Anti-fingerprint scratch-resistant coating composite film and preparation method thereof

Abstract

The invention relates to the technical field of decorative materials, and discloses an anti-fingerprint scratch-resistant coating composite film and a preparation method thereof, one surface of a base film is coated with an anti-fingerprint coating, then the surface coated with the coating is covered with a release film with the surface roughness of 20-40 [mu] m, and then a coating with the hardness of HB-F and the surface roughness of 10-25 [mu] m is formed through curing, so that the anti-fingerprint scratch-resistant coating composite film is obtained. The coating on the surface of the coating composite film not only can meet the requirements of fingerprint resistance and scratch resistance, but also has excellent crack resistance, and is suitable for being applied to a decorative film for coating a plate.

Description

Technical Field

[0001] The invention relates to the technical field of decorative materials, and in particular to an anti-fingerprint and scratch-resistant coating composite film and a preparation method thereof. Background Art

[0002] Film-coated board is a new type of decorative material, which is covered with a film that plays a protective and decorative role on the surface of the board. It is widely welcomed due to its unique texture and rich appearance. In order to reduce the adhesion of stains such as fingerprints and keep the coating surface clean, the decorative film used to cover the board needs to have anti-fingerprint effect. At the same time, in order to reduce the scratching and wear of the coating and extend the service life of the decorative film, the coating is also required to have good scratch resistance. At present, the anti-fingerprint effect of the decorative film is mainly achieved by coating an anti-fingerprint coating on the base film and forming a coating with anti-fingerprint function on the surface of the film. However, in order to ensure good scratch resistance, the existing anti-fingerprint coatings with both anti-fingerprint and scratch resistance often need to add more high-hardness resins to the formula to make the formed coating have high hardness. Although this can meet the basic requirements of anti-fingerprint and scratch resistance, the tensile properties of the coating are poor, and the coating is prone to cracking during the processing of the decorative film coated board. Therefore, it is necessary to develop a coating that can meet the requirements of anti-fingerprint and scratch resistance and has excellent crack resistance and a corresponding coating composite film. Summary of the invention

[0003] Based on the technical problems existing in the background technology, the present invention proposes an anti-fingerprint and scratch-resistant coating composite film and a preparation method thereof.

[0004] The present invention provides a method for preparing an anti-fingerprint and scratch-resistant coating composite film, which comprises coating an anti-fingerprint coating on one surface of a base film, and then laminating a release film with a surface roughness of 20 to 40 μm on the surface coated with the coating, and curing to form a coating with a surface roughness of 10 to 25 μm. The anti-fingerprint coating comprises the following raw materials in parts by weight: 20-100 parts of polyurethane acrylate, 20-100 parts of organic fluorine-modified polyurethane acrylate, 0.1-100 parts of diluent, 0.1-5 parts of defoaming agent, 0.1-5 parts of leveling agent and 0.1-2 parts of wax emulsion.

[0005] In the present invention, since the anti-fingerprint coating formula contains fluorine elements and a lubricant, the coating has certain lubricity and hydrophobicity; at the same time, the surface roughness of the coating is controlled within a suitable range by curing after laminating a release film with a suitable surface roughness, forming a synergistic enhancement effect on the anti-fingerprint performance, thereby ensuring excellent anti-fingerprint effect and scratch resistance effect; when the surface roughness of the coating is low, the anti-fingerprint effect of the coating is poor; when the surface roughness of the coating is high, the resistance to scratch formation becomes larger, resulting in poor scratch resistance.

[0006] In the present invention, under the premise of achieving excellent anti-fingerprint and scratch resistance effects, due to the use of an anti-fingerprint coating with low hardness and high flexibility, the coating can also ensure excellent anti-cracking performance, so that the coating is not prone to cracking or falling off when bending processing is required, and is suitable for decorative films for covering panels.

[0007] Preferably, the polyurethane acrylate is a 6-8 functional polyurethane acrylate.

[0008] Preferably, the diluent is at least one of tripropylene glycol diacrylate, 2-phenoxyethyl acrylate, isononyl acrylate, ethoxylated bisphenol A dimethacrylate, pentaerythritol triacrylate, ethoxylated trimethylolpropane triacrylate, tri(2-hydroxyethyl)isocyanuric acid triacrylate, dipentaerythritol hexaacrylate, and 1,6-hexanediol diacrylate.

