Repair method of anti-fingerprint coating

Abstract

A method for repairing an anti-fingerprint coating comprises: providing a substrate to be repaired, the substrate comprising a substrate and an anti-fingerprint coating located on a surface of the substrate, the surface of the anti-fingerprint coating facing away from the substrate having a damaged area, the anti-fingerprint coating containing silicon-oxygen bonds; first coating the damaged area with hydrobromic acid, and then coating the damaged area coated with hydrobromic acid with a repair liquid containing an alkoxysilane polymer containing silicon-oxygen bonds; irradiating the damaged area with a laser so that the hydrobromic acid catalyzes the breaking of silicon-oxygen bonds in the anti-fingerprint coating and the breaking of silicon-oxygen bonds in the alkoxysilane polymer under the irradiation of the laser, and the silicon-oxygen bonds in the anti-fingerprint coating after the breaking are combined with the silicon-oxygen bonds in the alkoxysilane polymer after the breaking, so that the repair liquid repairs the damaged area.

Description

Technical Field

[0001] The present application relates to the technical field of coating repair, and in particular to a method for repairing an anti-fingerprint coating. Background Art

[0002] Consumer electronics typically use glass displays. To improve display performance, an anti-fingerprint coating (AF coating) is often applied to the substrate to prevent fingerprints from affecting the display. However, if the AF coating is damaged, the glossiness of the coating will become inconsistent under light, resulting in discoloration on the glass display. Summary of the Invention

[0003] In view of the above situation, the present application provides a method for repairing an anti-fingerprint coating to solve the problem of discoloration of a glass display screen.

[0004] A method for repairing an anti-fingerprint coating comprises: providing a substrate to be repaired, the substrate comprising a substrate and an anti-fingerprint coating located on a surface of the substrate, the surface of the anti-fingerprint coating facing away from the substrate having a damaged area, the anti-fingerprint coating containing silicon-oxygen bonds; first coating the damaged area with hydrobromic acid, and then coating the damaged area coated with hydrobromic acid with a repair liquid containing an alkoxysilane polymer containing silicon-oxygen bonds; irradiating the damaged area with a laser so that the hydrobromic acid catalyzes the breaking of silicon-oxygen bonds in the anti-fingerprint coating and the breaking of silicon-oxygen bonds in the alkoxysilane polymer under the irradiation of the laser, and the silicon-oxygen bonds in the anti-fingerprint coating after the breaking are combined with the silicon-oxygen bonds in the alkoxysilane polymer after the breaking, so that the repair liquid repairs the damaged area.

[0005] In some embodiments of the present application, the repair fluid further includes titanium dioxide particles, and the titanium dioxide particles are dispersed in the repair fluid.

[0006] In some embodiments of the present application, a coupling agent is connected to the surface of the titanium dioxide particles.

[0007] In some embodiments of the present application, before the steps of first coating the damaged area with hydrobromic acid and then coating the damaged area coated with a repair liquid, the repair method further comprises: scanning the anti-fingerprint coating with a scanning non-contact flatness meter to determine the damaged area.

[0008] In some embodiments of the present application, the step of scanning the anti-fingerprint coating with a scanning non-contact flatness meter further includes: measuring the height difference between the surface of the damaged area and the undamaged surface of the anti-fingerprint coating, and determining the coating amount of hydrobromic acid and the coating amount of the repair liquid based on the height difference.

[0009] In some embodiments of the present application, in the step of irradiating the damaged area with laser, the power of the laser is 0.2 kW-0.3 kW.

[0010] In some embodiments of the present application, in the step of irradiating the damaged area with laser, the scanning rate during laser irradiation is 50 mm / s-70 mm / s.

[0011] In some embodiments of the present application, in the step of irradiating the damaged area with laser, the laser is a pulsed laser.

[0012] In some embodiments of the present application, after the step of irradiating the damaged area with laser, the repair method further includes standing to allow the repair liquid to solidify.

[0013] In some embodiments of the present application, the repair fluid further includes a solvent and a silane coupling agent.

[0014] The anti-fingerprint coating repair method provided in the embodiments of the present application sequentially applies hydrobromic acid and a repair fluid to the damaged area, and then irradiates the damaged area with a laser to form a repair coating that effectively bonds with the anti-fingerprint coating. The hydrobromic acid acts as an electron transfer medium, promoting the breakage of silicon-oxygen bonds in the anti-fingerprint coating and reducing the laser energy required for bond scission. After the silicon-oxygen bonds in the anti-fingerprint coating break, they re-bond with the alkoxysilane in the repair fluid, forming a stable structure and improving optical heterochromia. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Flowchart of the anti-fingerprint coating repair method provided in an embodiment of the present application.

