JP2016148689A - Sunlight reflection panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sunlight reflection panel with high corrosion resistances to oxygen, water vapor, or harmful gas.SOLUTION: The sunlight reflection panel according to the present application includes a sunlight reflection layer containing at least a metal reflection layer on a substrate. The region of the panel which covers the side surfaces and at least one of the upper surface edge and the lower surface edge is covered with a continuous structure made of resin material for coating.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a solar reflective panel, and more particularly to a solar reflective panel having a sealing member at an end and improved durability (corrosion resistance).

  With rapid economic growth in developing countries, energy demand is increasing worldwide, and depletion of fossil fuels such as oil and natural gas, which was once thought to be inexhaustible, has become a reality.

  Based on this situation, solar energy is attracting attention as the most stable and abundant natural energy supply as an alternative energy to fossil fuels, and various studies are currently underway to utilize the solar energy. Has been made. In particular, there is a vast desert near the equator, which is said to be the world's sun belt, and the solar energy that falls here is truly inexhaustible. In addition, it is believed that energy of as much as 7,000 GW can be obtained by utilizing solar energy in an area of only a few percent of the desert spreading in the southwestern United States. It is also believed that all humanity can provide all the energy it needs by using solar energy that is applied to only a few percent of the desert in the Arabian Peninsula and North Africa.

  Thus, although solar energy is a very powerful alternative energy, in the stage of practical use, (1) the energy density of the solar energy itself is low, and (2) storage and transfer of solar energy Difficulty is considered a problem.

  Among the above problems, the problem (1) that the energy density of the solar energy is low can be solved by collecting sunlight using a huge light collecting device.

  Since this condensing device is exposed to ultraviolet rays from sunlight, heat in the environment where it is installed, wind and rain, sandstorms, etc., a solar reflective panel provided with a glass mirror has been conventionally used. However, glass mirrors are highly durable against the environment, but they are prone to breakage during transportation, and the strength of the mount on which the mirrors are installed increases the construction costs of the light collecting device.

  In order to solve the above problem, a method of replacing a glass mirror with a resin reflection sheet has been studied (for example, see Patent Document 1). Moreover, in order to provide high scratch resistance and weather resistance to a resin mirror, a method of applying a hard coat layer to a resin mirror is disclosed (for example, see Patent Document 2).

  However, when a metal such as silver is used for the reflection layer of the resin mirror, 1. through a resin layer on the reflective surface or the surface facing the reflective surface, or Application is difficult because oxygen, water vapor, hydrogen sulfide, or the like permeates into the resin mirror through the interface between the reflection layer at the end and the outside, and the reflection layer is corroded.

  Regarding the corrosion of the reflective layer through the resin layer on the reflective surface or the surface facing the reflective surface, a method of providing an inorganic oxide layer as a barrier layer on the light source side of the reflective layer (for example, see Patent Document 3) Some degree of correspondence is possible.

  However, in the case of a glass mirror or a resin mirror, the corrosion of the reflective layer due to the penetration of oxygen, water vapor, hydrogen sulfide, or the like into the reflective layer from its end is generally protected with a sealing tape or the like. Although measures such as these have been taken, it is difficult to say that it is sufficient for long-term use in harsh environments.

JP 2005-59382 A International Publication No. 2011 / 096309A Japanese Patent No. 3311172

  This invention is made | formed in view of the said problem, The solution subject is to provide the solar reflective panel which has high corrosion resistance with respect to oxygen, water vapor | steam, or harmful gas.

  As a result of intensive studies in view of the above problems, the present inventor is a solar reflective panel having a solar reflective layer including at least a metal reflective layer on a substrate, and the solar reflective panel The region including the side surface portion and at least one of the upper surface end portion and the lower surface end portion is covered with an integrated continuous sealing structure with a coating resin material without having a joint. It is found that a solar reflective panel having high corrosion resistance can be provided by preventing the solar reflective panel from entering the solar reflective panel of oxygen, water vapor, or harmful gas. The present invention has been reached.

  That is, the said subject of this invention is solved by the following means.

1. A solar reflective panel having a solar reflective layer including at least a metal reflective layer on a substrate,
A solar reflective panel, wherein a region including all side portions and at least one of an upper end portion and a lower end portion is covered with a continuous structure formed of a coating resin material.

  2. The solar reflective panel according to item 1, wherein the coating resin material is at least one resin selected from silicone resin, urethane resin, and acrylic resin.

  3. The solar reflective panel according to item 1 or 2, wherein a hard coat layer containing a polymer having a metalloxane skeleton is provided on the outermost surface on the sunlight incident surface side.

  By means of the above-described means of the present invention, the solar reflective panel having high corrosion resistance is sealed by sealing the constituent members of the solar reflective panel with a continuous sealing structure and blocking the influence from the external environment. Can be obtained.

The reason why the above problem can be solved by the configuration defined in the present invention is presumed to be as follows.
By applying a sealing method using a tape that has been used in the past, or by applying multiple times, a sealing material is applied to the side surface part and a sealing material is applied to the upper and lower parts separately to create a joint in the sealing structure. In the sealing method we have, stress is concentrated on the tape bonding surface and the joint of the sealing part formed multiple times due to the influence of bending and harsh external environment. A gap has occurred and the sealing performance has been lowered.

  As a result of studying the cause of the above problem, the inventors of the present invention constitute a solar reflective panel. For example, for all peripheral parts of a film mirror panel, a side surface, an upper surface edge, and a lower surface edge Stable sealing is achieved even in various environments by forming the sealing structure by integrally forming the region including at least one of the joints in one forming process without joints (joint surfaces) As a result, a solar reflective panel with high corrosiveness could be realized.

Sectional drawing which shows an example of a structure of the solar reflective panel of this invention provided with the continuous sealing structure by the resin material for coating | cover The schematic perspective view which shows an example of a structure of the panel for sunlight reflection of this invention Sectional drawing which shows an example of the layer structure of the sunlight reflective layer which comprises the panel for sunlight reflection of this invention Schematic which shows an example of the method of forming the continuous sealing structure in the edge part of this invention Schematic showing an example of another method for forming an end continuous sealing structure of the present invention Schematic which shows an example of the formation method of the independent sealing structure in the edge part of a comparative example

  The solar reflective panel of the present invention has a solar reflective layer including at least a metal reflective layer on a substrate, and an area including all side portions and at least one of an upper end portion and a lower end portion. Further, it is characterized in that it is coated with a continuous structure formed of a coating resin material. This feature is a technical feature common to the inventions according to claims 1 to 3.

