An anti-fingerprint and nail-print resistant protective film and a method of manufacturing the same

Abstract

This application relates to the field of protective films, disclosing a fingerprint-resistant and nail-print-resistant protective film and its preparation method. The fingerprint-resistant and nail-print-resistant protective film comprises, from top to bottom, a nano-anti-fingerprint coating, a self-healing coating, an elastic polyurethane film layer, and an adhesive layer, sequentially bonded together. The nano-anti-fingerprint coating is a nano-fluorine-containing coating, the self-healing coating is a self-healing polyurethane coating, and the adhesive layer is obtained by curing an adhesive. The adhesive is made from the following raw materials in parts by weight: 60-80 parts acrylic resin, 10-20 parts hydroxyacrylate monomer, 5-8 parts dipentaerythritol hexaacrylate, 3-5 parts cyclohexanediol-1,4-diacrylate, 2-6 parts methyl methacrylate, 1-5 parts isobornyl acrylate, 3-6 parts photoinitiator, and 1-3 parts antioxidant. The resulting protective film exhibits good fingerprint and nail-print resistance while also possessing high clarity and adhesion stability, and is not prone to edge lifting.

Description

Technical Field

[0001] This application relates to the field of protective films, and more specifically, to a fingerprint-resistant and nail-print-resistant protective film and a method for preparing the same. Background Technology

[0002] Screen protectors for electronic products can protect the display screen of electronic products while maintaining the high definition of the screen. They are scratch-resistant, fingerprint-resistant, and nail-print resistant, and can meet the user's needs in various environments.

[0003] To improve the fingerprint and nail polish resistance of screen protectors, some existing technologies address this issue by coating a self-healing layer on the surface of the protector and altering its thickness or hardness. However, this method can easily cause the protector to peel up at the edges, affecting the adhesion stability between the protector and the display screen. Other existing technologies involve frosting the surface of the protector or applying a frosted coating. While this can solve the fingerprint and nail polish resistance problems, it significantly reduces the clarity of the display screen and affects the user experience. Summary of the Invention

[0004] To address the issue that existing electronic product display screen protectors cannot simultaneously provide good fingerprint and nail mark resistance while also offering high definition and stable adhesion, this application provides a fingerprint-resistant and nail mark-resistant protective film and its preparation method.

[0005] In a first aspect, this application provides a protective film that is resistant to fingerprints and nail polish, employing the following technical solution:

[0006] A fingerprint-resistant and nail-print-resistant protective film includes, from top to bottom, a nano-anti-fingerprint coating, a self-healing coating, an elastic polyurethane film layer, and an adhesive layer, which are sequentially bonded together. The nano-anti-fingerprint coating is a nano-fluorine-containing coating, the self-healing coating is a self-healing polyurethane coating, and the adhesive layer is obtained by curing an adhesive. The adhesive is made from the following raw materials in parts by weight:

[0007] 60-80 parts of acrylic resin

[0008] 10-20 parts of hydroxyacrylate monomer

[0009] 5-8 parts of dipentaerythritol hexaacrylate

[0010] 3-5 parts of cyclohexanediethanol-1,4-diacrylate

[0011] 2-6 parts of methyl methacrylate

[0012] 1-5 parts of isoborneol acrylate

[0013] 3-6 parts of photoinitiator

[0014] Antioxidant 1-3 parts.

[0015] By adopting the above technical solution, the protective film of this application is composed of a nano-anti-fingerprint coating, a self-healing coating, an elastic polyurethane film layer, and an adhesive layer. The nano-anti-fingerprint layer has good hydrophobicity and anti-fingerprint properties, while not affecting the clarity of the protective film. The self-healing layer, the elastic polyurethane film layer, and the adhesive layer form a repair structure layer with good buffering and rebound performance, enabling the protective film to quickly rebound from the fingernail marks when scratched by a fingernail. The adhesive layer is made of acrylic resin, hydroxyacrylate monomer, dipentaerythritol hexaacrylate, cyclohexanediol-1,4-diacrylate, methyl methacrylate, isobornyl acrylate, photoinitiator, and antioxidant. The adhesive layer prepared in this way has good adhesion stability and resilience, allowing the protective film to work with the elastic polyurethane film layer and the self-healing coating to quickly rebound from the fingernail marks when scratched by a fingernail, while also adhering stably to the display screen surface, maintaining good clarity without peeling.