[0009] Preferably, the viscosity of the anti-fingerprint coating is 5000-10000 cps.

[0010] Preferably, the thickness of the release film is 0.03-0.08 mm.

[0011] Preferably, the lamination pressure is 2-4 kg / cm 2 .

[0012] Preferably, the curing is EB irradiation curing, the voltage of the EB irradiation curing is 100-200 kV, and the irradiation dose is 10-30 kGy.

[0013] In the present invention, the raw materials of the anti-fingerprint coating may further include a photoinitiator, and the mass fraction of the photoinitiator is 0.1 to 1 part; when the raw materials of the anti-fingerprint coating include a photoinitiator, the curing is UV curing or EB irradiation curing. The specific type of the photoinitiator is not limited, and the photoinitiator commonly used in the art can be used, for example, it can be photoinitiator 184, photoinitiator TPO, photoinitiator 1173.

[0014] Preferably, the coating has a thickness of 50-100 μm.

[0015] Preferably, the hardness of the coating is HB~F, and the hardness test method can refer to the 4.57 paint film hardness determination in GB17657-2013.

[0016] Preferably, the base film is a PVC film, a PP film, a PET film or a prepreg paper.

[0017] In the present invention, the coating method is not specifically limited, and conventional coating methods in the art may be used, such as anilox roller coating, comma blade coating, and micro-concave roller coating.

[0018] In the present invention, the release film with a surface roughness of 20 to 40 μm can be prepared by a typical method in the art for manufacturing a film with a roughened surface, such as an embossing method. Specifically, the preparation method of the release film with a surface roughness of 20 to 40 μm by the embossing method can be: mixing raw materials, plasticizing and extruding, casting and embossing, cooling, and winding; in the above preparation method, the surface roughness of the release film is controlled to be 20 to 40 μm by controlling the embossing texture and the embossing depth.

[0019] Preferably, the extrusion temperature is 210-240°C.

[0020] In the present invention, the material of the release film is not specifically limited, and any conventional material in the art may be used, such as PP, PET or PE.

[0021] Preferably, the release film is a PP release film. Preferably, the PP release film comprises the following raw materials in parts by weight: 100 parts of homopolypropylene, 0.1-0.5 parts of nucleating agent, 0.1-0.5 parts of antioxidant, 0.1-0.3 parts of lubricant, and 0.1-1 parts of PPA processing aid.

[0022] Preferably, the nucleating agent is at least one of an aromatic phosphate nucleating agent, a sorbitol nucleating agent, a carboxylic acid metal salt nucleating agent, a dehydroabietic acid and its salt nucleating agent, and a branched amide nucleating agent.

[0023] Preferably, the antioxidant is at least one of an aromatic amine antioxidant and a hindered phenol antioxidant, and preferably at least one of antioxidant DLTP, antioxidant 168, and antioxidant 1010.

[0024] Preferably, the lubricant is a long-chain fatty acid amide lubricant, preferably at least one of oleamide, erucamide, stearamide and N,N-ethylenebisstearamide.

[0025] An anti-fingerprint and scratch-resistant coating composite film is prepared by the preparation method.

[0026] The beneficial effects of the present invention are as follows: The present invention discloses an anti-fingerprint and scratch-resistant coating composite film and a preparation method thereof. The anti-fingerprint coating is applied on the surface of a base film, and then a release film with a surface roughness of 20-40 μm is laminated, and a coating with a hardness of HB-F and a surface roughness of 10-25 μm is formed after curing. The coating on the surface of the coating composite film of the present invention can meet the requirements of anti-fingerprint and scratch resistance, and has excellent crack resistance, and is suitable for being applied to decorative films for coating plates. DETAILED DESCRIPTION

[0027] In the following examples and comparative examples: The brand name of polyurethane acrylate is Allnex Resin EBECRYL 9260; the brand name of organic fluorine-modified polyurethane acrylate is Inoue Chemical UV-9843-9; the brand name of defoamer is BYK 088; the brand name of leveling agent is BYK-UV 3575; and the brand name of wax emulsion is AQUACER 513.

