High cof anti-fingerprint coating material and method of making and coating

Abstract

The application discloses a high-COF anti-fingerprint coating material which is prepared from the following components by weight percentage: 0.1-2% of an anti-fingerprint main agent, 0.01-0.5% of an organic polysilazane, 0.01-1% of a fluorosilane coupling agent, and the balance of a mixed solvent. The application can adjust the ratio among the anti-fingerprint main agent, the organic polysilazane and the fluorosilane coupling agent to improve the COF value of the coating and achieve the purpose of adjustable COF value, so as to meet different application scenarios. After film coating, the application can form a chemical bond with a base material, and the film layer has excellent wear resistance and easy cleanability.

Description

Technical Field

[0001] This invention relates to the field of surface treatment coating materials, specifically to a high COF anti-fingerprint coating material, a method for preparing the coating material, and the coating itself. Background Technology

[0002] AF (anti-fingerprint) coatings are widely used in touch-screen applications such as mobile phones, tablets, e-books, digital signage, medical and industrial control systems, educational all-in-one machines, and automotive displays due to their excellent hydrophobic, oleophobic, high wear resistance, easy cleaning, and smooth texture.

[0003] The coefficient of friction (COF) is an important indicator for evaluating the slipperiness of an anti-slip (AF) film. In touch applications, a lower COF value is generally preferred for a better user experience. Currently, the COF values ​​of AF products from different brands on the market vary slightly, generally ranging from 0.02 to 0.05. However, in some special applications, a higher COF value is required for the AF film, such as mobile phone back covers and laptop casings. Excessive slipperiness can easily cause products to slip and increase the risk of drops. Therefore, a COF value greater than 0.05 is required, while simultaneously demanding good hydrophobicity, oleophobicity, abrasion resistance, and fingerprint resistance. Although anti-fingerprint products are relatively mature, there is currently no AF product that satisfies both abrasion resistance and a high COF value. Summary of the Invention

[0004] One of the objectives of this invention is to address the shortcomings of existing technologies by providing a high-COF anti-fingerprint coating material that is both wear-resistant and has a high COF value.

[0005] Another objective of this invention is to address the shortcomings of existing technologies by providing a method for preparing a high-COF anti-fingerprint coating material that is both wear-resistant and has a high COF value.

[0006] Another objective of this invention is to address the shortcomings of existing technologies by providing a high COF anti-fingerprint coating that is both wear-resistant and has a high COF value.

[0007] The objective of this invention can be achieved by designing a high COF anti-fingerprint coating material, which is made of the following components in weight percentage: 0.1-2% anti-fingerprint agent, 0.01-0.5% organopolysilazane, 0.01-1% fluorosilane coupling agent, and the balance being a mixed solvent.

[0008] Furthermore, the anti-fingerprint agent is a perfluoropolyether siloxane-based anti-fingerprint treatment agent.

[0009] Furthermore, the molecular weight of the organic polynitrosilane is 500 to 10,000.

[0010] Furthermore, the fluorosilane coupling agent is one or more of the following: trifluoropropanetrimethoxysilane, trifluoropropyltriethoxysilane, nonafluorohexyltrimethoxysilane, nonafluorohexyltriethoxysilane, perfluorooctyltrimethoxysilane, perfluorooctyltriethoxysilane, perfluorodecyltrimethoxysilane, and perfluorodecyltriethoxysilane.

[0011] Furthermore, the mixed solvent is a volatile siloxane:fluorinated organic solvent in a ratio of 10:90 to 90:10.

[0012] Furthermore, the ratio of volatile siloxanes to fluorinated organic solvents is 50:50.

[0013] Furthermore, the volatile siloxane is one or more of hexamethyldisiloxane, hexamethylcyclotrisiloxane, octamethyltrisiloxane, octamethylcyclotetrasiloxane, decamethyltetrasiloxane, decamethylcyclopentasiloxane, dodecylpentasiloxane, and dodecylcyclohexasilane; the fluorinated organic solvent is one or more of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, methyl nonafluorobutyl ether, methyl nonafluoroisobutyl ether, ethyl nonafluorobutyl ether, ethyl nonafluoroisobutyl ether, 2-methoxy-3-trifluoromethyloctafluorobutane, perfluoro-3,5-dioxane-hexylmethyl ether, perfluorocyclic ether, and hexafluoropropylene trimer.

[0014] Another objective of this invention can be achieved by designing a method for preparing a high COF anti-fingerprint coating material, comprising the following steps:

[0015] S1: Prepare the anti-fingerprint agent, organopolynitrosilane, and fluorosilane coupling agent according to the mass percentages mentioned above;

[0016] S2: Prepare the mixed solvent according to the mass ratio described above, and stir evenly after mixing;

[0017] S3: Add the anti-fingerprint agent, organic polynitrosilane, and fluorosilane coupling agent to the mixed solvent and stir until homogeneous.

