0.05 to 3.0 μm on the resin substrate, and in the presence of oxygen, active oxygen, and optionally nitrogen in an atmosphere containing water vapor It is preferable to employ a method of forming a glass-like transparent film on the resin substrate by locally heating the layer.

Formula (II): — (SiR ₁ R ₂ —NR ₃ ) _n —
[Wherein R ₁ , R ₂ , and R ₃ are the same or different and independently of each other, hydrogen, or an optionally substituted alkyl group, aryl group, vinyl group, or (trialkoxysilyl) alkyl group Preferably from hydrogen, methyl, ethyl, propyl, iso-propyl, butyl, iso-butyl, tert-butyl, phenyl, vinyl or 3- (triethoxysilyl) propyl, 3- (trimethoxysilylpropyl) Represents a selected group, where n is an integer and n is defined such that the polysilazane has a number average molecular weight of 150 to 150,000 g / mol. ]
As catalysts, preferably basic catalysts, in particular N, N-diethylethanolamine, N, N-dimethylethanolamine, triethanolamine, triethylamine, 3-morpholinopropylamine or N-heterocyclic compounds are used. . The catalyst concentration is usually in the range of 0.1 to 10 mol%, preferably 0.5 to 7 mol%, based on polysilazane.

In one of the preferred embodiments, a solution containing perhydropolysilazane in which all of R ₁ , R ₂ and R ₃ are hydrogen atoms is used.

  In yet another preferred embodiment, the coating according to the invention comprises at least one polysilazane of the general formula (III)

Formula _{(III) :-( SiR 1 R 2} -NR 3) n - (SiR 4 R 5 -NR 6) p -
[Wherein R ₁ , R ₂ , R ₃ , R ₄ , R ₅ and R ₆ are, independently of one another, hydrogen, or an optionally substituted alkyl group, aryl group, vinyl group or (trialkoxysilyl group). ) Represents an alkyl group, where n and p are integers, and n is defined such that the polysilazane has a number average molecular weight of 150 to 150,000 g / mol. ]
Particularly preferred are compounds wherein R ₁ , R ₃ and R ₆ represent hydrogen and R ₂ , R ₄ and R ₅ represent methyl, R ₁ , R ₃ and R ₆ represent hydrogen and R ₂ , A compound in which R ₄ represents methyl and R ₅ represents vinyl, R ₁ , R ₃ , R ₄ and R ₆ represent hydrogen and R ₂ and R ₅ represent methyl.

  A solution containing at least one polysilazane represented by the following general formula (IV) is also preferable.

Formula _{(IV) :-( SiR 1 R 2} -NR 3) n - (SiR 4 R 5 -NR 6) p - (SiR 7 R 8 -NR 9) q -
[Wherein R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , R ₆ , R ₇ , R ₈ and R ₉ are independently of one another hydrogen or optionally substituted alkyl group, Represents an aryl group, a vinyl group or a (trialkoxysilyl) alkyl group, where n, p and q are integers, and n is such that the polysilazane has a number average molecular weight of 150 to 150,000 g / mol. Determined. ]
Particularly preferred are R ₁ , R ₃ and R ₆ represent hydrogen and R ₂ , R ₄ , R ₅ and R ₈ represent methyl, R ₉ represents (triethoxysilyl) propyl and R ₇ Is a compound in which represents alkyl or hydrogen.

  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, in particular, an aprotic solvent which does not contain water and a reactive group (for example, hydroxyl group or amine group) and is inert to polysilazane, preferably an aprotic solvent is 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 can be a further binder such as those conventionally used in the manufacture 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.

The polysilazane further components of the formulation, for example, the viscosity of the formulation, wetting the underlying film-forming property, additives influencing the lubrication or exhaust resistance, or inorganic nanoparticles, for example SiO _2, TiO _2, It can be ZnO, ZrO ₂ or Al ₂ O ₃ .

  By using the method of the present invention, since there are no cracks and holes, it is possible to form a dense gas barrier layer excellent in a high barrier action against gas, and to prevent deterioration of the metal reflection layer.

  The thickness of the film to be formed is preferably in the range of 10 nm to 2 μm.

(Anti-fouling hard coat layer)
In the present invention, the antifouling hard coat layer of the film mirror has both antifouling properties and hard coat properties. “Anti-fouling property” is preferably a surface on which dirt is not easily deposited or easily washed off even when the film mirror is left in an outdoor environment. Therefore, as a physical property value of the antifouling hard coat layer, the contact angle with water is preferably 0 to 40 ° or 90 to 180 °, more preferably 0 to 10 ° or 120 to 180 °.

The sliding angle (sliding angle) is preferably 30 ° or less, more preferably 10 ° or less. In terms of hardness, it is preferable that the pencil hardness (load 500 g) is 2H or more, and the steel wool test (500 g / cm ² ) does not cause scratches.

  As a method for producing a layer having high hardness, a method using an inorganic film, a method for producing a resin having a high crosslinking density / hardness by accelerating the crosslinking of the resin by heat or ultraviolet rays, and an inorganic particle having a modified alkyl group on the resin. There is a method of containing and crosslinking and curing by heat or ultraviolet rays.