  As an embodiment of the present invention, the coating resin material is at least one resin selected from a silicone resin, a urethane resin, and an acrylic resin, from the viewpoint that the intended effect of the present invention can be further expressed. It is preferable from a viewpoint with higher adhesion affinity with the surface side member, back surface side member, and side part which comprise the solar light reflection panel.

  In addition, an embodiment having a hard coat layer containing a polymer having a metalloxane skeleton on the outermost surface on the sunlight incident surface side realizes high surface hardness, and has excellent resistance to sand and surface cleaning in the external environment, for example, deserts. It is preferable from the viewpoint of obtaining rubbing properties.

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

《Basic configuration of solar reflective panel》
The solar reflective panel of the present invention has a solar reflective layer including at least a metal reflective layer on a substrate, and an area including all side portions and at least one of an upper end portion and a lower end portion. Further, it is characterized in that it is coated with a continuous structure formed of a coating resin material.

  FIG. 1 is a cross-sectional view showing an example of the configuration of the solar reflective panel of the present invention having a continuous sealing structure made of a coating resin material.

  In FIG. 1, a solar reflective panel 1 has a configuration in which a solar reflective layer 3 and a hard coat layer 4 as an outermost layer are provided on a substrate 2 (hereinafter, this configuration group is also referred to as a mirror panel unit U). is there.

  As the base material 2, a resin base material is preferably applied, but for the purpose of imparting rigidity to the mirror panel, it is applied by being bonded to a glass base material or a metal base material via an adhesive layer or an adhesive layer. You can also.

  At the end of the mirror panel unit U having the configuration shown in FIG. 1, the cross section of the sunlight reflecting layer 3 is in an exposed state, and the sun is exposed to harmful gases such as oxygen, water vapor or hydrogen sulfide from the external environment. There is a possibility that the metal constituting the light reflection layer 3, for example, a silver film or the like may corrode.

In the present invention, based on the above problem, the region including all the side surface portions Z constituting the end portion of the mirror panel unit U and at least one of the upper surface end portion X and the lower surface end portion Y is made of the coating resin material. The sealing structure 5 covered with an integrated seamless structure is formed.
In the present invention, as illustrated in FIG. 1 and FIG. 2 described later, the U-shaped sealing structure 5 is formed in the entire region of the side surface portion Z, the upper surface end portion X, and the lower surface end portion Y. Or it may be the L-shaped sealing structure 5 comprised from the area | region containing all the side parts Z and any one of the upper surface edge part X and the lower surface edge part Y.

  In FIG. 1, the side surface portion Z, the upper surface end portion X, and the lower surface end portion Y of the peripheral portion of the mirror panel unit U configured to have the sunlight reflecting layer 3 and the hard coat layer 4 as the outermost layer on the base material 2. Although the example which formed the sealing member 5 with respect to the whole area | region was shown, Furthermore, after affixing the mirror panel unit U on a metal base material via the adhesion layer, the side part Z of a peripheral part, an upper surface edge part The sealing member 5 is formed in the entire region of X and the lower surface end Y, or the sealing member 5 is formed of a region including all the side surfaces Z and either the upper surface end X or the lower surface end Y. The structure which forms the structure 5 may be sufficient.

  FIG. 2 is a schematic perspective view showing an example of the configuration of the solar reflective panel of the present invention.

  FIG. 2 is a perspective view of the solar reflective panel 1 having the sealing structure 5 shown in FIG. 1, in which the entire peripheral region of the mirror panel unit U including the hard coat layer 4 is integrated with a coating resin material. 5 is formed. As described above, an L-shaped configuration in which a region including the entire peripheral portion and one of the upper surface end X and the lower surface end Y is sealed may be used.

《Basic configuration of solar reflective layer》
In FIG. 3, an example of the layer structure of the sunlight reflection layer 3 which comprises the panel 1 for sunlight reflection of this invention is shown.

  As a preferable basic configuration of the sunlight reflecting layer 3 according to the present invention, a corrosion preventing layer 7 for the purpose of preventing metal corrosion of the metal reflecting layer, an adhesive layer 8 and a functional layer on the metal reflecting layer 6. An ultraviolet absorbing layer (UV absorbing layer) 9 is laminated. In order to suppress damage to the metal reflection layer 6 and the base material 2 due to ultraviolet rays, the ultraviolet absorption layer 9 includes an ultraviolet absorbent, an acrylic resin film containing a HALS agent, an ultraviolet reflective multilayer film, and the like. .

  An undercoat layer 10 can be provided on the back side of the metal reflective layer 6.

  In the configuration as described above, in the present invention, the laminate that is composed of at least the base material 2 and the sunlight reflecting layer 3 and before the sealing structure 5 is provided is defined as “mirror panel unit U”. A panel structure U having a sealing structure 5 formed in an area composed of all side portions Z and at least one of an upper end X and a lower end Y, or “mirror panel unit U” is bonded. After bonding on a metal substrate through a layer, what is formed with the sealing structure 5 in a region constituted by all the side surface portions Z and at least one of the upper surface end portion X and the lower surface end portion Y is “sun” It is defined as “light reflecting panel”.

  Further, the upper surface end portion, the lower surface end portion and the entire side surface portion constituting the end portion of the mirror panel unit U, or all the side surface portions Z, and at least one of the upper surface end portion X and the lower surface end portion Y are configured. A region formed by covering a region to be covered with an integrated continuous structure 5 with a coating resin material is referred to as a “sealing structure” or “sealing portion”.

  Further, the structure in which the region constituted by all the side surface portions Z and at least one of the upper surface end portion X and the lower surface end portion Y referred to in the present invention is continuously covered with the coating resin material is A region means that all regions are formed in a single process in a continuous integrated configuration in the absence of a joint.

《Constituent material of solar reflective panel》
[Resin material for coating: sealing part forming member]
In the present invention, the region composed of all the side surface portions Z of the mirror panel unit U and at least one of the upper surface end portion X and the lower surface end portion Y is covered with a continuous resin material for covering, A sealing structure is formed.

