Infrared barrier film for vehicle window
By installing a multi-layer infrared blocking film on the car windows, the problem of low reflectivity and heat insulation of existing car window insulation films is solved, higher infrared reflectivity and heat insulation effect are achieved, and the comfort and privacy in the car are improved.
Patent Information
- Application Number
- CN202422851280.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-11-21
AI Technical Summary
The existing window insulation films have low infrared reflectivity and heat insulation rates, and cannot meet the high efficiency and energy-saving needs of new energy vehicles.
The infrared blocking film adopts a multi-layer structure, including a substrate layer, a niobium oxide layer, a first Ag layer, a zinc aluminum oxide layer, a second Ag layer, a NiCr layer and a silicon oxide layer. These layers are stacked by magnetron sputtering technology to improve the infrared reflectivity and reduce the transmittance.
It achieves higher infrared reflectivity and lower transmittance, improves heat insulation and privacy, and enhances driving comfort in the car.
Smart Images
Figure CN223357731U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of film materials, and in particular relates to an infrared blocking film for vehicle windows. Background Art
[0002] Car films can be categorized into four types based on their intended purpose: thermal insulation film, glass shielding film, paint protection film, and color-changing film. The first two are window films, while the latter two are body films. Different types of car films address different needs. Currently, the most commonly used is thermal insulation film, which is applied to the inside of car windows to insulate, block light, isolate UV rays, protect the window glass, and maintain privacy. Existing thermal insulation films have low infrared reflectivity and low heat insulation. Commonly used thermal insulation films have a reflectivity of approximately 60% within the 780-2000nm range. Furthermore, with the development of new energy vehicles, window films are also having a certain impact on their energy efficiency, leading to an increasing demand for side window films with higher infrared reflectivity.
[0003] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Utility Model Content
[0004] The purpose of the utility model is to provide an infrared blocking film for vehicle windows, which has high reflectivity to infrared rays and good heat insulation effect.
[0005] To achieve the above objectives, a specific embodiment of the present invention provides the following technical solution: an infrared blocking film for vehicle windows, comprising, from bottom to top, a substrate layer, a niobium oxide layer, a first Ag layer, a zinc-aluminum oxide layer, a second Ag layer, a NiCr layer, and a silicon oxide layer. The niobium oxide layer is magnetron sputtered onto a surface of the substrate layer; the first Ag layer is magnetron sputtered onto a surface of the niobium oxide layer; the zinc-aluminum oxide layer is magnetron sputtered onto a surface of the first Ag layer; the second Ag layer is magnetron sputtered onto a surface of the zinc-aluminum oxide layer; the NiCr layer is magnetron sputtered onto a surface of the second Ag layer; and the silicon oxide layer is magnetron sputtered onto a surface of the NiCr layer.
[0006] In one or more embodiments of the present invention, the thickness of the niobium oxide layer is between 30 nm and 40 nm.
[0007] In one or more embodiments of the present invention, the thickness of the zinc oxide aluminum layer is between 30 nm and 40 nm.
[0008] In one or more embodiments of the present invention, the thickness of the first Ag layer is between 10 nm and 15 nm.
[0009] In one or more embodiments of the present invention, the thickness of the second Ag layer is between 10 nm and 15 nm.
[0010] In one or more embodiments of the present invention, the NiCr layer is between 1 nm and 3 nm.
[0011] In one or more embodiments of the present invention, the thickness of the silicon oxide layer is between 30 nm and 40 nm.
[0012] In one or more embodiments of the present invention, the thickness of the substrate layer is between 23 μm and 250 μm.
[0013] In one or more embodiments of the present invention, the substrate layer is selected from one of a PET layer, a TAC layer, an SRF layer, a COP layer and a PC layer.
[0014] Compared to existing technologies, the infrared-blocking film for vehicle windows of this invention, through its laminated structure of a first Ag layer, a zinc-aluminum oxide layer, and a second Ag layer, can increase the film's reflectivity and reduce its transmittance, thereby reducing the amount of infrared radiation entering the vehicle interior and achieving higher heat insulation. Furthermore, this infrared-blocking film for vehicle windows has a lower visible light transmittance, improving both reflectivity and privacy. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0016] Figure 1 This is a schematic diagram of an infrared blocking film for a vehicle window in one embodiment of the present invention;
[0017] Figure 2 A graph showing the reflectivity of the infrared blocking films of the comparative example and the embodiment in one embodiment of the present invention;
[0018] Figure 3 This is a curve diagram of the transmittance of the infrared blocking films of the comparative example and the embodiment in one embodiment of the present invention.
