WO2011096320A1 - フィルムミラー、太陽熱発電用フィルムミラー及び太陽光発電用反射装置 - Google Patents
フィルムミラー、太陽熱発電用フィルムミラー及び太陽光発電用反射装置 Download PDFInfo
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- WO2011096320A1 WO2011096320A1 PCT/JP2011/051566 JP2011051566W WO2011096320A1 WO 2011096320 A1 WO2011096320 A1 WO 2011096320A1 JP 2011051566 W JP2011051566 W JP 2011051566W WO 2011096320 A1 WO2011096320 A1 WO 2011096320A1
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- film mirror
- layer
- film
- power generation
- mirror
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
- F24S23/82—Arrangements for concentrating solar-rays for solar heat collectors with reflectors characterised by the material or the construction of the reflector
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
- F24S23/77—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with flat reflective plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
- F24S23/79—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with spaced and opposed interacting reflective surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
- G02B5/0808—Mirrors having a single reflecting layer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
- F24S2023/86—Arrangements for concentrating solar-rays for solar heat collectors with reflectors in the form of reflective coatings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
Definitions
- the present invention relates to a solar power generation film mirror and a solar power generation reflector using the film mirror, and in particular, has excellent antifouling properties and weather resistance and maintains a good regular reflectance for sunlight for a long period of time.
- the present invention relates to a solar power generation film mirror and a solar power generation reflector using the film mirror.
- solar thermal power generation in which sunlight is reflected / condensed by a mirror and generated heat 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.
- High mirror reflectivity is required to increase the power generation efficiency of solar thermal power generation. For this reason, it is preferable to use silver having the highest reflectance among the metals as the reflecting surface of the mirror, but it has a drawback that it is easily corroded by environmental factors. For this reason, a thick resin layer is provided between the sunlight incident side and the silver surface so as to protect silver.
- a solar thermal power plant is constructed in an area with a large amount of solar radiation such as a desert.
- the problem is that dust falls on the mirror surface and the reflectance decreases with time.
- a large amount of dew condensation water is generated on the mirror surface in the morning in some areas, sand and soil are mixed in the dew condensation water, and the dirt is strongly attached to the mirror surface by drying. Reflectivity decreases.
- the resin layer is provided on the outermost surface layer, the surface is strongly charged and dirt is easily adsorbed. Therefore, in the plant currently under construction, water is regularly sprayed on the mirror surface, and then it is rubbed with a brush to remove dirt.
- Film mirrors for solar power generation are lightweight and flexible, and have the feature that they can reduce the manufacturing cost and increase the area and mass production.
- the film mirror surface is heavily polluted by the dust, and there is almost no rain. If it is installed in an environment where it does not fall for a long time, the regular reflectance will decrease.
- the surface is strongly charged and extra dirt is likely to adhere.
- the specular reflectance is partially recovered by washing away the contamination with a brush or the like, but the surface is damaged by the cleaning, and the specular reflectance is lower than the initial state.
- the problem of the present invention is that even if it is installed in such a harsh environment for a long period of time, the decrease in regular reflectance due to contamination is small, it is difficult to be damaged by dust and washing, and good regular reflectance for sunlight. It is providing the reflecting device for solar power generation using the film mirror and its manufacturing method which can be kept for a long time, and the film mirror.
- a film mirror having a resin base and a silver reflecting layer provided on at least one surface of the resin base, the film mirror having an outermost layer on a light incident side, and an electric surface on the surface of the outermost layer
- the resistance value is 1.0 ⁇ 10 ⁇ 3 to 1.0 ⁇ 10 9 ⁇ ⁇ ⁇ , and the number of scratches in a steel wool test with a pencil hardness of H or more and less than 6H and a weight of 500 g / cm 2 is 30 or less.
- the film mirror for solar power generation is pasted on the metal substrate via the adhesive layer.
- the present invention even if it is left in an environment where it does not rain, such as a desert suitable for solar thermal power generation, it is difficult to get dirty, it is excellent in scratch resistance even when washed with a brush, and it is good for sunlight over a long period of time. It is possible to provide a film mirror having a regular reflectance, a manufacturing method thereof, and a solar power generation reflection device using the film mirror.
- FIG. It is a schematic diagram of the regular reflectance measuring apparatus.
- the film mirror according to the present invention has an electric resistance value of 1.0 ⁇ 10 ⁇ 3 to 1 on a resin base material, at least as a constituent layer, a silver reflecting layer and an outermost layer (outermost layer on the side where incident light is incident). 0.0 ⁇ 10 9 ⁇ ⁇ ⁇ , pencil hardness of H to less than 6H, and a weight of 500 g / cm 2 in a steel wool test having 30 or less scratches.
- the film mirror is in the form of a back mirror and a front mirror.
- the film mirror as a film mirror for solar power generation, and when the sunlight incident side is a front, as shown in FIG. As shown in FIG. 2A, the surface mirror on the back side is also established as a film mirror for solar power generation.
- the outermost layer since the outermost layer exhibits antistatic properties and dirt is difficult to adhere, it is estimated that the dirt attached to the surface is removed by a force such as wind. Nevertheless, since this film mirror is used in a desert-like environment, if it is used for a long period of time, the adhesion of dirt centering on dust cannot be removed, and high reflectance cannot be maintained.
- the electric resistance value of the outermost layer is 1.0 ⁇ 10 ⁇ 3 to 1.0 ⁇ 10 9 ⁇ ⁇ ⁇ from the viewpoint of manifesting the effects of the present invention.
- an adhesive layer is provided between the resin base material and the silver reflective layer to enhance the adhesiveness between the resin base material and the silver reflective layer.
- the corrosion prevention layer contains a silver adsorptive corrosion inhibitor (a corrosion inhibitor having an adsorptive group for silver). It is also preferred that the corrosion inhibitor is an antioxidant.
- a gas barrier layer is provided on the surface side of the corrosion prevention layer.
- the surface side of the corrosion prevention layer has an ultraviolet absorber layer, or any one of the constituent layers provided on the surface side of the silver reflective layer may contain an ultraviolet absorber. preferable.
- the thickness of the entire layer including the resin base material is preferably in the range of 75 to 250 ⁇ m.
- the method for producing a film mirror according to the present invention is preferably a production method of an embodiment having a step of forming the silver reflective layer by silver vapor deposition.
- the film mirror according to the present invention is a film mirror that has at least a silver reflection layer 22 as a constituent layer on the resin base material 1 and the outermost layer 23 on the surface side has both conductivity and scratch resistance. To do.
- a gas barrier layer 26 an ultraviolet absorption layer 27, a corrosion prevention layer 25, and a protective layer 24 as the constituent layers.
- an adhesive layer may be provided between the resin base material 21 and the silver reflective layer 22 and between the resin base material 21 and the corrosion prevention layer 24 to enhance the adhesion between the layers.
- the outermost layer 23 is a hard coat layer having a pencil hardness of H or more and less than 6H and a scratch of 30 or less in a steel wool test with a weight of 500 g / cm 2. The pencil hardness is more preferably 2H or more and 6H or less. .
- the outermost layer 23 is preferably a hard coat antistatic layer to which an antistatic agent is added.
- the protective layer 24 functions as a corrosion prevention layer or an antioxidant layer by adding a corrosion inhibitor or an antioxidant.
- the corrosion prevention layer 5 can also be made into an antioxidant layer by adding an antioxidant.
- FIG. 1B shows a case where a gas barrier layer 26 is further provided
- FIG. 1C shows a case where an ultraviolet absorbing layer 27 is provided thereon.
- the gas barrier layer is intended to prevent the deterioration of humidity, in particular, deterioration of the resin base material and various functional elements protected by the resin base material due to high humidity, but has a special function and application. As long as the above characteristics are maintained, various types of gas barrier layers can be provided. In the present invention, it is preferable to provide a gas barrier layer between the corrosion prevention layer 25 and the resin base material 21.
- the water vapor permeability at 40 ° C. and 90% RH is 100 g / m 2 ⁇ day / ⁇ m or less, preferably 50 g / m 2 ⁇ day / ⁇ m 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 / ⁇ m.
- the oxygen permeability is preferably 0.6 ml / m 2 / day / atm (1 atm is 1.01325 ⁇ 10 5 Pa) 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.
- the inorganic oxide contained in the gas barrier layer of the present invention is preferably formed from a sol using an 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).
- silicon oxide aluminum oxide, zirconium oxide and the like. Of these, silicon oxide is preferable.
- the inorganic oxide 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
- the polysilazane method is a method of forming an inorganic oxide from a polysilazane that is a precursor of an inorganic oxide.
- 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.
- 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).
- 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).
- 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- A lower alkyl group such as C 4 H 9 (hereinafter referred to as i-Bu) is 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 alkoxide
- the “sol-gel method” is to obtain a hydroxide sol by hydrolyzing an organometallic compound, etc., dehydrate it into a gel, and further heat-treat 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.