[0016] Figure 2 A schematic structural diagram of a method for repairing an anti-fingerprint coating provided in an embodiment of the present application.

[0017] Figure 3 This is a schematic diagram of the structure of titanium dioxide particles provided in the examples of the present application before and after modification by a coupling agent.

[0018] Description of main component symbols

[0019] Substrate to be repaired 10 substrate 12 Anti-fingerprint coating 14 damaged area 16 hydrobromic acid 20 Repair fluid 25 laser 30 Repair coating 40 DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned objects, 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. The embodiments described are only a part of the embodiments of the present application, rather than all of the embodiments.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes all and any combinations of one or more of the associated listed items.

[0022] See also Figure 1 as well as Figure 2 The present invention provides a method for repairing an anti-fingerprint coating 14, comprising the following steps:

[0023] Step S1: providing a substrate 10 to be repaired. The substrate 10 to be repaired includes a substrate 12 and an anti-fingerprint coating 14 located on a surface of the substrate 12. The surface of the anti-fingerprint coating 14 facing away from the substrate 12 has a damaged area 16. The anti-fingerprint coating 14 contains silicon-oxygen bonds.

[0024] The anti-fingerprint coating 14 is typically a coating containing silicon-oxygen bonds formed on the surface of the substrate 12 after an anti-fingerprint liquid containing reactive silane groups reacts with fluorine-modified organic groups. The thickness of the anti-fingerprint coating 14 can range from 10 nm to 20 nm. In some embodiments, the substrate 12 can be a glass substrate, a metal substrate, a plastic substrate, or a ceramic substrate.

[0025] When the anti-fingerprint coating 14 is damaged, the surface glossiness of the anti-fingerprint coating 14 is inconsistent, resulting in a discoloration problem.

[0026] Step S2 : Scanning the anti-fingerprint coating 14 with a scanning non-contact flatness meter to determine the damaged area 16 .

[0027] In some embodiments, a laser interferometer can be used to scan the entire surface of the substrate 10 to be repaired by emitting a single-frequency light beam. After the light beam enters the linear interferometer, it is split into two beams and directed to the reflector. The two beams are then reflected back to the beam splitter, and after reflection, they are reconverged and returned to the laser interferometer. If the optical path difference does not change, a stable signal will be found between the two poles of constructive and destructive interference; if the optical path difference changes, these changes are calculated and used to measure the difference between the two optical paths. The flatness of the substrate 10 to be repaired is detected by the laser interferometer, the damaged area 16 is found, and the difference between the damaged area 16 and the surface is analyzed to facilitate subsequent repair.

[0028] When the damaged area 16 is small and of varying depths, it is difficult to detect with the naked eye. The laser scanning method can be used to find the damaged area 16, thereby achieving fully automated detection and repair. In other embodiments, the method for finding the damaged area 16 is not limited to the method described above.

[0029] The step of scanning the anti-fingerprint coating 14 using a scanning non-contact flatness meter further includes: measuring the height difference between the surface of the damaged area 16 and the undamaged surface of the anti-fingerprint coating 14, and determining the coating amount of hydrobromic acid 20 and the coating amount of the repair fluid 25 based on the height difference.

[0030] Step S3: first apply hydrobromic acid 20 to the damaged area 16, and then apply a repairing liquid 25 to the damaged area 16 coated with hydrobromic acid. The repairing liquid 25 contains an alkoxysilane polymer, which contains a silicon-oxygen bond.

[0031] The hydrobromic acid 20 must at least cover the damaged area 16. Under certain conditions, the alkoxysilane polymer in the repair fluid 25 can undergo a polymerization reaction, thereby forming a transparent repair coating 40. In this embodiment, the alkoxysilane polymer in the repair fluid 25 is a perfluoropolyether alkoxysilane. The repair fluid 25 also contains a solvent, which is a hydrofluoroether. The repair fluid 25 also includes a silane coupling agent, which can catalyze bonding.

[0032] Step S4: Using a laser 30 to irradiate the damaged area 16, so that the hydrobromic acid 20 catalyzes the breaking of the silicon-oxygen bonds in the anti-fingerprint coating 14 under the irradiation of the laser, and the silicon-oxygen bonds in the anti-fingerprint coating 14 after the breaking are combined with the silicon-oxygen bonds in the alkoxysilane polymer after the breaking, so that the repair liquid repairs the damaged area 16.