[0028] The technical solution of the present invention is described in detail below through specific embodiments. Example 1

[0029] A method for preparing an anti-fingerprint and scratch-resistant coating composite film, comprising: coating an anti-fingerprint coating on one surface of a PET film by an anilox roller coating method, wherein the coating has a viscosity of 8000±100cps; and then laminating a PP release film with a thickness of 0.06mm and a surface roughness of 20μm on the surface coated with the coating, wherein the laminating pressure is 2kg / cm 2 ; Then, EB irradiation curing is performed under the condition of voltage of 150kV to form a coating (the thickness of the coating is 80μm, the surface roughness is 11.36μm, and the hardness is F), wherein the irradiation dose is 20kGy; The anti-fingerprint coating comprises the following raw materials in parts by weight: 70 parts of polyurethane acrylate, 20 parts of organic fluorine-modified polyurethane acrylate, 10 parts of tripropylene glycol diacrylate, 0.1 parts of defoaming agent, 0.2 parts of leveling agent and 0.5 parts of wax emulsion. Example 2

[0030] A method for preparing an anti-fingerprint and scratch-resistant coating composite film, comprising: coating an anti-fingerprint coating on one surface of a PET film by an anilox roller coating method, wherein the coating has a viscosity of 8000±100cps; and then laminating a PP release film with a thickness of 0.06mm and a surface roughness of 20μm on the surface coated with the coating, wherein the laminating pressure is 4kg / cm 2 ; Then, EB irradiation curing is performed under the condition of voltage of 150kV to form a coating (the thickness of the coating is 80μm, the surface roughness is 19.24μm, and the hardness is F), wherein the irradiation dose is 20kGy; The anti-fingerprint coating material used in Example 2 is the same as that in Example 1. Example 3

[0031] A method for preparing an anti-fingerprint and scratch-resistant coating composite film, comprising: coating an anti-fingerprint coating on one surface of a PET film by an anilox roller coating method, wherein the coating has a viscosity of 7000±100cps; and then laminating a PP release film with a thickness of 0.03mm and a surface roughness of 30μm on the surface coated with the coating, wherein the laminating pressure is 2.6kg / cm 2 ; Then, EB irradiation curing is performed under the condition of voltage of 100kV to form a coating (the thickness of the coating is 50μm, the surface roughness is 24.17μm, and the hardness is F), wherein the irradiation dose is 10kGy; The anti-fingerprint coating comprises the following raw materials in parts by weight: 60 parts of polyurethane acrylate, 30 parts of organic fluorine-modified polyurethane acrylate, 10 parts of tripropylene glycol diacrylate, 0.1 parts of defoaming agent, 0.2 parts of leveling agent and 0.5 parts of wax emulsion. Example 4

[0032] A method for preparing an anti-fingerprint and scratch-resistant coating composite film, comprising: coating an anti-fingerprint coating on one surface of a PET film by an anilox roller coating method, wherein the coating has a viscosity of 9500±100cps; and then laminating a PP release film with a thickness of 0.08mm and a surface roughness of 30μm on the surface coated with the coating, wherein the laminating pressure is 2kg / cm 2 ; UV curing is then performed to form a coating (the coating thickness is 100 μm, the surface roughness is 22.36 μm, and the hardness is HB), and the UV curing irradiation energy is 600 mj / cm 2 ; The anti-fingerprint coating includes the following raw materials in parts by mass: 80 parts of polyurethane acrylate, 15 parts of organic fluorine-modified polyurethane acrylate, 5 parts of tripropylene glycol diacrylate, 0.1 parts of photoinitiator 184, 0.1 parts of defoaming agent, 0.2 parts of leveling agent, and 0.5 parts of wax emulsion.

