Grease-proof impact-resistant protective film and preparation method thereof

Abstract

The invention relates to the technical field of protective film processing, in particular to an anti-grease and anti-impact protective film and a preparation method thereof.The anti-grease and anti-impact protective film sequentially comprises an anti-grease coating, a base material layer, an elastomer layer and an adhesive layer, the anti-grease coating is obtained by coating the surface of the base material layer with anti-grease glue, and the elastomer layer is formed by coating the surface of the base material layer with the anti-grease glue; the oil-stain-resistant glue is prepared from the following raw materials in parts by weight: modified acrylic resin, a fluorocarbon solvent, perfluoroalkoxy resin, a defoaming agent, a first photoinitiator, n-butyl acetate and the balance of n-butyl alcohol; the elastomer layer is obtained by coating the surface of the base material layer with elastomer glue, and the elastomer glue is prepared from the following raw materials in parts by weight: polyurethane acrylate resin, tetrahydrofurfuryl acrylate, an acrylate monomer capable of being crosslinked with tetrahydrofurfuryl acrylate, and a second photoinitiator; residual grease and stains on the surface of the protective film are easier to wipe, a screen can be recovered to a clean state only by slightly wiping with a tissue, and the impact resistance is high.

Description

Technical Field

[0001] The present application relates to the technical field of protective film processing, and more specifically, to a grease-proof and impact-resistant protective film and a preparation method thereof. Background Art

[0002] As an important accessory for protecting electronic screens, 3C protective films have become an indispensable part of 3C electronic products. They can provide electronic screens with functions such as anti-scratch, anti-fingerprint and anti-explosion, effectively extending the service life of the equipment and improving user experience. With the rapid development of the smartphone and tablet computer markets, the demand for 3C protective films continues to rise, further highlighting its important position in the electronic products industry, which not only brings huge economic benefits to enterprises, but also provides users with more abundant choices.

[0003] At present, the traditional 3C protective film includes a scratch-resistant hardened layer, a substrate layer and an adhesive layer in sequence. The scratch-resistant hardened layer has a high hardness and can effectively resist scratches and wear in daily use; the explosion-proof function is achieved through the toughness and strength of the substrate layer to prevent the screen from breaking after being impacted, and the glass panel from shattering and scattering, thereby reducing the hidden damage of the glass panel; the adhesive layer is used to bond the 3C protective film to the electronic screen.

[0004] However, during use, it is found that the anti-scratch hardened layer is easily contaminated by fingerprints, skin oil, sweat and cosmetics, and is difficult to wipe off, which affects hygiene and the visual clarity and picture effect of the screen. More importantly, although the substrate layer can prevent the glass fragments from flying after the screen is impacted to a certain extent, it cannot significantly improve the impact resistance of the screen, resulting in the risk of damage to the screen. Therefore, there is still an urgent need to improve the existing 3C protective film in terms of anti-pollution and impact resistance. Summary of the invention

[0005] In order to further improve the anti-oil, anti-pollution, anti-fingerprint and impact resistance of the 3C protective film, the present application provides an anti-oil and anti-impact protective film and a preparation method thereof.

[0006] In a first aspect, the present application provides a grease-proof and impact-resistant protective film, which adopts the following technical solution: A grease-proof and impact-resistant protective film, the grease-proof and impact-resistant protective film comprises an anti-oil coating, a substrate layer, an elastomer layer and an adhesive layer in sequence, wherein the anti-oil coating is obtained by coating the surface of the substrate layer with anti-oil glue, and the anti-oil glue is prepared from the following raw materials in parts by weight: Modified acrylic resin 30-60% Fluorocarbon solvent 10-15% Perfluoroalkoxy resin 10-15% Defoamer 2-5% First photoinitiator 1-3% n-Butyl acetate 10-20% The remainder is n-butanol; The elastomer layer is obtained by coating the surface of the substrate layer with elastomer water, and the elastomer glue is prepared from the following raw materials in parts by weight: Polyurethane acrylate resin 50-70% Tetrahydrofurfuryl acrylate 15-30% 10-15% of acrylate monomer capable of crosslinking with tetrahydrofurfuryl acrylate Second photoinitiator 3-5%.

