Coating protection method

Abstract

A coating protection method comprises providing a substrate, wherein the substrate comprises a main body and a coating arranged on the surface of the main body; rubbing the surface of the substrate provided with the coating so that the substrate carries positive charge; coating the surface of the substrate provided with the coating with a protective liquid, wherein the protective liquid contains an anionic surfactant, wherein the positive charge and the anionic surfactant attract each other so that the protective liquid is adsorbed on the surface of the substrate and covers the coating; and allowing the substrate coated with the protective liquid to stand so that the protective liquid forms a protective layer covering the surface of the coating to protect the coating.

Description

Technical Field

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

[0002] During the glass assembly process, a protective film is usually attached to the surface of the glass to prevent the glass from being hit, damaged, etc. After the assembly is completed, the film is removed. The surface of the glass is usually provided with a functional coating. When the film is removed, the coating on the surface of the glass is easily removed, resulting in different colors between the area without the film and the area with the film. Summary of the invention

[0003] In view of this, it is necessary to provide a coating protection method to solve the above problems.

[0004] A coating protection method comprises providing a substrate, wherein the substrate comprises a main body and a coating arranged on the surface of the main body; rubbing the surface of the substrate provided with the coating so that the substrate carries positive charge; coating the surface of the substrate provided with the coating with a protective liquid, wherein the protective liquid contains an anionic surfactant, wherein the positive charge and the anionic surfactant attract each other so that the protective liquid is adsorbed on the surface of the substrate and covers the coating; and allowing the substrate coated with the protective liquid to stand so that the protective liquid forms a protective layer covering the surface of the coating to protect the coating.

[0005] In some embodiments of the present application, the step of "rubbing the surface of a substrate provided with a coating" includes: treating the surface of the substrate with a friction object, wherein the material of the friction object is selected from one of nylon, polybutylene terephthalate (PBT), polypropylene, polyethylene terephthalate and polyvinyl chloride.

[0006] In some embodiments of the present application, the friction object is at least one brush, the protective liquid is partially sprayed onto the at least one brush, and the at least one brush rolls to treat the surface of the substrate so that the surface of the substrate carries a positive charge and the protective liquid is coated on the surface of the substrate.

[0007] In some embodiments of the present application, the rotation speed of the brush ranges from 2000r / min to 8000r / min, the travel speed of the spraying protective liquid ranges from 50mm / s to 150mm / s, and the pressure range when the brush rubs against the substrate is 5N-30N.

[0008] In some embodiments of the present application, the anionic surfactant includes at least one of sodium dodecylbenzene sulfonate, hexafluoropropylene trimer or polyacrylamide.

[0009] In some embodiments of the present application, the protective liquid further includes a nonionic surfactant and a solvent, and the anionic surfactant and the nonionic surfactant are dissolved in the solvent.

[0010] In some embodiments of the present application, the nonionic surfactant includes at least one of fatty alcohol polyoxyethylene ether and ethoxy nonafluorobutane.

[0011] In some embodiments of the present application, the solvent includes isopropyl alcohol.

[0012] In some embodiments of the present application, the protective liquid further includes an auxiliary agent, and the auxiliary agent includes at least one of ethyl acetate and sodium chloride.

[0013] In some embodiments of the present application, the standing time ranges from 1 min to 3 min.

[0014] The coating protection method provided in the embodiment of the present application treats the substrate so that the substrate carries a positive charge, and attracts a protective liquid containing a negative ion surfactant through electrostatic attraction to form a temporary protective layer covering the coating on the surface of the substrate provided with the coating, thereby protecting the coating and preventing the coating from being removed during subsequent processing of the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A cross-sectional schematic diagram of a glass surface in which a coating is removed from a portion of the glass surface provided in the related art.

[0016] Figure 2 A flow chart of a coating protection method provided in an embodiment of the present application.

[0017] Figure 3 A schematic diagram of a substrate cross-section process flow of a coating protection method provided in an embodiment of the present application.

[0018] Figure 4 The present invention is a schematic diagram of a cross-sectional process of a substrate for performing film lamination treatment on a substrate provided with a protective layer.

