Method for shielding assembly area of glass substrate plated with AF film and application

Abstract

The invention discloses a method for shielding an assembling area of a glass substrate plated with an AF film and application, the method comprises the following steps: plating the whole surface of the glass substrate of which the assembling area is silk-screened with a modified hydrosol layer, and washing and removing the modified hydrosol in the assembling area of the glass substrate; when the modified hydrosol used in the invention is screen-printed on the glass substrate, a good edge protection effect is achieved; the method for shielding the assembly area has the advantages of high precision, low cost, easiness in operation, high productivity and high yield, and industrial mass production is facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of glass processing, and particularly relates to a method and application for shielding an assembly area of a glass substrate coated with an AF film. Background Art

[0002] At present, in order to improve the anti-fouling and anti-fingerprint ability of the glass surface, coating an AF film on the glass surface is the most common practice. Although the low surface energy of the AF film can endow it with strong hydrophobicity and anti-fouling and anti-fingerprint abilities, it also makes it impossible for subsequent assemblies to adhere firmly to the surface of the AF film. Therefore, in the prior art, in order to enable the components to adhere firmly to the glass substrate coated with the AF film, it is necessary to pre-cover a coating on the assembly area of the glass surface, and then cover a functional film on the glass surface.

[0003] At present, most of the methods for covering the coating in the assembly area are screen printing of ink. Although the ink can prevent the assembly area of the glass surface from being coated with the AF film, this method has low precision, high cost and is not easy to operate. In addition, laser engraving to remove the ink will also cause certain damage to the glass substrate.

[0004] For this reason, the present invention proposes a new process to solve the problem of shielding the assembly area. Summary of the Invention

[0005] To solve the technical problems existing in the background art, the present invention proposes a

[0006] A method for shielding an assembly area of a glass substrate coated with an AF film proposed by the present invention includes the following steps:

[0007] S1. Screen-print a modified hydrocolloid on the assembly area of the glass substrate and cure it;

[0008] S2. Coat an AF film layer on the surface of the glass substrate on which the hydrocolloid is screen-printed in step S1;

[0009] S3. Remove the hydrocolloid in the assembly area of the glass substrate coated with the AF film in step S2.

[0010] Compared with screen printing ink in the prior art, screen-printing the modified hydrocolloid in the assembly area has higher precision (0.01 mm).

[0011] In step S1, the modified hydrocolloid includes the following raw materials in parts by weight: 5-15 parts of deionized water, 30-60 parts of plasticizer, 0.3-0.8 parts of zinc stearate, 0.3-0.8 parts of calcium stearate, 0.3-0.8 parts of magnesium stearate, and 40-70 parts of PVC paste resin.

[0012] In the present invention, stearates of appropriate types and proportions can form a continuous lubricating layer on the surface of the PVC molecular chain, thereby increasing the fluidity of the modified hydrocolloid.

[0013] The modified hydrocolloid is prepared by the following steps: mixing the raw materials in sequence according to deionized water, plasticizer, zinc stearate, calcium stearate, magnesium stearate and PVC paste resin;

[0014] Preferably, the mixing temperature is 50-70°C;

[0015] Preferably, the mixing method is stirring, and the stirring speed is 100-600 r / min.

[0016] When preparing the modified hydrocolloid, it also includes a condensation reaction of zinc stearate, calcium stearate and magnesium stearate with a silane coupling agent;

[0017] Preferably, the condensation reaction is carried out by hydrolyzing the silane coupling agent and then carrying out a condensation reaction with zinc stearate, calcium stearate and magnesium stearate.

[0018] In the present invention, the stearate in the modified hydrocolloid can produce a certain lubricating effect. However, when the glue is stored for a long time, the presence of water in the system will weaken the binding between the stearate and the PVC molecular chain and damage the integrity of the lubricating layer; after the stearate and the silane coupling agent carry out a condensation reaction, they can form a continuous and stable lubricating layer on the surface of the PVC molecular chain, which can not only increase the storage time of the glue, but also make it not easy to produce serrated printing edges when the modified hydrocolloid is screen-printed on the surface of the glass substrate, resulting in a good edge protection effect.

