WO2013191285A1 - 赤外線反射機能付き透光性基板 - Google Patents
赤外線反射機能付き透光性基板 Download PDFInfo
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- WO2013191285A1 WO2013191285A1 PCT/JP2013/067130 JP2013067130W WO2013191285A1 WO 2013191285 A1 WO2013191285 A1 WO 2013191285A1 JP 2013067130 W JP2013067130 W JP 2013067130W WO 2013191285 A1 WO2013191285 A1 WO 2013191285A1
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- infrared
- substrate
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- translucent substrate
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Definitions
- the present invention relates to a light-transmitting substrate with an infrared reflection function having high reflectivity in the infrared light region.
- an infrared reflecting film having a function of reflecting infrared rays is widely known.
- Such an infrared reflecting film is mainly used for suppressing the thermal effect of the emitted sunlight (sunlight).
- this type of infrared reflective film is attached to a light-transmitting substrate such as glass or a transparent resin plate installed in an automobile, a railroad, a house, etc., so that infrared rays incident on the room through the light-transmitting substrate ( In particular, near infrared rays) are shielded. Thereby, the temperature rise in the room is suppressed.
- the infrared reflective film described in Patent Document 1 has an aluminum vapor-deposited layer having a visible light transmittance of 15 to 75% on one surface of a polyester film and a hard coat layer made of a resin that is cured by ultraviolet rays or electron beams. It is the laminated film which laminated
- the infrared reflective film described in Patent Document 2 is cured with a metal thin film layer having a visible light transmittance of at least 70% on one surface of a thermoplastic resin film such as a biaxially stretched polyethylene terephthalate (PET) film and heat or ultraviolet rays.
- a thermoplastic resin film such as a biaxially stretched polyethylene terephthalate (PET) film and heat or ultraviolet rays.
- PET biaxially stretched polyethylene terephthalate
- Is a laminated film in which a hard coat layer made of resin is sequentially laminated and an acrylic pressure-sensitive adhesive is provided on the other surface, and the laminated film is affixed to a window glass so that it is included in sunlight by the metal thin film layer. Infrared rays are reflected.
- the solar radiation includes electromagnetic waves having a plurality of wavelengths from the ultraviolet region to the infrared region, but the solar radiation includes only electromagnetic waves up to the near infrared region having a wavelength of about 2500 ⁇ m in the infrared region, and the wavelength is 2500 ⁇ m. It is known that electromagnetic waves in the far-infrared region exceeding are hardly included. Therefore, green glass or smoke glass that absorbs and / or reflects solar radiation is used for the window glass, or a thermal barrier film is laminated on the indoor side of the glass to suppress the incidence of solar radiation into the room. It was thought that a sufficient reduction in cooling load could be obtained. However, there is a problem that it is difficult to sufficiently reduce the indoor cooling load only by using the glass or the heat shielding film.
- the glass has a high solar absorptivity, so it absorbs near-infrared electromagnetic waves contained in solar radiation and suppresses the incidence of solar radiation (near infrared) into the room, while the glass itself is It is conceivable that the temperature rises due to near infrared rays.
- the amount of solar radiation can be suppressed by laminating a thermal barrier film on the indoor side of the glass, but since the emissivity of the indoor surface is high, the re-radiation of far infrared rays from the glass to the indoor side is suppressed. It is considered that the room temperature rises due to the effect of re-radiant heat.
- the present invention has been made in view of such circumstances, it is possible to suppress the re-radiation heat entering the indoor side by re-radiation from the translucent substrate layer having a high solar absorptance, and to suppress an increase in the indoor temperature, Another object of the present invention is to provide a light-transmitting substrate with an infrared reflecting function that can have good durability (scratch resistance).
- the translucent substrate with an infrared reflecting function includes a translucent substrate layer disposed so as to separate the room from the outside, and an infrared reflecting function laminated on the surface of the translucent substrate layer on the indoor side.
- the solar radiation absorptivity of the translucent substrate layer is 30% or more
- the infrared reflection functional layer includes a reflection layer for reflecting infrared rays, and a protective layer laminated on the indoor surface of the reflection layer.
- the vertical emissivity of the surface on the protective layer side is 0.50 or less.
- the solar radiation transmittance is reduced by the infrared reflection functional layer. Therefore, it is possible to suppress sunlight (near infrared rays) that is directly incident on the room from the outside through the light-transmitting substrate layer. Further, when sunlight (near infrared rays) incident from the outside toward the room reaches the light transmissive substrate layer disposed so as to separate the room from the room, the light is transmitted through and reflected by the light transmissive substrate layer. Alternatively, the light-transmitting substrate layer is absorbed.
- the temperature of the translucent substrate layer increases accordingly.
- the temperature of the reflective layer and the protective layer also rises due to conduction heat from the translucent substrate layer, and the temperature of the reflective layer and the protective layer becomes substantially the same temperature as the translucent substrate layer. Become. If it does so, far infrared rays will be re-radiated toward the room
- the infrared reflective functional layer includes a protective layer, the reflective layer having low scratch resistance is not exposed and can have good durability (scratch resistance).
- the spectral reflectance ⁇ n is measured in the wavelength range of 5 to 50 ⁇ m of room temperature thermal radiation.
- the wavelength region of 5 to 50 ⁇ m is the far infrared region, and the vertical emissivity decreases as the reflectance in the far infrared wavelength region increases.
- Another translucent substrate with an infrared reflecting function is disposed so as to separate the room from the outside, and the translucent substrate layer having a visible light transmittance of 50% or more, and the translucency
- An infrared reflection functional layer that is laminated on the indoor surface of the substrate layer and has a visible light transmittance of 50% or less, and the solar radiation absorption rate of the translucent substrate layer is 30% or more, and the infrared reflection function
- the layer includes a reflective layer for reflecting infrared rays and a protective layer laminated on a surface on the indoor side of the reflective layer, and a vertical emissivity of the infrared reflective functional layer on the protective layer side surface is 0.50. It is as follows.
