Anti-fingerprint structure, preparation method thereof and product applying anti-fingerprint structure

Abstract

The invention provides a preparation method of an anti-fingerprint structure, which comprises the following steps: coating a first coating on the surface of a substrate and curing to form a priming coat, organic-inorganic silicon hybrid resin being dispersed in the first coating; the surface, away from the base body, of the bottom coating is coated with a second coating, the second coating is cured to form the fingerprint-resistant coating, the second coating contains a fluorosilicone compound, and the fluorosilicone compound is chemically bonded with the organic-inorganic silicon hybrid resin in the bottom coating. The method is good in reworkability, the binding force between the film layers is good, and the content of fluoride in the whole anti-fingerprint structure can be reduced. The invention also provides the anti-fingerprint structure prepared by the preparation method of the anti-fingerprint structure and a product applying the anti-fingerprint structure.

Description

Technical Field

[0001] This application relates to the field of surface treatment, and particularly to a method for preparing an anti-fingerprint structure, an anti-fingerprint structure obtained by the method for preparing the anti-fingerprint structure, and a product applying the anti-fingerprint structure. Background Art

[0002] In existing anti-fingerprint products, a relatively high content of fluorides is often used. With the increasing requirements for product environmental protection, how to reduce the fluoride content in the product while ensuring the anti-fingerprint effect is a technical problem that urgently needs to be solved at present. Summary of the Invention

[0003] The first aspect of this application provides a method for preparing an anti-fingerprint structure, including the following steps: coating a first coating on the surface of a substrate and curing to form a bottom coating, wherein an organic-inorganic silicon hybrid resin is dispersed in the first coating; coating a second coating on the surface of the bottom coating facing away from the substrate and curing to form an anti-fingerprint coating, wherein the second coating contains a fluorosilicon compound, and the fluorosilicon compound is chemically bonded to the organic-inorganic silicon hybrid resin in the bottom coating.

[0004] In the above method for preparing the anti-fingerprint structure of this application, by first forming a bottom coating containing an organic-inorganic silicon hybrid resin, the fluorosilicon compound in the subsequent formed anti-fingerprint coating hydrolyzes to form silanol groups when contacting water vapor in the atmosphere, and then can dehydrate and bond with the organic-inorganic silicon hybrid resin in the bottom coating to form a stable structure, thereby improving the bonding force between the anti-fingerprint coating and the bottom coating. In addition, the anti-fingerprint coating is designed independently instead of mixing anti-fingerprint materials in the bottom coating, and the organic-inorganic silicon hybrid resin is dispersed in the bottom coating. After the anti-fingerprint coating fails, it is not necessary to abandon the entire anti-fingerprint structure or remove the entire film layer on the surface of the substrate. It is only necessary to polish and then form the anti-fingerprint coating on the bottom coating again. That is, the above method for preparing the anti-fingerprint structure has good reworkability and high yield, and is beneficial to reducing the fluoride content in the entire anti-fingerprint structure, thereby facilitating the solution of the problem of excessive fluoride in the anti-fingerprint structure. Moreover, the independent design of the anti-fingerprint coating can increase the water contact angle, thereby improving the user experience of the product.

[0005] Based on the first aspect, in some possible implementation manners, the second coating further contains a non-fluorosilicon-based fluorinated solvent, and the non-fluorosilicon-based fluorinated solvent includes at least one of perfluoroethyl butyl ether and nonafluorobutyl methyl ether.

[0006] Based on the first aspect, in some possible implementation manners, in the second coating, by weight, the fluorosilicon compound is 1 part to 10 parts, and the fluorine-containing solvent other than fluorosilicon is 90 parts to 99 parts.

[0007] Based on the first aspect, in some possible implementation manners, the fluorosilicon compound includes a chain structure of -CF2-O-CF2-.

[0008] Based on the first aspect, in some possible implementation manners, by weight, in the first coating, the organic-inorganic silicon hybrid resin is 5 parts to 15 parts, and the first coating further includes 5 parts to 15 parts of a hexa-functional aliphatic polyurethane acrylate, 8 parts to 12 parts of a di-functional aliphatic polyurethane acrylate, 10 parts to 15 parts of a solvent-based acrylate resin, 20 parts to 30 parts of an acrylate monomer, 2 parts to 5 parts of an initiator, 0.3 parts to 1 part of an auxiliary agent, and 15 parts to 25 parts of butyl acetate.

