Glass composite

Abstract

To enhance electromagnetic wave transmittance and light transmission while reducing reflection at nighttime or the like.SOLUTION: A light-reflecting layer B includes a thick portion B3 in a laminating direction Z and a thin portion having a thickness in the laminating direction Z that is less than or equal to two-thirds the thickness of the thick portion B3. The thin portion includes a first metal thin portion that is continuously and integrally provided in a plan view orthogonal to a first emission surface H1 and has a planar area of 5 cm2 or more in the plan view, and a second metal thin portion B2 that is continuously and integrally provided in the plan view and has a planar area smaller than that of the first metal thin portion. The second metal thin portion B2 is provided in a dispersed distribution in the plan view as a plurality of elements, and the overall surface has an average solar reflectance of 40% or more and an average emissivity, which is the wavelength average of infrared light emissivity in a range of 8 μm to 13 μm, of 80% or more.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a glass composite that has at least one pair of glass layers as a laminated glass and exhibits radiative cooling function. [Background technology]

[0002] Radiative cooling is known as a function for cooling objects. Radiative cooling is a phenomenon in which a substance's temperature drops when it radiates electromagnetic waves such as infrared rays into its surroundings. By utilizing this phenomenon, it is possible to realize, for example, a hybrid cooling device that cools an object without consuming energy such as electricity.

[0003] Patent Document 1 discloses a glass composite in which a high-emissivity coating layer that emits infrared light from its radiation surface and a low-emissivity coating layer that reflects light are laminated on a glass substrate. Here, it is noted that the low-emissivity coating layer includes a shielding layer that blocks infrared and ultraviolet rays, and that the shielding layer is made of a metal material such as silver. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2022-543529 Summary of the Invention [Problem to be solved by the invention]

[0005] When a glass composite has a shielding layer made of a metal material such as silver, as in the glass composite disclosed in Patent Document 1, for example, in a structure such as a vehicle having a window that separates an external area from an internal area with the glass composite, there are problems such as the blocking of electromagnetic waves used for communication between the external area and the internal area, poor light transmission from the external area to the internal area, and increased reflection when viewing the external area from the internal area through the glass composite at night. However, the technology disclosed in Patent Document 1 does not recognize this problem, and there is room for improvement.

[0006] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a glass composite that can improve electromagnetic wave transmittance and daylighting properties and can reduce glare at night, etc. [Means for solving the problem]

[0007] The glass composite to achieve the above object has the following characteristic configuration: an infrared radiation glass layer that emits infrared light from a first radiation surface that is a radiation surface; and a back surface glass layer that is provided opposite to a surface of the infrared radiation glass layer opposite to a side on which the first radiation surface is present, a light-reflecting layer that reflects light is provided between the infrared radiation glass layer and the rear surface glass layer; the light reflecting layer has a thick portion in a stacking direction and a thin portion whose thickness in the stacking direction is 2 / 3 or less of the thickness of the thick portion, The thin portion is provided continuously and integrally in a plan view perpendicular to the first radiation surface, and has an area of ​​5 cm 2 a first metal thin portion having an area equal to or greater than the area of ​​the first metal thin portion, and a second metal thin portion provided integrally and continuously in the plan view and having an area in the plan view less than the area of ​​the first metal thin portion, The second thin metal portion is provided in a plurality of portions in a dispersed and distributed manner in the plan view, The overall surface average solar reflectance is 40% or more, and the surface average emissivity, which is the wavelength average of the emissivity of infrared light in the range of 8 μm to 13 μm, is 80% or more.

