High-weather-resistance low-reflection film

Abstract

The utility model discloses a high-weather-resistant low-reflection film which comprises a base material layer, and a high-hardness coating, a high-adhesive-force coating and an antireflection layer are sequentially arranged on the base material layer in a stacked mode. The surface roughness of the high-adhesion coating ranges from 1.5 nm to 3.0 nm, and the absolute value of the difference value between the refractive index of the high-adhesion coating and the refractive index of the high-hardness coating ranges from 0 to 0.02. The high-weather-resistant low-reflection thin film solves the problem that an existing thin film is poor in weather resistance, and shows excellent weather resistance.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical thin films, and specifically relates to a highly weather-resistant low-reflection thin film. Background Art

[0002] The dry-process AR low-reflection thin film technology is a coating technology widely used on optical elements, aiming to reduce the reflection of light on the surface of the medium, improve the light transmittance, thereby enhancing visual clarity and energy efficiency. It has important applications especially in fields such as spectacle lenses, solar panels, camera lenses, display screens, etc.

[0003] With the progress of materials science and processing technology, the dry-process AR low-reflection thin film technology continues to develop towards higher performance, lower cost, and more environmental protection to meet the growing market demand. However, the existing dry-process AR low-reflection thin films are usually troubled by poor weather resistance in actual use, and the weather resistance needs to be further improved.

[0004] The information disclosed in this background art section is only intended to enhance the overall understanding of the utility model and should not be regarded as an admission or any form of implication that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a highly weather-resistant low-reflection thin film, which solves the problem of poor weather resistance of the existing low-reflection thin films and improves the weather resistance.

[0006] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:

[0007] A highly weather-resistant low-reflection thin film, including a substrate layer, on which a high-hardness coating, a high-adhesion coating, and an antireflection layer are sequentially laminated;

[0008] Wherein, the surface roughness of the high-adhesion coating is 1.5 - 3.0 nm, and the absolute value of the difference between the refractive index of the high-adhesion coating and the refractive index of the high-hardness coating is 0 - 0.02.

[0009] In one or more embodiments of the utility model, the high-adhesion coating is a layer structure including adhesion-enhancing particles, and the adhesion-enhancing particles are silica particles.

[0010] In one or more embodiments of the utility model, the particle size of the adhesion-enhancing particles is 30 - 150 nm.

[0011] In one or more embodiments of the utility model, the refractive index of the high-hardness coating is 1.52 - 1.55.

[0012] In one or more embodiments of the present utility model, the high-hardness coating is an acrylic resin layer with a thickness of 3 - 5 μm.

[0013] In one or more embodiments of the present utility model, the high-adhesion coating is an acrylic resin layer with a thickness of 100 - 300 nm.

[0014] In one or more embodiments of the present utility model, the anti-reflection layer includes multiple sets of stacked structures arranged in sequence. Each set of stacked structure includes a high-refractive-index coating layer and a low-refractive-index coating layer arranged in sequence. The thickness of the anti-reflection layer is 200 - 300 nm.

[0015] In one or more embodiments of the present utility model, the high-refractive-index coating layer is a niobium oxide layer, and the low-refractive-index coating layer is a silicon dioxide layer.

[0016] In one or more embodiments of the present utility model, an AF layer is further provided on the anti-reflection layer, and the thickness of the AF layer is 5 - 10 nm.

[0017] In one or more embodiments of the present utility model, the substrate layer is a PET layer with a thickness of 23 - 125 μm and a total light transmittance > 90%.

[0018] Compared with the prior art, by providing a high-adhesion coating between the high-hardness coating and the anti-reflection layer, the present utility model improves the adhesion between the high-hardness coating and the anti-reflection layer, thereby effectively improving the weather resistance of the low-reflection film. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of a high-weather-resistant low-reflection film in an embodiment of the present utility model.

[0021] Figure 2 It is a microscopic morphology diagram of small particle-size silica distributed in the high-adhesion coating in an embodiment of the present utility model.

[0022] Figure 3 It is a microscopic morphology diagram of large particle-size silica distributed in the high-adhesion coating in an embodiment of the present utility model.