  The resin material for coating according to the present invention is not particularly limited, but from the viewpoint of ease of formation, gas barrier properties as a sealing material, durability, etc., a general curable resin, for example, thermosetting A resin, an active energy ray-curable resin, or a thermoplastic resin can be appropriately selected and used.

  Examples of the thermoplastic resin include polyethylene, polypropylene, ABS resin, PMMA (polymethyl methacrylate), polystyrene, polycarbonate, polycycloolefin (ZEONOR of Nippon Zeon Co., Ltd., Arton of JSR Corp., TOPAS of Polyplastic Corp., Mitsui) Apel manufactured by Kagaku Co.), polylactic acid, cellulose ester, polyethersulfone, polyetherimide, polyetheretherketone, polyphenylene sulfide, polyphenylene oxide, polycaprolactone, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polypropylene terephthalate, Polybutylene succinate, poly [3-hydroxybutyrate], polyarylate, nylon, aramid, thermoplastic elastomer Ma, such as silicone, and the like.

  Moreover, as a thermosetting resin, an epoxy resin, a melamine resin, an unsaturated polyester resin, a phenol resin etc. are mentioned, for example.

  Examples of the active energy ray curable resin include epoxy acrylate resin, urethane acrylate resin, and polyester acrylate.

  Specifically, Adekaoptomer KR, BY series KR-400, KR-410, KR-550, KR-566, KR-567, BY-320B (above, manufactured by ADEKA Corporation), Koeihard A -101-KK, A-101-WS, C-302, C-401-N, C-501, M-101, M-102, T-102, D-102, NS-101, FT-102Q8, MAG -1-P20, AG-106, M-101-C (manufactured by Guangei Chemical Industry Co., Ltd.), Seika Beam's PHC2210 (S), PHCX-9 (K-3), PHC2213, DP-10, DP- 20, DP-30, P1000, P1100, P1200, P1300, P1400, P1500, P1600, SCR900 (above, manufactured by Dainichi Seika Kogyo Co., Ltd.), KRM703 , KRM7039, KRM7130, KRM7131, UVECRYL29201, UVECRYL29202 (above, Daicel UC Corporation), RC-5015, RC-5016, RC-5020, RC-5031, RC-5100, RC-5102, RC-5120, RC-5122, RC-5152, RC-5171, RC-5180, RC-5181 (manufactured by DIC Corporation), Aulex No. 340 clear (manufactured by China Paint Co., Ltd.), Sun Rad H-601 (manufactured by Sanyo Chemical Industries, Ltd.), SP-1509, SP-1507 (above, Showa Polymer Co., Ltd.), RCC-15C (Grace Japan Co., Ltd.), Aronix M-6100, M-8030, M-8060 (manufactured by Toagosei Co., Ltd.), or other commercially available products can be used as appropriate.

  In addition, from the category of adhesives, acrylic resin adhesives, acrylic resin anaerobic adhesives, acrylic resin emulsion adhesives, α-olefin adhesives, two-component mixed urethane resin adhesives, two-component mixed types Epoxy resin adhesive, chloroprene rubber adhesive, cyanoacrylate adhesive, silicone adhesive, reactive hot melt adhesive, modified silicone adhesive, polyamide adhesive, polyurethane resin hot melt adhesive, polyolefin Examples thereof include a resin hot melt adhesive and a melamine resin adhesive.

  In addition, sealants such as sealants made by Shin-Etsu Silicone Co., Ltd., sealants 45, 4588, 4515, 40N, seal masters 300, 300LS, poor sealants S, KE-3418, KE-42, etc. may also be mentioned. it can.

  The material constituting the coating resin according to the present invention described above is at least one resin selected from silicone resin, urethane resin and acrylic resin, in particular, the surface side constituting the solar reflective panel It is preferable from the viewpoint of higher adhesion affinity with the member, the back surface side member, and the side surface portion.

(Method of applying resin material for coating)
In the present invention, the covering resin material described above is applied to a region including all the side surface portions of the mirror panel unit U and at least one of the upper surface end portion and the lower surface end portion as shown in FIGS. A continuous sealing structure formed of a resin material for coating is formed.

  Examples of the method for applying the coating resin material 5A to the upper surface end X, the lower surface end Y and the side surface Z of the mirror panel unit U include, for example, a roll coating method, a dip method, a casting method, an ink jet method, a spray method, and printing. In addition to the wet process represented by the method, a coating method using a dispenser, a coating method such as a slot method using a slit die coater, and the like can be given.

  As a method of applying the coating resin material, apply a coating liquid in excess of the amount required to form a coating film with the required film thickness, and then remove the excess, then a weighing mold and only the required amount A pre-weighing type in which a coating solution is applied is known. Any coating method can be applied, but the pre-weighing type is preferable from the viewpoints of high accuracy of coating, high speed, thin film, improved coating film quality, suitability for lamination, and the like. Moreover, it is preferable that it is a closed system from a viewpoint of suppression of the exposure of a coating liquid, suppression of a change in concentration, maintenance of cleanliness, and prevention of contamination by foreign matters. Therefore, among the above coating methods, a roll coating method, a dip method, a spray method, and an ink jet method are preferable. From the viewpoint of applicability, a coating solution diluted with a solvent or the like may be used as necessary.

  FIG. 4 shows an example of a method in which a coating resin material is simultaneously applied to all regions of the upper surface end X, the lower surface end Y, and the side surface Z of the mirror panel unit U by the dip method. .

  In a) of FIG. 4, the coating liquid 5A containing the coating resin material is stored in the liquid receiving pan 11 and kept at a constant temperature. The dip coater is configured to have a pair of outer rollers 12A and an inner roller 12B between them. While rotating, the coating liquid 5A containing the coating resin material is applied to the upper surface end X and the lower surface end Y of the mirror panel unit U. And it supplies to the side part Z, and the sealing structure 5 is formed.

  At this time, the film thickness of the sealing structure formed on the upper surface end X and the lower surface end Y is adjusted by the distance H1 between the pair of outer rollers 12A, and the lengths and side surfaces of the upper surface end X and the lower surface end Y are adjusted. The thickness of the part Z can be adjusted by the installation position of the internal roller 12B.

  As a structure of the sealing member 5 which concerns on this invention, it is preferable that it is in the range of 1.0-10.0 mm as length of the edge part X and Y, More preferably, it is 2.0-5.0 mm. Is within the range.