[0007] By adopting the above technical scheme, the grease stains on the surface of the grease-proof and impact-resistant protective film are easier to wipe off. The protective film can be restored to a natural and clean state by simply wiping it lightly with a paper towel, while also having an enhanced impact buffering function.

[0008] The anti-oil coating can prevent the adhesion of stains such as fingerprints, skin oils, sweat and cosmetics, and is easy to clean even if they are attached, thereby maintaining the hygiene and visual clarity of the screen. The anti-oil coating uses modified acrylic resin, fluorocarbon solvents and perfluoroalkoxy resins and other raw materials to form a coating with extremely low surface energy, which effectively resists the adhesion of stains such as fingerprints, skin oils, sweat and cosmetics. Even if it is contaminated, it is easy to clean, maintaining the hygiene and visual clarity of the screen. Among them, the modified acrylic resin is a film-forming substance that provides the basic properties and adhesion of the coating; the fluorocarbon solvent and the perfluoroalkoxy resin contain fluorine elements, which have extremely low surface energy, making it difficult for the coating surface to be wetted and attached by stains such as grease, thereby achieving the effect of preventing oil stains; the defoaming agent prevents the coating from generating bubbles during the coating process, which affects the quality and appearance of the coating; the first photoinitiator triggers the cross-linking reaction of the resin under ultraviolet light, so that the coating solidifies and improves the hardness and wear resistance of the coating.

[0009] The elastomer layer is composed of raw materials such as polyurethane acrylate resin, tetrahydrofurfuryl acrylate and acrylate monomers that can cross-link with tetrahydrofurfuryl acrylate. It has excellent elasticity and toughness, can significantly improve the screen's ability to resist damage when impacted, has a repair effect, and can absorb and disperse impact force to prevent the screen from being broken or damaged due to external impact, thereby protecting the electronic components inside the screen from damage. Among them, polyurethane acrylate resin, as the main film-forming substance of the elastomer layer, provides excellent elasticity and toughness; tetrahydrofurfuryl acrylate and acrylate monomers copolymerize with polyurethane acrylate resin to further enhance the elasticity and toughness of the coating; the second photoinitiator also triggers the cross-linking reaction of the resin under ultraviolet irradiation, so that the elastomer layer is cured to form a protective layer with high strength and high elasticity.

[0010] In this application, the anti-oil coating, substrate layer and elastomer layer work together to provide all-round protection for the screen of 3C electronic products from anti-fouling, basic protection to enhanced impact resistance. It not only improves the anti-fouling and impact resistance of the protective film, but also enhances its durability and service life, reduces the frequency of replacing the protective film, and reduces the cost of use.

[0011] Preferably, the first photoinitiator is one or more of 1-hydroxy-cyclohexyl-phenyl ketone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and 2-hydroxy-2-methyl-1-phenylacetone.

[0012] Preferably, the second photoinitiator is one or more of 1-hydroxy-cyclohexyl-phenyl ketone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and 2-hydroxy-2-methyl-1-phenylacetone.

[0013] Preferably, the modified acrylic resin is obtained by mixing polyester modified acrylic resin and epoxy modified acrylic resin in a weight ratio of 1:(3-5).

[0014] By adopting the above technical scheme and optimizing the type and amount of modified acrylic resin, the bonding strength of the anti-oil glue can be further improved. At the same time, the mixed use of the two can further improve the density of the anti-oil layer and increase the anti-pollution performance and scratch resistance of the anti-oil layer.

[0015] Preferably, the polyurethane acrylate resin is obtained by mixing a polyurethane acrylate resin with a functionality of 6-10 and a polyurethane acrylate resin with a functionality of 2-5 in a weight ratio of (3-5):1.