- an inorganic oxide by a sol-gel method having the following steps.
- the organometallic compound in a reaction solution containing at least water and an organic solvent, 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 fine pores 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.
- the organometallic compound used as a raw material is not particularly limited as long as it can be hydrolyzed, and preferred organometallic compounds include the metal alkoxides. .
- 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.
- 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.
- the metal when the metal is Ca, Mg, Al or the like, it reacts with water in the reaction solution to form a hydroxide, or when carbonate ion CO 3 2- is present, a carbonate is formed. 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 solution 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.
- 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.
- the water ratio is preferably in the range of 0.2 to 50 mol / L as the concentration of water.
- an organometallic compound is hydrolyzed in the reaction solution in the presence of boron ions using a halogen ion as a catalyst.
- 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.
- the B 3+ ion concentration in the reaction solution is preferably in the range of 1.0 to 10.0 mol / L.
- 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.
- 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. If the halogen ion concentration exceeds 2 mol / kg, the resulting inorganic matrix (metal oxide glass) tends to be non-uniform, which is not preferable.
- 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
- 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.
- 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,
- 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 the mixture by adjusting it to the range of 4.5 to 5. In this case, for example, it is convenient to use a mixture of methyl red and bromocresol green as an indicator.
- the main component solution having the same concentration of the same component and the reaction solution including B 3+ and halogen ions
- 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
- the concentration of halogen ions is in the range of ⁇ 30% by mass. Can be changed.
- reaction product reaction solution after aging
- reaction solution after aging reaction solution after aging
- the temperature is raised gradually while paying particular attention to a temperature range of 50 to 70 ° C., followed by a preliminary drying (solvent volatilization) step and further raising the temperature.
- 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 the polysilazane represented by the following formula (I) and an organic solvent is applied and removed by evaporating the solvent. A polysilazane layer having a layer thickness of 0.05 to 3.0 ⁇ m is left on the resin substrate, and the above-described polysilazane layer is present in an atmosphere containing water vapor in the presence of oxygen, active oxygen, and optionally nitrogen. It is preferable to employ a method of forming a glass-like transparent film on the resin substrate by locally heating.
- a solution containing a catalyst as necessary in the polysilazane represented by the following formula (I) and an organic solvent is applied and removed by evaporating the solvent.
- a polysilazane layer having a layer thickness of 0.05 to 3.0 ⁇ m is left on the resin substrate, and the above-described polysilazane layer is present in an atmosphere containing water vapor
- R 1 , R 2 , and R 3 are the same or different and independently of one another, hydrogen, or an optionally substituted alkyl group, aryl group, vinyl group or (trialkoxysilyl) alkyl group, Preferably selected from the group consisting of hydrogen, methyl, ethyl, propyl, iso-propyl, butyl, iso-butyl, tert-butyl, phenyl, vinyl or 3- (triethoxysilyl) propyl, 3- (trimethoxysilylpropyl)
- n is an integer and n is determined such that the polysilazane has a number average molecular weight of 150 to 150,000 g / mol.
- 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.
- a solution containing perhydropolysilazane in which all of R 1 , R 2 and R 3 are hydrogen atoms is used.
- the coating according to the invention comprises at least one polysilazane of the formula (III)
- R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are independently of each other hydrogen, or optionally substituted alkyl, aryl, vinyl, or (trialkoxysilyl) Represents an alkyl group, where n and p are integers, and n is determined such that the polysilazane has a number average molecular weight of 150 to 150,000 g / mol.
- 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 formula (IV) is also preferable.
- 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
- 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 proportion of polysilazane in the solvent is generally 1 to 80% by mass, preferably 5 to 50% by mass, and particularly preferably 10 to 40% by mass.
- 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.
- aprotic solvent which 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.
- the additional component of the polysilazane solution can be a further binder such as those conventionally used in the manufacture of paints.
- 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 .
- the thickness of the film to be formed is preferably in the range of 10 nm to 2 ⁇ m.
- the outermost layer of the film mirror has an antistatic property with an electric resistance value of 1.0 ⁇ 10 ⁇ 3 to 1.0 ⁇ 10 9 ⁇ ⁇ ⁇ , a pencil hardness of H or more and less than 6H, weight
- the pencil hardness is 2H or more and 6H because it has a high reflectance after being exposed outdoors and washed with a brush. Less than is preferable.
- a method for producing a layer having a high hardness that can be applied to the outermost surface of the film mirror a method using a resin having a high hardness, a method using an inorganic film, a method for curing the resin by heat or ultraviolet rays, and the olefin side chain is modified to the resin.
- a method in which inorganic particles are contained and cured by heat or ultraviolet rays is a method in which inorganic particles are contained and cured by heat or ultraviolet rays.
- Antistatic techniques include a method of reducing electrical resistance by dispersing conductive filler, a method using a conductive polymer, a method of dispersing or coating a metal compound on the surface, anions such as organic sulfonic acid and organic phosphoric acid Internal addition method using functional compound, polyoxyethylene alkylamine, polyoxyethylene alkenylamine, method using surface active type low molecular weight antistatic agent in glycerin fatty acid ester building, dispersing conductive filler such as carbon black There are methods.
- Examples of the conductive filler include metal fine particles and conductive inorganic oxide fine particles.
- Examples of the metal fine particles include gold, silver, palladium, ruthenium, rhodium, osmium, iridium, tin, antimony, and indium.
- inorganic oxide fine particles examples include indium antimony pentoxide, tin oxide, zinc oxide, ITO (indium tin oxide), ATO (antimony tin oxide), and phosphorus-doped oxide. Fine particles are preferred from the viewpoints of high conductivity and transparency, and high hardness of the outermost layer.
- inorganic double oxide fine particles examples include ITO (indium tin oxide), ATO (antimony tin oxide), antimony pentoxide / zinc oxide double oxide, and phosphorus-doped acid value tin.
- coating resistance can be broadly divided into particle internal resistance and contact resistance.
- the internal resistance of the particles is affected by the amount of doping / oxygen defects of different metals and crystallinity.
- the contact resistance is affected by the particle diameter and shape, the dispersibility of the fine particles in the paint, and the conductivity of the binder resin. Since a film having a relatively high conductivity is considered to have a larger influence of contact resistance than internal resistance of the particle, it is important to form a conductive path by controlling the particle state.
- the primary particle diameter is preferably 1 to 100 nm, and particularly preferably 1 to 50 nm.
- the particles In order to ensure conductivity, the particles must be close to each other to some extent, so that the particle diameter is preferably 1 nm or more. If it exceeds 100 nm, light is reflected and the transmittance is lowered.
- Examples of the conductive polymer include polyacetylene, polyparaphenylene, polyaniline, polythiophene, polyparaphenylene vinylene, and polypyrrole.
- the film can be formed by a vacuum film forming method, and examples thereof 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.
- Step wool test In the steel wool test, a # 0000 steel wool was used as the functional layer surface of the sample, a load of 500 g was applied to the steel wool cut into 1 cm 2 , and the film was rubbed back and forth a predetermined number of times at a stroke of 100 mm and a speed of 30 mm / sec. This is a method of visually observing and evaluating the subsequent surface.
- Electrode resistance value Measured in accordance with JIS K 7194 standard. However, the sample is left in an environment of 50% humidity and 50 ° C. for 2 hours or more, and then measured at five points with a probe (Mitsubishi Chemical ASP probe) having a probe interval of 5 mm in which the measurement samples are arranged in a straight line at equal intervals. The five-point average value is taken as the electric resistance value.
- a probe Mitsubishi Chemical ASP probe
- the outermost layer has a contact angle of 0 ° to 70 ° and a pencil hardness of H to 6H. Furthermore, it is also a preferred embodiment that the outermost layer has a water contact angle of 0 ° to 50 ° and a pencil hardness of H to 6H, and the outermost layer has a water contact angle of 0 ° to 30 °.
- the pencil hardness has a characteristic of H or more and 6H or less.
- the outermost layer is formed as an outermost layer by adjusting the hydrophilicity of the gas barrier layer.
- the hydrophilic outermost layer will be further described.
- a method of orienting hydroxyl groups on the surface and a method of forming a fine shape on the surface as the hydrophilic layer.
- 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 a hydroxyl group, a solution in which a functional group present on the film surface is substituted with a hydroxyl group
- methods such as a coating method, surface treatment and fine processing.
- Examples of materials that can be used as the outermost layer include a photo-curing hydrophilic acrylic resin film (Japanese Patent Laid-Open No. 7-48148), an acrylate resin composition, and an aqueous colloidal silica-containing acrylic resin (Japanese Patent Laid-Open No. 2005-66824).
- Polyurethane resin compositions Japanese Patent Laid-Open No. 2005-110918
- resin films using an aqueous silicone compound as a binder Japanese Patent Laid-Open No.
