AF coating method

Abstract

The present application proposes an AF coating method, which relates to the field of coating. An AF coating method includes the following steps: after polishing the surface of the substrate, first clean it with an ethanol solution, take it out and dry it, and then sputter clean it to obtain a treated substrate; weigh fluoroalkyl modified polysiloxane, polyhexafluoropropylene oxide monomethanol, hydrofluoroether and dibutyl tin dilaurate, mix and stir the fluoroalkyl modified polysiloxane, polyhexafluoropropylene oxide monomethanol and hydrofluoroether, heat and heat, add dibutyl tin dilaurate, stir and react to obtain a treated material 1; add the treated material 1 dropwise on the treated substrate, dry it, fill the coating chamber with oxygen and argon, coat the substrate with a silicon dioxide film, a zirconium oxide film and a silicon dioxide film, spray a polytetrafluoroethylene solution on the silicon dioxide film; and dry the substrate. The film layer coated by this method has a low process cost and the coated film layer has better advantages in hydrophobicity, oleophobicity, scratch resistance and fingerprint resistance than the traditional AF coating process.

Description

Technical Field

[0001] The present application relates to the field of film coating, and in particular to an AF film coating method. Background Art

[0002] With the rapid development of various products, some devices have higher requirements for surfaces besides aesthetics. In addition to maintaining the original color appearance and comfortable feel of the product, the screen surface should also be able to maintain excellent properties such as hydrophobicity and oleophobicity, good light transmittance, and ensure that the product surface is not easily left with water stains, oil stains, fingerprints, or scratches. In daily use, we must first touch the touch screen installed on the front of the display with our fingers or other objects. The system then locates and selects information input based on the icon or menu position touched by the finger. Currently, any touch screen has an anti-fingerprint film (AF) on the outside of the glass screen that contacts the finger. On the one hand, this reduces the surface contact friction coefficient, making the finger feel smoother; on the other hand, it makes it easier to clean fingerprints, oil stains, etc. left on the surface after the finger touches the surface.

[0003] Currently, conventional vacuum evaporation methods for AF coating typically utilize a primer treatment (using IAD-assisted vacuum evaporation of SiO2 to form a protective primer layer) to improve the bonding between the AF film and the touchscreen substrate (improving the substrate's surface abrasion resistance). This process is costly and inefficient, and currently lacks significant market competitiveness. Furthermore, existing AF films lack sufficient hydrophobicity, oleophobicity, scratch resistance, and fingerprint resistance. Therefore, a low-cost AF coating method with improved hydrophobicity, oleophobicity, scratch resistance, and fingerprint resistance is urgently needed. Summary of the Invention

[0004] The purpose of the present application is to provide an AF coating method, wherein the film coated by this method has the advantages of low process cost, good hydrophobicity and oleophobicity, scratch resistance and no fingerprints.

[0005] In order to solve the above problems, the technical method adopted by the present invention is:

[0006] The present invention provides an AF coating method, comprising the following steps:

[0007] After polishing the surface of the substrate, the substrate is first cleaned with an ethanol solution, taken out and dried, and then sputter-cleaned to obtain a treated substrate;

[0008] Weighing a fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, hydrofluoroether, and dibutyltin disuccinate, the fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, and hydrofluoroether are mixed and stirred, heated to a high temperature, and dibutyltin disuccinate is added, and the mixture is stirred to react to obtain a treated product 1;

[0009] The treated substance 1 is dropped onto the treated substrate. After drying, oxygen and argon are filled into the coating chamber. The substrate is coated with a silicon dioxide film, a zirconium oxide film, and a silicon dioxide film in sequence. Then, a polytetrafluoroethylene solution is sprayed onto the silicon dioxide film.

[0010] Dry the substrate after spraying polytetrafluoroethylene.

