WO2019003579A1

WO2019003579A1 - Laminate having heat shielding capability

Info

Publication number: WO2019003579A1
Application number: PCT/JP2018/015598
Authority: WO
Inventors: 一色　眞誠; 信孝青峰
Original assignee: Ａｇｃ株式会社
Priority date: 2017-06-27
Filing date: 2018-04-13
Publication date: 2019-01-03
Also published as: JP2020138325A

Abstract

This laminate has a first member having first and second surfaces, a second member having third and fourth surfaces, and a reflective layer disposed between the first member and the second member, wherein: the difference in refractive index between the first member and the second member is less than 0.05; the laminate has a first side corresponding to the first surface side of the first member and a second side corresponding to the fourth surface side of the second member; the reflectivity Rv of visible light, including the diffuse component, as measured from the first side of the laminate is at least 40%; the specular reflection Rvt of visible light is at most 30%; the energy reflectivity Re is at least 60%; and the transmittance Tv of visible light transmitted from the first side toward the second side of the laminate is at least 1% and less than 30%.

Description

Laminate having heat shielding performance

The present invention relates to a laminate having heat shielding performance.

In response to the recent increase in energy saving awareness, heat shielding members such as window glass and vehicle glass are required to have high solar heat shielding performance (hereinafter, referred to as “heat shielding performance”). Moreover, in order to respond to this request, various researches and developments have been advanced with respect to heat shield members, and several configurations have been proposed as a result.

For example, in a recent window glass called low-E glass, a transparent metal reflection layer is provided on the outdoor side of the window glass, which can suppress the heat of the sun from entering the room.

Generally, the heat shielding performance of the heat shielding member can be represented by a solar radiation shielding coefficient (SC value). The SC value is the solar radiation shielding performance when the solar radiation shielding performance of float glass of 3 mm thickness is 1, and it is the value obtained by dividing the solar radiation heat gain rate (g value: defined in ISO 9050: 2003) by 0.88 And the smaller the value, the higher the heat shielding performance.

JP, 2012-3027, A

In order to realize high heat shielding performance, various heat shielding members have been proposed so far.

However, even with the heat shield members proposed so far, the improvement effect of the heat shield performance is not yet sufficient.

In addition, the heat shielding member so far has sought to improve the heat shielding performance, and has not received much attention for other characteristics.

For example, when the heat shielding member such as a window glass and a vehicle glass is viewed from the outside, it may often feel unpleasant glare. It is desirable to suppress such glare as much as possible. On the other hand, in the window glass and the vehicle glass, the configuration in which the indoor situation can be easily viewed from the outside can be a problem from the viewpoint of privacy. (Conventionally, as a window glass for privacy protection, a glass that scatters light such as frosted glass is used. However, in this case, there is a problem that it is not possible to see an outdoor scene from indoors.)
As described above, there is no example in which the configuration of the heat shielding member is considered in consideration of the improvement of the heat shielding performance and the privacy protection.

For example, Patent Document 1 describes an optical body capable of suppressing the heat island phenomenon. However, this optical body can not be said to be sufficient in any of heat shielding performance and privacy protection.

The present invention has been made in view of such a background, and it is an object of the present invention to provide a laminate having antiglare property and consideration for privacy while having good heat shielding performance. Do.

In the present invention, it is a laminate having a heat shielding performance,
A first member having first and second surfaces;
A second member having third and fourth surfaces;
A reflective layer disposed between the first member and the second member;
Have
The difference Δn in refractive index between the first member and the second member is less than 0.05,
The reflective layer forms a first uneven interface with the second surface of the first member, and a second uneven layer with the third surface of the second member. Form an interface,
The laminate has a first side corresponding to the side of the first surface of the first member, and a second side corresponding to the side of the fourth surface of the second member. And
When measured on the first side of the laminate, the energy reflectance Re is 60% or more, the visible light reflectance Rv including the diffusion component is 40% or more, and the visible light regular reflectance Rvt is Less than 30%,
There is provided a laminate, wherein the transmittance Tv of visible light transmitted from the first side to the second side of the laminate is 1% or more and less than 30%.

In the present invention, it is possible to provide a laminate having good heat shielding performance, antiglare property, and privacy.

It is the figure which showed roughly the cross section of the layered product which has thermal insulation performance by one embodiment of the present invention. FIG. 5 schematically shows a cross section of a laminate having a heat shielding performance according to another embodiment of the present invention. FIG. 7 schematically shows a cross section of a laminate having a heat shielding performance according to still another embodiment of the present invention. FIG. 7 schematically shows a cross section of a laminate having a heat shielding performance according to still another embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(Laminated body having heat shielding performance according to one embodiment of the present invention)
FIG. 1 schematically shows a cross section of a laminate having a heat shielding performance according to an embodiment of the present invention (hereinafter, referred to as “first laminate”).

As shown in FIG. 1, the first stack 100 has a first side 102 and a second side 104. In addition, the first stacked body 100 includes a first member 110, a second member 120, and a reflective layer 130 disposed between the two.

The first member 110 has a first surface 112 and a second surface 114. The first surface 112 is a flat surface, and the second surface 114 is an uneven surface.

The second member 120 has a third surface 122 and a fourth surface 124. The third surface 122 is an irregular surface, and the fourth surface 124 is a flat surface.

The first surface 112 of the first member 110 corresponds to the first side 102 of the first stack 100, and the fourth surface 124 of the second member 120 corresponds to the first surface of the first stack 100. It corresponds to the second side 104.

The reflective layer 130 is disposed on the first member 110 along the uneven shape of the second surface 114 of the first member 110. In other words, the reflective layer 130 is disposed on the first member 110 in contact with the asperities of the second surface 114. Since the reflective layer 130 is relatively thin, a concavo-convex shape corresponding to the concavo-convex shape of the second surface 114 of the first member 110 is generated on the second member 120 side of the reflective layer 130. The second member 120 is disposed on the reflective layer 130 in such a manner as to fill up the unevenness of the reflective layer 130.

