JP2016089366A - Building laminate and daylighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a building laminate and a daylighting system, which have high light reflection, high light scattering properties, and high weather resistance.SOLUTION: A building laminate according to this invention comprises: a reflection base material with visible light reflectivity; and a light reflection layer and a light scattering layer that are laminated on one surface of the reflection base material. The light reflection layer is a layer having a particle size showing Mie scattering property and containing a metal oxide white pigment that can absorb ultraviolet light. The light scattering layer is a layer containing fine particles with the particle size showing geometric scattering property. The above purpose is achieved by providing the building laminate.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a building material laminate and a daylighting system having high light reflection performance, high light scattering performance, and high weather resistance.

  In recent years, as environmental problems such as global warming become more serious, the development of light control members that can adjust the absorption, polarization, reflection, transmission, etc. of external light has been promoted for the purpose of saving energy and reducing carbon dioxide. ing. For example, by using a light control member to increase the amount of light (light collection amount) that enters a room from a light source such as the sun through a window glass of a house, an automobile, etc., the room illuminance is improved without using illumination. Thus, power consumption can be reduced (see Patent Document 1).

  However, even if the light control member as described above is used for a window glass or the like to increase the amount of light collected, if the surface constituting the indoor space absorbs light, the light taken into the room is effectively used. It cannot be used. Therefore, it is desirable that the building material used for the ceiling surface and the wall surface forming the indoor space is one that reflects light.

  As a member having high light reflection performance, it is provided so as to cover the periphery of a so-called edge light type planar light source such as a backlight of a liquid crystal display device, and a reflection for efficiently making light from the light source incident on the light guide plate. There are members (see Patent Documents 2 and 3). However, since such a reflective member has a strong specular reflectivity (regular reflectivity), when used on a surface constituting an indoor space, the reflected light feels dazzling. Therefore, the above-described reflective member is used as a building material for interiors. Is not suitable. Moreover, when the light taken in from the outside is specularly reflected, the improvement of the illuminance in the indoor space is limited to a local one, and it is difficult to improve the illuminance of the entire indoor space uniformly.

  Furthermore, since the surface which comprises indoor space is exposed to the sunlight, indoor lighting, etc. which were taken in from the outside, it needs to have the tolerance to degradation by an ultraviolet-ray.

JP 2010-259406 A JP 2006-28489A JP-A-8-160208

  This invention is made | formed in view of the said situation, and it aims at providing the laminated body for building materials and lighting system which have high light reflection performance, high light scattering performance, and high weather resistance performance.

  In order to solve the above problems, the present invention includes a reflective base material having reflectivity for visible light, and a light reflection layer and a light scattering layer laminated on one surface of the reflective base material. A laminate for building materials, wherein the light reflecting layer is a layer having a particle diameter exhibiting Mie scattering and containing a metal oxide white pigment capable of absorbing ultraviolet rays, and the light scattering layer is There is provided a laminate for building materials, which is a layer containing fine particles having a particle size exhibiting geometric scattering properties.

  Since the laminate for building material of the present invention has a light reflecting layer that reflects visible light and a light scattering layer that scatters visible light, the reflectance is higher than that of the reflecting base material used as the base material. Can reflect visible light and scatter the reflected light. Moreover, since the metal oxide white pigment contained in the light reflection layer is capable of absorbing ultraviolet rays, it is possible to prevent deterioration of the reflective substrate and the like due to ultraviolet rays and to provide a highly weather-resistant laminate for building materials. be able to. By using such a building material laminate for a ceiling or the like of a building or the like, the illuminance of the entire indoor space can be improved more uniformly.

  In the said invention, it is preferable that the said reflection base material, the said light reflection layer, and the said light-scattering layer are laminated | stacked in this order. It is because the function of each layer can be exhibited more by laminating in the above order.

  In the present invention, the daylighting includes: a first light control member that reflects incident light in a predetermined direction; and a second light control member that diffuses light reflected by the first light control member. In the system, the second light control member includes a reflective base material having reflectivity for visible light, a light reflective layer and a light scattering layer laminated on one surface of the reflective base material, The light reflecting layer is a layer containing a metal oxide white pigment having a particle diameter exhibiting Mie scattering properties and capable of absorbing ultraviolet rays, and the light scattering layer has a geometric scattering property. A daylighting system is provided that is a layer containing fine particles having a particle size shown.

  According to the present invention, by using both the first light control member and the second light control member, it is possible to efficiently and widely guide light taken from the outside. The illuminance of the entire space can be improved more efficiently and more uniformly.

  The laminate for building materials of the present invention has an effect of being excellent in high light reflection performance, high light scattering performance, and high weather resistance performance.

It is a schematic sectional drawing which shows an example of the laminated body for building materials of this invention. It is a schematic sectional drawing which shows the other example of the laminated body for building materials of this invention. It is explanatory drawing which shows an example of schematic structure of the lighting system of this invention. It is a schematic perspective view which shows an example of the 1st light control member in this invention. It is explanatory drawing for demonstrating the transmission path | route of the light in the 1st light control member in this invention. It is a schematic sectional drawing which shows the other example of the 1st light control member in this invention.

  Hereinafter, the building material laminate and the daylighting system of the present invention will be described.

A. Laminate for building material The laminate for building material of the present invention comprises a reflective base material having reflectivity for visible light, and a light reflecting layer and a light scattering layer laminated on one surface of the reflective base material. A laminate for building materials, wherein the light reflecting layer is a layer having a particle diameter exhibiting Mie scattering and containing a metal oxide white pigment capable of absorbing ultraviolet rays, and the light scattering layer is And a layer containing fine particles having a particle size exhibiting geometric scattering properties (hereinafter sometimes referred to as “geometric scattering fine particles”).