[0019] Description of main reference numerals:
[0020] 1-substrate layer, 2-niobium oxide layer, 3-first Ag layer, 4-zinc aluminum oxide layer, 5-second Ag layer, 6-NiCr layer, 7-silicon oxide layer. DETAILED DESCRIPTION
[0021] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.
[0022] like Figure 1 As shown, an infrared blocking film for vehicle windows in one embodiment of the present invention comprises, from bottom to top, a substrate layer 1, a niobium oxide layer 2, a first Ag layer 3, a zinc-aluminum oxide layer 4, a second Ag layer 5, a NiCr layer 6, and a silicon oxide layer 7. The niobium oxide layer 2 is magnetron sputtered on a surface of the substrate layer 1. The first Ag layer 3 is magnetron sputtered on the surface of the niobium oxide layer 2. The zinc-aluminum oxide layer 4 is magnetron sputtered on the surface of the first Ag layer 3. The second Ag layer 5 is magnetron sputtered on the surface of the zinc-aluminum oxide layer 4. The NiCr layer 6 is magnetron sputtered on the surface of the second Ag layer 5. The silicon oxide layer 7 is magnetron sputtered on the surface of the NiCr layer 6.
[0023] Solar radiation observed at ground level has a wavelength range of approximately 295nm-2500nm. Solar radiation with wavelengths shorter than 295nm and longer than 2000nm cannot reach the ground due to strong absorption by ozone, water vapor, and other atmospheric molecules in the Earth's atmosphere. Within the 295nm-2000nm band of solar radiation, visible light ranges from 380nm to 780nm, while infrared radiation primarily falls between 780nm and 2000nm. Therefore, the reflectivity of a barrier film in the 780nm-2000nm band directly affects its thermal insulation efficiency.
[0024] The Ag layer has a high reflectivity, reflecting most infrared rays back and allowing less to penetrate, thus achieving effective protection. Existing infrared-blocking films typically utilize a single Ag layer structure, which has poor durability and is prone to oxidation and shedding, thus affecting the protective effect and light transmittance. In the above-described method, the infrared-blocking film, through the laminated structure of the first Ag layer 3, the zinc-aluminum oxide layer 4, and the second Ag layer 5, can improve the infrared reflectivity of the infrared-blocking film, reduce the amount of infrared rays entering the vehicle, and thus achieve a higher thermal insulation rate.
[0025] In one embodiment, the niobium oxide layer 2 can serve as a primer layer to improve the stability of the connection between the first Ag layer 3 and the substrate layer 1 and prevent delamination. Specifically, the thickness of the niobium oxide layer 2 is between 30 nm and 40 nm.
[0026] The thickness of the first Ag layer 3 and the second Ag layer 5 ranges from 10 nm to 15 nm. The first Ag layer is magnetron sputtered onto the surface of the niobium oxide layer 2. The second Ag layer is magnetron sputtered onto the surface of the zinc aluminum oxide layer 4. Both layers effectively reflect infrared radiation in the 780 nm to 2000 nm wavelength range. Preferably, the thickness of the first Ag layer 3 and the second Ag layer 5 can be 12 nm.
[0027] The zinc aluminum oxide layer 4 improves the bonding strength between the first Ag layer 3 and the second Ag layer 5. Furthermore, the zinc aluminum oxide layer 4 exhibits excellent stability at high temperatures, capable of withstanding corrosion and thermal stress in high-temperature environments, while maintaining excellent optical properties. In one embodiment, the zinc aluminum oxide layer 4 has a thickness of 30 nm to 40 nm.
[0028] In one embodiment, the NiCr layer 6 and silicon oxide layer 7 can serve as capping layers for the infrared-blocking film, increasing its durability and making it suitable for a wider range of applications. Specifically, the NiCr layer 6 has a thickness between 1nm and 3nm. The silicon oxide layer 7 has a thickness between 30nm and 40nm.
[0029] In one embodiment, the substrate layer 1 is selected from one of a PET layer, a TAC layer, an SRF layer, a COP layer, and a PC layer. Preferably, the substrate layer 1 is a PET layer. The thickness of the substrate layer 1 may be between 23 μm and 250 μm.
[0030] The present invention will be further described below with reference to specific embodiments and comparative examples.