- photocatalytic oxide-containing silica films such as titanium oxide or alumina
- a photocatalytic film such as titanium oxide or niobium oxide having a high aspect ratio
- Patent Laid-Open No. 2009-62216 Japanese Patent Laid-Open No. 2009-62216
- a photocatalyst-containing fluororesin coating Patent Laid-Open No. 2009-62216
- Patentex Technologies a photocatalyst-containing fluororesin coating
- an organic / inorganic polysilazane film an organic / inorganic polysilazane hydrophilization accelerator Using (AZ Electronics) Film, and the like.
- hydrophilicity can be promoted by surface treatment.
- examples thereof include corona treatment (Japanese Patent Laid-Open No. 11-172028), plasma surface treatment, ultraviolet / ozone treatment, surface protrusion formation (2009-226613), surface fine processing treatment, and the like.
- Silver reflection layer As a method for forming the silver reflective layer, 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.
- 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.
- sputtering method a vapor deposition method capable of a roll-to-roll method for continuously forming a film is preferably used in the present invention. That is, it is preferable that the manufacturing method of the film mirror for solar power generation is a manufacturing method of an aspect including a step of forming the silver reflective layer by silver vapor deposition.
- the thickness of the silver reflective layer is preferably 10 to 200 nm, more preferably 30 to 150 nm, from the viewpoint of reflectivity and the like.
- the silver reflective layer may be on the light incident side (front surface side) or on the opposite side (rear surface side) with respect to the resin base material. For the purpose of preventing deterioration, it is preferable to be positioned on the light incident side.
- resin base material various publicly known resin films can be used.
- polyester film or an acrylic film 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 depending on the type and purpose of the resin. For example, it is generally in the range of 10 to 300 ⁇ m. The thickness is preferably 20 to 200 ⁇ m, more preferably 30 to 100 ⁇ m.
- the adhesive layer is not particularly limited as long as it has a function of improving the adhesion between the silver reflective layer or the metal layer and the resin base material. Therefore, the adhesive layer has adhesiveness for closely adhering the resin base material to the silver reflective layer or the metal layer, heat resistance that can withstand heat when the silver reflective layer or the metal layer is formed by a vacuum deposition method, and the like. Smoothness is required to bring out the high reflection performance inherent in the reflective layer.
- the thickness of the adhesive layer is preferably from 0.01 to 3 ⁇ m, more preferably from 0.1 to 1 ⁇ m, from the viewpoints of adhesion, smoothness, reflectivity of the reflecting material, and the like.
- 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 alone or mixed resins thereof. From the viewpoint of weather resistance, polyester resins and melamine resins are preferred. It is more preferable to use a thermosetting resin in which a curing agent such as isocyanate is further mixed.
- a 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.
- 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.
- various vacuum film forming methods such as silicon oxide, aluminum oxide, silicon nitride, aluminum nitride, lanthanum oxide, and lanthanum nitride.
- the corrosion prevention layer is preferably provided adjacent to the silver reflection layer, and contains a corrosion inhibitor for silver.
- a corrosion inhibitor having an adsorptive group for silver and a corrosion inhibitor having an antioxidant ability are preferably used.
- corrosion refers to a phenomenon in which metal (silver) is chemically or electrochemically eroded or deteriorated by the environmental material surrounding it (see JIS Z0103-2004).
- the film mirror for solar power generation is an aspect in which the corrosion prevention layer contains a corrosion inhibitor or an antioxidant having an adsorptive group for silver.
- the optimum amount of the corrosion inhibitor varies depending on the compound to be used, but generally it is preferably in the range of 0.1 to 1.0 / m 2 .
- Corrosion inhibitor 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, indazole It is desirable to select from a compound having a ring, a copper chelate compound, a thiourea, a compound having a mercapto group, at least one kind of naphthalene, or a mixture thereof.
- 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-ethoxychrysoidine, dicyclohexylammonium nitrite, dicyclohexylammonium salicylate, monoethanolamine benzoate, dicyclohexylammonium benzoate, diisopropyl Ammonium benzoate, diisopropylammonium nitrite , Cyclohexylamine carbamate, nitronaphthalene nitrite, cyclohexylamine benzoate, dicyclohexylamine
- 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
- 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, etc. Or a mixture thereof.
- Compounds 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 Formylimidazole, 4-methyl-5-formylimidazole, 2-ethyl-4-methyl-5-formylimidazole, 2-phenyl-4-methyl-4-formylimidazole, 2-mercaptobenzimidazole, etc., or These mixtures are mentioned.
- Examples of the compound having an indazole ring include 4-chloroindazole, 4-nitroindazole, 5-nitroindazole, 4-chloro-5-nitroindazole, and a mixture thereof.
- copper chelate compounds include acetylacetone copper, ethylenediamine copper, phthalocyanine copper, ethylenediaminetetraacetate copper, hydroxyquinoline copper, and the like, or a mixture thereof.
- thioureas examples include thiourea, guanylthiourea, and the like, or a mixture thereof.
- mercaptoacetic acid thiophenol, 1,2-ethanediol, 3-mercapto-1,2,4-triazole, 1-methyl-3-mercapto
- naphthalene-based compounds examples include thionalide.
- an antioxidant can also be used.
- the antioxidant it is preferable to use a phenol-based antioxidant, a thiol-based antioxidant, and a phosphite-based antioxidant.
- phenolic antioxidants examples 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-t-butylphenol), 4,4'-butylidenebis (3-methyl-6-t-butylphenol), 1,3,5-tris (3', 5'-di-t -Butyl-4'-hydroxybenzyl) -S-triazine-2,4,6- (1H, 3H, 5H) trione, stearyl- ⁇ - (3,5-di-t-butyl-4-hydroxyphenyl) propi , Triethylene glycol bis [3- (3-
- thiol-based antioxidant examples include distearyl-3,3′-thiodipropionate, pentaerythritol-tetrakis- ( ⁇ -lauryl-thiopropionate), and the like.
- phosphite antioxidant examples 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.
- the antioxidant and the following light stabilizer can be used in combination.
- hindered amine light stabilizer examples 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-t-butyl-4-hydroxyphenyl) propionyloxy] -2,2,6,6-tetramethylpiperidine, 4-benzoyloxy-2,2,6 6-Tetrame Lupiperidine, tetrakis (2,2,6,6
- a hindered amine light stabilizer containing only a tertiary amine is preferable.
- bis (1,2,2,6,6-pentamethyl-4-piperidyl) is preferable.
- a condensate of 1,2,2,6,6-pentamethyl-4-piperidinol / tridecyl alcohol and 1,2,3,4-butanetetracarboxylic acid is preferred.
- a nickel-based UV stabilizer can also be used as the light stabilizer.
- 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.
- the metal layer which uses a metal with a higher ionization tendency than silver in the form adjacent to silver can be provided.
- the metal layer which uses a metal with a higher ionization tendency than silver in the form adjacent to silver.
- aluminum, zinc, iron, tin, and copper are preferable.
- the method for producing the metal layer may be formed by a wet method generally referred to as a plating method, and it is preferable to use the vacuum film forming method, although the above-described vacuum film forming method is used.
- the film thickness of the metal layer is in the range of 10 ⁇ m to 500 ⁇ m in consideration of the sacrificial anticorrosive function of silver.
- the thickness is preferably 50 to 300 ⁇ m, more preferably 100 to 200 ⁇ m.
- 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 base material contains an ultraviolet absorber or an ultraviolet absorber layer is provided on the surface side of the corrosion prevention layer.
- ultraviolet absorber examples include benzophenone, benzotriazole, phenyl salicylate, triazine, and the like as organic materials, and titanium oxide, zinc oxide, cerium oxide, iron oxide, and the like as inorganic materials.
- benzophenone ultraviolet absorber examples 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.
- benzotriazole ultraviolet absorber examples 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.
- phenyl salicylate ultraviolet absorber examples include phenylsalicylate, 2-4-di-t-butylphenyl-3,5-di-t-butyl-4-hydroxybenzoate, and the like.
- hindered amine ultraviolet absorber examples include bis (2,2,6,6-tetramethylpiperidin-4-yl) sebacate.
- triazine ultraviolet absorbers examples 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-tria 2,4-diphenyl-6- (2-hydroxy-4-dodecyloxy
- 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. 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.
- the amount of the ultraviolet absorber used is 0.1 to 20% by mass, preferably 1 to 15% by mass, and more preferably 3 to 10% by mass. When the amount is more than 20% by mass, the adhesion is deteriorated.
- the total thickness of the film mirror according to the present invention is preferably 75 to 250 ⁇ m, more preferably 90 to 230 ⁇ m, and still more preferably 100 to 220 ⁇ m, from the viewpoints of prevention of deflection of the mirror, regular reflectance, handling properties, and the like.