[0016] Preferably, the hydroxyacrylate monomer is composed of tri(2-hydroxyethyl) isocyanurate triacrylate and hydroxyethyl methacrylate in a weight ratio of (1-3):1.

[0017] By adopting the above technical solution, the hydroxy acrylate monomer composed of tri(2-hydroxyethyl)isocyanurate triacrylate and hydroxyethyl methacrylate can improve the flexibility, adhesion and resilience of the adhesive layer, thereby enhancing the nail mark resistance of the protective film.

[0018] Preferably, the photoinitiator is a combination of at least two of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxycyclohexylphenyl ketone, and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide.

[0019] By adopting the above technical solution, the photoinitiator can improve the crosslinking and curing efficiency of each component in the adhesive, thereby improving the bonding stability of the prepared adhesive layer and reducing the problem of edge lifting of the protective film.

[0020] Preferably, the thickness of the adhesive layer is 30-40 μm.

[0021] By adopting the above technical solution, the adhesive layer with a better thickness not only has better resilience, but also better bonding stability and clarity, reducing the problem of edge lifting.

[0022] Preferably, the nano-fluorine-containing coating is obtained by curing a nano-fluorine-containing coating agent, which is prepared from the following raw materials in parts by weight:

[0023] 40-60 parts of perfluorooctylpropyl acrylate

[0024] 8-12 parts of methyl methacrylate

[0025] 5-10 parts of nano-silica

[0026] 1-3 parts of heptadecyltriethoxysilane

[0027] 0.05-0.15 parts of benzoyl peroxide.

[0028] By adopting the above technical solution, perfluorooctylpropyl acrylate and methyl methacrylate are cross-linked and cured under the catalysis of benzoyl peroxide to obtain a nano-anti-fingerprint coating, which endows the protective film with excellent hardness, hydrophobicity and anti-fingerprint properties, effectively preventing fingerprint residue. Nano-silica can be interwoven and dispersed into the cross-linking system of perfluorooctylpropyl acrylate and methyl methacrylate under the dispersion action of heptadecafluorodecyltriethoxysilane. The nano-anti-fingerprint coating obtained in this way has a dense and stable structure, which can further improve the hydrophobicity and anti-fingerprint properties of the obtained protective film, without affecting the clarity of the protective film.

[0029] Preferably, the thickness of the nano-fluorine-containing coating is 1-5 μm.

[0030] By adopting the above technical solution, the nano-fluorine-containing coating with a relatively optimal thickness has good adhesion stability, hydrophobicity and fingerprint resistance, while avoiding the problem of excessive coating thickness affecting the clarity of the protective film.

[0031] Preferably, the self-healing polyurethane coating is obtained by curing a self-healing polyurethane agent, which is made from the following raw materials in parts by weight:

[0032] 40-60 parts of polyurethane acrylate

[0033] 10-20 parts of diphenylmethane diisocyanate

[0034] 5-10 parts of hydroxyethyl acrylate

[0035] 2-4 parts of photoinitiator

[0036] Antioxidant 1-2 parts.

[0037] By adopting the above technical solution, polyurethane acrylate, diphenylmethane diisocyanate and hydroxyethyl acrylate produce a good synergistic effect. Under the action of photoinitiator, they crosslink and cure to form a self-healing polyurethane coating with a crosslinked structure. It has moderate hardness and excellent self-healing ability, as well as high transparency and mechanical strength. When the protective film is scratched by a fingernail, it can quickly restore its original shape, reduce the residue of fingernail marks, and at the same time improve the adhesion stability of the nano-fluorine-containing coating on the surface of the elastic polyurethane film.

[0038] Preferably, the thickness of the self-healing polyurethane coating is 30-40 μm.

[0039] By adopting the above technical solution, the self-healing polyurethane coating with a better thickness enables the protective film to quickly recover its original shape when scratched by a nail, effectively reducing the generation of nail marks while improving the interlayer bonding stability of the protective film.

[0040] The elastic polyurethane film layer is obtained by curing an elastic polyurethane agent, which is made from the following raw materials in parts by weight:

[0041] 40-60 parts of polyurethane acrylate

[0042] 5-10 parts of hydroxyethyl acrylate

[0043] 1-3 parts of photoinitiator

[0044] Antioxidant 1-2 parts.