[0033] The silicon-oxygen bonds in the anti-fingerprint coating 14 are covalently bonded. During laser treatment, the laser can more precisely heat the damaged area 16, weakening the bonding between the silicon-oxygen bonds. Because bromide ions have a greater electronegativity than oxygen, the bromide ions released by hydrobromic acid 20 approach the silicon-oxygen bonds and more easily attract electrons from them, causing the bonds to break. After the bonds break, they re-bond with the alkoxysilane in the repair fluid 25 to form new silicon-oxygen bonds, thus forming a complete bond between the repair coating 40 and the anti-fingerprint coating 14. During the laser treatment, the hydrobromic acid 20 acts as an electron transfer medium, promoting the breaking of the silicon-oxygen bonds. Only a small amount of laser energy 30 is required to break the silicon-oxygen bonds. The hydrogen ions in the hydrobromic acid 20 create a slightly acidic reaction system, allowing the bromide ions to be better solvated through hydrogen bonds, increasing their redox potential and enhancing the depolymerization of the silicon-oxygen bonds. After the silicon-oxygen bond is broken, the stability of the bond with the bromide ion is weak, and the laser treatment time is short, so the bromide ion usually does not exist in the repaired coating structure.

[0034] The parameters during laser treatment must at least ensure that the substrate 12 is not melted by the energy of the laser 30. In some embodiments, during the step of irradiating the damaged area 16 with laser, the laser power may be 0.2 kW to 0.3 kW, and the scanning rate during laser irradiation may be 50 mm / s to 70 mm / s.

[0035] The laser may be a pulsed laser, which can emit strong energy in a shorter period of time and has a small thermal effect. It can reduce the impact of the laser on the anti-fingerprint coating 14 outside the damaged area on the basis of rearranging the silicon-oxygen bonds in the damaged area 16.

[0036] After the damaged area 16 is irradiated with laser, it is left to stand for a period of time, which may be 5 minutes to 10 minutes, until the repair coating 40 is cured to form the repair coating 40 bonded to the anti-fingerprint coating 14 .

[0037] In some embodiments, the repair fluid 25 further includes titanium dioxide particles, which are dispersed in the repair fluid 25 in the form of nanoparticles. Titanium dioxide particles have high transparency and a high refractive index, which can increase the refractive index of the repair coating 40. The titanium dioxide particles also make the repair coating 40 reflect light uniformly, eliminating the problem of optical discoloration observed from specific angles, thereby improving optical interference issues in the damaged area 16.

[0038] See also Figure 3 In some embodiments, a coupling agent is attached to the surface of the titanium dioxide particles. The coupling agent is used to passivate the surface of the titanium dioxide particles and improve the dispersibility of the modified titanium dioxide particles in the repair fluid 25. In the repair coating 40 formed after repair, the titanium dioxide particles can be evenly dispersed in the repair coating 40. In one specific embodiment, the titanium dioxide particles are modified using a zirconate coupling agent.

[0039] Comparative Example 1

[0040] A substrate 10 to be repaired is provided, and a repairing liquid 25 is applied to a damaged area 16. Upon inspection of the damaged area 16, it is found that the damaged area 16 cannot be repaired, and the repairing liquid 25 can only be temporarily applied to the surface of the substrate 10 to be repaired.

[0041] Comparative Example 2

[0042] A substrate 10 to be repaired is provided, and a repair fluid 25 is applied to a damaged area 16. Laser 30 is then used to irradiate the damaged area 16 to induce a chemical reaction in the repair fluid 25. Inspection of the damaged area 16 reveals poor adhesion between the anti-fingerprint coating 14 and the repair coating 40, resulting in optical discoloration.

[0043] Example 1

[0044] A substrate 10 to be repaired was provided. Hydrobromic acid 20 and a repair fluid 25 containing perfluoropolyether alkoxysilane, a silane coupling agent, and a hydrofluoroether were applied to the damaged area 16. Laser 30 was then used to irradiate the damaged area 16, causing the repair fluid 25 to react and form a repair coating 40. Inspection of the damaged area 16 revealed that the damaged area 16 had been completely repaired, with minor optical discoloration observed at certain angles.

[0045] Example 2

[0046] A substrate 10 to be repaired was provided. Hydrobromic acid 20 and a repair fluid 25 were applied to the damaged area 16. The repair fluid 25 contained perfluoropolyether alkoxysilane, a silane coupling agent, a hydrofluoroether, and titanium dioxide particles modified with a zirconate coupling agent. Laser 30 was then used to irradiate the damaged area 16, causing the repair fluid 25 to react and form a repair coating 40. Testing of the damaged area 16 revealed that the damaged area 16 was completely repaired, with no optical discoloration.

