Foldable, fingerprint-resistant, low-hue, and highly abrasion-resistant AR film and its preparation method

Abstract

This invention discloses a foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film and its preparation method. The AR film, from bottom to top, comprises: a substrate layer, a high-refractive-index hardening coating, and a composite anti-fingerprint layer. The composite anti-fingerprint layer includes a high-hardness micro / nanostructure layer and a low-surface-energy oleophobic molecular layer, arranged sequentially from bottom right to top. The high-hardness micro / nanostructure layer is obtained by coating an organic-inorganic hybrid sol onto the high-refractive-index hardening coating and then curing it. The organic-inorganic hybrid sol is prepared by reacting raw materials including tetraethyl orthosilicate, methyltriethoxysilane, and aluminum isopropoxide. This invention significantly improves the durability of the anti-fingerprint effect, allowing the AR film to maintain excellent anti-fingerprint properties even after long-term use and repeated friction. The AR film of this invention significantly reduces hue issues while also ensuring mass production feasibility.

Description

Technical Field

[0001] This invention relates to the field of AR film materials, and in particular to a foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film and its preparation method. Background Technology

[0002] Anti-reflection coating (AR film) is a special optical thin film that reduces light reflection from the surface of substrates such as glass and plastic through the principle of optical interference. Its core principle is to deposit one or more layers of thin films with a specific refractive index and thickness on the substrate surface, causing reflected light to cancel out incident light due to interference, thereby significantly improving the substrate's light transmittance and reducing glare. AR films are widely used in high-end displays (such as mobile phones, tablets, and televisions), optical lenses, eyeglass lenses, automotive center console screens, museum display cases, and other fields, effectively improving visual clarity, reducing eye fatigue, and enhancing the saturation and contrast of displayed colors.

[0003] With the increasing popularity of foldable phones, users are touching the screen more and more frequently, making the screen surface extremely prone to fingerprints, oil, and sweat. These contaminants not only affect aesthetics and cleanliness but also severely damage the original anti-reflective effect of the AR film, leading to decreased screen transmittance, increased glare, and a significantly diminished user experience. Therefore, modern high-end AR films, in addition to possessing excellent optical performance, must also have outstanding anti-fingerprint (AFP) properties.

[0004] Currently, the mainstream technology in the industry for giving AR films anti-fingerprint functionality involves coating the outermost layer of the AR film with a low surface energy oleophobic coating, typically made of fluorosilane-based materials. This anti-fingerprint coating reduces surface energy, making it difficult for liquid oils and sweat to wet and spread, thus causing them to condense into easily wiped droplets. Another approach is to construct micro / nano structures on the surface, increasing the contact angle to achieve superhydrophobic / oleophobic properties (similar to the lotus leaf effect). These technologies have solved the problem to some extent, but there is still room for improvement.

[0005] The existing technology has the following main drawbacks: First, insufficient durability. Traditional single oleophobic coatings (such as AF coatings) are typically thin and flexible, with their molecular structure primarily bonded to the underlying layer through physical adsorption or weak chemical bonds. In daily use, frequent wiping, friction, and contact with clothing and pockets can quickly wear down and damage this low surface energy coating, causing its anti-fingerprint performance to deteriorate rapidly over time, resulting in a limited lifespan.

[0006] Second, the functionality is limited. Most existing solutions only focus on "anti-adhesion," that is, making it difficult for fingerprints to adhere. However, for solid fingerprints that have already adhered and dried, their "ease of cleaning" performance is poor, and users still need to rub vigorously, increasing the risk of scratching the film.

[0007] Third, the limitations of micro / nano structure solutions. Surface-built micro / nano structures themselves have low mechanical strength and are not wear-resistant. Furthermore, complex structures may affect haze, leading to decreased image clarity, and the fabrication process is complex and costly.

[0008] Fourth, the folding performance is insufficient. When inorganic materials are used as functional layers, the inorganic coating has a small shrinkage rate while the organic coating has a large shrinkage rate. When bending, the inorganic coating and the organic coating are subjected to different stresses. When the bonding force between the inorganic coating and the organic coating is insufficient, cracks are particularly prone to occur.

