Sunscreen glass and vehicle

Abstract

The invention provides sunscreen glass and a vehicle. The sunscreen glass comprises a glass substrate and a sunscreen layer arranged on the glass substrate. The sunscreen glass has the light transmittance Tuv1 for light with the wavelength ranging from 300 nm to 400 nm, and the light transmittance Tuv1 is smaller than or equal to 1%. The sunscreen glass has the light transmittance Tuv2 for light with the wavelength ranging from 380 nm to 400 nm, and the light transmittance Tuv2 is smaller than or equal to 2%. According to the sunscreen glass, the sunscreen layer is arranged on the glass substrate, so that the sunscreen glass has low light transmittance Tuv1 for light with the wavelength of 300nm-400nm and low light transmittance Tuv2 for light with the wavelength of 380nm-400nm, the sunscreen glass has a high SPU (sun protection index) value, the skin and eyes of a user are protected while heat insulation and sunscreen are realized, and the user experience is improved. Skin problems such as sunburn and light aging caused by long-term exposure of a user are reduced, and the use experience of the user is improved.

Description

Technical Field

[0001] This application belongs to the field of automotive window glass technology, specifically relating to sun-protective glass and vehicles. Background Technology

[0002] According to the energy distribution of sunlight, ultraviolet light wavelengths range from 200nm to 380nm, accounting for 3% of solar energy's heat energy; visible light wavelengths range from 380nm to 780nm, accounting for 44% of solar energy's heat energy. Since the visible light band is perceptible to the human eye, regulations require car windows to have high visible light transmittance. However, light with wavelengths between 320nm and 400nm has strong penetrating power, stimulating pigment synthesis and easily causing skin aging and fine lines. In particular, light with wavelengths between 380nm and 400nm can reach deep into the skin; long-term exposure can lead to sunspots and photoaging, and can also damage the eyes, causing cataracts and eye fatigue, thus worsening myopia. The proportion of 400nm light entering the lens is as high as 82% to 96%, posing a health hazard to users. Summary of the Invention

[0003] In view of this, the first aspect of this application provides a sun-protective glass, the sun-protective glass comprising a glass substrate and a sun-protective layer disposed on the glass substrate; The sun-protective glass has a transmittance Tuv1 for light with a wavelength of 300nm~400nm, and the transmittance Tuv1 is ≤1%. The sun-protective glass has a transmittance Tuv2 for light with a wavelength of 380nm~400nm, and the transmittance Tuv2 ≤ 2%.

[0004] Wherein, the light transmittance Tuv1 ≤ 0.8%, or Tuv1 ≤ 0.5%, or Tuv1 ≤ 0.2%, or Tuv1 ≤ 0.05%.

[0005] Wherein, the transmittance Tuv2 ≤ 1.8%, or Tuv2 ≤ 1.5%, or Tuv2 ≤ 1.2%, or Tuv2 ≤ 1%, or Tuv2 ≤ 0.08%, or Tuv2 ≤ 0.06%.

[0006] The sun-protective glass has a sun protection factor (SPU) of ≥1000, ≥1250, ≥1500, ≥1750, or ≥2000.

[0007] The sun protection layer includes a sun protection film; When the glass substrate is a single piece of glass, the sun protection film is disposed on at least one side surface of the single piece of glass; When the glass substrate is laminated glass, the laminated glass includes a first glass plate, an intermediate adhesive layer, and a second glass plate stacked in sequence, and the sun protection film is disposed on the first glass plate and / or the second glass plate.

[0008] The sunscreen film includes a first sunscreen layer, which is prepared by a sunscreen coating. The material of the sunscreen coating is selected from one or more of ultraviolet absorbers, rare earth elements, and cesium tungsten bronze.

[0009] The ultraviolet absorber is selected from at least one of benzimidazole ultraviolet absorbers, triazine ultraviolet absorbers, and benzotriazole derivative ultraviolet absorbers.

[0010] The absorption peak of the ultraviolet absorber is 315 nm to 380 nm.

[0011] The thickness of the first sun protection layer is 2μm to 12μm.

[0012] The sun protection film includes a second sun protection layer, which includes at least one of a metal layer, a metal alloy layer, and a metal oxide layer.

[0013] Wherein, when the second sun protection layer includes the metal layer, the material of the metal layer includes at least one of gold, silver, copper, aluminum, and molybdenum; And / or, when the second sun protection layer includes the metal alloy layer, the material of the metal alloy layer includes at least one of silver alloy, nickel-chromium alloy, and titanium-tungsten alloy; And / or, when the second sunscreen layer includes the metal oxide layer, the material of the metal oxide layer includes at least one of indium tin oxide, fluorine-doped tin dioxide, aluminum-doped tin dioxide, gallium-doped tin dioxide, boron-doped tin dioxide, tin-zinc oxide, antimony-doped tin oxide, titanium oxide, and cerium oxide.

[0014] The thickness of the second sunscreen layer is 50nm~500nm.

[0015] The sun protection layer includes a sun protection intermediate layer, and the material of the sun protection intermediate layer includes a substrate and a sun protection material, wherein the substrate is a thermoplastic polymer; When the glass substrate is laminated glass, the laminated glass includes a first glass plate, an intermediate adhesive layer, and a second glass plate stacked in sequence, and the sun-protective intermediate layer serves as the intermediate adhesive layer.

[0016] A second aspect of this application provides a vehicle comprising a body and a sunshade as provided in the first aspect of this application, the sunshade being disposed at an opening in the body.

[0017] The sun-protective glass and vehicle provided in this application, by setting a sun-protective layer on the glass substrate, enable the sun-protective glass to have low light transmittance Tuv1 for light with wavelengths of 300nm~400nm and low light transmittance Tuv2 for light with wavelengths of 380nm~400nm, so that the sun-protective glass has a high sun protection index (SPU) value, achieving heat insulation and sun protection while protecting the user's skin and eyes, reducing skin problems such as sunspots and photoaging caused by long-term exposure, and improving the user experience. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0019] Figure 1 This is a schematic diagram of the structure of the sun-protective glass provided in one embodiment of this application.

[0020] Figure 2 This is a schematic diagram of the structure of a sun-protective glass provided in another embodiment of this application.

[0021] Figure 3 This is a schematic diagram of the structure of a sun-protective glass provided in another embodiment of this application.