[0008] According to the above characteristic configuration, the light reflecting layer has a thick portion in the stacking direction and a thin portion whose thickness in the stacking direction is 2 / 3 or less of the thickness of the thick portion, and the thin portion is provided continuously and integrally in a plan view perpendicular to the first radiation surface and has an area of ​​5 cm in a plan view. 2Since the glass composite has a first thin metal portion with the above area, by setting the thickness of the first thin metal portion to an appropriate thickness that allows electromagnetic waves for communication to pass through, it becomes possible to communicate via electromagnetic waves through the glass composite. Furthermore, as the thin-walled portion of the light-reflecting layer, a plurality of second thin-walled metal portions are provided as continuous, integral portions in a planar view and whose area in a planar view is less than the area of ​​the first thin-walled metal portion, and are provided in a dispersed and distributed form in a planar view, so that a predetermined amount of light can be obtained through the glass composite in a dispersed form in the surface direction along the radiating surface. Furthermore, the second thin metal portions, which are provided in a dispersed manner in a plan view, have a smaller area in a plan view than the first thin metal portions, so that a certain degree of reflectivity can be ensured as a light reflective layer. With the above-described configuration, it is possible to realize a glass composite having laminated glass that has an overall surface average solar reflectance of 40% or more and an average surface emissivity, which is the wavelength average of the emissivity of infrared light of 8 μm or more and 13 μm or less, of 80% or more, thereby improving electromagnetic wave transmittance and daylighting properties and reducing glare at night, etc.

[0009] Further characteristic features of the glass composite include: the light-reflecting layer is a metal-deposited layer formed by depositing a metal on a resin material, the metal is at least one of silver, a silver alloy, aluminum, an aluminum alloy, and a copper alloy; The intermediate resin that bonds the infrared radiation glass layer and the metal vapor deposition layer, and the back glass layer and the metal vapor deposition layer, is made of one or more of polyvinyl butyral, polyethylene vinyl acetate, and polyurethane.

[0010] As described above, a metal vapor deposition layer formed by vapor-depositing a metal onto a resin material is used as the light-reflecting layer, and the metal is at least one of silver, a silver alloy, aluminum, an aluminum alloy, and a copper alloy. The infrared-emitting glass layer and the metal vapor deposition layer, and the rear glass layer and the metal vapor deposition layer are bonded together with an intermediate resin made of one of polyvinyl butyral, polyethylene vinyl acetate, and polyurethane, so that the infrared-emitting glass layer and the rear glass layer can be well bonded together with the light-reflecting layer interposed therebetween. Incidentally, in this configuration, the resin material on which the metal serving as the light-reflecting layer is vapor-deposited is made of one of polyvinyl butyral, polyethylene vinyl acetate, polyurethane, and polyethylene terephthalate, thereby achieving good adhesion using the intermediate resin.

[0011] Further characteristic features of the glass composite include: the light-reflecting layer is a ceramic layer formed on the surface of the infrared radiation glass layer, The intermediate resin that bonds the light-reflecting layer and the rear glass layer is made of one of polyvinyl butyral, polyethylene vinyl acetate, and polyurethane.

[0012] As in the above-described characteristic configuration, the light-reflecting layer is a ceramic layer formed on the surface of the infrared-emitting glass layer, and the light-reflecting layer and the rear glass layer are bonded together with an intermediate resin made of one of polyvinyl butyral, polyethylene vinyl acetate, and polyurethane, thereby enabling the infrared-emitting glass layer and the rear glass layer to be well bonded together with the light-reflecting layer made of ceramics interposed therebetween.

[0013] Further characteristic features of the glass composite include: The thickness of each of the first thin metal portion and the second thin metal portion in the stacking direction is 0 nm or more and 50 nm or less. Furthermore, it is preferable that the thickness of each of the first thin metal portion and the second thin metal portion in the stacking direction is 0 nm or more and 10 nm or less.