- Example 1 (Preparation of film mirror 1)
- an acrylic resin film Mitsubishi Rayon Acryprene HBS006, thickness 75 ⁇ m
- a polyester resin Polyamide (Polyester SP-181, manufactured by Nippon Synthetic Chemical) and TDI (tolylene diisocyanate) -based isocyanate (Cosmonate TDI100, manufactured by Mitsui Takeda Chemical Co., Ltd.) at a resin solid content ratio of 10: 2 on one side of the acrylic resin film.
- methyl ethyl ketone was added as a solvent, and glycol dimercaptoacetate (manufactured by Wako Pure Chemical Industries) as a corrosion inhibitor was mixed in an amount adjusted to 0.05 g / m 2 and coated by gravure coating method. A 100 nm thick corrosion prevention layer 25 was formed. Subsequently, the silver reflective layer 22 was deposited on the corrosion prevention layer to 150 nm by vacuum deposition. Next, a 20 nm thick protective layer 24 having the same composition as the corrosion inhibitor layer was formed on the silver reflective layer.
- conductive polymer resin Naagase Chemtech Co., Ltd., Denatron P-502S
- polyurethane resin HEPCE CHEM Co., Ltd., HM-200
- epoxy crosslinking agent Nagase Chemtech Co., Ltd.
- DENACOL EX-614 150 parts by mass of tetrafluoroethylene (manufactured by DuPont, Teflon (registered trademark) AF) as a fluorine-based resin were mixed in water to prepare an antistatic coating solution.
- a fluorosurfactant (DIC Corporation, RS-75) having a molecular weight of 3000 to 5000 is used with respect to 100 parts by mass of the coating solution, and the total solid content is 2.
- An antistatic coating solution was prepared so as to be 0% by mass. This was coated on the opposite side of the resin base material 21 provided with the corrosion inhibitor layer 25 by a gravure coating method to form an outermost layer 23 (antistatic layer) having a thickness of 3 ⁇ m, whereby a film mirror 1 was obtained. .
- a biaxially stretched polyester film (polyethylene terephthalate film, thickness 100 ⁇ m) (PET) was used as the resin base material 21.
- Polyester resin Polyethylene terephthalate film, thickness 100 ⁇ m
- TDI tolylene diisocyanate
- Cosmonate TDI100 manufactured by Mitsui Takeda Chemical Co., Ltd.
- the silver reflective layer 22 was deposited to 150 nm by vacuum deposition.
- a 20 nm thick protective layer 24 having the same composition as that of the corrosion preventing layer 25 was formed on the silver reflective layer.
- the antistatic hard coat layer coating solution is applied on the opposite surface of the biaxially stretched polyester film to the surface on which the corrosion prevention layer 25 is formed so that the film thickness after curing is 5 ⁇ m, and ultraviolet rays are applied using an ultraviolet irradiator.
- the outermost layer 23 (antistatic hard coat layer) was prepared and the film mirror 3 was obtained.
- the film mirror 3 was prepared in the same manner as the film mirror 3 except that an acrylic resin film (Acryprene HBS010P manufactured by Mitsubishi Rayon Co., Ltd., thickness 75 ⁇ m) was used as the resin substrate 21 when the film mirror 3 was manufactured. Obtained.
- a gas barrier layer 26 was formed between the resin base material and the corrosion inhibitor layer.
- bar coating was performed on the resin base material so that the thickness of the dried film was 100 nm, and 3 minutes. After natural drying, the film was annealed in an oven at 70 ° C. for 30 minutes to form the gas barrier layer 26, and then the corrosion inhibitor layer of the film mirror 3 was applied and dried. Others were the same as the film mirror 3, and the sample of the film mirror 5 was obtained.
- a polyester resin (Polyester SP-181, manufactured by Nippon Synthetic Chemical) and a TDI (tolylene diisocyanate) isocyanate are provided between the resin substrate and the gas barrier layer.
- Methyl ethyl ketone is added to a resin obtained by mixing Cosmonate TDI100 (manufactured by Mitsui Takeda Chemical Co., Ltd.) with a resin solid content ratio of 10: 2, and 0.01 g / m 2 of benzotriazole (manufactured by BASF) as an ultraviolet absorber.
- a film mirror 8 was produced in the same manner as the film mirror 6 except that the ultraviolet absorber layer 27 having a thickness of 100 nm formed by a gravure coating method was provided.
- the film mirror 11 is the same as the film mirror 11 except that the gas barrier layer 26 used in the film mirror 5 is formed between the protective layer 24 and the outermost layer 23 as shown in FIG. A film mirror 12 was produced.
- a polyester resin (Polyester SP-181 manufactured by Nippon Synthetic Chemical) and a TDI (tolylene diisocyanate) isocyanate are provided between the resin substrate and the gas barrier layer.
- Methyl ethyl ketone is added to a resin obtained by mixing Cosmonate TDI100 (manufactured by Mitsui Takeda Chemical Co., Ltd.) with a resin solid content ratio of 10: 2, and 0.01 g / m 2 of benzotriazole (manufactured by BASF) as an ultraviolet absorber.
- a film mirror 15 was produced in the same manner as the film mirror 14 except that an ultraviolet absorber layer 27 having a thickness of 100 nm formed by a gravure coating method was provided.
- the rate of decrease in regular reflectance is less than 5% 4: The rate of decrease in regular reflectance is 5% or more and less than 10% 3: The rate of decrease in regular reflectance is 10% or more but less than 15% 2: The rate of decrease in regular reflectance 15% or more and less than 20% 1: Decrease rate of regular reflectance is 20% or more ⁇ Pencil hardness test> The test was performed according to the standard of JIS K 5600. A scratch test of the outermost layer surface of each film mirror was performed by applying a load of 500 g with a 45 degree angle of the pencil. Ranking was performed by the hardness symbol of the pencil that was not damaged more than 4 times out of 5 times.
- ⁇ Outdoor exposure test> An adhesive layer is applied on the protective layer of the film mirrors 1 to 10 and on the opposite side of the film mirrors 11 to 15 on which the anti-corrosion layer of the biaxially stretched polyester film is formed. Then, a solar power generation reflection device was prepared and installed in a 10 m square sandbox with an angle of 45 degrees with the ground, left for 180 days, and the reflectance was measured under the above conditions. Moreover, it measured similarly after wash
- the pressure-sensitive adhesive layer coating solution is an acrylic pressure-sensitive adhesive (Lintec Corporation, TL-75K), and the coating film thickness is 50 ⁇ m.
- the configuration of the back mirror is shown, and for Examples 11 to 15, the configuration of the surface mirror is shown.
- the silver reflective layer is very conductive.
- the surface mirror shows a relatively low electrical resistance because the distance between the outermost surface layer and the silver reflecting layer is very close, but in the case of the rear surface mirror, there is a thick resin layer between the outermost surface and the silver reflecting layer. Although the weather resistance is high, electrons cannot reach the silver reflection layer, and the electric resistance value does not decrease so much.
- the film mirror 1 was not hard-coated on the surface, so it was damaged and the reflectance was lowered.
- the reflectance is recovered if it is thoroughly cleaned, but when the film mirror 2 is cleaned in the same manner as the film mirrors 3 to 15, the reflectance is lower than that of the film mirrors 3 to 15 of the present invention.
- the electrical resistance value does not drop that much, but the weather resistance is high, so they maintain the same reflectance as the surface mirrors even after outdoor exposure. Has a low electrical resistance, but weather resistance is lower than that of a rear-view mirror.
- the film mirror 3 containing inorganic double oxide fine particles in the outermost layer shows the same or slightly larger electric resistance value as the film mirror 10 containing no inorganic double oxide fine particles, but has excellent hardness, and therefore, is washed after outdoor exposure. It can be seen that the reflectivity is high.
- the reflectance of sunlight can be maintained for a long time by adjusting the hardness and electric resistance value of the outermost layer surface of the film mirror. 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.
- FIG. 3A shows the configuration of Comparative Example 1.
- a biaxially stretched polyester film (polyethylene terephthalate film, thickness 100 ⁇ m) was used.
- a mixture obtained by mixing lanthanum oxide and aluminum oxide at 8: 2 was vapor-deposited to a thickness of 60 nm by a vacuum vapor deposition method to obtain an adhesive layer 2.
- a metal layer 3 having a thickness of 100 nm was formed by vacuum deposition of copper, and a silver reflective layer 4 was similarly deposited to be 150 nm.
- a polyester resin and TDI (tolylene diisocyanate) isocyanate are mixed at a resin solid content ratio of 10: 2 on the silver reflection layer, methyl ethyl ketone is added as a solvent, and glycol dimercaptoacetate (sum) is added as a corrosion inhibitor.
- An amount adjusted to 0.05 g / m 2 was mixed and coated by a gravure coating method to form a corrosion prevention layer 5 having a thickness of 100 nm.
- FIG. 3B shows the configuration of Comparative Example 2.
- Fig. 4 (a) shows the configuration of Reference Examples 1-5.
