Surface treatment method for improving adhesion capacity of Anti-fingerprint film

Abstract

A surface treatment method for improving the adhesion capacity of an anti-fingerprint film. Surface hydroxylation is achieved by treating the surface of glass or SiO2 with plasma, and the high-strength adhesion and high-adsorption-capacity bonding of a PFPE-type anti-fingerprint film are achieved by utilizing silane coupling chemical linkage between surface hydroxyl and the anti-fingerprint film, thereby improving the adhesion force between the anti-fingerprint film and the surface. Experiments show that by means of such a new plasma treatment method, the wettability of the surface of glass and SiO2 by water can be greatly improved, and the treated surface can achieve good hydroxylation, thereby greatly reducing the contact angle between same and water; the contact angle is relatively large after the anti-fingerprint film is coated, thereby effectively improving the hydrophobicity and friction resistance of the anti-fingerprint film; and the plasma treatment process is simple, energy-saving, environmentally friendly, pollution-free and highly efficient, and takes a short period of time, thus providing an important approach for achieving large-scale treatment and improvement of the friction resistance of the anti-fingerprint film.

Description

A surface treatment method for improving the adhesion ability of anti-fingerprint film Technical Field

[0001] The present invention relates to the field of materials, and in particular to a surface treatment method for improving the adhesion ability of an anti-fingerprint film. Background Art

[0002] AF anti-fingerprint coating is a self-cleaning, anti-fouling nanocoating based on the multiple nano- and micron-scale ultrastructures found on lotus leaves. It offers broad application prospects because it effectively addresses the problem of fingerprint residue on mobile phone back panels made of materials like glass and ceramic. Compared to hydrocarbons, PFPE (perfluoropolyether) molecules have fluorine atoms replacing hydrogen atoms, replacing C-H bonds with stronger C-F bonds. Furthermore, due to the presence of strong C-O and C-C covalent bonds, as well as the neutral nature of the PFPE molecule, PFPE exhibits high thermal and oxidative stability, as well as excellent chemical inertness and insulating properties. In addition, it also has low volatility, a wide liquid temperature range and excellent viscosity-temperature, detection stability, biological inertness, low surface energy, good lubricity and compatibility with plastics, metals and artificial rubber, etc., so it is a relatively good material for anti-fingerprint film. The latest material of this kind is through further connection of silane. Perfluoropolyether silane has good hydrophobicity and is well used in anti-fingerprint film. In order to further improve its anti-friction property, the current research is to link silane on the fluorine-containing chain, which can better realize the connection between silane and the glass / silicon dioxide surface of silica to improve its anti-friction property.

[0003] In order to further form a better chemical link between silane and the surface, the main reactive group of fluoride is currently a condensation reaction with the naturally formed hydroxyl groups (Si-OH) on the surface of deposited glass (the main component is SiO2). Now it can achieve better hydrophobicity, but as current research has found, after thousands of times of friction, the contact angle still decreases. Experiments have also found that after friction, the silane partially falls off. In order to further promote the link, it is considered to use a new surface treatment method to achieve surface controllable hydroxyl groups, promote the link between the material and the surface, and improve its anti-friction properties. Technical issues

[0004] In view of the shortcomings of the existing technology, the present invention provides a method for improving the friction properties of anti-fingerprint films through plasma treatment. This method can achieve a contact angle of less than 1° on the sample surface before coating with the anti-fingerprint film, and a contact angle of 121° on the sample surface after coating with the anti-fingerprint film, while also achieving an improvement in the friction properties of the anti-fingerprint film. Technical Solutions

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] A surface treatment method for improving the adhesion ability of an anti-fingerprint film comprises the following steps:

[0007] (1) Using a heated water vapor outlet device to prepare water vapor, and using temperature to control the saturated vapor pressure of the water vapor to achieve control of the water vapor flow rate; one end of the outlet device is connected to the heated water vapor outlet device, and the other end is connected to the plasma generator;

[0008] (2) placing the preliminarily cleaned sample in the plasma generator, mixing the gas generated by the gas outlet device and the water vapor generated by the heated water vapor outlet device after pretreatment and introducing the mixture into the plasma generator to generate plasma, thereby modifying the sample surface, thereby obtaining a surface hydroxylated sample;

[0009] (3) Spraying anti-fingerprint oil on the surface of the hydroxylated sample and drying and cooling it.