[0014] As in the above characteristic configuration, the thickness of each of the first thin metal portion and the second thin metal portion in the stacking direction is preferably 0 nm or more and 50 nm or less, and more preferably 0 nm or more and 10 nm or less. The inventors have determined that the thickness of the first metal thin portion in the product direction is 50 nm or less, and that the area in plan view is 5 cm2 as described above. 2 It has been confirmed that by doing the above, electromagnetic waves for communication can be transmitted well and communication can be carried out. Furthermore, by having a certain area ratio of thick sections and making the thickness of the second metal thin section in the product direction 50 nm or less, it has been confirmed that the glass laminate as a whole can achieve an average surface solar reflectance of 40% or more while also achieving appropriate lighting properties.

[0015] Further characteristic features of the glass composite include: In the plan view, the area of ​​the second metal thin portion is 0.03 cm 2 That's all there is to it.

[0016] The inventors have determined that the area of ​​the second metal thin section is 0.03 cm 2 It has been confirmed that if the thickness is less than this, it is difficult to obtain sufficient light transmission throughout the glass laminate, even if the number of second thin metal portions is increased to the extent that the light-reflecting layer can be maintained as a thin metal film.

[0017] Furthermore, the infrared radiation glass layer and the rear surface glass layer are It is preferable that the glass is made of at least one of alkali-free glass, soda-lime glass, alkali borosilicate glass, and acrylic resin glass.

[0018] By selecting the material in this way, the infrared-emitting glass layer or the backside glass layer can function well as an infrared-emitting layer that emits infrared rays. Furthermore, when connecting with the above-mentioned intermediate resin, hydroxyl groups in the infrared-emitting glass layer or the backside glass layer can be bonded to hydroxyl groups in the intermediate resin, thereby achieving good adhesion.

[0019] Further characteristic features of the glass composite include: In the plan view, the ratio of the area of ​​the thin portion to the entire area of ​​the light reflecting layer is 1% or more and 50% or less.

[0020] According to the above characteristic configuration, a glass composite having an overall surface average solar reflectance of 40% or more can be successfully realized.

[0021] Further characteristic features of the glass composite include: The infrared radiation glass layer has a light control layer having a light control function on the side opposite to the side where the first radiation surface is present.

[0022] As explained above, the glass composite of the present invention has an overall surface average solar reflectance of 40% or more by providing thin sections in the light-reflecting layer, so it is expected that in some cases, the amount of light passing through the gas composite may be too great. As described above, by providing a light-controlling layer having a light-controlling function on the side of the infrared radiation glass layer opposite to the side on which the light-reflecting layer is present, it is possible to adjust the light transmission properties by increasing the amount of light attenuation by the light-controlling layer, for example, when the amount of light passing through the glass composite is too large. [Brief explanation of the drawings]

[0023] [Figure 1] 1A and 1B are schematic cross-sectional views of a glass composite and a vehicle as a structure including the glass composite; [Figure 2] 10A and 10B are diagrams for explaining the sequential sputtering of materials for a light-reflecting layer onto an infrared radiation glass. [Figure 3] 1 is an example of a plan view of a glass composite (or a light-reflecting layer). [Figure 4] FIG. 10 is a diagram showing a schematic cross-sectional configuration of another embodiment of a glass composite. [Figure 5] FIG. 2 is a diagram showing a schematic cross-sectional configuration of a glass composite according to a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0024] The glass composite W according to the embodiment of the present invention can improve electromagnetic wave transparency and lighting properties, and can also reduce glare at night and other times. Hereinafter, an embodiment of the glass composite W will be described with reference to the drawings.

[0025] As shown in Fig. 1 , the glass composite W is preferably provided, for example, as window glass fitted into a frame C1 of a vehicle C, which serves as a structure that separates an internal space IS from an external environment OS. The window may be a front window, rear window, side window, sunroof, or the like of the vehicle C. Other examples of structures include commercial buildings and residential buildings, and the glass composite W can be suitably used as window glass for these. In this embodiment, the side of the atmosphere from which infrared rays are radiated is the side indicated by the arrow in the stacking direction Z.

