Anti-fingerprint film

Abstract

The utility model discloses an anti-fingerprint film which comprises a base material layer, a high surface tension layer and an anti-fingerprint layer which are sequentially stacked, and the surface energy of the high surface tension layer is 40mJ / m < 2 >-120mJ / m < 2 >. According to the utility model, the high surface tension layer is arranged between the base material layer and the anti-fingerprint layer, so that the formation of bubbles in the coating process of the anti-fingerprint layer is reduced, the generation of bubble-shaped point defects is reduced, and the yield of products is improved.

Description

Anti-fingerprint film Technical Field

[0001] This utility model belongs to the field of optical thin film technology, specifically relating to an anti-fingerprint film. Background Technology

[0002] Anti-fingerprint (AF) technology is a surface treatment technology based on the lotus effect. By coating the material surface with a low surface energy coating, the surface tension is significantly reduced, thereby reducing the adhesion of fingerprints, oil stains and other dirt, while improving cleaning efficiency and durability.

[0003] The origins of autofocus (AF) technology can be traced back to research on the lotus leaf effect. Scientists mimicked the micro- and nano-structures of the lotus leaf surface to develop nano-coatings with self-cleaning properties. With technological advancements, AF technology has gradually been applied to various fields, including consumer electronics, automobiles, and construction. In consumer electronics, AF technology was first used to prevent fingerprints on smartphone screens, solving the problem of fingerprint residue easily remaining on glass covers. Subsequently, AF technology has been extended to devices such as tablets, television displays, and camera lenses.

[0004] In the automotive industry, autofocus (AF) technology is widely used in areas such as center consoles, sunroofs, and side windows to effectively prevent fingerprints and stains. Furthermore, AF technology is also applied to architectural glass and curtain walls, enhancing the aesthetics and ease of cleaning of buildings.

[0005] Existing anti-fingerprint (AF) films are typically manufactured using a precision wet coating process. The coating solution used in this process is generally a fluorinated coating solution. Fluorinated coating solutions have lower surface tension, which makes it easier for bubbles to form. This is because reduced surface tension increases the intermolecular distance within the liquid, making it easier for gas to form bubbles. Therefore, fluorinated coating solutions are prone to bubble formation during the coating process, and these bubbles are difficult to eliminate, resulting in bubble-like defects in the coating and reducing the final product yield.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide an anti-fingerprint film that can reduce the generation of bubble-like defects and improve product yield.

[0008] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0009] An anti-fingerprint film includes a substrate layer, a high surface tension layer, and an anti-fingerprint layer stacked sequentially, wherein the surface energy of the high surface tension layer is 40 mJ / m². 2 ~120mJ / m 2 .

[0010] In one or more embodiments of this utility model, the high surface tension layer material is selected from silicon oxide, aluminum oxide, titanium oxide, zirconium oxide, and magnesium oxide.

[0011] In one or more embodiments of this utility model, the high surface tension material is defined as at least one of the following, depending on the different surface energies:

[0012] Silicon oxide has a surface energy of 40 mJ / m 2 ~80mJ / m 2 ;

[0013] Alumina has a surface energy of 70 mJ / m 2 ~120mJ / m 2 ;

[0014] Titanium oxide has a surface energy of 50 mJ / m 2 ~100mJ / m 2 ;

[0015] Zirconia has a surface energy of 60 mJ / m 2 ~110mJ / m 2 ;

[0016] Magnesium oxide has a surface energy of 80 mJ / m 2 ~120mJ / m 2 .

[0017] In one or more embodiments of this utility model, the thickness of the high surface tension layer is 5nm to 10nm.

[0018] In one or more embodiments of this utility model, the anti-fingerprint layer is formed by a fluorine-containing coating liquid and has a thickness of 3μm to 5μm.

[0019] In one or more embodiments of this utility model, the substrate layer is a PET substrate.

[0020] In one or more embodiments of this utility model, the thickness of the substrate layer is 50 μm to 200 μm.

[0021] In one or more embodiments of this utility model, the total light transmittance of the substrate layer is greater than 90%.

[0022] Compared with the prior art, this utility model adds a high surface tension layer between the substrate layer and the anti-fingerprint layer. Through the high surface tension layer's high wettability and spreadability of the coating liquid, air retention is reduced and bubble bursting is accelerated, thereby effectively reducing the generation of bubble-like defects during the coating process and effectively improving the yield of the final product. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 is a schematic diagram of the contact angle θ formed by the liquid on the surface of the substrate in one embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of the structure of the anti-fingerprint film in one embodiment of the present invention.