  Moreover, it is preferable that the thickness of the sealing member 5 exists in the range of 0.1-1.0 mm.

  FIG. 4b) is a side view when viewed from the cut surface A-A direction of the diagram shown in FIG. 4a), while the mirror panel unit U is conveyed from the left to the right of the page. The coating liquid 5A containing the coating resin material is applied by the dipping method to form the sealing structure 5, but from the viewpoint of more accurately controlling the film thickness and the like, the upstream where the coating liquid is applied to the mirror panel unit U. A scraper blade 13 for controlling the film thickness is preferably provided on the side.

Further, on the downstream side, when the applied coating resin material is a thermoplastic resin, it may be solidified by supplying cold air from the energy applying unit 14. Heat to cure. Moreover, when the coating resin material is an actinic ray curable resin, it can be cured by applying an actinic ray such as ultraviolet rays from the energy applying unit 14. Moreover, when using the coating liquid which melt | dissolved resin with the solvent etc., a dry wind can be supplied from the energy provision part 14, and a coating film can be dried, and a sealing structure can be formed.
FIG. 4 shows an example in which a sealing structure is simultaneously applied to all surfaces of the upper surface end X, the lower surface end Y, and the side surface Z of the mirror panel unit U. In addition, when an L-shaped sealing structure is formed by applying it to a region including at least one of the lower surface end portion, one of the pair of outer rollers 12A shown in FIG. 4 and the inner roller 12B are used. May be formed.

  FIG. 5 shows an example of another method for simultaneously applying the coating resin material to the upper surface end portion, the lower surface end portion and the side surface portion of the mirror panel unit U.

  FIG. 5 shows an example in which an inkjet method or a spray method is used as a method for applying the coating resin material.

  The coating liquid 5A containing the coating resin material stored in the preparation kettle 16 is supplied to the ink jet head or the spray ejecting device as the coating device 15 via the pipe, and the upper end of the mirror panel unit U with a constant discharge amount. This is a method of forming the sealing structure 5 by simultaneously applying to the portion, the lower surface end portion and the side surface portion. Reference numeral 17 denotes a partition wall for preventing the coating liquid from flying outside the predetermined area.

  By the above method, the sealing structure integrated at the same time can be formed on the upper surface end, the lower surface end and the side surface of the mirror panel unit U.

〔Base material〕
The base material applicable to the solar reflective panel of the present invention is not particularly limited as long as it is a material that can hold the solar reflective layer 1 including a metal reflective layer and the like. There are no particular limitations on the type of the material, and it may be transparent or opaque. Examples of the transparent substrate preferably used include glass, quartz, and a transparent resin film. A particularly preferable substrate is a resin film capable of providing flexibility.

  As a resin film suitable as a substrate according to the present invention, various publicly known resin films can be used. For example, cellulose ester film, polyester film, polycarbonate film, polyarylate film, polysulfone (including polyethersulfone) film, polyethylene terephthalate, polyethylene naphthalate polyester film, polyethylene film, polypropylene film, cellophane, Cellulose diacetate film, cellulose triacetate film, cellulose acetate propionate film, cellulose acetate butyrate film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene vinyl alcohol film, syndiotactic polystyrene film, polycarbonate film, norbornene resin film , Polymethylpentenef Can Lum, polyether ketone film, polyether ketone imide film, a polyamide film, a fluororesin film, a nylon film, polymethyl methacrylate film, and acrylic films. Among these, a polycarbonate film, a polyester film, a norbornene resin film, and a cellulose ester film are preferable.

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

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

[Sunlight reflection layer 3]
The solar light reflection layer 3 according to the present invention includes a metal reflection layer 6 that serves as a mirror, and includes a functional layer having various characteristics.

(Metal reflective layer 6)
The metal reflective layer (also referred to as a reflective layer) according to the present invention is a reflective layer made of a metal having a function of reflecting sunlight. The surface reflectance of the reflective layer is preferably 80% or more, more preferably 90% or more. The metal reflective layer may be on the sunlight incident side (front side) or on the opposite side (back side), but it prevents the base material, especially the resin base material, from being deteriorated by sunlight. For this purpose, it is preferably arranged on the light incident side.

  The thickness of the metal reflective layer is preferably 10 to 200 nm, more preferably 30 to 150 nm, from the viewpoint of reflectivity and the like. It is preferable that the thickness of the reflective layer is larger than 10 nm because the film thickness is sufficient and does not transmit light, and a sufficient reflectance in the visible light region of the film mirror can be secured. Further, the reflectance increases in proportion to the film thickness up to about 200 nm, but it does not depend on the film thickness over 200 nm.

  The surface roughness Ra of the metal reflective layer is in the range of 0.01 to 0.1 μm, preferably in the range of 0.02 to 0.07 μm. Since the surface roughness Ra of the metal reflective layer is 0.01 μm or more, the film mirror surface also becomes rough due to the roughness, and the roll-to-roll method for continuously forming a film in the production stage of the film mirror is used. Even in such a case, sticking such as blocking in the reflective layer of the film mirror and the adjacent layer on the incident light side can be prevented. Further, when the surface becomes rough, the reflected light may be scattered. However, since the film mirror having the metal reflection layer has a concave shape, the film mirror should be used if the surface roughness Ra is 0.1 μm or less. Decreasing the reflection efficiency can be prevented by forming the concave shape.

  The metal reflective layer is formed as a material containing any element selected from the element group consisting of aluminum, silver, chromium, nickel, titanium, magnesium, rhodium, platinum, palladium, tin, gallium, indium, bismuth and gold. It is preferred that Among these, aluminum or silver is preferably the main component from the viewpoint of reflectance and corrosion resistance, and two or more such metal thin films may be formed. By doing so, the reflectance from the infrared region to the visible light region of the film mirror can be increased, and the dependency of the reflectance on the incident angle can be reduced. From the infrared region to the visible light region means a wavelength region of 2500 to 400 nm. The incident angle means an angle with respect to a line (normal line) perpendicular to the film surface. In particular, a silver reflection layer mainly composed of silver is preferable.

  As a method for forming the metal reflective layer according to the present invention, either a wet method or a dry method can be applied.

  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 a silver mirror reaction.