[0009] Fifth, the current mass-produced wet-process AR film is designed and developed by coating a PET substrate with a hardened coating (refractive index 1.48-1.55, thickness 3-5um), followed by a high-refractive index coating (refractive index 1.6-1.7, thickness 80-120nm), and then a low-refractive index coating (refractive index 1.38-1.42, thickness 80-120nm). When this product is applied to a mobile phone screen, it appears purplish or reddish, reducing the consumer's experience. Summary of the Invention

[0010] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing a foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film and its preparation method. This invention aims to: 1. Significantly improves the durability of anti-fingerprint effect, enabling the AR film to maintain excellent anti-fingerprint properties even after long-term use and repeated friction.

[0011] 2. It achieves the dual effects of "anti-adhesion" and "easy cleaning", not only preventing fresh fingerprints from adhering, but also making it easy to wipe away dried fingerprints.

[0012] 3. Achieve a perfect combination between organic coating and inorganic plating to meet foldable performance requirements.

[0013] 4. Low-hue AR films are manufactured using special substrates and unique laminated structure designs. 5. Provide a solution that is technologically feasible, cost-controllable, and has a high yield, making it easy to apply in large-scale production.

[0014] To achieve the above objectives, the technical solution adopted by the present invention is: a foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film, which comprises, from bottom to top: a substrate layer, a high-folding hardening coating, and a composite fingerprint-resistant layer, wherein the composite fingerprint-resistant layer comprises, from bottom right to top, a high-hardness micro-nano structure layer and a low surface energy oleophobic molecular layer. The high-hardness micro / nano structure layer is obtained by coating an organic-inorganic hybrid sol onto a high-refractive-index hardening coating and then curing it. The organic-inorganic hybrid sol is prepared by reacting raw materials including tetraethyl orthosilicate (TEOS), methyltriethoxysilane (MTES), and aluminum isopropoxide.

[0015] Preferably, the organic-inorganic hybrid sol is prepared by the following method: Tetraethyl orthosilicate, methyltriethoxysilane, and aluminum isopropoxide were mixed in ethanol, and hydrochloric acid was added as a catalyst. The mixture was stirred at 50-70°C for 12-48 hours to obtain the organic-inorganic hybrid sol.

[0016] Preferably, tetraethyl orthosilicate, methyltriethoxysilane, and aluminum isopropoxide are in a molar ratio of (60~80):(5~15):(15~35). The refractive index of the high-hardness micro / nano structure layer is 1.38~1.42.

[0017] Preferably, the organic-inorganic hybrid sol is prepared by the following method: Tetraethyl orthosilicate (TEOS), methyltriethoxysilane (MTES), and aluminum isopropoxide were mixed in ethanol at a molar ratio of 60:5:35. Hydrochloric acid was added as a catalyst, and the mixture was stirred at 60°C for 24 hours to obtain the organic-inorganic hybrid sol.

[0018] Preferably, the low surface energy oleophobic molecular layer is obtained by coating an AF coating liquid onto a high hardness micro / nano structure layer and then curing it.

[0019] Preferably, the AF coating liquid is UD509 from Daikin Industries, Japan.

[0020] Preferably, the high-refractive-index curing coating is obtained by applying a high-refractive-index curing liquid onto a substrate layer and then curing it. The high-refractive-index curing liquid comprises the following components by mass fraction: 10-30% polyurethane acrylic resin; 5-10% flexible resin; 10-30% high-refractive-index particles; 5-10% additives; 1-3% initiator; and the remainder is solvent.

[0021] Preferably, the high-refractive-index hardening coating has a thickness of 3-5 μm and a refractive index of 1.65-1.75; The substrate layer has a thickness of 70-120 nm and a refractive index of 1.65-1.7.