[0022] Figure 4 This is a schematic diagram of the structure of a sun-protective glass provided in another embodiment of this application.

[0023] Figure 5 This is a schematic diagram of the structure of a sun-protective glass provided in yet another embodiment of this application.

[0024] Labeling explanation: Sunscreen glass 1, monolithic glass 10, outer surface 101, inner surface 102, laminated glass 20, first glass plate 21, first surface 211, second surface 212, intermediate adhesive layer 22, second glass plate 23, third surface 231, fourth surface 232, sunscreen film 31, sunscreen intermediate layer 32. Detailed Implementation

[0025] The following are preferred embodiments of this application. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

[0026] Before introducing the technical solution of this application, let's go over the technical issues in related technologies in detail.

[0027] The related technologies for car windows usually only focus on heat insulation, so the product solutions are mostly limited to solving the problem of energy transmission and blocking the heat in the sunlight, especially the heat of infrared rays, so as to effectively reduce the indoor temperature.

[0028] Based on the energy distribution of sunlight, it mainly includes three types of electromagnetic waves: ultraviolet light, visible light, and infrared light. Ultraviolet light has a wavelength range between 200nm and 380nm and accounts for 3% of the solar energy; visible light has a wavelength range between 380nm and 780nm and accounts for 44% of the solar energy; and infrared light has a wavelength range between 780nm and 2500nm and accounts for 53% of the solar energy.

[0029] Because the visible light band is perceptible to the human eye, vehicle windows (including the windshield, front quarter window, and front doors) must have high visible light transmittance according to regulations. Therefore, for vehicle windows in related technologies, transmittance begins to increase at 380nm. While this increases transmittance in the visible light band, this band has strong penetrating power, reaching deep into the dermis. This can cause skin problems such as sagging, wrinkles, roughness, and visible capillaries. It also leads to melanin production, causing skin darkening, lack of luster, sunspots, freckles, and age spots, premature skin aging, and malignant melanocyte mutations that can lead to cancer.

[0030] Furthermore, prolonged exposure to light radiation can severely damage the eyes, causing cataracts and eye strain, thus worsening myopia. 82% to 96% of 400nm light enters the lens, causing continuous damage to the eyes.

[0031] Ultraviolet light with wavelengths of 280nm to 320nm is concentrated at midday and in summer, and is the main culprit for sunburn and redness, causing skin swelling and peeling. The real culprit for tanning and premature aging is light with wavelengths of 320nm to 400nm, which is present year-round from sunrise to sunset. Its strong penetrating power stimulates pigment synthesis and causes skin aging and fine lines. In particular, light with wavelengths of 380nm to 400nm can reach deep into the skin; long-term exposure can lead to sunspots and photoaging.

[0032] In view of this, in order to solve the above problems, please refer to the following: Figures 1-5 This embodiment provides a sun-protective glass 1, which includes a glass substrate and a sun-protective layer disposed on the glass substrate.

[0033] The sun-protective glass 1 has a transmittance Tuv1 for light with a wavelength of 300nm~400nm, and the transmittance Tuv1 ≤ 1%; the sun-protective glass 1 has a transmittance Tuv2 for light with a wavelength of 380nm~400nm, and the transmittance Tuv2 ≤ 2%.

[0034] The sun-protective glass 1 has a transmittance Tuv1 for light with a wavelength of 300nm to 400nm, specifically, for example, 1%, 0.9%, 0.8%, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2%, 0.1%, 0.05%, or 0.02%, etc. Preferably, the transmittance Tuv1 ≤ 0.8%; more preferably, the transmittance Tuv1 ≤ 0.5%; even more preferably, the transmittance Tuv1 ≤ 0.2%, or Tuv1 ≤ 0.05%.

[0035] The sun-protective glass 1 has a transmittance Tuv2 for light with a wavelength of 380nm to 400nm, specifically, for example, 2%, 1.9%, 1.8%, 1.7%, 1.6%, 1.5%, 1.4%, 1.3%, 1.2%, 1.1%, 1%, 0.9%, 0.8%, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2%, 0.1%, or the like. Preferably, the transmittance Tuv2 ≤ 1.8%; more preferably, the transmittance Tuv2 ≤ 1.5%; even more preferably, the transmittance Tuv2 ≤ 1.2%, or Tuv2 ≤ 1%, or Tuv2 ≤ 0.08%, or Tuv2 ≤ 0.06%.

[0036] The sun-protective glass 1 has a sun protection factor (SPU), specifically, examples include 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, or 2200. Preferably, the SPU is ≥1250; more preferably, the SPU is ≥1500; even more preferably, the SPU is ≥1750, ≥2000, or ≥2200.

[0037] Furthermore, the sun-protective glass 1 has a visible light transmittance TL for visible light with a wavelength of 380nm to 780nm, and the visible light transmittance TL is ≥65%. Specifically, the visible light transmittance TL for visible light with a wavelength of 380nm to 780nm can be 65%, 70%, 75%, 80%, 85%, 90%, or 95%, etc. Preferably, the visible light transmittance TL is ≥70%; more preferably, the visible light transmittance TL is ≥75%; further preferably, the visible light transmittance TL is ≥80%, or TL is ≥85%.

[0038] In summary, the sun-protective glass 1 provided in this embodiment, by providing a sun-protective layer on the glass substrate, enables the sun-protective glass 1 to have low light transmittance Tuv1 for light with wavelengths of 300nm~400nm and low light transmittance Tuv2 for light with wavelengths of 380nm~400nm, thus enabling the sun-protective glass 1 to have a high sun protection index (SPU) value. This achieves heat insulation and sun protection while protecting the user's skin and eyes, reducing skin problems such as sunspots and photoaging caused by long-term exposure, and improving the user's experience.

[0039] Furthermore, the sun protection layer provided in this embodiment does not affect the visible light transmittance of the sun protection glass 1, thus achieving heat insulation and sun protection while ensuring that the user's driving vision is not affected, and protecting the user's skin and eyes.

[0040] The glass substrate is a single-layer glass or a laminated glass 20. The laminated glass 20 includes a first glass plate 21, an intermediate adhesive layer 22, and a second glass plate 23 stacked in sequence.

[0041] Optionally, the glass substrate is made of soda-lime glass, high-alumina glass, lithium aluminum glass, or borosilicate glass.