  On the other hand, the dry method is a general term for a vacuum film-forming method. Specific examples include a resistance heating vacuum deposition method, an electron beam heating vacuum deposition method, an ion plating method, and an ion beam assisted vacuum deposition method. And sputtering method. In particular, a vapor deposition method capable of a roll-to-roll method for continuously forming a film is preferably used. That is, in the present invention, it is preferable that the manufacturing method has an aspect including a step of forming a metal reflective layer, for example, a silver reflective layer by silver vapor deposition.

(Corrosion prevention layer 7)
The solar reflective layer according to the present invention is preferably provided with a corrosion preventive layer for the purpose of preventing corrosion of the metal reflective layer.

  The corrosion prevention layer is preferably provided adjacent to the metal reflection layer. In particular, it is preferable to provide a corrosion prevention layer when the metal reflective layer is a silver reflective layer. In particular, the corrosion prevention layer is more preferably adjacent to the light incident side of the metal reflection layer. Moreover, you may make a corrosion prevention layer adjoin on both sides of a metal reflective layer.

  The corrosion prevention layer contains a corrosion inhibitor. As the corrosion inhibitor, broadly, a corrosion inhibitor having an adsorptive group for metals, particularly silver, and a corrosion inhibitor having an antioxidant ability (also referred to as an antioxidant) are preferably used. The corrosion prevention layer preferably contains at least one of a corrosion inhibitor and an antioxidant having an adsorptive group for metals, particularly silver. Here, “corrosion” refers to a phenomenon in which a metal (silver) is chemically or electrochemically eroded or deteriorated by an environmental material surrounding it (see JIS Z0103-2004).

  Resin can be used for a corrosion prevention layer as a binder holding a corrosion inhibitor. For example, the following resins can be used. Cellulose ester, polyester, polycarbonate, polyarylate, polysulfone (including polyethersulfone), polyester such as polyethylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, cellophane, cellulose diacetate, cellulose triacetate, cellulose acetate pro Pionate, cellulose acetate butyrate, polyvinylidene chloride, polyvinyl alcohol, ethylene vinyl alcohol, syndiotactic polystyrene, polycarbonate, norbornene, polymethylpentene, polyetherketone, polyetherketoneimide, polyamide, fluororesin, nylon, Examples thereof include polymethyl methacrylate and acrylic resin. Of these, acrylic resins are preferred. The corrosion prevention layer preferably has a thickness of 30 nm or more and 1 μm or less.

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

  Next, details of the corrosion inhibitor will be described.

<Corrosion inhibitor>
Corrosion inhibitors having an adsorptive group for silver include amines and derivatives thereof, compounds having a pyrrole ring, compounds having a triazole ring, compounds having a pyrazole ring, compounds having a thiazole ring, compounds having an imidazole ring, 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.

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

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

  Examples of the compound having a triazole ring include 1,2,3-triazole, 1,2,4-triazole, 3-mercapto-1,2,4-triazole, 3-hydroxy-1,2,4-triazole, 3- Methyl-1,2,4-triazole, 1-methyl-1,2,4-triazole, 1-methyl-3-mercapto-1,2,4-triazole, 4-methyl-1,2,3-triazole, Benzotriazole, tolyltriazole, 1-hydroxybenzotriazole, 4,5,6,7-tetrahydrotriazole, 3-amino-1,2,4-triazole, 3-amino-5-methyl-1,2,4- Triazole, carboxybenzotriazole, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy 5'-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'-di-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-4-octoxyphenyl) benzo A triazole etc. or these mixtures are mentioned.

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

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

  Examples of the compound having an imidazole ring include imidazole, histidine, 2-heptadecylimidazole, 2-methylimidazole, 2-ethyl-4-methylimidazole, 2-phenylimidazole, 2-undecylimidazole, 1-benzyl-2-methyl. Imidazole, 2-phenyl-4-methylimidazole, 1-cyanoethyl-2-methylimidazole, 1-cyanoethyl-2-phenylimidazole, 1-cyanoethyl-2-ethyl-4-methylimidazole, 1-cyanoethyl-2-undecyl Imidazole, 2-phenyl-4-methyl-5-hydromethylimidazole, 2-phenyl-4,5 dihydroxymethylimidazole, 4-formylimidazole, 2-methyl-4-formylimidazole, 2-phenyl-4-phenyl Rumyl imidazole, 4-methyl-5-formyl imidazole, 2-ethyl-4-methyl-5-formyl imidazole, 2-phenyl-4-methyl-4-formyl imidazole, 2-mercaptobenzimidazole, etc., or these Of the mixture.

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

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

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

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

  Examples of the naphthalene type include thionalide.

(Adhesive layer 8)
The adhesive layer is not particularly limited as long as it has a function of improving the adhesion between the corrosion prevention layer 7 and the ultraviolet absorbing layer 9.

  The thickness of the adhesive layer is from 0.01 to 10 in terms of adhesion, smoothness, reflectance of the metal reflection layer, and the like. It is preferably in the range of μm, more preferably in the range of 0.1 to 6.0 μm.

  As long as the adhesive layer is formed of a resin, the resin material (binder) is not particularly limited as long as it satisfies the above conditions of adhesiveness and smoothness, polyester resin, acrylic resin, 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. As the method for forming this adhesive layer, conventionally known coating methods such as gravure coating, reverse coating, and die coating can be used.

  When the adhesive layer is a metal oxide, it can be formed by various vacuum film forming methods such as silicone oxide, aluminum oxide, silicone nitride, aluminum nitride, lanthanum oxide, and lanthanum nitride. This adhesive layer can be formed by, for example, resistance heating vacuum deposition, electron beam heating vacuum deposition, ion plating, ion beam assisted vacuum deposition, sputtering, or the like.

(UV absorbing layer 9)
The ultraviolet absorbing layer is a layer containing an ultraviolet absorber for the purpose of preventing deterioration of the sunlight reflecting mirror caused by sunlight or ultraviolet rays. The ultraviolet absorbing layer is preferably provided on the light incident side with respect to the base material, and as shown in FIG. 3, when the corrosion preventing layer is provided, it is preferably provided on the light incident side with respect to the corrosion preventing layer.