[0011] Compared with the prior art, the invention of this application has at least the following advantages or beneficial effects:

[0012] The present application polishes the surface of the substrate to preliminarily remove surface stains, increases the contact area of ​​the substrate surface, and facilitates the firm connection of subsequent attachments. After sputter cleaning, the cleanliness of the substrate surface can be further ensured, which facilitates the firm connection of subsequent membranes. Since some substrates cannot stably form chemical bonds, a binder is synthesized by dealcoholization reaction of fluoroalkyl-modified polysiloxane and polyhexafluoropropylene oxide monomethanol, which is coated on the surface of the substrate, and can firmly connect to the silicon dioxide film. A zirconium oxide film is then sputtered thereon to enhance the hardness. Due to the silicon-hydrogen bond of silicon dioxide, the bonding strength with zirconium oxide can be improved. A layer of silicon dioxide film is sputtered, and then a layer of polytetrafluoroethylene is sprayed. The polytetrafluoroethylene CF bond is short, the bond energy is strong, the surface free energy is low, and it has a good anti-fouling effect, which can improve the hydrophobicity and anti-fouling properties of the coating, so that the coating not only has good firmness, but also has the advantages of being transparent, hydrophobic, oleophobic, anti-fingerprint and anti-scratch. DETAILED DESCRIPTION

[0013] To make the purpose, technical solutions and advantages of the examples of the present application clearer, the technical solutions in the examples of the present application will be described clearly and completely below. Where specific conditions are not specified in the examples, conventional conditions or conditions recommended by the manufacturer are used. Where the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be purchased commercially.

[0014] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to specific embodiments.

[0015] The present invention provides an AF coating method, comprising the following steps:

[0016] After polishing the surface of the substrate, the substrate is first cleaned with an ethanol solution, taken out and dried, and then sputter-cleaned to obtain a treated substrate;

[0017] Weighing a fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, hydrofluoroether, and dibutyltin disuccinate, the fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, and hydrofluoroether are mixed and stirred, heated to a high temperature, and dibutyltin disuccinate is added, and the mixture is stirred to react to obtain a treated product 1;

[0018] The treated substance 1 is dropped onto the treated substrate. After drying, oxygen and argon are filled into the coating chamber. The substrate is coated with a silicon dioxide film, a zirconium oxide film, and a silicon dioxide film in sequence. Then, a polytetrafluoroethylene solution is sprayed onto the silicon dioxide film.

[0019] Dry the substrate after spraying polytetrafluoroethylene.

[0020] In some embodiments of the present application, after the surface of the substrate is polished, it is ultrasonically treated with an ethanol solution for 10-20 minutes.

[0021] The present application polishes the surface of the substrate to preliminarily remove surface stains, increases the contact area of ​​the substrate surface, and facilitates the firm connection of subsequent attachments. After sputter cleaning, the substrate surface can be further kept clean, facilitating the firm connection of subsequent membranes. Since some substrates cannot stably form chemical bonds, a binder is synthesized by dealcoholization reaction of fluoroalkyl-modified polysiloxane and polyhexafluoropropylene oxide monomethanol, which is coated on the surface of the substrate, and can firmly connect to the silicon dioxide film. A zirconium oxide film is then sputtered thereon to enhance the hardness. Due to the silicon-hydrogen bond of silicon dioxide, the bonding strength with zirconium oxide can be improved. A layer of silicon dioxide film is sputtered, and then a layer of polytetrafluoroethylene is sprayed. The CF bond of polytetrafluoroethylene is short, the bond energy is strong, the surface free energy is low, and it has a good anti-fouling effect, which can improve the hydrophobicity and anti-fouling properties of the coating. By improving its hydrophobicity, the coating not only has good firmness, but also has the advantages of being transparent, hydrophobic, oleophobic, anti-fingerprint and anti-scratch.

[0022] In some embodiments of the present application, the sputter cleaning is specifically performed for 15-30 minutes in an argon environment at a vacuum degree of 50-80 Pa. Under such conditions, sputter cleaning can ensure that the surface of the substrate is clean.

[0023] In some embodiments of the present application, the mass ratio of the fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, hydrofluoroether, and dibutyltin dilaurate is 1:0.9-1.1:3-5:0.01-0.05. The resulting treated material 1 not only exhibits excellent bonding strength but is also easily degradable and environmentally friendly.