As a result, the reflective layer 130 forms a first uneven interface 132 with the second surface 114 of the first member 110, and with the third surface 122 of the second member 120, A second uneven interface 134 is formed.

The refractive index difference Δn between the first member 110 and the second member 120 is less than 0.05. The refractive index difference Δn is preferably less than 0.04.

Here, in the first stacked body 100, the reflective layer 130 reflects most of the light in the near infrared region incident from the first side 102, and visible light incident from the first side 102. Most of the light in the area is also designed to be reflected.

More specifically, when the first laminate 100 is evaluated on the first side 102, the energy reflectance Re is 60% or more, and the visible light reflectance Rv including the diffusion component is 40% or more. Configured

In addition, when the first laminate 100 is evaluated on the first side 102, the visible light regular reflectance Rvt is 30% or less, and the transmittance of visible light transmitted from the first side 102 to the second side 104 The Tv is configured to be 1% or more and less than 30%.

In the present application, “visible light regular reflectance Rvt” means the reflectance of specularly reflected light generated when the surface to be measured is irradiated with visible light. On the other hand, "visible light reflectance Rv containing a diffused component" means a reflectance obtained from all reflected light including scattered light which is generated when the surface to be measured is irradiated with visible light. Such "visible light reflectance Rv including a diffused component" can be evaluated by a spectrophotometric method in which a measurement sample is placed at the reflection measurement port of the integrating sphere. The energy reflectance Re means an energy reflectance including a diffuse component.

With the above-described configuration, in the first stacked body 100, the SC value can be significantly suppressed, and it is possible to exhibit significantly high thermal insulation. For example, in the first laminate 100, when evaluated from the first side 102, an SC value of 0.2 or less can be obtained.

In the first laminate 100, the visible light transmittance Tv is suppressed to 1% or more and less than 30%. For this reason, in the first laminate 100, visible light transmitted from the first side 102 to the second side 104 is significantly suppressed, and the privacy problem as described above can also be alleviated.

Furthermore, in the first stacked body 100, the visible light regular reflectance Rvt on the first side 102 is suppressed to 30% or less. In this case, since much of the reflected light that may be generated by the visible light incident on the first stacked body 100 is scattered, the antiglare property of the first stacked body 100 can be enhanced.

The energy reflectance Re, the visible light reflectance Rv including the diffusion component, and the visible light regular reflectance Rvt described above are the structure of the reflective layer 130, for example, the number of stacked layers constituting the multilayer film, the material of each layer (and This can be achieved by appropriately adjusting the refractive index) and / or the thickness of each layer. In addition, the visible light regular reflectance Rvt can be obtained, for example, by adjusting the form of the unevenness of the second surface 114 of the first member 110.

Furthermore, in the first stacked body 100, the difference Δn in refractive index between the first member 110 and the second member 120 is controlled to be less than 0.05. For this reason, it becomes difficult to produce an angular deviation between the incident angle of visible light incident on the first laminate 100 and the emission angle of visible light emitted from the first laminate 100. Therefore, for example, when the surroundings are viewed from the second side 104 to the first side 102 of the first stacked body 100, it is possible to enhance the sharpness of the image.

Thus, in one embodiment of the present invention, it is possible to provide a laminate having good heat shielding performance, antiglare property, and privacy. Moreover, in the laminated body which concerns, a favorable clearness can be acquired with respect to a transmission image.

(Characteristics of each member)
Next, each member constituting the first laminate 100 will be described in more detail. In addition, when referring to each member, the referential mark shown in FIG. 1 is used.

(First member 110)
The material of the first member 110 is not particularly limited as long as it is “transparent”. Here, "transparent" means that the visible light transmittance has a property of 50% or more.

For example, the first member 110 may be made of resin, plastic or glass. Also, the first member 110 may be colored.

The thickness of the first member 110 is not particularly limited, and a thin thickness in the form of a thin film (for example, 0.03 mm to 0.1 mm) to a thick thickness in the form of a substrate (for example 0.5 mm to 10 mm) Various thicknesses can be selected.

As mentioned above, the second surface 114 of the first member 110 has an irregular surface. The form of the unevenness is not particularly limited as long as the above-mentioned features can be exhibited. For example, the second surface 114 may be a so-called "anti-glare" treated surface.

For example, when the first member 110 is formed of a glass substrate, such anti-glare treatment may be performed by wet or dry etching or sandblasting the glass substrate.

Also, when the first member 110 is made of resin, such an uneven surface may be configured, for example, by curing the resin in a state where the uneven member is pressed against the surface of the uncured resin. .

The second surface 114 preferably has a root mean square gradient of the scale-limited surface (Sdq) defined by ISO 25178-2: 2012 of 0.05 or more and less than 0.6. When the Sdq is 0.05 or more, the visible light regular reflectance Rvt can be suppressed to 30% or less by the inclination formed on the uneven surface. When Sdq is less than 0.6, the film thickness of the reflective film 130 provided on the second surface 114 can be made uniform. Sdq is more preferably 0.07 or more and less than 0.5, and particularly preferably 0.09 or more and less than 0.4. The film thickness deviation of the reflective film 130 is preferably 10% or less, more preferably 5% or less, and particularly preferably 4% or less.

Moreover, it is preferable that the 2nd surface 114 is 1 micrometer-30 micrometers in average length RSm of the roughness curve element prescribed | regulated to JISB0601: 2001. When the RSm is 30 μm or less, the sharpness when viewing through indoors and outdoors is enhanced, and the transmitted image definition C (0.25) defined in JIS K 7374: 2007 can be 80% or more. A haze can be suppressed to 10% or less as RSm is 1 micrometer or more. The RSm is more preferably 3 μm or more and 25 μm or less, and particularly preferably 5 μm or more and 20 μm or less.

(Second member 120)
The material of the second member 120 is not particularly limited as long as it is “transparent”. For example, the second member 120 may be made of resin, plastic or glass. The second member 120 may be made of a material different from that of the first member 110. However, as described above, the second member 120 is selected such that the difference Δn between the refractive index of the second member 120 and the refractive index of the first member 110 is less than 0.05.

Similarly to the first member 110, various thicknesses can be selected for the second member 120 as well.