[0009] Based on the first aspect, in some possible implementation manners, by weight, in the first coating, the organic-inorganic silicon hybrid resin is 5 parts to 15 parts, and the first coating further includes 5 parts to 15 parts of a hexa-functional aliphatic polyurethane acrylate, 8 parts to 12 parts of a di-functional aliphatic polyurethane acrylate, 15 parts to 20 parts of a dual-curing aliphatic polyurethane acrylate, 20 parts to 35 parts of an acrylate monomer, 2 parts to 5 parts of an initiator, 0.3 parts to 1 part of an auxiliary agent, and 15 parts to 25 parts of butyl acetate.

[0010] Based on the first aspect, in some possible implementation manners, the thickness of the anti-fingerprint coating is 6 nm to 10 nm.

[0011] Based on the first aspect, in some possible implementation manners, the thickness of the bottom coating is 3 microns to 100 microns.

[0012] The second aspect of the present application provides an anti-fingerprint structure obtained by the preparation method of the anti-fingerprint structure as described above.

[0013] The third aspect of the present application provides a product including the anti-fingerprint structure as described above. Description of the Drawings

[0014] Figure 1 is a flowchart of the preparation method of the anti-fingerprint structure according to an embodiment of the present application.

[0015] Figure 2 is a schematic structural diagram of the anti-fingerprint structure according to an embodiment of the present application.

[0016] Main Element Symbol Description

[0017] Anti-fingerprint structure 100

[0018] Substrate 20

[0019] Bottom coating 30

[0020] Anti-fingerprint coating 40 Detailed implementation manners

[0021] The technical solutions in the embodiments of the present application will be clearly and detailedly described below. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application.

[0022] Hereinafter, the embodiments of the present application will be described in detail. However, the present application can be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this application will be thorough and detailed and convey to those skilled in the art.

[0023] In addition, for the sake of simplicity and clarity, in the drawings, the dimensions or thicknesses of various components and layers may be enlarged. Throughout the text, the same numerals refer to the same elements.

[0024] Furthermore, when describing the embodiments of the present application, "may" means "one or more embodiments of the present application".

[0025] Please refer to Figure 1 , a method for preparing an anti-fingerprint structure according to an embodiment of the present application, which includes the following steps:

[0026] Step S1, applying a first coating on the surface of the substrate and curing to form a bottom coating, wherein the first coating is dispersed with an organic-inorganic silicon hybrid resin. Wherein, the silicon in the organic-inorganic silicon hybrid resin is liable to hydrolyze to form silicon hydroxyl groups when contacting with water vapor in the atmosphere.

[0027] In some embodiments, the organic-inorganic silicon hybrid resin may include, but is not limited to, surface-modified nano-SiO2 particles.

[0028] In some embodiments, the first coating may further include 5 to 15 parts of a hexafunctional aliphatic polyurethane acrylate, 8 to 12 parts of a difunctional aliphatic polyurethane acrylate, 10 to 15 parts of a solvent-based acrylic resin, 20 to 30 parts of an acrylate monomer, 2 to 5 parts of an initiator, 0.3 to 1 part of an additive, and 15 to 25 parts of butyl acetate. Among them, the organic-inorganic silicon hybrid resin may be 5 to 15 parts.

[0029] In some embodiments, the first coating may further include 5 to 15 parts of a hexafunctional aliphatic polyurethane acrylate, 8 to 12 parts of a difunctional aliphatic polyurethane acrylate, 15 to 20 parts of a dual-curing aliphatic polyurethane acrylate, 20 to 35 parts of an acrylate monomer, 2 to 5 parts of an initiator, 0.3 to 1 part of an additive, and 15 to 25 parts of butyl acetate. Among them, the organic-inorganic silicon hybrid resin may be 5 to 15 parts.

[0030] In the above first coating, the hexafunctional aliphatic polyurethane acrylate can provide hardness and wear resistance for the primer coating; the difunctional aliphatic polyurethane acrylate can provide covering power and flexibility for the primer coating; the solvent-based acrylic resin is beneficial to improving the adhesion between the primer coating and the substrate and is beneficial to improving the leveling and wetting effect of the first coating, thereby being beneficial to improving the smoothness of the primer coating; the acrylate monomer is beneficial to promoting the leveling of the first coating and can adjust the hardness and flexibility of the primer coating; the organic-inorganic silicon hybrid resin is beneficial to improving the surface hardness of the primer coating; and the initiator is beneficial to promoting the curing of the first coating. The dual-curing aliphatic polyurethane acrylate can promote the drying of the first coating when it is not convenient to perform photocuring on the first coating.

[0031] In some embodiments, the thickness of the primer coating can be, but is not limited to, 3 to 100 microns.

[0032] The substrate may include at least one of a metal and a plastic part.