- a biaxially stretched polyester film (polyethylene terephthalate film, thickness 100 ⁇ m) was used as the resin substrate.
- a mixture of lanthanum oxide and aluminum oxide mixed at 8: 2 was deposited to a thickness of 60 nm by vacuum deposition, and then a metal layer having a thickness of 100 nm was deposited by vacuum deposition of copper.
- a silver reflective layer was deposited to a thickness of 150 nm.
- Polyester resin and TDI isocyanate are mixed at a resin solid content ratio of 10: 2 on the silver reflection layer, methyl ethyl ketone is added as a solvent, and glycol dimercaptoacetate (manufactured by Wako Pure Chemical Industries) is added as a corrosion inhibitor.
- An amount adjusted to be 05 g / m 2 was added and coated by a gravure coating method to form a corrosion prevention layer 5 having a thickness of 100 nm.
- OPSTAR Z7537 (JSR) was applied in a thickness of 5 ⁇ m, and cured by ultraviolet irradiation to form the outermost layer 7 having antifouling properties and scratch resistance, whereby a sample of Reference Example 1 was obtained.
- Reference Example 2 A sample of Reference Example 2 was obtained with the layer structure of Reference Example 1 except that an acrylic resin film (Acryprene HBS006, 100 ⁇ m) was used as the base material of the sample of Reference Example 1.
- an acrylic resin film (Acryprene HBS006, 100 ⁇ m) was used as the base material of the sample of Reference Example 1.
- Reference Example 3 gas barrier properties were imparted to the outermost layer.
- the thickness of the film after drying is 100 nm.
- annealing was performed in an oven at 70 ° C. for 30 minutes to obtain an outermost layer 7 having gas barrier properties.
- Others were the same as in Reference Example 1, and a sample of Reference Example 3 was obtained.
- Reference Example 4 In Reference Example 3, the hydrophilicity of the outermost layer 7 having gas barrier properties was improved by applying a “hydrophilization accelerator” (product name) manufactured by AZ Electronics on the outermost layer having gas barrier properties. Similarly, a sample of Reference Example 4 was obtained.
- Reference Example 5 In Reference Example 4, 2,2′-methylenebis (4,6-di-t-butylphenyl) octyl phosphite (antioxidation prevention) was used instead of glycol dimercaptoacetate (silver-adsorbing corrosion inhibitor) in the corrosion prevention layer 5.
- the sample of Reference Example 5 was produced in the same manner as in Reference Example 4 except that 0.01 g / m 2 was added.
- FIG. 4B shows the configuration of Reference Examples 6 and 7.
- Reference Example 6 In Reference Example 4, methyl ethyl ketone was added to a resin in which a polyester resin and TDI (tolylene diisocyanate) isocyanate were mixed at a resin solid content ratio of 10: 2 on the corrosion prevention layer 5, and benzotriazole as an ultraviolet absorber. It was contained so that 0.01 g / m 2, providing an ultraviolet absorber layer 10 having a thickness of 100nm was formed by a gravure coating method, similarly except that the outermost layer 7 provided thereon, of reference example 6 A sample was made.
- TDI tolylene diisocyanate
- Reference Example 7 Reference Example 6 except that biaxially stretched polyester film (polyethylene terephthalate film, thickness 100 ⁇ m) was replaced with biaxially stretched polyester film (polyethylene terephthalate film, thickness 175 ⁇ m) as resin base material 1 in Reference Example 6. A sample of Reference Example 7 was produced by the same method as described above.
- FIG. 5 shows a method for measuring regular reflectance.
- (A) is arrangement
- (b) is arrangement
- Reference numeral 15 denotes an integrating sphere.
- ⁇ Weather resistance test for regular reflectance> The regular reflectance of the film mirror after being allowed to stand for 30 days under the conditions of a temperature of 85 ° C. and a humidity of 85% RH under irradiation with a xenon lamp is measured by the same method as the above-mentioned light reflectance measurement. From the reflectance and the regular reflectance of the film mirror after forced degradation, the rate of decrease in regular reflectance before and after the forced degradation test was calculated. The evaluation criteria for the weather resistance test are described below.
- the rate of decrease in regular reflectance is less than 5% 4: The rate of decrease in regular reflectance is 5% or more and less than 10% 3: The rate of decrease in regular reflectance is 10% or more but less than 15% 2: The rate of decrease in regular reflectance 15% or more and less than 20% 1: Decrease rate of regular reflectance is 20% or more.
