Radiant cooling glazing unit for mobility device and mobility device including same

Abstract

The present invention relates to a radiant cooling glazing unit for a mobility device, comprising: a first transparent base layer; a first light reflective layer formed on the first transparent base layer and having a reflectance of 80% or more with respect to light having a wavelength of 780 nm to 1,300 nm and a transmittance of 70% or more with respect to visible light having a wavelength of 400 nm to 780 nm; a second light reflective layer formed on the first reflective layer and in which a first metal protection layer, a metal layer, and a second metal protection layer are sequentially laminated; and a second transparent base layer formed on the second light reflective layer.

Description

Radiant cooling glazing unit for mobility and mobility including the same

[0001] The present invention relates to a radiant cooling glazing unit for mobility having excellent reflectivity for light in the ultraviolet and near-infrared regions and excellent long-infrared radiation, thereby providing an excellent radiant cooling effect, and to a mobility including the same.

[0002] [Cross-reference with related applications]

[0003] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0179087, filed December 11, 2023, the entire contents of which are incorporated herein by reference.

[0004] Cooling generally requires energy consumption. For example, general-purpose cooling devices such as refrigerators and air conditioners use energy to compress a refrigerant and then perform cooling by absorbing the heat generated when the compressed refrigerant expands. However, radiant cooling is a technology that can cool without consuming energy, unlike general-purpose cooling devices. To improve the efficiency of radiant cooling, it is important to properly control the absorptivity, reflectivity, and emissivity of light in each wavelength range. Most heat is generated from incident sunlight, which is divided into ultraviolet (UV), visible light, and infrared light. Reflecting light in each wavelength range can block the inflow of heat through sunlight. For example, on a sunny day, a black car that absorbs light well easily experiences an increase in interior temperature, whereas a white car that reflects light well rather than absorbing it experiences a relatively slower increase in interior temperature.

[0005] Various materials are used as materials for radiant cooling, including multilayer thin films made of polymers, inorganic materials, or ceramic materials, radiant cooling components including metal reflective layers, and paints including white pigments. The polymer materials generally have high absorption rates (emissivities) for infrared rays, but due to their material characteristics, they are easily degraded by ultraviolet rays, moisture, etc. when left outdoors, which has the disadvantage of a short lifespan. In the case of the multilayer thin films, in order to increase the emissivity for infrared rays, the number of layers must be increased, which has the limitation that it is difficult to achieve high-efficiency radiant cooling performance due to the increased solar absorption rate. In addition, materials including metal reflective layers are difficult to apply in real life due to the problem of low long-term stability due to oxidation of the metal and the unit price. In addition, such metal materials have problems of causing eye fatigue and light scattering because they reflect specularly. Paints including white pigments are not typically composed of materials with high extinction coefficients, so they have problems of insufficient infrared emissivity and ultraviolet reflectivity, resulting in insufficient radiant cooling performance.

[0006] As an alternative to these problems, Korean Patent Publication No. 2019-0072514 (Patent Document 1) discloses an infrared shielding sheet comprising a laminated film in which high-refractive index resin layers containing fine particles and low-refractive index resin layers containing fine particles are alternately laminated, and an infrared-absorbing pigment layer with a visible light transmittance of 70% or more. However, the sheet of Patent Document 1 had poor cooling performance and limited color expression.

[0007] Therefore, there is a need for research and development on materials that have excellent reflectivity for light in the ultraviolet and near-infrared regions and excellent long-infrared radiation, thereby providing excellent radiative cooling capabilities.

[0008] Accordingly, the present invention provides a material having excellent reflectivity for light in the ultraviolet and near-infrared regions, excellent long-infrared radiation, excellent radiative cooling ability, and excellent durability, applicable to outdoor use exposed to sunlight for long periods of time, and a mobility including the same.

[0009] The present invention comprises a first transparent substrate layer;

[0010] A first light reflective layer formed on the first transparent substrate layer, having a reflectivity of 80% or more for light having a wavelength of 780 to 1,300 nm and a transmittance of 70% or more for visible light having a wavelength of 400 to 780 nm;

[0011] A second light-reflecting layer formed on the first light-reflecting layer, in which a first metal protective layer, a metal layer, and a second metal protective layer are sequentially laminated; and

[0012] A mobility-use radiation cooling glazing unit is provided, comprising a second transparent substrate layer formed on the second light-reflecting layer.