[0031] Comparative Example 1
[0032] From bottom to top, they are: substrate layer, niobium oxide layer, Ag layer, NiCr layer and silicon oxide layer.
[0033] Substrate layer: PET layer, 50 μm thick. Niobium oxide layer: 30 nm thick. Ag layer: 8 nm thick. NiCr layer: 1 nm thick. Silicon oxide layer: 30 nm thick.
[0034] Comparative Example 2
[0035] From bottom to top, they are: substrate layer, niobium oxide layer, thickened Ag layer, NiCr layer and silicon oxide layer.
[0036] Substrate layer: PET layer, 50 μm thick. Niobium oxide layer: 40 nm thick. Thickened Ag layer: 16 nm thick. NiCr layer: 3 nm thick. Silicon oxide layer: 40 nm thick.
[0037] Example 1
[0038] From bottom to top, there are: substrate layer 1, niobium oxide layer 2, first Ag layer 3, zinc aluminum oxide layer 4, second Ag layer 5, NiCr layer 6 and silicon oxide layer 7.
[0039] Substrate layer 1: PET layer, 50 μm thick. Niobium oxide layer 2: 35 nm thick. First Ag layer 3: 12 nm thick. Zinc aluminum oxide layer 4: 35 nm thick. Second Ag layer 5: 12 nm thick. NiCr layer 6: 2 nm thick. Silicon oxide layer 7: 35 nm thick.
[0040] The transmittance and reflectance of Comparative Examples 1-2 and Example 1 were tested. The test results are shown in Table 1 below.
[0041] Table 1 Test results of transmittance and reflectance of Comparative Examples 1-2 and Example 1
[0042]
[0043] Combined with Table 1 and reference Figure 2 and Figure 3 As can be seen, the barrier films of Comparative Examples 1 and 2 exhibit low visible light absorption, high transmittance, and low visible light reflectance. Furthermore, the barrier films of Comparative Examples 1 and 2 exhibit high infrared transmittance and low infrared reflectance. The infrared-blocking film of Example 1 exhibits high visible light absorption and low transmittance; at the same time, it exhibits high infrared reflectance and low transmittance. Consequently, vehicles equipped with the infrared-blocking film of Example 1 can provide a superior driving experience.
[0044] In summary, the infrared-blocking film of the present invention, through its laminated structure of a first Ag layer 3, a zinc-aluminum oxide layer 4, and a second Ag layer 5, can improve its reflectivity and reduce its transmittance, thereby reducing the amount of infrared radiation entering the vehicle interior and achieving a higher heat insulation rate. Furthermore, this infrared-blocking film for vehicle windows has a lower visible light transmittance, improving both reflectivity and privacy.
[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.
[0046] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. An infrared blocking film for vehicle windows, characterized in that: From bottom to top, they include: substrate layer; a niobium oxide layer, magnetron sputtered on a surface of the substrate layer; a first Ag layer, magnetron sputtered on the surface of the niobium oxide layer; a zinc aluminum oxide layer, magnetron sputtered on the surface of the first Ag layer; a second Ag layer, magnetron sputtered on the surface of the zinc oxide aluminum layer; A NiCr layer magnetron sputtered on the surface of the second Ag layer; and A silicon oxide layer is magnetron sputtered on the surface of the NiCr layer.
2. The infrared blocking film for vehicle windows according to claim 1, characterized in that: The thickness of the niobium oxide layer is between 30 nm and 40 nm.
3. The infrared blocking film for vehicle windows according to claim 1, characterized in that: The thickness of the zinc aluminum oxide layer is between 30 nm and 40 nm.
4. The infrared blocking film for vehicle windows according to claim 1, characterized in that: The thickness of the first Ag layer is between 10 nm and 15 nm.
5. The infrared blocking film for vehicle windows according to claim 1, characterized in that: The thickness of the second Ag layer is between 10 nm and 15 nm.
6. The infrared blocking film for vehicle windows according to claim 1, characterized in that: The NiCr layer is between 1 nm and 3 nm.
7. The infrared blocking film for vehicle windows according to claim 1, characterized in that: The thickness of the silicon oxide layer is between 30 nm and 40 nm.
8. The infrared blocking film for vehicle windows according to claim 1, characterized in that: The thickness of the substrate layer is between 23 μm and 250 μm.
9. The infrared blocking film for vehicle windows according to claim 1, characterized in that: The substrate layer is selected from one of a PET layer, a TAC layer, an SRF layer, a COP layer and a PC layer.