- ⁇ Pencil hardness test> The test was performed according to the standard of JIS K 5600. A scratch test was performed on the surface of each film mirror sample with a pencil angle of 45 degrees and a load of 500 g. Ranking was performed by the hardness symbol of the pencil that was not damaged more than 4 times out of 5 times.
- Comparative Example 1 was damaged because the surface did not have a hard coat property, and the reflectance decreased.
- Comparative Example 2 the reflectivity was recovered if it was thoroughly washed, but when it was washed in the same manner as in the reference example, the reflectivity was lower than that of the example.
- 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.
- the outermost surface layer having a water contact angle of 30 ° or less it can be seen that the decrease in reflectance is small even when cleaning is not performed.
- SYMBOLS 1 Resin base material 2 Adhesive layer 3 Metal layer 4 Silver reflection layer 5 Corrosion prevention layer 6 Gas barrier layer 7 Outermost layer (antifouling property and scratch resistance) 8 outermost layer (antifouling property) 9 outermost layer (scratch resistance) DESCRIPTION OF SYMBOLS 10 Ultraviolet absorber layer 21 Resin base material 22 Silver reflection layer 23 Outermost layer 24 Protective layer 25 Corrosion prevention layer 26 Gas barrier layer 27 Ultraviolet absorption layer
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Abstract
Description
本発明に係るフィルムミラーの構成の概要について、図1(a)を用いて説明する。
前記ガスバリア層は、湿度の変動、特に高湿度による樹脂基材及び当該樹脂基材で保護される各種機能素子等の劣化を防止するためのものであるが、特別の機能・用途を持たせたものであっても良く、上記特徴を維持する限りにおいて、種々の態様のガスバリア層を設けることができる。本発明においては、前記腐食防止層25と樹脂基材21の間に、ガスバリア層を設けることが好ましい。
本発明の前記ガスバリア層に含まれる無機酸化物は、有機金属化合物を原料とするゾルから局所的加熱により形成されたものが好ましい。したがって、有機金属化合物に含有されているケイ素(Si)、アルミニウム(Al)、ジルコニウム(Zr)、チタン(Ti)、タンタル(Ta)、亜鉛(Zn)、バリウム(Ba)、インジウム(In)、スズ(Sn)、ニオブ(Nb)等の元素の酸化物である。
前記ガスバリア層は、加熱により無機酸化物を形成する前駆体を塗布した後に、一般的な加熱方法が適用して形成することできるが、局所的加熱により形成することが好ましい。該前駆体は、ゾル状の有機金属化合物又はポリシラザンが好ましい。
前記有機金属化合物は、ケイ素(Si)、アルミニウム(Al)、リチウム(Li)、ジルコニウム(Zr)、チタン(Ti)、タンタル(Ta)、亜鉛(Zn)、バリウム(Ba)、インジウム(In)、スズ(Sn)、ランタン(La)、イットリウム(Y)、及びニオブ(Nb)のうちの少なくとも一つの元素を含有することが好ましい。特に、当該有機金属化合物が、ケイ素(Si)、アルミニウム(Al)、リチウム(Li)、ジルコニウム(Zr)、チタン(Ti)、亜鉛(Zn)、及びバリウム(Ba)のうちの少なくとも一つの元素を含有することが好ましい。さらに、ケイ素(Si)、アルミニウム(Al)、及びリチウム(Li)のうちの少なくとも一つの元素を含有することが好ましい。
前記一般式(I)において、Mは、酸化数nの金属を表す。R1及びR2は、各々独立に、アルキル基を表す。mは、0~(n-1)の整数を表す。R1及びR2は、同一でもよく、異なっていてもよい。R1及びR2としては、炭素原子4個以下のアルキル基が好ましく、例えば、メチル基CH3(以下、Meで表す。)、エチル基C2H5(以下、Etで表す)、プロピル基C3H7(以下、Prで表す。)、イソプロピル基i-C3H7(以下、i-Prで表す。)、ブチル基C4H9(以下、Buで表す)、イソブチル基i-C4H9(以下、i-Buで表す)等の低級アルキル基がより好ましい。
ここで、「ゾル-ゲル法」とは、有機金属化合物を加水分解すること等により、水酸化物のゾルを得て、脱水処理してゲルとし、さらにこのゲルを加熱処理することで、ある一定の形状(フィルム状、粒子状、繊維状等)の金属酸化物ガラスを調製する方法をいう。異なる複数のゾル溶液を混合する方法、他の金属イオンを添加する方法等により、多成分系の金属酸化物ガラスを得ることも可能である。
前記前駆体が、ポリシラザンを含有する場合は、下記式(I)で表されるポリシラザン及び有機溶剤中に必要に応じて触媒を含む溶液を塗布し、この溶剤を蒸発させて除去し、それによって樹脂基材上に0.05~3.0μmの層厚を有するポリシラザン層を残し、そして、水蒸気を含む雰囲気中で酸素、活性酸素、場合によっては、及び窒素の存在下に、上記のポリシラザン層を、局所的加熱することによって、当該樹脂基材上にガラス様の透明な被膜を形成する方法を採用することが好ましい。
式中、R1、R2、及びR3は、同一か又は異なり、互いに独立して、水素、あるいは場合によっては置換されたアルキル基、アリール基、ビニル基又は(トリアルコキシシリル)アルキル基、好ましくは水素、メチル、エチル、プロピル、iso-プロピル、ブチル、iso-ブチル、tert-ブチル、フェニル、ビニル又は3-(トリエトキシシリル)プロピル、3-(トリメトキシシリルプロピル)からなる群から選択される基を表し、この際、nは整数であり、そしてnは、当該ポリシラザンが150~150,000g/モルの数平均分子量を有するように定められる。
式中、R1、R2、R3、R4、R5及びR6は、互いに独立して、水素、あるいは場合によっては置換されたアルキル基、アリール基、ビニル基又は(トリアルコキシシリル)アルキル基を表し、この際、n及びpは整数であり、そしてnは、当該ポリシラザンが150~150,000g/モルの数平均分子量を有するように定められる。
上記式中、R1、R2、R3、R4、R5、R6、R7、R8及びR9は、互いに独立して、水素、あるいは場合によっては置換されたアルキル基、アリール基、ビニル基又は(トリアルコキシシリル)アルキル基を表し、この際、n、p及びqは整数であり、そしてnは、当該ポリシラザンが150~150,000g/モルの数平均分子量を有するように定められる。
本発明においては、フィルムミラーの最表層は、電気抵抗値が1.0×10-3~1.0×109Ω・□の帯電防止性を有し、鉛筆硬度がH以上6H未満、加重500g/cm2のスチールウール試験において傷が30本以下の特徴を有する帯電防止ハードコート層であるが、屋外暴露し、ブラシで洗浄した後の反射率が高いことから、鉛筆硬度は2H以上6H未満が好ましい。
前記無機複酸化物微粒子としては、ITO(インジウム錫酸化物)、ATO(アンチモン錫酸化物)、五酸化アンチモン・酸化亜鉛の複酸化物、燐ドープ酸価錫等が挙げられる。
JIS K 5600の規格に従って測定する。鉛筆を45度の角度にして、500gの荷重をかけて、各フィルムミラーのサンプルの表面の引っ掻き試験を行う。5回のうち4回以上傷の付かなかった鉛筆の硬さ記号で、ランク付けを行った。
スチールウール試験とは、サンプルの機能層面を#0000のスチールウールを用い、1cm2に切り出したスチールウールに500gの荷重をかけ、フィルム上を、ストローク100mm、速度30mm/secで所定回数往復摩擦した後の表面を目視で観察して評価する方法である。
JIS K 7194の規格に従って測定する。但し、試料は湿度50%、温度50℃の環境に2時間以上放置後、測定試料を一直線状に等間隔に配列した探針間隔5mmのプローブ(三菱化学ASPプローブ)にて5点測定する。その5点平均値を電気抵抗値とする。
JIS-R3257に基づいて、接触角計DM300(協和界面化学)を用いて測定した。水を3μL滴下してフィルムミラーの表面の接触角を測定した。
前記銀反射層の形成法としては、湿式法及び乾式法のどちらも使用することができる。
前記樹脂基材としては、従来公地の種々の樹脂フィルムを用いることができる。例えば、セルロースエステル系フィルム、ポリエステル系フィルム、ポリカーボネート系フィルム、ポリアリレート系フィルム、ポリスルホン(ポリエーテルスルホンも含む)系フィルム、ポリエチレンテレフタレート、ポリエチレンナフタレート等のポリエステルフィルム、ポリエチレンフィルム、ポリプロピレンフィルム、セロファン、セルロースジアセテートフィルム、セルローストリアセテートフィルム、セルロースアセテートプロピオネートフィルム、セルロースアセテートブチレートフィルム、ポリ塩化ビニリデンフィルム、ポリビニルアルコールフィルム、エチレンビニルアルコールフィルム、シンジオタクティックポリスチレン系フィルム、ポリカーボネートフィルム、ノルボルネン系樹脂フィルム、ポリメチルペンテンフィルム、ポリエーテルケトンフィルム、ポリエーテルケトンイミドフィルム、ポリアミドフィルム、フッ素樹脂フィルム、ナイロンフィルム、ポリメチルメタクリレートフィルム、アクリルフィルム等を挙げることができる。中でも、ポリカーボネート系フィルム、ポリエステル系フィルム、ノルボルネン系樹脂フィルム、及びセルロースエステル系フィルム、アクリルフィルムが好ましい。