[0013] In addition, the present invention provides a mobility comprising the glazing unit.

[0014] The radiant cooling glazing unit for mobility according to the present invention has excellent reflectivity for light in the ultraviolet and near-infrared ranges and excellent long-infrared radiation, thereby exhibiting excellent radiant cooling performance. In addition, the radiant cooling glazing unit for mobility has excellent durability and wear resistance against sunlight, making it highly suitable as a radiant cooling material for outdoor use, such as the exterior of a mobility vehicle, where it is exposed to sunlight for extended periods of time.

[0015] Figures 1 and 2 are cross-sectional views of a mobility-use radiant cooling glazing unit according to one embodiment of the present invention.

[0016] Figure 3 shows the results of a durability evaluation evaluated in an embodiment of the present invention.

[0017] In this specification, when a part is said to "include" a certain component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0018] In this specification, when it is said that a member is located on the “surface”, “top”, “one side”, “other side” or “both sides” of another member, this includes not only cases where a member is in contact with another member, but also cases where another member exists between the two members.

[0019] In addition, in the present specification, “weight average molecular weight” can be measured by a method well known in the art, and can represent a value measured by, for example, a GPC (gel permeation chromatograph) method.

[0020] Radiant cooling glazing unit for mobility

[0021] A mobility-use radiation cooling glazing unit according to the present invention comprises: a first transparent substrate layer; a first light-reflecting layer formed on the first transparent substrate layer; a second light-reflecting layer formed on the first light-reflecting layer; and a second transparent substrate layer formed on the second light-reflecting layer.

[0022] Referring to FIG. 1, a mobility-use radiation cooling glazing unit (A) according to the present invention may include a form in which a first transparent substrate layer (100); a first light-reflecting layer (200); a second light-reflecting layer (300); and a second transparent substrate layer (400) are sequentially laminated. At this time, the second light-reflecting layer (300) may include a form in which a first metal protective layer (310), a metal layer (320), and a second metal protective layer (330) are sequentially laminated. In addition, the first light-reflecting layer (200) may include a form in which a first layer (210) and a second layer (220) are alternately laminated.

[0023] First transparent substrate layer and second transparent substrate layer

[0024] Each of the first transparent substrate layer and the second transparent substrate layer independently absorbs heat of a long infrared wavelength generated within the interior of the mobility to which the glazing unit is applied. In this case, the long infrared wavelength may have a wide range of wavelengths ranging from 2 to 25 μm.

[0025] In addition, the first transparent substrate layer and the second transparent substrate layer may be used without any special restrictions as long as they are transparent materials that can be independently applied for construction or mobility purposes, and may include, for example, at least one selected from the group consisting of glass and polycarbonate resins. In this case, the glass may be used without any special restrictions as long as it is commonly available for purchase or acquisition, such as soda lime glass.

[0026] The first transparent substrate layer and the second transparent substrate layer may each independently have an appropriate thickness depending on the intended use. For example, the first transparent substrate layer and the second transparent substrate layer may each independently have an average thickness of 1.0 to 5.0 mm, or 1.0 to 2.6 mm. If the average thickness of the first transparent substrate layer and the second transparent substrate layer is less than the above range, there may be a problem that the manufactured glazing unit is damaged by external impact and / or the long infrared absorption rate is reduced, and if it exceeds the above range, the weight of the manufactured glazing unit may increase, which may cause a problem that the fuel efficiency of the mobility including the same is reduced.

[0027]

[0028] First light reflecting layer

[0029] The first light-reflecting layer reflects near-infrared rays with a wavelength of 780 to 1,300 nm to block heat.

[0030] The first light reflective layer has a reflectivity of 80% or more for light having a wavelength of 780 to 1,300 nm, and a transmittance of 70% or more for visible light having a wavelength of 400 to 780 nm. Specifically, the first light reflective layer may have a high reflectivity of 80 to 90% for near-infrared light having a wavelength of 780 to 1,300 nm, and a transmittance of 75% or more or 80 to 95% for visible light having a wavelength of 400 to 780 nm. Accordingly, the first light reflective layer has the effect of improving radiant cooling capacity by reflecting near-infrared light irradiated to the glazing unit.