  Resin can be used for a ultraviolet absorption layer as a binder holding an ultraviolet absorber. For example, the following resins can be used. Cellulose ester, polyester, polycarbonate, polyarylate, polysulfone (including polyethersulfone), polyester such as polyethylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, cellophane, cellulose diacetate, cellulose triacetate, cellulose acetate pro Pionate, cellulose acetate butyrate, polyvinylidene chloride, polyvinyl alcohol, ethylene vinyl alcohol, syndiotactic polystyrene, polycarbonate, norbornene, polymethylpentene, polyetherketone, polyetherketoneimide, polyamide, fluororesin, nylon, Examples thereof include polymethyl methacrylate and acrylic resin. Among these, it is preferable to use an acrylic resin. In addition, it is preferable that the layer thickness of an ultraviolet absorption layer exists in the range of 1-200 micrometers.

  In addition to providing the ultraviolet absorbing layer 9 in the sunlight reflecting layer 3, an ultraviolet absorber is added to any one of the constituent layers provided on the light incident side of the base material 2, and also serves as the ultraviolet absorbing layer. You may do it. It is also preferable to add an ultraviolet absorber to the hard coat layer described later.

  Examples of UV absorbers include organic UV absorbers such as benzophenone, benzotriazole, phenyl salicylate, and triazine, and inorganic UV absorbers include titanium oxide, zinc oxide, cerium oxide, and iron oxide. Etc.

  Examples of benzophenone-based ultraviolet absorbers 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' -Tetrahydroxy-benzophenone and the like.

  Examples of the benzotriazole ultraviolet absorber include 2- (2′-hydroxy-5-methylphenyl) benzotriazole and 2- (2′-hydroxy-3 ′, 5′-di-t-butylphenyl) benzotriazole. 2- (2′-hydroxy-3′-t-butyl-5′-methylphenyl) benzotriazole and the like.

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

  Examples of triazine ultraviolet absorbers include 2,4-diphenyl-6- (2-hydroxy-4-methoxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy- 4-ethoxyphenyl) -1,3,5-triazine, 2,4-diphenyl- (2-hydroxy-4-propoxyphenyl) -1,3,5-triazine, 2,4-diphenyl- (2-hydroxy- 4-butoxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-butoxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- ( 2-hydroxy-4-hexyloxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-octyloxyphenyl) -1,3,5- Riazine, 2,4-diphenyl-6- (2-hydroxy-4-dodecyloxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-benzyloxyphenyl)- 1,3,5-triazine and the like can be mentioned.

  In addition to the above, as the ultraviolet absorber, a compound having a function of converting the energy held by ultraviolet rays into vibration energy in the molecule and releasing the vibration energy as heat energy can also be used. Furthermore, those that exhibit an effect when used in combination with an antioxidant or a colorant, or light stabilizers acting as a light energy conversion agent, called quenchers, 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.

  When a normal ultraviolet absorber is used, it is effective to use a photopolymerization initiator that generates radicals with visible light.

  The usage-amount of a ultraviolet absorber is 0.1-20 mass%, Preferably it is 1-15 mass%, More preferably, it exists in the range of 3-10 mass%. By making the amount used within these ranges, it is possible to improve the weather resistance while maintaining good adhesion to other constituent layers.

(Undercoat layer 10)
An undercoat layer is a layer which has resin and is provided in order to adhere | attach a base material and a metal reflective layer. Therefore, the undercoat layer is an adhesive that adheres the base material and the metal reflective layer, heat resistance that can withstand heat when the metal reflective layer is formed by a vacuum deposition method, etc., and a high reflection that the metal reflective layer originally has. Smoothness is required to bring out performance.

  The resin used for the undercoat layer is not particularly limited as long as it satisfies the above conditions of adhesion, heat resistance, and smoothness, polyester resin, acrylic resin, melamine resin, epoxy resin, Polyamide resin, vinyl chloride resin, vinyl chloride vinyl acetate copolymer resin, etc. can be used singly or as a mixed resin. From the viewpoint of weather resistance, polyester resin and melamine resin mixed resin or polyester resin and acrylic resin can be used. A mixed resin of a resin is preferable, and a thermosetting resin in which a curing agent such as isocyanate is further mixed is more preferable.

  The layer thickness of the undercoat layer is preferably in the range of 0.01 to 3.0 μm, more preferably in the range of 0.1 to 2.0 μm. By satisfying this layer thickness condition, for example, the unevenness on the surface of the resin film substrate can be concealed while maintaining adhesion, smoothness can be kept good, and the undercoat layer can be sufficiently cured. Therefore, as a result, the reflectance as a film mirror can be increased.

  The undercoat layer preferably contains a corrosion inhibitor used in the corrosion prevention layer.

  In addition, the formation method of an undercoat layer can use conventionally well-known coating methods, such as a gravure coat method, a reverse coat method, and a die coat method.

(Other component layers)
In addition to the functional layers described above, for example, a gas barrier layer, an antifouling layer, an antistatic layer, or the like may be provided.

  In the present invention, the gas barrier layer is for preventing deterioration of humidity, particularly deterioration of various functional elements protected by the resin base material and the resin base material due to high humidity. 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 above the metal reflective layer.

[Hard coat layer]
In the solar reflective panel of the present invention, a metalloxane skeleton having a metal-oxygen-metal bond as a skeleton is formed on the outermost surface layer of the film mirror for the purpose of preventing dirt and scratches on the surface of the film mirror installed outdoors. It is a preferable embodiment to provide a hard coat layer containing the polymer having the above. In particular, a polymer having a metalloxane skeleton exhibits an effect excellent in light resistance and weather resistance.

  In the conventional solar reflective panel, the adhesion between the constituent material of the hard coat layer and the sealing member may be low, and it is difficult to uniformly apply the sealing material.

  A polymer having a metalloxane skeleton by forming a sealing structure by applying a coating resin material to a region composed of the side surface portion Z of the mirror panel unit U and at least the upper surface end portion X as defined in the present invention. Even when a hard coat layer containing is used, a sealing structure can be uniformly formed in the end region.

  The hard coat layer containing a material having a metalloxane skeleton is represented by polymetalloxane such as silicon, titanium, zirconium, and aluminum, or polysilazane, perhydropolysilazane, alkoxysilane, alkylalkoxysilane, and the following general formula (1). It can be formed by applying and drying polysiloxane having a structure.

In formula, R <^11> , R < ¹² > may be same or different and represents a hydrogen atom, an alkyl group, or an aryl group. p is an integer of 1 or more.

  The hard coat layer according to the present invention is disposed on the outermost side on the light source side than the metal reflective layer, has a contact angle with water in the range of 80 to 170 °, and has a dynamic friction coefficient of 0.10 to 0.35. It is preferable to be within the range.