[0033] Comparative Example 1 A method for preparing an anti-fingerprint and scratch-resistant coating composite film, comprising: coating an anti-fingerprint coating on one surface of a PET film by an anilox roller coating method, wherein the coating has a viscosity of 8000±100cps; and then laminating a PP release film with a thickness of 0.06mm and a surface roughness of 16μm on the surface coated with the coating, wherein the laminating pressure is 1.3kg / cm 2 ; Then, EB irradiation curing is performed under the condition of voltage of 150kV to form a coating (the thickness of the coating is 80μm, the surface roughness is 5.58μm, and the hardness is F), wherein the irradiation dose is 20kGy; The anti-fingerprint coating raw materials used in Comparative Example 1 are the same as those in Example 1.

[0034] Comparative Example 2 A method for preparing a coated composite film, comprising: coating one surface of a PET film with an anti-fingerprint coating by an anilox roller coating method, wherein the coating has a viscosity of 8000±100 cps; and then laminating a PP release film with a thickness of 0.06 mm and a surface roughness of 16 μm on the surface coated with the coating, wherein the laminating pressure is 1.8 kg / cm 2 ; Then, EB irradiation curing is performed under the condition of voltage of 150kV to form a coating (the thickness of the coating is 80μm, the surface roughness is 8.05μm, and the hardness is F), wherein the irradiation dose is 20kGy; The anti-fingerprint coating raw materials used in Comparative Example 2 are the same as those in Example 1.

[0035] Comparative Example 3 A method for preparing a coated composite film, comprising: coating one surface of a PET film with an anti-fingerprint coating by an anilox roller coating method, wherein the coating has a viscosity of 8000±100cps; and then laminating a PP release film with a thickness of 0.06mm and a surface roughness of 45μm on the surface coated with the coating, wherein the laminating pressure is 4.5kg / cm 2 ; Then, EB irradiation curing is performed under the condition of voltage of 150kV to form a coating (the thickness of the coating is 80μm, the surface roughness is 36.46μm, and the hardness is F), wherein the irradiation dose is 20kGy; The anti-fingerprint coating raw materials used in Comparative Example 3 are the same as those in Example 1.

[0036] Comparative Example 4 A method for preparing a coated composite film, comprising: coating one surface of a PET film with an anti-fingerprint coating by an anilox roller coating method, wherein the coating has a viscosity of 8000±100 cps; and then laminating a PP release film with a thickness of 0.06 mm and a surface roughness of 45 μm on the surface coated with the coating, wherein the laminating pressure is 4.8 kg / cm 2 ; Then, EB irradiation curing is performed under the condition of voltage of 150kV to form a coating (the thickness of the coating is 80μm, the surface roughness is 38.84μm, and the hardness is F), wherein the irradiation dose is 20kGy; The anti-fingerprint coating raw materials used in Comparative Example 4 are the same as those in Example 1.

[0037] Comparative Example 5 A method for preparing a coating composite film, comprising: coating a high-hardness scratch-resistant and anti-fingerprint coating on one surface of a PET film by an anilox roller coating method, wherein the coating has a viscosity of 5400±100cps; and then performing EB radiation curing under a voltage of 150kV to form a coating with a thickness of 80μm and a hardness of H, wherein the radiation dose is 20kGy; The high-hardness scratch-resistant and anti-fingerprint coating comprises the following raw materials in parts by mass: 40 parts of polyurethane acrylate, 20 parts of organic fluorine-modified polyurethane acrylate, 40 parts of tripropylene glycol diacrylate, 0.1 parts of defoaming agent, 0.2 parts of leveling agent, and 0.5 parts of wax emulsion.

[0038] In the above embodiments and comparative examples, the coating surface roughness test is based on the rules and methods for evaluating surface structure by the surface structure profile method in the standard GB / T 10610 Product Geometric Technical Specification (GPS); the coating hardness test method is based on the 4.57 paint film hardness determination in the standard GB17657-2013.

[0039] Test example The coatings of Examples 1-2 and Comparative Examples 1-5 were tested for performance, and the testing method was as follows: The water drop angle test is based on the standard GB / T 30693-2014 Measurement of the contact angle between plastic and water; The oil drop angle test is based on the standard GB / T 30693-2014 Measurement of the contact angle between plastic and water, and the reagent used is n-hexadecane reagent; The artificial sweat contact angle test is in accordance with the standard GB / T 30693-2014 Measurement of the contact angle between plastics and water. The artificial sweat formula used is: lactic acid 3ml / L, acetic acid 5ml / L, sodium chloride 10g / L, sodium hydrogen phosphate 10g / L, and the balance is deionized water.