  Examples of the hydrophilic layer include a method of orienting hydroxyl groups (hydroxyl groups) on the surface and a method of forming a fine shape on the surface. As a method of orienting hydroxyl groups, a method of adding a compound having a hydroxyl group in the side chain in the film, a method of adding inorganic particles modified with hydroxyl groups, and a functional group existing on the film surface are substituted with hydroxyl groups There are a method of applying such a solution, a method of performing a surface treatment and fine processing, and the like.

  As a layer exhibiting water repellency, there is a method of orienting fluorine or silicon on the surface. Preferably, fluorine is preferably used because high water repellency and oil repellency can be obtained. However, since fluorine has a problem of low surface hardness, the fluororesin itself cannot be used. Therefore, if a fluororesin is added to the hard coat layer, the surface is unevenly distributed due to the surface orientation of fluorine, and the water repellency of the resin surface is obtained. Alternatively, the hard coat property can be expressed by forming a very thin layer of fluorine on the upper layer of the coat layer.

  In addition, since the film mirror is used outdoors, weather resistance is required. Therefore, it is better to mix an ultraviolet absorber and an antioxidant described later in the antifouling hard coat layer. preferable.

  Specifically, as a material that can be used for the antifouling hard coat layer, a photo-curing hydrophilic acrylic resin film (Japanese Patent Laid-Open No. 7-48148), an acrylate resin composition, a polysiloxane resin (Daikensha) ), Silicon hard coat (Noda Screen) polysilazane, aqueous colloidal silica-containing acrylic resin (Japanese Patent Laid-Open No. 2005-66824), polyurethane-based resin composition (Japanese Patent Laid-Open No. 2005-110918), and water-based silicon compound as binders Resin film used (Japanese Patent Laid-Open No. 2004-142161), silica film containing photocatalytic oxide such as titanium oxide or alumina, photocatalytic film such as titanium oxide or niobium oxide having a high aspect ratio (Japanese Patent Laid-Open No. 2009-62216), photocatalyst Fluorine resin coating (Pierex Technology) Inc.), an organic / inorganic polysilazane film, films using an organic / inorganic polysilazane hydrophilic enhancer (AZ Electronics Co., Ltd.), and the like.

  In the case of hydrophilicity, surface treatment can be promoted. For example, corona treatment (JP-A-11-172028), plasma surface treatment, ultraviolet ray / ozone treatment, surface projection formation (2009-226613), surface fine processing treatment, and the like can be mentioned.

  As a production method, a conventionally known coating method such as a gravure coating method, a reverse coating method, a die coating method, or a dip coating can be used.

  When the outermost layer is made of an inorganic material, for example, in the case of silicon oxide, aluminum oxide, silicon nitride, aluminum nitride, lanthanum oxide, lanthanum nitride, etc., it can be formed by a vacuum film forming method. Examples of the vacuum film forming method include a resistance heating vacuum deposition method, an electron beam heating vacuum deposition method, an ion plating method, an ion beam assisted vacuum deposition method, and a sputtering method.

  The outermost layer is preferably flexible and does not warp. The outermost layer may form a dense cross-linked structure, in which case the film may bend or bend, and may be easily cracked, making handling difficult. In such a case, it is preferable to design so as to provide flexibility and flatness by adjusting the amount of the inorganic substance in the composition.

(Metal reflective layer)
The metal reflective layer according to the present invention refers to a layer composed of a metal that reflects visible light and infrared light.

  Although it does not specifically limit as a metal reflective layer which concerns on this invention, Silver and aluminum can be used and especially silver can be used preferably. By using silver, a reflectance higher than that of aluminum can be obtained for light having a wavelength of 380 nm or more.

  When silver or aluminum is used for the metal reflective layer, it is basically desirable to use silver alone or aluminum alone, but gold, copper, nickel, iron, cobalt, tungsten, molybdenum to the extent that they do not adversely affect their properties. Metal impurities such as tantalum, chromium, indium, manganese, titanium, and palladium may be included.

  When silver or aluminum is used for the metal reflective layer, the thickness of the metal reflective layer is preferably from 70 to 400 nm, more preferably from 100 to 300 nm, and even more preferably from 150 to 250 nm, from the viewpoints of reflectance and effective use of resources. It is.

  As a method for forming the metal reflective layer according to the present invention, either a wet method or a dry method can be used. 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. On the other hand, 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. In particular, a vapor deposition method (vacuum film forming method) capable of a roll-to-roll method for continuously forming a film is preferably used in the present invention.

  In addition, silver is most preferably used because high reflectance can be obtained not only in the visible light region but also in the infrared light region. Further, when the metal reflective layer is formed of silver, the weather resistance deterioration becomes more prominent, so the configuration of the present invention is effective.

(Resin base material)
As the resin base material according to the present invention, various publicly known resin films can be used. For example, 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. Among these, polycarbonate films, polyester films, norbornene resin films, cellulose ester films, and acrylic films are preferable.

  In particular, it is preferable to use a polyester film or an acrylic film, and it may be a film manufactured by melt casting or a film manufactured by solution casting.