[0022] Preferably, the polyurethane acrylic resin is Sartoma resin CN9110NS, the flexible resin is Sartoma resin CN8007NS, the high-refractive-index particles are zirconium oxide with a particle size of 20-50nm, the additive is KH570, and the initiator is 184.

[0023] This invention also provides a method for preparing the foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film as described above, characterized by comprising the following steps: S1. Apply the high-refractive-index curing coating evenly to the substrate layer, bake at 70-90℃ for 2-5 minutes, and then UV cure, controlling the UV curing energy to 150-600 mJ / cm². 2 This forms a high-refractive-index hardening coating; S2. Apply the organic-inorganic hybrid sol onto the high-refractive-index hardening coating, bake at 100-140℃ for 2-10 min, and then cure at 45-65℃ for 36-144 h to form a high-hardness micro-nano structure layer. S3. Coat the AF coating liquid onto the high-hardness micro-nano structure layer, bake at 130-170℃ for 2-10 min, and then cure at 45-65℃ for 36-144 h to form a low surface energy oleophobic molecular layer, and finally obtain the foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film.

[0024] The beneficial effects of this invention are: This invention provides a foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film and its preparation method. The AR film prepared by this invention has at least the following advantages: First, it has good durability: through the micro-nano structure formulation design and the large number of cross-linking points between AF material and micro-nano structure, it maintains good hydrophobic properties even after long-term use; it also improves the wear resistance of steel wool and extends its service life.

[0025] Secondly, it exhibits excellent folding performance: As an inorganic coating, the high-hardness micro / nano structure layer reduces the stress between the inorganic and organic layers during bending. The high-hardness micro / nano structure layer itself, due to its porous structure, alleviates bending stress between atoms within the inorganic layer during bending. The KH570 in the high-bending-hardening coating contains carbon-carbon double bonds that can cross-link with those in the high-bending-hardening coating, and the siloxane in the molecular chain can tightly cross-link with the silica in the high-hardness micro / nano structure layer. This results in excellent adhesion at the interface between the high-bending-hardening coating and the high-hardness micro / nano structure layer during bending, reducing relative sliding at the interface under bending stress. The high-bending-hardening coating contains a certain proportion of flexible resin, which increases the flexibility of the hardened coating during bending. Simultaneously, the presence of the flexible resin significantly reduces the bending stress of the high-bending-hardening coating during bending. Combined with the micro / nano structure and the adhesion design of the interlayer interface, this ultimately achieves excellent bending performance.

[0026] Third, low hue: Currently, the design and development scheme of mass-produced wet-process AR films involves coating a PET substrate with a hardened coating (refractive index 1.48-1.55, thickness 3-5um), followed by a high-refractive index coating (refractive index 1.6-1.7, thickness 80-120nm), and then a low-refractive index coating (refractive index 1.38-1.42, thickness 80-120nm). When this product is applied to a mobile phone screen, it appears purplish or reddish, reducing the consumer's experience. To improve the hue problem, this invention has developed a structural scheme of PET + high-refractive index base coating + high-refractive index hardened coating + high-hardness micro-nano structure layer. This structure significantly reduces the hue problem while also ensuring mass production feasibility. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film of the present invention.

[0028] Explanation of reference numerals in the attached figures: 1—Substrate layer; 2—High-refractive-index hardening coating; 3—Composite anti-fingerprint layer; 31—High-hardness micro / nano structure layer; 32—Low surface energy oleophobic molecular layer. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to embodiments, so that those skilled in the art can implement it based on the description.

[0030] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0031] Unless otherwise specified, the experimental methods used in the following examples are conventional methods. Unless otherwise specified, the materials and reagents used in the following examples are commercially available. For examples where specific conditions are not specified, conventional conditions or conditions recommended by the manufacturer are followed. For reagents or instruments whose manufacturers are not specified, they are all commercially available products.