[0026] The glass composite W has an infrared-emitting glass layer G1 that emits infrared light from a first emission surface H1, which is the emission surface H, and a back surface glass layer G2 that is provided facing the surface of the infrared-emitting glass layer G1 opposite to the side on which the first emission surface H1 is present, and has a light-reflecting layer B that reflects light between the infrared-emitting glass layer G1 and the back surface glass layer G2. Here, the back surface glass layer G2 can be an infrared-emitting back surface glass layer that emits infrared light from a second emission surface H2, which is the emission surface H, on the side opposite to the side on which the light-reflecting layer B is present. 1, the light reflecting layer B has a thick portion B3 in the stacking direction Z and a thin portion B2 whose thickness in the stacking direction Z is 2 / 3 or less of the thickness of the thick portion B3. In the thin portion B2, the proportion of transmitted light Lt in the incident light L from the first radiation surface H1 side is relatively high, and the proportion of reflected light Lr is relatively low, compared to the thick portion B3.

[0027] Regarding the thinned portion of the light reflecting layer B, as shown in the plan view of the light reflecting layer B (or the glass composite W) in FIG. 3, the thinned portion is provided continuously and integrally in a plan view perpendicular to the first radiation surface H1 and has an area of ​​5 cm2 in a plan view. 2 The metal thin portion has a first thin metal portion B1 having the above area, and a second thin metal portion B2 that is provided integrally and continuously in a plan view and has an area in a plan view less than the area of ​​the first thin metal portion B1. Here, the second thin metal portions B2 are provided in a form that is dispersed and distributed in a plan view, and the area of ​​one second thin metal portion B2 is 0.03 cm 2 That's all.

[0028] The light-reflecting layer B is preferably a metal-deposited layer deposited on the side of the infrared-emitting glass layer G1 opposite to the side where the first radiation surface H1 is present, and the deposited metal is preferably at least one of silver, a silver alloy, aluminum, an aluminum alloy, and a copper alloy.

[0029] Furthermore, with regard to the light-reflecting layer B, the thickness of each of the first thin metal portion B1 and the second thin metal portion B2 in the stacking direction Z is preferably 0 nm or more and 50 nm or less, more preferably 0 nm or more and 10 nm or less. Incidentally, the thickness of the thick portion B3 is preferably 50 nm or more and 500 nm or less, more preferably 70 nm or more and 200 nm or less. With the above configuration, the first thin metal portion B1 can effectively transmit electromagnetic waves for communication (e.g., electromagnetic waves with frequencies of approximately 300 MHz or more and 300 GHz or less), and the second thin metal portion B2 can effectively transmit visible light for lighting. Furthermore, glare can be reduced, especially at night.

[0030] In plan view, the ratio of the area of ​​the thin portions to the entire area of ​​the light reflecting layer B is preferably 1% or more and 50% or less. From the viewpoint of light transmission, the ratio of the area of ​​the second metal thin portions B2 to the entire area of ​​the light reflecting layer B is preferably 1% or more. In the plan view of FIG. 3, the first thin metal portion B1 is rectangular and the second thin metal portion B2 is circular, but they are not limited to this and may be various shapes such as oval or polygonal.

[0031] As shown in FIG. 2, the light reflecting layer B is formed by sputtering (depositing a metal material as the light reflecting layer B on a predetermined resin film Bj (an example of a resin material) via a punching metal PM (by physical vapor deposition (PVD)).

[0032] The method for forming the light reflecting layer B is not particularly limited, and may be a chemical vapor deposition (CVD) method, a plasma enhanced chemical vapor deposition (PECVD) method, magnetron sputtering, an ion beam assisted deposition method, or the like. The infrared emitting layer J may be formed by the same method as that for the light reflecting layer B or by a different method, and may be formed by spray coating, dip coating, or plasma enhanced chemical vapor deposition (PECVD).