  The thickness of the resin base material is preferably an appropriate thickness according to the type and purpose of the resin. For example, it is generally in the range of 10 to 300 μm. Preferably it is 20-200 micrometers, More preferably, it is 30-100 micrometers.

(Adhesive layer)
The adhesive layer according to the present invention is not particularly limited as long as it has a function of improving the adhesion between the metal reflective layer or the metal layer and the resin base material. Therefore, the adhesive layer has adhesiveness for closely adhering the resin substrate and the metal reflective layer or metal layer, heat resistance that can withstand heat when the silver reflective layer or metal layer is formed by a vacuum deposition method, etc., and silver. Smoothness is required to bring out the high reflection performance inherent in the reflective layer.

  The thickness of the adhesive layer is preferably 0.01 to 3 μm, more preferably 0.1 to 1 μm, from the viewpoints of adhesion, smoothness, reflectance of the reflecting material, and the like.

  When the adhesive layer is a resin, the resin is not particularly limited as long as it satisfies the above adhesiveness, heat resistance, and smoothness conditions, a polyester resin, an acrylic resin, a melamine resin, Epoxy resins, polyamide resins, vinyl chloride resins, vinyl chloride vinyl acetate copolymer resins, etc. can be used singly or as a mixed resin thereof, and in terms of weather resistance, a polyester resin and a melamine resin mixed resin are preferred. It is more preferable to use a thermosetting resin in which a curing agent such as isocyanate is further mixed. As the method for forming the adhesive layer, conventionally known coating methods such as a gravure coating method, a reverse coating method, and a die coating method can be used.

  When the adhesive layer is a metal oxide, it can be formed by various vacuum film forming methods such as silicon oxide, aluminum oxide, silicon nitride, aluminum nitride, lanthanum oxide, and lanthanum nitride. For example, there are a resistance heating vacuum deposition method, an electron beam heating vacuum deposition method, an ion plating method, an ion beam assisted vacuum deposition method, and a sputtering method.

(Anti-corrosion layer)
The corrosion prevention layer according to the present invention is preferably provided adjacent to the metal reflection layer, and contains a corrosion inhibitor for silver. As the corrosion inhibitor, broadly, a corrosion inhibitor having an adsorptive group for silver and a corrosion inhibitor having an antioxidant ability (also referred to as “antioxidant”) are preferably used.

  Here, the term “corrosion” refers to a phenomenon in which metal (silver) is chemically or electrochemically eroded or deteriorated by an environmental material surrounding it (see JIS Z0103-2004).

  It is preferable that the film mirror for solar power generation is an embodiment in which the corrosion prevention layer contains a corrosion inhibitor or an antioxidant having an adsorptive group for silver.

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 / m ² .

<Corrosion inhibitor with adsorptive group for silver>
Corrosion inhibitors having an adsorptive group for silver 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, compounds having an imidazole ring, and indazole Desirably, the compound is selected from a compound having a ring, copper chelate compounds, thioureas, a compound having a mercapto group, at least one 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, 2N- Dimethylethanolamine, 2-amino-2-methyl-1,3-propanediol, acetamide, acrylamide, benzamide, p-ethoxychrysidine, dicyclohexylammonium nitrite, dicyclohexylammonium salicylate, monoethanolaminebenzoate, dicyclohexylammonium benzoate, diisopropyl Ammonium benzoate, diisopropylammonium nitrite, Black hexylamine 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-2,5dimethylpyrrole, N-phenyl-3-formyl-2,5-dimethylpyrrole, 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′-hydroxy) 5'-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy 3'5'-di-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-4-octoxyphenyl) benzotriazole, etc. 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, 2-mercaptobenzothiazole 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, 1-benzyl-2-methyl. Imidazole, 2-phenyl-4-methylimidazole, 1-cyanoethyl-2-methylimidazole, 1-cyanoethyl-2-phenylimidazole, 1-cyanoethyl-2-ethyl-4-methylimidazole, 1-cyanoethyl-2-undecyl Imidazole, 2-phenyl-4-methyl-5-hydromethylimidazole, 2-phenyl-4,5 dihydroxymethylimidazole, 4-formylimidazole, 2-methyl-4-formylimidazole, 2-phenyl-4-phenyl Rumyl imidazole, 4-methyl-5-formyl imidazole, 2-ethyl-4-methyl-5-formyl imidazole, 2-phenyl-4-methyl-4-formyl imidazole, 2-mercaptobenzimidazole, etc., or these Of the mixture.

  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.

<Antioxidant>
As the corrosion inhibitor contained in the corrosion prevention layer according to the present invention, an antioxidant can also be used.

  As the antioxidant, it is preferable to use a phenol-based antioxidant, a thiol-based antioxidant, and a phosphite-based antioxidant.

  Examples of phenolic antioxidants include 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 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 , Triethylene glycol bis [3- (3-t-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, pentaerythritol-tetrakis- (β-lauryl-thiopropionate), and the like.

  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 and the like.

  In the present invention, the antioxidant and the following light stabilizer can be used in combination.

  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.

  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.

  In addition, a nickel-based UV stabilizer can also be used as the light stabilizer, and as the nickel-based UV stabilizer, [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.