[0032] This invention provides a foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film, as described above. Figure 1 From bottom to top, it includes: substrate layer 1, high-refractive-hardening coating 2, and composite anti-fingerprint layer 3. The composite anti-fingerprint layer 3 includes a high-hardness micro-nano structure layer 31 and a low surface energy oleophobic molecular layer 32 arranged sequentially from bottom right to top. The high-hardness micro-nano structure layer 31 is obtained by coating an organic-inorganic hybrid sol onto a high-refractive-index hardening coating layer 2 and then curing it. The organic-inorganic hybrid sol is prepared by reacting raw materials including tetraethyl orthosilicate (TEOS), methyltriethoxysilane (MTES) and aluminum isopropoxide.

[0033] In a preferred embodiment, the organic-inorganic hybrid sol is prepared by the following method: Tetraethyl orthosilicate, methyltriethoxysilane, and aluminum isopropoxide were mixed in ethanol, and hydrochloric acid was added as a catalyst. The mixture was stirred at 50-70°C for 12-48 hours to obtain an organic-inorganic hybrid sol.

[0034] In a preferred embodiment, tetraethyl orthosilicate, methyltriethoxysilane, and aluminum isopropoxide are in a molar ratio of (60~80):(5~15):(15~35). The refractive index of the high-hardness micro / nano structure layer is 1.38~1.42.

[0035] In a preferred embodiment, the organic-inorganic hybrid sol is prepared by the following method: Tetraethyl orthosilicate (TEOS), methyltriethoxysilane (MTES), and aluminum isopropoxide were mixed in ethanol at a molar ratio of 60:5:35. Hydrochloric acid was added as a catalyst, and the mixture was stirred at 60°C for 24 hours to obtain an organic-inorganic hybrid sol.

[0036] The low surface energy oleophobic molecular layer is chemically bonded to the surface and pores of the micro / nano structure substrate via wet coating. The material is a long-chain perfluoroalkyl silane or its derivative. In a preferred embodiment, the low surface energy oleophobic molecular layer is obtained by coating a high-hardness micro / nano structure layer with an AF coating solution followed by curing.

[0037] In a preferred embodiment, the AF coating liquid is UD509 from Daikin Industries, Japan.

[0038] In a preferred embodiment, the high-refractive-index curing coating is obtained by applying a high-refractive-index curing liquid onto a substrate layer and then curing it. The high-refractive-index curing liquid comprises the following components by mass fraction: 10-30% polyurethane acrylic resin; 5-10% flexible resin; 10-30% high-refractive-index particles; 5-10% additives; 1-3% initiator; and the remainder is solvent.

[0039] In a preferred embodiment, the high-refractive-index hardening coating has a thickness of 3-5 μm and a refractive index of 1.65-1.75; In a preferred embodiment, the substrate layer has a thickness of 70-120 nm and a refractive index of 1.65-1.7. More preferably, the substrate layer is PET.

[0040] In a preferred embodiment, the polyurethane acrylic resin is Sartoma resin CN9110NS, the flexible resin is Sartoma resin CN8007NS, the high-refractive-index particles are zirconium oxide with a particle size of 20-50nm, the additive is KH570, and the initiator is 184.

[0041] The present invention also provides a method for preparing the above-mentioned foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film, characterized by comprising the following steps: S1. Apply the high-refractive-index curing coating evenly to the substrate layer, bake at 70-90℃ for 2-5 minutes, and then UV cure, controlling the UV curing energy to 150-600 mJ / cm². 2 This forms a high-refractive-index hardening coating; S2. Apply the organic-inorganic hybrid sol onto the high-refractive-index hardening coating, bake at 100-140℃ for 2-10 min, and then cure at 45-65℃ for 36-144 h to form a high-hardness micro-nano structure layer. S3. Coat the AF coating liquid onto the high-hardness micro-nano structure layer, bake at 130-170℃ for 2-10 minutes, and then cure at 45-65℃ for 36-144 hours to form a low surface energy oleophobic molecular layer, and finally obtain a foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film.

[0042] This invention constructs a multi-layered, multi-mechanism synergistic composite anti-fingerprint layer structure and achieves its integrated design and high-performance integration, specifically through the following improvements: First, through the micro-nano structure formulation design and the numerous cross-linking points between the AF material and the micro-nano structure, excellent hydrophobic properties are maintained even after long-term use. This improves the abrasion resistance of the steel wool and extends its service life.