[0045] By adopting the above technical solution, the elastic polyurethane film layer has better softness, cushioning, and resilience compared to the self-healing polyurethane coating. It can effectively absorb energy when the protective film is subjected to external impact, preventing damage caused by fingernail scratches. At the same time, it also has good flexibility and adhesion, ensuring that the protective film will not peel off during long-term use, allowing the protective film to adhere tightly to the display screen.

[0046] Preferably, the thickness of the elastic polyurethane film layer is 100-115 μm.

[0047] By adopting the above technical solution, the elastic polyurethane film layer with a better thickness can ensure that the protective film has good buffering and resilience performance, effectively reduce the marks caused by fingernail scratches, and at the same time ensure the stable adhesion between the protective film and the display screen, avoiding the problem of edge lifting.

[0048] Secondly, this application provides a method for preparing a fingerprint-resistant and nail-print-resistant protective film, which adopts the following technical solution:

[0049] A method for preparing a fingerprint-resistant and nail-print-resistant protective film includes the following steps:

[0050] S1. Prepare an elastic polyurethane film layer;

[0051] S2. Apply adhesive to one side of the elastic polyurethane film and cure it to form an adhesive layer on the surface of the elastic polyurethane film.

[0052] S3. A self-healing coating and a nano anti-fingerprint coating are sequentially bonded to the side of the elastic polyurethane film away from the adhesive layer to obtain a protective film that is resistant to fingerprints and nail marks.

[0053] By adopting the above technical solution, an elastic polyurethane film layer is first prepared, and then an adhesive is uniformly coated on one side of the elastic polyurethane film layer and cured to form a strong adhesive layer. Then, a self-healing coating and a nano anti-fingerprint coating are bonded to the side of the elastic polyurethane film layer away from the adhesive layer in sequence, thereby improving the interlayer bonding strength of the self-healing coating and the nano anti-fingerprint coating, making them less likely to separate and fall off.

[0054] In summary, this application has the following beneficial effects:

[0055] 1. The anti-fingerprint and nail-print resistant protective film of this application is composed of a nano anti-fingerprint coating, a self-healing coating, an elastic polyurethane film layer, and an adhesive layer. The nano anti-fingerprint layer has good hydrophobicity and anti-fingerprint properties, while not affecting the clarity of the protective film. The self-healing layer, the elastic polyurethane film layer, and the adhesive layer form a repair structure layer with good buffering and rebound performance, which allows the protective film to quickly rebound from the nail marks when scratched by a nail. The protective film made in this way has excellent anti-fingerprint and nail-print resistance, while also having good clarity and adhesion stability, and is not easy to peel off at the edges.

[0056] 2. An adhesive layer is prepared using acrylic resin, hydroxyacrylate monomer, dipentaerythritol hexaacrylate, cyclohexanediol-1,4-diacrylate, methyl methacrylate, isobornyl acrylate, photoinitiator, and antioxidant. The adhesive layer prepared in this way has good adhesion stability and resilience, which allows the protective film to quickly rebound from the nail mark in conjunction with the elastic polyurethane film layer and the self-healing coating when scratched by a fingernail. At the same time, it can stably adhere to the surface of the display screen, maintaining good clarity without the problem of edge lifting.

[0057] 3. Hydroxyacrylate monomers composed of tri(2-hydroxyethyl)isocyanurate triacrylate and hydroxyethyl methacrylate in a better weight ratio can improve the flexibility, adhesion and resilience of the adhesive layer, thereby improving the nail mark resistance of the protective film.

[0058] 4. A self-healing polyurethane coating with a cross-linked structure is formed by the synergistic effect of polyurethane acrylate, diphenylmethane diisocyanate, and hydroxyethyl acrylate under the action of a photoinitiator. Furthermore, an elastic polyurethane film with a cross-linked structure is formed by the synergistic effect of polyurethane acrylate and hydroxyethyl acrylate under the action of a photoinitiator. This is further enhanced by the use of perfluorooctylpropyl acrylate, methyl methacrylate, nano-silica, and heptadecanyltriethoxysilane, cured under the catalysis of benzoyl peroxide to create a nano-anti-fingerprint coating. This coating works synergistically with the adhesive layer of this application, resulting in a protective film with excellent anti-fingerprint and nail-print resistance, good clarity and adhesion stability, and minimal edge lifting. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of the layer structure of the fingerprint-resistant and nail-print-resistant protective film of this application.