(Metal layer)
Since the metal layer in the present invention has a sacrificial anticorrosion function for silver, it is necessary to use a metal that is adjacent to silver and has a higher ionization tendency than silver. For example, lithium, cesium, rubidium, potassium, barium, strontium, calcium, sodium, magnesium, aluminum, manganese, tantalum, zinc, chromium, iron, cadmium, cobalt, nickel, tin, lead, antimony, bismuth, copper, mercury, etc. Can be mentioned. In particular, aluminum, zinc, iron, tin, and copper are preferable.

  The manufacturing method of the metal layer may be formed by a wet method collectively referred to as a plating method, and the vacuum film forming method is preferably used even though the above-described vacuum film forming method is used.

  The film thickness of the metal layer is in the range of 10 μm to 500 μm in view of having a sacrificial anticorrosive function for silver. Preferably it is 50-300 micrometers, More preferably, it is 100-200 micrometers.

(UV absorber)
In the present invention, an ultraviolet absorber can be added for the purpose of preventing deterioration due to sunlight or ultraviolet rays. It is preferable that any one of the constituent layers provided on the resin substrate contains an ultraviolet absorber or an ultraviolet absorber layer is provided on the surface side of the corrosion prevention layer.

  Examples of the ultraviolet absorber include benzophenone-based, benzotriazole-based, phenyl salicylate-based, triazine-based, and the like as organic materials, and titanium oxide, zinc oxide, cerium oxide, iron oxide, and the like as inorganic materials.

  Examples of the benzophenone ultraviolet absorber include 2,4-dihydroxy-benzophenone, 2-hydroxy-4-methoxy-benzophenone, 2-hydroxy-4-n-octoxy-benzophenone, 2-hydroxy-4-dodecyloxy-benzophenone, 2- Hydroxy-4-octadecyloxy-benzophenone, 2,2′-dihydroxy-4-methoxy-benzophenone, 2,2′-dihydroxy-4,4′-dimethoxy-benzophenone, 2,2 ′, 4,4′-tetra And hydroxy-benzophenone.

  Examples of the benzotriazole ultraviolet absorber include 2- (2′-hydroxy-5-methylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-t-butylphenyl) benzotriazole, 2 -(2'-hydroxy-3'-t-butyl-5'-methylphenyl) benzotriazole and the like.

  Examples of the phenyl salicylate ultraviolet absorber include phenylsulcylate, 2-4-di-t-butylphenyl-3,5-di-t-butyl-4-hydroxybenzoate, and the like. Examples of hindered amine ultraviolet absorbers include bis (2,2,6,6-tetramethylpiperidin-4-yl) sebacate.

  Examples of triazine ultraviolet absorbers include 2,4-diphenyl-6- (2-hydroxy-4-methoxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-). Ethoxyphenyl) -1,3,5-triazine, 2,4-diphenyl- (2-hydroxy-4-propoxyphenyl) -1,3,5-triazine, 2,4-diphenyl- (2-hydroxy-4-) Butoxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-butoxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2- Hydroxy-4-hexyloxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-octyloxyphenyl) -1,3,5-triazi 2,4-diphenyl-6- (2-hydroxy-4-dodecyloxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-benzyloxyphenyl) -1 , 3,5-triazine and the like.

  In addition to the above, the ultraviolet absorber includes a compound having a function of converting the energy held by ultraviolet rays into vibrational energy in the molecule and releasing the vibrational energy as thermal energy or the like. Furthermore, those that exhibit an effect when used in combination with an antioxidant, a colorant, or the like, or a light stabilizer that acts as a light energy conversion agent, called a quencher, can be used in combination. However, when using the above-mentioned ultraviolet absorber, it is necessary to select one in which the light absorption wavelength of the ultraviolet absorber does not overlap with the effective wavelength of the photopolymerization initiator.

  In the case of using a normal ultraviolet ray inhibitor, it is effective to use a photopolymerization initiator that generates radicals with visible light.

  The usage-amount of a ultraviolet absorber is 0.1-20 mass%, Preferably it is 1-15 mass%, More preferably, it is 3-10 mass%. When it is more than 20% by mass, the adhesion is deteriorated, and when it is less than 0.1% by mass, the effect of improving weather resistance is small.

(Thickness of the entire film mirror)
The total thickness of the film mirror according to the present invention is preferably 75 to 250 μm, more preferably 90 to 230 μm, and still more preferably 100 to 220 μm, from the viewpoints of prevention of deflection of the mirror, regular reflectance, handling properties, and the like.

(Solar collector mirror, reflector for solar power generation)
The film mirror of the present invention can be preferably used for the purpose of collecting sunlight. The film mirror can be used alone as a solar light collecting mirror, but more preferably, an adhesive layer coated on the surface of the resin substrate opposite to the side having the metal (silver) reflective layer with the resin substrate interposed therebetween The film mirror is pasted on another base material, particularly on a metal base material, to be used as a reflection device for solar power generation.

<Adhesive layer>
The pressure-sensitive adhesive layer for bonding the metal substrate and the film mirror of the present invention 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 is used.

  For example, polyester resin, urethane resin, polyvinyl acetate resin, acrylic resin, nitrile rubber, etc. are used.

  The laminating method is not particularly limited, and for example, it is preferable to carry out continuously by a roll method from the viewpoint of economy and productivity.