  The building material laminate of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of a laminate for building materials according to the present invention. The building material laminate 10 of the present invention has a reflective substrate 1, a light reflecting layer 3 containing a metal oxide white pigment 2, and a light scattering layer 5 containing geometrically scattering fine particles 4. In the example of FIG. 1, a base material having a plurality of gaps 6 is used as the reflective base material 1.

  Since the laminate for building material of the present invention has a light reflecting layer that reflects visible light and a light scattering layer that scatters visible light, the reflectance is higher than that of the reflecting base material used as the base material. Can reflect visible light and scatter the reflected light. Moreover, since the metal oxide white pigment contained in the light reflection layer is capable of absorbing ultraviolet rays, it is possible to prevent deterioration of the reflective substrate and the like due to ultraviolet rays and to provide a highly weather-resistant laminate for building materials. be able to. By using such a laminate for building materials for a ceiling or the like of a building or the like, the illuminance of the entire indoor space can be improved efficiently and more uniformly.

In the building material laminate of the present invention, the stacking order of the light reflecting layer and the light scattering layer is not particularly limited, and the reflecting base material, the light reflecting layer, and the light scattering layer are in this order. Even if it is laminated | stacked, the reflection base material, the light-scattering layer, and the light reflection layer may be laminated | stacked in this order. In the present invention, it is particularly preferable that the reflective base material, the light reflecting layer, and the light scattering layer are laminated in this order. Depending on the amount of the metal oxide white pigment contained in the light reflection layer, if the light reflection layer is placed closer to the light source than the light scattering layer, the incident light is reflected by the light reflection layer and light scattering. Since less light reaches the layer, the light scattering effect by the light scattering layer may not be sufficiently obtained. Therefore, it is considered that the function of each layer can be exhibited to the maximum by laminating the reflective base material, the light reflective layer, and the light scattering layer in this order.
Hereinafter, each structure of the laminated body for building materials of this invention is demonstrated.

1. Reflective base material The reflective base material used as the base material in the building material laminate of the present invention has reflectivity with respect to visible light. In the present invention, “visible light” means light having a wavelength in the range of 380 nm to 780 nm, and “having reflectivity with respect to visible light” means, for example, 90% or more, It means having a visible light reflectance of 95% or more. The visible light reflectance is an average reflectance for each wavelength in the visible light wavelength region with respect to a standard white plate measured by an ultraviolet-visible spectrophotometer (manufactured by Shimadzu Corporation, UV-3100PC). Further, in the present invention, when it is simply “visible light reflectance”, it means a value obtained by measuring the total reflectance obtained by combining the regular reflectance and the diffuse reflectance, and will be described later as “regular reflectance”. Shall be distinguished. The same applies to the visible light reflectance of each member of the building material laminate and the daylighting system of the present invention described below.

  From the viewpoint of visible light reflectance and regular reflectance, the reflective substrate is preferably white. The reflective base material preferably has a higher visible light reflectance, but if the regular reflectance is high, the reflected light from the laminate for building materials may be dazzled even if it has a light scattering layer described later. There is sex. Therefore, the reflective base material preferably has a regular reflectance of 5% or less, particularly 2% or less when the incident angle and the outgoing angle are 60 °. This is because the specular reflectivity of the reflective substrate can be eliminated by setting the regular reflectance within the above range. The above-mentioned “regular reflectance” means that an absolute reflectance measuring unit (JAMN Corp., ARMN-735) is attached to an ultraviolet-visible near infrared spectrophotometer (JASCO Corp., V-760). , Measured for a predetermined incident angle and outgoing angle, and is an average reflectance for each wavelength in the visible light wavelength region. The same applies to the regular reflectance of each member of the building material laminate and the daylighting system of the present invention described below.

  Examples of the white reflective base material as described above include those that exhibit a white color by having a plurality of voids in the reflective base material, and white particles such as white pigments inside the reflective base material. Thus, a white color can be used. Specifically, a resin layer containing a plurality of voids or a resin layer containing white particles can be used. Especially, in this invention, it is preferable that a reflective base material is a resin layer which includes several space | gap. This is because a high reflectance can be realized by adjusting the difference in refractive index between the resin to be used and the gap, and since the gap has an extremely low light absorption rate, the light can be used effectively.

  The resin material constituting the resin layer enclosing the plurality of voids is not particularly limited, and general resins such as polyethylene terephthalate (PET), polyethylene, polypropylene, vinyl chloride, polycarbonate, and acrylic may be used. Among them, polyethylene terephthalate is preferably used.

  The reflective base material, which is a resin layer containing the plurality of voids, can be obtained by, for example, stretching a PET resin in a biaxial direction after film formation to orient the molecules and crystallize them. By stretching in the biaxial direction, the strength and heat resistance can be improved, and voids are formed around the polymer particles during stretching, and the voids exhibit a scattering effect on light, so that whitening occurs. Thus, a high reflectance can be obtained. Specific examples of such a white biaxially stretched PET film include E80 or E6SR manufactured by Toray Industries, Inc.

  A reflection member provided so as to cover the periphery of a so-called edge-light type planar light source such as a backlight of a liquid crystal display device, and to efficiently make light from the light source incident on the light guide plate is made of metal. Although there is a white thing, you may use the white thing among the said reflection members as a reflective base material in this invention. The material and manufacturing method of such a white reflective member are disclosed in detail in International Publication No. 2009/041448 and Japanese Patent Laid-Open No. 63-161029.