[0042] Optionally, the glass substrate is transparent glass, ultra-transparent glass, or light-colored glass, wherein the visible light transmittance of the transparent glass is greater than or equal to 80%, the visible light transmittance of the ultra-transparent glass is greater than or equal to 90%, and the visible light transmittance of the light-colored glass is greater than or equal to 70%.

[0043] When the glass substrate is laminated glass 20, the first glass plate 21 serves as the outer glass plate of the laminated glass 20, and the second glass plate 23 serves as the inner glass plate of the laminated glass 20. The first glass plate 21 has a first surface 211 and a second surface 212. The first surface 211 is away from the intermediate adhesive layer 22 and in contact with the external environment of the vehicle, while the second surface 212 is close to the intermediate adhesive layer 22. The second glass plate 23 has a third surface 231 and a fourth surface 232. The third surface 231 is close to the intermediate adhesive layer 22, while the fourth surface 232 is away from the intermediate adhesive layer 22 and close to the internal environment of the vehicle. At least a portion of the intermediate adhesive layer 22 connects the second surface 212 and the third surface 231.

[0044] The thickness of the first glass panel 21 is 1.6mm to 5mm, such as 1.6mm, 1.8mm, 2.1mm, 2.3mm, 3.2mm, 3.5mm, 4.0mm, 4.5mm, and 5.0mm, with 1.8mm, 2.1mm, and 2.3mm being preferred, and 1.8mm and 2.1mm being even more preferred. The visible light transmittance of the first glass panel 21 is ≥70%, ≥80%, or ≥90%. Optionally, the first glass panel 21 undergoes a high-temperature bending process at at least 500℃. The first glass panel 21 can be ultra-clear glass, clear glass, green glass, solar green, or tinted privacy glass. When the first glass panel 21 is used for vehicle windows before the B-pillar (including but not limited to the windshield, front quarter window, and front door glass), the first glass panel 21 can be ultra-clear glass, clear glass, green glass, or solar green. When the first glass panel 21 is used for vehicle windows after the B-pillar (including but not limited to rear door windows, rear side windows, rear windshield, and sunroof), in addition to ultra-clear glass, clear glass, green glass, and solar green glass, tinted privacy glass, such as gray glass or dark green glass, can also be selected. Furthermore, since ultra-clear glass and clear glass offer very little UV protection, these two types of glass can be considered "non-sunscreen glass," suitable for applications with specific light transmittance requirements, such as scenarios where high light transmittance is required in autonomous driving areas.

[0045] The thickness of the second glass panel 23 is 1.6mm to 5mm, such as 1.6mm, 1.8mm, 2.1mm, 2.3mm, 3.2mm, 3.5mm, 4.0mm, 4.5mm, and 5.0mm, with 1.8mm, 2.1mm, and 2.3mm being preferred, and 1.8mm and 2.1mm being even more preferred. The visible light transmittance of the second glass panel 23 is ≥70%, ≥80%, or ≥90%. Optionally, the second glass panel 23 undergoes a high-temperature bending process at at least 500℃. The second glass panel 23 can be ultra-clear glass, clear glass, green glass, solar green, or tinted privacy glass. When the second glass panel 23 is used for the vehicle windows before the B-pillar (including but not limited to the windshield, front quarter window, and front door windows), the second glass panel 23 can be ultra-clear glass, clear glass, green glass, or solar green. When the second glass panel 23 is used for vehicle windows after the B-pillar (including but not limited to rear door windows, rear side windows, rear windshield, and sunroof), in addition to ultra-clear glass, clear glass, green glass, and solar green glass, tinted privacy glass, such as gray glass or dark green glass, can also be selected. Furthermore, since ultra-clear glass and clear glass offer very little UV protection, these two types of glass can be considered "non-sunscreen" and are suitable for applications with specific light transmittance requirements, such as scenarios where high light transmittance is required in autonomous driving areas.

[0046] Optionally, the visible light transmittance of the intermediate adhesive layer 22 is ≥70%, ≥80%, or ≥85%. When the intermediate adhesive layer 22 is a transparent thermoplastic polymer, the visible light transmittance of the transparent thermoplastic polymer is greater than or equal to 70%. For example, the visible light transmittance of the intermediate adhesive layer 22 may be, but is not limited to, 85%, 90%, or 95%.

[0047] Optionally, the intermediate adhesive layer 22 can be a single-layer or multi-layer structure. Examples of multi-layer structures include double-layer, triple-layer, quadruple-layer, and five-layer structures. The intermediate adhesive layer 22 can also have other functions, such as adding infrared absorbers to provide sun protection or heat insulation, adding ultraviolet absorbers to provide ultraviolet protection, or having at least one layer of the multi-layer structure with a higher plasticizer content to provide sound insulation.

[0048] The intermediate adhesive layer 22 can be a first intermediate layer without heat insulation function, or a second intermediate layer with heat insulation function. The thickness of the first intermediate layer is 0.3mm to 2.3mm, for example, 0.38mm, 0.51mm, 0.76mm, 0.81mm, etc., with 0.38mm and 0.76mm preferred, and 0.76mm even more preferred. The material of the first intermediate layer can be selected from at least one of polycarbonate (PC), polyvinyl chloride (PVC), polyvinyl butyral (PVB), polyacrylate (PA), polymethyl methacrylate (PMMA), polyurethane (PUR), and ionomer film (SGP). The visible light transmittance of the first intermediate layer is ≥70%. The first intermediate layer can be a transparent thermoplastic polymer film or a light-colored thermoplastic polymer film. Optionally, the first intermediate layer can also have other functions, such as the first intermediate layer can also include at least two layers, one of which has a higher plasticizer content to provide sound insulation function, or one of which is wedge-shaped to provide a head-up display (HUD) function, etc.

[0049] The second interlayer can be a nano-insulating film. The main materials of the second interlayer include polyvinyl butyral resin (PVB), plasticizer, and intermediate functional layer insulating particles. For example, the functional layer insulating particles can be ITO material or UV and IR blocking agents. The insulating functional layer of the second interlayer can be deposited onto the film surface using physical vapor deposition or sputtering deposition techniques. The second interlayer can convert solar energy into heat energy, blocking it on the car glass, and dissipating the heat into the air through airflow outside the vehicle. The thickness of the second interlayer is 0.3mm to 2.3mm, for example, 0.38mm, 0.51mm, 0.76mm, 0.81mm, etc., with 0.38mm and 0.76mm preferred, and 0.76mm even more preferred. Optionally, the second interlayer can also have other functions, such as the thermoplastic interlayer comprising at least two layers, one of which has a higher plasticizer content for sound insulation, or one layer being wedge-shaped for a head-up display (HUD) function, etc.