[0031] In addition, it is preferable that the first light reflecting layer is a polymer-containing layer rather than a metal-containing structure in consideration of economic feasibility. Specifically, the first light reflecting layer may include a first polymer-containing first layer and a second polymer-containing second layer having a lower refractive index than the first layer, which are alternately laminated. When the first light reflecting layer includes a first layer and a second layer having a lower refractive index than the first layer, which are alternately laminated, the first layer having a relatively high refractive index and the second layer having a relatively low refractive index are alternately laminated, so that each layer generates an interference effect with each other to change the direction of light propagation, thereby effectively blocking heat.

[0032] In addition, the first layer may have a refractive index of 1.4 or more, 1.6 to 2.2, or 1.8 to 2.0. When the refractive index of the first layer is within the above range, the first layer and the second layer generate an interference effect with each other to change the direction of light propagation, thereby improving the radiative cooling capacity of the glazing unit.

[0033] The second layer may have a refractive index of 1.3 or more, 1.5 to less than 2.1, or 1.7 to less than 1.9. When the refractive index of the second layer is within the above range, the first layer and the second layer generate an interference effect with each other to change the direction of light propagation, thereby improving the radiant cooling capacity of the glazing unit.

[0034] The above first light reflecting layer may have an average thickness of 50 to 300 μm, 60 to 270 μm, or 75 to 250 μm. If the average thickness of the first light reflecting layer is less than the above range, the manufactured glazing unit may have problems such as insufficient hardness or reduced near-infrared reflectance, and if it exceeds the above range, the manufactured glazing unit may have problems such as increased reflectance at undesired wavelengths, decreased visible light transmittance, and reduced obtainable effects relative to the thickness, resulting in reduced economic feasibility.

[0035]

[0036] Second light reflective layer

[0037] The second light-reflecting layer reflects infrared rays with a wavelength of 1,300 to 2,500 nm to block heat and improve the durability of the glazing unit against sunlight.

[0038] The second light reflective layer is formed on the first light reflective layer, and includes a first metal protective layer, a metal layer, and a second metal protective layer sequentially laminated. The second light reflective layer includes a first metal protective layer, a metal layer, and a second metal protective layer sequentially laminated, thereby improving the reflectivity for infrared rays having a wavelength of 1,300 nm or more, thereby having the effect of improving the radiation cooling performance of the manufactured glazing unit.

[0039] The first metal protective layer and the second metal protective layer may each independently include at least one selected from the group consisting of indium-doped tin oxide (ITO), aluminum-doped zinc oxide (AZO), fluorine-dopped tin oxide (FTO), titanium dioxide (TiO2), neodymium oxide (Nd2O3), and silicon dioxide (SiO2). When each of the first metal protective layer and the second metal protective layer includes the metal oxides described above, the problem of the metal layer being exposed to the air and being oxidized is prevented, and the visible light transmittance of the glazing unit is controlled.

[0040] In addition, the first metal protective layer and the second metal protective layer may each independently have an average thickness of 15 to 200 nm, 50 to 150 nm, or 30 to 100 nm. If the average thickness of each of the first metal protective layer and the second metal protective layer is less than the above range, the durability of the manufactured glazing unit may be lowered due to metal dissolution in the metal layer by external impact, or the metal layer may react with air and easily oxidize, resulting in a problem of lowering the durability of the metal layer and a problem of lowering the visible light transmittance. If the average thickness exceeds the above range, the visible light transmittance of the manufactured glazing unit may be lowered or the near-infrared reflectance may excessively increase.

[0041] The above metal layer may include, for example, at least one selected from the group consisting of silver (Ag), aluminum (Al), gold (Au), aluminum oxide (Al2O3), chromium (Cr), and copper (Cu). When the metal layer includes at least one of the metals described above, there is an effect of increasing the infrared reflectance of the glazing unit due to interference of light.