2. Light Reflecting Layer The light reflecting layer in the present invention is a layer containing a metal oxide white pigment that has a particle size exhibiting Mie scattering properties and can absorb ultraviolet rays. Since the said metal oxide white pigment can absorb an ultraviolet-ray, deterioration by the ultraviolet-ray of the laminated body for building materials can be prevented, and it can be set as the laminated body for building materials which has high weather resistance performance. Further, since the metal oxide white pigment has Mie scattering properties, it can reflect visible light at a high reflectance, and the building material has a visible light reflectance higher than the visible light reflectance of the reflective substrate. It can be set as a laminated body.

  In the present invention, the metal oxide white pigment “having a particle size exhibiting Mie scattering” means that the average particle size of the metal oxide white pigment is such that visible light is Mie scattered. Shall. Specifically, the average particle diameter of the metal oxide white pigment is in the range of 200 nm to 400 nm. This is because, if the average particle diameter is within the above range, visible light can be reflected uniformly with high reflectance. When the average particle size is outside the above range, visible light is not reflected uniformly, the building material laminate is tinted (does not look white), and the metal oxide white pigment particles are transparent to visible light. And the target reflectance may not be improved.

  In addition, the average particle diameter of the metal oxide white pigment is measured by an electron microscope, and the same applies to the average particle diameter in each member of the building material laminate and the daylighting system of the present invention described below.

  The metal oxide white pigment contained in the light reflecting layer is not particularly limited as long as it is a white metal oxide pigment capable of absorbing ultraviolet rays. For example, titanium oxide or zinc oxide can be used, and titanium oxide is preferably used. Titanium oxide has different properties depending on its crystal structure, but the metal oxide white pigment is preferably a rutile type titanium oxide having low activity as a catalyst and excellent thermal stability.

  For the light reflection layer, the above-mentioned metal oxide white pigment is dispersed in a resin material, and coating methods such as bar coating method, roll coating method, spray coating method, dip coating method, silk screen printing, offset printing, gravure printing It can be obtained by forming a film by a whole surface printing method such as by a molding method, a molding method such as an extrusion method, and drying and curing.

  The resin material in which the metal oxide white pigment is dispersed is not particularly limited, and a commonly used resin material can be used. From the standpoint of preventing yellowing and the like, the light reflecting layer preferably does not contain a photopolymerization initiator. Therefore, as the resin material, an electron beam curable resin or a thermosetting resin is preferably used. The electron beam curable resin is formed using, for example, a polymerizable monomer, a polymerizable oligomer, or a prepolymer as appropriate. For example, a polyfunctional acrylate is used as the polymerizable monomer. Examples of the polymerizable oligomer include epoxy acrylate, urethane acrylate, polyester acrylate, and polyether acrylate. Moreover, as a dilution solvent, for example, ethyl acetate is used. Moreover, as a thermosetting resin, a urethane resin, an epoxy resin, etc. can be mentioned, for example.

  The ratio of the metal oxide white pigment and the resin material in the ink composition for forming the light reflection layer is in the range of 1 to 5, particularly 3 to 5 in terms of P / V ratio. Is preferred. If the P / V ratio is less than the above range, when the light reflecting layer is viewed in plan, the occurrence rate of the place where the metal oxide white pigment is not disposed (pinhole) increases, and the lower layer is not absorbed by ultraviolet rays. The weather resistance of the building material laminate may be reduced. If the P / V ratio exceeds the above range, it may be difficult to disperse the metal oxide white pigment in the ink composition, and the adhesion to the substrate may be reduced.

  Here, the P / V ratio means the weight ratio of the pigment content (P: pigment) to the solid content (V: vehicle) other than the pigment in the ink composition. The same applies to each member of the building material laminate and the daylighting system of the present invention described below.

The coating amount of the ink composition for forming a light reflecting layer when forming the light reflecting layer is not particularly limited as long as it can form a layer having desired light reflecting performance and weather resistance performance. / ^m 2 to 10 g / ^m in the range of ^2, preferably in the range of ^{2g / m 2 ~5g / m 2} . If the coating amount is less than the above range, it may not be possible to obtain a light reflecting layer having desired light reflecting performance and weather resistance performance, and the coating amount of the light reflecting layer forming ink composition exceeding the above range is applied. This is because the obtained light reflection performance and weather resistance performance may not be improved.

  In addition to the metal oxide white pigment and resin, the light reflecting layer forming ink composition is provided with an antioxidant, a crosslinking agent, a hard coat agent, a scratch-resistant filler, a polymerization inhibitor, an antistatic agent, a leveling agent, and a thixotropic property. An optional additive such as an agent, a coupling agent, a plasticizer, an antifoaming agent, and a filler may be contained.

3. Light Scattering Layer The light scattering layer in the present invention is a layer containing geometrically scattering fine particles. Since the geometrically scattering fine particles scatter visible light, regular reflectance can be reduced. Therefore, the light reflected by the building material laminate having such a light scattering layer is rarely felt dazzling, and the light incident on such a building material laminate is scattered and reflected over a wide range. The illuminance of the space can be improved uniformly throughout.

  In the present invention, the fine particle having a particle diameter exhibiting geometric scattering property means that the average particle diameter of the fine particle is such that visible light is reflected and scattered geometrically, that is, the wavelength of visible light. Is meant to be sufficiently larger than Specifically, the average particle diameter of the geometrically scattering fine particles is in the range of 1 μm to 20 μm, in particular in the range of 2 μm to 10 μm, particularly in the range of 2 μm to 5 μm. This is because if the average particle diameter is out of the above range, the dispersibility and coating properties of the geometrically scattering fine particles are lowered, and it may be difficult to produce the light scattering layer. In addition, since the measuring method of the average particle diameter of geometric scattering fine particles is the same as that of the metal oxide white pigment mentioned above, description here is abbreviate | omitted.