  By vapor deposition using a mixed gas of a fluorine compound and a silicon compound, or a compound containing fluorine and silicon, the surface energy can be lowered, and the contact angle of the hard coat layer with water can be within the range specified above.

  The outermost layer preferably has a dynamic friction coefficient in the range of 0.10 to 0.35, more preferably in the range of 0.15 to 0.25, in order to improve scratch resistance.

  By using polymethoxan such as silicon, titanium, zirconium and aluminum, polysilazane, perhydropolysilazane, alkoxysilane, alkylalkoxysilane, polysiloxane, etc., the dynamic friction coefficient between the film surfaces should be controlled within the range specified above. Can do.

The contact angle with respect to water can be measured by dropping 3 μl of water droplets on the surface of the mirror panel unit U in an environment of 23 ° C. and 55% RH using a contact angle CA-W manufactured by Kyowa Interface Science. The dynamic friction coefficient is determined by using a surface property measuring machine (HEIDON-14D) manufactured by Shinto Kagaku Co., with one mirror panel unit U attached to the sample table with the outermost layer facing up, and another one on the indenter. Are mounted so that the outermost surfaces of the two mirror panel units U are in contact with each other, and a load of about 160 g / cm ² is applied thereon and 10 times at a speed of 3 m / min. It can be reciprocated and calculated as an average dynamic friction coefficient of 10 reciprocations.

(Thickness of film mirror unit U)
The total thickness of the film mirror unit according to the present invention is preferably in the range of 75 to 250 μm, more preferably in the range of 90 to 230 μm, from the viewpoints of prevention of deflection of the mirror, regular reflectance, handling properties, and the like. More preferably, it exists in the range of 100-220 micrometers.

《Solar reflection panel》
The solar reflective panel of the present invention having the configuration shown in FIG. 1 can be preferably used for the purpose of collecting sunlight. As the solar reflective panel, an adhesive layer is preferably formed on the lowermost layer when viewed from the light incident side of the solar reflective panel, and the solar reflective surface is sealed on another base material, particularly on a metal base material. After affixing the panel, a sealing structure is given and used as a solar reflective panel.

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

<Adhesive layer>
The adhesive layer is not particularly limited, and for example, any of a dry laminating agent, a wet laminating agent, an adhesive, a heat seal agent, a hot melt agent, and the like is used.

  For example, polyester resin, urethane resin, polyvinyl acetate resin, acrylic resin, nitrile rubber and the like are used.

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

  The thickness of the pressure-sensitive adhesive layer is usually preferably in the range of 1 to 50 μm from the viewpoints of the pressure-sensitive adhesive effect, the drying speed, and the like.

<Metal base material>
Examples of the metal substrate that can be used when the solar reflective panel of the present invention is attached via an adhesive layer to form a solar reflective mirror include, for example, a steel plate, a copper plate, an aluminum plate, and an aluminum-plated steel plate. A metal material having high thermal conductivity such as an aluminum alloy plated steel plate, a copper plated steel plate, a tin plated steel plate, a chrome plated steel plate, or a stainless steel plate can be used.

  In the present invention, it is particularly preferable to use a plated steel plate, a stainless steel plate, an aluminum plate or the like having good corrosion resistance.

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

<< Production of solar reflective panel >>
[Preparation of solar reflective panel 1]
A biaxially stretched polyester film (polyethylene terephthalate film, thickness 100 μm) was used as the resin substrate. On one side of the polyethylene terephthalate film, (1) polyester resin (Polyester SP-181, manufactured by Nippon Synthetic Chemical), (2) melamine resin (manufactured by Super Becamine J-820 DIC), (3) TDI-based isocyanate (2 , 4-tolylene diisocyanate), (4) HDMI isocyanate (1,6-hexamethylene diisocyanate) at a resin solid content ratio of (1) :( 2) :( 3) :( 4) = 20: 1 A resin solution mixed in toluene so that the solid content concentration is 10% by mass under the condition of 1: 2 (mass ratio) is coated by a gravure coating method to form an adhesive layer having a thickness of 0.1 μm. Formed.

  Next, a silver reflective layer having a thickness of 80 nm was formed as a metal reflective layer on the formed adhesive layer by a vacuum deposition method. Next, on the silver reflective layer, the polyester resin and the TDI-based isocyanate were mixed at a resin solid content ratio of 10: 2, and coated by a gravure coating method to form an adjacent layer having a thickness of 0.1 μm. Furthermore, on the adjacent layer formed above, bar coating was performed using a 3% perhydropolysilazane liquid in dibutyl ether (NL120 manufactured by AZ Electric Materials Co., Ltd.) so that the film thickness after drying was 500 nm. After drying, it was annealed in an oven at 90 ° C. for 30 minutes to provide a hard coat layer. Further, a water-repellent agent (Aquanolan manufactured by AZ Electric Materials Co., Ltd.) was bar coated on the hard coat layer to form an antifouling layer, and a film laminate was produced.

  Subsequently, the produced film laminate was cut into a length of 100 mm and a width of 100 mm, and the thickness of the polyester film on the side opposite to the surface on which the metal reflective layer was formed was 0 .mu.m thick via an adhesive layer having a thickness of 3 .mu.m. The mirror film unit 1 was produced by pasting on an aluminum plate having a length of 5 mm and a length of 100 mm × width of 100 mm.

  Thereafter, using the end coating apparatus shown in FIG. 4, the silicon sealant (KE-4921-B manufactured by Shin-Etsu Silicone Co., Ltd.) is simultaneously applied to the upper surface end X, the lower surface end Y and the side surface Z of the mirror film unit 1. The solar reflective panel 1 was produced by providing a sealing structure. This method for forming the sealing structure is referred to as Method 1.

[Preparation of solar reflective panel 2]
In the production of the solar reflective panel 1, the same procedure except that an epoxy resin (2081D manufactured by Three Bond Co., Ltd.) was used instead of the silicon sealant (KE-4921-B manufactured by Shin-Etsu Silicone Co., Ltd.) as the forming material of the sealing structure. Thus, a solar reflective panel 2 was produced.

[Preparation of solar reflective panel 3]
In the production of the solar reflective panel 1, a urethane resin (HIBREN XL-6051A manufactured by MC Industrial Co., Ltd.) is used instead of the silicone sealant (KE-4921-B manufactured by Shin-Etsu Silicone Co., Ltd.) as the forming material of the sealing structure. A solar reflective panel 3 was produced in the same manner except that.