[0026] Explanation of key figure labels:

[0027] 1. Substrate layer; 2. High surface tension layer; 3. Anti-fingerprint layer. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0029] The greater the surface tension of a liquid, the stronger the cohesive force between liquid molecules, and the higher the energy required to form a bubble. A bubble is essentially a structure where a liquid film encloses a gas. When the surface tension is high, the liquid film will contract rapidly due to intermolecular forces, making it difficult for the bubble to exist stably. For example, the surface tension of pure water is 72.5 × 10⁻⁶. -3 N / m is much higher than that of soapy water (approximately 24 × 10 N / m). -3 Pure water has a low surface tension (N / m), making it difficult for it to form bubbles, while soapy water is more likely to foam due to its low surface tension. AF-HC coating solution is a fluorinated coating solution with low surface tension, making it easier to form bubbles.

[0030] High surface tension substrates may reduce bubble formation through the following methods:

[0031] (1) Reduce air retention: When the coating liquid has good wettability, the liquid is easier to spread evenly, reducing the probability of air being trapped during the coating process.

[0032] (2) Accelerates bubble rupture: The high surface tension liquid film shrinks quickly, and even if bubbles are formed, they will rupture rapidly and are difficult to remain in the coating.

[0033] Referring to Figure 1, based on Young's equation: Where γliquid is the surface tension of the liquid, γsubstrate is the surface tension of the substrate, and γinterface is the interfacial tension between the liquid and the substrate, the following conclusions can be drawn:

[0034] (1) High surface tension substrate (large γ substrate): When the surface tension of the substrate is large, the contact angle θ approaches 0°, and the liquid can spread completely to form a continuous liquid film. In this case, the micro-depressions on the substrate surface will hardly trap gas, thus significantly reducing the probability of gas trapping.

[0035] (2) Low surface tension substrate (small γ substrate): When the surface tension of the substrate is low, the contact angle θ is greater than 90°, and the liquid cannot completely wet the substrate, causing gas to accumulate at the liquid-solid interface and form bubbles. This phenomenon is common in the fields of coatings and coatings.

[0036] (3) Relationship between wetting and gas retention: The better the wetting, the higher the degree of liquid spread on the substrate, and the lower the probability of gas retention. For example, in coatings, the role of substrate wetting agents is to improve wettability by reducing the contact angle of the liquid on the substrate surface, thereby reducing the formation of bubbles.

[0037] As shown in Figure 2, a specific embodiment of this utility model provides an anti-fingerprint film, comprising a substrate layer 1, a high surface tension layer 2, and an anti-fingerprint layer 3 stacked sequentially, wherein the surface energy of the high surface tension layer 2 is 40 mJ / m². 2 ~120mJ / m 2 .

[0038] Specifically, this invention adds a high surface tension layer between the substrate layer and the anti-fingerprint layer (AF-HC layer) to improve the wetting and spreading properties of the coating liquid, reduce the generation of bubbles, and improve the product yield.

[0039] Furthermore, the substrate layer is a PET (polyethylene terephthalate) substrate with a thickness of 50μm to 200μm. Specifically, thicknesses of 50μm, 100μm, 125μm, and 188μm can be selected. Based on the light transmittance of the film, a PET substrate with a total light transmittance of over 90% is preferred.

[0040] Furthermore, the high surface tension layer has a thickness of 5nm to 10nm, and the specific materials used can be silicon oxide (SiO2), aluminum oxide (Al2O3), titanium oxide (TiO2), zirconium oxide (ZrO2), or magnesium oxide (MgO). The surface energy of silicon oxide is 40mJ / m. 2 ~80mJ / m 2 The surface energy of alumina is 70 mJ / m 2 ~120mJ / m 2 The surface energy of titanium oxide is 50 mJ / m 2 ~100mJ / m 2 The surface energy of zirconium oxide is 60 mJ / m 2 ~110mJ / m 2 The surface energy of magnesium oxide is 80 mJ / m 2 ~120mJ / m 2 .

[0041] Furthermore, the anti-fingerprint layer (AF-HC layer) is formed by a fluorine-containing coating liquid, specifically Arakawa Chemical CH410, with a thickness of 3μm to 5μm.

[0042] The present invention will be further described in detail below with reference to specific embodiments.

[0043] Example 1

[0044] A PET substrate with a thickness of 100μm is selected. A 5nm thick silicon oxide (SiO2) layer is deposited on the PET substrate using a magnetron sputtering process as a high surface tension layer. Then, a 4μm thick AF-HC layer is coated on the high surface tension layer using a precision wet coating process to obtain an anti-fingerprint film.