[0043] Secondly, the inorganic coating employs a micro / nano structure, reducing stress between the inorganic and organic layers during bending. The micro / nano structure itself, due to its inherent porous structure, alleviates bending stress between atoms within the inorganic layer during bending. The KH570 in the high-bend-hardening coating contains carbon-carbon double bonds that can cross-link with those in the high-bend-hardening coating, and the siloxane in the molecular chain can tightly cross-link with the silica in the micro / nano structure. This results in excellent adhesion at the interface between the high-bend-hardening coating and the micro / nano structure during bending, reducing relative sliding at the interface under bending stress. The high-bend-hardening coating contains a certain proportion of flexible resin, increasing its flexibility during bending. Simultaneously, the presence of the flexible resin significantly reduces bending stress during bending. Combined with the micro / nano structure and the adhesion design of the interlayer interface, excellent bending performance is ultimately achieved.

[0044] Third, a product structure was designed and developed: PET + high-fold bottom coating + high-fold hardening coating + micro-nano structure. This structure significantly reduces the hue problem while also ensuring mass production feasibility.

[0045] The above is the general concept of the present invention. Based on this, detailed embodiments and comparative examples are provided below to further illustrate the present invention.

[0046] Example 1 A foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film comprises, from bottom to top: a substrate layer, a high-folding hardening coating, and a composite anti-fingerprint layer. The composite anti-fingerprint layer comprises, from bottom right to top, a high-hardness micro-nano structure layer and a low-surface-energy oleophobic molecular layer. The preparation method of this AR film includes the following steps: S1. Apply the high-refractive-index curing coating evenly to the substrate layer (50μm thick UH4V substrate from Toray Industries, Japan), bake at 80℃ for 3 minutes, and then UV cure, controlling the UV curing energy to 300mJ / cm². 2 A high-refractive-index hardened coating with a thickness of 3 μm and a refractive index of 1.65 is formed. The high-refractive-index curing coating comprises the following components by mass fraction: Polyurethane acrylic resin content 30%, Sartoma resin CN9110NS; The flexible resin content is 10%, and the resin content is Sartoma resin CN8007NS; The high-refractive-index particle content is 10%, and the high-refractive-index particles are zirconium oxide (particle size of 20-50nm). The additive content is 10%, and the additive is KH570; The initiator content is 3%, and the initiator is 184. The remainder is solvent, specifically MIBK.

[0047] S2. Fabrication of high-hardness micro / nano structure layers: S2-1, Preparation of organic-inorganic hybrid sol: Preparation of sol-gel solution: Tetraethyl orthosilicate (TEOS), methyltriethoxysilane (MTES) and aluminum isopropoxide are mixed in a molar ratio of 60:5:35, ethanol is added as solvent, and a small amount of 5% hydrochloric acid is added as catalyst. The mixture is stirred at 60°C for 24 hours to hydrolyze and condense, forming an organic-inorganic hybrid sol.

[0048] The amount of ethanol added is 10 times the volume of tetraethyl orthosilicate, and the mass of the catalyst added is 1% of the mass of tetraethyl orthosilicate. The organic groups in MTES are used to improve the flexibility and adhesion of the coating, while the introduction of aluminum isopropoxide is used to enhance hardness and wear resistance.

[0049] S2-2. Using a slit coating method, the above-mentioned organic-inorganic hybrid sol is uniformly coated on the surface of the high-refractive-index hardening coating. It is pre-cured at 120°C for 5 minutes, and then cured at 55°C for 72 hours to form a hard and transparent layer with high cross-linking degree and nano-roughness on the surface, namely a high-hardness micro-nano structure layer with a thickness of 100nm and a refractive index of 1.42.