- a translucent substrate layer having a visible light transmittance of 50% or more is used for the translucent substrate with an infrared reflection function having the above-described configuration. Therefore, although the visible light transmittance is lower than the translucent substrate layer of the translucent substrate with an infrared reflecting function of less than 50%, the translucent substrate layer itself has a lower solar absorptance, but the translucent substrate layer itself. The solar transmittance of is increased. So, according to the translucent board
- an infrared reflective functional layer on the translucent substrate layer, the solar absorptance increases, but reradiant heat from far infrared rays reradiated from the translucent substrate layer to the indoor side is suppressed. Therefore, the temperature rise in the room can be suppressed.
- an infrared reflective functional layer with a low visible light transmittance is laminated on a light transmissive substrate layer with a high visible light transmittance, it is difficult to see the room from the outside through the light transmissive substrate layer, for example, providing privacy protection can do.
- the infrared reflecting functional layer is preferably an infrared reflecting film attached to a surface on the indoor side of the translucent substrate layer. According to such a configuration, since the translucent substrate layer and the infrared reflective functional layer can be formed separately, the infrared reflective functional layer is installed in a general automobile, railway, house, etc. It can be applied to a conductive substrate and has high versatility.
- the translucent substrate layer is preferably a glass or a resin substrate.
- the protective layer includes a hard coat layer laminated on the reflective layer. According to such a configuration, the hard coat layer imparts scratch resistance to the protective layer.
- the light transmissive substrate with an infrared reflecting function according to the present invention, re-radiation heat entering the indoor side by re-radiation from the light transmissive substrate layer having a high solar absorptivity is suppressed, and the indoor temperature is increased. It is possible to achieve an excellent effect of being able to be suppressed and having good durability (abrasion resistance).
- substrate with an infrared reflective function which concerns on this embodiment is formed for the purpose of heat insulation and heat insulation.
- the translucent substrate with an infrared reflecting function is laminated on a translucent substrate layer 10 disposed so as to separate the room from the outdoor, and on the indoor surface of the translucent substrate layer 10.
- the thickness of the translucent substrate layer 10 is shown smaller than the actual thickness with respect to the thickness of the infrared reflective functional layer 20.
- the solar absorptivity of the translucent substrate layer 10 according to the present embodiment is 30% or more.
- green glass, smoked glass, or the like having high solar absorptance is employed.
- green glass, smoked glass or the like is employed as the translucent substrate layer 10, but is not limited thereto, and may be a resin substrate such as resin glass, for example.
- the solar radiation absorption rate may be 30% or more, but may be 40% or more, or 50% or more, for example.
- the infrared reflective functional layer 20 is an infrared reflective film that is laminated (attached) to the indoor surface of the translucent substrate layer 10.
- the infrared reflection functional layer 20 includes a reflection layer 22 for reflecting infrared rays, and a protective layer 23 laminated on the indoor side surface of the reflection layer 22. More specifically, the infrared reflective functional layer 20 has a layer structure in which a reflective layer 22 and a protective layer 23 are laminated in that order on one surface 21a of a base material 21, and an adhesive layer 24 is provided on the other surface 21b. It has become.
- the vertical emissivity of the surface of the infrared reflecting functional layer 20 on the protective layer 23 side is set to 0.50 or less based on the experimental results described later.
- the vertical emissivity of the surface of the infrared reflection functional layer 20 on the protective layer 23 side is preferably 0.40 or less, more preferably 0.30 or less.
- a polyester film is used as the substrate 21 .
- a film made of polyethylene terephthalate, polyethylene naphthalate, polypropylene terephthalate, polybutylene terephthalate, polycyclohexylene methylene terephthalate, or a mixed resin in which two or more of these are combined is used.
- a polyethylene terephthalate (PET) film is preferable from the viewpoint of performance, and a biaxially stretched polyethylene terephthalate (PET) film is particularly preferable.
- the reflection layer 22 is a vapor deposition layer formed on the surface (one surface) 21a of the base material 21 by vapor deposition.
- the method for forming the vapor deposition layer include physical vapor deposition (PVD) such as sputtering, vacuum vapor deposition, and ion plating.
- PVD physical vapor deposition
- the reflective layer 22 is formed on the base material 21 by heating and evaporating the vapor deposition material by a method such as resistance heating, electron beam heating, laser beam heating, arc discharge or the like in vacuum.
- Ion plating is a vapor deposition method that combines vacuum vapor deposition and sputtering. In this method, in a vacuum, the evaporation layer released by heating is ionized and accelerated in an electric field, and is deposited on the substrate 21 in a high energy state, whereby the reflective layer 22 is formed.
- the reflective layer 22 has a multilayer structure in which a semi-transparent metal layer 22a is sandwiched between a pair of transparent layers 22b and 22c.
- the reflective layer 22 is formed by depositing the transparent layer 22b on the surface (one surface) 21a of the substrate 21, and then forming the translucent metal layer 22a on the transparent layer 22b. Finally, a transparent layer 22c is deposited on the semitransparent metal layer 22a.
- Examples of the material for forming the translucent metal layer 22a include aluminum (Al), silver (Ag), silver alloys (MgAg, APC (AgPdCu), AgCu, AgAuCu, AgPd, AgAu, etc.), aluminum alloys (AlLi, AlCa, AlMg or the like) or a metal material in which two or more of these are combined is used.
- the translucent metal layer 22a may be formed in two or more layers using these metal materials.
- the transparent layers 22b and 22c are for imparting transparency to the reflective layer 22 and preventing the translucent metal layer 22a from deteriorating.
- ITO indium tin oxide
- ITO indium titanium oxide
- oxidized Oxides such as indium zinc (IZO), gallium zinc oxide (GZO), aluminum zinc oxide (AZO), and gallium indium oxide (IGO) are used.
- the protective layer 23 includes a resin layer 23a laminated on the reflective layer 22 and a hard coat layer 23b formed on the resin layer 23a, and is adhered to the reflective layer 22 using an adhesive. That is, the protective layer 23 has a multilayer structure including an adhesive layer 23c, a resin layer 23a, and a hard coat layer 23b in order from the reflective layer 22 side, and the hard coat layer 23b is an infrared reflective functional layer according to this embodiment. 20 surfaces (outermost layers).
- the resin layer 23a for example, an olefin film is used, and as the olefin film, for example, high density polyethylene obtained by singly or copolymerizing ethylene, low density polyethylene, linear low density polyethylene, propylene alone or A film made of copolymerized polypropylene, polymethylpentene, or a mixed resin in which two or more of these are combined is used.