[0050] Please refer to this as well. Figures 1-3 In one embodiment, the sun protection layer includes a sun protection film 31.

[0051] When the glass substrate is a single piece of glass 10, the sun protection film 31 is disposed on at least one side surface of the single piece of glass 10.

[0052] When the glass substrate is laminated glass 20, the laminated glass 20 includes a first glass plate 21, an intermediate adhesive layer 22, and a second glass plate 23 stacked in sequence, and the sun protection film 31 is disposed on the first glass plate 21 and / or the second glass plate 23.

[0053] The single-pane glass 10 has an outer surface 101 facing the external environment and an inner surface 102 facing the interior environment of the vehicle, and the sun protection film 31 is disposed on the outer surface 101 and / or the inner surface 102.

[0054] For example, the sun protection film 31 is disposed on the first surface 211 and / or the second surface 212 of the first glass plate 21. As another example, the sun protection film 31 is disposed on the third surface 231 and / or the fourth surface 232 of the second glass plate 23.

[0055] Specifically, in one embodiment, the sunscreen film 31 includes a first sunscreen layer, which is prepared from a sunscreen coating. The material of the sunscreen coating is selected from one or more of ultraviolet absorbers, rare earth elements, and cesium tungsten bronze.

[0056] Rare earth elements include, but are not limited to, scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium.

[0057] Ultraviolet absorbers and rare earth elements can efficiently absorb ultraviolet energy in the range of 280nm~400nm, and cesium tungsten bronze can absorb ultraviolet rays in the range of 300-400nm and 380-400nm. As a result, the sun protection glass 1 has low light transmittance Tuv1 for light with a wavelength of 300nm~400nm and low light transmittance Tuv2 for light with a wavelength of 380nm~400nm, so that the sun protection glass 1 has a high sun protection index (SPU) value.

[0058] Optionally, the material of the sunscreen coating includes cesium tungsten bronze; the sunscreen film 31 includes a cesium tungsten bronze layer, and the cesium tungsten bronze layer further includes WO3 and TiO2.

[0059] Cesium tungsten bronze can reflect and / or scatter ultraviolet light, and its special crystal structure can effectively shield near-infrared and ultraviolet light.

[0060] This embodiment, by superimposing a bandgap gradient material layer of WO3 and TiO2 on a cesium tungsten bronze layer, allows for adjustment of the WO3-TiO2 ratio according to product requirements, covering the 380nm-400nm wavelength band. This avoids the limitations of adjusting a single material, improves the light blocking performance of the sunscreen film 31 for wavelengths of 380nm-400nm, thereby reducing the light transmittance Tuv2 of the sunscreen glass 1 for wavelengths of 380nm-400nm, and also helps to improve the sun protection index SPU of the sunscreen glass 1.

[0061] Sunscreen coatings can be applied to the surface of glass through processes such as thermal spraying, vapor deposition, sol-gel, spin coating, and blade coating to form a coating, thereby obtaining a sunscreen film 31.

[0062] The thickness of the first sun protection layer is 2μm to 12μm, specifically, for example, 2μm, 4μm, 6μm, 8μm, 10μm, or 12μm. Preferably, the thickness of the first sun protection layer is 4μm to 10μm.

[0063] Furthermore, the material of the sunscreen coating also includes an ultraviolet absorber, wherein the ultraviolet absorber is selected from at least one of benzimidazole ultraviolet absorbers, triazine ultraviolet absorbers, and benzotriazole derivative ultraviolet absorbers.

[0064] Optionally, the benzimidazole UV absorber includes a benzotriazole derivative; alternatively, the benzimidazole UV absorber may include 2 (2' hydroxyl 5' (methylphenyl) benzotriazole, 2 (2' hydroxyl 3',5' 2[1,1] [dimethylphenyl]phenyl) benzotriazole, 2 (2' hydroxyl 3'-tert-butyl 5'-methylphenyl) 5 chlorine One or more of benzotriazole, Chiguard 234, and Chiguard 380.

[0065] Optionally, the triazine UV absorber may include 2 cyano 3,3 Ethyl diphenylacrylate, 2 cyano 3,3 One or a combination of two or more of diphenylisooctyl acrylate, Chiguard 1064, and Chiguard 5431.

[0066] Optionally, the benzotriazole derivative UV absorber may include one or a combination of two or more of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-pentylphenyl)benzotriazole, and 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole.

[0067] Furthermore, the absorption peak of the ultraviolet absorber is 315nm~380nm, and may further be 340nm~380nm.

[0068] This embodiment increases the blocking wavelength by adding ultraviolet absorbers to the material, thereby improving the blocking performance of the sunscreen film 31 for light with wavelengths less than 380nm. This results in the sunscreen glass 1 having low light transmittance (Tuv1) for light with wavelengths of 300nm to 400nm, while maintaining high visible light transmittance (TL). It also helps to increase the sun protection index (SPU) of the sunscreen glass 1.

[0069] Furthermore, the sunscreen coating material includes the cesium tungsten bronze and the ultraviolet absorber, wherein the mass ratio of the ultraviolet absorber to the cesium tungsten bronze is (1.5~3):1. Specific examples of the mass ratio of the ultraviolet absorber to the cesium tungsten bronze include 1.5:1, 1.75:1, 2:1, 2.25:1, 2.5:1, 2.75:1, or 3:1, etc.

[0070] The ultraviolet absorber is selected from at least one of benzimidazole ultraviolet absorbers, triazine ultraviolet absorbers, and benzotriazole derivative ultraviolet absorbers. Preferably, the ultraviolet absorber includes benzotriazole derivatives.

[0071] This embodiment limits the mass ratio of ultraviolet absorber to cesium tungsten bronze, so that the ultraviolet absorber and cesium tungsten bronze work together to improve the light blocking performance of the sunscreen film 31 for wavelengths of 380nm to 400nm, thereby reducing the light transmittance (Tuv2) of the sunscreen glass 1 for wavelengths of 380nm to 400nm, and also helps to improve the sun protection index (SPU) of the sunscreen glass 1.