(Reflective layer 130)
When the reflective layer 130 is evaluated as the first stacked body 100, the energy reflectance Re as described above, the visible light reflectance Rv including a diffused component, the visible light regular reflectance Rvt, the visible light transmittance Tv, and the like The configuration is not particularly limited as long as it is possible to achieve

For example, the reflective layer 130 may be configured of a multilayer film. The multilayer film may have, for example, an alternately stacked structure of a high refractive index film (for example, refractive index ≧ 2) and a low refractive index film (for example, refractive index <2). Examples of the high refractive index film include titania and the like. Moreover, as a low refractive index film | membrane, a silica etc. are mentioned, for example.

Alternatively, the reflective layer 130 may include a silver layer and have a more complex multilayer structure as described below.

The thickness (total thickness) of the reflective layer 130 is preferably in the range of 1 nm to 500 nm, more preferably in the range of 50 nm to 300 nm, and particularly preferably in the range of 100 nm to 250 nm.

The reflective layer 130 may be formed on the uneven surface (the second surface 114) of the first member 110 by a general film forming technique such as, for example, a vapor deposition method, a sputtering method, a PVD method, or a CVD method. it can.

The second concavo-convex interface 134 formed in the reflective layer 130 preferably has the same Sdq and RSm as the second surface 114.

(First laminated body 100)
The first laminate 100 having the characteristics as described above may be used, for example, in the form of a film. It is assumed that such a film is stuck to the surface of a glass member such as window glass and vehicle glass, for example. In this case, the first laminate 100 is applied such that the first side 102 is the "outdoor" side of the glass member and the second side 104 is the "indoor" side.

With such a glass member, due to the above-described effects, it is possible to significantly block the entry of solar radiation into the indoor, and it becomes difficult to view the indoor from the outside, and it is possible to secure the privacy of the indoor. Moreover, the glare by the reflected light reflected from a glass member is reduced significantly. Furthermore, when viewing the inside from the inside, it is possible to see a transmission image without distortion.

(Laminated body having heat shielding performance according to another embodiment of the present invention)
Next, with reference to FIG. 2, a laminate having a heat shielding performance according to another embodiment of the present invention will be described.

In FIG. 2, the cross section of the laminated body (henceforth a "2nd laminated body") which has the thermal insulation performance by another embodiment of this invention is shown roughly.

As shown in FIG. 2, the second stack 200 has a first side 202 and a second side 204. The second stacked body 200 also has a first member 210, a second member 220, and a reflective layer 230 disposed between the two. Furthermore, the second stacked body 200 has a first additional member 240.

The first member 210 has a first surface 212 and a second surface 214. The first surface 212 is not necessarily a flat surface, but is preferably a flat surface. On the other hand, the second surface 214 is an uneven surface.

The second member 220 has a third surface 222 and a fourth surface 224. The third surface 222 is an irregular surface, and the fourth surface 224 is a flat surface.

The first additional member 240 is disposed on the side of the first surface 212 of the first member 210. The first additional member 240 has a fifth surface 242 and a sixth surface 244, and the first additional member 240 contacts the sixth surface 244 with the first surface 212 of the first member 210. It will be arranged as

Thus, the fifth surface 242 of the first additional member 240 corresponds to the first side 202 of the second stack 200. On the other hand, the fourth surface 224 of the second member 220 corresponds to the second side 204 of the second stack 200.

As in the case of the first laminate 100 described above, in the second laminate 200, the reflective layer 230 is formed on the first member 210 along the concavo-convex shape of the second surface 214 of the first member 210. Will be placed. In other words, the reflective layer 230 is disposed on the first member 210 in contact with the asperities of the second surface 214. Since the reflective layer 230 is relatively thin, an uneven shape corresponding to the uneven shape of the second surface 214 of the first member 210 is generated on the second member 220 side of the reflective layer 230. The second member 120 is disposed on the reflective layer 230 in such a manner as to fill up the unevenness of the reflective layer 230.

As a result, the reflective layer 230 forms a first uneven interface 232 with the second surface 214 of the first member 210, and with the third surface 222 of the second member 220, A second uneven interface 234 is formed.

The refractive index difference Δn between the first member 210 and the second member 220 is less than 0.05. Also, the refractive index difference between the first member 210 and the first additional member 240 is approximately zero, for example less than 0.02.

Also in the second stacked body 200, the reflective layer 230 reflects most of the light in the near infrared region incident from the first side 202 and at the same time in the visible light region incident from the first side 202. It is designed to reflect most of the light as well.

More specifically, when the second stacked body 200 is evaluated on the first side 202, the energy reflectance Re is 60% or more, and the visible light reflectance Rv including the diffusion component is 40% or more. Configured

In addition, when the second stacked body 200 is evaluated on the first side 202, the visible light regular reflectance Rvt is 30% or less, and the transmittance of visible light transmitted from the first side 202 to the second side 204 The Tv is configured to be 1% or more and less than 30%.

Therefore, also in the second laminate 200, the same effect as that of the first laminate 100 can be obtained. That is, in the second stacked body 200, it is possible to obtain a significantly suppressed SC value, and it is possible to exhibit a significantly high thermal insulation. For example, in the second stacked body 200, when evaluated from the first side 202, an SC value of 0.2 or less can be obtained.

Further, in the second laminate 200, visible light transmitted from the first side 202 to the second side 204 is significantly suppressed, and the problem of privacy can also be alleviated.

Further, in the second laminate 200, since much of the reflected light that may be generated by the visible light incident on the second laminate 200 is scattered, the antiglare property can be enhanced.

Furthermore, in the second laminate 200, when the surroundings are viewed from the second side 204 toward the first side 202, it is possible to obtain good sharpness for the transmission image.

(Characteristics of each member)
Next, each member constituting the second stacked body 200 will be described in more detail. However, regarding the configuration of the second member 220 and the reflective layer 230 among the members, the above description can be referred to. Therefore, the features of the first member 210 and the first additional member 240 will be mainly described here. Also, when referring to each member, the reference numerals shown in FIG. 2 are used.