[0024] In some embodiments of the present application, the fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol and hydrofluoroether are mixed and stirred, and then the temperature is raised to 49-55° C., dibutyltin dilaurate is added, and the mixture is stirred and reacted for 2-4 hours.

[0025] In some embodiments of the present application, the above-mentioned treatment material 1 is dropped onto the treated substrate and dried at 65-80° C. for 10-20 minutes.

[0026] In some embodiments of the present application, the above-mentioned sputtering coating conditions are to fill the coating chamber with oxygen and argon in a volume ratio of 1:3, and to sequentially coat the substrate with silicon dioxide film, zirconium oxide film and silicon dioxide film under the working gas pressure of 1.8-2.3 Pa and the current of 7-9 A.

[0027] In some embodiments of the present application, the thickness of the silicon dioxide film is 10-20 nm, the thickness of the zirconium oxide film is 80-100 nm, and the thickness of the silicon dioxide film is 30-50 nm.

[0028] In some embodiments of the present application, the drying temperature of the substrate after spraying polytetrafluoroethylene is 150-160°C.

[0029] In some embodiments of the present application, the substrate comprises metal or glass. Preferably, the substrate is metal.

[0030] The features and performance of the present application are further described in detail below with reference to the embodiments.

[0031] Example 1

[0032] An AF coating method comprises the following steps:

[0033] After polishing the surface of the substrate, the substrate was ultrasonically treated with an ethanol solution for 10 minutes, taken out and dried, and then placed in an argon environment and sputter-cleaned at a vacuum degree of 50 Pa for 15 minutes to obtain a treated substrate;

[0034] Fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, hydrofluoroether, and dibutyltin disuccinate were weighed in a mass ratio of 1:0.9:3:0.01, the fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, and hydrofluoroether were mixed and stirred, the temperature was raised to 49° C., dibutyltin disuccinate was added, and the mixture was stirred for 2 h to obtain a treated product 1;

[0035] The treated substance 1 was dropped onto the treated substrate and dried at 65°C for 10 min. The coating chamber was filled with oxygen and argon at a volume ratio of 1:3. A silicon dioxide film, a zirconium oxide film, and a silicon dioxide film were sequentially coated on the substrate at a working pressure of 1.8 Pa and a current of 7 A. A polytetrafluoroethylene solution with a concentration of 0.07 g / mL was then sprayed onto the silicon dioxide film. The thickness of the silicon dioxide film was 10 nm, the thickness of the zirconium oxide film was 80 nm, and the thickness of the silicon dioxide film was 30 nm.

[0036] The substrate after spraying polytetrafluoroethylene was dried at 150°C.

[0037] Example 2

[0038] An AF coating method comprises the following steps:

[0039] After polishing the surface of the substrate, the substrate was ultrasonically treated with an ethanol solution for 13 minutes, taken out and dried, and then placed in an argon environment and sputter-cleaned at a vacuum degree of 60 Pa for 20 minutes to obtain a treated substrate;

[0040] Fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, hydrofluoroether, and dibutyltin disuccinate were weighed in a mass ratio of 1:1:3:0.02, the fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, and hydrofluoroether were mixed and stirred, the temperature was raised to 50° C., dibutyltin disuccinate was added, and the mixture was stirred for 2.5 hours to obtain a treated product 1;

[0041] The treated substance 1 was dropped onto the treated substrate and dried at 68°C for 13 min. The coating chamber was filled with oxygen and argon at a volume ratio of 1:3. A silicon dioxide film, a zirconium oxide film, and a silicon dioxide film were sequentially coated on the substrate at a working pressure of 2 Pa and a current of 8 A. A polytetrafluoroethylene solution with a concentration of 0.08 g / mL was then sprayed onto the silicon dioxide film. The thickness of the silicon dioxide film was 13 nm, the thickness of the zirconium oxide film was 90 nm, and the thickness of the silicon dioxide film was 35 nm.

[0042] The substrate after spraying polytetrafluoroethylene was dried at 155°C.