  The geometrically scattering fine particles contained in the light scattering layer are not particularly limited as long as they do not absorb light, and transparent fine particles are preferably used. As the transparent fine particles, inorganic or organic particles can be used. In the present invention, from the viewpoint of versatility, inorganic ones are preferable, and fine particles such as silicon oxide are suitably used. Such fine particles may be hollow or solid.

  The light scattering layer can be obtained by dispersing geometrically scattering fine particles in a resin material, forming a film by the same method as the above-described light reflecting layer, drying, curing, and the like. Further, the resin material in which the geometrically scattering fine particles are dispersed is the same as that of “2. Light reflecting layer”, and thus the description thereof is omitted here.

  By using a resin having a refractive index different from that of the geometric scattering fine particles, the traveling direction of the light reflected by the reflective base material or the light reflecting layer can be changed at the interface between the geometric scattering fine particles and the resin. It is possible to widen the diffusion angle of the light emitted from the building material laminate. Further, in the light scattering layer, the geometric scattering fine particles are completely buried in the layer, and the surface may be smooth, and some of the geometric scattering fine particles protrude from the surface of the light scattering layer. The surface of the light scattering layer may have irregularities due to the contour shape of the geometrically scattering fine particles.

  The ratio of the geometrically scattering fine particles in the light scattering layer forming ink composition for forming the light scattering layer to the resin material is in the range of 0.05 to 0.5 in terms of P / V ratio, and in particular, the ratio is 0.8. It is preferable to be within the range of 1 to 0.3. If the P / V ratio is less than the above range, the desired light diffusion performance may not be obtained. If the P / V ratio exceeds the above range, it is difficult to disperse the geometrically scattering fine particles in the light scattering layer forming ink composition, and the adhesion to the substrate may be lowered. There is sex.

The coating amount of the light scattering layer forming ink composition when forming the light scattering layer is not particularly limited as long as it can form a layer having a desired light scattering performance. For example, 1 g / m ^2. in the range of to 20 g / ^{m 2,} preferably be within the range of ^{2g / m 2 ~10g / m 2} . If the coating amount is less than the above range, it may not be possible to obtain a light scattering layer having a desired light scattering performance. Even if a coating amount exceeding the above range is applied, the light scattering layer forming ink composition may be applied. This is because the obtained light scattering performance may not be improved.

  In addition to the geometrically scattering fine particles and the resin, the ink composition for forming the light scattering layer includes a weather resistance improver such as an ultraviolet absorber and a light stabilizer, an antioxidant, a cross-linking agent, a hard coat agent, a scratch-resistant filler, and a polymerization agent. An optional additive such as an inhibitor, an antistatic agent, a leveling agent, a thixotropic agent, a coupling agent, a plasticizer, an antifoaming agent, or a filler may be contained.

4). Arbitrary member The laminated body for building materials of this invention may have arbitrary members other than the reflective base material mentioned above, a light reflection layer, and a light-scattering layer. For example, as illustrated in FIG. 2, in the building material laminate 10, the reflective substrate 1 may be bonded to a gypsum board 8 or the like via an adhesive layer 7. By using the gypsum board having the above layers as the interior material of the ceiling surface, the illuminance of the entire indoor space can be improved more efficiently and more uniformly. FIG. 2 is a schematic cross-sectional view showing another example of the building material laminate of the present invention. The reference numerals not described in FIG. 2 are the same as those described in FIG.
Hereinafter, arbitrary members used in the present invention will be described.

(1) Adhesive layer The laminate for building materials of the present invention may have an adhesive layer for bonding the laminate for building materials to a wall surface or a ceiling surface constituting an indoor space such as a building. Although it does not specifically limit as an adhesive layer, For example, what uses rubber-type, an acrylic type, an olefin type, a polyester-type, a polyurethane-type adhesive, etc. as an adhesive main ingredient is mentioned. Examples of such an adhesive layer include a pressure-sensitive adhesive layer.

(2) Underlayer The reflective substrate in the building material laminate may be bonded to a gypsum board or the like via an adhesive layer. By using the gypsum board having the above layers as the interior material of the ceiling surface, the illuminance of the entire indoor space can be improved more efficiently and more uniformly. Further, various underlayers used for a decorative board or the like can be used instead of the gypsum board. Further, it may be pasted with wallpaper backing paper and an adhesive, and pasted with gypsum board with wallpaper paste such as starch paste.

(3) Color / pattern layer The laminate for building materials of the present invention may have a layer having a color, a pattern, a pattern or the like between the above-described layers. At this time, the color / pattern layer is disposed on the entire surface of the building material laminate in plan view, and the visible light reflectivity as a whole of the building material laminate decreases when the area exhibiting white color decreases, The color / pattern layer is preferably formed only in a partial region in a plan view of the building material laminate. The position where such a color / pattern layer is arranged is not particularly limited, but from the viewpoint of visibility, a reflective base material, a light reflective layer, and a light scattering layer are laminated in this order. In the building material laminate, it is preferably disposed between the light reflecting layer and the light scattering layer.

5). Building Material Laminate The application of the building material laminate of the present invention is not particularly limited, and can be used as a building material in places where high light reflection performance, high light scattering performance, and high weather resistance are desired. For example, the laminate for building materials can be used as an interior material, and may be disposed on a ceiling surface or a wall surface constituting an indoor space. The building material laminate of the present invention may not be disposed on the entire surface of the ceiling surface or the wall surface, but if the arrangement area is increased, a higher illuminance improvement effect can be obtained.