(First member 210)
The first member 210 is made of a transparent material such as resin, plastic or glass as described above. Also, the first member 210 may be colored.

The thickness of the first member 210 is not particularly limited, and may be a thin thickness (for example, 0.03 mm to 0.1 mm) in the form of a thin film.

As mentioned above, the second surface 214 of the first member 210 has an irregular surface. The form of the unevenness is not particularly limited as long as the above-mentioned features can be exhibited. For example, the second surface 214 may be a so-called "anti-glare" treated surface.

Alternatively, the first member 210 may be formed by disposing a wet coating layer having asperities on a first additional member 240 described later.

The second surface 214 and the second uneven interface 234 preferably have the same Sdq and RSm as the second surface 114, respectively.

The thickness of the reflective layer 230 is preferably the same as that of the reflective layer 130.

(First additional member 240)
The material of the first additional member 240 is not particularly limited as long as it is “transparent”. For example, the first member 110 may be made of resin, plastic or glass.

Also, the form and thickness of the first member 110 are not particularly limited. For example, if the first member 210 is in the form of a thin film, the first member 110 may be in the form of a substrate having a relatively large thickness capable of supporting it. For example, the first additional member 240 may be formed of a flat glass substrate, and the first member 210 may be formed of an antiglare film.

(Second stack 200)
The second laminate 200 having the above-mentioned features may be applied as a glass member such as window glass and vehicle glass (in particular, rear glass and roof glass, hereinafter the same).

In this case, at least the first additional member 240 is formed of a glass substrate. Also, in this case, the second laminate 200 is used with the first side 202 being the “outdoor” side of the glass member and the second side 104 being the “indoor” side.

With such a glass member, due to the above-described effects, it is possible to significantly block the entry of solar radiation into the indoor, and it becomes difficult to view the indoor from the outside, and it is possible to secure the privacy of the indoor.

Further, the glare caused by the light reflected from the glass member is significantly reduced, and it is possible to view a clear transmission image with little distortion when viewing the outside from indoors.

(Laminated body having heat shielding performance according to still another embodiment of the present invention)
Next, with reference to FIG. 3, a laminate having a heat shielding performance according to still another embodiment of the present invention will be described.

In FIG. 3, the cross section of the laminated body (henceforth a "3rd laminated body") which has the thermal insulation performance by further another embodiment of this invention is shown roughly.

As shown in FIG. 3, the third stack 300 has a first side 302 and a second side 304. In addition, the third stacked body 300 includes a first member 310, a second member 320, and a reflective layer 330 disposed therebetween. Furthermore, the third stacked body 300 has a second additional member 350.

The first member 310 has a first surface 312 and a second surface 314. The first surface 312 is a flat surface and the second surface 314 is an irregular surface.

The second member 320 has a third surface 322 and a fourth surface 324. The third surface 322 is an uneven surface. On the other hand, the fourth surface 324 is not necessarily a flat surface, but is preferably a flat surface.

The second additional member 350 is disposed on the side of the fourth surface 324 of the second member 320. The second additional member 350 has a seventh surface 352 and an eighth surface 354, and the second additional member 350 makes the seventh surface 352 contact the fourth surface 324 of the second member 320. It will be arranged as

Thus, the eighth surface 354 of the second additional member 350 corresponds to the second side 304 of the third stack 300. On the other hand, the first surface 312 of the first member 310 corresponds to the first side 302 of the third stack 300.

As in the case of the first laminate 100 described above, in the third laminate 300, the reflective layer 330 is formed on the first member 310 along the concavo-convex shape of the second surface 314 of the first member 310. Will be placed. In other words, the reflective layer 330 is disposed on the first member 310 in contact with the asperities of the second surface 314. Since the reflective layer 330 is relatively thin, a concavo-convex shape corresponding to the concavo-convex shape of the second surface 314 of the first member 310 is generated on the second member 320 side of the reflective layer 330. The second member 320 is disposed on the reflective layer 330 in such a manner as to fill up the unevenness of the reflective layer 330.

As a result, the reflective layer 330 forms a first uneven interface 332 with the second surface 314 of the first member 310, and with the third surface 322 of the second member 320, A second uneven interface 334 is formed.

The refractive index difference Δn between the first member 310 and the second member 320 is less than 0.05. Also, the refractive index difference between the second member 320 and the second additional member 350 is approximately 0 (zero), for example less than 0.01.

Also in the third stacked body 300, the reflective layer 330 reflects most of the light in the near infrared region incident from the first side 302, and at the same time in the visible light region incident from the first side 302. It is designed to reflect most of the light as well.

More specifically, when the third stacked body 300 is evaluated on the first side 302, the energy reflectance Re is 60% or more, and the visible light reflectance Rv including the diffusion component is 40% or more. Configured

In the third stacked body 300, when evaluated on the first side 302, the visible light regular reflectance Rvt is 30% or less, and the transmittance of visible light transmitted from the first side 302 to the second side 304 The Tv is configured to be 1% or more and less than 30%.

Therefore, also in the third stacked body 300, the same effect as that of the first stacked body 100 can be obtained. That is, in the third stacked body 300, a significantly suppressed SC value can be obtained, and a significantly high heat shield can be exhibited. For example, in the third stacked body 300, when evaluated from the first side 302, an SC value of 0.2 or less can be obtained.

Further, in the third laminate 300, visible light transmitted from the first side 302 to the second side 304 is significantly suppressed, and the problem of privacy can be alleviated.

Further, in the third laminate 300, since much of the reflected light that may be generated by the visible light incident on the third laminate 300 is scattered, the antiglare property can be enhanced.

Furthermore, in the third stacked body 300, when the surroundings are viewed from the second side 304 toward the first side 302, it is possible to obtain good sharpness for the transmission image.

(Characteristics of each member)
Next, each member constituting the third stacked body 300 will be described in more detail. However, regarding the configuration of the second member 320 and the reflective layer 330 among the members, the above description can be referred to. Therefore, the features of the first member 310 and the second additional member 350 will be mainly described here. Also, when referring to each member, the reference numerals shown in FIG. 3 are used.