[0043] Example 3

[0044] An AF coating method comprises the following steps:

[0045] After polishing the surface of the substrate, the substrate was ultrasonically treated with an ethanol solution for 15 minutes, taken out and dried, and then placed in an argon environment and sputter-cleaned at a vacuum degree of 65 Pa for 20 minutes to obtain a treated substrate;

[0046] Fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, hydrofluoroether, and dibutyltin disuccinate were weighed in a mass ratio of 1:0.9:4:0.03, the fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, and hydrofluoroether were mixed and stirred, the temperature was raised to 52° C., dibutyltin disuccinate was added, and the mixture was stirred for 3 h to obtain a treated product 1;

[0047] The treated substance 1 was dropped onto the treated substrate and dried at 70°C for 15 min. The coating chamber was filled with oxygen and argon at a volume ratio of 1:3. A silicon dioxide film, a zirconium oxide film, and a silicon dioxide film were sequentially coated on the substrate at a working pressure of 2 Pa and a current of 8 A. A polytetrafluoroethylene solution with a concentration of 0.08 g / mL was then sprayed onto the silicon dioxide film. The thickness of the silicon dioxide film was 15 nm, the thickness of the zirconium oxide film was 90 nm, and the thickness of the silicon dioxide film was 40 nm.

[0048] The substrate after spraying polytetrafluoroethylene was dried at 155°C.

[0049] Example 4

[0050] An AF coating method comprises the following steps:

[0051] After polishing the surface of the substrate, the substrate was ultrasonically treated with an ethanol solution for 20 minutes, taken out and dried, and then placed in an argon environment and sputter-cleaned at a vacuum degree of 75 Pa for 25 minutes to obtain a treated substrate;

[0052] Fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, hydrofluoroether, and dibutyltin disuccinate were weighed in a mass ratio of 1:1.1:5:0.4, the fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, and hydrofluoroether were mixed and stirred, the temperature was raised to 53° C., dibutyltin disuccinate was added, and the mixture was stirred for 3 h to obtain a treated product 1;

[0053] The treated substance 1 was dropped onto the treated substrate and dried at 75°C for 18 minutes. The coating chamber was filled with oxygen and argon at a volume ratio of 1:3. A silicon dioxide film, a zirconium oxide film, and a silicon dioxide film were sequentially coated on the substrate at a working pressure of 2.2 Pa and a current of 8 A. A polytetrafluoroethylene solution with a concentration of 0.08 g / mL was then sprayed onto the silicon dioxide film. The thickness of the silicon dioxide film was 18 nm, the thickness of the zirconium oxide film was 90 nm, and the thickness of the silicon dioxide film was 45 nm.

[0054] The substrate after spraying polytetrafluoroethylene was dried at 155°C.

[0055] Example 5

[0056] An AF coating method comprises the following steps:

[0057] After polishing the surface of the substrate, the substrate was ultrasonically treated with an ethanol solution for 20 minutes, taken out and dried, and then placed in an argon environment and sputter-cleaned at a vacuum degree of 80 Pa for 30 minutes to obtain a treated substrate;

[0058] Fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, hydrofluoroether, and dibutyltin disuccinate were weighed in a mass ratio of 1:1.1:5:0.05, the fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, and hydrofluoroether were mixed and stirred, the temperature was raised to 55° C., dibutyltin disuccinate was added, and the mixture was stirred and reacted for 4 hours to obtain a treated product 1;

[0059] The treated substance 1 was dropped onto the treated substrate and dried at 80°C for 20 min. The coating chamber was filled with oxygen and argon at a volume ratio of 1:3. A silicon dioxide film, a zirconium oxide film, and a silicon dioxide film were sequentially coated on the substrate at a working pressure of 2.3 Pa and a current of 9 A. A polytetrafluoroethylene solution with a concentration of 0.09 g / mL was then sprayed onto the silicon dioxide film. The thickness of the silicon dioxide film was 20 nm, the thickness of the zirconium oxide film was 100 nm, and the thickness of the silicon dioxide film was 50 nm.

[0060] The substrate after spraying polytetrafluoroethylene was dried at 160°C.

[0061] Comparative Example 1

[0062] This comparative example is basically the same as Example 3, except that the treated substance 1 is not dropped onto the treated substrate, but is directly plated.