[0072] Furthermore, the material of the sunscreen coating also includes at least one of metal nanoparticles and inorganic nanoparticles.

[0073] Specifically, when the material of the sunscreen coating further includes the metal nanoparticles, the metal nanoparticles satisfy at least one of the following conditions: the material of the metal nanoparticles is selected from one or more of silver and gold; and / or, the particle size range of the metal nanoparticles is 10nm~30nm.

[0074] The particle size range of the metal nanoparticles can be exemplified by, for example, 10 nm, 15 nm, 20 nm, 25 nm, or 30 nm. Preferably, the particle size range of the metal nanoparticles is 15 nm to 25 nm.

[0075] This embodiment improves the light blocking performance of the sunscreen film 31 for wavelengths of 380nm to 400nm by adding metal nanoparticles to the material and enhancing light absorption near 400nm through surface plasmon resonance. It also reduces the light transmittance (Tuv2) of the sunscreen glass 1 for wavelengths of 380nm to 400nm and helps to improve the sun protection index (SPU) of the sunscreen glass 1.

[0076] When the material of the sunscreen coating further includes the inorganic nanoparticles, the inorganic nanoparticles satisfy at least one of the following conditions: the material of the inorganic nanoparticles is selected from one or more of CeO2, ZnO, and TiO2; and / or, the particle size range of the inorganic nanoparticles is 5nm to 20nm.

[0077] The particle size range of the inorganic nanoparticles can be exemplified by, for example, 5 nm, 10 nm, 15 nm, or 20 nm. Preferably, the particle size range of the inorganic nanoparticles is 10 nm to 20 nm.

[0078] For example, CeO2 (cerium oxide) can absorb light in the range of 380 nm to 400 nm by controlling the particle size; another example is that nano ZnO (zinc oxide) has good absorption in the range of 320 nm to 400 nm; yet another example is that TiO2 (titanium dioxide) can be selected as anatase or doped, such as with nitrogen, to broaden the absorption range.

[0079] This embodiment adds inorganic nanoparticles to the material and utilizes the quantum effect or surface plasmon resonance effect of nanomaterials to adjust the absorption wavelength. This not only allows for the absorption of more light in the 380nm~400nm range but also broadens the absorption range. Consequently, it improves the light-blocking performance of the sunscreen film 31 for wavelengths of 380nm~400nm and for wavelengths less than 380nm. It also reduces the light transmittance Tuv1 and Tuv2 of the sunscreen glass 1 for wavelengths of 300nm~400nm, giving the sunscreen glass 1 a high sun protection factor (SPU) value.

[0080] In another embodiment, the sun protection film 31 includes a second sun protection layer, which includes at least one of a metal layer, a metal alloy layer, and a metal oxide layer.

[0081] Optionally, the second sunscreen layer is prepared by magnetron sputtering. For example, the second sunscreen layer is directly deposited onto the first glass plate 21 or the second glass plate 23 by magnetron sputtering.

[0082] In this embodiment, a metal layer, a metal alloy layer, and a metal oxide layer are used as the second sun protection layer. The second sun protection layer has the effect of absorbing or reflecting ultraviolet rays in the range of 300nm to 400nm and / or 380nm to 400nm, which can effectively block ultraviolet rays. As a result, the sun protection glass 1 has a low transmittance Tuv1 for light with a wavelength of 300nm to 400nm and a low transmittance Tuv2 for light with a wavelength of 380nm to 400nm, so that the sun protection glass 1 has a high sun protection index (SPU) value.

[0083] The thickness of the second sunscreen layer is 50nm to 500nm, specifically for examples such as 50nm, 55nm, 60nm, 65nm, 70nm, 75nm, 80nm, 85nm, 90nm, 95nm, 100nm, 150nm, 200nm, 250nm, 300nm, 350nm, 400nm, 450nm, or 500nm. Preferably, the thickness of the second sunscreen layer is 100nm to 300nm.

[0084] Furthermore, when the second sunscreen layer includes the metal layer, the material of the metal layer includes at least one of gold, silver, copper, aluminum, and molybdenum.

[0085] And / or, when the second sun protection layer includes the metal alloy layer, the material of the metal alloy layer includes at least one of silver alloy, nickel-chromium alloy, and titanium-tungsten alloy.

[0086] And / or, when the second sunscreen layer includes the metal oxide layer, the material of the metal oxide layer includes at least one of indium tin oxide, fluorine-doped tin dioxide, aluminum-doped tin dioxide, gallium-doped tin dioxide, boron-doped tin dioxide, tin-zinc oxide, antimony-doped tin oxide, titanium oxide, and cerium oxide.

[0087] Based on the use of metal layer, metal alloy layer and metal oxide layer as sun protection film 31 in this embodiment, the material combination is further optimized to reduce the transmittance Tuv2 of the sun protection glass 1 for wavelengths of 380nm~400nm, and also to improve the sun protection index SPU of the sun protection glass 1.

[0088] Optionally, the material of the metal layer may also include one or more transition metals.

[0089] The transition metal is selected from one or more of molybdenum and titanium.

[0090] This embodiment introduces transition metal ions into the metal layer material to change the lattice parameters and electronic structure, reduce the material band gap, thereby improving the light blocking performance of the sunscreen film 31 for wavelengths of 380nm~400nm, reducing the light transmittance Tuv2 of the sunscreen glass 1 for wavelengths of 380nm~400nm, and also helping to improve the sun protection index SPU of the sunscreen glass 1.

[0091] Please refer to this as well. Figures 4-5 In one embodiment, the sunscreen layer includes a sunscreen interlayer 32, the material of which comprises a substrate and a sunscreen material, wherein the substrate is a thermoplastic polymer. The material of the thermoplastic polymer film may be selected from at least one of polyvinyl butyral (PVB), polyurethane (PU), ethylene-vinyl acetate copolymer (EVA), and ionic polymers (SGP). Preferably, the material of the thermoplastic polymer film is selected from polyvinyl butyral (PVB).

[0092] When the glass substrate is laminated glass 20, the laminated glass 20 includes a first glass plate 21, an intermediate adhesive layer 22, and a second glass plate 23 stacked in sequence, and the sun-protective intermediate layer 32 serves as the intermediate adhesive layer 22.