[0016] By adopting the above technical solution, the type and functionality of polyurethane acrylate resin are optimized to form an elastomer layer with excellent elasticity and toughness, which can effectively absorb and disperse impact force when impacted to prevent damage to the screen. Among them, the polyurethane acrylate resin with higher functionality has a longer molecular chain and can form more cross-linking points, thereby giving the elastomer layer higher strength and toughness. The polyurethane acrylate resin with lower functionality has better flexibility and fluidity, which helps to improve the overall elasticity of the elastomer layer. At the same time, the polyurethane acrylate resin with lower functionality has good fluidity, and the use of both is conducive to adjusting the fluidity of the elastomer glue and facilitating coating.

[0017] Preferably, the fluorocarbon solvent is obtained by mixing perfluoroisobutyl ester and perfluoropropanol in a weight ratio of (5-8):3.

[0018] By adopting the above technical scheme, perfluoroisobutyl ester and perfluoropropanol are used in a specific proportion, which can more effectively dissolve the modified acrylic resin and perfluoroalkoxy resin in the anti-oil glue, while reducing the surface tension of the anti-oil glue, which helps the anti-oil layer to form a tighter bond on the surface of the substrate layer and improve the adhesion of the anti-oil layer.

[0019] Preferably, the acrylate monomer capable of cross-linking with tetrahydrofurfuryl acrylate includes at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, methacrylic acid, acrylamide, N-hydroxymethyl acrylamide, diacetone acrylamide and glycidyl methacrylate.

[0020] By adopting the above technical scheme, the types of acrylic acid monomers that can be cross-linked with tetrahydrofurfuryl acrylate are optimized, the cross-linking of acrylic acid ester monomers that can be cross-linked with tetrahydrofurfuryl acrylate and tetrahydrofurfuryl acrylate is promoted, the elasticity and toughness of the elastic layer are enhanced, and the damage resistance and recovery ability of the anti-grease and impact-resistant protective film during impact are improved.

[0021] Preferably, the adhesive layer is any one of a silicone layer, an acrylic adhesive layer, an OCA optical adhesive layer, a PU adhesive layer or a pressure-sensitive adhesive layer.

[0022] By adopting the above technical solution, the type of adhesive layer is optimized, and the bonding strength of the anti-grease and anti-impact protective film is adjusted to meet the needs of different bonding viscosities.

[0023] Preferably, the defoamer is a silicone defoamer.

[0024] By adopting the above technical solution, the organosilicon defoamer can be well compatible with other components in the anti-oil glue, and the performance of the anti-oil glue will not be reduced due to incompatibility. At the same time, the dispersibility of the organosilicon defoamer in the anti-oil glue is also good, and it can be evenly distributed in the anti-oil glue to ensure the uniformity of the defoaming effect.

[0025] Preferably, the thickness of the anti-oil layer is 2-10 μm, the thickness of the substrate layer is 50-150 μm, the thickness of the elastomer layer is 25-125 μm, and the thickness of the adhesive layer is 20-100 μm.

[0026] By adopting the above technical solution and optimizing the thickness of the anti-oil layer, substrate layer, elastomer layer and adhesive layer, an anti-fouling barrier can be effectively formed to prevent the adhesion of fingerprints, grease and other stains, while not being too thick to affect the transparency and feel of the overall protective film. While ensuring sufficient strength and toughness of the substrate layer, lightweight and cost-effectiveness are also taken into consideration. It ensures that the elastomer layer can fully absorb and disperse the impact force when impacted, effectively protecting the screen from damage. At the same time, the appropriate thickness also maintains the flexibility and fit of the protective film, making it easy to install and use. It ensures a strong bond between the protective film and the screen, without affecting the transparency and feel of the protective film due to an overly thick adhesive layer.

[0027] Preferably, the substrate layer is one of a PET substrate layer, a PP substrate layer, a TPU substrate layer, a PBT substrate layer, a PE substrate layer, a PC substrate layer, a PP substrate layer or a PU substrate layer.

[0028] By adopting the above technical solution, the type of substrate layer is optimized, so that the anti-grease and anti-impact protective film can meet different needs and expand its scope of use.