[0023] Main reference numeral description:

[0024] 1. Substrate layer; 2. High-hardness coating; 3. High-adhesion coating; 4. Anti-reflection layer; 5. AF layer. Detailed implementation manners

[0025] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0026] The reasons for the poor weather resistance of low-reflection films mainly include the following factors: 1. Environmental factors: Long-term exposure to the outdoors or harsh environments, such as ultraviolet radiation, high temperature, humidity changes, acid rain, salt spray, etc., can easily cause the film material to age, decompose or corrode, affecting its optical properties and physical stability; 2. Vulnerability of the multi-layer structure: In order to achieve an efficient anti-reflection effect, low-reflection films often have a multi-layer structure designed, but this complex structure may make the film more vulnerable to external factors. For example, interlayer separation or a reduction in the number of a certain layer may affect the overall weather resistance; 3. Adhesion problem: Generally, the AR coating that plays an anti-reflection role in low-reflection films is directly magnetron sputtered on the hardening coating. If the adhesion between the AR coating and the hardening coating is insufficient, over time or under extreme conditions, the film may peel off from the substrate, which is an important factor affecting the weather resistance of the film.

[0027] Based on this, the present utility model increases a high-adhesion coating between the AR coating and the high-hardness coating, and at the same time controls the surface roughness of the high-adhesion coating, so that the adhesion between the AR coating and the high-hardness coating is effectively improved, thereby improving the overall weather resistance of the low-reflection film.

[0028] A specific implementation manner of the present utility model provides a low-reflection film with high weather resistance, such as Figure 1 shown, the low-reflection film with high weather resistance includes a substrate layer 1, and a high-hardness coating 2, a high-adhesion coating 3 and an anti-reflection layer 4 are sequentially stacked on the substrate layer 1; wherein, the surface roughness of the high-adhesion coating 3 is 1.5 - 3.0 nm, and the absolute value of the difference between the refractive index of the high-adhesion coating 3 and the refractive index of the high-hardness coating 2 is 0 - 0.02.

[0029] Specifically, by defining the roughness of the high-adhesion coating 3, it helps the anti-reflection layer 4 to firmly adhere to the coating surface, thereby reducing the possibility of interlayer separation or even peeling, and enabling the low-reflection film to have better weather resistance. During specific preparation, both the high-hardness coating 2 and the high-adhesion coating 3 are formed by a precision wet coating process. In addition, the refractive index of the high-adhesion coating 3 is similar to that of the high-hardness coating 2, which can avoid the occurrence of a refraction surface and affect the optical effect.

[0030] In a specific embodiment, the high-adhesion coating is a layer structure including adhesion-enhancing particles. The adhesion-enhancing particles are silica particles, and the particle size of the adhesion-enhancing particles is 30 - 150 nm.

[0031] Specifically, adding silica particles to the high-adhesion coating 3 can increase the surface roughness of the high-adhesion coating 3. The addition ratio of silica particles in the high-adhesion coating 3 is 20 - 50% by weight. The silica particles can form tiny protrusions in the coating. These tiny protrusions can provide more surface area, which helps the anti-reflection layer 4 to be better mechanically anchored on the coating surface, thereby improving the adhesion of the anti-reflection layer 4. In addition, the uniform distribution of silica particles in the coating can form tiny mechanical anchor points, which can increase the physical bonding force between the anti-reflection layer 4 and the coating, preventing the anti-reflection layer 4 from peeling or separating during use. Silica particles also help to improve the thickness and uniformity of the coating, thereby ensuring the uniform adhesion between the anti-reflection layer 4 and the coating. At the same time, the silica particles themselves have a certain hardness and wear resistance, which can improve the overall hardness and wear resistance of the coating, be beneficial to protecting the coating and the anti-reflection layer 4 from mechanical damage, and also help to enhance the bonding force between the coating and the anti-reflection layer 4.

[0032] Furthermore, by defining the particle size of the silica particles, it promotes the uniform distribution of the silica particles in the coating, which helps to form mechanical anchor points on the coating surface, thereby improving the roughness and uniformity of the coating surface. The distribution state of adding silica with a smaller particle size to the high-adhesion coating formed by acrylic resin is as Figure 2 shown, and the distribution state of adding silica with a larger particle size to the high-adhesion coating formed by acrylic resin is as Figure 3 shown.

[0033] In a specific embodiment, the refractive index of the high-hardness coating 2 is 1.52 - 1.55, the high-hardness coating 2 is an acrylic resin layer with a thickness of 3 - 5 μm; the high-adhesion coating 3 is an acrylic resin layer with a thickness of 100 - 300 nm.