[0019] Main component symbols

[0020] Matrix 10 Ontology 11 coating 13、13’ Protective fluid 20 Protective layer 25 Friction 30 nozzle 31 Film 40、40’ Glass 50’ Area without film layer A Area covered with film B DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth to facilitate a full understanding of the present application, and the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this article are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0023] See also Figure 1 In some related technologies, during the assembly process of the glass 50' with other components, a film layer 40' needs to be attached to the surface of the glass 50' to prevent the glass 50' from being scratched or crushed during the assembly process. After the assembly is completed, the film layer 40' is torn off. The surface of the glass 50' is usually provided with a coating 13'. During the process of tearing off the film layer 40', the coating 13' adheres to the film layer 40' and is removed together. The surface of the glass 50' will lose or reduce the corresponding function. At the same time, the color of the glass 50' will be different between the area A without the film layer and the area B with the film layer, that is, the glass 50' will have a different color. The embodiment of the present application provides a coating protection method to protect the coating 13'.

[0024] See also Figures 2 to 3 The present invention provides a coating protection method, which may include the following steps:

[0025] Step S1 : providing a substrate 10 , wherein the substrate 10 comprises a body 11 and a coating 13 disposed on a surface of the body 11 .

[0026] In some embodiments, the substrate 10 is used to assemble into a terminal device, which may be a mobile phone, a tablet computer, a camera, etc. The material of the body 11 may be glass, plastic, etc. This embodiment takes the body material of glass as an example for explanation, and the coating 13 is disposed on the surface of the body 11, and the coating 13 may be an anti-fingerprint coating. In the process of assembling the substrate 10 into a terminal device, the surface of the substrate 10 needs to be covered with a film layer 40 to prevent the surface of the substrate 10 from being damaged during the assembly process.

[0027] The surface of the body 11 has a certain degree of roughness, and the coating 13 is carried on the surface of the body 11. The substrate 10 may also be loaded with dirt, such as oil, which may be carbonized after heating, causing the surface of the substrate 10 to appear discolored.

[0028] Step S2: rubbing the surface of the substrate 10 provided with the coating 13 so that the substrate 10 carries positive charges.

[0029] In some embodiments, the friction object 30 can be used to rub the surface of the substrate 10. During the treatment process using the friction object 30, the principle of friction electrification can be used to make the substrate 10 carry positive charges. In some embodiments, the friction object 30 is at least one brush, and the brush can be used to quickly rotate and rub the surface of the substrate 10 provided with the coating 13, so as to set the substrate 10 to carry positive charges.

[0030] The material of the friction object 30 is selected from one of nylon, polybutylene terephthalate (PBT), polypropylene (PP), polyethylene terephthalate (PET) and polyvinyl chloride (PVC). In some embodiments, the material of the friction object 30 can be nylon.

[0031] In some embodiments, the rubbing may be performed manually or with mechanical assistance.

[0032] Step S3: coating the surface of the substrate 10 with the coating 13 with a protective liquid 20 , wherein the protective liquid 20 contains an anionic surfactant, and the positive charge and the anionic surfactant attract each other, so that the protective liquid 20 is adsorbed on the surface of the substrate 10 , and the protective liquid 20 covers the coating 13 .

[0033] The anionic surfactant may be selected from at least one of sodium dodecylbenzene sulfonate, hexafluoropropylene trimer or polyacrylamide. The anionic surfactant carries a negative charge, so that the protective liquid 20 can attract the substrate 10 carrying a positive charge, thereby forming a temporary protective layer 25 on the surface of the substrate 10.

[0034] In some embodiments, the protective liquid 20 may be partially sprayed onto at least one brush, and the at least one brush may be rotated and rubbed to process the surface of the substrate 10, so that the surface of the substrate 10 carries positive charges and the protective liquid 20 is coated on the surface of the substrate 10. This is equivalent to using a brush rolling process, which can simultaneously cause the surface of the substrate 10 to carry positive charges and coat the protective liquid 20 on the surface of the substrate 10.

[0035] In a specific embodiment, two brushes are used for rolling treatment. The two brushes are parallel to each other and rotate in opposite directions. The two brushes cooperate with each other to compensate for the dead corners of the substrate 10, especially for substrates 10 with irregular shapes (for example, those with bosses), so that the protective liquid 20 is evenly coated on the surface of the substrate 10.

[0036] In some embodiments, the rotation speed of the brush can range from 2000r / min to 8000r / min, which is conducive to making the surface of the substrate 10 carry a certain amount of positive charge; the travel speed of the spraying protective liquid 20 can range from 50mm / s to 150mm / s, which is conducive to the substrate 10 attracting a certain amount of protective liquid 20, and can reduce or prevent the substrate 10 from being scratched by the brush. The pressure range when the brush and the substrate 10 are rubbed can be 5N-30N. The test method can use a thin film piezoelectric sensor to place it under the brush, determine the position of the brush when the sensed pressure is within the range, and place the substrate 10 at the same position. The test instrument in this application uses a flexible thin film pressure sensor model MY2801 of Suzhou Nengsda Electronic Technology Co., Ltd. to detect the display module.