  The building material laminate of the present invention diffuses and reflects external light taken from the opening of a building such as a window to the entire indoor space, but also diffuses and reflects light from indoor light sources such as illumination light. Therefore, it can be suitably used as an interior material of a building that has no or few openings for taking in external light, such as a basement or a warehouse.

  Such a building material laminate preferably has a visible light reflectance of 95% or more, particularly 97% or more, particularly 99% or more as a whole building material laminate, and an incident angle and an emission angle of 20%. It is preferable that the regular reflectance at 60 ° to 60 ° is 2% or less, particularly 1.5% or less, particularly 1% or less. When the building material laminate has visible light reflectance and regular reflectance in the above-described ranges, the illuminance of the entire indoor space can be improved efficiently and uniformly.

B. Daylighting system Next, the daylighting system of the present invention will be described.
The daylighting system of the present invention includes a first light control member that reflects incident light in a predetermined direction, and a second light control member that diffuses light reflected by the first light control member. In the system, the second light control member includes a reflective base material having reflectivity for visible light, a light reflective layer and a light scattering layer laminated on one surface of the reflective base material, The light reflecting layer is a layer containing a metal oxide white pigment having a particle diameter exhibiting Mie scattering properties and capable of absorbing ultraviolet rays, and the light scattering layer has a geometric scattering property. It is a layer containing fine particles having the particle diameter shown.

  The daylighting system of the present invention will be described with reference to the drawings. FIG. 3 is an explanatory diagram showing an example of a schematic configuration of the daylighting system of the present invention. The daylighting system 20 of the present invention includes a first light control member 30 that reflects the incident light L in a predetermined direction, and a second light control member that diffusely reflects the light reflected by the first light control member 30. 10 and. In the example of FIG. 3, the first light control member 30 is disposed on the indoor space 23 side of the window 22, which is an opening of the building 21, where the incident light L is incident, and the second light control member 10. Are arranged on the outermost surface (the indoor space 23 side) of the ceiling surface 24 constituting the indoor space 23. Incident light L incident from the window 22 is reflected in the direction of the ceiling surface 24 by the first light control member 30, and reflected light from the first light control member 30 incident on the second light control member 10 is It is diffusely reflected and spreads throughout the indoor space 23.

In the daylighting system of the present invention, by using both the first light control member and the second light control member, it is possible to efficiently and widely guide light taken from outside. The illuminance of the entire indoor space can be improved efficiently and more uniformly.
Hereinafter, the first light control member and the second light control member in the daylighting system of the present invention will be described.

1. First light control member The first light control member in the daylighting system of the present invention reflects incident light in a predetermined direction. The structure of the first light control member is not particularly limited as long as a desired function can be obtained. Examples of a structure capable of obtaining a function of reflecting incident light in a predetermined direction include a louver type and a prism type light control member. Among them, a louver type light control member is preferable. This is because the reflection direction can be adjusted according to the incident angle of the incident light.
Hereinafter, the description will be divided into a louver-type light control member and other light control members.

(1) Louver-type light control member The structure of the louver-type light control member is not particularly limited. For example, the light transmitting portion having a plurality of grooves on one surface and the light control formed in the groove. It can have a part. Such a louvered light control member will be described with reference to the drawings. FIG. 4 is a schematic perspective view showing an example of a louvered light control member. As shown in FIG. 4, the louver-type light control member 30 </ b> A has a plurality of groove portions 32 formed linearly and in parallel in the light transmission portion 31, and has a light control portion 33 in the groove portion 32.

  In such a louver-type light control member, for example, the light control unit is made of a resin material having a lower refractive index than the light transmission unit, so that the refractive index of the light transmission unit and the light control unit is reduced. It is possible to cause total reflection of light due to the difference and increase the amount of light collection using the reflected light.

  FIG. 5 is an explanatory diagram for explaining a light transmission path in a louver-type light control member having a light control unit made of a resin material having a lower refractive index than the light transmission unit. Reference numerals not described in FIG. 5 are the same as those described in FIG. 3 or FIG. In the example shown in FIG. 5, an adhesive layer 51 is provided on the light transmitting portion 31 (on the light control portion 33 side) of the louver type light control member 30 </ b> A, and the light transmitting portion 31 is interposed via the adhesive layer 51. And pasted on the window 22. Incident light L incident from the window 22 is reflected upward in the figure at the interface between the light transmission part 31 and the light control part 33 in the louver-type light control member 30A.

By using such a louver-type light control member in a building or the like, the light taken from the outside can be guided not to the floor of the building but to the ceiling surface. In addition, sufficient illuminance in the room can be secured.
Hereinafter, each structure of the louver type light control member will be described.

(A) Light transmission part The light transmission part in this invention has a some groove part in one surface. The material constituting such a light transmitting portion is not particularly limited as long as it is a material having high light transmittance, and examples thereof include thermosetting resins and ionizing radiation curable resins. Among these, ionizing radiation curable resins are preferred from the viewpoint of curability. Examples of the ionizing radiation curable resin include an ultraviolet curable resin, an electron beam curable resin, a visible light curable resin, a near-infrared curable resin, and the like. Among these, ultraviolet rays are used from the viewpoint of versatility, curability, and light transmittance. A curable resin and an electron beam curable resin are preferred. When using an ionizing radiation curable resin as the material of the light transmission part, it is preferable that a photopolymerization initiator is included.