[0029] In a second aspect, the present application provides a method for preparing a grease-proof and impact-resistant protective film, which adopts the following technical solution: A method for preparing a grease-proof and impact-resistant protective film comprises the following preparation steps: S1, uniformly stirring a modified acrylic resin, a fluorocarbon solvent, a perfluoroalkoxy resin, a defoamer, a first photoinitiator, n-butyl acetate and n-butanol to obtain an anti-oil glue, and then coating the anti-oil glue on the surface of the substrate layer through a micro-concave coating process, UV curing, and ripening to obtain a substrate layer containing an anti-oil layer; S2, mixing polyurethane acrylate resin, tetrahydrofurfuryl acrylate, acrylate monomer and second photoinitiator evenly to obtain elastomer glue, coating the elastomer glue on one side of the substrate layer away from the anti-oil layer, drying, aging, and then UV curing to form an elastomer layer to obtain a semi-finished product; S3, coating the adhesive on the surface of the elastomer layer, curing it to form an adhesive layer, and pasting a release film to obtain a grease-proof and impact-resistant protective film.

[0030] By adopting the above technical solution, the preparation method adopts efficient and environmentally friendly production processes such as micro-concave coating and ultraviolet UV curing, which not only improves production efficiency but also reduces production costs.

[0031] Using the micro-concave coating process, the anti-oil glue is evenly and accurately coated on the surface of the substrate layer, and through UV curing and aging treatment, the anti-oil layer is closely combined with the substrate layer to form a surface that is difficult to be attached to stains such as grease and fingerprints. This process and formula together ensure that the protective film has excellent anti-grease performance and keeps the screen clean and visually clear for a long time. Elastomer glue is applied on the other side of the substrate layer, and through drying, aging and UV curing, a layer of elastomer layer with high elasticity and toughness is formed. This elastomer layer can effectively absorb and disperse external impact force, protect the screen from damage, and improve the impact resistance of the screen. Adhesive is applied to the surface of the elastomer layer and cured to ensure a firm bond between the protective film and the electronic screen. At the same time, the release film can protect the adhesive layer from contamination and damage during transportation and storage, which is convenient for subsequent use and installation.

[0032] In summary, this application has the following beneficial effects: 1. Excellent anti-grease performance: The anti-grease coating can effectively resist the adhesion of stains such as fingerprints, skin oils, sweat and cosmetics. Even if it is contaminated, it is easy to clean, maintaining the hygiene and visual clarity of the screen.

[0033] 2. Enhanced impact resistance: The elastomer layer can significantly improve the screen's resistance to damage when impacted and reduce the risk of screen breakage through its high elasticity and toughness.

[0034] 3. Good bonding performance: The adhesive layer ensures a firm bond between the protective film and the electronic screen, preventing the protective film from falling off or shifting during use. DETAILED DESCRIPTION Example

[0035] The substrate layer is a PET substrate layer purchased from Dongguan Xinda Plastic Insulation Material Co., Ltd., with a thickness of 50 μm.

[0036] Polyester modified acrylic resin was purchased from Jining Tangyi Chemical Co., Ltd., model number s-747.

[0037] Perfluoroalkoxy resin was purchased from Mesodac (Suzhou) New Materials Co., Ltd., model 340.

[0038] Epoxy modified acrylic resin was purchased from Shandong Huling New Materials Co., Ltd., model number WDS-1225.

[0039] The organosilicon defoamer was purchased from Tianjin Ruike Chemical Trading Co., Ltd., model number RP-6068.