[0033] As shown in Fig. 2, the punched metal PM preferably has a configuration in which a first flat plate portion PM1 overlapping a first thin-metal portion B1 (shown in Fig. 3) in a plan view and a second flat plate portion PM2 overlapping a second thin-metal portion B2 (shown in Fig. 3) are integrally connected to a metal frame PM4. Note that, although a plurality of second flat plate portions PM2 are dispersed in a plan view, the plurality of second flat plate portions PM2 are connected to the metal frame PM4 by, for example, connection lines PM3 that are sufficiently thin in a plan view.

[0034] Although details will be described later, the glass composite W shown in Fig. 1 is manufactured by interposing an intermediate resin Tu (described later) between the resin film Bj on which the above-mentioned metal material is sputtered and the infrared radiation glass layer G1, and between the resin film Bj on which the above-mentioned metal material is sputtered and the back glass layer G2, and then applying a predetermined pressure bonding technique to melt the intermediate resin Tu and the resin film Bj. Note that the resin film Bj is not shown in Fig. 1.

[0035] Here, the intermediate resin Tu can be preferably made of any one of polyvinyl butyral, polyethylene vinyl acetate, and polyurethane. The resin film Bj can be made of the same resin as the intermediate resin Tu, or polyethylene terephthalate can be preferably used. With this configuration, the infrared radiation glass layer G1 and the rear surface glass layer G2 (infrared radiation rear surface glass layer) can maintain the glass fragments when they are broken by impact.

[0036] The infrared radiation glass layer G1 and the back surface glass layer G2 (infrared radiation back surface glass layer) are preferably glass for vehicles, and more preferably made of at least one of alkali-free glass, soda-lime glass, alkali borosilicate glass, and acrylic resin glass. The infrared radiation glass layer G1 and the back surface glass layer G2 (infrared radiation back surface glass layer) may be made of the same material or different materials. The infrared radiation glass layer G1 and the rear surface glass layer G2 (infrared radiation rear surface glass layer) may be configured as tempered glass, and a single layer glass treated by heat treatment or chemical treatment can be suitably used, and the strength can be increased compared to ordinary glass (i.e., untempered glass such as soda-lime silica glass or annealed glass). Furthermore, the infrared-emitting glass layer G1 and the rear glass layer G2 (infrared-emitting rear glass layer) may be reinforced with fillers and / or fibers. The infrared radiation glass layer G1, the rear surface glass layer G2 (infrared radiation rear surface glass layer), and the intermediate resin Tu are preferably transparent to visible light.

[0037] As an example of a method for manufacturing the glass composite W shown in FIG. 1, first, a laminate state is formed in which an intermediate resin Tu is interposed between the resin film Bj on which the above-mentioned metal material is sputtered and the infrared radiation glass layer G1, and between the resin film Bj on which the above-mentioned metal material is sputtered and the back surface glass layer G2. Next, the glass composite W is temporarily compressed by a method such as a nipper roll method in which the laminated glass composite W is heated by heating it to about 70 to 100°C, then sandwiched between rollers and temporarily compressed while removing the air; a rubber channel method in which the ends (four sides) of the glass composite W in a plan view are tied with rubber tubing, the air is removed, and temporarily compressed; or a rubber bag method in which the glass composite W is placed in a rubber bag, the inside of the rubber bag is evacuated, and temporarily compressed. Finally, the final pressure bonding is carried out by an autoclave method, for example, at about 100 to 130° C. for about 1 to 2 hours under pressure to remove all air and to perform pressure bonding. Furthermore, when the intermediate resin Tu is heated during the pressing process, it flows into the area where the thin portion B2 of the light-reflecting layer B exists, and if the thickness of the thin portion B2 is 0 μm, it directly connects the infrared radiation glass layer G1 and the back surface glass layer G2.