[0019] The silane coupling agent has both organic groups and hydrolyzable groups. Among them, the hydrolyzable groups (alkoxy, acetoxy, chloro) of the silane coupling agent hydrolyze to produce silanol. On the one hand, the hydroxyl group (-OH) in the silanol undergoes a condensation reaction with the hydrogen on the carboxyl group of the stearate, removing a molecule of water to form a structure similar to -Si-O-C(=O)-R (R is the carbon chain part of stearic acid). In this way, the silane coupling agent is chemically bonded to the stearate; on the other hand, the silanol is chemically bonded to the chlorine atom on the PVC molecular chain. Thus, the stearate is adsorbed on the surface of the PVC molecular chain through the silane coupling agent, and the long-chain fatty acid structure of the stearate forms a continuous and stable lubricating layer on the surface of the PVC molecule, synergistically enhancing the lubricating effect and improving the fluidity of the hydrocolloid; due to the special long-chain fatty acid structure of the stearate, it can play a role similar to a "molecular spring" during the lubrication process. Therefore, the lubricating layer formed by the silane coupling agent and the stearate can also adapt to external forces through a certain degree of twisting and sliding, prevent the PVC molecular chains from approaching and entangling, reduce the internal friction of the system, and further improve the fluidity of the hydrocolloid.

[0020] In step 1, the thickness of the modified hydrocolloid screen-printed in the assembly area is 8 - 100 μm, the curing temperature of the modified hydrocolloid is 60 - 100 °C, and the curing time is 20 - 50 min.

[0021] In step S2, the thickness of the AF film layer on the glass substrate is 5 - 80 μm.

[0022] In step S3, the hydrocolloid in the assembly area is removed by a brush-type cleaning machine, and the cleaning medium at 40 - 60 °C is required when the brush-type cleaning machine removes the hydrocolloid.

[0023] The cleaning medium is one of a neutral cleaning agent, ethanol, or an isopropyl alcohol aqueous solution;

[0024] Preferably, the cleaning medium is an aqueous solution of a neutral cleaning agent;

[0025] Preferably, the cleaning time is 2 - 20 min.

[0026] In the present invention, under the dual action of heating and the cleaning medium, the modified hydrocolloid layer will swell, causing the phase interface with the glass substrate to loosen. When the adhesive layer is removed, the AF film is not affected.

[0027] The present invention also proposes an application of a method for shielding the assembly area of an AF film-coated glass substrate in a mobile phone glass back cover.

[0028] The mobile phone glass cover plate is one of a smooth surface, an AG surface, or a smooth and matte same surface;

[0029] Preferably, the thickness of the mobile phone glass back cover is 0.1 - 2 mm.

[0030] Advantages of the present invention:

[0031] (1) The modified hydrocolloid screen-printed in the assembly area has high precision (0.01 mm), high speed (50 pieces / minute), easy removal, and high yield.

[0032] (2) Compared with screen-printing ink in the assembly area and then laser engraving to remove part of the ink thickness, the process is simpler and suitable for industrial production.

[0033] (3) In the modified hydrocolloid, a continuous and stable lubricating layer is formed on the surface of the PVC molecular chain, which not only improves the fluidity of the modified hydrocolloid but also increases the storage time of the modified hydrocolloid. Description of the drawings

[0034] Figure 1 It is a smooth glass substrate after screen-printing hydrocolloid in Example 1;

[0035] Figure 2 It is an AG glass substrate with hydrocolloid screen-printed well in Example 2. Detailed implementation manners

[0036] For ease of understanding the present invention, the present invention will be more comprehensively described below in conjunction with specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0037] 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 the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0038] Below, the technical solutions of the present invention will be described more clearly and completely in conjunction with specific examples and comparative examples.