[0033] The additive may include, but is not limited to, at least one of a leveling agent, an antifoaming agent, etc.

[0034] Step S2, applying a second coating on the surface of the primer coating facing away from the substrate and curing to form an anti-fingerprint coating, wherein the second coating contains a fluorosilicon compound, and the fluorosilicon compound is chemically bonded to the organic-inorganic silicon hybrid resin in the primer coating.

[0035] In some embodiments, the second coating may further comprise a fluorinated solvent other than fluorosilicone, and the fluorinated solvent other than fluorosilicone may include, but is not limited to, at least one of perfluoroethyl butyl ether, perfluorobutyl methyl ether, perfluorobutyl ethyl ether, perfluorohexyl methyl ether, hydrofluoroether, and nonafluorobutyl methyl ether, which is used to dilute the fluorosilicone compound. Since the amount of the fluorosilicone compound required for bonding with the primer layer to form the fingerprint-resistant coating is extremely small, diluting the fluorosilicone compound with the fluorinated solvent other than fluorosilicone can reduce the amount of waste of the fluorosilicone compound. The fluorinated solvent other than fluorosilicone volatilizes during the process of forming the fingerprint-resistant coating corresponding to the second coating.

[0036] In some embodiments, the second coating may be composed of the fluorosilicone compound and the fluorinated solvent other than fluorosilicone.

[0037] In some embodiments, in the second coating, by weight, the fluorosilicone compound may be 0.1 part to 10 parts, and the fluorinated solvent other than fluorosilicone may be 90 parts to 99.9 parts.

[0038] In some embodiments, the fluorosilicone compound may be a perfluoropolyether-modified fluorosilane compound, which includes a perfluoropolyether modification group and a silicon-oxygen bond, and the perfluoropolyether modification group is bonded to the silicon atom in the silicon-oxygen bond. When forming the fingerprint-resistant coating, the silicon-oxygen bond (such as the siloxy group located at the end of the fluorosilicone compound, taking -Si(OCH3)3 as an example) hydrolyzes to form silanol groups, and then can undergo dehydration bonding with the silanol groups of the organic-inorganic silicon hybrid resin in the primer layer to form a stable structure, so that the perfluoropolyether modification group is firmly bonded to the surface of the primer layer to achieve the purpose of fingerprint resistance.

[0039] In some embodiments, the perfluoropolyether modification group may include -(OC4F8) p - group, -(OC3F6) q - group, -(OC2F4) r - group, and -(OCF2) s - group, where the sum of p, q, r, and s is not less than 1, and the number and connection order of the (OC4F8) p - group, -(OC3F6) q - group, -(OC2F4) r - group, and -(OCF2) s - group are arbitrary.

[0040] In some embodiments, the fluorosilicon compound may be an anti-fingerprint AF perfluoropolyether fluorosilane main agent such as UD509 produced by Daikin Japan, KY-197 produced by Shin-Etsu, AGC2020 produced by Asahi Glass, and the F series produced by Dongxing. In some embodiments, the thickness of the anti-fingerprint coating may be 6 nm to 10 nm.

[0041] The water contact angle of the anti-fingerprint coating can reach 110° or more.

[0042] The preparation method of the above anti-fingerprint structure is to first form a bottom coating containing an organic-inorganic silicon hybrid resin, so that the fluorosilicon compound in the subsequent anti-fingerprint coating hydrolyzes to form silanol groups when contacting water vapor in the atmosphere, and then can dehydrate and bond with the organic-inorganic silicon hybrid resin in the bottom coating to form a stable structure, thereby enhancing the bonding force between the anti-fingerprint coating and the bottom coating. In addition, the anti-fingerprint coating is designed independently instead of mixing anti-fingerprint materials in the bottom coating, and the organic-inorganic silicon hybrid resin is dispersed in the bottom coating. After the anti-fingerprint coating fails or defects occur in the anti-fingerprint structure during production or use, it is not necessary to abandon the entire anti-fingerprint structure or remove the entire film layer on the substrate surface. It is only necessary to polish and then form the anti-fingerprint coating on the bottom coating again. That is, the preparation method of the above anti-fingerprint structure has good reworkability, high yield, and is beneficial to reducing the content of fluorides in the entire anti-fingerprint structure, thus facilitating the solution of the problem of excessive fluorides in the anti-fingerprint structure. Furthermore, the independent design of the anti-fingerprint coating can increase the water contact angle, thereby enhancing the user experience of the product.