  The thickness is preferably in the range of usually about 1 to 50 μm from the viewpoint of the adhesive effect, the drying speed and the like.

<Metal base material>
As the metal substrate to which the film mirror of the present invention is bonded and used as a reflector for solar power generation, steel plates, copper plates, aluminum plates, aluminum plated steel plates, aluminum alloy plated steel plates, copper plated steel plates, tin plated steel plates, chrome plated steel plates Further, a metal material having a high thermal conductivity such as a stainless steel plate or a plate material in which a resin foaming agent is sandwiched between thin metal plates (for example, Sekisui resin plastic metal) can be used. In the present invention, it is particularly preferable to use a plated steel plate, a stainless steel plate, an aluminum plate, a plate material sandwiched between thin metal plates, etc. having good corrosion resistance.

  In addition, the film mirror of the present invention can be used as a solar power generation reflection device using a base material other than the metal base material, and the other base material can provide protection for the metal reflective layer. For example, acrylic film or sheet, polycarbonate film or sheet, polyarylate film or sheet, polyethylene naphthalate film or sheet, polyethylene terephthalate film or sheet, plastic film or sheet such as fluorine film, or titanium oxide, silica, aluminum A resin film or sheet kneaded with powder, copper powder, or the like, or a resin film or sheet coated with a resin kneaded with these or subjected to surface processing such as metal deposition is used. Although there is no restriction | limiting in particular in the thickness of the film or sheet to bond, Usually, it is preferable that it is the range of 12-250 micrometers.

  In addition, these other base materials may be bonded after providing a concave portion or a convex portion before being bonded to the film mirror of the present invention, or may be formed to have a concave portion or a convex portion after being bonded. In addition, the bonding and the molding so as to have a concave portion or a convex portion may be performed at the same time.

  Hereinafter, the present invention will be specifically described with reference to FIGS. 3A and 3B using examples and comparative examples.

[Comparative Example 1]
Fig.3 (a) shows the structure of Comparative Examples 1-3.

  A biaxially stretched polyester film (polyethylene terephthalate film, thickness 100 μm) was used as the resin substrate 3. An anchor layer 4 was obtained by depositing a mixture of lanthanum oxide and aluminum oxide at a ratio of 8: 2 on one side of the polyester film to a thickness of 60 nm by vacuum deposition.

  Subsequently, the silver reflecting layer 5 was formed to 80 nm by vacuum deposition. Next, on the metal (silver) reflective layer, a polyester resin (Polyester SP-181, manufactured by Nippon Synthetic Chemical Co., Ltd.) and a TDI (tolylene diisocyanate) isocyanate (2,4-tolylene diisocyanate) are contained in a resin solid content ratio. In 10: 2 and adding methyl ethyl ketone as a solvent, and further adding 10% by weight of Tinuvin 234 (manufactured by Ciba Japan) as a corrosion inhibitor, and coating by gravure coating method, A 50 nm anti-corrosion layer 6 was formed.

  Next, a UV absorbing layer 7 was formed by coating the UV absorbing polymer “New Coat UVA-204W” (manufactured by Shin-Nakamura Chemical Co., Ltd.) by a gravure coating method to a thickness of 5 μm.

  Next, NN320 (manufactured by AZ Electronic Materials) in which 20% by mass of polysilazane was dispersed in dibutyl ether was extruded to a thickness of 7 μm, and dried at 100 ° C. for 5 minutes.

  A silicon oxide film was formed by irradiation with Xe excimer radiation at 30 mW / cm for 1 minute to form a gas barrier layer 8.

  After applying acrylic adhesive SZ7543 (manufactured by Nippon Carbite) as a pressure-sensitive adhesive to the opposite surface of the resin base material 3 to a thickness of 5 μm, laminating a PET film for laminating and curing for 6 days at 40 ° C. 2 was formed. Then, the support body 1 was formed by sticking to the Alpolic (made by Mitsubishi resin) by a roll system as a support body, and the sample of the comparative example 1 was produced.

[Comparative Example 2]
Instead of the gas barrier layer 8 of the sample obtained in Comparative Example 1, 1% by mass of a water-repellent leveling agent ZX-017 (manufactured by Fuji Kasei Kogyo Co., Ltd.) is added to a polysiloxane resin “Surcoat” (manufactured by Doken) The anti-fouling hard coat layer 9 having a thickness of 5 μm is formed by coating a solution containing 1% by mass of the UV absorber Tinuvin 477 (manufactured by Ciba Japan Co., Ltd.) by the gravure coating method and heat-treating at 120 ° C. for 30 minutes. And the sample of the comparative example 2 was produced.

[Comparative Example 3]
On the gas barrier layer of the sample prepared in Comparative Example 1, an adhesive TBS-730 (manufactured by Dainippon Ink Co., Ltd.) was coated by a gravure coating method so as to have a thickness of 5 μm, and then acrylic resin Sumitomo Chemical S001 (75 μm). ) Were bonded together by a roll method, and an antifouling hard coat layer “Surcoat” was formed in the same manner as in Comparative Example 2 to produce a sample of Comparative Example 3.