[0034] Specifically, by controlling the thickness of the high-hardness coating 2 and the high-adhesion coating 3, the optical properties of the low-reflection film can be ensured.

[0035] In a specific embodiment, the antireflection layer 4 includes multiple sets of stacked structures arranged in sequence. Each set of stacked structures includes a high-refractive-index coating layer and a low-refractive-index coating layer arranged in sequence. The thickness of the antireflection layer 4 is 200 - 300 nm; the high-refractive-index coating layer is a niobium oxide layer, and the low-refractive-index coating layer is a silicon dioxide layer.

[0036] Specifically, niobium oxide and silicon dioxide can increase the refractive index of the thin film, reduce light reflection, and achieve the antireflection effect of the thin film. According to actual requirements, the niobium oxide layer and the silicon dioxide layer can be combined into multiple layers to form the antireflection layer 4, so as to better improve the antireflection effect of the low-reflection thin film.

[0037] In a specific embodiment, an AF layer 5 is further provided on the antireflection layer 4, and the thickness of the AF layer 5 is 5 - 10 nm.

[0038] Specifically, the AF layer 5 is an anti-fingerprint and anti-scratch layer, and its main component is perfluoropolyether polymer. Spraying a layer of AF layer 5 on the antireflection layer 4 can reduce the residue of fingerprints and oil stains on the surface of the thin film, improve the use stability of the thin film, and further improve the weather resistance of the thin film.

[0039] In a specific embodiment, the substrate layer 1 is a PET layer with a thickness of 23 - 125 μm and a total light transmittance > 90%.

[0040] Specifically, PET is polyethylene terephthalate, which has a high optical transmittance and can ensure the light transmittance of the low-reflection thin film.

[0041] The following further details the present utility model in conjunction with specific embodiments.

[0042] Example 1

[0043] A low-reflection thin film with high weather resistance, including a PET layer with a thickness of 23 μm, a high-hardness coating layer with a thickness of 5 μm, a high-adhesion coating layer with a thickness of 150 nm, an antireflection layer with a thickness of 200 nm, and an AF layer with a thickness of 6 nm, which are arranged in sequence and stacked.

[0044] Among them, the antireflection layer includes a niobium oxide layer with a thickness of 60 nm, a silicon dioxide layer with a thickness of 40 nm, a niobium oxide layer with a thickness of 60 nm, and a silicon dioxide layer with a thickness of 40 nm, which are sequentially stacked on the high-hardness coating layer; both the high-hardness coating layer and the high-adhesion coating layer are acrylic resin layers, and their refractive indices are both 1.52; the high-adhesion coating layer contains silicon dioxide particles, and the addition ratio of the silicon dioxide particles in the acrylic resin is 25 wt%, and the surface roughness of the high-adhesion coating layer is 1.5 nm.

[0045] Example 2

[0046] High weather-resistant low-reflection film, including a PET layer of 50 μm, a high-hardness coating of 4 μm, a high-adhesion coating of 200 nm, an antireflection layer of 250 nm, and an AF layer of 8 nm, which are sequentially stacked.

[0047] Among them, the antireflection layer includes a niobium oxide layer of 70 nm, a silica layer of 55 nm, a niobium oxide layer of 70 nm, and a silica layer of 55 nm, which are sequentially stacked on the high-hardness coating; both the high-hardness coating and the high-adhesion coating are acrylic resin layers, and their refractive indices are both 1.53; the high-adhesion coating contains silica particles, and the addition ratio of the silica particles in the acrylic resin is 30 wt%, and the surface roughness of the high-adhesion coating is 2.0 nm.

[0048] Example 3

[0049] High weather-resistant low-reflection film, including a PET layer of 125 μm, a high-hardness coating of 3 μm, a high-adhesion coating of 250 nm, an antireflection layer of 250 nm, and an AF layer of 10 nm, which are sequentially stacked.

[0050] Among them, the antireflection layer includes a niobium oxide layer of 70 nm, a silica layer of 55 nm, a niobium oxide layer of 70 nm, and a silica layer of 55 nm, which are sequentially stacked on the high-hardness coating; both the high-hardness coating and the high-adhesion coating are acrylic resin layers, and their refractive indices are both 1.54; the high-adhesion coating contains silica particles, and the addition ratio of the silica particles in the acrylic resin is 40 wt%, and the surface roughness of the high-adhesion coating is 3.0 nm.