[0040] Example 1 A grease-proof and impact-resistant protective film is prepared by the following method: S1, 600g of modified acrylic resin (polyester modified acrylic resin), 100g of fluorocarbon solvent (perfluoroisobutyl ester), 100g of perfluoroalkoxy resin, 20g of defoamer (organic silicone defoamer), 10g of first photoinitiator (1-hydroxy-cyclohexyl-phenyl ketone), 100g of n-butyl acetate and 90g of n-butanol are stirred evenly to obtain anti-oil stain glue, and then the anti-oil stain glue is coated on the surface of the substrate layer (PET substrate layer) through a micro-concave coating process, UV-cured, and matured to obtain a substrate layer containing an anti-oil stain layer; S2, 500g of polyurethane acrylate resin, 300g of tetrahydrofurfuryl acrylate, 150g (hydroxyethyl acrylate) of acrylate monomer that can be crosslinked with tetrahydrofurfuryl acrylate, and 50g (1-hydroxy-cyclohexyl-phenyl ketone) of the second photoinitiator are stirred evenly to obtain elastomer glue, and elastomer glue is applied on one side of the PET substrate layer away from the anti-greasy layer, dried, slaking, and then ultraviolet UV curing to form an elastomer layer to obtain a semi-finished product; S3, coating the adhesive on the surface of the elastomer layer, curing it to form an adhesive layer, and pasting a release film to obtain a grease-proof and impact-resistant protective film.

[0041] The thickness of the oil-repellent layer was 2 μm, the thickness of the base material layer was 50 μm, the thickness of the elastomer layer was 25 μm, and the thickness of the adhesive layer was 20 μm.

[0042] The functionality of the polyurethane acrylate resin is 2, and it is from Sartomer Company, model number is CN9007, and the viscosity at 60° C. is 4500 cP.

[0043] The adhesive was silicone, model KL-9301 purchased from Shenzhen Kanglibang Technology Co., Ltd.

[0044] The difference between Example 2-3 and Example 1 is that the types, amounts and parameters of raw materials used to prepare the anti-grease and impact-resistant protective film are different. The specific differences are shown in Table 1: Table 1 Types, amounts and parameters of raw materials used in preparing anti-grease and impact-resistant protective films in Examples 1-3 Example 4 A grease-proof and impact-resistant protective film. The difference between this embodiment and embodiment 1 is that the modified acrylic resin is obtained by mixing polyester-modified acrylic resin and epoxy-modified acrylic resin in a weight ratio of 1:3.

[0045] Example 5 A grease-proof and impact-resistant protective film. The difference between this embodiment and embodiment 1 is that the modified acrylic resin is obtained by mixing polyester-modified acrylic resin and epoxy-modified acrylic resin in a weight ratio of 1:5.

[0046] Example 6 A grease-proof and impact-resistant protective film. The difference between this embodiment and embodiment 4 is that the modified acrylic resin is epoxy-modified acrylic resin.

[0047] Example 7 A grease-proof and impact-resistant protective film. The difference between this embodiment and embodiment 1 is that the fluorocarbon solvent is obtained by mixing perfluoroisobutyl ester and perfluoropropanol in a weight ratio of 5:3.

[0048] Example 8 A grease-proof and impact-resistant protective film. The difference between this embodiment and embodiment 4 is that the fluorocarbon solvent is obtained by mixing perfluoroisobutyl ester and perfluoropropanol in a weight ratio of 8:3.

[0049] Example 9 A grease-proof and impact-resistant protective film. The difference between this embodiment and embodiment 1 is that the acrylate monomer that can be cross-linked with tetrahydrofurfuryl acrylate is obtained by mixing hydroxyethyl acrylate and hydroxyethyl methacrylate in a weight ratio of 1:1.

[0050] Example 10 A grease-proof and impact-resistant protective film. The difference between this embodiment and embodiment 1 is that the polyurethane acrylate resin is obtained by mixing a polyurethane acrylate resin with a functionality of 6 and a polyurethane acrylate resin with a functionality of 2 in a weight ratio of 3:1.

[0051] The polyurethane acrylate resin with a functionality of 6 is a product of Nippon Synthetic Chemical Co., Ltd., model number 7605B, and has a viscosity of 2000 cP at 60°C.

[0052] Embodiment 11 A grease-proof and impact-resistant protective film. The difference between this embodiment and embodiment 4 is that the polyurethane acrylate resin is obtained by mixing a polyurethane acrylate resin with a functionality of 10 and a polyurethane acrylate resin with a functionality of 5 in a weight ratio of 5:1.