  FIG. 3B shows the configuration of Examples 1-32.

[Example 1]
A biaxially stretched polyester film (polyethylene terephthalate film, thickness 100 μm) was used as the resin substrate 3. An anchor layer 4 was obtained by depositing a mixture of lanthanum oxide and aluminum oxide at a ratio of 8: 2 on one side of the polyester film to a thickness of 60 nm by vacuum deposition. Subsequently, the silver reflecting layer 5 was formed to 80 nm by vacuum deposition. Next, on the metal (silver) reflective layer, a polyester resin (Polyester SP-181, manufactured by Nippon Synthetic Chemical Co., Ltd.) and a TDI (tolylene diisocyanate) isocyanate (2,4-tolylene diisocyanate) are contained in a resin solid content ratio. In 10: 2 and adding methyl ethyl ketone as a solvent, and further adding 10% by weight of Tinuvin 234 (manufactured by Ciba Japan) as a corrosion inhibitor, and coating by gravure coating method, A 50 nm anti-corrosion layer 6 was formed. Next, a UV absorbing polymer “New Coat UVA-204W” (manufactured by Shin-Nakamura Chemical Co., Ltd.) was coated by a gravure coating method to a thickness of 5 μm to form a UV absorbing layer 7. Next, NN320 (manufactured by AZ Electronic Materials) in which 20% by mass of polysilazane was dispersed in dibutyl ether was extruded to a thickness of 7 μm and dried at 100 ° C. for 5 minutes. A silicon oxide film was formed by irradiation with Xe excimer radiation at 30 mW / cm for 1 minute to form a gas barrier layer 8. Next, 1% by mass of a water-repellent leveling agent ZX-017 (manufactured by Fuji Kasei Kogyo) and a UV absorber Tinuvin 477 (manufactured by Ciba Japan) are added to the polysiloxane resin “Surcoat” (manufactured by Doken). The 1% by mass added solution was coated by a gravure coating method, and heat-treated at 120 ° C. for 30 minutes, thereby forming an antifouling hard coat layer 9 having a thickness of 5 μm. After applying acrylic adhesive SZ7543 (manufactured by Nippon Carbite) as a pressure-sensitive adhesive to the opposite surface of the resin base material 3 to a thickness of 5 μm, laminating a PET film for laminating and curing for 6 days at 40 ° C. 2 was formed. Then, the support body 1 was formed by pasting together as a support body for Alpolic exterior (made by Mitsubishi resin) by a roll system, and the sample of Example 1 was produced.

[Example 2]
Instead of the surcoat of the antifouling hard coat layer 9 of Example 1, a resin prepared by mixing Aronics-305 (manufactured by Toa Gosei Co., Ltd.) and Aronics-315 (manufactured by Toa Gosei Co., Ltd.) at a ratio of 7: 3 was diluted in methyl ethyl ketone. The solution was coated by a gravure coating method, dried at 80 ° C. for 1 minute, and then irradiated with UV by a high-pressure mercury lamp to form an antifouling hard coat layer 9 having a thickness of 5 μm. Except that, the sample of Example 2 was manufactured in the same manner as in Example 1.

[Example 3]
A sample of Example 3 was prepared in the same manner as in Example 1 except that XOPC-12H-25 (manufactured by Noda Screen) was used instead of the antifouling hard coat layer 9 of Example 1.

[Example 4]
In place of the antifouling hard coat layer 9 of Example 1, Optool AES (manufactured by Daikin Industries, Ltd.) was used and produced in the same manner as in Example 1, except that a 10 nm thick antifouling hard coat layer was formed. A sample of Example 4 was produced.

[Example 5]
A sample of Example 5 was produced in the same manner as in Example 1 except that a layer obtained by vacuum-depositing alumina was formed instead of the gas barrier layer of Example 1.

[Example 6]
A sample of Example 6 was produced in the same manner as in Example 2 except that a layer obtained by vacuum-depositing alumina was formed instead of the gas barrier layer of Example 2.

[Example 7]
A sample of Example 7 was produced in the same manner as in Example 2 except that a layer obtained by vacuum-depositing alumina was formed instead of the gas barrier layer of Example 3.

[Example 8]
A sample of Example 8 was produced in the same manner as in Example 2 except that a layer obtained by vacuum-depositing alumina was formed instead of the gas barrier layer of Example 4.

[Example 9]
Instead of the UV absorbing layer of Example 6, a polyester resin (Polyester SP-181, manufactured by Nippon Synthetic Chemical Co., Ltd.) and a TDI (tolylene diisocyanate) isocyanate (2,4-tolylene diisocyanate) are used as a resin solid content ratio. The mixture was mixed at 10: 2 and methyl ethyl ketone was added as a solvent. Further, titanium oxide (manufactured by Teika) and zinc oxide (manufactured by Teica) were mixed in an amount of 3% by mass and coated by gravure coating. A UV absorption layer 7 having a thickness of 50 nm was formed. Other than that was produced by the same method as in Example 6, and the sample of Example 9 was produced.

[Example 10]
A sample of Example 10 was prepared in the same manner as in Example 9 except that BPS-5296 (manufactured by Toyo Ink Co., Ltd.) was used instead of the adhesive SZ7543 of Example 9.