[0063] An AF coating method comprises the following steps:

[0064] After polishing the surface of the substrate, the substrate was ultrasonically treated with an ethanol solution for 15 minutes, taken out and dried, and then placed in an argon environment and sputter-cleaned at a vacuum degree of 65 Pa for 20 minutes to obtain a treated substrate;

[0065] The coating chamber was filled with oxygen and argon at a volume ratio of 1:3. Under the conditions of working pressure of 2 Pa and current of 8 A, silicon dioxide film, zirconium oxide film and silicon dioxide film were deposited on the substrate in sequence. Then, a polytetrafluoroethylene solution with a concentration of 0.08 g / mL was sprayed on the silicon dioxide film. The thickness of the silicon dioxide film was 15 nm, the thickness of the zirconium oxide film was 90 nm, and the thickness of the silicon dioxide film was 40 nm.

[0066] The substrate after spraying polytetrafluoroethylene was dried at 155°C.

[0067] Comparative Example 2

[0068] This comparative example is basically the same as Example 3, except that no coating is performed and polytetrafluoroethylene is directly sprayed.

[0069] An AF coating method comprises the following steps:

[0070] After polishing the surface of the substrate, the substrate was ultrasonically treated with an ethanol solution for 15 minutes, taken out and dried, and then placed in an argon environment and sputter-cleaned at a vacuum degree of 65 Pa for 20 minutes to obtain a treated substrate;

[0071] Fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, hydrofluoroether, and dibutyltin disuccinate were weighed in a mass ratio of 1:0.9:4:0.03, the fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, and hydrofluoroether were mixed and stirred, the temperature was raised to 52° C., dibutyltin disuccinate was added, and the mixture was stirred for 3 h to obtain a treated product 1;

[0072] The treated substance 1 was added dropwise onto the treated substrate and dried at 70°C for 15 min. Then, a polytetrafluoroethylene solution with a concentration of 0.08 g / mL was sprayed onto the dried treated substrate.

[0073] The substrate after spraying polytetrafluoroethylene was dried at 155°C.

[0074] Experimental example

[0075] (1) Contact angle test

[0076] A water contact angle tester (SDC200) was used. The samples were the samples of Examples 1-5 and Comparative Examples 1-2. Distilled water was used as a probe liquid and dropped on the surfaces of the samples of Examples 1-5 and Comparative Examples 1-2 to test the contact angle. The water drop size was 5 μL. The contact angle ≥110° was considered qualified.

[0077] (2) Oil pen stain resistance test

[0078] A commercially available oil-based ink pen was used to draw a blue line on the surface of the samples of Examples 1-5 and Comparative Examples 1-2. The stain resistance was evaluated based on the shrinkage of the blue humor. Grade A was considered acceptable. The evaluation criteria were as follows:

[0079] C: no shrinkage, forming a line;

[0080] B: shrinks to a dotted line;

[0081] A: Shrink into a point.

[0082] (3) Friction resistance test

[0083] Using a friction tester, take a contact area of ​​10*10mm, under the conditions of a pressure of 1kg, a friction speed of 60 times / min, and a friction stroke of 40mm, use steel wool to rub the surface of the samples of Examples 1-5 and Comparative Examples 1-2 3000 times, and then use the contact angle test method to perform a contact angle test. The contact angle ≥105° is qualified.

[0084] The results are shown in Table 1.

[0085] Table 1

[0086] Sample Contact angle / ° Stain resistance / grade Friction resistance / ° Example 1 135.9 A 130.2 Example 2 140.6 A 135.6 Example 3 143.2 A 140.1 Example 4 140.1 A 132.4 Example 5 142.3 A 133.9 Comparative Example 1 143.1 A 93.4 Comparative Example 2 142.9 A 101.9

[0087] Table 1 shows that the samples coated with the present embodiment exhibit large water contact angles, excellent hydrophobicity and oleophobicity, and excellent wear resistance. Comparing Example 3 with Comparative Examples 1-2, the poor wear resistance of Comparative Example 1 is likely due to the lack of Treated Material 1 as a bonding layer, resulting in poor adhesion between the subsequent coating and the substrate, making the coating easily detached and leading to poor wear resistance. The poor wear resistance of Comparative Example 2 is likely due to the lack of coating, resulting in poor hardness and inability to provide good wear resistance.