[0039] Example 1

[0040] This example proposes a method for masking the assembly area of an AF film plated on a glass substrate, and the specific steps are as follows:

[0041] (1) Take a smooth glass substrate with a glass thickness of 0.55 mm, clean the surface of the glass substrate using a flat panel cleaning machine (miniature flat panel machine ZC-8456), with a cleaning temperature of 50 °C and a cleaning time of 60 s, and dry the cleaned smooth glass substrate for standby;

[0042] (2) In the assembly area of the smooth glass substrate, screen-print a modified hydrocolloid with a thickness of 20 μm, and dry the smooth glass substrate screen-printed with the modified hydrocolloid in an oven, with a drying temperature of 80 °C and a drying time of 30 min;

[0043] Among them, the modified hydrocolloid used in screen printing in step (2) is obtained through the following preparation method: Weigh deionized water, PVC paste resin, trioctyl trimellitate, zinc stearate, calcium stearate, and magnesium stearate according to a mass ratio of 8.1:45:45:0.6:0.6:0.7, and prepare a 20 wt% ethanol solution of trioctyl trimellitate for standby; under the conditions of a stirring speed of 150 r / min and a temperature of 50 °C, add the raw materials to the beaker in the order of deionized water, trioctyl trimellitate ethanol solution, zinc stearate, calcium stearate, magnesium stearate, and PVC paste resin. After the PVC paste resin is completely added, the temperature is raised to 70 °C, the stirring speed is increased to 600 r / min, and stirring is continued for 30 minutes to obtain a hydrocolloid.

[0044] (3) Place the smooth glass substrate screen-printed with the modified hydrocolloid in step (2) in a coating machine, and deposit a layer of AF film with a uniform thickness of 10 μm on the glass surface;

[0045] (4) Place the glass substrate coated with film in step (3) in the cleaning medium, and use a brush-type cleaning machine to clean it for 10 min to remove the modified hydrocolloid in the assembly area, obtaining the glass substrate to be assembled; the brush material is soft nylon with a Shore hardness of 30 HA, the pressure exerted by the brush on the glass surface is 0.1 MPa, the rotational speed of the brush is 50 r / min, the cleaning process temperature is 50 °C, and the cleaning medium is an aqueous solution of a neutral cleaning agent (alkyl polyglycoside 5 wt%, fatty alcohol polyoxyethylene ether 3 wt%).

[0046] Example 2

[0047] This example proposes a method for masking the assembly area of an AF film-coated glass substrate, and the specific steps are as follows:

[0048] (1) Take an AG-side glass substrate with a glass thickness of 0.50 mm, and use a flat cleaning machine (miniature flat machine ZC-8456) to clean the surface of the glass substrate. The cleaning temperature is 50 °C, and the cleaning time is 60 s. Dry the cleaned AG-side glass substrate for standby;

[0049] (2) In the assembly area of the AG-side glass, screen-print a modified hydrocolloid with a thickness of 30 μm. Dry the AG-side glass substrate screen-printed with the modified hydrocolloid in an oven. The drying temperature is 80 °C, and the drying time is 30 min;

[0050] Among them, the modified hydrocolloid used in screen printing in step (2) is obtained through the following preparation method: Weigh deionized water, PVC paste resin, trioctyl trimellitate, zinc stearate, calcium stearate, and magnesium stearate according to a mass ratio of 14:45:40:0.3:0.4:0.3, and prepare a 20 wt% solution of trioctyl trimellitate with ethanol for standby; under the conditions of a stirring speed of 150 r / min and a temperature of 50 °C, add the raw materials to the beaker in the order of deionized water, trioctyl trimellitate ethanol solution, zinc stearate, calcium stearate, magnesium stearate, and PVC paste resin. When the PVC paste resin is completely added, raise the temperature to 70 °C, increase the stirring speed to 500 r / min, and continuously stir for 30 minutes to obtain the hydrocolloid.

[0051] (3) Place the AG-side glass substrate screen-printed with the modified hydrocolloid in step (2) in a coating machine, and coat a layer of AF film with a uniform thickness of 20 μm on the glass surface;

[0052] (4) Place the glass substrate coated with film in step (3) in a cleaning medium, and use a brushing cleaning machine to clean it for 10 minutes to remove the modified hydrocolloid in the assembly area, obtaining the glass substrate with an AG surface to be assembled; the brush material is soft nylon with a Shore hardness of 30HA, the pressure exerted by the brush on the glass surface is 0.1 MPa, the rotational speed of the brush is 50 r / min, the cleaning temperature is 50 °C, and the cleaning medium is an aqueous solution of a neutral cleaning agent (alkyl polyglycoside 6 wt%, fatty alcohol polyoxyethylene ether 5 wt%).