[0050] S3. Preparation of a low surface energy oleophobic molecular layer: The AF coating solution was applied to the surface of the high-hardness micro-nano structure layer prepared above using an FKG coating device. The baking temperature was 150℃, the baking time was 5 minutes, and the coating speed was 10m / min. The finished sample was placed in a curing chamber for 72 hours at a curing temperature of 55℃ to form a low surface energy oleophobic molecular layer, ultimately obtaining a foldable, fingerprint-resistant, low-color, and highly wear-resistant AR film.

[0051] The AF coating liquid is UD509 from Daikin Industries, Japan.

[0052] The AF coating liquid molecules penetrate into the pores of the micro-nano structure substrate. Its ethoxy group (-OC2H5) undergoes a hydrolysis and condensation reaction with the silanol group (-Si-OH) on the substrate surface to form a strong Si-O-Si covalent bond, thereby firmly grafting the long-chain perfluorinated groups onto the entire surface of the high-hardness micro-nano structure layer in the form of a monolayer.

[0053] Example 2 The only difference between this example and Example 1 is: The mass fraction of high-refractive-index particles in the high-refractive-index hardening coating solution was adjusted to 30%, the solvent ratio was changed accordingly, and the proportions of the remaining components remained unchanged; the refractive index of the prepared high-refractive-index hardening coating was 1.75.

[0054] Example 3 The only difference between this example and Example 1 is: The mass fraction of additives in the high-refractive-index hardening coating is adjusted to 5%, the solvent ratio is changed accordingly, and the proportions of the remaining components remain unchanged.

[0055] Example 4 The only difference between this example and Example 1 is: The thickness of the high-refractive-index hardening coating is 5 μm.

[0056] Example 5: The only difference between this example and Example 1 is: The mass fraction of flexible resin in the high-refractive-index curing coating is adjusted to 5%, the solvent ratio is changed accordingly, and the proportions of the remaining components remain unchanged.

[0057] Example 6: The only difference between this example and Example 1 is: In the preparation of organic-inorganic hybrid sol, tetraethyl orthosilicate (TEOS), methyltriethoxysilane (MTES) and aluminum isopropoxide are mixed in a molar ratio of 80:5:15, and the refractive index of the high-hardness micro-nano structure layer prepared is 1.38.

[0058] Comparative Example 1 The only difference between this example and Example 1 is: The composite anti-fingerprint layer is a low-reflection coating made by wet coating, and then a layer of wet AF is coated on the low-reflection coating; the AF material and coating process are consistent with those in Example 1.

[0059] The low-reflection curing coating comprises the following components by mass fraction (the following are mass contents): Polyurethane acrylic resin content 30%, Sartoma resin CN9110NS; The low-refractive particle content is 30%, and the low-refractive particles are silicon dioxide (particle size 20-50nm). The manufacturer is Ningbo Teli Technology Co., Ltd., and the model is HKT-MM20-40. The initiator content is 3%, and the initiator is 184. The remainder is solvent, specifically MIBK.

[0060] Comparative Example 2 An AR film, comprising, from bottom to top: a substrate layer, a hardening coating, and a high-refractive-index hardening coating, is prepared by: S1. Apply the hardening coating adhesive evenly to the substrate layer (50μm thick U483 substrate from Toray Industries, Japan), bake at 80℃ for 3 minutes, and then UV cure, controlling the UV curing energy to 300mJ / cm². 2 A hardened coating with a thickness of 3 μm is formed; the refractive index of the hardened coating is 1.5. The formulation of the hardened coating adhesive is as follows (the following are mass contents): Polyurethane acrylic resin content 30%, Sartoma resin CN9110NS; The flexible resin content is 10%, and the resin content is Sartoma resin CN8007NS; The initiator content is 3%, and the initiator is 184. The remainder is solvent, specifically MIBK.

[0061] S2. Apply the high-refractive-index hardening agent evenly to the hardening coating, bake at 80℃ for 3 minutes, and then UV cure, controlling the UV curing energy to 300mJ / cm². 2 A high-refractive-index hardening coating with a thickness of 0.1 μm and a refractive index of 1.65 is formed. The formulation of the high-refractive-index hardening coating solution is the same as that in Example 1.