  In addition to the above resins, the light transmitting part is a weather resistance improver such as an ultraviolet absorber, a light stabilizer, an antioxidant, a crosslinking agent, a hard coat agent, a scratch-resistant filler, a polymerization inhibitor, an antistatic agent, a leveling agent, a thixotrope. You may contain additives, such as a property imparting agent, a coupling agent, a plasticizer, an antifoamer, and a filler.

  The refractive index of the light transmission part is appropriately selected according to the refractive index of the light control part, etc., for example, within the range of 1.40 to 1.80, especially within the range of 1.45 to 1.70, especially It is preferable to be within the range of 1.50 to 1.65. The refractive index of the light transmission part is measured at a wavelength of 589 nm under the condition of a temperature of 23 ° C. using an Abbe refractometer (manufactured by Atago Co., Ltd.) according to the refractive index measurement method defined in JIS K7142. Measured using a sodium light source. In the following description, the refractive index measurement method is measured by this method.

Further, the visible light transmittance of the light transmitting portion is preferably 70% or more, more preferably 80% or more, and particularly preferably 90% or more. When the light transmission part has the visible light transmittance described above, a decrease in the amount of light emitted to the indoor side due to absorption of incident light in the light transmission part is suppressed, and the visibility of the louver-type light control member can be improved. .
The visible light transmittance was measured using a spectrophotometer (“UV-2450” manufactured by Shimadzu Corporation, JIS K 0115 compliant product), PET film manufactured by Toyobo (product number: Cosmo Shine A4300, film thickness: 100 μm). ) It is confirmed by measuring within a measurement wavelength range of 380 nm to 780 nm with respect to the light transmission part having a film thickness of 10 μm formed thereon.

(B) Groove part As a longitudinal cross-sectional shape of the groove part, at least one of two side surfaces constituting a triangle, a square, a rectangle, a trapezoidal shape, and a longitudinal cross-sectional shape is a taper constituted by two or more straight lines or curved lines. Examples thereof include a shape and a shape whose four sides are curved. Moreover, the corner | angular part of a groove part may have a curved surface, and also the side of the side surface which comprises the said longitudinal cross-sectional shape may be a straight line, and may be a curve.

  The shape of the groove portion in plan view is not particularly limited, and may be, for example, a linear shape or a curved shape. Furthermore, the arrangement of the groove portions in plan view may be arranged in parallel, may be arranged in parallel, or may be arranged randomly in the other direction. In particular, as shown in FIG. 4, it is preferable that the groove portions 32 are arranged in parallel in a straight line in a plan view. The dimensions and the like of the groove are not particularly limited, and can be appropriately set according to the function desired for the first light control member.

(C) Light control part A light control part is formed in the groove part of a light transmissive part. That is, the light control part and the groove part usually have the same shape. The light control part is not particularly limited as long as it has a refractive index lower than that of the light transmission part, and may be a resin layer in which the groove part is filled with a resin or an air layer. Since the refractive index of air is usually about 1.0 and is lower than the refractive index of the resin normally used for the above-described light transmission part, the interface between the light transmission part and the light deflection part (that is, the side surface of the groove part) is different. Refractive index interface.

  When the light control unit is a resin layer, the resin layer is made of a resin material having a lower refractive index than the light transmission unit. As a result, total reflection of light due to the difference in refractive index can be caused at the interface between the light transmission unit and the light control unit, and the amount of light collected using the reflected light can be increased. The material of the resin layer may be a transparent resin having a refractive index lower than that of the light transmitting portion, and is preferably an ionizing radiation curable resin. Since additives such as an ionizing radiation curable resin and a photopolymerization initiator that can be used in the light control unit are the same as those in “(a) Light transmission unit”, description thereof is omitted here.

  The refractive index of the resin layer may be lower than the refractive index of the light transmission portion, and is preferably in the range of 1.40 to 1.55, for example. The resin layer preferably has a desired visible light transmittance. Specifically, since it is the same as the visible light transmittance of the light transmitting portion described above, description thereof is omitted here.

  Regardless of whether the light control unit is a resin layer or an air layer, the cross-sectional shape and dimensions of the light control unit are the same as those described in “(b) Groove”. Description of is omitted. In the present invention, the reflection angle of the light incident on the first light control member can be adjusted by adjusting the cross-sectional shape (shape of the groove) of the light control unit.

(D) Louver type light control member The surface including the light control part of the louver type light control member may have a flattening layer, a scattering layer, and the like. This is because the occurrence of the light diffraction phenomenon and interference phenomenon can be suppressed, and the deterioration of the visibility of the optical member due to the appearance of multiple images can be prevented. Moreover, you may have a photocatalyst layer for the purpose of air quality control.

(E) Manufacturing method of louver-type light control member As a manufacturing method of louver-type light control member, a light transmitting portion having a plurality of groove portions of a desired shape is formed on the surface, and a light control portion is formed in the groove portion. If it is a method which can be performed, it will not specifically limit. The method for forming the light transmissive part is not particularly limited. For example, after the composition for forming the light transmissive part including the material for the light transmissive part is applied on the substrate, the shaping plate having the convex part is formed. It can be formed by crosslinking and curing in the pressed state. The shaped plate used at this time has a plurality of convex portions on the surface, and the inverted shape and the size of the convex portions usually correspond to the shape and size of the groove portion. The method for forming the light control unit is not particularly limited. For example, a method for applying a light control unit forming composition containing a material for the light control unit, filling the groove of the light transmission unit, and curing it. Can be used.