[0018] Another objective of the present invention can be achieved by designing a high COF anti-fingerprint coating, wherein the coating material prepared by the above preparation method is prepared by a coating process to obtain a high COF anti-fingerprint coating, wherein the COF value of the coating is in the range of 0.05 to 0.2, preferably >0.1.

[0019] This invention improves the COF value of the coating and achieves adjustable COF value by adjusting the ratio of the anti-fingerprint agent, organopolysilazane, and fluorosilane coupling agent, thus meeting the needs of different application scenarios. After coating, the film can form chemical bonds with the substrate, and the film layer has excellent wear resistance and easy cleaning. Detailed Implementation

[0020] The present invention will be further described below with reference to embodiments. It should be understood that the embodiments described in this specification are merely for explaining the present invention and are not intended to limit the present invention. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the protection scope of the present invention.

[0021] A high COF anti-fingerprint coating material is made from the following components in weight percentage: 0.1-2% anti-fingerprint agent, 0.01-0.5% organopolysilazane, 0.01-1% fluorosilane coupling agent, and the balance being a mixed solvent.

[0022] The anti-fingerprint agent is a commercially available perfluoropolyether siloxane-based anti-fingerprint treatment agent, such as Daikin UD509, UD120, Shin-Etsu KY-197, Yicheng A510, A530 series, etc.

[0023] The organopolynitrosilane has a molecular weight of 500–10000. Preferably, the molecular weight is 500–2800, which can effectively improve the COF value.

[0024] The fluorosilane coupling agent is one or more of the following: trifluoropropanetrimethoxysilane, trifluoropropyltriethoxysilane, nonafluorohexyltrimethoxysilane, nonafluorohexyltriethoxysilane, perfluorooctyltrimethoxysilane, perfluorooctyltriethoxysilane, perfluorodecyltrimethoxysilane, and perfluorodecyltriethoxysilane.

[0025] The mixed solvent is a volatile siloxane: fluorinated organic solvent in a ratio of 10:90 to 90:10, preferably 50:50.

[0026] The volatile siloxane is one or more of hexamethyldisiloxane, hexamethylcyclotrisiloxane, octamethyltrisiloxane, octamethylcyclotetrasiloxane, decamethyltetrasiloxane, decamethylcyclopentasiloxane, dodecylpentasiloxane, and dodecylcyclohexasilane.

[0027] The fluorinated organic solvent is one or more of the following: 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, methyl nonafluorobutyl ether, methyl nonafluoroisobutyl ether, ethyl nonafluorobutyl ether, ethyl nonafluoroisobutyl ether, 2-methoxy-3-trifluoromethyl octafluorobutane, perfluoro-3,5-dioxane methyl ether, perfluorocyclic ether, and hexafluoropropylene trimer.

[0028] A method for preparing a high COF anti-fingerprint coating material includes the following steps:

[0029] S1: Prepare the anti-fingerprint agent, organopolynitrosilane, and fluorosilane coupling agent according to the mass percentages mentioned above;

[0030] S2: Prepare the mixed solvent according to the mass ratio described above, and stir evenly after mixing;

[0031] S3: Add the anti-fingerprint agent, organopolynitrosilane, and fluorosilane coupling agent to the mixed solvent, stir evenly, stir at room temperature, stir at a speed of 300-1000 rpm, and stir for 2-5 minutes.

[0032] A high COF anti-fingerprint coating is prepared by coating the material prepared by the above-described method through a coating process. The COF value of the coating is in the range of 0.05 to 0.2, preferably in the range of 0.1 to 0.2.

[0033] Example 1

[0034] A high COF anti-fingerprint coating material, each 100g is composed of the following weight groups: 0.4g of Yicheng A510 anti-fingerprint main agent, 0.05g of organopolysilazane, 0.05g of perfluorodecyltrimethoxysilane, and the balance is a mixed solvent, which is a mixture of octamethylcyclotetrasiloxane and hexafluoropropylene trimer in a ratio of 10:90.

[0035] Example 2

[0036] Each 100g consists of the following components by weight: 0.4g of Yicheng A510 anti-fingerprint agent, 0.05g of organopolysilazane, 0.1g of perfluorodecyltrimethoxysilane, and the remainder is a mixed solvent, which is a mixture of octamethylcyclotetrasiloxane and hexafluoropropylene trimer in a ratio of 50:50.