(First member 310)
The material of the first member 310 is not particularly limited as long as the material is “transparent”. For example, the first member 310 may be made of resin, plastic or glass.

The thickness of the first member 310 is not particularly limited, and a thin thickness in the form of a thin film (for example, 0.03 mm to 0.3 mm) to a thick thickness in the form of a substrate (for example 0.3 mm to 10 mm) Various thicknesses can be selected.

As mentioned above, the second surface 314 of the first member 310 has an irregular surface. The form of the unevenness is not particularly limited as long as the above-mentioned features can be exhibited. For example, the second surface 314 may be a so-called "anti-glare" treated surface.

For example, when the first member 310 is formed of a glass substrate, such antiglare treatment may be performed by wet or dry etching or sandblasting the glass substrate.

Second surface 314 and second relief interface 334 preferably have similar Sdq and RSm to second surface 114, respectively.

The thickness of the reflective layer 330 is preferably the same as that of the reflective layer 130.

(Second additional member 350)
The material of the second additional member 350 is not particularly limited as long as it is “transparent”. For example, the second additional member 350 may be made of resin, plastic or glass.

Also, the form and thickness of the second additional member 350 are not particularly limited. For example, the second additional member 350 may be in the form of a substrate having a relatively thick thickness. For example, the second additional member 350 may be made of a glass substrate.

(Third stack 300)
The third laminate 300 having the above-mentioned features may be applied as a glass member such as a window glass and a glass for a vehicle, for example.

For example, when the third laminate 300 is applied to a glass for a vehicle, the first member 310 and the second additional member 350 are both formed of a glass substrate, and the second member 320 is a resin film (so-called Intermediate film). Further, in this case, the third stacked body 300 is used such that the first side 302 is the outside of the vehicle glass and the second side 304 is the inside of the vehicle.

With such a glass for a vehicle, by the above-described effects, it is possible to significantly block the ingress of solar radiation into the interior of the vehicle, and it becomes difficult to visually identify the interior of the vehicle from the exterior of the vehicle, and privacy in the interior of the vehicle can be secured. Moreover, the glare by the reflected light reflected from a glass member is reduced significantly. Furthermore, when viewing the inside from the inside, it is possible to see a transmission image without distortion.

(Laminated body having heat shielding performance according to still another embodiment of the present invention)
Next, with reference to FIG. 4, a laminate having a heat shielding performance according to still another embodiment of the present invention will be described.

In FIG. 4, the cross section of the laminated body (henceforth a "4th laminated body") which has the thermal insulation performance by further another embodiment of this invention is shown roughly.

As shown in FIG. 4, the fourth stacked body 400 has a configuration in which the second stacked body 200 described above and the third stacked body 300 are combined. That is, the fourth stacked body 400 has the first side 402 and the second side 404, and the first additional member 440, the first member 410, the reflective layer 430, and the second member 420. And the second additional member 450 in this order.

The respective members can be referred to the descriptions of the second stack 200 and the third stack 300 described above, and thus will not be further described here. However, as shown in FIG. 4, it should be noted that reference numerals in the 400s are used for each member included in the fourth stacked body 400.

Also in the fourth stacked body 400, the reflective layer 430 reflects most of the light in the near infrared region incident from the first side 402, and at the same time, in the visible light region incident from the first side 402. It is designed to reflect most of the light as well.

More specifically, when the fourth stacked body 400 is evaluated on the first side 402, the energy reflectance Re is 60% or more, and the visible light reflectance Rv including the diffusion component is 40% or more. Configured

Further, in the fourth laminate 400, when evaluated on the first side 402, the visible light regular reflectance Rvt is 30% or less, and the transmittance of visible light transmitted from the first side 402 to the second side 404 The Tv is configured to be 1% or more and less than 30%.

Therefore, also in the fourth stacked body 400, the same effect as that of the first stacked body 100 can be obtained. That is, in the fourth stacked body 400, it is possible to obtain a significantly suppressed SC value, and it is possible to exhibit a significantly high thermal insulation. For example, in the fourth stacked body 400, when evaluated from the first side 402, an SC value of 0.2 or less can be obtained.

Further, in the fourth stacked body 400, visible light transmitted from the first side 402 to the second side 404 is significantly suppressed, and the problem of privacy can also be alleviated.

Further, in the fourth stacked body 400, much of the reflected light that may be generated by the visible light incident on the fourth stacked body 400 is scattered, so that the antiglare property can be enhanced.

Furthermore, in the fourth stacked body 400, when the surroundings are viewed from the second side 404 to the first side 402, it is possible to obtain good sharpness for the transmission image.

(Fourth stack 400)
The above description can be referred to for each member constituting the fourth stacked body 400.

Second surface 414 and second relief interface 434 preferably have similar Sdq and RSm to second surface 114, respectively.

The thickness of the reflective layer 430 is preferably the same as that of the reflective layer 130.

Here, an application example of the fourth stacked body 400 will be mainly described. Further, when referring to each member, the reference numerals shown in FIG. 4 are used.

The fourth stacked body 400 may be applied as, for example, a glass member such as a window glass and a glass for a vehicle.

In this case, the first additional member 440 and the second additional member 450 are formed of a glass substrate. In addition, the first member 410 has a refractive index similar to that of the first additional member 440 and is made of a resin film having asperities, and the second member 420 is made of a resin film (so-called intermediate film). It is good.

Also, in this case, in the fourth laminate 400, the first side 402 is the outdoor (or outside of the car, and so forth) side of the glass member, and the second side 404 is the indoor (or in car, below) side. To be used.

(Method of manufacturing laminate having heat shielding performance according to one embodiment of the present invention)
Next, a method of manufacturing a laminate having a heat shielding performance according to an embodiment of the present invention will be described.

Here, as an example, an example of the manufacturing method will be described by taking the third stacked body 300 shown in FIG. 3 as an example. Therefore, when referring to each member, the reference numerals shown in FIG. 3 are used.

However, it is apparent to one skilled in the art that the following description is also applicable to a laminate according to another embodiment of the present invention.