[0042] In addition, the metal layer may have an average thickness of 1 to 100 nm, 1 to 50 nm, 1 to 30 nm, or 1 to 20 nm. If the average thickness of the metal layer is less than the above range, a problem of insufficient near-infrared reflectance of the manufactured glazing unit may occur, and if it exceeds the above range, a problem of low economic feasibility may occur due to a small obtainable effect compared to the thickness of the metal layer.

[0043] The second light-reflecting layer may have an average thickness of 30 to 300 nm, 50 to 200 nm, or 50 to 150 nm. If the average thickness of the second light-reflecting layer is less than the above range, the problem of insufficient near-infrared reflectance and visible light transmittance of the manufactured glazing unit may occur, and if it exceeds the above range, the obtainable effect may be small compared to the thickness of the second light-reflecting layer, resulting in a problem of poor economic feasibility.

[0044]

[0045] For example, the glazing unit may include a structure in which a first transparent substrate layer, a first adhesive layer, a first light-reflecting layer, a second light-reflecting layer, a second adhesive layer, and a second transparent substrate layer are sequentially laminated.

[0046] Referring to FIG. 2, the glazing unit (A) according to the present invention may include a form in which a first transparent substrate layer (100), a first adhesive layer (20), a first light-reflecting layer (200), a second light-reflecting layer (300), a second adhesive layer (30), and a second transparent substrate layer (400) are sequentially laminated.

[0047] At this time, the first transparent substrate layer (10) of the glazing unit (A) may be an inner glass, and the second transparent substrate layer (400) may be an outer glass. That is, the first transparent substrate layer (10) of the glazing unit (A) may be arranged on the inside of the mobility. As a result, the glazing unit may absorb heat inside the mobility, which is the lower part of the first light reflecting layer, and release it to the outside, thereby further improving the radiation cooling effect.

[0048] First adhesive layer and second adhesive layer

[0049] The first adhesive layer serves to bond the first transparent substrate layer and the first light-reflecting layer, and the second adhesive layer serves to bond the second light-reflecting layer and the second transparent substrate layer.

[0050] The first adhesive layer and the second adhesive layer may each independently include at least one selected from the group consisting of a polyvinyl butyral (PVB) adhesive, an ethylene-vinyl acetate (EVA) adhesive, and a polyurethane (TPU) adhesive.

[0051] In addition, the first adhesive layer and the second adhesive layer may each independently have an average thickness of 0.2 to 1.5 mm, 0.2 to 1.0 mm, 0.3 to 0.8 mm, or 0.4 to 0.8 mm. When the average thickness of the first adhesive layer and / or the second adhesive layer is less than the above range, the bonding strength between the transparent substrate layer and the light reflective layer may be insufficient, resulting in peeling, or the adhesive layer may be easily destroyed due to its thin thickness during the bonding process, making it difficult to handle, thus increasing the process time, or the adhesive layer may become vulnerable to external impact after bonding. In addition, when the average thickness of the first adhesive layer and / or the second adhesive layer exceeds the above range, the hardness of the adhesive layer may be high, requiring an additional process to lower the hardness during the bonding process, or the weight of the manufactured glazing unit may increase due to the thickness of the adhesive layer, thereby increasing the fuel efficiency of mobility, resulting in a problem of insufficient economy.

[0052] Specifically, the first adhesive layer may have an average thickness of 0.2 to 1.0 mm or 0.3 to 0.8 mm, and the second adhesive layer may have an average thickness of 0.3 to 1.5 mm or 0.4 to 0.8 mm. When the average thicknesses of the first and second adhesive layers are within the above ranges, the light reflective layer and the transparent substrate layer can be effectively bonded with the thinnest possible thickness, and the economic efficiency of the manufactured glazing unit is also increased.

[0053]

[0054] dye coating layer

[0055] In addition, the glazing unit may further include a dye coating layer on one surface of each of the first transparent substrate layer and the second transparent substrate layer. Specifically, the glazing unit may include a structure in which a first dye coating layer, a first transparent substrate layer, a first light-reflecting layer, a second light-reflecting layer, a second transparent substrate layer, and a second dye coating layer are sequentially laminated.