(2) Other light control member As the other light control member, for example, a prism type light control member or the like can be used. The prism-type light control member has a function of polarizing and reflecting incident light and controlling the incident direction of the light to the indoor side. For example, as shown in FIG. 6, the prism-type light control member 30B has a structure including a plurality of unit prisms 61 having a trapezoidal cross section. By generating polarized light, the incident direction when incident light enters the room can be controlled. Note that the space between adjacent unit prisms (portion indicated by 62 in FIG. 6) may be filled with air, or may be filled with a material having a bending rate different from that of the unit prism.

  The details of the structure of the unit prism and the like can be the same as the details of the unit prism described in, for example, Japanese Patent Application Laid-Open No. 2013-15569.

(3) Arbitrary member In this invention, the 1st light control member may have arbitrary members other than the light transmission part and light deflection | deviation part which were mentioned above. For example, the first light control member may have a base material such as glass or a resin film in order to increase mechanical strength, and the first light control member may be a desired member such as a window glass. You may have the adhesion layer for pasting together. Furthermore, you may have the overcoat layer aiming at preventing the adhesion component of the said adhesion layer transferring to a light transmissive part or a light deflection | deviation part. In addition, the first light control member may have a hard coat layer for the purpose of improving weather resistance and scratch resistance. As these members, those used for ordinary optical members can be appropriately selected and used within the intended range.

(4) Method of using first light control member The first light control member as described above can be used in various forms. For example, the first light control member may be in the form of a film or a film having an adhesive layer. By sticking such a film-like first light control member to a building or a vehicle window from the inside, the light taken in from the outside can be controlled.

  Moreover, a 1st light-control member can be used as a roll screen by arrange | positioning through the adhesion layer on one surface of a screen base material, and setting it as a screen. Furthermore, the elongate strip | belt-shaped board (slat) which comprises a blind can be used as a blind by setting it as the 1st light control member formed on the base material. In addition, the first light control member can be used as a screen door by forming the first light control member in a film shape and providing a plurality of pores in the first light control member formed in the film shape. By constituting a part or all of the plate-like member constituting the first light control member, it can also be used as a door.

2. 2nd light control member The 2nd light control member in the lighting system of this invention is a reflective base material which has reflectivity with respect to visible light, and the light reflection layer laminated | stacked on one surface of the said reflective base material And the light scattering layer, and the light reflection layer is a layer having a particle diameter exhibiting Mie scattering properties and containing a metal oxide white pigment capable of absorbing ultraviolet rays, and the light scattering layer. Is a layer containing fine particles having a particle size showing geometric scattering. Such a second light control member diffuses the light reflected by the first light control member.

  Since the second light control member in the daylighting system of the present invention can be the same as “A. Building material laminate”, description in this section is omitted.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
[Example 1-1]
(Formation of light reflection layer)
An ink composition for forming a light reflection layer was prepared in which a metal oxide white pigment (titanium oxide, average particle size: 250 nm) was contained in a mixture of an acrylic polyol and a urethane resin so that the P / V ratio was 1. . On one surface of a reflective base material (E6SR manufactured by Toray Industries, Inc., film thickness: 188 μm), the above light reflecting layer forming ink composition was applied by a gravure coating method so that the coating amount was 2 g / m ² . It dried at 60 degreeC and formed the light reflection layer on the said reflective base material.

(Formation of light scattering layer)
An ink composition for forming a light scattering layer was prepared in which geometrically scattering fine particles (silica, average particle size: 2 μm) were contained in urethane acrylate so that the P / V ratio was 0.3. On the light reflection layer, the ink composition for forming a light scattering layer is applied by a gravure coating method so that the coating amount becomes 5 g / m ² , dried at 60 ° C., and then irradiated with an electron beam (165 kV, 5 Mrad). Then, a cross-linking treatment was performed to form a light scattering layer on the light reflecting layer, and a laminate for building materials was obtained in which the reflecting base material, the light reflecting layer, and the light scattering layer were laminated in this order.

[Example 1-2]
A laminate for building material was obtained in the same manner as in Example 1-1 except that the metal oxide white pigment was added so that the P / V ratio in the ink composition for forming a light reflecting layer was 2.

[Example 1-3]
The metal oxide white pigment is contained so that the P / V ratio in the light reflecting layer forming ink composition is 3, and the coating amount of the light scattering layer forming ink composition is 2 g / m ^2. Except that it was applied, a building material laminate was obtained in the same manner as in Example 1-1.

[Example 1-4]
A laminate for building material was obtained in the same manner as in Example 1-1 except that the metal oxide white pigment was added so that the P / V ratio in the ink composition for forming a light reflecting layer was 4.

[Example 1-5]
A laminate for building material was obtained in the same manner as in Example 1-1 except that the metal oxide white pigment was added so that the P / V ratio in the light reflection layer forming ink composition was 5.

[Example 2-1]
A laminate for building materials was obtained in the same manner as in Example 1-1 except that the metal oxide white pigment was added so that the P / V ratio in the ink composition for forming a light reflecting layer was 3.

[Example 2-2]
A laminate for building materials was obtained in the same manner as in Example 2-1, except that the light scattering layer forming ink composition was applied so that the coating amount was 10 g / m ² .

[Example 2-3]
Implementation was performed except that the light reflecting layer forming ink composition was applied at a coating amount of 9 g / m ² and the light scattering layer forming ink composition was applied at a coating amount of 2 g / m ^2. A laminate for building materials was obtained in the same manner as in Example 2-1.

[Example 2-4]
A laminate for building materials was obtained in the same manner as in Example 2-3 except that the light scattering layer forming ink composition was applied so that the coating amount was 5 g / m ² .

[Example 2-5]
A laminate for building materials was obtained in the same manner as in Example 2-3 except that the light scattering layer forming ink composition was applied so that the coating amount was 10 g / m ² .

