Dimming film

Abstract

The invention discloses a dimming film which comprises a base material layer, a first coating layer, a second coating layer, a priming layer, a NiCr layer, a SiO2 layer, a first ITO layer and a second ITO layer. The base material layer is provided with a first surface and a second surface which are oppositely arranged; the first coating layer is coated on the first surface; the second coating layer is coated on the second surface; the priming layer is plated on the second coating layer; the NiCr layer is plated on the base layer and is used for controlling the reflection color of the dimming film; the SiO2 layer is arranged on the NiCr layer in a plating manner; the first ITO layer is plated on the surface of the SiO2 layer; the second ITO layer is plated on the surface of the first ITO layer, and the first ITO layer and the second ITO layer have different indium-tin doping proportions. According to the dimming film, the NiCr layer is adopted to replace a TiO2 layer in the prior art, and on the basis that the performance of an existing dimming film is not reduced, the cost is reduced, and the production efficiency is improved. In addition, the dimming film adopts the two ITO layers, so that the dimming film can have better crystallization performance.

Description

Technical Field

[0001] The invention belongs to the technical field of film materials, and in particular relates to a dimming film. Background Art

[0002] The dimming film can be used in scenes such as car sunroofs, side windows, rearview mirrors, and architectural glass. The optical properties of the material need to be able to control the color change phenomenon under the action of an external electric field. When the sunlight becomes very dazzling, the dimming film can turn black, but if you want to see the scenery outside, you can adjust the dimming film to be transparent to increase the light transmittance. Therefore, it can respond to external conditions to change different brightness, such as sunrise, sunset, cloudy and rainy days, sunny days, etc. In the state of strong sunlight, it can block most of the sunlight and heat like a parasol, quickly adjust the total amount of light entering the car, and provide a clear external view. The color-changing dimming film plays an important role in improving the driving experience, improving the comfort of drivers and passengers, and adjusting the brightness of the car. The existing dimming film has a high manufacturing cost and low production efficiency, which is not conducive to mass production and application.

[0003] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0004] An object of the present invention is to provide a dimming film which can reduce costs and improve production efficiency without reducing the performance of the dimming film.

[0005] In order to achieve the above-mentioned purpose, a technical solution provided by a specific embodiment of the present invention is as follows: a dimming film, comprising: a substrate layer, a first coating layer, a second coating layer, a primer layer, a NiCr layer, a SiO2 layer, a first ITO layer and a second ITO layer. The substrate layer has a first surface and a second surface arranged opposite to each other; the first coating layer is coated on the first surface; the second coating layer is coated on the second surface; the primer layer is plated on the second coating layer; the NiCr layer is plated on the primer layer for controlling the reflective color of the dimming film; the SiO2 layer is plated on the NiCr layer; the first ITO layer is plated on the surface of the SiO2 layer; the second ITO layer is plated on the surface of the first ITO layer, and the first ITO layer and the second ITO layer have different indium tin doping ratios.

[0006] In one or more embodiments of the present invention, the mass ratio of indium in the first ITO layer is between 80% and 99%, and the mass ratio of tin is between 1% and 20%.

[0007] In one or more embodiments of the present invention, the mass ratio of indium in the second ITO layer is between 85% and 98%, and the mass ratio of tin is between 2% and 15%.

[0008] In one or more embodiments of the present invention, the thickness of the first ITO layer and the second ITO layer is between 100 nm and 400 nm.

[0009] In one or more embodiments of the present invention, the thickness of the NiCr layer is between 0.5 nm and 30 nm.

[0010] In one or more embodiments of the present invention, the thickness of the SiO2 layer is between 1 nm and 20 nm.

[0011] In one or more embodiments of the present invention, the coating layer is selected from SiO2, Si, Al2O3, MgF2, SiO, HfO2, SnO2 and Y2O3; and / or, the thickness of the coating layer is between 0.2nm-20nm.

[0012] In one or more embodiments of the present invention, the thickness of the first coating layer is between 20 nm and 900 nm; the thickness of the second coating layer is between 40 nm and 1200 nm.

[0013] In one or more embodiments of the present invention, the substrate layer is selected from one of PET, PI, TAC, COP and PC; and / or the thickness of the substrate layer is between 5.7 μm and 570 μm.

[0014] In one or more embodiments of the present invention, a first PET layer is disposed on a side of the first coating layer away from the substrate layer; a second PET layer is disposed on the surface of the second ITO layer; and the thickness of the first PET layer and the second PET layer is between 30 μm and 188 μm.