- the resin layer 23a is preferably a polypropylene (PP) film, and particularly preferably a biaxially oriented polypropylene (OPP) film.
- the thickness of the resin layer 23a is preferably 5 to 30 ⁇ m.
- the resin layer 23a may be a layer having a cross-linked structure of polymers including the repeating unit A represented by the following chemical formula I.
- the resin layer 23a is preferably a layer containing a polymer containing at least any two or more of repeating units A, B and C represented by the following chemical formula II.
- R1 in Chemical Formula II H or a methyl group can be used.
- R2 to R5 in Chemical Formula II H and an alkyl group or alkenyl group having 1 to 4 carbon atoms can be used.
- hydrogenated nitrile rubber (HNBR) is composed of repeating units A, B and C, and H is used as R1 to R5.
- the repeating number k is preferably 10 to 1000.
- acrylonitrile (repeating unit D) and derivatives thereof as shown in Chemical Formula III
- alkyl having 4 carbon atoms (repeating unit E) and derivatives thereof
- butadiene And a copolymer of the repeating unit F1 or F2) and derivatives thereof.
- R6 represents H or a methyl group
- R7 to R18 represent H or an alkyl group having 1 to 4 carbon atoms.
- F1 and F2 represents a repeating unit in which butadiene is polymerized, and F1 is a main repeating unit.
- nitrile rubber or nitrile rubber which is a copolymer of acrylonitrile (repeating unit D) and its derivatives of formula III, 1,3-butadiene (repeating unit F1) and its derivatives.
- Hydrogenated nitrile rubber in which part or all of the double bond is hydrogenated may be used.
- the butadiene on the left side is bonded to the side to which the cyano group (—CN) of acrylonitrile is bonded, and the butadiene on the right side is formed to the side to which the cyano group (—CN) of acrylonitrile is not bonded.
- one repeating unit A, one repeating unit B, and two repeating units C are included.
- the repeating unit A includes a carbon atom in which the carbon atom on the right side of the butadiene on the left side is bonded to the cyano group (—CN) of acrylonitrile, and the repeating unit B is bonded to the cyano group (—CN) of acrylonitrile.
- the resin layer 23a is prepared by dissolving the above-described polymer in a solvent (with a crosslinking agent if necessary), preparing a solution, applying the solution on the reflective layer 22, and then drying the solution (solvent Is volatilized).
- a configuration in which the protective layer 23 does not have an adhesive layer may be employed.
- the solvent is a solvent in which the above-described polymer is soluble.
- a solvent such as methyl ethyl ketone (MEK) or methylene chloride (dichloromethane) is used.
- Methyl ethyl ketone and methylene chloride are low boiling point solvents (methyl ethyl ketone is 79.5 ° C., methylene chloride is 40 ° C.). Therefore, when these solvents are used, since the solvent can be volatilized at a low drying temperature, the base material 21 (or the reflective layer 22) is not damaged by heat.
- the thickness of the resin layer 23a is 1 ⁇ m or more as a lower limit. Preferably, it is 3 ⁇ m or more. Moreover, as an upper limit, it is 20 micrometers or less. Preferably, it is 15 ⁇ m or less. More preferably, it is 10 ⁇ m or less. If the thickness of the resin layer 23a is small, the infrared reflection characteristics are enhanced, but the scratch resistance is impaired, and the function as the protective layer 23a cannot be sufficiently exhibited. When the thickness of the resin layer 23a is large, the heat insulating property of the infrared reflective film is deteriorated. If the thickness of the resin layer 23a is within the above range, the resin layer 23a that can absorb the infrared rays and can appropriately protect the reflective layer 22 is obtained.
- L: m 5 to 25:60 to 90: 0 to 20 is more preferable
- k: l: m 15 to 25:65 to 85: 0 to 10 is more preferable.
- the resin layer 23a preferably has a cross-linked structure between polymers. Since the solvent resistance of the resin layer 23a is improved by cross-linking the polymers, the resin layer 23a is prevented from being eluted even when a solvent soluble in the polymer contacts the resin layer 23a. can do.
- the cumulative irradiation dose of the electron beam is 50 kGy or more as a lower limit value. Preferably, it is 100 kGy or more. More preferably, it is 200 kGy or more. Moreover, as an upper limit, it is 1000 kGy or less. Preferably, it is 600 kGy or less. More preferably, it is 400 kGy or less.
- the cumulative irradiation dose refers to the irradiation dose when the electron beam is irradiated once, and the total irradiation dose when the electron beam is irradiated a plurality of times.
- the single irradiation dose of the electron beam is preferably 300 kGy or less. If the integrated irradiation dose of the electron beam is within the above range, sufficient crosslinking between the polymers can be obtained. Moreover, if the integrated irradiation dose of the electron beam is within the above range, yellowing of the polymer and the substrate 1 generated by the electron beam irradiation can be minimized, and an infrared reflective film with less coloring can be obtained. Can do.
- These electron beam irradiation conditions are irradiation conditions at an acceleration voltage of 150 kV.
- a crosslinking agent such as a polyfunctional monomer such as a radical polymerization type monomer when the polymer is dissolved in the solvent or after the polymer is dissolved in the solvent.
- a polyfunctional monomer such as a radical polymerization type monomer
- radical polymerization monomers of (meth) acrylate monomers are preferred.
- the accumulated irradiation dose of the electron beam can be completed with a low irradiation dose. Moreover, since the cumulative irradiation dose of the electron beam is reduced, yellowing of the polymer and the substrate 21 can be further suppressed, and productivity can be improved.
- the amount of the additive added increases, the vertical emissivity of the surface of the infrared reflecting film on the resin layer 23a side (based on the reflective layer 22) deteriorates.
- the amount of the additive added is preferably 1 to 35% by weight with respect to the polymer. More preferably, it is 2 to 25% by weight based on the polymer.
- the hard coat layer 23b has transparency similar to the base material 21 and the resin layer 23a, and also has scratch resistance to prevent the surface from being scratched and scratched during cleaning and the like to reduce transparency.