[0062] Comparative Example 3 The only difference between this example and Example 1 is: In the preparation of the organic-inorganic hybrid sol, tetraethyl orthosilicate (TEOS), methyltriethoxysilane (MTES) and aluminum isopropoxide are mixed in a molar ratio of 50:10:40, and the refractive index of the high-hardness micro-nano structure layer prepared is 1.43.

[0063] Comparative Example 4 The only difference between this example and Example 1 is: No flexible resin is added to the high-refractive-index curing coating, the solvent ratio changes accordingly, and the proportions of the other components remain unchanged.

[0064] Comparative Example 5 The only difference between this example and Example 1 is: The high-hardness micro / nano structure layer was replaced with a silicon dioxide layer made by PVD evaporation, which has a thickness of 100 nm and a refractive index of 1.45.

[0065] The AR films prepared in the examples and comparative examples were made into samples and subjected to the following performance tests: 1. Steel wool abrasion resistance test: 1kg load, bonstar#0000 steel wool, contact area 2cm*2cm, back and forth movement speed 40 times / minute.

[0066] 2. Reflectance test: Spectrophotometer test, with black coating applied to the back of the sample.

[0067] 3. a-value and b-value test: Spectrophotometer test, with black coating applied to the back of the sample.

[0068] 4. Room temperature bending test: bending radius is 1.8mm, temperature is 25 degrees.

[0069] 5. Low temperature bending test: bending radius is 1.8mm, temperature is -20 degrees Celsius.

[0070] 6. Anti-fingerprint effect evaluation: Visually observe the degree of fingerprint residue left on the film surface. The more asterisks there are, the better the anti-fingerprint effect. Test metrics Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Steel wool wear-resistant 1500 1500 1500 1500 1500 800 800 1000 1700 1500 1500 Reflectivity (550nm) 0.8 0.5 0.8 0.8 0.8 0.4 0.8 0.8 1.3 0.8 1.5 teardrop corner 116 116 116 116 116 116 111 116 116 116 114 value of a 2.5 2.7 2.5 2.5 2.5 2.5 2.5 10.2 2.2 2.5 2.7 b value -3.5 -3.8 -3.5 -3.5 -3.5 -3.5 -3.5 -18.3 -3.1 -3.5 -3.2 Elongation at break 4.5% 4.5% 4.5% 3.1% 3.0% 4.5% 4.9% 5.2% 4.5% 1.7% 3.0% room temperature bending 200,000 200,000 180,000 190,000 160,000 200,000 200,000 200,000 200,000 50,000 70,000 Low temperature bending 100,000 100,000 50,000 70,000 50,000 100,000 100,000 100,000 100,000 0.5 million 10,000 Anti-fingerprint effect ***** ***** ***** ***** ***** ***** * * ***** ***** **

[0071] The test results above demonstrate that: By designing a micro-nano structure formulation and having numerous cross-linking points between the AF material and the micro-nano structure, the wear resistance of steel wool is improved, while the anti-fingerprint effect is also enhanced. The inorganic coating employs a micro / nano structure. Due to its inherent porous structure, it reduces stress between the inorganic and organic layers during bending, alleviating bending stress between atoms within the inorganic layer and thus increasing the number of bends. The KH570 in the high-bend-hardening coating contains carbon-carbon double bonds that can cross-link with those in the high-bend-hardening coating itself. The siloxane in the molecular chain can also tightly cross-link with the silica in the micro / nano structure. This results in excellent adhesion at the interface between the high-bend-hardening coating and the micro / nano structure during bending, reducing relative sliding at the interface under bending stress and further increasing the number of bends. The high-bend-hardening coating contains a certain proportion of flexible resin, increasing its flexibility during bending. Simultaneously, the presence of the flexible resin significantly reduces bending stress during bending. Combined with the micro / nano structure and the adhesion design at the interlayer interface, a very high number of bends is ultimately achieved. The product structure was designed and developed: PET + high-fold bottom coating + high-fold hardening coating + micro-nano structure. This structure significantly reduces the hue problem, achieving an a value between 0 and 5, while simultaneously achieving a b value between -5 and 0.