[0015] Compared with the prior art, the dimming film of the present invention uses a NiCr layer to replace a TiO2 layer, which reduces the cost and improves the production efficiency without reducing the performance of the existing dimming film. In addition, by using two ITO layers, the dimming film can have better crystallization performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0017] Figure 1 is a schematic diagram of a dimming film according to an embodiment of the present invention;

[0018] Figure 2It is a reflectivity curve diagram of comparative example 1 and example 1 in one embodiment of the present invention;

[0019] Figure 3 It is a transmittance curve diagram of comparative example 1 and example 1 in one embodiment of the present invention.

[0020] Description of main reference numerals:

[0021] 1-substrate layer, 2-first coating layer, 3-second coating layer, 4-priming layer, 5-NiCr layer, 6-SiO2 layer, 7-first ITO layer, 8-second ITO layer, 9-first PET layer, 10-second PET layer. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments 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 creative work should fall within the scope of protection of the present invention.

[0023] like Figure 1 As shown, a dimming film in one embodiment of the present invention includes a substrate layer 1, a first coating layer 2, a second coating layer 3, a primer layer 4, a NiCr layer 5, a SiO2 layer 6, a first ITO layer 7 and a second ITO layer 8. The substrate layer 1 has a first surface and a second surface arranged opposite to each other. The first coating layer 2 is coated on the first surface. The second coating layer 3 is coated on the second surface. The primer layer 4 is plated on the second coating layer 3. The NiCr layer 5 is plated on the primer layer 4 to control the reflective color of the dimming film. The SiO2 layer 6 is plated on the NiCr layer 5. The first ITO layer 7 is plated on the surface of the SiO2 layer 6. The second ITO layer 8 is plated on the surface of the first ITO layer 7, and the first ITO layer 7 and the second ITO layer 8 have different indium tin doping ratios.

[0024] The dimming film in the prior art is usually coated with TiO2 on the surface of the base layer 4, and the dimming film obtained in this way is high in cost and low in production efficiency. In the above embodiment, the dimming film of the present invention uses a NiCr layer 5 to replace the TiO2 layer, and oxygen does not need to be introduced during the preparation process. On the basis of not reducing the performance of the existing dimming film, the cost is reduced and the production efficiency is improved.

[0025] In one embodiment, the dimming film is provided with a first ITO layer 7 and a second ITO layer 8. The first ITO layer 7 and the second ITO layer 8 have different indium-tin doping ratios. Specifically, the mass ratio of indium in the first ITO layer 7 is between 80% and 99%, and the mass ratio of tin is between 1% and 20%. The mass ratio of indium in the second ITO layer 8 is between 85% and 98%, and the mass ratio of tin is between 2% and 15%.

[0026] In the prior art, when a single-layer ITO layer ages and crystallizes, non-crystallization may occur. Compared with a single-layer ITO layer, a two-layer ITO layer has better crystallization performance, thereby improving the compactness of the dimming film coating. In addition, the first ITO layer 7 and the second ITO layer 8 can also increase the conductivity of the dimming film, making the dimming film easier to control.

[0027] Furthermore, the thickness of the first ITO layer 7 and the second ITO layer 8 is between 100 nm and 400 nm.

[0028] In one embodiment, the thickness of the NiCr layer 5 is between 0.5 nm and 30 nm. The NiCr layer 5 is plated on the base layer 4 and can be used to control the color of the dimming film, so that the color of the dimming film can be controlled between neutral color (and black) or cool color (and bluish).

[0029] The SiO2 layer 6 is plated on the surface of the NiCr layer 5 to reduce the reflectivity of the dimming film. Specifically, the thickness of the SiO2 layer 6 is between 1 nm and 20 nm.

[0030] A primer layer 4 is provided between the NiCr layer 5 and the substrate layer 1 to improve the adhesion between the NiCr layer 5. In one embodiment, the primer layer 4 is selected from SiO2, Si, Al2O3, MgF2, SiO, HfO2, SnO2 and Y2O3. Further, the thickness of the primer layer 4 can be between 0.2nm and 20nm.

[0031] In one embodiment, the substrate layer 1 is selected from one of PET, PI, TAC, COP and PC. The thickness of the substrate layer 1 may be between 5.7 μm and 570 μm.

[0032] The first surface and the second surface of the substrate layer 1 are coated with a low-refractive acrylic resin coating liquid to form a first coating layer 2 and a second coating layer 3. The thickness of the first coating layer 2 can be between 20nm and 900nm; the thickness of the second coating layer 3 can be between 40nm and 1200nm.

[0033] Furthermore, a first PET layer 9 is provided on the side of the first coating layer 2 away from the substrate layer 1. A second PET layer 10 is provided on the surface of the second ITO layer 8. The thickness of the first PET layer 9 and the second PET layer 10 is between 30 μm and 188 μm. Among them, the first PET layer 9 can ensure the protection of the film surface appearance and the stability of the coating during the magnetron sputtering coating process. The second PET layer 10 can protect the appearance of the film surface after the dimming film is prepared.