[0040] The scratch resistance test is carried out according to 4.42 Surface scratch resistance performance in GB / T 17657-2022. The test result is qualified if there is no scratch on the surface of the specimen under a load of 2N, otherwise it is unqualified; The bending test refers to the national standard GB / T 6742-2007 "Bending test for paints and varnishes (cylindrical shaft)".

[0041] The test results are shown in Table 1: Table 1

[0042] It can be seen from the data in Table 1 that the present invention, by coating an anti-fingerprint coating with a suitable formula and hardness on the base film, and by laminating a release film with a suitable surface roughness on the surface of the coating and curing it so that the coating has a suitable surface roughness, on the one hand, plays a synergistic enhancement role in the anti-fingerprint effect, the water contact angle can reach more than 95, the n-hexadecane contact angle can reach more than 20, and the artificial sweat contact angle can reach more than 95; on the other hand, due to the low hardness and high flexibility of the coating, it has good crack resistance. Under the same coating formula conditions, the surface roughness of the coatings of Comparative Examples 1 and 2 is low, and the anti-fingerprint effect of the coatings is poor; the surface roughness of the coatings of Comparative Examples 3 and 4 is high, and the scratch resistance effect is poor due to the increased resistance to scratches. Comparative Example 5 uses a conventional high-hardness scratch-resistant anti-fingerprint coating to form a coating. Although it has good anti-fingerprint and scratch resistance effects, its hardness is high, resulting in poor crack resistance. In summary, the coating of the present invention not only has excellent anti-fingerprint and scratch resistance effects, but also has good crack resistance. When bending processing is required, the coating is not prone to cracking or falling off, and is suitable for decorative films for covering panels.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing an anti-fingerprint and scratch-resistant coating composite film, characterized in that: An anti-fingerprint coating is applied on one surface of the base film, and then a release film with a surface roughness of 20-40 μm is laminated on the surface coated with the coating, and a coating with a hardness of HB-F and a surface roughness of 10-25 μm is formed after curing. The anti-fingerprint coating comprises the following raw materials in parts by weight: 20-100 parts of polyurethane acrylate, 20-100 parts of organic fluorine-modified polyurethane acrylate, 0.1-100 parts of diluent, 0.1-5 parts of defoaming agent, 0.1-5 parts of leveling agent and 0.1-2 parts of wax emulsion.

2. The method for preparing the anti-fingerprint and scratch-resistant coating composite film according to claim 1, characterized in that: The viscosity of the anti-fingerprint coating is 5000-10000 cps.

3. The method for preparing the anti-fingerprint and scratch-resistant coating composite film according to claim 1, characterized in that: The thickness of the release film is 0.03-0.08 mm.

4. The method for preparing the anti-fingerprint and scratch-resistant coating composite film according to claim 1, characterized in that: The laminating pressure is 2-4 kg / cm 2 .

5. The method for preparing the anti-fingerprint and scratch-resistant coating composite film according to claim 1, characterized in that: The curing is EB irradiation curing, the voltage of the EB irradiation curing is 100-200 kV, and the irradiation dose is 10-30 kGy.

6. The method for preparing the anti-fingerprint and scratch-resistant coating composite film according to claim 1, characterized in that: The raw materials of the anti-fingerprint coating further include 0.1 to 1 parts by mass of a photoinitiator; when the raw materials of the anti-fingerprint coating include a photoinitiator, the curing is UV curing or EB radiation curing.

7. The method for preparing the anti-fingerprint and scratch-resistant coating composite film according to claim 1, characterized in that: The thickness of the coating is 50-100 μm.

8. The method for preparing the anti-fingerprint and scratch-resistant coating composite film according to claim 1, characterized in that: The base film is a PVC film, a PP film, a PET film or a prepreg paper.

9. An anti-fingerprint and scratch-resistant coating composite film, characterized in that: Prepared by the preparation method according to any one of claims 1 to 8.

Images