[0060] Explanation of reference numerals in the attached diagram: 1. Nano anti-fingerprint coating; 2. Self-healing coating; 3. Elastic polyurethane film layer; 4. Adhesive layer. Detailed Implementation

[0061] The following is in conjunction with the appendix Figure 1 The present application will be further described in detail with reference to the embodiments.

[0062] The following are some of the sources and specifications of the raw materials used in this application. The raw materials used in the preparation examples and embodiments of this application can all be obtained commercially, including but not limited to the following models and manufacturers of raw materials. Raw materials with equivalent performance can also be used:

[0063] 1. Acrylic resin: LENCOLO, L-6020;

[0064] 2. Nano silica: Vapor-phase nano silica, particle size 10-50nm;

[0065] 3. Heptadecyltriethoxysilane: KH-1732;

[0066] 4. Polyurethane acrylate: LENCOLO, L-8323.

[0067] Preparation examples of adhesives

[0068] Preparation Example 1

[0069] Preparation Example 1 discloses an adhesive prepared by the following steps:

[0070] 6 kg of acrylic resin, 1 kg of hydroxyacrylate monomer (composed of hydroxyethyl methacrylate and β-hydroxypropyl acrylate in a weight ratio of 1:1), 0.8 kg of dipentaerythritol hexaacrylate, 0.3 kg of cyclohexanediol-1,4-diacrylate, 0.2 kg of methyl methacrylate, and 0.5 kg of isobornyl acrylate were mixed for 20 min. After mixing evenly, 0.3 kg of photoinitiator (composed of 2-hydroxy-2-methyl-1-phenyl-1-propanone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a weight ratio of 1:1) and 0.1 kg of antioxidant (composed of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1) were added and mixed for 10 min to obtain the adhesive.

[0071] Preparation Examples 2-3

[0072] The difference between Preparation Example 2-3 and Preparation Example 1 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 1 below.

[0073] Table 1. Parameters for Preparation Examples 1-3

[0074]

[0075]

[0076] Preparation Example 4

[0077] The difference between Preparation Example 4 and Preparation Example 1 is that the hydroxy acrylate monomer in Preparation Example 4 is composed of tri(2-hydroxyethyl) isocyanurate triacrylate and hydroxyethyl methacrylate in a weight ratio of 1:1, while the rest is the same as Preparation Example 1.

[0078] Preparation Example 5

[0079] The difference between Preparation Example 5 and Preparation Example 1 is that the hydroxy acrylate monomer in Preparation Example 5 is composed of tris(2-hydroxyethyl)isocyanurate triacrylate and hydroxyethyl methacrylate in a weight ratio of 3:1, while the rest is the same as Preparation Example 1.

[0080] Preparation of Comparative Example 1

[0081] The difference between Comparative Example 1 and Preparation Example 1 is that cyclohexanediol-1,4-diacrylate is replaced with an equal amount of dipentaerythritol hexaacrylate, otherwise it is the same as Preparation Example 1.

[0082] Preparation of Comparative Example 2

[0083] The difference between Comparative Example 2 and Preparation Example 1 is that bispentaerythritol hexaacrylate was replaced with an equal amount of hydroxyacrylate monomer, while the rest was the same as Preparation Example 1.

[0084] Preparation example of elastic polyurethane agent

[0085] Preparation Example 6

[0086] Preparation Example 6 discloses an elastic polyurethane agent, which is prepared by the following steps: 4 kg of polyurethane acrylate, 1 kg of hydroxyethyl acrylate, 0.1 kg of photoinitiator (composed of 1-hydroxycyclohexylphenyl ketone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a weight ratio of 1:1) and 0.1 kg of antioxidant (composed of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1) are mixed for 20 min and mixed evenly to obtain the elastic polyurethane agent.

[0087] Preparation Examples 7-8

[0088] The difference between Preparation Examples 7-8 and Preparation Example 6 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 2 below.