[0056] For example, the dye coating layer may be formed on the back surface of the surface where the first transparent substrate layer contacts the first adhesive layer, and the second transparent substrate layer may be formed on the back surface of the surface where the second adhesive layer contacts the second adhesive layer. Specifically, the glazing unit may include a structure in which a first dye coating layer, a first transparent substrate layer, a first adhesive layer, a first light-reflecting layer, a second light-reflecting layer, a second adhesive layer, a second transparent substrate layer, and a second dye coating layer are sequentially laminated.

[0057] Additionally, the dye coating layer may include, without particular limitation, a dye that can be typically applied to glass, and may include, for example, organic and / or inorganic dyes such as black and green.

[0058]

[0059] The glazing unit may have a reflectivity of 70% or more for light having a wavelength of 800 to 1,000 nm. Specifically, the glazing unit may have a reflectivity of 75% or more or 80% or more for light having a wavelength of 800 to 1,000 nm.

[0060] Additionally, the glazing unit may have an emissivity of 70% or more for light having a wavelength of 5 to 20 μm. Specifically, the glazing unit may have an emissivity of 80% or more or 90% or more for light having a wavelength of 5 to 20 μm.

[0061] The above glazing unit may have an average thickness of 2.5 to 20 mm, 2.5 to 10 mm, or 2.5 to 7 mm. When the average thickness of the glazing unit is within the above range, excellent cooling performance is achieved. In addition, the glazing unit may be manufactured using a roll-to-roll process to manufacture the average thickness within the above range.

[0062] Additionally, the glazing unit may be applied as a material for the exterior of a vehicle or building. The vehicle may include, for example, an automobile, an aircraft, a train, a ship, or various mobile robots. Furthermore, the building may be mobile or stationary.

[0063] The radiant cooling glazing unit for mobility according to the present invention, as described above, exhibits excellent reflectivity for light in the ultraviolet and near-infrared ranges and excellent long-infrared radiation, resulting in an excellent radiant cooling effect. Furthermore, the glazing unit exhibits excellent durability and wear resistance against sunlight, making it highly suitable as a radiant cooling material for outdoor applications such as the exterior of mobility vehicles that are exposed to sunlight for extended periods of time.

[0064]

[0065] Mobility

[0066] The mobility of the present invention includes the glazing unit. As a result, the mobility is capable of saving cooling energy during summer or periods of intense sunlight, resulting in excellent energy efficiency.

[0067] At this time, the mobility may include, for example, automobiles, airplanes, trains, ships, or various mobile robots.

[0068] Specifically, the above mobility may include a windshield or sunroof including the glazing unit.

[0069] Hereinafter, the present invention will be described in more detail through examples. However, these examples are provided solely to aid understanding of the present invention and are not intended to limit the scope of the present invention in any way.

[0070] Manufacturing Example 1. Manufacturing of laminate-1

[0071] As the first light-reflecting layer, a first light-reflecting layer with an average thickness of 75 ㎛ (transmittance for visible light (wavelength 400-780 nm): 88%, reflectance for near-infrared light (wavelength 780-1300 nm): 80%) (Manufacturer: Toray Film, Product name: PICASUS, high-refractive index layers and low-refractive index layers alternately laminated, each layer made of polymer) was used.

[0072] On the first light reflecting layer, a first metal protective layer was formed with an average thickness of 0.065 μm (65 nm) by a deposition method using an indium-doped tin oxide (ITO) target under an argon atmosphere, and a metal layer was formed with an average thickness of 0.01 μm (10 nm) on the first metal protective layer by a metal deposition method using an Ag Planar target under an argon atmosphere, and a second metal protective layer with an average thickness of 0.065 μm (65 nm) was formed on the metal layer using ITO in the same manner as the formation of the first metal protective layer, thereby manufacturing a laminate-1.

[0073]

[0074] Test Example 1: Durability Evaluation

[0075] The durability of laminate-1 of Manufacturing Example 1 was evaluated by the following method.