[0038] As another configuration of the glass composite W, as shown in FIG. 4, a structure in which an infrared emitting glass layer G1, a light reflecting layer B, an intermediate resin Tu, and a back surface glass layer G2 are laminated from the side of the first emitting surface H1 as the emitting surface H may be used. The light-reflecting layer B is formed, for example, by spraying ceramics having a predetermined color (e.g., white) onto the surface of the infrared-emitting glass layer G1 opposite to the side where the first emission surface H1 is present, using screen printing or the like, and then baking it to solidify and adhere it. That is, the light-reflecting layer B is a ceramic layer formed on the surface of the ceramics of the infrared-emitting glass layer G1. Titanium oxide, magnesium oxide, etc. can be suitably used as the ceramic. The light-reflecting layer B has a thick portion B3 and thin portions B1 and B2, similar to the glass composite W shown in FIG. 1 or 2. The glass composite W is manufactured by carrying out the above-mentioned pre-press bonding and final press bonding with an intermediate resin Tu interposed between the infrared radiation glass layer G1 to which the light-reflecting layer B is fixed and the back surface glass layer G2. In both the glass composite W shown in FIG. 1 and the glass composite W shown in FIG. 4, the rear glass layer G2 can be used as the air side (the side indicated by the arrow Z).

[0039] From the viewpoint of exhibiting the above-mentioned infrared radiation performance, in the glass composite W shown in Fig. 1, the thickness of the infrared radiation glass layer G1 is preferably 200 µm or more and 10,000 µm or less, and in the glass composite W shown in Fig. 4, the thickness of the infrared radiation glass layer G1 is preferably 200 µm or more and 10,000 µm or less. In addition, in the glass composite W in which the back surface glass layer G2 faces the atmosphere (the side indicated by the arrow Z), the thickness of the back surface glass layer G2 is preferably 200 µm or more and 10,000 µm or less, and in the glass composite W shown in Fig. 4, the thickness of the back surface glass layer G2 is preferably 200 µm or more and 10,000 µm or less.

[0040] The glass composite W described so far has an overall surface average solar reflectance of 40% or more, and an average surface emissivity, which is the wavelength average of the emissivity of infrared light in the wavelength range of 8 μm to 13 μm, of 80% or more. More preferably, the overall surface average solar reflectance is 60% or more, and the surface average average emissivity, which is the wavelength average of the emissivity of infrared light of 8 μm or more and 13 μm or less, is 85% or more.

[0041] [Test results] With regard to the glass composite W described above, those having the structure shown in Fig. 1 were designated as Examples 1, 2, and 4, and those having the structure shown in Fig. 4 were designated as Examples 3 and 5. Furthermore, as shown in Fig. 5, a structure in which an infrared emitting glass layer G, a light reflective layer B, and an infrared emitting layer J were laminated in this order from the air side was designated as Comparative Example 1, and an infrared emitting glass layer alone was designated as Comparative Example 2.

[0042] The conditions for the glass composite W tested in the examples and comparative examples are as shown in Table 2 below. The test results are shown in Table 1.

[0043] [Table 1]

[0044] [Table 2]

[0045] The above test results show that the glass composites W according to Examples 1 to 5 provide good results in terms of emissivity, visible light reflectance, radio wave transmittance, lighting properties, and glare resistance. On the other hand, in the glass composite W of Comparative Example 1, since the light-reflecting layer B does not have a thin portion, it is presumed that the test conditions for radio wave transmittance, lighting, and anti-reflection properties are not met. Furthermore, it is presumed that the glass composite W according to Comparative Example 2 does not satisfy the test conditions for visible light reflectance because it is configured without the light reflecting layer B.

[0046] [Another embodiment] (1) The glass composite W described above may have a light control layer (not shown) having a light control function on the side of the infrared radiation glass layer G1 opposite to the side where the first radiation surface H1 is present.

[0047] (2) The glass composite W described above may have a configuration in which an ultraviolet reflective layer that reflects ultraviolet rays is provided along the radiating surface H. In the case of the glass composite W, the ultraviolet reflective layer can be suitably made of a material such as an aluminum alloy.