[Example 11]
A sample of Example 11 was prepared in the same manner as in Example 10 except that plametal AP883AK (manufactured by Sekisui Jushi Co., Ltd.) was used instead of the support Alpolic exterior of Example 10.

[Example 12]
Instead of the UV-absorbing polymer of Example 6, a polyester resin (Polyester SP-181, manufactured by Nippon Synthetic Chemical Co., Ltd.) and a TDI (tolylene diisocyanate) isocyanate (2,4-tolylene diisocyanate) are used as a resin solid content ratio. In 10: 2 and adding methyl ethyl ketone as a solvent, and further mixing the amount of Tinuvin 1577 (manufactured by Ciba Japan) to 3% by mass, coating by gravure coating method, UV absorption with a thickness of 50 nm Layer 7 was formed. Other than that was produced by the same method as in Example 6, and the sample of Example 12 was produced.

[Example 13]
A sample of Example 13 was produced in the same manner as in Example 12 except that BPS-5296 was used instead of the adhesive SZ7543 of Example 12.

[Example 14]
A sample of Example 14 was prepared in the same manner as in Example 13 except that the plametal AP883AK was used instead of the support Alpolic exterior of Example 13.

[Example 15]
A sample of Example 15 was produced in the same manner as in Example 9 except that the 5 mm-thick aluminum plate was used instead of the support Alpolic exterior of Example 9.

[Example 16]
A sample of Example 16 was produced in the same manner as in Example 9 except that the aluminum plate having a thickness of 5 mm was used instead of the support Alpolic exterior of Example 10.

[Example 17]
A sample of Example 17 was produced in the same manner as in Example 16 except that SZ7543 was used instead of the adhesive BPS-5296 of Example 16.

[Example 18]
A sample of Example 18 was prepared in the same manner as in Example 2 except that the UV absorbing layer containing an inorganic UV absorber used in Example 9 was used instead of the UV absorbing polymer of Example 2.

[Example 19]
A sample of Example 19 was prepared in the same manner as in Example 18 except that the UV absorbing layer containing Tinuvin 1577 used in Example 12 was used instead of the UV absorbing layer containing an inorganic UV absorber in Example 18. did.

[Example 20]
A sample of Example 20 was prepared in the same manner as in Example 4 except that the UV absorbing layer containing an inorganic UV absorber used in Example 9 was used instead of the UV absorbing polymer of Example 4.

[Example 21]
A sample of Example 21 was prepared in the same manner as in Example 8 except that the UV absorbing layer containing an inorganic UV absorber used in Example 9 was used instead of the UV absorbing polymer of Example 8.

[Example 22]
A sample of Example 22 was prepared in the same manner as in Example 9 except that a polysiloxane resin was used instead of the Aronics 305 and Aronics 315 mixed resin of the antifouling hard coat layer of Example 9.

[Example 23]
A sample of Example 23 was prepared in the same manner as in Example 10 except that a polysiloxane resin was used instead of the mixed resin of Aronics 305 and Aronics 315 of the antifouling hard coat layer of Example 10.

[Example 24]
A sample of Example 24 was prepared in the same manner as in Example 11 except that a polysiloxane resin was used instead of the mixed resin of Aronics 305 and Aronics 315 of the antifouling hard coat layer of Example 11.

[Example 25]
A sample of Example 25 was prepared in the same manner as in Example 12 except that polysiloxane resin was used instead of the Aronics 305 and Aronics 315 mixed resin of the antifouling hard coat layer of Example 12.

[Example 26]
A sample of Example 26 was prepared in the same manner as in Example 13 except that a polysiloxane resin was used instead of the Aronics 305 and Aronics 315 mixed resin of the antifouling hard coat layer of Example 13.

[Example 27]
A sample of Example 27 was prepared in the same manner as in Example 14 except that a polysiloxane resin was used instead of the mixed resin of Aronics 305 and Aronics 315 of the antifouling hard coat layer of Example 14.

[Example 28]
A sample of Example 28 was prepared in the same manner as in Example 15 except that a polysiloxane resin was used instead of the mixed resin of Aronics 305 and Aronics 315 of the antifouling hard coat layer of Example 15.

[Example 29]
A sample of Example 29 was prepared in the same manner as in Example 16 except that polysiloxane resin was used instead of the Aronics 305 and Aronics 315 mixed resin of the antifouling hard coat layer of Example 16.

[Example 30]
A sample of Example 30 was prepared in the same manner as in Example 17 except that a polysiloxane resin was used instead of the Aronics 305 and Aronics 315 mixed resin of the antifouling hard coat layer of Example 17.

[Example 31]
A sample of Example 31 was prepared in the same manner as in Example 18 except that polysiloxane resin was used instead of the Aronics 305 and Aronics 315 mixed resin of the antifouling hard coat layer of Example 18.

[Example 32]
A layer configuration that does not form the UV absorbing layer 7 of the sample prepared in Example 1 was prepared as the sample of Example 32.

[Evaluation]
The film mirror obtained above was measured for regular reflectance, weather resistance, and ultraviolet resistance by the following methods.