[0093] The first glass plate 21, the sun-protective intermediate layer 32, and the second glass plate 23 are stacked in sequence. The sun-protective intermediate layer 32 is disposed between the first glass plate 21 and the second glass plate 23, and at least part of the sun-protective intermediate layer 32 is bonded to the first glass plate 21 and the second glass plate 23.

[0094] The material of the sun protection interlayer 32 includes a substrate and a sun protection material, which can be prepared by the traditional interlayer preparation process of laminated glass.

[0095] This embodiment further optimizes the sunscreen material by using either a first intermediate layer or a second intermediate layer as a base to reduce the transmittance (Tuv2) of the sunscreen glass 1 for wavelengths of 380nm to 400nm. Preferably, the second intermediate layer is used as the base for preparing the sunscreen intermediate layer 32.

[0096] In this embodiment, the sunscreen material can be selected from one or more of ultraviolet absorbers, rare earth elements, and cesium tungsten bronze.

[0097] In one embodiment, rare earth elements include, but are not limited to, scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium.

[0098] In one embodiment, the sunscreen material includes an ultraviolet absorber, wherein the material of the second ultraviolet absorber is selected from at least one of benzimidazole ultraviolet absorbers, triazine ultraviolet absorbers, and benzotriazole derivative ultraviolet absorbers.

[0099] Optionally, the benzimidazole UV absorber includes a benzotriazole derivative; alternatively, the benzimidazole UV absorber may include 2 (2' hydroxyl 5' (methylphenyl) benzotriazole, 2 (2' hydroxyl 3',5' 2[1,1] [dimethylphenyl]phenyl) benzotriazole, 2 (2' hydroxyl 3'-tert-butyl 5'-methylphenyl) 5 chlorine One or more of benzotriazole, Chiguard 234, and Chiguard 380.

[0100] Optionally, the triazine UV absorber may include 2 cyano 3,3 Ethyl diphenylacrylate, 2 cyano 3,3 One or a combination of two or more of diphenylisooctyl acrylate, Chiguard 1064, and Chiguard 5431.

[0101] Optionally, the benzotriazole derivative UV absorber may include one or a combination of two or more of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-pentylphenyl)benzotriazole, and 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole.

[0102] Optionally, the absorption peak of the ultraviolet absorber is 315 nm to 380 nm, and more specifically, it can be 340 nm to 380 nm.

[0103] This embodiment increases the blocking wavelength by adding an ultraviolet absorber to the material, thereby improving the blocking performance of the sunscreen intermediate layer 32 for light with wavelengths less than 380nm. This results in the sunscreen glass 1 having a low transmittance Tuv1 for light with wavelengths of 300nm to 400nm, and a high sun protection index (SPU) value, while maintaining a high visible light transmittance TL.

[0104] In another embodiment, the sunscreen material comprises inorganic nanoparticles.

[0105] The inorganic nanoparticles satisfy at least one of the following conditions: the material of the inorganic nanoparticles is selected from one or more of CeO2, ZnO, and TiO2; and / or the particle size range of the inorganic nanoparticles is 5nm to 20nm.

[0106] The particle size range of the inorganic nanoparticles can be exemplified by, for example, 5 nm, 10 nm, 15 nm, or 20 nm. Preferably, the particle size range of the inorganic nanoparticles is 10 nm to 20 nm.

[0107] For example, CeO2 (cerium oxide) can absorb light in the range of 380 nm to 400 nm by controlling the particle size; another example is that nano ZnO (zinc oxide) has good absorption in the range of 320 nm to 400 nm; yet another example is that TiO2 (titanium dioxide) can be selected as anatase or doped, such as with nitrogen, to broaden the absorption range.

[0108] This embodiment adds inorganic nanoparticles to the material and utilizes the quantum effect or surface plasmon resonance effect of nanomaterials to adjust the absorption wavelength. This not only allows for the absorption of more light in the 380nm~400nm range but also broadens the absorption range. Consequently, it improves the light-blocking performance of the sunscreen interlayer 32 for wavelengths of 380nm~400nm and for wavelengths less than 380nm. It also reduces the light transmittance Tuv1 and Tuv2 of the sunscreen glass 1 for wavelengths of 300nm~400nm, giving the sunscreen glass 1 a high sun protection factor (SPU) value.

[0109] In another embodiment, the sunscreen material comprises monomers containing benzene rings or conjugated structures.

[0110] This embodiment introduces monomers with ultraviolet absorption function into the PVB molecular chain by adding monomers containing benzene rings or conjugated structures to the material, thereby improving the light blocking performance of the sunscreen intermediate layer 32 for wavelengths less than 380nm, reducing the light transmittance Tuv1 of the sunscreen glass 1 for wavelengths of 300nm~400nm, and giving the sunscreen glass 1 a high sun protection index (SPU) value.

[0111] In another embodiment, the sun protection intermediate layer 32 includes a first sun protection sub-layer and a second sun protection sub-layer stacked together. The first sun protection sub-layer is used to block light with a wavelength less than 380nm, and the second sun protection sub-layer is used to block light with a wavelength of 380nm to 400nm.

[0112] This embodiment incorporates a first and a second sun protection sub-layer, designing a multi-layer structure within the PVB interlayer. Each layer targets different wavelengths, resulting in sun-protective glass 1 exhibiting low transmittance (Tuv1) for light with wavelengths of 300nm to 400nm and low transmittance (Tuv2) for light with wavelengths of 380nm to 400nm. This gives sun-protective glass 1 a high sun protection factor (SPU) value, achieving heat insulation and sun protection while protecting the user's skin and eyes. It also reduces skin problems such as sunspots and photoaging caused by long-term exposure, improving the user experience.

[0113] Please refer to Figure 5 In one embodiment, the sun protection layer includes a sun protection film 31 and a sun protection intermediate layer 32. The glass substrate is a laminated glass 20. The laminated glass 20 includes a first glass plate 21, an intermediate adhesive layer 22, and a second glass plate 23 stacked sequentially. The sun protection intermediate layer 32 serves as the intermediate adhesive layer 22. The sun protection film 31 is disposed on the first glass plate 21 and / or the second glass plate 23.