[0053] The polyurethane acrylate resin with a functionality of 10 is a product of Nippon Synthetic Chemical Co., Ltd., model number 1700B, and has a viscosity of 2000 cP at 60°C.

[0054] The polyurethane acrylate resin with a functionality of 5 is a product of Dongguan Jingshuo Chemical Technology Co., Ltd., model number is UinCure U-20D, and the viscosity at 60°C is 2500 cP.

[0055] Comparative Example Comparative Example 1 A grease-proof and impact-resistant protective film. The difference between this comparative example and Example 1 is that acrylic resin is used instead of modified acrylic resin.

[0056] Acrylic resin was purchased from Shandong Huling New Materials Co., Ltd., model PT-2060A.

[0057] Comparative Example 2 A grease-proof and impact-resistant protective film. The difference between this comparative example and Example 1 is that polytetrafluoroethylene is used instead of perfluoroalkoxy resin.

[0058] Polytetrafluoroethylene was purchased from Shanghai Yijing Import and Export Co., Ltd. with the brand number 2099X 131060A.

[0059] Comparative Example 3 A grease-proof and impact-resistant protective film. The difference between this comparative example and Example 1 is that ethyl acetate is used instead of the fluorocarbon solvent.

[0060] Comparative Example 4 A grease-proof and impact-resistant protective film. The difference between this comparative example and Example 1 is that acrylic resin is used instead of polyurethane acrylate resin.

[0061] Acrylic resin was purchased from Shandong Huling New Materials Co., Ltd., model PT-2060A.

[0062] Comparative Example 5 A grease-proof and impact-resistant protective film. The difference between this comparative example and Example 1 is that hydroxyethyl methacrylate is used instead of tetrahydrofurfuryl acrylate.

[0063] Comparative Example 6 A grease-proof and impact-resistant protective film. The difference between this comparative example and Example 1 is that methyl acrylate is used instead of hydroxyethyl acrylate.

[0064] Detection method / test method Water drop angle test: The test is carried out using a water drop angle measuring instrument, and the test standard refers to GB / T30693-2014. The larger the water drop angle, the better the anti-fingerprint performance.

[0065] Oil drop angle test: The oil drop angle measuring instrument is used for testing, and the test standard refers to GB / T30693-2014. The larger the drop angle, the better the oil resistance.

[0066] Grease paper towel wiping test: drop 0.5g rapeseed oil on the surface of the anti-oil layer and spread it evenly, then wipe it with a grease paper towel. After wiping once, replace it with a new grease paper towel and wipe it again. Count the number of times it takes to wipe clean.

[0067] Wipe with grease cloth: drop 0.5g rapeseed oil on the surface of the anti-oil layer and spread it evenly, then wipe it with grease cloth. After one wipe, replace the grease cloth and wipe it again. Count how many times it takes to wipe clean.

[0068] 1kg pencil scratch test: Use a pencil hardness tester, adjust the angle between the pencil and the anti-grease and impact-resistant protective film to 45°, apply a load of 1kg, scratch the anti-grease and impact-resistant protective film, and record the scratch recovery time or observe whether the scratch is restored.

[0069] 1kg ball impact test at different heights: The anti-grease and impact-resistant protective films prepared in the examples and comparative examples were pasted on the glass and left to stand for 2 hours. The film was placed on a horizontal table with the protective film facing upwards. A 1kg iron ball was dropped freely from 0.5m, 1m, and 1.5m above the horizontal table to observe whether the glass was broken. The experimental data are shown in Table 2: Table 2 Experimental data of Examples 1-11 and Comparative Examples 1-6 Comparing Example 1 with Comparative Examples 1-3, the values ​​of the water drop angle and the oil drop glue in Comparative Examples 1-3 are both smaller than those in Example 1; the number of wiping times of Comparative Example 1 during wiping with a grease paper towel and a grease cloth is much greater than that of Example 1; Comparative Examples 2-3 both experienced 20 times of whitening and fogging during wiping with a grease paper towel and a grease cloth; Comparative Example 1 was not repaired in a 1kg pencil scratch; the repair time of Comparative Example 2 in a 1kg pencil scratch was much longer than that of Example 1; Comparative Example 1 was damaged in a 1.5m height, 1kg falling ball impact performance test, indicating that in the present application, by using a modified acrylic resin, a fluorocarbon solvent and a perfluoroalkoxy resin together to prepare an anti-oil layer, the anti-oil, easy-to-clean and repair properties of the anti-oil and anti-impact protective film can be greatly improved.