When manufacturing the third stacked body 300, first, a first glass substrate to be the first member 310 and a second glass substrate to be the second additional member 350 are prepared.

Next, antiglare treatment is applied to one surface of the first glass substrate. Thereby, the first member 310 having the unevenness on the second surface 314 is manufactured.

The antiglare treatment on the second surface 314 of the first glass substrate is preferably an etching treatment, a sand blasting treatment or a deposition treatment.

In the case of the etching process, the second surface 314 can be etched with a hydrogen fluoride (HF) aqueous solution having a concentration of 15 to 50% to form a fine uneven shape on the second surface 314. The Sdq and RSm of the second surface 314 can be controlled by changing the concentration of HF aqueous solution used for the etching process and the processing time. For the etching process, a chemical solution in which potassium fluoride is mixed with a hydrogen fluoride aqueous solution, or a mixed chemical solution of hydrogen fluoride and hydrogen chloride may be used.
In addition, as a deposition treatment, a known wet coating method (spray coating method, electrostatic coating method, spin coating method, dip coating method, die coating method, curtain coating method, screen coating method, ink jet method, flow coating method, gravure coating method , Bar coat method, flexo coat method, slit coat method, roll coat method, etc. can be used. Examples of the film formed by the deposition treatment include a film containing silica as a main component. Here, the main component is a film containing 70% by mass in terms of oxide content. The membrane may contain fine particles, and the fine particles may be scaly, spherical or the like. By using the fine particles, a desired uneven shape can be formed.

Next, the reflective layer 330 is disposed on the second surface 314 of the first member 310. The reflective layer is formed by, for example, a film forming technique such as sputtering.

Next, the second member 320 is placed on the reflective layer 330. The second member 320 is made of, for example, a resin such as a thermosetting or ultraviolet (UV) curable resin. Next, a second glass substrate is placed on the second member 320. Thereafter, the second glass substrate is placed on the reflective layer 330 such that the second member 320 is in contact with the reflective layer 330.

Alternatively, a resin may be provided on one surface of the second glass substrate, and the second glass substrate may be provided on the reflective layer 330.

Next, in this state, the second member 320 is cured. For example, if the second member 320 is comprised of a thermosetting resin, the assembly is heated to a predetermined temperature, thereby curing the second member 320. Alternatively, if the second member 320 is comprised of a UV curable resin, the assembly is irradiated with UV light, thereby curing the second member 320.

When the second member 320 is cured, the first glass substrate having the reflective layer 330 and the second glass substrate are bonded via the second member 320, and the third stacked body 300 is configured. Ru.

The third stacked body 300 can be manufactured by such a method.

Hereinafter, examples of the present invention will be described. In the following description, Examples 1 to 6 and Examples 9 to 11 are Examples, and Example 7 is a Comparative Example. Example 8 is a reference example.

(Example 1)
A laminate having a configuration as shown in FIG. 3 was produced by the following method.

First, a glass substrate (soda lime glass) having a thickness of 2 mm was prepared as a first member.

One surface (referred to as a second surface) of this glass substrate was immersed in a frost treatment solution containing 2 wt% hydrogen fluoride and 3 wt% potassium fluoride for 3 minutes to perform pre-etching treatment. Furthermore, after the glass substrate was washed, it was immersed in an aqueous solution containing 7.5 wt% hydrogen fluoride and 7.5 wt% hydrogen chloride for 18 minutes (main etching treatment) to form unevenness on the second surface.

Next, a reflective layer was formed on the second surface of the glass substrate by sputtering.

The reflective layer is made of zinc oxide film (5 nm (target film thickness; target same as the following)) / silver film (68 nm) / aluminum-doped zinc oxide film (5 nm) / zinc-doped tin oxide film (80 nm) / zinc oxide film (5 nm) / A seven-layer structure of silver film (68 nm) / aluminum-doped zinc oxide film (5 nm) was used. The thickness (total thickness) of the reflective layer was targeted at 236 nm.

The aluminum-doped zinc oxide film was formed by introducing argon gas from a target having a weight ratio of aluminum oxide to zinc oxide of 5:95. Further, the zinc-doped tin oxide film was formed by reactive sputtering by introducing oxygen gas using a target having a weight ratio of zinc to tin of 50:50.

Thereby, the first assembly in which the reflective layer was provided on the uneven surface of the glass substrate was obtained.

Next, another glass substrate (soda lime glass) having a thickness of 2 mm was prepared as a second additional member. Moreover, the resin layer as a 2nd member was installed in one surface of this glass substrate. The resin layer was made of thermoplastic polyvinyl butyral.

Thereby, the 2nd assembly which consists of a glass substrate and a resin layer was obtained.

Next, the second assembly was stacked on the first assembly. At this time, the reflective layer of the first assembly and the resin layer of the second assembly were in contact with each other, and they were laminated. Thereafter, the resin layer was cured to bond the second assembly and the first assembly to each other.

Thus, a laminate according to Example 1 was produced. The thickness of the resin layer was approximately 750 μm. In the laminate according to Example 1, the difference Δn of the refractive index between the first member (glass substrate) and the resin layer is 0.02.

(Example 2)
A laminate was produced in the same manner as in Example 1. However, in this example 2, the laminated body was manufactured by setting the processing time of the main etching of the second surface of the first member to 9 minutes. As a result, a larger unevenness was formed on the second surface of the first member as compared with Example 1.

The other preparation conditions are the same as in Example 1.

Thus, a laminate according to Example 2 was produced.

(Example 3)
A laminate was produced in the same manner as in Example 1. However, in the third example, the configuration of the reflective layer was changed from that of the first example. That is, the reflective layer is zinc oxide film (5 nm) / silver film (41 nm) / aluminum-doped zinc oxide film (5 nm) / zinc-doped tin oxide film (79 nm) / zinc oxide film (5 nm) / silver film (23 nm) / It was set as 7 layer structure of the aluminum dope zinc oxide film (5 nm). The thickness (total thickness) of the reflective layer was targeted at 163 nm.

The other preparation conditions are the same as in Example 1.