[0114] The sun protection film 31 can be disposed on the first surface 211 or the second surface 212 of the first glass plate 21, and the sun protection film 31 can be disposed on the third surface 231 or the fourth surface 232 of the second glass plate 23. When the sun protection film 31 is disposed on the first surface 211 or the fourth surface 232, it is preferably a sun protection film 31 prepared with a sun protection coating. When the sun protection film 31 is disposed on the second surface 212 or the third surface 231, it is preferably a sun protection film 31 prepared with a metal film, a metal alloy film, or a metal oxide film.

[0115] This application also provides a vehicle, the vehicle including a body and a sunshade glass as described above, the sunshade glass being disposed at an opening in the body.

[0116] Sunscreen glass can be used as a front windshield, rear windshield, sunroof, side window, or corner window, thus providing more application scenarios for vehicles.

[0117] The vehicle provided in this embodiment, by adopting the sun-protective glass provided in this application, and by setting a sun-protective layer on the glass substrate, enables the sun-protective glass to have low light transmittance Tuv1 for light with wavelengths of 300nm~400nm and low light transmittance Tuv2 for light with wavelengths of 380nm~400nm, thus enabling the sun-protective glass to have a high sun protection index (SPU) value. This achieves heat insulation and sun protection while protecting the user's skin and eyes, reducing skin problems such as sunspots and photoaging caused by long-term exposure, and improving the user's experience.

[0118] To make the objectives and advantages of this application clearer, the effects of the sun-protective glass of this application will be further explained in detail below with reference to specific embodiments.

[0119] Comparative Example 1: First glass plate / intermediate adhesive layer / second glass plate; wherein, the first intermediate layer, which does not have a heat insulation function, is used as the intermediate adhesive layer.

[0120] Comparative Example 2: First glass plate / intermediate adhesive layer / second glass plate; wherein, the second intermediate layer with heat insulation function is used as the intermediate adhesive layer.

[0121] Comparative Example 3: Heat-absorbing monocular glass; wherein, the heat-absorbing monocular glass is selected from green glass, or solar green, or privacy glass with other colors.

[0122] Example 1: First glass plate / sun protection interlayer / second glass plate.

[0123] Example 2: First glass plate / silver-based coating / sunscreen intermediate layer / second glass plate.

[0124] Example 3: First glass plate / sunscreen film / intermediate adhesive layer / second glass plate; wherein, the first intermediate layer without heat insulation function is used as the intermediate adhesive layer.

[0125] Example 4: First glass plate / sunscreen film / intermediate adhesive layer / sunscreen film / second glass plate; wherein, the first intermediate layer without heat insulation function is used as the intermediate adhesive layer.

[0126] Example 5: First glass plate / silver-based coating / sun protection interlayer / sun protection film / second glass plate.

[0127] Example 6: Heat-absorbing monolithic glass / sunscreen film.

[0128] The sunscreen materials of the sunscreen film or sunscreen intermediate layer in Examples 1-6 include: siloxane, first silane coupling agent, organic solvent, benzotriazole derivatives, cesium tungsten bronze, catalyst and water.

[0129] The mass ratio of siloxane, silane coupling agent, organic solvent, benzotriazole derivatives, cesium tungsten bronze, catalyst and water is 35:3:52:17:8:0.05:10.5.

[0130] Among them, siloxanes serve as film-forming agents and skin feel modifiers, silane coupling agents serve as interface bridging agents and dispersion stabilizers, organic solvents can dissolve dispersion media and film-forming aids, catalysts serve as crosslinking reaction promoters, and water is used for hydrolysis reactants and film pore-forming agents.

[0131] The first and second glass panels are made of ordinary clear glass without sun protection. The sun protection film is applied to the glass surface through processes such as lamination, thermal spraying, or vapor deposition.

[0132] The sun-protective glass provided in Comparative Examples 1-3 and Examples 1-6 was tested, and the test results are as follows: (1) Light with a wavelength of 300nm~400nm has a transmittance of Tuv1.

[0133] (2) It has a transmittance of Tuv2 for light with wavelengths of 380nm~400nm.

[0134] (3) It has a transmittance of Tuv3 for light with wavelengths of 300nm~380nm.

[0135] (3) It has visible light transmittance TL for visible light with wavelengths of 380nm~780nm.

[0136] (4) The sun protection factor (SPU) level. The higher the SPU, the less ultraviolet light passes through the sun protection glass, and the better the sun protection effect.

[0137] The SPU (Sun Protection Factor) testing process is as follows: Step 1, Sample preparation: Prepare a glass sample with dimensions of 100mm*100mm.

[0138] Step 2, Instrument Testing: Using a UV spectrophotometer, place the sample between the light source and the detector, and measure the spectral transmittance of ultraviolet light after passing through the glass sample. The spectral transmittance in the 300nm~380nm range is measured according to ISO 9050 standard, while the spectral transmittance in the 300nm~400nm and 380nm~400nm ranges is measured according to ISO 13837 standard.

[0139] Step 3: Data Analysis: Based on the measured spectral data, calculate the SPU value and other relevant parameters of the sample according to the formula. The formula for calculating the SPU value is shown below: ; Where λ represents the ultraviolet wavelength in nanometers. The summation symbol Σ indicates the calculation of the cumulative effect across the entire ultraviolet band from 300 nm to 400 nm.

[0140] E(λ): Erythema spectral irradiance, which can be understood as "the effectiveness weight of sunlight at different wavelengths in causing erythema (sunburn) on the skin". It is not a constant value, but a standardized spectral distribution function that simulates the solar spectrum at noon.

[0141] T(λ): Ultraviolet spectral transmittance of the glass at wavelength λ.

[0142] ε(λ): Relative erythema effect coefficient, which is another weighting factor that complements E(λ) and further quantifies the biological effects of different wavelengths of ultraviolet radiation on skin erythema.

[0143] Δλ: Wavelength interval, usually 1nm or 5nm. Modern instruments typically measure in 1nm increments, so the summation process involves calculating the sum of these data points at 300, 301, 302, ..., 400nm.

[0144] Table 1. Test Results Data for Comparative Examples 1-3 and Examples 1-6

[0145] As shown in Table 1, for Example 1 which uses a sunscreen interlayer, compared to Comparative Examples 1 and 2 which use a related technology interlayer adhesive layer, the Tuv1 of the sunscreen glass in Example 1 is significantly reduced. This indicates that the sunscreen interlayer can provide deep blocking of light with wavelengths of 300nm to 400nm, especially light with wavelengths of 380nm to 400nm, reducing damage to the skin. Furthermore, the sun protection factor (SPF) of the sunscreen glass in Example 1 can be increased by at least 700 points.