- the hard coat layer 23b is not particularly limited as long as it exhibits sufficient scratch resistance (hardness) such as an ionizing radiation curable resin, a thermosetting resin, and a thermoplastic resin.
- the hard coat layer 23b is preferably an ionizing radiation curable resin such as an ultraviolet curable resin that is easy to form and easily increases the pencil hardness to a desired value.
- an ultraviolet curable acrylic-urethane hard coat is used as the ionizing radiation curable resin.
- the hard coat layer 23b is formed using an ionizing radiation curable resin
- the ionizing radiation curable resin is diluted as it is or with an organic solvent to an appropriate concentration, and the resulting solution is coated on the resin layer 23a with a coater.
- the hard coat layer 23b is formed by irradiating with ionizing radiation irradiation lamps for several seconds to several minutes.
- an organic solvent solution of the thermosetting resin is applied onto the resin layer 23a with a coating machine (coater), a release sheet is provided thereon, and a laminator or the like is provided. After deaeration, perform thermosetting and thermocompression bonding.
- the release sheet is not used, the hard coat layer 23b is formed by putting a drying step and evaporating the solvent before drying and heating so that the surface does not stick.
- the thickness of the hard coat layer 23b is preferably 0.5 to 10 ⁇ m.
- the adhesive layer 23c is formed using a polyester-based adhesive. And after forming the hard coat layer 23b on the olefin film used as the resin layer 23a, the polyester adhesive is apply
- the thickness of the adhesive layer 23c is preferably 0.1 to 1.5 ⁇ m.
- the translucent substrate with an infrared reflection function employs a two-layer structure of the resin layer 23 a and the hard coat layer 23 b as the protective layer 23.
- the hard coat layer 23b does not have better adhesion to the reflective layer 22 than the resin layer 23a (more precisely, the adhesive layer 23c). Accordingly, when the hard coat layer 23b is directly laminated on the reflective layer 22 without the resin layer 23a, water or the like enters from the interface between the reflective layer 22 and the hard coat layer 23b, and the reflective layer 22 deteriorates. It is assumed that the scratch resistance is impaired. However, since the hard coat layer 23b is formed through the resin layer 23a in the translucent substrate with an infrared reflection function according to the present embodiment, there is no such concern.
- the solar light transmittance is reduced by the infrared reflecting function layer 20, so that the light passes through the light-transmitting substrate layer 10 from the outside to the room.
- Directly incident sunlight can be suppressed.
- the translucent substrate layer 10 is transmitted, reflected, or absorbed by the translucent substrate layer 10. Will come to be.
- the infrared reflective functional layer 20 includes the protective layer 23, the reflective layer 22 having low scratch resistance is not exposed and can have good durability (scratch resistance).
- the inventors produced a light-transmitting substrate with an infrared reflecting function according to the above embodiment (Examples 1 to 4), and also produced a light-transmitting substrate with an infrared reflecting function for comparison.
- Examples 1 to 3 The production methods in Examples 1 to 3 are as follows. First, the reflective layer 22 is laminated on one surface 21a of the base material 21 by the DC magnetron sputtering method. Specifically, first, a transparent layer 22b is laminated on one surface 21a of the substrate 21 by a DC magnetron sputtering method, then a semi-transparent metal layer 22a is laminated by a DC magnetron sputtering method, and then DC magnetron sputtering.
- the transparent layer 22c is laminated by the method. Further, a hard coat agent is applied to the surface of the resin layer 23a (“acryl-urethane hard coat PC1097” manufactured by DIC) and cured by irradiating with ultraviolet rays to form the hard coat layer 23b. Then, a polyester-based adhesive is applied to the opposite surface of the resin layer 23a, and the laminate of the resin layer 23a / hard coat layer 23b is bonded to the surface of the reflective layer 22 via the adhesive layer 23c. Thus, the infrared reflective functional layer 20 was produced. The produced infrared reflective functional layer 20 was laminated on the translucent substrate layer (green glass) 10 via an adhesive layer to produce a translucent substrate with an infrared reflective function. Conditions such as the composition / component and thickness of each layer are shown in Table 1 below.
- Comparative Example 1 the manufacturing method in Comparative Example 1 is as follows. A PET layer was provided on the hard coat layer 23b of the infrared reflective functional layer 20 produced by the above production method via an adhesive layer. And the produced infrared reflective function layer 20 is laminated
- Example 1 A polyethylene terephthalate (PET) film having a thickness of 50 ⁇ m was used as the base material 21. Further, a transparent layer 22b made of indium tin oxide (ITO) is formed on the substrate 21 with a thickness of 35 nm, and a translucent metal layer 22a made of APC (AgPdCu) is formed thereon with a thickness of 11.5 nm. A transparent layer 22c made of indium tin oxide (ITO) was formed thereon with a thickness of 35 nm, and this was used as the reflective layer 22.
- PET polyethylene terephthalate
- ITO indium tin oxide
- APC AgPdCu
- a hard coat layer 23b is formed to a thickness of 1 ⁇ m on a resin layer 23a made of a biaxially oriented polypropylene (OPP) film having a thickness of 15 ⁇ m, and this is formed on the reflective layer 22 via an adhesive layer 23c having a thickness of 1 ⁇ m.
- the protective layer 23 was formed by laminating on the top.
- the produced infrared reflective functional layer 20 was laminated
- Example 2 A transparent layer 22b made of indium titanium oxide (ITO) is formed on the base material 21 with a thickness of 31 nm, and a translucent metal layer 22a made of APC (AgPdCu) is formed thereon with a thickness of 14 nm.
- Example 1 is the same as Example 1 except that a transparent layer 22c made of indium titanium oxide (ITO) is formed to a thickness of 31 nm.
- Example 3 A transparent layer 22b made of indium titanium oxide (ITO) is formed on the substrate 21 with a thickness of 31 nm, and a translucent metal layer 22a made of APC (AgPdCu) is formed thereon with a thickness of 18 nm.
- Example 1 is the same as Example 1 except that a transparent layer 22c made of indium titanium oxide (ITO) is formed to a thickness of 31 nm.