[0037] In some embodiments, the surface of the substrate 10 may be treated with the friction material 30 to make the surface of the substrate 10 carry positive charges, and then the protective liquid 20 may be coated on the surface of the substrate 10 .

[0038] Step S4 : leaving the substrate 10 coated with the protection liquid 20 to stand, so that the protection liquid 20 forms a protection layer 25 covering the surface of the coating layer 13 to protect the coating layer 13 .

[0039] During the static process, the liquid protective liquid 20 forms a solid protective layer 25. The protective layer 25 is temporarily adsorbed on the surface of the substrate 10, and the protective layer 25 can be removed after the substrate 10 completes the subsequent processing steps.

[0040] The standing time may range from 1 min to 3 min, which is beneficial for the volatilization of the solvent to form the protective layer 25 , and can also reduce the process time and improve the process efficiency.

[0041] Please also read Figure 4 In a specific embodiment, after the temporary protective layer 25 is adsorbed on the surface of the substrate 10, a film layer 40 is bonded to the surface of the substrate 10 provided with the protective layer 25, and the installation of the substrate 10 is completed. After the installation of the substrate 10 is completed, the film layer 40 is removed. The force of the film layer 40 bonding the protective layer 25 is greater than the electrostatic attraction of the substrate 10 to the protective layer 25. In the process of removing the film layer 40, the protective layer 25 is separated from the substrate 10, thereby preventing the coating 13 located on the surface of the body 11 from being bonded by the film layer 40 and being removed, thereby achieving the purpose of protecting the coating 13.

[0042] The protective liquid 20 may also include a nonionic surfactant and a solvent, and the anionic surfactant and the nonionic surfactant are dissolved in the solvent. The nonionic surfactant includes at least one of fatty alcohol polyoxyethylene ether and ethoxy nonafluorobutane. The nonionic surfactant can be used to improve the solubility of the anionic surfactant on the one hand, and can be used to dissolve dirt on the surface of the body 11 on the other hand. The solvent includes isopropanol, which has good volatility and is conducive to the rapid volatilization of the subsequent solvent, thereby quickly forming a protective layer 25 on the surface of the substrate 10.

[0043] The protective liquid 20 may also include an auxiliary agent, which includes at least one of ethyl acetate and sodium chloride. Ethyl acetate is used as a binder to better combine the anionic surfactant with the nonionic surfactant to further improve the solubility of the anionic surfactant. Sodium chloride is used to enhance the electronegativity of the anionic surfactant and increase the electrostatic attraction between the protective layer 25 and the substrate 10.

[0044] The protection method of the coating 13 of the present application is described below through specific examples and comparative examples, wherein each example or comparative example is tested using 40 samples.

[0045] Comparative Example 1

[0046] Use a brush to clean the surface of the substrate to remove dust from the substrate surface. Install the film layer directly on the substrate without treatment. After installation, remove the film layer and observe the color of the substrate. It is found that the area with the film layer is obviously different in color compared with the area without the film layer.

[0047] Comparative Example 2

[0048] Place a substrate on a vacuum adsorption platform, with the surface with the coating facing away from the vacuum adsorption platform. Use a brush to clean the surface of the substrate to remove dust from the substrate surface. Roll two brushes on the surface of the substrate, with the two brushes rotating in opposite directions at a speed of 5000r / min, so that the surface of the substrate carries a positive charge due to friction, and let it stand for 1 minute. After the film layer is attached to the surface of the substrate, install it. After the installation is completed, tear off the film layer and observe the color of the substrate. It is found that the area with the film layer attached has obvious different colors compared with the area without the film layer.

[0049] Example 1

[0050] Place a substrate on a vacuum adsorption platform, with the surface with the coating facing away from the vacuum adsorption platform. Use a nylon brush to clean the surface of the substrate, which can be used to remove dust on the surface of the substrate. Use a nozzle to spray the protective liquid toward the brush and the surface of the substrate, and the brush rolls on the surface of the substrate. The travel speed of the nozzle is 90mm / s, the spray valve pressure of the nozzle is 1.5kPa, and the speed of the brush is 5000r / min. Repeat the above steps 4 times, and spray a total of 3mL of protective liquid. The rolling of the brush on the surface of the substrate causes the surface of the substrate to carry positive charges due to friction, thereby adsorbing the protective liquid containing anionic surfactants through electrostatic force. Let it stand for 1 minute to allow the protective liquid to form a protective layer.