[0146] As can be seen from Examples 3-4, by setting the sunscreen film provided in this application, light with a wavelength of 300nm~400nm can be significantly blocked, especially light with a wavelength of 380nm~400nm, reducing damage to the skin. Furthermore, the sun protection factor (SPU) of the sunscreen glass in Examples 3-4 can be increased by at least 800 points.

[0147] In Example 5, not only the sun protection intermediate layer and sun protection film provided in this application are used, but also a silver-based coating is used. The sun protection film can also reduce Tuv3 to almost zero, achieving the best sun protection effect. However, since TL < 70%, it can be applied to rear door glass, rear side window glass, rear windshield glass, and sunroof glass, areas where the requirement for visible light transmittance TL is not high.

[0148] In Example 6, the sunscreen film provided in this application is used in combination with heat-absorbing monolithic glass, thereby deeply blocking ultraviolet rays and reducing damage to the skin. Compared with Comparative Example 3, the sun protection factor (SPU) of the sunscreen glass in Example 6 can be significantly increased to 1951.5.

[0149] Therefore, by adopting the sun-protective glass provided in this application, and by setting a sun-protective layer on the glass substrate, the sun-protective glass can have low light transmittance Tuv1 for light with a wavelength of 300nm~400nm and low light transmittance Tuv2 for light with a wavelength of 380nm~400nm. This gives the sun-protective glass a high sun protection index (SPU) value, achieving heat insulation and sun protection while protecting the user's skin and eyes, reducing skin problems such as sunspots and photoaging caused by long-term exposure, and improving the user's experience.

[0150] Unless otherwise stated or in case of conflict, the terms or phrases used in this application shall have the following meanings: In this application, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0151] In this application, "one or more" refers to any one, any two, or any two or more of the listed items. "Several" refers to any two or more.

[0152] In this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0153] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0154] In this application, the terms "embodiment" and "implementation" mean that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of these phrases in various locations throughout the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described in this application can be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the various embodiments of this application can be arbitrarily combined to form another embodiment that does not depart from the spirit and scope of the technical solution of this application, provided there is no contradiction between them.

[0155] The above description represents some embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. A type of sun-protective glass, characterized in that, The sun-protective glass includes a glass substrate and a sun-protective layer disposed on the glass substrate; The sun-protective glass has a transmittance Tuv1 for light with a wavelength of 300nm~400nm, and the transmittance Tuv1 is ≤1%. The sun-protective glass has a transmittance Tuv2 for light with a wavelength of 380nm~400nm, and the transmittance Tuv2 ≤ 2%.

2. The sun-protective glass as described in claim 1, characterized in that, The transmittance Tuv1 is ≤0.8%, or Tuv1 ≤0.5%, or Tuv1 ≤0.2%, or Tuv1 ≤0.05%.

3. The sun-protective glass as described in claim 1, characterized in that, The transmittance is Tuv2 ≤ 1.8%, or Tuv2 ≤ 1.5%, or Tuv2 ≤ 1.2%, or Tuv2 ≤ 1%, or Tuv2 ≤ 0.08%, or Tuv2 ≤ 0.06%.

4. The sun-protective glass as described in claim 1, characterized in that, The sun-protective glass has a sun protection factor (SPU) of ≥1000, ≥1250, ≥1500, ≥1750, or ≥2000.

5. The sun-protective glass as described in claim 1, characterized in that, The sun protection layer includes a sun protection film; When the glass substrate is a single piece of glass, the sun protection film is disposed on at least one side surface of the single piece of glass; When the glass substrate is laminated glass, the laminated glass includes a first glass plate, an intermediate adhesive layer, and a second glass plate stacked in sequence, and the sun protection film is disposed on the first glass plate and / or the second glass plate.

6. The sun-protective glass as described in claim 5, characterized in that, The sun protection film includes a first sun protection layer, which is prepared by a sun protection coating. The material of the sun protection coating is selected from one or more of ultraviolet absorbers, rare earth elements, and cesium tungsten bronze.

7. The sun-protective glass as described in claim 6, characterized in that, The ultraviolet absorber is selected from at least one of benzimidazole ultraviolet absorbers, triazine ultraviolet absorbers, and benzotriazole derivative ultraviolet absorbers.

8. The sun-protective glass as described in claim 6, characterized in that, The absorption peak of the ultraviolet absorber is 315 nm to 380 nm.

9. The sun-protective glass as described in claim 6, characterized in that, The thickness of the first sun protection layer is 2μm~12μm.

10. The sun-protective glass according to any one of claims 1-9, characterized in that, The sun protection film includes a second sun protection layer, which includes at least one of a metal layer, a metal alloy layer, and a metal oxide layer.

11. The sun-protective glass as described in claim 10, characterized in that, When the second sun protection layer includes the metal layer, the material of the metal layer includes at least one of gold, silver, copper, aluminum, and molybdenum; And / or, when the second sun protection layer includes the metal alloy layer, the material of the metal alloy layer includes at least one of silver alloy, nickel-chromium alloy, and titanium-tungsten alloy; And / or, when the second sunscreen layer includes the metal oxide layer, the material of the metal oxide layer includes at least one of indium tin oxide, fluorine-doped tin dioxide, aluminum-doped tin dioxide, gallium-doped tin dioxide, boron-doped tin dioxide, tin-zinc oxide, antimony-doped tin oxide, titanium oxide, and cerium oxide.

12. The sun-protective glass as described in claim 10, characterized in that, The thickness of the second sun protection layer is 50nm~500nm.

13. The sun-protective glass as described in claim 1, 6, or 10, characterized in that, The sun protection layer includes a sun protection intermediate layer, and the material of the sun protection intermediate layer includes a substrate and a sun protection material, wherein the substrate is a thermoplastic polymer; When the glass substrate is laminated glass, the laminated glass includes a first glass plate, an intermediate adhesive layer, and a second glass plate stacked in sequence, and the sun-protective intermediate layer serves as the intermediate adhesive layer.

14. A vehicle, characterized in that, The vehicle includes a body and a sun-protective glass as described in any one of claims 1-13, the sun-protective glass being disposed at an opening in the body.

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