- Example 4 Using the same base material 21 as in Example 1, a transparent layer 22b made of indium zinc oxide (IZO) is formed on one surface 21a of the base material 21 with a thickness of 30 nm, and AP (AgPd) is made thereon. A semi-transparent metal layer 22a was formed with a thickness of 14 nm, and a transparent layer 22c made of indium zinc oxide (IZO) was formed thereon with a thickness of 30 nm. A resin layer 23a was formed on the reflective layer 22 by a coating method.
- IZO indium zinc oxide
- a hydrogenated nitrile rubber (trade name “Terban 5065” manufactured by LANXESS [k: 33.3, l: 63, m: 3.7, R1 to R3: H] is manufactured on the reflective layer 22.
- a 10% methyl ethyl ketone (MEK) solution was applied using an applicator, placed in an air-circulating drying oven, and dried for 2 minutes at 120 ° C.
- MEK methyl ethyl ketone
- the electron beam was irradiated from the surface side of the resin layer using an electron beam irradiation apparatus (product name “EC250 / 30/20 mA” manufactured by Iwasaki Electric Co., Ltd.) to form the resin layer 23a.
- the line speed was 3 m / min, the acceleration voltage was 150 kV, and the irradiation dose was 100 kGy.
- the same hard coat layer 23b as in Example 1 was laminated in the same manner as in Example 1 to form the protective layer 23.
- substrate with an infrared reflective function was carried out similarly to Example 1, and produced the translucent board
- Example 1 is the same as Example 1 except that an adhesive layer is formed with a thickness of 25 ⁇ m on the hard coat layer 23b and a PET layer is formed with a thickness of 50 ⁇ m thereon.
- Example 3 is the same as Example 3 except that the protective layer 23 is not formed.
- the solar heat acquisition rate is based on the rate at which near infrared rays pass through the green glass 10 (sunlight transmittance) and the rate at which far infrared rays pass through the green glass 10 by re-radiation (sunlight absorption rate). ing. More specifically, the solar heat acquisition rate is the sum of the radiant flux of the solar radiation that is transmitted through the glass portion and the heat flux that is absorbed by the glass and transmitted to the indoor side, with respect to the solar radiation that is perpendicularly incident on the glass surface. , Expressed as the ratio of incident solar radiation to radiant flux. The visible light transmittance is expressed as a ratio of the transmitted light beam to the incident light beam with respect to the daylight beam incident perpendicularly to the glass surface.
- the solar transmittance, solar reflectance, solar absorption rate, and visible light transmittance were measured according to JIS R3106 using a Hitachi spectrophotometer U4100.
- the light incident surface was a glass surface.
- the method for measuring the vertical emissivity is as follows. Using a Fourier transform infrared spectroscopic (FT-IR) apparatus (manufactured by Varian) equipped with a variable angle reflection accessory, the regular reflectance of infrared light with a wavelength of 5 microns to 25 microns was measured, and JISR 3106-2008 It calculated
- the light incident surface was from the infrared reflective functional layer 20 side.
- the green glass 10 and the infrared reflection function are measured by measuring the vertical emissivity of the surface of the infrared reflection functional layer 20 on the protective layer 23 side of far infrared rays re-radiated from the infrared reflection functional layer 20 to the indoor side.
- the radiation characteristics of far infrared rays re-radiated from the layer 20 to the indoor side were examined. These results are shown in Table 1.
- each of Examples 1 to 4 and Comparative Examples 1 and 3 was subjected to a scratch resistance evaluation test.
- the first test and the second test were performed.
- a ten-point pen tester was used, steel wool (Bonster # 0000) was used as the rubbing means, and the rubbing means was brought into contact with the specimen (Examples and Comparative Examples).
- a test of reciprocating 10 times while applying a load of is performed.
- a Gakushin abrasion tester is used, and cloth (Kanakin No. 3) is used as the rubbing means.
- the rubbing means is brought into contact with the specimen (Example and Comparative Example), and a load of 500 g is used.
- the solar radiation absorption rates in the light-transmitting substrates with infrared reflection functions of Examples 1 to 4 were 50.2%, 50.5%, 56.4%, respectively. 51.9%, which is higher than the solar radiation absorption rate (35.4%) of the green glass 10 alone of Comparative Example 2.
- the visible light transmittances in the light-transmitting substrates with infrared reflection functions of Examples 1 to 4 are 68.8%, 67.6%, 57.6%, and 67.1%, which is lower than the visible light transmittance (81.0%) of the green glass 10 alone of Comparative Example 2.
- the vertical emissivity of the green glass 10 alone of Comparative Example 2 shows a value (0.88) significantly higher than 0.50, and the rate of re-radiation of far-infrared rays from the green glass 10 into the room is increased. Yes.
- the vertical emissivities of the light-transmitting substrates with infrared reflection functions of Examples 1 to 4 are values significantly lower than 0.50 (0.26, 0.22, 0.19, 0.12 respectively). ), The rate at which far-infrared rays are re-radiated from the green glass 10 to the outside increases.
- the ratio of re-radiation of far infrared rays from the green glass 10 into the room is low (the far infrared radiation characteristics are good) and good. Shows thermal insulation.
- the solar transmittance of the green glass 10 of Comparative Example 2 is 58.5%, whereas the solar transmittance of the light-transmitting substrates with infrared reflecting functions of Examples 1 to 4 is 39. 3%, 38.5%, 31.0%, and 36.3%.
- the translucent substrates with infrared reflection functions of Examples 1 to 4 by providing the infrared reflection functional layer 20 on the green glass 10, the solar radiation transmittance is significantly reduced as compared with the case of the green glass 10 alone. It has become. Therefore, the translucent substrates with infrared reflection functions of Examples 1 to 4 exhibit good reflection performance (heat shielding properties) of sunlight (near infrared rays).
- both the solar radiation transmittance and the vertical emissivity are better than those of the green glass 10 of Comparative Example 2 alone.
- the thickness of the semi-transparent metal layer 22a which consists of APC (AgPdCu) is thick ( 14 ⁇ m and 18 ⁇ m, respectively). Accordingly, in the translucent substrates with infrared reflection function of Examples 1, 2, and 3, the value of solar transmittance gradually decreases in that order (as the thickness of the semitransparent metal layer 22a increases) ( 39.3%, 38.5%, and 31.0%, respectively).