[0088] In summary, the present application polishes the surface of the substrate to preliminarily remove surface stains, increases the contact area of ​​the substrate surface, and facilitates the firm connection of subsequent attachments. After sputtering cleaning, the substrate surface can be further ensured to be clean, which is convenient for the subsequent firm connection of the film. Since some substrates cannot stably form chemical bonds, a binder is synthesized by dealcoholization reaction of fluoroalkyl-modified polysiloxane and polyhexafluoropropylene oxide monomethanol, which is coated on the surface of the substrate, and can firmly connect to the silica film. Then, a zirconium oxide film is sputtered thereon to enhance the hardness. Due to the silicon-hydrogen bond of silica, the bonding strength with zirconium oxide can be improved. A layer of silica film is sputtered, and then a layer of polytetrafluoroethylene is sprayed. The polytetrafluoroethylene CF bond is short, the bond energy is strong, the surface free energy is low, and it has a good anti-fouling effect, which can improve the hydrophobicity and anti-fouling properties of the coating, so that the coating not only has good firmness, but also has the advantages of being transparent, hydrophobic, oleophobic, anti-fingerprint and anti-scratch.

[0089] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

Claims

1. An AF coating method, characterized in that: The steps include: After polishing the surface of the substrate, the substrate is first cleaned with an ethanol solution, taken out and dried, and then sputter-cleaned to obtain a treated substrate; Weighing a fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, hydrofluoroether, and dibutyltin disuccinate, stirring the fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, and hydrofluoroether, heating the mixture to a high temperature, adding dibutyltin disuccinate, and stirring the mixture to react to obtain a treated product 1; the mass ratio of the fluoroalkyl-modified polysiloxane, polyhexafluoropropylene oxide monomethanol, hydrofluoroether, and dibutyltin disuccinate is 1:0.9-1.1:3-5:0.01-0.05; The treated substance 1 is dropped onto the treated substrate. After drying, oxygen and argon are filled into the coating chamber. The substrate is coated with a silicon dioxide film, a zirconium oxide film, and a silicon dioxide film in sequence. Then, a polytetrafluoroethylene solution is sprayed onto the silicon dioxide film. Dry the substrate after spraying polytetrafluoroethylene.

2. The AF coating method according to claim 1, wherein: After the surface of the substrate is polished, it is ultrasonically treated with an ethanol solution for 10-20 minutes.

3. The AF coating method according to claim 1, wherein: The sputter cleaning is specifically performed under an argon environment and a vacuum degree of 50-80 Pa for 15-30 minutes.

4. The AF coating method according to claim 1, wherein: The fluoroalkyl modified polysiloxane, polyhexafluoropropylene oxide monomethanol and hydrofluoroether are mixed and stirred, and then the temperature is raised to 49-55° C., dibutyltin dilaurate is added, and the mixture is stirred and reacted for 2-4 hours.

5. The AF coating method according to claim 1, characterized in that: The treated substance 1 is added dropwise onto the treated substrate and dried at 65-80° C. for 10-20 min.

6. The AF coating method according to claim 1, characterized in that: The sputtering coating conditions are as follows: oxygen and argon with a volume ratio of 1:3 are filled into the coating chamber, and silicon dioxide film, zirconium oxide film and silicon dioxide film are sequentially coated on the substrate under the working pressure of 1.8-2.3 Pa and the current of 7-9 A.

7. The AF coating method according to claim 1, characterized in that: The thickness of the silicon dioxide film is 10-20 nm, the thickness of the zirconium oxide film is 80-100 nm, the thickness of the silicon dioxide film is 30-50 nm, and the concentration of the polytetrafluoroethylene solution is 0.07-0.09 g / mL.

8. The AF coating method according to claim 1, characterized in that: The drying temperature of the substrate after spraying polytetrafluoroethylene is 150-160°C.