[0043] Please refer to Figure 2 In one embodiment of the present application, an anti-fingerprint structure 100 prepared by the above preparation method of the anti-fingerprint structure is further provided. The anti-fingerprint structure 100 includes the substrate 20, the bottom coating 30, and the anti-fingerprint coating 40 stacked in sequence. When the anti-fingerprint effect of the anti-fingerprint coating 40 in the anti-fingerprint structure 100 is reduced or even lost, the original anti-fingerprint coating can be removed to expose the bottom coating 30 and then the anti-fingerprint coating can be re-coated to ensure the anti-fingerprint effect of the anti-fingerprint structure 100 and extend the service life of the anti-fingerprint structure 100.

[0044] One embodiment of the present application further provides a product (not shown in the figure) using the above anti-fingerprint structure 100. The product may be, but is not limited to, vehicle decorative parts, computers, mobile phones, etc.

[0045] The present application will be further described below through specific examples.

[0046] Example 1

[0047] By weight, 25 parts of trimethylolpropane triacrylate (TMPTA) as an acrylate monomer, 5 parts of dipropylene glycol diacrylate (TPGDA) as an acrylate monomer, 12 parts of a hexa-functional aliphatic polyurethane acrylate (brand: Changxing, model: ETERCURE 6145-100), 9 parts of a di-functional aliphatic polyurethane acrylate (brand: Changxing, model: ETERCURE 6112-100), 5 parts of an organic-inorganic silicon hybrid resin (brand: Changxing, model: 601X-35), 9.6 parts of a solvent-based acrylate resin (brand: Jieshida, model: UV-779), 0.4 part of a leveling agent (brand: BYK of Germany, model: BYK333), 2.4 parts of photoinitiator 184 (brand: BASF), 0.2 part of photoinitiator TPO (brand: BASF), 1 part of photoinitiator MBZ (brand: BASF), and 20 parts of butyl acetate were stirred at a speed of 40 revolutions per minute for 5 minutes to be uniformly mixed to obtain a first coating.

[0048] By weight, 0.3 part of a fluorosilicon compound (brand: Daikin of Japan, model: UD509) and 99.7 parts of a perfluoroethyl butyl ether solvent (brand: 3M, model: 7100) were stirred at a speed of 40 revolutions per minute for 5 minutes to be uniformly mixed to obtain a second coating.

[0049] The above first coating was sprayed on the surface of a composite injection-molded part of PC (polycarbonate) and ABS (acrylonitrile-butadiene-styrene copolymer) and cured by ultraviolet light irradiation at a standard of 600-900 mj / cm² to form a bottom coating with a thickness of 25 microns. The above second coating was sprayed on the surface of the bottom coating and left standing at 80°C for 2 hours, and after the solvent evaporated, it was cured to form an anti-fingerprint coating with a thickness of 6 nm to 10 nm, thereby obtaining an anti-fingerprint structure.

[0050] Example 2

[0051] By weight, 35 parts of trimethylolpropane triacrylate (TMPTA) as an acrylate monomer, 5 parts of a hexa-functional aliphatic polyurethane acrylate (brand: Changxing, model: ETERCURE 6145-100), 10 parts of a di-functional aliphatic polyurethane acrylate (brand: Changxing, model: ETERCURE 6112-100), 5 parts of an organic-inorganic silicon hybrid resin (brand: Changxing, model: 601X-35), 20 parts of a dual-curing aliphatic polyurethane acrylate (brand: Allenx Zahn, model: EBECRYL 8210), 0.4 part of a leveling agent (brand: BYK of Germany, model: BYK333), 2.5 parts of photoinitiator 184 (brand: BASF), 0.5 part of photoinitiator TPO (brand: BASF), 1 part of photoinitiator MBZ (brand: BASF), and 18 parts of butyl acetate were stirred at a speed of 40 revolutions per minute for 5 minutes to be uniformly mixed to obtain a first coating.

[0052] By weight, 0.3 part of a fluorosilicon compound (brand: Daikin of Japan, model: UD509) and 99.7 parts of a perfluoroethyl butyl ether solvent (brand: 3M, model: 7100) were stirred at a speed of 40 revolutions per minute for 5 minutes to be uniformly mixed to obtain a second coating.

[0053] The above first coating was sprayed on the surface of a PC injection-molded part and baked at 60 °C for 5 minutes, and then cured by ultraviolet light irradiation at a standard of 600-900 mj / cm² to form a bottom coating with a thickness of 25 microns. The above second coating was sprayed on the surface of the bottom coating and left standing at 80 °C for 2 hours, and after the solvent evaporated, it was cured to form an anti-fingerprint coating with a thickness of 6 nm to 10 nm, thereby obtaining an anti-fingerprint structure.