- the value of the vertical emissivity is also decreasing gradually in that order (as the thickness of the semi-transparent metal layer 22a becomes thick, respectively). 0.26, 0.22, 0.19). From these results, it can be seen that the thicker the translucent metal layer 22a, the lower the solar transmittance and the vertical emissivity, and the higher the effect of suppressing the temperature rise.
- the adhesion layer is formed in the thickness of 25 micrometers on the hard-coat layer 23b, and the PET layer is formed in the thickness of 50 micrometers on it. Therefore, although the solar radiation transmittance shows the same value as that of the translucent substrate with the infrared reflecting function of Examples 1 to 3, the vertical emissivity is a value significantly higher than 0.50 (0.85). Show. For this reason, in the translucent board
- Comparative Example 3 the solar transmittance, solar reflectance, solar absorption rate, solar heat acquisition rate, and visible light transmittance showed the same values as those of the light-transmitting substrates with infrared reflecting function of Examples 1 to 4.
- Comparative Example 3 since the protective layer 23 was not formed, the vertical emissivity shows a value significantly lower than 0.50 (0.03), but the reflective layer 20 with low scratch resistance is exposed. Therefore, as shown below, the problem of poor durability remains.
- Example 5 Two light vehicles of the same kind were prepared, and the infrared reflection functional layer (infrared reflection film) 20 used in Example 1 was attached to the indoor side of all the window glasses of the light vehicle. Then, the cooling intensity of the air conditioner installed in the vehicle was set to 5 out of 6 stages, and the air volume of the air conditioning was set to 5 out of 8 stages to circulate the inside air. Then, with the front of the light vehicle stopped toward the southwest, the mannequin is placed on the driver seat side of the rear seat, and the surface temperature of the mannequin is measured by thermography (in Table 2 and Table 3 below, the interior (thermography) Measured).
- the space temperature of about 5 cm indoor side from the driver seat side window of the rear seat (in Tables 2 and 3 below, referred to as the interior of the vehicle (at the window)) was measured with a thermocouple coated with aluminum foil.
- the temperature of the indoor side surface of the window (the surface of the infrared reflecting film 20 or the surface of the green glass 10) (in the following Tables 2 and 3, referred to as the vehicle interior (window surface)) was measured with a thermocouple. Note that the measurement was performed on August 11, 2011 at 13:30.
- Example 5 is the same as Example 5 except that the infrared reflective functional layer (infrared reflective film) 20 used in Comparative Example 1 is attached to the indoor side of all the window glasses of the minicar. These results are shown in Table 2.
- Example 5 is lower in the vehicle (thermography) and in the vehicle (by the window) than the result of Comparative Example 4.
- the infrared emissivity function used in Comparative Example 4 is the vertical emissivity (0.26) of the infrared reflective functional layer (infrared reflective film) 20 used in Example 5 (same as Example 1). It was confirmed that the temperature rise suppression effect in the vehicle (thermography) and in the vehicle (by the window) due to being significantly lower than the vertical emissivity (0.85) of the layer (infrared reflective film) 20 was high.
- Example 6 The same measurement as in Example 5 was performed except that the front of the light vehicle was stopped toward the south. The measurement was performed at 15:30 on August 14, 2011.
- Example 6 is the same as Example 6 except that the infrared reflective functional layer (infrared reflective film) 20 is not provided. These results are shown in Table 3.
- Example 6 since the infrared reflective functional layer (infrared reflective film) 20 used in Example 1 is affixed to the indoor side of all the window glass of the mini vehicle, the infrared reflective functional layer (infrared reflective film) 20 is used. Compared to Comparative Example 5 that was not provided, it was confirmed that the temperature rise suppression effect in the vehicle (thermography) and in the vehicle (by the window) due to low solar transmittance and vertical emissivity was high.
- the translucent substrate with an infrared reflecting function according to the present embodiment is formed to make it difficult to see the room from the outside through the translucent substrate layer, for example, for the purpose of providing privacy protection.
- the translucent substrate with an infrared reflecting function according to the present embodiment is disposed so as to separate the room from the outside, and the translucent substrate layer having a visible light transmittance of 50% or more, and the translucent substrate layer And an infrared reflection functional layer having a visible light transmittance of 50% or less, which is laminated on the indoor surface.
- the visible light transmittance of the translucent substrate layer is 50% or more, and the visible light transmittance of the infrared reflecting functional layer 20 is 50. Since the configuration is the same as that of the translucent substrate with the infrared reflection function according to the first embodiment except that it is% or less, the same configuration is denoted by the same reference numeral and detailed description is given. Do not repeat.
- the solar absorptivity of the translucent substrate layer according to this embodiment is 30% or more.
- Examples of such a translucent substrate layer include glass and a transparent resin substrate.
- a smoke film is employed for the infrared reflective functional layer according to the present embodiment.
- a smoke film is employed as the infrared reflection functional layer, but the present invention is not limited to this, and the visible light transmittance may be 50% or less.
- the infrared reflection functional layer includes a reflection layer for reflecting infrared rays, and a protective layer laminated on the indoor side surface of the reflection layer.
- the vertical emissivity of the protective layer side surface of the infrared reflective functional layer is set to 0.50 or less.
- the visible light transmittance of the translucent substrate layer according to the present embodiment is 50% or more as described above, and compared with the translucent substrate layer of the translucent substrate with infrared reflection function according to the first embodiment.
- the solar absorptivity of the translucent substrate layer itself is lowered, but the solar transmissivity of the translucent substrate layer itself is increased.
- solar radiation transmittance is reduced by the infrared reflective functional layer. Therefore, it is possible to suppress sunlight (near infrared rays) that is directly incident on the room from the outside through the light-transmitting substrate layer.
- the infrared reflective functional layer is formed on the translucent substrate layer.
- the solar radiation absorptivity is increased.
- far infrared rays absorbed by the translucent substrate layer from the translucent substrate layer to the indoor side Since re-radiant heat due to far-infrared rays re-radiated to the sun is suppressed, the temperature rise in the room can be suppressed.
- an infrared reflective functional layer with a low visible light transmittance is laminated on a light transmissive substrate layer with a high visible light transmittance, it is difficult to see the room from the outside through the light transmissive substrate layer, for example, providing privacy protection can do.