[0037] Example 3

[0038] Each 100g consists of the following components by weight: 0.4g of Yicheng A510 anti-fingerprint agent, 0.1g of organopolysilazane, 0.1g of perfluorodecyltrimethoxysilane, and the remainder is a mixed solvent, which is a mixture of octamethylcyclotetrasiloxane and hexafluoropropylene trimer in a ratio of 90:10.

[0039] Example 4

[0040] Each 100g consists of the following weight groups: Yicheng A510 anti-fingerprint agent 0.3g, organopolysilazane 0.1g, perfluorooctyltrimethoxysilane 0.1g, perfluorodecyltrimethoxysilane 0.1g, and the balance is a mixed solvent, which is a mixture of hexamethylcyclotrisiloxane: octamethylcyclotetrasiloxane: hexafluoropropylene trimer = 20:30:50.

[0041] Example 5

[0042] Each 100g consists of the following weight groups: Daikin UD509 anti-fingerprint agent 0.4g, organopolysilazane 0.1g, perfluorooctyltrimethoxysilane 0.1g, and the balance is a mixed solvent, which is a mixture of octamethyltrisiloxane: hexafluoropropylene trimer: 2-methoxy-3-trifluoromethyloctafluorobutane = 50:25:25.

[0043] Example 6

[0044] Each 100g consists of the following components by weight: 0.4g of SURECO 3320 anti-fingerprint agent, 0.1g of organopolysilazane, 0.1g of perfluorooctyltrimethoxysilane, and the remainder is a mixed solvent, which is a mixture of octamethyltrisiloxane and perfluoro-3,5-dioxane methyl ether in a ratio of 50:50.

[0045] Example 7

[0046] Each 100g consists of the following components by weight: 0.1g of anti-fingerprint agent, 0.01g of organopolysilazane, 0.01g of nonafluorohexyltrimethoxysilane, and the remainder is a mixed solvent, which is a mixture of hexamethylcyclotrisiloxane and 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether in a ratio of 80:20.

[0047] Example 8

[0048] Each 100g consists of the following weight groups: 2g of anti-fingerprint agent, 0.5g of organopolysilazane, 1g of trifluoropropanetrimethoxysilane, and the remainder is a mixed solvent, which is a mixture of hexamethyldisiloxane and methylnonafluorobutyl ether in a ratio of 30:70.

[0049] Example 9

[0050] Each 100g consists of the following components by weight: 0.1g of anti-fingerprint agent, 2.5g of organopolysilazane, 0.5g of perfluorooctyltriethoxysilane, and the remainder is a mixed solvent, which is a mixture of hexamethylcyclotrisiloxane: octamethyltrisiloxane: perfluorocycloether = 30:20:50.

[0051] Example 10

[0052] Each 100g consists of the following weight groups: 0.3g of anti-fingerprint agent, 2g of organopolysilazane, 0.4g of perfluorodecyltriethoxysilane, and the remainder is a mixed solvent, which is a mixture of decamethylcyclopentasiloxane: 2-methoxy-3-trifluoromethyloctafluorobutane: perfluoro-3,5-dioxanemethyl methyl ether = 40:30:30.

[0053] The preparation method of the above-mentioned high COF anti-fingerprint coating material:

[0054] S1: Weigh out each component according to any one of the group fractions in Examples 1-6;

[0055] S2: Prepare the mixed solvent according to the specified ratio;

[0056] S3: Add the anti-fingerprint agent, organopolynitrosilane, and fluorosilane coupling agent to the mixed solvent, stir at room temperature at a stirring speed of 600 rpm for 4 minutes, and stir until the mixture is homogeneous.

[0057] Comparative Example 1

[0058] The anti-fingerprint liquid was prepared by using Yicheng A510 anti-fingerprint agent and Yicheng hexafluoropropylene trimer diluent. The composition of each 100g anti-fingerprint liquid is: 0.5g of A510 anti-fingerprint agent and 99.5g of hexafluoropropylene trimer diluent.

[0059] Comparative Example 2

[0060] The anti-fingerprint liquid is prepared by combining Daikin UD509 anti-fingerprint agent with Yicheng hexafluoropropylene trimer diluent. The composition of each 100g anti-fingerprint liquid is: 0.5g of UD509 anti-fingerprint agent and 99.5g of hexafluoropropylene trimer diluent.

[0061] Comparative Example 3

[0062] The anti-fingerprint liquid was prepared by combining SURECO 3320 anti-fingerprint agent with Yicheng hexafluoropropylene trimer diluent. The composition of each 100g anti-fingerprint liquid is: 0.5g anti-fingerprint agent and 99.5g hexafluoropropylene trimer diluent.