[0051] After the film layer is attached to the surface of the substrate, the substrate is assembled with other components (not shown). After the assembly is completed, the film layer is torn off to observe the color difference between the area of ​​the substrate where the film layer is attached and the area where the film layer is not attached.

[0052] Example 2

[0053] The difference from Example 1 is that the amount of the sprayed protective liquid in Example 2 is 8 mL.

[0054] Example 3

[0055] The difference from Example 1 is that the amount of the sprayed protective liquid in Example 3 is 13 mL.

[0056] Example 4

[0057] The difference from Example 1 is that the amount of the sprayed protective liquid in Example 4 is 18 mL.

[0058] Example 5

[0059] The difference from Example 1 is that the amount of the sprayed protective liquid in Example 5 is 13 mL.

[0060] Example 6

[0061] The difference from Example 1 is that in Example 6, the amount of the protective liquid sprayed is 8 mL, and the travel speed of the nozzle is 50 mm / s.

[0062] Example 7

[0063] The difference from Example 6 is that in Example 7, the amount of the sprayed protective liquid is 8 mL, and the travel speed of the nozzle is 70 mm / s.

[0064] Example 8

[0065] The difference from Example 6 is that the travel speed of the nozzle in Example 8 is 90 mm / s.

[0066] Example 9

[0067] The difference from Example 6 is that the travel speed of the nozzle in Example 9 is 110 mm / s.

[0068] Example 10

[0069] The difference from Example 6 is that the travel speed of the nozzle in Example 10 is 130 mm / s.

[0070] Embodiment 11

[0071] The difference from Example 6 is that Example 11 uses manual application of the protective liquid.

[0072] Example 12

[0073] The difference from Example 1 is that in Example 12, the amount of sprayed protective liquid is 8 mL, and the rotation speed of the brush is 3000 r / min.

[0074] Embodiment 13

[0075] The difference from Example 12 is that the rotation speed of the brush in Example 13 is 4000 r / min.

[0076] Embodiment 14

[0077] The difference from Example 12 is that the rotation speed of the brush in Example 14 is 5000 r / min.

[0078] Embodiment 15

[0079] The difference from Example 12 is that the rotation speed of the brush in Example 15 is 6000 r / min.

[0080] Example 16

[0081] The difference from Example 12 is that the rotation speed of the brush in Example 15 is 7000 r / min.

[0082] Embodiment 17

[0083] The difference from Example 1 is that the amount of sprayed protective liquid in Example 17 is 8 mL.

[0084] Embodiment 18

[0085] The difference from Example 17 is that the material of the brush in Example 18 is PBT.

[0086] Embodiment 19

[0087] The difference from Example 17 is that the material of the brush in Example 19 is PP.

[0088] Embodiment 20

[0089] The difference from Example 17 is that the material of the brush in Example 20 is PET.

[0090] Embodiment 21

[0091] The difference from Example 17 is that the material of the brush in Example 21 is PVC.

[0092] Please refer to Table 1, which is a summary of some conditions and test results in Comparative Examples 1-2 and Examples 1-21. Among them, "obvious color difference" in Table 1 means that when the substrate is visually viewed horizontally under normal light, obvious grayscale difference can be seen; "no heterochromatic" means that when the substrate is observed from any angle, no heterochromatic contrast can be observed between the area with the film layer and the area without the film layer; "slight heterochromatic" means that when the substrate is visually viewed horizontally under normal light, it can be seen that the grayscale of the area with the film layer and the area without the film layer is almost the same, and some contrast can be seen from an oblique angle (for example, 45°) and with specific light; "a small amount of heterochromatic" means that when the substrate is visually viewed horizontally under normal light, it can be seen that the grayscale contrast between the area with the film layer and the area without the film layer is not strong, and the contrast is strong when the heterochromatic site is illuminated by a local light source; "some heterochromatic" means that the grayscale difference can be seen horizontally under normal light. “Degree of discoloration” refers to the description of the sample with the worst degree of improvement in discoloration among the 40 samples in each embodiment or comparative example, and “yield” refers to the proportion of the number of samples with “no discoloration” in the degree of discoloration among the 40 samples in each embodiment or comparative example.