- substrate with an infrared reflective function which concerns on this invention is not limited to said each embodiment, A various change is possible in the range which does not deviate from the summary of this invention.
- the reflective layer 2 is formed by vapor deposition.
- the reflective layer is prepared separately from the base material, such as using a reflective film, and the reflective layer is attached to the base material. You may make it do.
- the infrared reflective functional layer (infrared reflective film) is laminated (attached) to the translucent substrate layer via the adhesive layer, but is not limited thereto.
- an infrared reflection functional layer may be directly formed on the light transmissive substrate layer.
- the protective layer is formed by laminating a hard coat layer on the resin layer, but the protective layer may be a resin layer, more specifically, an olefin resin layer alone, Only the hard coat layer may be used. However, from the viewpoint of scratch resistance, the protective layer preferably includes a hard coat layer.
- the resin layer is bonded to the surface of the reflective layer using an adhesive, but the present invention is not limited to this.
Abstract
Description
前記透光性基板層の日射吸収率が30%以上であり、前記赤外線反射機能層は、赤外線を反射するための反射層と、該反射層の室内側の表面に積層される保護層とを含み、前記保護層側表面の垂直放射率が0.50以下である。
本実施形態に係る赤外線反射機能付き透光性基板は、遮熱及び断熱を目的として形成されている。図1に示すように、赤外線反射機能付き透光性基板は、室内と室外とを隔てるように配置される透光性基板層10と、該透光性基板層10の室内側の表面に積層される赤外線反射機能層20とを備える。なお、図1においては、便宜上、赤外線反射機能層20の厚みに対して、透光性基板層10の厚みを実際の厚みより薄く図示している。
繰り返し数kとしては、10~1000が好ましい。
また、化学式Iの繰り返し単位AとBとCの各総重量の比率は、A:B:C=5~50重量%:25~85重量%:0~60重量%(但し、AとBとCの合計は100重量%)となるのが好ましい。より好ましくは、A:B:C=15~40重量%:55~85重量%:0~20重量%(但し、AとBとCの合計は100重量%)である。さらに好ましくは、A:B:C=25~40重量%:55~75重量%:0~10重量%(但し、AとBとCの合計は100重量%)である。
厚みが50μmのポリエチレンテレフタレート(PET)フィルムを基材21として用いた。また、基材21の上に酸化インジウムスズ(ITO)からなる透明層22bを35nmの厚みで形成し、その上にAPC(AgPdCu)からなる半透明金属層22aを11.5nmの厚みで形成し、その上に酸化インジウムスズ(ITO)からなる透明層22cを35nmの厚みで形成し、これを反射層22とした。また、厚みが15μmの2軸延伸ポリプロピレン(OPP)フィルムからなる樹脂層23aの上にハードコート層23bを1μmの厚みで形成し、これを厚みが1μmの接着層23cを介して反射層22の上に積層し、保護層23を形成した。そして、作製された赤外線反射機能層20を厚みが12μmの粘着層を介して厚みが3.86mmのグリーンガラス10の上に積層し、赤外線反射機能付き透光性基板を作製した。
基材21の上に酸化インジウムチタン(ITiO)からなる透明層22bを31nmの厚みで形成し、その上にAPC(AgPdCu)からなる半透明金属層22aを14nmの厚みで形成し、その上に酸化インジウムチタン(ITiO)からなる透明層22cを31nmの厚みで形成した点以外は、実施例1と同じである。
基材21の上に酸化インジウムチタン(ITiO)からなる透明層22bを31nmの厚みで形成し、その上にAPC(AgPdCu)からなる半透明金属層22aを18nmの厚みで形成し、その上に酸化インジウムチタン(ITiO)からなる透明層22cを31nmの厚みで形成した点以外は、実施例1と同じである。
実施例1と同じ基材21を用い、この基材21の一方の面21aに、酸化インジウム亜鉛(IZO)からなる透明層22bを30nmの厚みで形成し、その上にAP(AgPd)からなる半透明金属層22aを14nmの厚みで形成し、その上に酸化インジウム亜鉛(IZO)からなる透明層22cを30nmの厚みで形成し、これを反射層22とした。
また、反射層22の上に、塗工法により樹脂層23aを形成した。具体的には、反射層22の上に、水素化ニトリルゴム(ランクセス社製 商品名「テルバン5065」〔k:33.3、l:63、m:3.7、R1~R3:H〕の10%メチルエチルケトン(MEK)溶液をアプリケータを用いて塗布し、空気循環式の乾燥オーブンに入れ、120℃で2分間乾燥を行った。これにより、厚さが5μmの樹脂層を形成した。その後、電子線照射装置(岩崎電気株式会社製 製品名「EC250/30/20mA」)を用いて樹脂層の表面側から電子線を照射し、樹脂層23aを形成した。電子線の照射条件は、ライン速度を3m/min、加速電圧を150kV、照射線量を100kGyとした。
そして、樹脂層23aの上に、実施例1と同じハードコート層23bを実施例1と同様に積層して、保護層23を形成した。
それ以外は実施例1と同様にして、赤外線反射機能付き透光性基板を作製した。
ハードコート層23bの上に粘着層を25μmの厚みで形成し、その上にPET層を50μmの厚みで形成した点以外は、実施例1と同じである。
グリーンガラス10のみを用いた。
保護層23を形成しない点以外は、実施例3と同じである。