[0051] Comparative Example 1

[0052] High weather-resistant low-reflection film, including a PET layer of 50 μm, a high-hardness coating of 4 μm, an antireflection layer of 250 nm, and an AF layer of 8 nm, which are sequentially stacked.

[0053] Among them, the antireflection layer includes a niobium oxide layer of 70 nm, a silica layer of 55 nm, a niobium oxide layer of 70 nm, and a silica layer of 55 nm, which are sequentially stacked on the high-hardness coating; the high-hardness coating is an acrylic resin layer, and the refractive index of the high-hardness coating is 1.53.

[0054] The film samples in each example and Comparative Example 1 were subjected to the following tests:

[0055] (1) High-temperature and high-humidity test: Place the film in an environment with a temperature of 85% and a humidity of 85%, observe whether there is peeling between the layers of the film, judge whether the adhesion is OK, and record the time.

[0056] (2) UV test: Place the film in an environment of the UV ultraviolet band (340 - 365 nm), observe whether there is peeling between the layers of the film, judge whether the adhesion is OK, and record the time.

[0057] (3) Thermal shock test: Place the film material in a thermal shock environment (high temperature 80°C, low temperature -40°C, 1 hour for each cycle), observe whether there is peeling between layers of the film material, judge whether the adhesion is okay, and record the time.

[0058] (4) Sweat resistance wiping test: Wipe with standard artificial sweat. The pH value of the artificial sweat is 4.7. Continuously drip artificial sweat on the lint-free cloth during the wiping process, observe the wear condition of the film, judge whether the adhesion is okay, and record the time.

[0059] Table 1 Performance test results

[0060]

[0061]

[0062] As can be seen from Table 1, compared with Comparative Example 1 without a high-adhesion coating, the film material in the embodiment of the present utility model exhibits better weather resistance. It can be placed for up to 12 days in a high-temperature and high-humidity environment, up to 8 days in an ultraviolet environment, up to 40 cycles in the thermal shock test, and up to 1200 wipes in the sweat resistance wiping test. There is no peeling between layers of the film material, and the adhesion between layers is good.

[0063] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0064] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A highly weather-resistant low-reflection film, characterized in that, It includes a substrate layer, on which a high-hardness coating, a high-adhesion coating and an anti-reflection layer are sequentially laminated; Among them, the surface roughness of the high-adhesion coating is 1.5 to 3.0 nm; The absolute value of the difference between the refractive index of the high-adhesion coating and the refractive index of the high-hardness coating is 0 to 0.

02.

2. The highly weather-resistant low-reflection film according to claim 1, wherein, The high-adhesion coating is a layer structure including adhesion-enhancing particles, and the adhesion-enhancing particles are silica particles.

3. The highly weather-resistant low-reflection film according to claim 2, wherein The particle size of the adhesion-enhancing particles is 30 to 150 nm.

4. The highly weather-resistant low-reflection film according to claim 1, wherein, The refractive index of the high-hardness coating is 1.52 to 1.

55.

5. The highly weather-resistant low-reflection film according to claim 1, characterized in that, The high-hardness coating is an acrylic resin layer with a thickness of 3 to 5 μm.

6. The highly weather-resistant low-reflection film according to claim 1, wherein The high-adhesion coating is an acrylic resin layer with a thickness of 100 to 300 nm.

7. The highly weather-resistant low-reflection film according to claim 1, characterized in that, The anti-reflection layer includes multiple sets of laminated structures arranged sequentially. Each set of laminated structures includes a high-refractive-index coating layer and a low-refractive-index coating layer arranged in sequence. The thickness of the anti-reflection layer is 200 to 300 nm.

8. The highly weather-resistant low-reflection film according to claim 7, wherein The high-refractive-index coating layer is a niobium oxide layer, and the low-refractive-index coating layer is a silica layer.

9. The highly weather-resistant low-reflection film according to claim 1, characterized in that, An AF layer is further provided on the anti-reflection layer, and the thickness of the AF layer is 5 to 10 nm.

10. The highly weather-resistant low-reflection film according to claim 1, characterized in that, The substrate layer is a PET layer with a thickness of 23 to 125 μm and a total light transmittance > 90%.

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