[0070] Comparing Comparative Examples 4-6 with Example 1, Comparative Examples 4-6 were not repaired in the 1kg pencil scratch; Comparative Example 4 was damaged in the 1kg drop ball impact performance test at a height of 0.5m; Comparative Examples 5-6 were damaged in the 1kg drop ball impact performance test at a height of 0.5m, indicating that in the present application, by preparing the elastomer layer with polyurethane acrylate resin, tetrahydrofurfuryl acrylate and acrylate monomer that can be cross-linked with tetrahydrofurfuryl acrylate, it is beneficial to improve the impact resistance and repair performance of the anti-grease and impact-resistant protective film.

[0071] Comparing Example 1 with Example 4-5, the values ​​of the water drop angle and the oil drop glue in Example 4-5 are greater than those in Example 1; the number of wiping times of Example 4-5 during wiping with a grease paper towel and wiping with a grease cloth is less than that of Example 1; the repair time of Example 4-5 in a 1kg pencil scratch is less than that of Example 1; Comparing Example 4 with Example 6, the values ​​of the water drop angle and the oil drop glue in Example 4 are greater than those in Example 6; the number of wiping times of Example 4 in the process of wiping with a grease paper towel and wiping with a grease cloth is less than that of Example 6; the repair time of Example 4 in a 1kg pencil scratch is less than that of Example 6; From the results of Examples 1, 4-5 and Examples 4, 6, it can be seen that the use of polyester-modified acrylic resin and epoxy-modified acrylic resin in a specific ratio is beneficial to improving the anti-oil, easy-to-clean and repair properties of the anti-grease and impact-resistant protective film.

[0072] Comparing Example 1 with Example 7, the values ​​of the water drop angle and the oil drop glue in Example 7 are greater than those in Example 1; the number of wiping times of Example 7 during wiping with a grease paper towel and wiping with a grease cloth is less than that of Example 1; the repair time of Example 7 in a 1kg pencil scratch is less than that of Example 1; Comparing Example 4 with Example 8, the values ​​of the water drop angle and the oil drop glue in Example 8 are greater than those in Example 4; the number of wiping times of Example 8 in the process of wiping with a grease paper towel and wiping with a grease cloth is less than that of Example 4; the repair time of Example 8 in a 1kg pencil scratch is less than that of Example 4; From the results of Examples 1 and 7 and Examples 4 and 8, it can be seen that the use of perfluoroisobutyl ester and perfluoro-1-propanol together is beneficial to improving the anti-oil stain, easy cleaning and repair performance of the anti-grease and impact-resistant protective film.

[0073] Comparing Example 1 with Example 9, the repair time in Example 9 in a 1 kg pencil scratch is longer than that in Example 1, indicating that the repair performance of the anti-grease and impact-resistant protective film can be improved by optimizing the type of acrylate monomer that can be cross-linked with tetrahydrofurfuryl acrylate.

[0074] Comparing Example 1 with Example 10, the repair time in Example 10 in a 1kg pencil scratch is longer than that in Example 1; Comparing Example 1 with Example 11, the repair time in Example 11 in a 1kg pencil scratch is longer than that in Example 4; From the results of Examples 1 and 9 and Examples 4 and 11, it can be seen that the repair performance of the anti-grease and impact-resistant protective film can be improved by using polyurethane acrylate resins with different functionalities in common.