[0054] The anti-fingerprint structures in Examples 1-2 were respectively subjected to adhesion test, abrasion resistance test, weather resistance test, chemical resistance test, and the initial water contact angle of the anti-fingerprint coating was measured, and the values of 4 adjacent positions or the average value of the values of 4 adjacent positions were taken. The specific test results are recorded in Table 1 below.

[0055] Specific method for water contact angle test: The test was carried out according to the method of GB / T 30693-2014.

[0056] Specific method for adhesion test: The test was carried out according to the method of GB / T9286, and it was judged whether the adhesion met the requirements according to whether the subsequent measured water contact angle was greater than 110°.

[0057] Specific method for abrasion resistance test: An ultra-fine dust-free cloth (3 layers stacked) was used with a load of 500 g, a speed of 40 times per minute, a stroke of 40 mm, and friction for 1000 times, and then the water contact angle was tested. It was judged whether the abrasion resistance performance met the requirements by whether the water contact angle was greater than 95°.

[0058] Specific method for weather resistance test: The test is carried out according to the method of Q / BYDQ-A1901.402. After 85 cycles, whether the water contact angle is greater than 95° is tested to judge whether the weather resistance performance meets the requirements.

[0059] Table 1

[0060]

[0061] It should be noted that the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art in the technical field disclosed by the present application can easily think of changes or substitutions, which should be covered within the protection scope of the present application; without conflict, the implementation manners of the present application and the features in the implementation manners can be combined with each other. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A preparation method of an anti-fingerprint structure, characterized in that, It includes the following steps: Coat a first coating on the surface of the substrate and cure it to form a primer coat, wherein an organic-inorganic silicon hybrid resin is dispersed in the first coating; Coat a second coating on the surface of the primer coat facing away from the substrate and cure it to form an anti-fingerprint coating, wherein a fluorosilicon compound is included in the second coating, and the fluorosilicon compound is chemically bonded to the organic-inorganic silicon hybrid resin in the primer coat.

2. The preparation method of the fingerprint-resistant structure according to claim 1, wherein, The second coating further includes a non-fluorosilicon fluorinated solvent, and the non-fluorosilicon fluorinated solvent includes at least one of perfluoroethyl butyl ether, perfluorobutyl methyl ether, perfluorobutyl ethyl ether, perfluorohexyl methyl ether, hydrofluoroether, and nonafluorobutyl methyl ether.

3. The preparation method of the anti-fingerprint structure according to claim 2, characterized in that, In the second coating, by weight, the fluorosilicon compound is 0.1 part to 10 parts, and the non-fluorosilicon solvent is 90 parts to 99.9 parts.

4. The preparation method of the fingerprint-resistant structure according to claim 1, characterized in that, The fluorosilicon compound is a perfluoropolyether-modified fluorosilane compound.

5. The preparation method of the anti-fingerprint structure according to any one of claims 1 to 4, characterized in that, By weight, in the first coating, the organic-inorganic silicon hybrid resin is 5 parts to 15 parts, and the first coating further includes 5 parts to 15 parts of a hexa-functional aliphatic polyurethane acrylate, 8 parts to 12 parts of a di-functional aliphatic polyurethane acrylate, 10 parts to 15 parts of a solvent-based acrylate resin, 20 parts to 30 parts of an acrylate monomer, 2 parts to 5 parts of an initiator, 0.3 part to 1 part of an auxiliary agent, and 15 parts to 25 parts of butyl acetate.

6. The preparation method of the anti-fingerprint structure according to any one of claims 1 to 4, characterized in that, By weight, in the first coating, the organic-inorganic silicon hybrid resin is 5 parts to 15 parts, and the first coating further includes 5 parts to 15 parts of a hexa-functional aliphatic polyurethane acrylate, 8 parts to 12 parts of a di-functional aliphatic polyurethane acrylate, 15 parts to 20 parts of a dual-curing aliphatic polyurethane acrylate, 20 parts to 35 parts of an acrylate monomer, 2 parts to 5 parts of an initiator, 0.3 part to 1 part of an auxiliary agent, and 15 parts to 25 parts of butyl acetate.

7. The preparation method of the anti-fingerprint structure according to claim 1, characterized in that, The thickness of the anti-fingerprint coating is 6 nm to 10 nm.

8. The preparation method of the anti-fingerprint structure according to claim 1, wherein, The thickness of the primer coat is 3 microns to 100 microns.

9. An anti-fingerprint structure, characterized in that, It is obtained by the preparation method of the anti-fingerprint structure according to any one of claims 1 to 8.

10. A product, characterized in that, It includes the anti-fingerprint structure according to claim 9.

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