[0045] In this embodiment, the water droplet angle of the high surface tension layer is 39°, and the surface energy is 65 mJ / m². 2 The number of bubble-like defects on the anti-fingerprint film is 5 per square meter. 2 The product yield rate can reach 95%.

[0046] Example 2

[0047] A PET substrate with a thickness of 125 μm is selected. An 8 nm thick layer of aluminum oxide (Al2O3) is deposited on the PET substrate using a magnetron sputtering process as a high surface tension layer. Then, a 5 μm thick AF-HC layer is coated on the high surface tension layer using a precision wet coating process to obtain an anti-fingerprint film.

[0048] In this embodiment, the water droplet angle of the high surface tension layer is 34°, and the surface energy is 85 mJ / m². 2 The number of bubble-like defects on the anti-fingerprint film is 4 per square meter. 2 The product yield rate can reach 96%.

[0049] Example 3

[0050] A PET substrate with a thickness of 50 μm is selected. A 6 nm thick titanium oxide (TiO2) layer is deposited on the PET substrate using a magnetron sputtering process as a high surface tension layer. Then, a 4 μm thick AF-HC layer is coated on the high surface tension layer using a precision wet coating process to obtain an anti-fingerprint film.

[0051] In this embodiment, the water droplet angle of the high surface tension layer is 36°, and the surface energy is 80 mJ / m². 2 The number of bubble-like defects on the anti-fingerprint film is 5 per square meter. 2 The product yield rate can reach 95%.

[0052] Example 4

[0053] A PET substrate with a thickness of 188 μm was selected. A zirconium oxide (ZrO2) layer with a thickness of 8 nm was deposited on the PET substrate using a magnetron sputtering process as a high surface tension layer. Then, an AF-HC layer with a thickness of 5 μm was coated on the high surface tension layer using a precision wet coating process to obtain an anti-fingerprint film.

[0054] In this embodiment, the water droplet angle of the high surface tension layer is 32°, and the surface energy is 90 mJ / m². 2 The number of bubble-like defects on the anti-fingerprint film is 3 per square meter. 2 The product yield rate can reach 97%.

[0055] Example 5

[0056] A PET substrate with a thickness of 188 μm is selected. A 10 nm thick layer of magnesium oxide (MgO) is deposited on the PET substrate using a magnetron sputtering process as a high surface tension layer. Then, a 5 μm thick AF-HC layer is coated on the high surface tension layer using a precision wet coating process to obtain an anti-fingerprint film.

[0057] In this embodiment, the water droplet angle of the high surface tension layer is 27°, and the surface energy is 105 mJ / m². 2 The number of bubble-like defects on the anti-fingerprint film is 2 per square meter. 2 The product yield rate can reach 98%.

[0058] Comparative Example 1

[0059] A PET substrate with a thickness of 188 μm was selected, and a 4 μm thick AF-HC layer was coated onto the PET substrate using a precision wet coating process to obtain an anti-fingerprint film. The number of bubble-like defects in the anti-fingerprint film was 30 per m. 2 The product yield rate reached 70%.

[0060] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0061] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider 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. An anti-fingerprint film, characterized in that, It includes a substrate layer, a high surface tension layer and an anti-fingerprint layer stacked in sequence, wherein the surface energy of the high surface tension layer is 40mJ / m2 to 120mJ / m2.

2. The anti-fingerprint film according to claim 1, characterized in that, The high surface tension layer material is selected from silicon oxide, aluminum oxide, titanium oxide, zirconium oxide, and magnesium oxide.

3. The anti-fingerprint film according to claim 2, characterized in that, The high surface tension layer material is limited to at least one of the following based on different surface energies: silicon oxide with a surface energy of 40 mJ / m2 to 80 mJ / m2; aluminum oxide with a surface energy of 70 mJ / m2 to 120 mJ / m2; titanium oxide with a surface energy of 50 mJ / m2 to 100 mJ / m2; zirconium oxide with a surface energy of 60 mJ / m2 to 110 mJ / m2; and magnesium oxide with a surface energy of 80 mJ / m2 to 120 mJ / m2.

4. The anti-fingerprint film according to claim 1, characterized in that, The thickness of the high surface tension layer is 5 nm to 10 nm.

5. The anti-fingerprint film according to claim 1, characterized in that, The anti-fingerprint layer is formed by a fluorine-containing coating liquid and has a thickness of 3μm to 5μm.

6. The anti-fingerprint film according to claim 1, characterized in that, The substrate layer is a PET substrate.

7. The anti-fingerprint film according to claim 1, characterized in that, The thickness of the substrate layer is 50μm to 200μm.

8. The anti-fingerprint film according to claim 1, characterized in that, The total light transmittance of the substrate layer is greater than 90%.

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