[0089] Table 2 Parameter table for preparation examples 6-8

[0090]

[0091]

[0092] Example of preparation of self-healing polyurethane agent

[0093] Preparation Example 9

[0094] Preparation Example 9 discloses a self-healing polyurethane agent, which is prepared by the following steps: 4 kg of polyurethane acrylate, 1 kg of diphenylmethane diisocyanate, 1 kg of hydroxyethyl acrylate, 0.1 kg of photoinitiator (composed of 1-hydroxycyclohexylphenyl ketone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a weight ratio of 1:1) and 0.1 kg of antioxidant (composed of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1) are mixed for 20 min until homogeneous, thus obtaining the elastic polyurethane agent.

[0095] Preparation Examples 10-11

[0096] The difference between Preparation Examples 10-11 and Preparation Example 9 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 3 below.

[0097] Table 3 Parameter table for preparation examples 9-11

[0098]

[0099]

[0100] Preparation Example 12

[0101] The difference between Preparation Example 12 and Preparation Example 9 is that diphenylmethane diisocyanate is replaced with polyurethane acrylate in equal amounts, while the rest is the same as Preparation Example 9.

[0102] Preparation example of nano-fluorine-containing coating agent

[0103] Preparation Example 13

[0104] Preparation Example 13 discloses a nano-fluorinated coating agent, which is prepared by the following steps: 4 kg of perfluorooctylpropyl acrylate, 0.8 kg of methyl methacrylate, 0.1 kg of heptadecanyltriethoxysilane, 0.5 kg of nano-silica and 0.005 kg of benzoyl peroxide are mixed evenly to obtain the nano-fluorinated coating agent.

[0105] Preparation Examples 14-15

[0106] The difference between Preparation Examples 14-15 and Preparation Example 13 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 4 below.

[0107] Table 4 Parameter table for preparation examples 13-15

[0108]

[0109]

[0110] Preparation Example 16

[0111] The difference between Preparation Example 16 and Preparation Example 13 is that heptadecanodecyltriethoxysilane is replaced with vinyltrimethoxysilane in equal amounts, while the rest is the same as Preparation Example 13.

[0112] Example

[0113] Example 1

[0114] Example 1 discloses a protective film that is resistant to fingerprints and nail polish, which is prepared by the following steps:

[0115] S1. The elastic polyurethane agent prepared in Preparation Example 6 was applied to the first release film by two-roller extrusion coating, and then cured by UV curing equipment to obtain an elastic polyurethane film layer with a thickness of 100 μm.

[0116] S2. The adhesive prepared in Preparation Example 2 is applied to one side of the elastic polyurethane film by double roller extrusion coating. A second release film is then attached to one side of the adhesive and cured by UV curing equipment to form an adhesive layer with a thickness of 40 μm on the surface of the polyurethane film.

[0117] S3. Peel off the first release film from the surface of the elastic polyurethane film layer. Apply the self-healing polyurethane agent prepared in Example 9 to the side of the elastic polyurethane film layer away from the adhesive layer using a two-roll extrusion coating. Then, use a UV curing device to cure the coating, forming a 40 μm thick self-healing coating. Next, apply the nano-fluorine-containing coating agent prepared in Example 13 to the upper surface of the self-healing coating. Dry at 100°C to form a 1 μm thick nano-anti-fingerprint coating. Then, place the prepared protective film at 25°C for 48 hours to cure, and then roll it up. This yields a fingerprint-resistant and nail-print-resistant protective film. See [link to relevant documentation]. Figure 1 It should be noted that the UV curing conditions mentioned above are all conventional UV curing conditions, and no specific restrictions are imposed here.

[0118] Example 2-3

[0119] The difference between Examples 2-3 and Example 1 lies in the different preparation process parameters, as detailed in Table 5 below.

[0120] Table 5 Parameter Table for Examples 1-3

[0121]

[0122]

[0123] Example 4

[0124] The difference between Example 4 and Example 1 is that the adhesive is derived from Preparation Example 4, while the rest is the same as in Example 1.

[0125] Example 5

[0126] The difference between Example 5 and Example 1 is that the adhesive is derived from Preparation Example 5, while the rest is the same as Example 1.

[0127] Example 6

[0128] The difference between Example 6 and Example 1 is that the self-healing polyurethane agent is derived from Preparation Example 12, while the rest is the same as Example 1.

[0129] Example 7

[0130] The difference between Example 7 and Example 1 is that the nano-fluorine-containing coating agent is derived from Preparation Example 16, while the rest is the same as Example 1.