[0076] Specifically, using ATLAS Ci5000 (Xenon Weatherometer) equipment, light was irradiated on the first light-reflecting layer or the second light-reflecting layer of the laminate-1 of Manufacturing Example 1 for 3 weeks at a light exposure dose of 185 mJ, and then the appearance of the laminate was observed with the naked eye. At this time, the case where light was irradiated on the first light-reflecting layer was designated as Structure 1, and the case where light was irradiated on the second light-reflecting layer was designated as Structure 2, and the durability evaluation results are shown in Fig. 3.

[0077] As shown in Fig. 3, Structure 1, in which light was irradiated onto the first light-reflecting layer, the first light-reflecting layer was degraded by the light, resulting in haze. On the other hand, Structure 2, in which light was irradiated onto the second light-reflecting layer, was found to have excellent durability against light. Therefore, Structure 2, in which the second light-reflecting layer is exposed to the outside, was found to be more suitable as a structure for a radiant cooling material.

[0078]

[0079] Example 1. Manufacturing of glazing unit-1

[0080] A polyvinyl butyral (PVB) adhesive film (manufacturer: Sekisui, product name: PVB film, average thickness: 0.76 mm) was laminated on each of the first light reflecting layer and the second metal protective layer of the laminate-1 of the above-mentioned manufacturing example 1, thereby forming a first adhesive layer and a second adhesive layer. Thereafter, transparent glass (thickness 2.1 mm, first transparent base layer and second transparent base layer) was laminated on each of the above-mentioned adhesive layers, thereby manufacturing a glazing unit-1.

[0081]

[0082] Examples 2 to 5 and Comparative Examples 1 to 4.

[0083] A glazing unit was manufactured in the same manner as in Example 1, except that the thickness and composition of each layer were adjusted as shown in Table 1.

[0084]

[0085] Color and thickness of the first transparent substrate layer Thickness of the first adhesive layer (mm) Thickness of the first light-reflecting layer (㎛) Thickness of each layer in the second light-reflecting layer (㎛) Thickness of the second adhesive layer (mm) Color and thickness of the second transparent substrate layer First metal protective layerMetal layerSecond metal protective layerExample 1 Transparent, 2.1mm0.76750.0650.010.0650.76Transparent, 2.1mmExample 2 Transparent, 2.1mm0.76750.0650.010.0650.76Transparent, 2.1mmExample 3 Transparent, 2.1mm0.72750.0650.010.0650.72Transparent, 2.1mmExample 4 Transparent, 2.1mm0.38750.0650.010.0650.38Transparent, 2.1mmExample 5Transparent, 2.1mm0.76750.0650.010.0650.76Green, 2.1mmComparative Example 1Transparent, 2.1mm0.76-0.0650.010.0650.76Transparent, 2.1mmComparative Example 2Transparent, 2.1mm0.7675---0.76Transparent, 2.1mmComparative Example 3Transparent, 2.1mm0.76750.065--0.76Transparent, 2.1mmComparative Example 4Transparent, 2.1mm0.7675-0.01-0.76Transparent, 2.1mm

[0086]

[0087] Test Example 2: Characteristic Evaluation

[0088] The properties of the glazing units of the examples and comparative examples were evaluated using the following methods, and the results are shown in Table 2.

[0089] Specifically, an integrating sphere was installed on an ultraviolet-visible spectrophotometer (UV-VIS spectrophotometer) and a Fourier transform infrared spectrometer (FT-IR), and then the reflectance, emissivity, and transmittance of the laminate of the manufacturing example for a wavelength of 0.2 to 20 ㎛ were measured, and then the average emissivity, average reflectivity, and average transmittance were calculated.

[0090] Average reflectance (%) for wavelengths 0.8 to 2.5 ㎛ Average emissivity (%) for wavelengths 4 to 20 ㎛ Average transmittance (%) for wavelengths 0.4 to 0.8 ㎛ Example 1809080 Example 2759080 Example 3839073 Example 4809080 Example 5809050 Comparative Example 1509090 Comparative Example 2509090 Comparative Example 3609080 Comparative Example 4709070

[0091]

[0092] As shown in Table 2, the glazing units of Examples 1 to 5 had excellent radiant cooling performance, with a reflectivity of 75% or higher for ultraviolet and near-infrared rays with a wavelength of 0.8 to 2.5 ㎛ and an emissivity of 90% or higher for infrared rays with a wavelength of 4 to 20 ㎛. In addition, the glazing units of Examples 1 to 5 had a transmittance of 80% or higher for visible light with a wavelength of 400 to 780 nm, and thus did not cause distortion of the field of view.