Thus, a laminate according to Example 3 was produced.

(Example 4)
A laminate was produced in the same manner as in Example 2. However, in Example 4, the configuration of Example 3 described above was adopted as the reflective layer. The other preparation conditions are the same as in Example 2.

Thus, a laminate according to Example 4 was produced.

(Example 5)
A laminate was produced in the same manner as in Example 1. However, in Example 5, the configuration of the reflective layer was changed from that of Example 1. That is, the reflective layer is zinc oxide film (7 nm) / silver film (25 nm) / aluminum-doped zinc oxide film (7.5 nm) / zinc tin oxide film (77 nm) / zinc oxide film (7 nm) / silver film (10 nm) / 8-layer structure of aluminum-doped zinc oxide film (7.5 nm) / zinc tin oxide film (24 nm). The thickness (total thickness) of the reflective layer was targeted at 165 nm.

The other preparation conditions are the same as in Example 1.

Thus, a laminate according to Example 5 was produced.

(Example 6)
A laminate was produced in the same manner as in Example 2. However, in the sixth example, the configuration of the fifth example described above is adopted as the reflective layer. The other preparation conditions are the same as in Example 2.

Thus, a laminate according to Example 6 was produced.

(Example 7)
A laminate was produced in the same manner as in Example 1. However, in this example 7, the etching process was not performed on the first member. Therefore, the second surface of the first member was relatively smooth, and the above-mentioned reflective layer was deposited on the smooth surface.

The other preparation conditions are the same as in Example 1.

Thus, a laminate according to Example 7 was produced.

(Example 9)
A laminate was produced in the same manner as in Example 2 except that in the pre-etching treatment for the second surface of the first member, the immersion time in the frost treatment liquid was 6 minutes. The configuration of the reflective layer was the same as in Example 5.

(Example 10)
In the main etching process for the second surface of the first member, a laminate was produced in the same manner as in Example 2 except that the treatment time was 1 minute.

(Example 11)
In the main etching process for the second surface of the first member, a laminate was produced in the same manner as in Example 1 except that the treatment time was 30 minutes.

(Evaluation)
The following evaluation was implemented using each laminated body produced by the above-mentioned method.

(Evaluation of optical characteristics and heat shielding properties)
A visible light transmittance Tv, visible light reflectance Rv ₍₁₎ and Rv ₍₂₎ including diffused components, visible light regular reflectance Rvt ₍₁₎ and Rvt ₍₂₎ , using the laminate according to Examples 1 to 7. The energy transmittance Te, the energy reflectance Re, the energy absorption rate Ae, and the solar heat gain rate (g value) were evaluated. Moreover, the solar radiation shielding coefficient (SC value) was calculated | required from the obtained result.

Here, the visible light transmittance Tv, the energy transmittance Te, the energy reflectance Re, the energy absorptivity Ae, and the solar heat acquisition rate (g value) are all measured light from the side of the first member of the laminate. It is a value measured by irradiation.

On the other hand, the visible light reflectance including the diffusion component is represented by Rv ₍₁₎ , which is the value measured on the side of the first member in each laminate, and the value measured on the side of the second member is Rv ₍ Represented by ₂₎ . Similarly, for the visible light regular reflectance, in each laminate, the value measured on the first member side is represented by Rvt ₍₁₎ , and the value measured on the second member side is represented by Rvt ₍₂₎ It shall represent.

For measurement, a spectrophotometer (U-4100: manufactured by Hitachi, Ltd.) was used, and each optical parameter was evaluated by a method in accordance with ISO 9050: 2003.

The visible light regular reflectance Rvt ₍₁₎ irradiates the measurement light from the side of the first member of each laminate at an angle inclined 5 ° with respect to the normal, and the regular reflection light generated at this time is It evaluated by detecting. Similarly, the visible light regular reflectance Rvt ₍₂₎ irradiates the measurement light from the side of the second member of each stack at an angle inclined 5 ° with respect to the normal, and the specularly reflected light generated at this time It was evaluated by detecting

In addition, the visible light reflectance Rv ₍₁₎ containing the diffusion component uses an integrating sphere of diameter 60φ attached to the measuring instrument, and the measuring light is transmitted to the normal from the side of the first member of each laminate The light was irradiated at an angle of 8.degree. And evaluated by detecting the light generated at this time. Similarly, the visible light reflectance Rv ₍₂₎ containing the diffusion component is irradiated from the side of the second member of each stack at an angle inclined by 8 ° with respect to the normal, and the light generated at this time is detected It evaluated by doing.

Further, the energy reflectance Re was evaluated by the same method as the visible light reflectance Rv ₍₁₎ containing the diffusion component. However, light of a solar radiation wavelength range was used as measurement light.

The SC value is obtained from the obtained g value

SC value = g value / 0.88

Calculated by

(Sdq and Rsm)
The surface shape was measured using a laser microscope (VK-X250 manufactured by Keyence Corporation). A 50 × objective was used. The measurement conditions were a high definition mode, the measurement pitch was 0.1 μm, and the RPD function was on.

RSm was determined using multi-line roughness measurement of Keyence analysis software. For multi-line setting, select “10” for the number of surroundings and “30” for the interval, select “roughness” for measurement type, “none” for both λs and λc for cutoff, and check for correction of termination effect Put in and measured.

Sdq was determined using analysis software SPIP (Image Metrology). The measured surface shape data is read by analysis software SPIP (Image Metrology), S-filtering (1 μm) of the Analyze menu is applied, and Roughness Analysis is performed. At Roughness Analysis, Plane Correction was performed on "Subtract Plane", and Sdq values were obtained by including Sdq in the output parameters to obtain Sdq values.

Table 1 below summarizes the results obtained for each laminate.

In Table 1, the column of “Example 8” shows each optical parameter calculated from the optical body described in JP 2012-3027 A for reference.

From the results of Table 1, it can be seen that in the laminate according to Example 7, the visible light regular reflectances Rvt ₍₁₎ and Rvt ₍₂₎ both show high values exceeding 50%. In such a laminate, the reflection of light may cause the viewer to feel unpleasant glare.