[0010] Preferably, in step (1), the device for heating the water vapor is specifically: a heating device is installed at the bottom of the water vapor generating device.

[0011] Preferably, in step (2), the modification treatment time is 4 to 15 minutes.

[0012] Preferably, in step (2), the modification treatment power is 100 to 300W.

[0013] Preferably, in step (2), the gas is selected from any one of argon, oxygen, nitrogen, and an oxygen / argon mixture.

[0014] Preferably, in step (2), the pressure ratio of gas to water vapor is 8:2 to 0:10.

[0015] Preferably, in step (2), the flow rate of the plasma is 2 to 6 cc / min.

[0016] Preferably, in step (2), the sample is selected from any one of ordinary soda-lime glass, SiO2 sheet, and SiO2-coated glass.

[0017] Preferably, in step (3), the anti-fingerprint oil is a PFPE-based AF anti-fingerprint coating material, the drying temperature is above 150°C, the drying time is above 30 minutes, and the cooling time is above 2 hours. Beneficial effects

[0018] The beneficial effects of the present invention are:

[0019] (1) The present invention generates a variety of mixed plasmas by mixing multiple gases with water vapor (the heated water vapor outlet device controls the water vapor flow rate by controlling the temperature, and the gas outlet device controls the gas flow rate by a flow meter) and introducing the mixed plasmas into a plasma generator. The mixed ratio of gases such as argon, oxygen, nitrogen, and oxygen / argon mixed gas with water vapor is controlled to control the ratio of argon, oxygen, nitrogen, H, and OH plasma produced. The plasma mixture with the best surface treatment effect is obtained by optimizing the mixed gas ratio, and the sample surface is treated so that the treated surface achieves the best hydroxylation and greatly reduces the contact angle. Then, an anti-fingerprint film is plated to form a larger contact angle, effectively improving the hydrophobicity and anti-friction properties of the anti-fingerprint film.

[0020] (2) Without affecting the bulk structure and crystal phase of the sample, the sample surface is endowed with new properties, allowing the surface to have controllable hydroxyl groups for contact with anti-fingerprint oil, making the contact stronger and the AF film surface more wear-resistant. The process is simple to operate, low-cost, environmentally friendly, and has a wide range of applications, making it easy to achieve industrial continuous production. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the invention, in which:

[0022] Figure 1 shows the static water contact angle test of untreated glass;

[0023] FIG2 is a static water contact angle test of the sample prepared in Example 1;

[0024] FIG3 is a static water contact angle test of the sample prepared in Example 8;

[0025] FIG4 is a connection diagram of the device of the present invention. Modes for Carrying Out the Invention

[0026] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0027] Example 1

[0028] A method for preparing a surface hydroxylated material by plasma treatment, comprising the following steps:

[0029] Ordinary glass (primarily composed of SiO2) was surface cleaned by ultrasonically cleaning with deionized water for 10 minutes three times, then ultrasonically cleaning with anhydrous ethanol for 10 minutes twice, ultrasonically cleaning with acetone for 10 minutes twice, and ultrasonically cleaning with deionized water for 10 minutes twice to remove any residual acetone on the surface. The sample was then soaked in anhydrous ethanol, removed, and blown dry to remove surface moisture. A water vapor generator was filled with an appropriate amount of water and placed on a heating device. The water was heated to 60°C to 120°C, one end was plugged, and the other end was connected to a gas outlet. Argon / oxygen was passed through the device for 3-5 minutes to remove any residual air. The glass sample was placed in a plasma generator, and the other end of the gas outlet was connected to the plasma generator. The plasma generator was set to a cleaning time of 8 minutes, a processing power of 200W, a pressure ratio of 7:3 between the oxygen / argon mixture and the water vapor, and a plasma flow rate of 2-4cc / min.

[0030] Example 2

[0031] The difference between Example 2 and Example 1 is that the sample selected is SiO2, and the remaining steps are consistent with Example 1.

[0032] Example 3

[0033] The difference between Example 3 and Example 1 is that the plasma cleaning time is set to 9 minutes, and the other steps are consistent with Example 1.

[0034] Example 4

[0035] The difference between Example 4 and Example 2 is that the plasma cleaning time is set to 9 minutes, and the other steps are consistent with Example 2.

[0036] Example 5

[0037] In this Example 5, the sample prepared according to the method of Example 1 was sprayed with Japan Shin-Etsu KY-1905 anti-fingerprint oil and baked at 150°C for 30 minutes.