[0131] Example 8

[0132] The difference between Example 8 and Example 1 is that the thickness of the elastic polyurethane film is 130 μm and the thickness of the self-healing polyurethane coating is 10 μm, while the rest is the same as in Example 1.

[0133] Example 9

[0134] The difference between Example 9 and Example 1 is that the thickness of the self-healing polyurethane coating is 60 μm, while the rest is the same as in Example 1.

[0135] Example 10

[0136] The difference between Example 10 and Example 1 is that the thickness of the adhesive layer is 10 μm, while the rest is the same as in Example 1.

[0137] Comparative Example

[0138] Comparative Example 1

[0139] The difference between Comparative Example 1 and Example 1 is that the adhesive was derived from the preparation of Comparative Example 1, while the rest is the same as Example 1.

[0140] Comparative Example 2

[0141] The difference between Comparative Example 2 and Example 1 is that the adhesive was derived from the preparation of Comparative Example 2, while the rest is the same as Example 1.

[0142] Performance testing

[0143] The following tests were conducted on the performance of the fingerprint-resistant and nail-print-resistant protective films prepared in Examples 1-10 and Comparative Examples 1-2:

[0144] 1. Water droplet angle test

[0145] Using a water droplet angle tester, place the protective film to be tested on the test platform and test the water droplet angle, which is recorded as the water droplet angle before wiping. Then, use a lint-free cloth soaked in anhydrous ethanol to wipe the protective film back and forth three times. After the anhydrous ethanol evaporates, continue to test the water droplet angle of the protective film and record it as the water droplet angle after wiping. Test and record the test results.

[0146] 2. Light transmittance test

[0147] Using a transmittance tester, with glass as the carrier plate, the transmittance of the glass is tested and calibrated. Then, a protective film is attached to the glass surface for transmittance testing, and the test data is recorded.

[0148] 3. Nail print test

[0149] Using a pressure testing machine with a load of 200g, a test fingernail is used to press down on the surface of the protective film. After holding the pressure for 2 seconds, the pressure is released, and the time it takes for the indentation created by the test fingernail on the surface of the protective film to disappear is calculated. The test data is then recorded.

[0150] 4. Edge warping test

[0151] The protective film was applied to the glass surface of the display screen and placed in an insulated chamber with a temperature of 85℃ and a humidity of 85% for 72 hours. The results were observed and recorded.

[0152] The following are the performance test data of the fingerprint-resistant and nail-print-resistant protective films prepared in Examples 1-10 and Comparative Examples 1-2, as detailed in Table 6 below.

[0153] Table 6 Performance data of Examples 1-10 and Comparative Examples 1-2

[0154]

[0155]

[0156] " / " indicates that it was not measured.

[0157] Based on Examples 1-3, 4-5, and 10, Comparative Examples 1-2, and Table 6, it can be concluded that the adhesive layer prepared using the adhesive of this application has good resilience and bonding stability, and can improve the nail mark resistance, light transmittance, and adhesion performance of the prepared protective film. Compared to Example 1, Examples 4-5 further optimized the hydroxyacrylate monomer, resulting in improved light transmittance of the protective film and a shorter nail mark recovery time. In Comparative Examples 1-2, the ratio of hydroxyacrylate monomer, dipentaerythritol hexaacrylate, and cyclohexanediol-1,4-diacrylate was changed, leading to decreased light transmittance of the protective film, edge lifting, and a significantly increased nail mark recovery time. This is likely because the hydroxyacrylate monomer, dipentaerythritol hexaacrylate, and cyclohexanediol-1,4-diacrylate have a good synergistic effect, further improving the resilience and adhesion stability of the adhesive layer. In Example 10, compared to Example 1, the adhesive layer thickness was reduced. While the light transmittance of the resulting protective film was slightly improved, the nail mark recovery time was significantly increased, and edge lifting occurred. This is likely because the resilience of the adhesive layer was reduced, increasing the overall recovery time of the protective film due to the adhesive's adhesion.