[Example 3-1]
A metal oxide white pigment is included so that the P / V ratio in the light reflecting layer forming ink composition is 3, and the P / V ratio in the light scattering layer forming ink composition is 0.2. A laminate for building materials was obtained in the same manner as in Example 1-1, except that the sample was mixed with geometrically scattering fine particles.

[Example 3-2]
A laminate for building materials was obtained in the same manner as in Example 3-1, except that the geometrically scattering fine particles were added so that the P / V ratio in the light scattering layer forming ink composition was 0.1.

[Example 3-3]
Example 3 except that the geometric scattering fine particles were contained so that the P / V ratio in the ink composition for forming a light scattering layer was 0.3, and the average particle diameter of the geometric scattering fine particles was 4 μm. The laminated body for building materials was obtained like -1.

[Example 3-4]
Example 3 except that the geometric scattering fine particles were contained so that the P / V ratio in the ink composition for forming a light scattering layer was 0.3, and the average particle diameter of the geometric scattering fine particles was 10 μm. The laminated body for building materials was obtained like -1.

[Comparative Example 1]
Except not having provided the light-scattering layer, it carried out similarly to Example 2-1, and obtained the laminated body for building materials.

[Comparative Example 2]
A building material laminate was obtained in the same manner as in Example 3-1, except that the light-scattering layer-forming ink composition did not contain geometrically scattering fine particles.

[Evaluation]
<Measurement of visible light reflectance and regular reflectance>
About the laminated body for building materials obtained in each of the above examples and comparative examples, the visible light reflectance and the regular reflectance at incident angles and emission angles of 20 °, 45 °, 60 °, 75 °, and 85 ° are as follows. It was measured. The results for each test piece are shown in Table 1. For reference, each reflectance of only the reflective base material is also shown in Table 1.
The measurement method is the same as the measurement method described in “1. Reflective substrate”.

<Weather resistance test>
About the laminated body for building materials obtained in each of the above examples and comparative examples, the following (A) to (C) are defined as one cycle using a super weather resistance tester (Iwasaki Electric Co., Ltd., SUV-W23), A weather resistance test by repeating this for 50 hours and a weather resistance test by repeating for 200 hours were performed.
(A) In an atmosphere of temperature: 63 ° C. and humidity: 50%, an ultraviolet ray having a wavelength of 365 nm is irradiated for 20 hours at an irradiation amount of 60 mW / cm ² .
(B) Watering by shower is performed for 30 seconds.
(C) It is allowed to stand for 4 hours in an atmosphere of temperature: 23 ° C. and humidity: 98% to cause condensation.

<Yellowing after weathering test>
About each test piece after a weather resistance test, yellowing was confirmed by measuring visually and a color difference from the light-scattering-layer surface side of each laminated body for building materials. In the color difference measurement, a spectrophotometer (manufactured by Shimadzu Corporation, model number: UV-3100PC) was used, and the ΔE ^* ab value was measured by a transmission method in accordance with the description of JIS K7105. The ΔE ^* ab value is a color difference formula (ΔE ^* ab = {(ΔL ^* ) 2+ (Δa ^* ) 2+ (Δb ^* ) 2}) according to the (L ^* , a ^* , b ^* ) space color system of the CIE 1976 standard. 1/2). The ΔE ^* ab value is a practically problematic value when it is 3 or more. The results for each test piece are shown in Table 1.

(Standard)
○: ΔE ^* ab value is less than 1 Δ: ΔE ^* ab value is 1 or more and less than 3 ×: ΔE ^* ab value is 3 or more

As shown in Table 1, the building material laminate of each example having a light reflecting layer and a light scattering layer has a higher visible light reflectance and a lower regular reflectance than the reflective base material. It can be seen that high light scattering performance is obtained while maintaining high reflection performance. Furthermore, the ΔE ^* ab values of the building material laminates of each example are extremely low, indicating that they have high weather resistance. On the other hand, in the comparative example in which the scattering layer is not provided or the layer that does not contain the geometric scattering fine particles is provided, the regular reflectance increases as the incident angle increases, and the light scattering performance. Is low.

DESCRIPTION OF SYMBOLS 1 ... Reflective base material 2 ... Metal oxide white pigment 3 ... Light reflection layer 4 ... Geometrical scattering fine particle 5 ... Light scattering layer 10 ... Laminate for building materials (2nd light control member)
DESCRIPTION OF SYMBOLS 20 ... Daylighting system 30, 30A, 30B ... 1st light control member

Claims (3)

A reflective substrate having reflectivity for visible light;
A laminate for building materials having a light reflecting layer and a light scattering layer laminated on one surface of the reflective substrate,
The light reflecting layer is a layer having a particle diameter showing Mie scattering and containing a metal oxide white pigment capable of absorbing ultraviolet rays,
The said light-scattering layer is a layer containing the microparticles | fine-particles which have a particle diameter which shows geometric scattering property, The laminated body for building materials characterized by the above-mentioned.   The laminate for building materials according to claim 1, wherein the reflective base material, the light reflective layer, and the light scattering layer are laminated in this order. A first light control member that reflects incident light in a predetermined direction;
A daylighting system having a second light control member for diffusing the light reflected by the first light control member,
The second light control member has a reflective base material having reflectivity for visible light, and a light reflection layer and a light scattering layer laminated on one surface of the reflective base material,
The light reflecting layer is a layer having a particle diameter showing Mie scattering and containing a metal oxide white pigment capable of absorbing ultraviolet rays,
The daylighting system, wherein the light scattering layer is a layer containing fine particles having a particle diameter exhibiting a geometric scattering property.