そして、実施例1~4、比較例1~3のそれぞれについて、上記実施形態に係る赤外線反射機能付き透光性基板における日射透過率、日射反射率、垂直放射率、日射熱取得率及び可視光透過率を測定した。日射透過率(日射反射率)は、ガラス面に垂直に入射する日射の放射束について、透過放射束(反射放射束)の日射放射束に対する比として表される。そして、得られた日射透過率、日射反射率の値を用いて、日射吸収率を算出した。具体的には、日射吸収率は、100%-(日射透過率+日射反射率)として算出した。また、日射熱取得率は、近赤外線がグリーンガラス10を透過する割合(日射透過率)と、遠赤外線が再放射によってグリーンガラス10を透過する割合(日射吸収率)とに基づいたものとなっている。より具体的には、日射熱取得率は、ガラス面に垂直に入射する日射について、ガラス部分を透過する日射の放射束と、ガラスに吸収されて室内側に伝達される熱流束との和の、入射する日射の放射束に対する比として表される。そして、可視光透過率は、ガラス面に垂直に入射する昼光の光束について、透過光束の入射光束に対する比として表される。
表1より、日射吸収率の観点から見ると、実施例1~4の赤外線反射機能付き透光性基板における日射吸収率は、それぞれ、50.2%,50.5%,56.4%,51.9%であり、比較例2のグリーンガラス10単体の日射吸収率(35.4%)より高くなっている。また、可視光線透過率の観点から見ると、実施例1~4の赤外線反射機能付き透光性基板における可視光線透過率は、それぞれ、68.8%,67.6%,57.6%,67.1%であり、比較例2のグリーンガラス10単体の可視光線透過率(81.0%)より低くなっている。しかしながら、比較例2のグリーンガラス10単体の垂直放射率は、0.50より有意に高い値(0.88)を示し、グリーンガラス10から室内への遠赤外線の再放射の割合が高くなっている。その一方で、実施例1~4の赤外線反射機能付き透光性基板における垂直放射率は、0.50より有意に低い値(それぞれ、0.26,0.22,0.19,0.12)を示すことから、遠赤外線がグリーンガラス10から室外に再放射される割合が高くなる。それに伴って、実施例1~4の赤外線反射機能付き透光性基板では、グリーンガラス10から室内への遠赤外線の再放射の割合が低くなり(遠赤外線の放射特性が良好となり)、良好な断熱性を示す。
そして、耐擦傷性の評価試験の結果については、比較例3の赤外線反射機能付き透光性基板では、保護層23を形成しなかったため、耐擦傷性試験の第一の試験と第二の試験とにおいて良好な結果が得られなかったのに対して、実施例1~4の赤外線反射機能付き透光性基板、及び比較例1の赤外線反射機能付き透光性基板では、良好な耐擦傷性を示した。これにより、赤外線反射機能付き透光性基板が保護層を備えることで、耐擦傷性の低い反射層が露出することがなく、良好な耐久性(耐擦傷性)を有することが分かった。
同種の軽自動車を2台準備し、該軽自動車の全ての窓ガラスの室内側に実施例1で用いた赤外線反射機能層(赤外線反射フィルム)20を貼り付けた。そして、車内に設置された空調の冷房強度を6段階中の5段階に設定するとともに、空調の風量を8段階中の5段階に設定し、内気循環させた。そして、軽自動車の前方を南西に向けて停車させた状態で、後部座席の運転席側にマネキンを乗せ、サーモグラフィでマネキンの表面の温度(以下の表2及び表3中では、車内(サーモグラフィ)という)を測定した。また、後部座席の運転席側の窓から約5cm室内側の空間温度(以下の表2及び表3中では、車内(窓際)という)をアルミ箔で被覆した熱電対で測定した。さらに、窓の室内側の表面(赤外線反射フィルム20の表面又はグリーンガラス10の表面)(以下の表2及び表3中では、車内(窓表面)という)の温度を熱電対で測定した。なお、測定は、2011年8月11日13時30分に行った。
軽自動車の全ての窓ガラスの室内側に比較例1で用いた赤外線反射機能層(赤外線反射フィルム)20を貼り付けた点以外は、実施例5と同じである。これらの結果を表2に示す。
軽自動車の前方を南に向けて停車させた点以外は、実施例5と同様の測定を行った。なお、測定は、2011年8月14日15時30分に行った。
赤外線反射機能層(赤外線反射フィルム)20を設けなかった点以外は、実施例6と同じである。これらの結果を表3に示す。
以下、本発明に係る赤外線反射機能付き透光性基板の第二の実施形態について説明する。
Claims (8)
- 室内と室外とを隔てるように配置される透光性基板層と、該透光性基板層の室内側の表面に積層される赤外線反射機能層とを備え、
前記透光性基板層の日射吸収率が30%以上であり、
前記赤外線反射機能層は、赤外線を反射するための反射層と、該反射層の室内側の表面に積層される保護層とを含み、
前記保護層側表面の垂直放射率が0.50以下である
赤外線反射機能付き透光性基板。 - 室内と室外とを隔てるように配置され、可視光線透過率が50%以上である透光性基板層と、該透光性基板層の室内側の表面に積層され、可視光線透過率が50%以下である赤外線反射機能層とを備え、
前記透光性基板層の日射吸収率が30%以上であり、
前記赤外線反射機能層は、赤外線を反射するための反射層と、該反射層の室内側の表面に積層される保護層とを含み、
前記赤外線反射機能層の前記保護層側表面の垂直放射率が0.50以下である
赤外線反射機能付き透光性基板。 - 前記赤外線反射機能層は、前記透光性基板層の室内側の表面に貼付される赤外線反射フィルムである請求項1に記載の赤外線反射機能付き透光性基板。
- 前記赤外線反射機能層は、前記透光性基板層の室内側の表面に貼付される赤外線反射フィルムである請求項2に記載の赤外線反射機能付き透光性基板。
- 前記透光性基板層は、ガラス又は樹脂基板である請求項1に記載の赤外線反射機能付き透光性基板。
- 前記透光性基板層は、ガラス又は樹脂基板である請求項2に記載の赤外線反射機能付き透光性基板。
- 前記保護層は、前記反射層に積層されるハードコート層を含む請求項1に記載の赤外線反射機能付き透光性基板。
- 前記保護層は、前記反射層に積層されるハードコート層を含む請求項2に記載の赤外線反射機能付き透光性基板。
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Publication number | Publication date |
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EP2865519A1 (en) | 2015-04-29 |
JPWO2013191285A1 (ja) | 2016-05-26 |
KR102041003B1 (ko) | 2019-11-05 |
CN104411486A (zh) | 2015-03-11 |
CN104411486B (zh) | 2017-07-21 |
EP2865519A4 (en) | 2016-01-20 |
JP6326368B2 (ja) | 2018-05-16 |
KR20150023769A (ko) | 2015-03-05 |
US20150192716A1 (en) | 2015-07-09 |
EP2865519B1 (en) | 2017-08-09 |
ES2639557T3 (es) | 2017-10-27 |
US9477023B2 (en) | 2016-10-25 |
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