前記接着層は、前記銀反射層または前記金属層と前記樹脂基材との接着性を高める機能があるものであれば特に限定はない。従って、該接着層は、樹脂基材と銀反射層または金属層とを密着する密着性、銀反射層または金属層を真空蒸着法等で形成する時の熱にも耐え得る耐熱性、及び銀反射層が本来有する高い反射性能を引き出すための平滑性が必要である。
前記腐食防止層は前記銀反射層に隣接して設けられることが好ましく、銀に対する腐食防止剤を含有する。該腐食防止剤としては、大別して、銀に対する吸着性基を有する腐食防止剤と酸化防止能を有する腐食防止剤(酸化防止剤とも言う)が好ましく用いられる。
銀に対する吸着性基を有する腐食防止剤としては、アミン類およびその誘導体、ピロール環を有する化合物、トリアゾール環を有する化合物、ピラゾール環を有する化合物、チアゾール環を有する化合物、イミダゾール環を有する化合物、インダゾール環を有する化合物、銅キレート化合物類、チオ尿素類、メルカプト基を有する化合物、ナフタレン系の少なくとも一種またはこれらの混合物から選ばれることが望ましい。
前記腐食防止層に含有される腐食防止剤としては、酸化防止剤を用いることもできる。
本発明において、銀の犠牲防食機能を有するものであるため、銀に隣接した形態で、銀よりもイオン化傾向が高い金属を使用する金属層を設けることができる。例えば、リチウム、セシウム、ルビジウム、カリウム、バリウム、ストロンチウム、カルシウム、ナトリウム、マグネシウム、アルミニウム、マンガン、タンタル、亜鉛、クロム、鉄、カドミウム、コバルト、ニッケル、スズ、鉛、アンチモン、ビスマス、銅、水銀等を挙げることができる。特にアルミニウム、亜鉛、鉄、スズ、銅であることが好ましい。
本発明においては、太陽光や紫外線による劣化防止の目的で、紫外線吸収剤を添加することができる。前記樹脂基材上に設けられた構成層のうちいずれか一層に、紫外線吸収剤を含有するか、前記腐食防止層の表面側に紫外線吸収剤層を設けることが好ましい。
本発明に係るフィルムミラー全体の厚さは、ミラーがたわみ防止、正反射率、取り扱い性等の観点から、75~250μmが好ましく、更に好ましくは90~230μm、更に好ましくは100~220μmである。
(フィルムミラー1の作製)
図1(a)において、樹脂基材21として、アクリル樹脂フィルム(三菱レイヨン製アクリプレンHBS006、厚さ75μm)を用いた。該アクリル樹脂フィルムの片面にポリエステル系樹脂(ポリエスター SP-181 日本合成化学製)とTDI(トリレンジイソシアネート)系イソシアネート(コスモネートTDI100、三井武田ケミカル社製)を樹脂固形分比率で10:2に混合し、溶媒としてメチルエチルケトンを加え、更に腐食防止剤としてグリコールジメルカプトアセテート(和光純薬製)0.05g/m2となるよう調整した量を混合し、グラビアコート法によりコーティングして、厚さ100nmの腐食防止層25を形成した。続いて、腐食防止層上に、真空蒸着により銀反射層22を150nmになるように蒸着した。次に銀反射層上に、腐食防止剤層と同じ組成で厚さ20nmの保護層24を形成した。
フィルムミラー1作製の際、帯電防止層の代わりに、67質量%のメタクリル系樹脂(住友化学社製、スミペックス)に3質量%のアモルファスシリカ(日産化学工業社製、スノーテックス)、1質量%の光開始剤(Irg184、BASFジャパン社製)を混合した溶液を、乾燥膜厚が3μmになるようにバーコーティングし、80℃でプレ乾燥させた後、紫外線硬化させることで、最表層23(ハードコート層)を形成し、フィルムミラー2を得た。
図1(a)において、樹脂基材21として、2軸延伸ポリエステルフィルム(ポリエチレンテレフタレートフィルム、厚さ100μm)(PET)を用いた。上記2軸延伸ポリエステルフィルムの片面にポリエステル系樹脂(ポリエスター SP-181 日本合成化学製)とTDI(トリレンジイソシアネート)系イソシアネート(コスモネートTDI100、三井武田ケミカル社製)を樹脂固形分比率で10:2に混合し、溶媒としてメチルエチルケトンを加え、更に腐食防止剤としてグリコールジメルカプトアセテート(和光純薬製)0.05g/m2となるよう調整した量を混合し、グラビアコート法によりコーティングして、厚さ100nmの腐食防止層25を形成した。続いて、真空蒸着により銀反射層22を150nmになるように蒸着した。次に銀反射層上に、前記腐食防止層25と同じ組成で厚さ20nmの保護層24を形成した。次に、ジペンタエリスリトールヘキサアクリレート(新中村化学工業株式会社製 商品名A-DPH 固形分100%)100質量部に対し、リンドープ酸化スズコロイド(日産化学工業株式会社製 商品名CX-S300M 粒子径20nm 固形分30%)を300質量部、MEK165質量部混合し攪拌した。開始剤としてIrgacure907(BASF社製)を5質量部加え、粘度20mPa・sの帯電防止ハードコート層塗布液を作製した。前記2軸延伸ポリエステルフィルムの腐食防止層25を形成した面の反対面に、硬化後の膜厚が5μmとなるように、前記帯電防止ハードコート層塗布液を塗布し、紫外線照射機を用い紫外線処理を行い、最表層23(帯電防止ハードコート層)を作製しフィルムミラー3を得た。
フィルムミラー3作製の際、樹脂基材21として、アクリル樹脂フィルム(三菱レイヨン株式会社製アクリプレンHBS010P、厚さ75μm)を用いて作製した以外は、フィルムミラー3と同様に作製し、フィルムミラー4を得た。
フィルムミラー4作製の際、図1(b)に示すように、樹脂基材と腐食防止剤層の間にガスバリア層26を形成した。作製方法としては、ジブチルエーテル中の3%パーヒドロポリシラザン液(クラリアント社製 NL120)を用いて、乾燥後の膜の厚さが100nmとなるように、樹脂基材上にバーコーティングし、3分間自然乾燥した後、70℃のオーブンで30分間アニールし、ガスバリア層26を形成した後に、フィルムミラー3の腐食防止剤層塗布、乾燥させた。その他はフィルムミラー3と同様にして、フィルムミラー5のサンプルを得た。
フィルムミラー5作製の際、リンドープ酸化スズコロイド300質量部の代わりに、五酸化アンチモン・酸化亜鉛の複酸化物コロイド(日産化学工業株式会社製 商品名CX-Z210IP-F2 粒子径50nm 固形分20%)450質量部を用いた以外はフィルムミラー5と同様にして、フィルムミラー6を得た。
フィルムミラー6作製の際、腐食防止剤のグリコールジメルカプトアセテート(銀吸着性腐食防止剤)に替えて、2,2′-メチレンビス(4,6-ジ-t-ブチルフェニル)オクチルホスファイト(酸化防止剤)(昭和化学工業株式会社製)を0.01g/m2加えた以外は、フィルムミラー6と同様の方法によりフィルムミラー7を作製した。
フィルムミラー6作製の際、図1(c)に示すように、樹脂基材とガスバリア層の間に、ポリエステル系樹脂(ポリエスター SP-181 日本合成化学製)とTDI(トリレンジイソシアネート)系イソシアネート(コスモネートTDI100、三井武田ケミカル社製)を樹脂固形分比率で10:2に混合した樹脂中にメチルエチルケトンを加え、紫外線吸収剤としてベンゾトリアゾール(BASF社製)を0.01g/m2となるように含有させ、グラビアコート法により形成した厚さ100nmの紫外線吸収剤層27を設けた以外はフィルムミラー6と同様にして、フィルムミラー8を作製した。
フィルムミラー8作製の際、樹脂基材21として、アクリル樹脂フィルム(三菱レイヨン製アクリプレンHBS010P、厚さ75μm)を、アクリル樹脂フィルム(三菱レイヨン株式会社製アクリプレンHBS010P、厚さ125μm)に替えた以外は、フィルムミラー8と同様の方法により、フィルムミラー9を作製した。
前記フィルムミラー3の作製において、帯電防止ハードコート層塗布液のリンドープ酸化スズコロイド(日産化学工業株式会社製 商品名CX-S300M 粒子径20nm 固形分30%)300質量部を、導電性高分子(ORMECON(登録商標)、日産化学工業製、高導電性ポリアニリン系有機溶媒分散液)100質量部に替えたほかは同様にしてフィルムミラー10を作製した。
前記フィルムミラー3において、図2(a)に示すように、最表層23(帯電防止ハードコート層)を、2軸延伸ポリエステルフィルムの腐食防止層25を形成した面の反対面に設ける代わりに、保護層24上に設けた他は同様にして、フィルムミラー11を作製した。
前記フィルムミラー11において、図2(b)に示すように、保護層24と最表層23との間に、フィルムミラー5で用いたガスバリア層26を形成した以外は、フィルムミラー11と同様にして、フィルムミラー12を作製した。
フィルムミラー12作製の際、リンドープ酸化スズコロイド300質量部の代わりに、五酸化アンチモン・酸化亜鉛の複酸化物コロイド(日産化学工業株式会社製 商品名CX-Z210IP-F2 粒子径50nm 固形分20%)450質量部を用いた以外はフィルムミラー12と同様にして、フィルムミラー13を得た。
フィルムミラー13作製の際、腐食防止剤のグリコールジメルカプトアセテート(和光純薬製)0.05g/m2に替えて、2,2′-メチレンビス(4,6-ジ-t-ブチルフェニル)オクチルホスファイト(酸化防止剤)(昭和化学工業株式会社製)を0.01g/m2加えた以外は、フィルムミラー13と同様の方法によりフィルムミラー14を作製した。
フィルムミラー14作製の際、図2(c)に示すように、樹脂基材とガスバリア層の間に、ポリエステル系樹脂(ポリエスター SP-181 日本合成化学製)とTDI(トリレンジイソシアネート)系イソシアネート(コスモネートTDI100、三井武田ケミカル社製)を樹脂固形分比率で10:2に混合した樹脂中にメチルエチルケトンを加え、紫外線吸収剤としてベンゾトリアゾール(BASF社製)を0.01g/m2となるように含有させ、グラビアコート法により形成した厚さ100nmの紫外線吸収剤層27を設けた以外はフィルムミラー14と同様にして、フィルムミラー15を作製した。
上記で得たフィルムミラー1~15について、下記の方法により正反射率及び耐候性、紫外線耐性の測定をそれぞれ行った。
島津製作所社製の分光光度計「U-4100」に、反射面の法線に対して、入射光の入射角を5°となるように調整し、反射角5°の正反射率を測定した。評価は、250nmから2500nmまでの平均反射率として測定した。入射は、最表層側から行った。
アイ スーパーUVテスター SUV-W151(結露形)(岩崎電気製)を用い、照射強度100mW/cm2、温度60℃、湿度85%RHの条件で1ヶ月間放置後のフィルムミラーの正反射率を、上記光線反射率測定と同様の方法により測定し、強制劣化前のフィルムミラーの正反射率と強制劣化後のフィルムミラーの正反射率から、強制劣化試験前後における正反射率の低下率を算出した。以下に耐候性試験の評価基準を記す。