[0034] The dimming film is prepared by dry magnetron vacuum coating sputtering method, and the vacuum degree is less than 1.0×10 -4 pa, water vapor value is less than 9.0×10 -5 pa or less. The target material is a rotating target, which improves the overall utilization rate of the target material compared to the planar target, and the rotating target sputters at a uniform speed, which is more stable than the fixed orbit sputtering of the planar target. The gas bombarding the target material is argon, and the target material reaction gas is a mixed gas of argon, krypton, nitrogen, and oxygen (for example, argon accounts for 30-60%, krypton accounts for 60-80%, nitrogen accounts for 20-35%, and oxygen accounts for 5-10%). The reaction gas is selected as a mixed gas to effectively solve the uniformity of sputtering on the target surface and improve the overall optical stability after superposition. After the magnetron coating is completed and aged in an oven, the square resistance can be between 5-10Ω.

[0035] The present invention is further described below in conjunction with specific embodiments and comparative examples.

[0036] Example 1

[0037] First PET layer 9: 50 μm;

[0038] First coating layer 2: thickness 40 nm;

[0039] Substrate layer 1: PET layer, thickness 10 μm;

[0040] Second coating layer 3: thickness 60 nm;

[0041] Bottom layer 4: Al2O3 layer, thickness 2nm;

[0042] NiCr layer 5: thickness 5 nm;

[0043] SiO2 layer 6: 10nm;

[0044] First ITO layer 7: 200nm;

[0045] Second ITO layer 8: 200nm;

[0046] Second PET layer 10: 50 μm.

[0047] Comparative Example 1

[0048] First PET layer: 50 μm;

[0049] First coating layer: thickness 40nm;

[0050] Substrate layer: PET layer, thickness 10 μm;

[0051] Second coating layer: thickness 60nm;

[0052] Bottom layer: Al2O3 layer, thickness 2nm;

[0053] TiO2 layer: thickness 5nm;

[0054] SiO2 layer: 10nm;

[0055] ITO layer: 200nm;

[0056] Second PET layer: 50 μm.

[0057] The dimming films of Example 1 and Comparative Example 1 were prepared by the above-mentioned preparation method. Two dimming films of Example 1 and Comparative Example 1 were prepared. The two dimming films of Example 1 and the two dimming films of Comparative Example 1 were tested. The dimming films of Example 1 and Comparative Example 1 were tested for reflectivity, transmittance, color, warpage, square resistance and grid.

[0058] The test method for reflectivity and transmittance is as follows: before testing, the back of the dimming film of Example 1 and Comparative Example 1 is adhered with OCA glue and attached to a black acrylic plate. After bonding, a degassing machine is used to degas. After degassing, the surface is wiped clean and tested.

[0059] The test results are as follows Figure 2 and Figure 3 As shown. The average reflectance of the dimming films of Example 1 and Comparative Example 1 at 380-780nm is: Example 1: 10.04%; Comparative Example 1: 9.78%. The difference between the average reflectance of the two is not large, and the reflection effect is similar. The average transmittance is: Example 1: 69.64%, Comparative Example 1: 81.41%.

[0060] It can be seen from the above results that the transmittance of Example 1 is lower than that of Comparative Example 1. However, since the transmittance requirement of the dimming film is not particularly high, the decrease in transmittance has almost no effect on the overall performance of the dimming film.

[0061] Color performance can be directly observed and judged by the human eye. The results are as follows: Example 1: a* value -0.76%, b* value -0.2%, the color is neutral. Comparative Example 1: a* value -1.93%, b* value -0.33%, the color is neutral. (Here: a* value represents red and green, a* value '+' means red-oriented color, a* value '-' means green-oriented color; b* value represents yellow and blue, b* value '+' means yellow-oriented color, b* value '-' means blue-oriented color).

[0062] It can be seen from the above results that the color performance of Example 1 and Comparative Example 1 is similar.

[0063] The square resistance test method is as follows: when testing the square resistance, the two dimming films of Example 1 and the two dimming films of Comparative Example 1, a total of 4 samples, are placed flat on the table with the film surface facing up, and the surface square resistance is tested with a square resistance meter. The film width is 1200mm and is divided into three sections: F / C / B. The square resistance of 10 points BA (before aging) and AA (after oven aging) is evenly tested. The resistance value after crystallization after coating aging is required to be 7.5±2.5Ω.

[0064] The test results are shown in Table 1 below.