[Preparation of solar reflective panel 4]
In the production of the solar reflective panel 1, an acrylic resin (3017D manufactured by Three Bond Co., Ltd.) is used instead of the silicon sealant (KE-4921-B manufactured by Shin-Etsu Silicone Co., Ltd.) as a sealing structure forming material, and a high-pressure mercury lamp. A solar reflective panel 4 was produced in the same manner except that the film was cured at an irradiation distance of 15 cm and an integrated illuminance of 30 kJ / m ² .

[Preparation of solar reflective panel 5]
In the production of the solar reflective panel 1, a solar reflective panel 5 was produced in the same manner except that the hard coat layer and the antifouling layer were not formed.

[Preparation of solar reflective panel 6]
In the production of the solar reflective panel 1, the upper surface end X and the lower surface end Y of the mirror film unit 1 are used in place of the silicon sealant (KE-4921-B manufactured by Shin-Etsu Silicone) as the forming material of the sealing structure. The solar reflective panel 6 was produced in the same manner except that the aluminum foil tape (Teraoka No. 833 t0.13 width 12.7 mm) was sealed to the side surface Z. This method of forming the sealing structure is referred to as method 2.

[Preparation of solar reflective panel 7]
In the production of the solar reflective panel 1, after forming the side surface portion Z by the dip-type coating apparatus using a silicon sealant as a sealing material and forming a sealing structure on each side as shown in FIG. A solar reflective panel 7 was produced in the same manner except that the sealing structure was formed independently in the order of the end X and the lower end Y. This formation method of the sealing structure is referred to as method 3.

  Details of the sealing method described in Table 1 are as follows.

Method 1: Forming a sealing structure by simultaneously applying a coating resin material to the upper surface end X, lower surface end Y and side surface Z of the mirror film unit 1 (sealing structure forming method of the present invention)
Method 2: Form a sealing structure by sealing the upper surface end X, the lower surface end Y and the side surface Z of the mirror film unit 1 with an aluminum foil tape (sealing structure forming method of comparative example)
Method 3: After forming the side surface portion Z of the collar film unit 1, the sealing structure is formed independently in the order of the upper surface end portion X and the lower surface end portion Y (sealing structure forming method of the comparative example).
<< Evaluation of solar reflective panel >>
The following evaluation was performed about each produced said panel for sunlight reflection.

[Evaluation of corrosion resistance: salt water immersion test]
Each solar reflective panel produced as described above was curved at 1.7 mm / 100 mm using three rollers. Then, after immersing the curved solar reflective panel in 3.5% by weight salt water for 48 hours, the state of silver corrosion at the end of the metallic reflective layer of the solar reflective panel was visually observed, and was durable according to the following criteria: Sexuality was evaluated.

5: No change in color at the edge of the metal reflective layer is observed before and after immersion 4: Slight change in color at the edge of the metal reflective layer is observed before and after immersion, but the quality is satisfactory. : The color change at the edge of the metal reflective layer is slightly observed before and after immersion, but it is a quality acceptable for practical use. 2: The color change at the edge of the metal reflective layer is clearly different from that before immersion. This is a quality that is recognized and is a problem in practical use. 1: A sharp color change is observed at the end of the metal reflection layer compared to before immersion, and the quality is unbearable. [Evaluation of abrasion resistance: Steel wool test ]
After spraying 10 ml of pure water on the surface (hard coat layer forming surface side) of each of the solar reflective panels 1 to 5 produced above using a spray bottle, using # 0000 steel wool, 1000 g / cm After reciprocating friction 10 times with a friction load of ² , the surface was visually observed for the presence or absence of scratches, and the scratch resistance was evaluated according to the following criteria.

5: Scratches are not observed at all. 4: Slight scratches are observed. 3: Scratches are observed, but the quality is acceptable for practical use. 1 is a quality in which many scratches are generated and the quality is not practical. Table 1 shows the results obtained as described above.

  As is clear from the results shown in Table 1, the solar reflective panels 1 to 5 of the present invention are sealed with a configuration in which the entire upper surface end X, lower surface end Y and side surface Z are integrated. Therefore, it can be seen that it has excellent corrosion resistance. Among these, it can be seen that, particularly, the solar reflective panel 1 using a silicone resin as the sealing material has a practical strength, that is, a high corrosion resistance even after practically equivalent bending. On the other hand, in the solar reflective panel 6 which is a comparative example, corrosion presumed to be caused by fine tape peeling or gaps due to tape overlapping at the corners of the panel occurred due to concentration of stress accompanying bending. Moreover, the solar reflective panel 7 which is a comparative example is a level that causes a gap due to deterioration of the flatness of the end portion due to the formation of the sealing structure by multiple times of application, which is a practical problem. The corrosion resistance remained.

  Moreover, in the solar reflective panels 1-5 of this invention, it turns out that the solar reflective panels 1-4 which provided the hard-coat layer are exhibiting the outstanding abrasion resistance.

DESCRIPTION OF SYMBOLS 1 Panel for sunlight reflection 2 Base material 3 Sunlight reflection layer 4 Hard coat layer 5 Sealing member 5A Coating liquid containing covering resin material 6 Metal reflection layer 7 Corrosion prevention layer 8 Adhesion layer 9 UV absorption layer (UV absorption layer) )
DESCRIPTION OF SYMBOLS 10 Undercoat layer 11 Liquid receiving pan 12A Outer roller 12B Inner roller 13 Scraping blade 14 Energy application part 15 Spray-type coating device 16 Adjustment pot 17 Bulkhead U Mirror panel unit X Upper surface end Y Lower surface end Z Side part

Claims (3)

A solar reflective panel having a solar reflective layer including at least a metal reflective layer on a substrate,
A solar reflective panel, wherein a region including all side portions and at least one of an upper end portion and a lower end portion is covered with a continuous structure formed of a coating resin material.   The solar reflective panel according to claim 1, wherein the coating resin material is at least one resin selected from a silicone resin, a urethane resin, and an acrylic resin.   The solar reflective panel according to claim 1, wherein the solar reflective panel has a hard coat layer containing a polymer having a metalloxane skeleton on the outermost surface on the sunlight incident surface side.

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