[0053] Example 3

[0054] This example proposes a method for masking the assembly area of a glass substrate coated with an AF film, and the specific steps are as follows:

[0055] (1) Take a smooth glass substrate with a glass thickness of 0.55 mm, and use a flat cleaning machine (miniature flat machine ZC-8456) to clean the surface of the glass substrate. The cleaning process temperature is 50 °C, the cleaning time is 60 s, and the glass surface cleanliness is observed from multiple angles under strong light irradiation. Dry the cleaned glass substrate for standby;

[0056] (2) In the assembly area of the smooth glass substrate, screen-print a modified hydrocolloid with a thickness of 20 μm, and dry the glass substrate screen-printed with the modified hydrocolloid in an oven. The drying temperature is 80 °C, and the drying time is 45 minutes;

[0057] Among them, the modified hydrocolloid used in screen printing in step (2) is obtained through the following preparation method: Weigh deionized water, PVC paste resin, trioctyl trimellitate, 3-hydroxypropyltrimethoxysilane, zinc stearate, calcium stearate, and magnesium stearate according to a mass ratio of 12.5:45:40:1:0.5:0.7:0.3, and prepare a 20 wt% solution of trioctyl trimellitate with ethanol for standby; under the conditions of a stirring speed of 150 r / min and a temperature of 50 °C, add the raw materials to the beaker in the order of deionized water, trioctyl trimellitate ethanol solution, 3-hydroxypropyltrimethoxysilane, zinc stearate, calcium stearate, magnesium stearate, and PVC paste resin. When the PVC paste resin is completely added, the temperature rises to 70 °C, and the stirring speed is increased to 600 r / min, and continue to stir for 30 minutes to obtain a hydrocolloid;

[0058] (3) Place the smooth glass substrate screen-printed with the modified hydrocolloid in step (2) in a coating machine, and coat a layer of AF film with a uniform thickness of 10 μm on the glass surface;

[0059] (4) Place the coated smooth glass substrate in step (3) in a cleaning medium and clean it with a brush-type cleaning machine for 10 min to remove the modified hydrocolloid in the assembly area, obtaining a smooth glass substrate to be assembled; the brush material is soft nylon with a Shore hardness of 30 HA, the pressure exerted by the brush on the glass surface is 0.1 MPa, the brush rotation speed is 50 r / min, the cleaning temperature is 50 °C, and the cleaning medium is an aqueous solution of a neutral cleaning agent (alkyl polyglycoside 5 wt%, fatty alcohol polyoxyethylene ether 3 wt%).

[0060] Example 4

[0061] This example proposes a method for shielding the assembly area of an AF film coated on a glass substrate, and the specific steps are as follows:

[0062] (1) Take an AG surface glass substrate with a glass thickness of 0.50 mm, and clean the surface of the glass substrate with a flat cleaning machine (micro flat machine ZC-8456). The cleaning process temperature is 50 °C and the cleaning time is 60 s. Dry the cleaned glass substrate for later use;

[0063] (2) In the assembly area of the AG surface glass substrate, screen-print a hydrocolloid with a thickness of 20 μm. Dry the glass substrate with the screen-printed modified hydrocolloid in an oven. The drying temperature is 80 °C and the drying time is 45 min;

[0064] Among them, the modified hydrocolloid used in screen printing in step (2) is obtained through the following preparation method: Weigh deionized water, PVC paste resin, trioctyl trimellitate, 3-hydroxypropyltriethoxysilane, zinc stearate, calcium stearate, and magnesium stearate according to a mass ratio of 9:47:41:1.5:0.5:0.7:0.3, and prepare a 20 wt% solution of trioctyl trimellitate with ethanol for later use; under the conditions of a stirring speed of 150 r / min and a temperature of 50 °C, add the raw materials to the beaker in the order of deionized water, trioctyl trimellitate ethanol solution, 3-hydroxypropyltriethoxysilane, zinc stearate, calcium stearate, magnesium stearate, and PVC paste resin. When the PVC paste resin is completely added, raise the temperature to 70 °C, increase the stirring speed to 600 r / min, and continuously stir for 30 minutes to obtain a hydrocolloid;

[0065] (3) Place the AG surface glass substrate screen-printed with the modified hydrocolloid in step (2) in a coating machine and coat a layer of AF film with a uniform thickness of 10 μm on the glass surface;