[0093] On the other hand, Comparative Example 1 not including the first light-reflecting layer, Comparative Example 2 not including the second light-reflecting layer, Comparative Example 3 including only the first metal protective layer (ITO layer) instead of the second light-reflecting layer, and Comparative Example 4 including only the metal layer (Ag layer) instead of the second light-reflecting layer all had insufficient reflectivity of 70% or less for ultraviolet and near-infrared rays with a wavelength of 0.8 to 2.5 ㎛, resulting in insufficient radiative cooling capability.

Claims

1. First transparent substrate layer; A first light reflecting layer formed on the first transparent substrate layer and having a reflectivity of 80% or more for light having a wavelength of 780 to 1,300 nm and a transmittance of 70% or more for visible light having a wavelength of 400 to 780 nm; A second light-reflecting layer formed on the first light-reflecting layer, in which a first metal protective layer, a metal layer, and a second metal protective layer are sequentially laminated; and A mobility-use radiation cooling glazing unit, comprising a second transparent substrate layer formed on the second light reflective layer.

2. In claim 1, A mobility-use radiation cooling glazing unit, wherein the first transparent substrate layer and the second transparent substrate layer each independently include at least one selected from the group consisting of glass and polycarbonate resin.

3. In claim 1, A mobility-use radiation cooling glazing unit, wherein the first light-reflecting layer includes a first layer containing a first polymer and a second layer containing a second polymer having a lower refractive index than the first layer, which are alternately laminated.

4. In claim 1, The above first light reflecting layer has an average thickness of 50 to 300 ㎛, A mobility-use radiation cooling glazing unit, wherein the second light reflecting layer has an average thickness of 30 to 300 nm.

5. In claim 1, The first metal protective layer and the second metal protective layer each independently have an average thickness of 15 to 200 nm, A radiation cooling glazing unit for mobility, wherein the metal layer has an average thickness of 1 to 100 nm.

6. In claim 1, A mobility-use radiation cooling glazing unit, wherein the first metal protective layer and the second metal protective layer each independently include at least one selected from the group consisting of indium-doped tin oxide (ITO), aluminum-dopped zinc oxide (AZO), fluorine-dopped tin oxide (FTO), titanium dioxide (TIO2), neodymium oxide (Nd2O3), and silicon dioxide (SiO2).

7. In claim 1, A mobility-use radiation cooling glazing unit, wherein the metal layer comprises at least one selected from the group consisting of silver (Ag), aluminum (Al), gold (Au), aluminum oxide (Al2O3), chromium (Cr), and copper (Cu).

8. In claim 1, A radiant cooling glazing unit for mobility, having a reflectivity of 70% or more for light having a wavelength of 800 to 1,000 nm and an emissivity of 70% or more for light having a wavelength of 5 to 20 ㎛.

9. In claim 1, A mobility-use radiation cooling glazing unit comprising a structure in which a first dye coating layer, a first transparent substrate layer, a first light-reflecting layer, a second light-reflecting layer, a second transparent substrate layer, and a second dye coating layer are sequentially laminated.

10. In claim 1, A mobility-use radiation cooling glazing unit comprising a structure in which a first transparent substrate layer, a first adhesive layer, a first light-reflecting layer, a second light-reflecting layer, a second adhesive layer, and a second transparent substrate layer are sequentially laminated.

11. In claim 10, A mobility-use radiation cooling glazing unit, wherein the first adhesive layer and the second adhesive layer each independently include at least one selected from the group consisting of a polyvinyl butyral (PVB)-based adhesive, an ethylene-vinyl acetate (EVA)-based adhesive, and a polyurethane (TPU)-based adhesive.

12. A mobility comprising a glazing unit according to any one of claims 1 to 11.

13. In claim 12, Mobility, wherein the windshield or sunroof comprises said glazing unit.

Images