[0075] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A grease-proof and impact-resistant protective film, characterized in that: The anti-grease and impact-resistant protective film comprises an anti-oil coating, a substrate layer, an elastomer layer and an adhesive layer in sequence, wherein the anti-oil coating is obtained by coating the surface of the substrate layer with anti-oil glue, and the anti-oil glue is prepared from the following raw materials in parts by weight: Modified acrylic resin 30-60% Fluorocarbon solvent 10-15% Perfluoroalkoxy resin 10-15% Defoamer 2-5% First photoinitiator 1-3% n-Butyl acetate 10-20% The remainder is n-butanol; The elastomer layer is obtained by coating the surface of the substrate layer with elastomer water, and the elastomer glue is prepared from the following raw materials in parts by weight: Polyurethane acrylate resin 50-70% Tetrahydrofurfuryl acrylate 15-30% 10-15% of acrylate monomer capable of crosslinking with tetrahydrofurfuryl acrylate The second photoinitiator is 3-10%.

2. The grease-proof and impact-resistant protective film according to claim 1, characterized in that: The modified acrylic resin is obtained by mixing polyester modified acrylic resin and epoxy modified acrylic resin in a weight ratio of 1: (3-5).

3. The grease-proof and impact-resistant protective film according to claim 2, characterized in that: The polyurethane acrylate resin is obtained by mixing a polyurethane acrylate resin with a functionality of 6-10 and a polyurethane acrylate resin with a functionality of 2-5 in a weight ratio of (3-5):

1.

4. The grease-proof and impact-resistant protective film according to claim 1, characterized in that: The fluorocarbon solvent is obtained by mixing perfluoroisobutyl ester and perfluoropropanol in a weight ratio of (5-8):

3.

5. The grease-proof and impact-resistant protective film according to claim 4, characterized in that: The acrylic acid ester monomer capable of cross-linking with tetrahydrofurfuryl acrylate includes at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, methacrylic acid, acrylamide, N-hydroxymethyl acrylamide, diacetone acrylamide and glycidyl methacrylate.

6. The grease-proof and impact-resistant protective film according to claim 4, characterized in that: The adhesive layer is any one of a silicone layer, an acrylic layer, an OCA optical layer, a PU layer or a pressure-sensitive layer.

7. The grease-proof and impact-resistant protective film according to claim 1, characterized in that: The defoamer is an organosilicon defoamer.

8. The grease-proof and impact-resistant protective film according to claim 1, characterized in that: The thickness of the anti-oil layer is 2-10 μm, the thickness of the substrate layer is 50-150 μm, the thickness of the elastomer layer is 25-125 μm, and the thickness of the adhesive layer is 20-100 μm.

9. The grease-proof and impact-resistant protective film according to claim 1, characterized in that: The substrate layer is one of a PET substrate layer, a PP substrate layer, a TPU substrate layer, a PBT substrate layer, a PE substrate layer, a PC substrate layer, a PP substrate layer or a PU substrate layer.

10. A method for preparing the grease-proof and impact-resistant protective film according to any one of claims 1 to 9, characterized in that: The method comprises the following preparation steps: S1, uniformly stirring a modified acrylic resin, a fluorocarbon solvent, a perfluoroalkoxy resin, a defoamer, a first photoinitiator, n-butyl acetate and n-butanol to obtain an anti-oil glue, and then coating the anti-oil glue on the surface of the substrate layer through a micro-concave coating process, UV curing, and ripening to obtain a substrate layer containing an anti-oil layer; S2, mixing polyurethane acrylate resin, tetrahydrofurfuryl acrylate, acrylate monomer and second photoinitiator evenly to obtain elastomer glue, coating the elastomer glue on one side of the substrate layer away from the anti-oil layer, drying, aging, and then UV curing to form an elastomer layer to obtain a semi-finished product; S3, coating the adhesive on the surface of the elastomer layer, curing it to form an adhesive layer, and pasting a release film to obtain a grease-proof and impact-resistant protective film.

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