[0066] (4) Place the AG surface glass substrate coated with film in step (3) in a cleaning medium, and use a brush-type cleaning machine to clean it for 10 min to remove the hydrocolloid in the assembly area, obtaining the glass substrate to be assembled; the brush material is soft nylon with a Shore hardness of 30 HA, the pressure exerted by the brush on the glass surface is 0.1 MPa, the brush rotation speed is 50 r / min, the cleaning temperature is 50 °C, and the cleaning medium is an aqueous solution of a neutral cleaning agent (alkyl polyglycoside 7 wt%, fatty alcohol polyoxyethylene ether 2 wt%).

[0067] As Figure 1 shown, the area 1 is the assembly area of the smooth glass in Example 1, used for screen-printing the modified hydrocolloid; as Figure 2 shown, the area 1 is the assembly area of the AG surface glass in Example 2, used for screen-printing the modified hydrocolloid.

[0068] Comparative Example 1

[0069] This comparative example presents a method for masking the assembly area of a glass substrate coated with an AF film, and the specific steps are as follows:

[0070] (1) Take a smooth glass substrate with a glass thickness of 0.55 mm, and use a flat-panel cleaning machine (miniature flat-panel machine ZC-8456) to clean the surface of the glass substrate. The cleaning process temperature is 50 °C, and the cleaning time is 60 s. Dry the cleaned glass substrate for standby;

[0071] (2) Screen-print an ink with a thickness of 20 μm in the assembly area of the smooth glass substrate. Dry the glass substrate screen-printed with the ink in an oven. The drying temperature is 80 °C, and the drying time is 30 min;

[0072] Among them, the ink used in screen-printing in step (2) is prepared from 50% epoxy resin, 10% iron oxide, 0.3% defoaming agent, 9.7% plasticizer, etc. and 30% methyl ethyl ketone;

[0073] (3) Place the glass substrate screen-printed with the ink in step (2) in a coating machine, and coat a layer of AF film with a uniform thickness of 10 μm on the glass surface;

[0074] (4) Use an ultraviolet laser engraving device to remove part of the ink from the glass substrate coated with the AF film in step (3) to obtain the glass substrate to be assembled. The laser power is 0.95 W, the speed is 350 mm / s, and the frequency is 30 kHz.

[0075] Comparative Example 2

[0076] This comparative example presents a method for masking the assembly area of a glass substrate coated with an AF film. Its specific steps are the same as those in Example 1, except that magnesium stearate is omitted in the preparation of the hydrocolloid in step (2).

[0077] Comparative Example 3

[0078] This comparative example presents a method for masking the assembly area of an AF film-coated glass substrate. The specific operating steps are the same as those in Example 3, except that the mass ratio of the hydrocolloid components in step (2), which is "12.5:45:40:1:0.5:0.7:0.3", is changed to "12.5:45:40:5:0.5:0.7:0.3".

[0079] Comparative Example 4

[0080] This comparative example presents a method for masking the assembly area of an AF film-coated glass substrate. The specific operating steps are the same as those in Example 3, except that the mass ratio of the components of the hydrocolloid in step (2), which is "12.5:45:40:1:0.5:0.7:0.3", is changed to "12.5:45:40:1:0.2:0.1:1.2".

[0081] Adhesion performance test

[0082] In the following adhesion performance test, polycarbonate plastic blocks of the same size are used instead of the components.

[0083] Take the glass substrates to be assembled in each of the above examples and comparative examples. Coat the assembly areas of these glasses with the adhesive epoxy resin. Align the polycarbonate plastic blocks of the same size with the areas coated with the adhesive, gently press to remove air bubbles, and make the adhesive evenly distributed on the bonding interface. Put the bonded samples into an oven, cure at a temperature of 80 °C for 2 hours, and conduct an adhesion strength test on a universal testing machine (MTS CMT4104). Calculate the adhesion strength, and the test results are shown in Table 1.