[0093] Table 1

[0094]

[0095]

[0096] By comparing Examples 1-21 with Comparative Examples 1-2, it can be seen that Examples 1-21 are all able to improve the discoloration problem, indicating that a temporary protective layer covering the coating is formed on the surface of the substrate through electrostatic attraction to prevent the coating from directly contacting the film layer and causing the coating to be removed by the film layer, thereby effectively protecting the coating, and the temporary protective layer can adhere to the film layer and can be removed together with the film layer.

[0097] It can be seen from Examples 1-5, 6-11, 12-16 and 17-21 that when the spraying amount of the protective liquid is 3mL-23mL, the travel speed of the nozzle is 50mm / s-130mm / s, the rotation speed of the friction object is 3000r / min-7000r / min, and the material of the friction object is nylon, PBT, PP, PET and PVC, the discoloration problem can be improved, which means that the problem of unexpected removal of the coating can be improved.

[0098] It can be seen from the test results of Examples 1-5 that an appropriate amount of protective liquid is required to improve the heterochromatic effect, and it is also beneficial to save the amount of protective liquid used and save costs. It can be seen from the test results of Examples 6-11 that an appropriate travel speed is conducive to uniform film formation and to improving the heterochromatic effect; among them, manual coating can also improve the heterochromatic effect. It can be seen from the test results of Examples 12-16 that an appropriate rotation speed is conducive to generating uniform positive charges on the surface of the substrate, which is beneficial to improving the heterochromatic effect. It can be seen from the test results of Examples 17-21 that brushes made of nylon, PBT, PP, PET and PVC can cause the surface of the substrate to lose electrons and generate positive charges. The anionic surfactant in the protective liquid ionizes in the solvent to generate anions, which are electronegative and generate electrostatic attraction with the positrons on the surface of the substrate, thereby forming a temporary protective layer.

[0099] The coating protection method provided in the embodiment of the present application treats the substrate so that the substrate carries a positive charge, and attracts a protective liquid containing a negative ion surfactant through electrostatic attraction to form a temporary protective layer covering the coating on the surface of the substrate provided with the coating, thereby protecting the coating and preventing the coating from being removed during subsequent processing of the substrate.

[0100] The above implementation modes are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above preferred implementation modes, a person skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A coating protection method, comprising: Providing a substrate, the substrate comprising a body and the coating disposed on a surface of the body; Using a friction object to rub the surface of the substrate provided with the coating so that the substrate carries a positive charge, the friction object is made of a material selected from one of nylon and polybutylene terephthalate, and the friction object is at least one brush; A protective liquid is applied to the surface of the substrate provided with the coating, the protective liquid is partially sprayed onto the at least one brush, the at least one brush rolls the surface of the substrate so that the surface of the substrate carries a positive charge and the protective liquid is applied to the surface of the substrate, the protective liquid contains an anionic surfactant, the positive charge and the anionic surfactant attract each other so that the protective liquid is adsorbed on the surface of the substrate, and the protective liquid covers the coating, wherein the rotation speed of the brush is in the range of 2000r / min-8000r / min, the travel speed of spraying the protective liquid is in the range of 50mm / s-150mm / s, and the pressure range of the brush and the substrate when rubbing is 5N-30N; Allowing the substrate coated with the protective liquid to stand still, so that the protective liquid forms a protective layer covering the surface of the coating to protect the coating; Bonding a film layer on the surface of the protective layer, wherein the force of bonding the film layer to the protective layer is greater than the electrostatic attraction of the substrate to the protective layer; and After the substrate is installed, the film layer is removed and the protective layer is separated from the substrate.

2. The coating protection method according to claim 1, wherein: The anionic surfactant includes at least one of sodium dodecylbenzene sulfonate, hexafluoropropylene trimer or polyacrylamide.

3. The coating protection method according to claim 1, wherein: The protective liquid also includes a nonionic surfactant and a solvent, and the anionic surfactant and the nonionic surfactant are dissolved in the solvent.

4. The coating protection method according to claim 3, wherein: The nonionic surfactant includes at least one of fatty alcohol polyoxyethylene ether and ethoxy nonafluorobutane.

5. The coating protection method according to claim 3, wherein: The solvent includes isopropyl alcohol.

6. The coating protection method according to claim 1, wherein: The protective liquid also includes an auxiliary agent, and the auxiliary agent includes at least one of ethyl acetate and sodium chloride.

7. The coating protection method according to claim 1, wherein: The standing time ranges from 1 min to 3 min.

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