[0072] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details.

Claims

1. A foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film, characterized in that, From bottom to top, it includes: a substrate layer, a high-refractive-index hardening coating, and a composite anti-fingerprint layer. The composite anti-fingerprint layer includes a high-hardness micro-nano structure layer and a low surface energy oleophobic molecular layer arranged sequentially from bottom right to top. The high-hardness micro / nano structure layer is obtained by coating an organic-inorganic hybrid sol onto a high-refractive-index hardening coating and then curing it. The organic-inorganic hybrid sol is prepared by reacting raw materials including tetraethyl orthosilicate, methyltriethoxysilane and aluminum isopropoxide.

2. The foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film according to claim 1, characterized in that, The organic-inorganic hybrid sol was prepared by the following method: Tetraethyl orthosilicate, methyltriethoxysilane, and aluminum isopropoxide were mixed in ethanol, and hydrochloric acid was added as a catalyst. The mixture was stirred at 50-70°C for 12-48 hours to obtain the organic-inorganic hybrid sol.

3. The foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film according to claim 2, characterized in that, Tetraethyl orthosilicate, methyltriethoxysilane and aluminum isopropoxide in a molar ratio of (60~80):(5~15):(15~35); The refractive index of the high-hardness micro / nano structure layer is 1.38~1.

42.

4. The foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film according to claim 3, characterized in that, The organic-inorganic hybrid sol was prepared by the following method: Tetraethyl orthosilicate, methyltriethoxysilane, and aluminum isopropoxide were mixed in ethanol at a molar ratio of 60:5:

35. Hydrochloric acid was added as a catalyst, and the mixture was stirred at 60°C for 24 hours to obtain the organic-inorganic hybrid sol.

5. The foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film according to claim 1, characterized in that, The low surface energy oleophobic molecular layer is obtained by coating an AF coating liquid onto a high hardness micro-nano structure layer and then curing it.

6. The foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film according to claim 5, characterized in that, The AF coating liquid is UD509 from Daikin Industries, Japan.

7. The foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film according to claim 1, characterized in that, The high-refractive-index curing coating is obtained by applying a high-refractive-index curing liquid onto a substrate layer and then curing it. The high-refractive-index curing liquid comprises the following components by mass fraction: 10-30% polyurethane acrylic resin; 5-10% flexible resin; 10-30% high-refractive-index particles; 5-10% additives; 1-3% initiator; and the remainder is solvent.

8. The foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film according to claim 7, characterized in that, The high-refractive-index hardening coating has a thickness of 3-5 μm and a refractive index of 1.65-1.

75. The substrate layer has a thickness of 70-120 nm and a refractive index of 1.65-1.

7.

9. The foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film according to claim 8, characterized in that, The polyurethane acrylic resin is Sartoma resin CN9110NS, the flexible resin is Sartoma resin CN8007NS, the high-refractive-index particles are zirconium oxide with a particle size of 20-50nm, the additive is KH570, and the initiator is 184.

10. A method for preparing a foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film as described in any one of claims 1-9, characterized in that, Includes the following steps: S1, uniformly coat the high-refractive hard coating liquid on the substrate layer, bake at 70-90°C for 2-5 min, then UV cure, control the UV curing energy to be 150-600 mJ / cm 2 , to form a high-refractive hard coating layer; S2. Apply the organic-inorganic hybrid sol onto the high-refractive-index hardening coating, bake at 100-140℃ for 2-10 min, and then cure at 45-65℃ for 36-144 h to form a high-hardness micro-nano structure layer. S3. Coat the AF coating liquid onto the high-hardness micro-nano structure layer, bake at 130-170℃ for 2-10 min, and then cure at 45-65℃ for 36-144 h to form a low surface energy oleophobic molecular layer, and finally obtain the foldable, fingerprint-resistant, low-hue, and highly wear-resistant AR film.

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