Moreover, the conventional optical body shown in the column of Example 8 has an SC value of more than 0.5 and does not have a very good heat shielding function. Further, in this optical body, the visible light transmittance Tv is about 42%, and the visible light reflectance Rv ₍₁₎ including the diffusion component is 11%. In such an optical body, there is a problem from the viewpoint of privacy because the indoor situation seems to be easily visible from the outside.

On the other hand, in the laminates according to Examples 1 to 6 and 9 to 11, all have SC values of 0.2 or less, and it can be seen that they have good heat shielding performance.

In each of the laminates according to Examples 1 to 6 and 9 to 11, the visible light transmittance Tv is less than 30%, and the visible light reflectance Rv ₍₁₎ including the diffusion component is 40% or more. ing. Therefore, in these laminates, privacy can be protected.

Furthermore, in each of the laminates according to Examples 1 to 6 and 9 to 11, the visible light regular reflectance Rvt ₍₁₎ is 30% or less. Therefore, in these laminates, when viewed from the side of the first member, the glare can be significantly reduced.

Thus, the laminates according to Example 1 to Example 6 and Example 9 to Example 11 were confirmed to have good heat shielding performance and also to have good properties from the viewpoint of antiglare property and privacy protection. .

(Evaluation of transmission image definition)
Next, the laminates according to Examples 1 to 6 were used to evaluate the transmitted image clarity.

This evaluation was measured based on JIS-K7374 using ICM-1T manufactured by Suga Test Instruments.

(Haze)
Based on JIS-K7136, it measured using Suga Test Instruments make haze meter HZ-V3.

(Film thickness deviation of reflective film)
The film thickness deviation was measured from SEM observation of the cross section. Cross-sections are made by breaking glass to make active cross-sections, then flatten the cross-sections with ion milling device E-3500 (manufactured by Hitachi High-Technologies Corporation), apply osmium coating, FE-SEM SU-70 (Hitachi High-Technologies) ) At a magnification of 250,000. Five observation images were taken, film thicknesses at five locations were measured in each image, and standard deviations of 25 data were obtained.

In Table 2 below, in each laminate, transmission image sharpness C (1.0), C (0.25), haze, and film thickness deviation of the reflective film when using an optical comb of 1 mm width It shows collectively.

In all of the laminates according to Examples 1 to 6, good transmitted image sharpness of over 90 was obtained. Further, in the laminates according to Examples 1 to 6, 9 and 11, the RSm of the second surface of the first member was 1 μm or more, and the haze was 10% or less. Furthermore, in the laminates according to Examples 1 to 6, 10, and 11, Sdq of the second surface of the first member is 0.6 or less, and the thickness deviation of the reflective film is suppressed to 5% or less. It was possible to secure in-plane heat shielding performance, privacy protection and antiglare properties.

The present application claims priority based on Japanese Patent Application No. 2017-125287 filed on June 27, 2017, the entire contents of which are incorporated herein by reference.

100 first laminated body 102 first side 104 second side 110 first member 112 first surface 114 second surface 120 second member 122 third surface 124 fourth surface 130 reflective layer 132 First uneven interface 134 second uneven interface 200 second laminate 202 first side 204 second side 210 first member 212 first surface 214 second surface 220 second member 222 third The surface 224 fourth surface 230 reflective layer 232 first uneven interface 234 second uneven interface 240 first additional member 242 fifth surface 244 sixth surface 300 third laminate 302 first side 304 Second side 310 first member 312 first surface 314 second surface 320 second member 322 third surface 324 Fourth surface 330 reflective layer 332 first uneven interface 334 second uneven interface 350 second additional member 352 seventh surface 354 eighth surface 400 fourth laminated body 402 first side 404 second Side 410 First member 412 First surface 414 Second surface 420 Second member 422 Third surface 424 Fourth surface 430 Reflective layer 432 First interface 434 Second interface 440 First additional member 442 fifth surface 444 sixth surface 450 second additional member 452 seventh surface 454 eighth surface

Claims

A laminate having a heat shielding performance,
A first member having first and second surfaces;
A second member having third and fourth surfaces;
A reflective layer disposed between the first member and the second member;
Have
The difference Δn in refractive index between the first member and the second member is less than 0.05,
The reflective layer forms a first uneven interface with the second surface of the first member, and a second uneven layer with the third surface of the second member. Form an interface,
The laminate has a first side corresponding to the side of the first surface of the first member, and a second side corresponding to the side of the fourth surface of the second member. And
When measured on the first side of the laminate, the energy reflectance Re is 60% or more, the visible light reflectance Rv including the diffusion component is 40% or more, and the visible light regular reflectance Rvt is Less than 30%,
The laminated body whose transmittance | permeability Tv of the visible light permeate | transmitted toward the said 2nd side from the said 1st side of the said laminated body is 1% or more and less than 30%.
The laminate according to claim 1, wherein the laminate has an SC value of 0.25 or less.
The laminate according to claim 1, wherein the reflective layer has a thickness in the range of 100 nm to 300 nm.
The laminate according to any one of claims 1 to 3, wherein the reflective layer is composed of a multilayer film.
The layered product according to any one of claims 1 to 4 in which said 1st member is a glass substrate.
Furthermore, a first additional member is provided on the side of the first surface of the first member,
The laminate according to any one of claims 1 to 4, wherein the first member is made of a resin, and the first additional member is made of a glass substrate.
The laminate according to any one of claims 1 to 6, wherein the second member is made of a resin.
Furthermore, a second additional member is provided on the side of the fourth surface of the second member,
The layered product according to any one of claims 1 to 7 in which said 2nd additional member comprises a glass substrate.
The laminate according to claim 8, wherein the laminate is a window glass or a vehicle glass.
The second surface has a root mean square gradient of the scale-limited surface (Sdq) defined in ISO 25178-2: 2012 of 0.05 or more and less than 0.6. The laminate according to any one of the above.
The laminate according to any one of claims 1 to 10, wherein the second surface has an average length RSm of a roughness curvilinear element defined in JIS B 0601: 2001 of 1 μm to 30 μm.