[0063] In practical use, the anti-fingerprint coating prepared according to any one of the formulations in Examples 1 to 10 and Comparative Examples 1 to 3 is first cleaned by ultrasonic or flatbed cleaning machine and plasma treated on the GG3 glass substrate. Then, the prepared coating is sprayed onto the surface of the GG3 glass substrate by spraying at a rate of 60 g / m², atomization pressure of 30 Psi, and nozzle height of 30 mm. After spraying, the substrate is baked at 150°C for 30 min.

[0064] After the baked glass substrate is cooled to room temperature and left to stand for 2 hours, COF value, water droplet angle, steel wool abrasion resistance, eraser abrasion resistance, and oil-based pen test are performed.

[0065] Steel wool test conditions: Bontar 0000# steel wool, load 1Kg, steel wool area 10*10mm, stroke 40mm, abrasion rate 60Cycles / min.

[0066] Eraser test conditions: Minoan eraser, load 1Kg, eraser diameter 6mm, stroke 40mm, abrasion resistance rate 40Cycles / min.

[0067] COF test conditions: The test instrument is an FPT-F1 coefficient of friction tester, the test medium is oil-absorbing paper, the slider area is 20*20mm, the slider mass is 200g, and the test speed is 150mm / min.

[0068] The test results are shown in Table 1:

[0069] Table 1

[0070]

[0071] In Examples 1-10 above, only a portion of the fluorosilane coupling agents are listed; the remaining substances or combinations are identical in function and technical effect to those in the examples, and will not be listed individually here. Similarly, only a portion of the volatile siloxanes and fluorinated organic solvents are listed in the mixed solvents; the remaining substances or combinations are identical in function and technical effect to those in the examples, and will not be listed individually here.

[0072] In summary, this invention provides a high COF anti-fingerprint coating material, which has the characteristics of relatively simple preparation process, good wear resistance of film layer and easy cleaning. At the same time, the COF value can be adjusted by adjusting the formula, which solves the problem that the existing anti-fingerprint coating has a low COF value and cannot meet the application requirements of certain high COF value scenarios.

Claims

1. A high COF anti-fingerprint coating material, characterized in that, It is made from the following components in weight percentage: 0.1-2% anti-fingerprint agent, 0.01-0.5% organopolysilazane, 0.01-1% fluorosilane coupling agent, and the balance being a mixed solvent; The anti-fingerprint agent is a perfluoropolyether siloxane-based anti-fingerprint treatment agent; The molecular weight of the organopolynitrosilane is 500–2800; The fluorosilane coupling agent is one or more of the following: trifluoropropanetrimethoxysilane, trifluoropropyltriethoxysilane, nonafluorohexyltrimethoxysilane, nonafluorohexyltriethoxysilane, perfluorooctyltrimethoxysilane, perfluorooctyltriethoxysilane, perfluorodecyltrimethoxysilane, and perfluorodecyltriethoxysilane. The mixed solvent is a volatile siloxane: fluorinated organic solvent in a ratio of 10:90 to 90:10; The volatile siloxane is one or more of hexamethyldisiloxane, hexamethylcyclotrisiloxane, octamethyltrisiloxane, octamethylcyclotetrasiloxane, decamethyltetrasiloxane, decamethylcyclopentasiloxane, dodecylpentasiloxane, and dodecylcyclohexasilane; the fluorinated organic solvent is one or more of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, methyl nonafluorobutyl ether, methyl nonafluoroisobutyl ether, ethyl nonafluorobutyl ether, ethyl nonafluoroisobutyl ether, 2-methoxy-3-trifluoromethyloctafluorobutane, perfluoro-3,5-dioxane-hexylmethyl ether, perfluorocyclic ether, and hexafluoropropylene trimer. The COF value of the coating obtained after applying the high COF anti-fingerprint coating material is in the range of 0.05 to 0.

2.

2. The high COF anti-fingerprint coating material according to claim 1, characterized in that: Volatile siloxanes: Fluorinated organic solvents = 50:

50.

3. The high COF anti-fingerprint coating material according to claim 1, characterized in that: The COF value of the coating is between 0.1 and 0.

2.

4. A method for preparing the high COF anti-fingerprint coating material according to claim 1, characterized in that: Includes the following steps: S1: Prepare the anti-fingerprint agent, organopolynitrosilane, and fluorosilane coupling agent according to the stated mass percentages; S2: Prepare the mixed solvent according to the mass ratio, and stir evenly after mixing; S3: Add the anti-fingerprint agent, organic polynitrosilane, and fluorosilane coupling agent to the mixed solvent and stir until homogeneous.

5. A coating material prepared by the method described in claim 4, through a coating process, yields a high COF anti-fingerprint coating, characterized in that: The COF value of the coating is in the range of 0.05 to 0.

2.

6. The high COF anti-fingerprint coating according to claim 5, characterized in that: The COF value of the coating is between 0.1 and 0.2.

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