[0084] Table 1 Results of the adhesion performance test of the glass to be assembled in each example and comparative example

[0085] Sample Bonding strength (MPa) Yield rate % Example 1 3.27 96.2 Example 2 3.58 95.5 Example 3 5.19 95.6 Example 4 5.22 96.7 Comparative Example 1 1.89 88.3 Comparative Example 2 2.43 95.8 Comparative Example 3 2.79 96.1 Comparative Example 4 2.63 95.4

[0086] As can be seen from Table 1, in Examples 1 - 4, appropriate types and proportions of stearates are added to the hydrocolloid. These stearates improve the fluidity of the hydrocolloid, and the accuracy of the hydrocolloid screen-printed on the glass cover plate is as high as 0.01 mm, which is much higher than the accuracy of the screen-printed ink removed by laser engraving in the prior art. Especially in Examples 3 and 4, the addition of the silane coupling agent further reduces the internal friction of the hydrocolloid. When printing on the glass cover plate, its printing edge is very flat, the edge protection effect is good, and the components in the assembly area are not easily detached. In Comparative Examples 1 - 4, a smooth and continuous lubricating layer is not formed, resulting in poor fluidity of the hydrocolloid and making the plastic blocks tested in the assembly area more likely to fall off.

[0087] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A method for shielding the assembly area of ​​a glass substrate coated with an AF film, characterized in that: The steps include: S1, screen printing the modified hydrosol on the assembly area of ​​the glass substrate and curing it; S2, coating an AF film layer on the surface of the glass substrate after the hydrosol is screen-printed in step S1; S3, removing the modified hydrosol in the glass substrate assembly area in step S2.

2. The method for shielding the assembly area of ​​a glass substrate coated with an AF film according to claim 1, characterized in that: In step S1, the modified hydrosol comprises the following raw materials in parts by weight: 5-15 parts of deionized water, 30-60 parts of plasticizer, 0.3-0.8 parts of zinc stearate, 0.3-0.8 parts of calcium stearate, 0.3-0.8 parts of magnesium stearate, and 40-70 parts of PVC paste resin.

3. The method for shielding the assembly area of ​​the glass substrate coated with AF film according to claim 2, characterized in that: The modified hydrosol is prepared by the following steps: mixing the raw materials in the order of deionized water, plasticizer, zinc stearate, calcium stearate, magnesium stearate and PVC paste resin; Preferably, the mixing temperature is 50-70°C; Preferably, the mixing method is stirring, and the stirring speed is 100-600r / min.

4. The method for shielding the assembly area of ​​the glass substrate coated with AF film according to claim 3, characterized in that: The preparation of the modified hydrosol also includes condensing zinc stearate, calcium stearate and magnesium stearate with a silane coupling agent; Preferably, the condensation reaction is carried out by hydrolyzing the silane coupling agent and then carrying out a condensation reaction with zinc stearate, calcium stearate and magnesium stearate.

5. The method for shielding the assembly area of ​​the glass substrate coated with AF film according to any one of claims 1 to 4, characterized in that: In step 1, the thickness of the modified hydrosol screen-printed on the assembly area is 8-100 μm, the curing temperature of the modified hydrosol is 60-100° C., and the curing time is 20-50 min.

6. The method for shielding the assembly area of ​​a glass substrate coated with an AF film according to any one of claims 1 to 5, characterized in that: In step S2, the thickness of the AF film layer on the glass substrate is 5-80 μm.

7. The method for shielding the assembly area of ​​a glass substrate coated with an AF film according to any one of claims 1 to 6, characterized in that: In step S3, the hydrosol in the assembly area is removed by a brush-type cleaning machine, and the brush-type cleaning machine requires a cleaning medium of 40-60° C. to remove the hydrosol.

8. The method for shielding the assembly area of ​​a glass substrate coated with an AF film according to claim 7, characterized in that: The cleaning medium is one of a neutral detergent, ethanol or isopropanol aqueous solution; Preferably, the cleaning medium is an aqueous solution of a neutral cleaning agent; Preferably, the cleaning time is 2-20 min.

9. Application of a method for shielding the assembly area of ​​a glass substrate coated with an AF film in a mobile phone glass back cover.

10. Application of the method for shielding the assembly area of ​​a glass substrate coated with an AF film according to claim 9 in a mobile phone glass back cover, characterized in that: The mobile phone glass cover plate is one of a glossy surface, an AG surface or a glossy matte surface; Preferably, the thickness of the mobile phone glass back cover is 0.1-2 mm.

Images