5:正反射率の低下率が5%未満
4:正反射率の低下率が5%以上10%未満
3:正反射率の低下率が10%以上15%未満
2:正反射率の低下率が15%以上20%未満
1:正反射率の低下率が20%以上
<鉛筆硬度試験>
JIS K 5600の規格に従って実施した。鉛筆を45度の角度として、500gの荷重をかけて、各フィルムミラーの最表層面の引っ掻き試験を行った。5回のうち4回以上傷の付かなかった鉛筆の硬さ記号で、ランク付けを行った。
得られたフィルムミラー1~15の最表層面を#0000のスチールウールを用い、1cm2に切り出したスチールウールに500gの荷重をかけ、フィルム上を、ストローク100mm、速度30mm/secで所定回数往復摩擦した後の表面を目視で観察し、以下のA~Eで評価した。
A:傷0本
B:傷1~10本
C:傷11~30本
D:傷31~50本
E:50本以上
<電気抵抗値>
JIS K 7194の規格に従って各フィルムミラーの最表層面を測定した。但し、試料を湿度50%、温度50℃の環境に24時間以上放置後、ハイレスタUP MCP-HT450型を用い、測定試料を一直線状に等間隔に配列した探針間隔5mmのプローブ(三菱化学ASPプローブ)にて5点測定する。その5点平均値を電気抵抗値とする。
フィルムミラー1~10の保護層の上、またフィルムミラー11~15の2軸延伸ポリエステルフィルムの腐食防止層を形成した面の反対面に、粘着層を塗布し、粘着層とアルミ基材を対面して貼り付けて太陽熱発電用反射装置を作製し、10m四方の砂場に地面との角度が45度となるように設置し、180日間放置し、上記条件で反射率を測定した。また、所定のブラシと水でフィルム最表面を洗浄した後の同様に測定した。尚、粘着層塗布液はアクリル粘着剤(リンテック株式会社、TL-75K)であり、塗布膜厚は50μmである。
以下、他の好ましい態様について、図3、4を参照し、参考例および参考例の比較例を用いて具体的に説明する。なお、以下の「比較例」は参考例の比較例を意味する。
図3(a)は比較例1の構成を示す。
図3(b)は比較例2の構成を示す。
樹脂基材として、2軸延伸ポリエステルフィルム(ポリエチレンテレフタレートフィルム、厚さ100μm)を用いた。上記2軸延伸ポリエステルフィルムの片面に、酸化ランタンと酸化アルミニウムを8:2で混合した混合物を真空蒸着法により60nmになるように蒸着し、続いて銅の真空蒸着により厚さ100nmの金属層を形成し、同様に銀反射層を150nmになるように蒸着した。銀反射層上に、ポリエステル系樹脂とTDI系イソシアネートを樹脂固形分比率で10:2に混合し、溶媒としてメチルエチルケトンを加え、更に腐食防止剤としてグリコールジメルカプトアセテート(和光純薬製)を0.05g/m2となるよう調整した量を添加し、グラビアコート法によりコーティングして、厚さ100nmの腐食防止層5を形成した。腐食防止層上に、オプスターZ7537(JSR)を厚さ5μmで塗布し、紫外線照射により硬化して防汚性兼耐傷性を有する最表層7を形成し、参考例1のサンプルを得た。
参考例1のサンプルの基材として、アクリル樹脂フィルム(アクリプレンHBS006、100μm)を用いた以外は、参考例1の層構成で作成し、参考例2のサンプルを得た。
参考例1において、最表層にガスバリア性を付与した。作成方法としては、実施例1の最表層に替えて、ジブチルエーテル中の3%パーヒドロポリシラザン液(クラリアント社製 NL120)を用いて、乾燥後の膜の厚さが100nmとなるように、腐食防止層5上にバーコーティングし、3分間自然乾燥した後、70℃のオーブンで30分間アニールし、ガスバリア性を有する最表層7を得た。その他は参考例1と同様にして、参考例3のサンプルを得た。
参考例3において、ガスバリア性を有する最表層上に、AZエレクトロニクス社製の「親水化促進剤」(製品名)を塗布することにより、ガスバリア性を有する最表層7の親水性を向上した他は同様にして参考例4のサンプルを得た。
参考例4において、腐食防止層5のグリコールジメルカプトアセテート(銀吸着性腐食防止剤)に替えて、2,2′-メチレンビス(4,6-ジ-t-ブチルフェニル)オクチルホスファイト(酸化防止剤)を0.01g/m2加えた以外は、参考例4と同様の方法により参考例5のサンプルを作製した。
参考例4において、腐食防止層5の上に、ポリエステル系樹脂とTDI(トリレンジイソシアネート)系イソシアネートを樹脂固形分比率で10:2に混合した樹脂中にメチルエチルケトンを加え、紫外線吸収剤としてベンゾトリアゾールを0.01g/m2となるように含有させ、グラビアコート法により形成した厚さ100nmの紫外線吸収剤層10をもうけ、その上に最表層7を設けた他は同様に、参考例6のサンプルを作製した。
参考例6において、樹脂基材1として、2軸延伸ポリエステルフィルム(ポリエチレンテレフタレートフィルム、厚さ100μm)を、2軸延伸ポリエステルフィルム(ポリエチレンテレフタレートフィルム、厚さ175μm)に替えた以外は、参考例6と同様の方法により、参考例7のサンプルを作製した。
上記で得たフィルムミラーについて、下記の方法により正反射率及び耐候性、紫外線耐性の測定をそれぞれ行った。
島津製作所社製の分光光度計「UV265」に、積分球反射付属装置を取り付けたものを改造し、反射面の法線に対して、入射光の入射角を5°となるように調整し、反射角5°の正反射率を測定した。評価は、250nmから2500nmまでの平均反射率として測定した。
キセノンランプ照射下、温度85℃、湿度85%RHの条件で30日間放置後のフィルムミラーの正反射率を、上記光線反射率測定と同様の方法により測定し、強制劣化前のフィルムミラーの正反射率と強制劣化後のフィルムミラーの正反射率から、強制劣化試験前後における正反射率の低下率を算出した。以下に耐候性試験の評価基準を記す。
4:正反射率の低下率が5%以上10%未満
3:正反射率の低下率が10%以上15%未満
2:正反射率の低下率が15%以上20%未満
1:正反射率の低下率が20%以上。
JIS K 5600の規格に従って実施した。鉛筆を45度の角度として、500gの荷重をかけて、各フィルムミラーのサンプルの表面の引っ掻き試験を行った。5回のうち4回以上傷の付かなかった鉛筆の硬さ記号で、ランク付けを行った。
JIS-R3257に基づいて、水3μL滴下してフィルムミラーの表面の接触角を、接触角計DM300(協和界面化学)を用いて測定した。
実施例にて作成したサンプルをアルミ基材に貼り付けて太陽熱発電用反射装置を作製し、砂漠に地面との角度が45度となるように設置し、1ヶ月放置し、上記条件で反射率を測定した。また、所定のブラシと水でフィルム最表面を洗浄した後の同様に測定した。
2 接着層
3 金属層
4 銀反射層
5 腐食防止層
6 ガスバリア層
7 最表層(防汚性兼耐傷性)
8 最表層(防汚性)
9 最表層(耐傷性)
10 紫外線吸収剤層
21 樹脂基材
22 銀反射層
23 最表層
24 保護層
25 腐食防止層
26 ガスバリア層
27 紫外線吸収層
Claims (9)
- 樹脂基材と、前記樹脂基材の少なくとも一方の面に銀反射層が設けられたフィルムミラーであって、前記フィルムミラーは、光入射側に最表層を有し、該最表層の表面の電気抵抗値は、1.0×10-3~1.0×109Ω・□であり、かつ、鉛筆硬度がH以上6H未満、加重500g/cm2のスチールウール試験における傷が30本以下であることを特徴とするフィルムミラー。
- 前記最表層が無機複酸化物微粒子を含有することを特徴とする請求項1に記載のフィルムミラー。
- 前記最表層がアクリレートまたはウレタン系樹脂を含有することを特徴とする請求項1または2に記載のフィルムミラー。
- 前記銀反射層の両面に銀の腐食防止層を有することを特徴とする請求項1~3のいずれか1項に記載のフィルムミラー。
- 前記腐食防止層と前記樹脂基材との間に、ガスバリア層を有することを特徴とする請求項4に記載のフィルムミラー。
- 前記銀反射層と、前記樹脂基材の間、又は前記銀反射層以外のいずれか一層に紫外線吸収剤を含有することを特徴とする請求項1~5のいずれか一項に記載のフィルムミラー。
- フィルムミラー全体の厚さが、75~250μmの範囲内であることを特徴とする請求項1~6のいずれか一項に記載のフィルムミラー。
- 請求項1~7のいずれか一項に記載のフィルムミラーが、太陽熱発電用フィルムミラーであることを特徴とする太陽熱発電用フィルムミラー。
- 請求項8に記載の太陽熱発電用フィルムミラーの光入射側の反対側の表面に粘着層を塗設した後、該粘着層を介して、金属基材上に該太陽熱発電用フィルムミラーを貼り付けて形成されたことを特徴とする太陽光発電用反射装置。
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JP2015007672A (ja) * | 2013-06-24 | 2015-01-15 | 富士フイルム株式会社 | フィルムミラー及びフィルムミラーの製造方法 |
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WO2018100963A1 (ja) * | 2016-11-30 | 2018-06-07 | 富士フイルム株式会社 | ガスバリアフィルムおよびガスバリアフィルムの製造方法 |
JPWO2018100963A1 (ja) * | 2016-11-30 | 2019-10-17 | 富士フイルム株式会社 | ガスバリアフィルムおよびガスバリアフィルムの製造方法 |
US10988631B2 (en) | 2016-11-30 | 2021-04-27 | Fujifilm Corporation | Gas barrier film and method of producing a gas barrier film |
Also Published As
Publication number | Publication date |
---|---|
EP2533076A4 (en) | 2013-11-06 |
US9110228B2 (en) | 2015-08-18 |
EP2533076A1 (en) | 2012-12-12 |
JP5747823B2 (ja) | 2015-07-15 |
US20120287521A1 (en) | 2012-11-15 |
JPWO2011096320A1 (ja) | 2013-06-10 |
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