[0038] Example 6

[0039] In this Example 6, the sample prepared according to the method of Example 2 was sprayed with Japan Shin-Etsu KY-1905 anti-fingerprint oil and baked at 150°C for 30 minutes.

[0040] The contact angle of the sample before being treated in this embodiment decreased by several tens of degrees after 3000 frictions, while the contact angle of the sample after being treated in this embodiment decreased by only 3° to 5° after 3000 frictions.

[0041] Example 7

[0042] In this Example 7, the sample prepared according to the method of Example 3 was sprayed with Japan Shin-Etsu KY-1905 anti-fingerprint oil and baked at 150°C for 30 minutes.

[0043] Example 8

[0044] In this embodiment, the sample prepared according to the method of Example 4 was sprayed with Japan Shin-Etsu KY-1905 anti-fingerprint oil and baked at 150°C for 30 minutes.

[0045] Contact angle tests were performed on the samples obtained in Examples 1 to 8 to obtain their contact angle values.

[0046] Table 1 Contact angle values ​​of samples obtained in various examples

[0047] Sample contact angle (°) Example 1 0.53 Example 2 4.08 Example 3 4.45 Example 4 1.73 Example 5 1 15 Example 6 1 19.4 Example 7 1 15.8 Example 8 1 20.1

[0048] Since the linking of silane to the glass / silica surface is achieved by linking silane to the fluorine-containing chain, wherein the linking is achieved through the hydroxyl group, it can be seen from Table 1 and Figures 1 to 3 that the contact angle of the glass / silica surface is larger through measurement, indicating that the improved plasma cleaning method used in this experiment can increase the degree of hydroxylation of the sample surface, making the sample surface more hydrophilic, and improving the contact between the sample and the macromolecules on the surface of the AF film, thereby making the macromolecules of the AF film less likely to fall off and having better anti-friction performance.

[0049] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the claims.

[0050] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A surface treatment method for improving the adhesion ability of an anti-fingerprint film, characterized in that: The following steps are involved: (1) using a heated water vapor outlet device to prepare water vapor, and using temperature to control the saturated vapor pressure of the water vapor to achieve control of the water vapor flow rate; one end of the gas outlet device is connected to the heated water vapor outlet device, and the other end is connected to the plasma generating device; (2) placing the preliminarily cleaned sample in the plasma generator, mixing the gas generated by the gas outlet device and the water vapor generated by the heated water vapor outlet device after pretreatment and passing them into the plasma generator to generate plasma, so as to modify the surface of the sample, that is, to obtain a surface hydroxylated sample; (3) Spraying anti-fingerprint oil on the surface of the hydroxylated sample and drying and cooling the sample.

2. A surface treatment method for improving the adhesion ability of an anti-fingerprint film according to claim 1, characterized in that: In step (1), the device for heating and producing water vapor is specifically: a heating device is installed at the bottom of the water vapor generating device.

3. A surface treatment method for improving the adhesion ability of an anti-fingerprint film according to claim 1, characterized in that: In step (2), the modification treatment time is 4 to 15 minutes.

4. The surface treatment method for improving the adhesion ability of anti-fingerprint film by plasma treatment according to claim 1, characterized in that: In step (2), the modification treatment power is 100 to 300 W.

5. A surface treatment method for improving the adhesion ability of an anti-fingerprint film according to claim 1, characterized in that: In step (2), the gas is selected from any one of argon, oxygen, nitrogen, and an oxygen / argon mixture.

6. A surface treatment method for improving the adhesion ability of an anti-fingerprint film according to claim 1, characterized in that: In step (2), the gas pressure ratio of the gas to the water vapor is 8:2-0:

10.

7. A surface treatment method for improving the adhesion ability of an anti-fingerprint film according to claim 1, characterized in that: In step (2), the flow rate of the plasma is 2 to 6 cc / min.

8. A surface treatment method for improving the adhesion ability of an anti-fingerprint film according to claim 1, characterized in that: In step (2), the sample is selected from any one of ordinary soda-lime glass, SiO2 sheet, and SiO2-coated glass.

9. A surface treatment method for improving the adhesion ability of an anti-fingerprint film according to claim 1, characterized in that: In step (3), the anti-fingerprint oil is a PFPE-based AF anti-fingerprint coating material, the drying temperature is above 150°C, the drying time is above 30min, and the cooling time is above 2h.

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