<Measurement of regular reflectance>
The spectrophotometer “U-4100” manufactured by Shimadzu Corporation was adjusted so that the incident angle of incident light was 5 ° with respect to the normal of the reflecting surface, and the regular reflectance at a reflection angle of 5 ° was measured. . Evaluation was measured as an average reflectance from 250 nm to 2500 nm.

<Steel wool test>
When the steel wool # 0000 was rubbed 10 reciprocally at a load of 500 g / cm ³ on the surface of the sample, the degree of scratches on the sample surface was visually observed to count the number of scratches.

<Contact angle test>
Based on JIS-R3257, using a contact angle meter DM501 (Kyowa Interface Chemistry), 3 μl of water was dropped and the contact angle on the surface of the film mirror was measured.

<Tumble angle>
A sliding method kit DM-SA01 was attached to a contact angle meter DM501 (Kyowa Interface Chemistry), and 50 μl of water was dropped to measure the falling angle of the surface of the film mirror.

<Adhesion>
The surface of the sample is scratched with a cutter in accordance with JIS-K5400 to make 100 1 mm square grids, and cellophane adhesive tape (Sekisui Chemical, # 252, 25 mm width, SP adhesive strength: 750 gf / 25 mm width) is attached. It was. One end of this tape is held at a right angle to the surface of the sample, and represents the number of base meshes that have been peeled off instantaneously. Indicates the number of cells peeled off.

<Weather resistance test>
UV tester (manufactured by Iwasaki Electric Co., Ltd.) The specular reflectance, steel wool resistance, contact angle, sliding angle, and adhesion after standing for 10 days under the conditions of illuminance of 100 mW, temperature of 60 ° C. and humidity of 63% RH are as above. It measured by the same method.

  Table 1 summarizes the materials (candidate members) used in the antifouling hard coat layer, inorganic barrier layer, UV absorber layer, pressure-sensitive adhesive, and support in the comparative examples and examples. Tables 2 and 3 collectively show the numbers of materials (candidate members) actually used in each comparative example and example. Table 4 shows the evaluation results of the respective comparative examples and examples.

  As is apparent from the evaluation results shown in Table 4, it can be seen that the various characteristics of the examples according to the present invention are superior to the comparative examples. In particular, Comparative Example 1 is damaged by a steel wool test because the surface does not have a hard coat property. Regarding Comparative Example 2, since there is no gas barrier layer, the reflectance after forced deterioration is reduced. Regarding the comparative example 3, it is the layer structure of the back mirror which is the structure of the conventional film mirror. Durability after the forced deterioration test is high, but unlike other configurations, the adhesive layer and the acrylic resin layer are present, so the initial reflectance is low. In solar thermal power generation plants, even if the reflectivity is small, the amount of power generation is greatly reduced. Therefore, the difference in the initial reflectivity of several percent has a great effect. That is, by the above-described means of the present invention, it is possible to prevent a decrease in regular reflectance due to deterioration of the silver reflection layer, and to be lightweight and flexible, to reduce the manufacturing cost, to increase the area and to mass-produce, weather resistance and It can be seen that a film mirror having excellent antifouling properties and good regular reflectance for sunlight can be provided.

DESCRIPTION OF SYMBOLS 1 Support body 2 Adhesion layer 3 Resin base material 4 Anchor layer 5 Metal reflective layer (silver reflective layer)
6 Corrosion prevention layer 7 UV absorption layer 8 Gas barrier layer 9 Antifouling hard coat layer 10 Adhesive layer 11 Acrylic resin layer

Claims (9)

  A film mirror having a metal reflecting layer on a resin base material, the light reflecting side of the metal reflecting layer having no layer provided by bonding a resin film on the light incident side of the metal reflecting layer A film mirror comprising an inorganic gas barrier layer between the outermost layer on the side and the metal reflective layer.   The film mirror according to claim 1, wherein the inorganic gas barrier layer contains a metal oxide selected from silicon oxide, aluminum oxide, and a binary mixture of silicon oxide and aluminum oxide.   The film mirror according to claim 1 or 2, further comprising an antifouling hard coat layer as an outermost layer laminated on the light incident side of the inorganic gas barrier layer.   The film mirror according to any one of claims 1 to 3, wherein the metal reflective layer is made of a metal thin film containing silver as a main component.   The ultraviolet absorber is contained in any one of the film mirror constituent layers provided by being laminated on the light incident side of the resin base material. The film mirror described in 1.   The corrosion inhibitor layer adjacent to the metal reflective layer, and the corrosion inhibitor layer is a thioether, thiol, benzotriazole, imidazole, oxazole, tetrazaindene, pyrimidine, and thiadiazole The film mirror according to any one of claims 1 to 5, comprising a compound selected from a series compound.   The film mirror according to any one of claims 1 to 6, further comprising an adhesive layer on a surface opposite to the light incident side of the resin base material.   It is a manufacturing method of the film mirror which manufactures the film mirror as described in any one of Claim 1- Claim 7, Comprising: It has the process of forming the said metal reflective layer by silver vapor deposition, The film mirror characterized by the above-mentioned. Manufacturing method.   A film mirror according to any one of claims 1 to 7, wherein the film mirror for sunlight condensing is provided on a support.