[0048] Furthermore, the configurations disclosed in the above embodiments (including other embodiments, the same applies below) can be applied in combination with configurations disclosed in other embodiments, as long as no contradictions arise. Furthermore, the embodiments disclosed in this specification are examples, and the embodiments of the present invention are not limited to these, and can be modified as appropriate within the scope that does not deviate from the purpose of the present invention. [Industrial Applicability]

[0049] The glass composite of the present invention can be effectively used as a glass composite that can improve electromagnetic wave transmittance and daylighting properties and can also reduce glare at night, etc. [Explanation of symbols]

[0050] 2: Thin wall part B: Light reflective layer B1: 1st metal thin section B2: 2nd metal thin section B3:Thick part G1: Infrared radiation glass layer G2: Rear glass layer H: Radiation surface H1: 1st radiation surface H2: Second radiation surface J: Infrared radiation layer Tu: Intermediate resin W: Glass composite Z:Lamination direction

Claims

1. an infrared radiation glass layer that emits infrared light from a first radiation surface that is a radiation surface; and a back surface glass layer that is provided opposite to a surface of the infrared radiation glass layer opposite to a side on which the first radiation surface is present, a light-reflecting layer that reflects light is provided between the infrared radiation glass layer and the rear surface glass layer; the light reflecting layer has a thick portion in a stacking direction and a thin portion whose thickness in the stacking direction is 2 / 3 or less of the thickness of the thick portion, The thin portion is provided continuously and integrally in a plan view perpendicular to the first radiation surface and has an area of ​​5 cm ２ a first thin metal portion having an area equal to or greater than the area of ​​the first thin metal portion, and a second thin metal portion provided integrally and continuously in the plan view and having an area in the plan view less than the area of ​​the first thin metal portion, the second thin metal portion is provided in a plurality of portions in a dispersed and distributed manner in the plan view, A glass composite having an overall surface average solar reflectance of 40% or more and a surface average average emissivity, which is the wavelength average of the emissivity of infrared light of 8 μm or more and 13 μm or less, of 80% or more.

2. the light-reflecting layer is a metal-deposited layer formed by depositing a metal on a resin material, the metal is at least one of silver, a silver alloy, aluminum, an aluminum alloy, and a copper alloy; 2. The glass composite according to claim 1, wherein the intermediate resin bonding between the infrared radiation glass layer and the metal vapor deposition layer and between the rear glass layer and the metal vapor deposition layer is made of one of polyvinyl butyral, polyethylene vinyl acetate, and polyurethane.

3. the light-reflecting layer is a ceramic layer formed on the surface of the infrared radiation glass layer, 2. The glass composite according to claim 1, wherein the intermediate resin that bonds the light-reflecting layer and the rear glass layer is made of one of polyvinyl butyral, polyethylene vinyl acetate, and polyurethane.

4. 3. The glass composite according to claim 1, wherein the thickness of each of the first thin metal portion and the second thin metal portion in the stacking direction is 0 nm or more and 50 nm or less.

5. 3. The glass composite according to claim 1, wherein the thickness of each of the first thin metal portion and the second thin metal portion in the stacking direction is 0 nm or more and 10 nm or less.

6. In the plan view, the area of ​​the second thin metal portion is 0.03 cm ２ 3. The glass composite according to claim 1 or 2, wherein

7. The infrared radiation glass layer and the rear surface glass layer are 3. The glass composite according to claim 1, which comprises at least one of alkali-free glass, soda-lime glass, alkali borosilicate glass, and acrylic resin glass.

8. 3. The glass composite according to claim 1, wherein a ratio of an area of ​​the thin portion to an entire area of ​​the light reflecting layer in the plan view is 1% or more and 50% or less.

9. The glass composite according to claim 1 or 2, further comprising a light control layer having a light control function on the side of the infrared radiation glass layer opposite to the side on which the first radiation surface is present.

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