[0065] Table 1 Square resistance test results of Example 1 and Comparative Example 1

[0066]

[0067] As shown in Table 1, the lowest average square resistance of AA in Comparative Example 1 is 7.8Ω, and the highest is 7.9Ω; the lowest average square resistance of AA in Example 1 is 7.6Ω, and the highest is 7.8Ω. Therefore, the square resistance values ​​of the dimming films in Comparative Example 1 and Example 1 are both within the standard range.

[0068] Warping test method: Two dimming films of Example 1 and two dimming films of Comparative Example 1, a total of 4 samples, divided into three sections of F / C / B, with a specification of 340*340mm. Heating conditions: 150℃, 5min. During baking, there is no second PET layer, but the first PET layer, and the coated surface faces up. After baking, when the oven temperature drops below 70℃, take out the samples and test the warping degree of the 4 corners of each sample. Test requirements: upper warping height ≤20mm; lower warping height ≤-10mm. The test results are shown in Table 2 below.

[0069] Table 2 Warpage test results of Example 1 and Comparative Example 1

[0070]

[0071]

[0072] As shown in Table 2 above, the warping degrees of the dimming films of Comparative Example 1 and Example 1 are similar and are both within the standard range.

[0073] The test method is as follows: the dimming film of Example 1 and the dimming film of Comparative Example 1 are bonded with OCA glue on the front and back sides, and then attached to transparent glass. After bonding, a degassing machine is used to degas. After degassing, the surface is wiped clean and tested by boiling in 100°C water for 1-2 hours. Double 85 ring test (high temperature 85°C, high humidity 85%) for 8-10 days. High temperature ring test (95°C) for 8-10 days. Low temperature ring test (-40°C) for 8-10 days. Sunlight resistance ring test (light 0.55w / (m 2 .nm), wavelength 340nm, filter ExtendedUV-Q / B, 3.8h light + 1h dark for 1 cycle, light blackboard temperature set to 89℃, box temperature 63℃, humidity 50%; dark stage set box, blackboard temperature 38℃, humidity 95%), 8-10 days. The test results are shown in Table 3 below.

[0074] Table 3 100-grid test results of the dimming film of Example 1 and Comparative Example 1

[0075]

[0076] It can be seen from Table 3 above that there is no shedding in the hundred-grid test of Example 1 and Comparative Example 1, and the ring test performance is qualified.

[0077] In summary, the dimming film of the present invention uses NiCr layer 5 to replace the TiO2 layer in the prior art, which reduces the cost and improves the production efficiency without reducing the performance of the existing dimming film. In addition, by using two ITO layers, it can have better crystallization performance.

[0078] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0079] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description 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 may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A dimming film, characterized in that: include: A substrate layer having a first surface and a second surface opposite to each other; A first coating layer, coated on the first surface; A second coating layer, coated on the second surface; A base layer, plated on the second coating layer; A NiCr layer, plated on the base layer, for controlling the reflective color of the dimming film; A SiO2 layer, plated on the NiCr layer; A first ITO layer is plated on the surface of the SiO2 layer; and The second ITO layer is plated on the surface of the first ITO layer, and the first ITO layer and the second ITO layer have different indium tin doping ratios.

2. The dimming film according to claim 1, characterized in that: The mass ratio of indium in the first ITO layer is between 80% and 99%, and the mass ratio of tin is between 1% and 20%.

3. The dimming film according to claim 1, characterized in that: The mass ratio of indium in the second ITO layer is between 85% and 98%, and the mass ratio of tin is between 2% and 15%.

4. The dimming film according to claim 1, characterized in that: The thickness of the first ITO layer and the second ITO layer is between 100 nm and 400 nm.

5. The dimming film according to claim 1, characterized in that: The thickness of the NiCr layer is between 0.5 nm and 30 nm.

6. The dimming film according to claim 1, characterized in that: The thickness of the SiO2 layer is between 1nm and 20nm.

7. The dimming film according to claim 1, characterized in that: The coating layer is selected from SiO2, Si, Al2O3, MgF2, SiO, HfO2, SnO2 and Y2O3; and / or, the thickness of the coating layer is between 0.2nm and 20nm.

8. The dimming film according to claim 1, characterized in that: The thickness of the first coating layer is between 20nm and 900nm; the thickness of the second coating layer is between 40nm and 1200nm.

9. The dimming film according to claim 1, characterized in that: The substrate layer is selected from one of PET, PI, TAC, COP and PC; and / or the thickness of the substrate layer is between 5.7 μm and 570 μm.

10. The dimming film according to claim 1, characterized in that: A first PET layer is disposed on a side of the first coating layer away from the substrate layer; a second PET layer is disposed on the surface of the second ITO layer; and the thickness of the first PET layer and the second PET layer is between 30 μm and 188 μm.

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