[0158] Combining Examples 1-3 and 6, Examples 8-9, and Table 6, it can be concluded that using the self-healing coating and elastic polyurethane film layer prepared in this application, and further optimizing the thickness of the self-healing coating and elastic polyurethane film layer, can further enhance the synergistic effect with the adhesive layer, thereby improving the nail mark resistance of the prepared protective film, while also improving light transmittance and reducing edge lifting. In Example 6, replacing an equal amount of diphenylmethane diisocyanate in the self-healing coating with polyurethane acrylate did not significantly change the light transmittance of the prepared protective film, but the nail mark recovery time increased. This may be because the synergistic effect of the equal amount of diphenylmethane diisocyanate and polyurethane acrylate was absent, reducing the flexibility of the self-healing coating and thus reducing the resilience of the prepared protective film. In Example 8, increasing the thickness of the elastic polyurethane film layer and decreasing the thickness of the self-healing coating significantly increased the nail mark recovery time of the protective film, possibly because the self-healing coating was too thin, reducing the nail mark resistance. In Example 9, increasing the thickness of the self-healing coating shortened the nail mark recovery time, but edge lifting occurred.

[0159] Combining Examples 1-3 and Example 7 with Table 6, it can be concluded that the nano-anti-fingerprint layer formed using the nano-fluorine-containing coating agent of this application has a good anti-fingerprint effect, and the water droplet angle can reach 115-118°. Compared with Example 1, Example 7 replaces heptadecanyltriethoxysilane in the nano-fluorine-containing coating agent with vinyltrimethoxysilane in an equal amount, and the anti-fingerprint performance of the resulting protective film is reduced.

[0160] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A protective film resistant to fingerprints and nail polish, characterized in that, The product comprises, from top to bottom, a nano-anti-fingerprint coating, a self-healing coating, an elastic polyurethane film layer, and an adhesive layer, which are sequentially bonded together. The nano-anti-fingerprint coating is a nano-fluorine-containing coating, the self-healing coating is a self-healing polyurethane coating, and the adhesive layer is obtained by curing an adhesive. The adhesive is made from the following raw materials in parts by weight: 60-80 parts of acrylic resin 10-20 parts of hydroxyacrylate monomer 5-8 parts of dipentaerythritol hexaacrylate 3-5 parts of cyclohexanediethanol-1,4-diacrylate 2-6 parts of methyl methacrylate 1-5 parts of isoborneol acrylate 3-6 parts of photoinitiator Antioxidant 1-3 parts; the hydroxy acrylate monomer is composed of tris(2-hydroxyethyl) isocyanurate triacrylate and hydroxyethyl methacrylate in a weight ratio of (1-3):1; the thickness of the adhesive layer is 30-40µm; The nano-fluorine-containing coating is obtained by curing a nano-fluorine-containing coating agent, which is prepared from the following raw materials in parts by weight: 40-60 parts of perfluorooctylpropyl acrylate 8-12 parts of methyl methacrylate 5-10 parts of nano-silica 1-3 parts of heptadecyltriethoxysilane 0.05-0.15 parts of benzoyl peroxide; the thickness of the nano-fluorine-containing coating is 1-5 µm; The self-healing polyurethane coating is obtained by curing a self-healing polyurethane agent, which is made from the following raw materials in parts by weight: 40-60 parts of polyurethane acrylate 10-20 parts of diphenylmethane diisocyanate 5-10 parts of hydroxyethyl acrylate 2-4 parts of photoinitiator Antioxidant 1-2 parts; the thickness of the self-healing polyurethane coating is 30-40µm; The elastic polyurethane film layer is obtained by curing an elastic polyurethane agent, which is made from the following raw materials in parts by weight: 40-60 parts of polyurethane acrylate 5-10 parts of hydroxyethyl acrylate 1-3 parts of photoinitiator 1-2 parts of antioxidant; the thickness of the elastic polyurethane film is 100-115µm.

2. The fingerprint-resistant and nail-print-resistant protective film according to claim 1, characterized in that, The photoinitiator is at least two combinations selected from 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxycyclohexylphenyl ketone, and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide.

3. A method for preparing a fingerprint-resistant and nail-print-resistant protective film as described in any one of claims 1-2, characterized in that, Includes the following steps: S1. Prepare an elastic polyurethane film layer; S2. Apply adhesive to one side of the elastic polyurethane film and cure it to form an adhesive layer on the surface of the elastic polyurethane film. S3. A self-healing coating and a nano anti-fingerprint coating are sequentially bonded to the side of the elastic polyurethane film away from the adhesive layer to obtain a protective film that is resistant to fingerprints and nail marks.

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