[0047] Please refer to Table 1, which is a summary of some processing conditions and test results in Comparative Examples 1 and 2 and Examples 1 and 2.

[0048] Table 1

[0049]

[0050]

[0051] It can be seen from Comparative Example 1 in Table 1 that: Comparative Example 1 only uses the repair liquid 25 for coating, and the repair liquid 25 is difficult to react with the anti-fingerprint coating 14, and can only be temporarily coated on the surface of the anti-fingerprint coating 14. It can be seen from Comparative Example 2 that: the repair liquid 25 is irradiated with the laser 30, and the repair liquid 25 can react by itself to form the repair coating 40, but because the silicon-oxygen bond in the anti-fingerprint coating 14 is difficult to depolymerize under the above-mentioned laser irradiation conditions, the repair coating 40 and the anti-fingerprint coating 14 are two independent layers of structure, the bonding performance between the two coatings is poor, and there is an interface between the two coatings, resulting in optical heterochromia; or increasing the energy of the laser treatment (for example, increasing the power of the laser, extending the time of the laser treatment), may cause the substrate 12 to melt. It can be seen from Example 1 that by using the solution of combining hydrobromic acid 20 and laser treatment, the damaged area 16 is completely repaired, and a stably bonded repair coating 40 and anti-fingerprint coating 14 are formed. It can be seen from Example 2 that adding zirconate coupling agent to modify TiO2 in the repair liquid 25 can improve the dispersibility of the modified titanium dioxide particles in the repair liquid 25. In the repair coating 40 formed after repair, the titanium dioxide particles can be evenly dispersed in the repair coating 40, so that the anti-fingerprint coating 14 has no optical discoloration after repair.

[0052] The repair method for the anti-fingerprint coating 14 provided in the embodiments of the present application sequentially coats the damaged area 16 with hydrobromic acid 20 and a repair fluid 25, then irradiates the damaged area 16 with a laser 30, thereby forming a repair coating 40 that effectively bonds with the anti-fingerprint coating 14. The hydrobromic acid 20 acts as an electron transfer medium, promoting the breakage of silicon-oxygen bonds in the anti-fingerprint coating 14 and reducing the laser energy required for bond scission. After the silicon-oxygen bonds in the anti-fingerprint coating 14 break, they re-bond with the alkoxysilane in the repair fluid 25, forming a stable structure and improving optical color shift.

[0053] The above embodiments 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 embodiments, those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present application should not depart from the spirit and scope of the technical solutions of the present application.

Claims

1. A method for repairing an anti-fingerprint coating, comprising: Providing a substrate to be repaired, the substrate to be repaired comprising a substrate and an anti-fingerprint coating located on a surface of the substrate, wherein a surface of the anti-fingerprint coating facing away from the substrate has a damaged area, and the anti-fingerprint coating contains silicon-oxygen bonds; First, apply hydrobromic acid to the damaged area, and then apply a repair liquid to the damaged area coated with the hydrobromic acid, wherein the repair liquid contains an alkoxysilane polymer, and the alkoxysilane polymer contains a silicon-oxygen bond; and Laser is used to irradiate the damaged area, so that the hydrobromic acid catalyzes the scission of the silanol bonds in the anti-fingerprint coating and the scission of the silanol bonds in the alkoxysilane polymer under the irradiation of the laser, and the scission of the silanol bonds in the anti-fingerprint coating and the scission of the alkoxysilane polymer are combined, so that the repair liquid repairs the damaged area.

2. The method for repairing the anti-fingerprint coating according to claim 1, wherein: The repair liquid also includes titanium dioxide particles, which are dispersed in the repair liquid.

3. The method for repairing the anti-fingerprint coating according to claim 2, wherein: The surfaces of the titanium dioxide particles are connected with a coupling agent.

4. The method for repairing an anti-fingerprint coating according to claim 1, wherein: Before the steps of first coating the damaged area with hydrobromic acid and then coating the damaged area with repair liquid after coating the hydrobromic acid, the repair method further comprises: scanning the anti-fingerprint coating with a scanning non-contact flatness meter to determine the damaged area.

5. The method for repairing the anti-fingerprint coating according to claim 4, wherein: The step of scanning the anti-fingerprint coating using a scanning non-contact flatness meter further includes: measuring a height difference between the surface of the damaged area and the undamaged surface of the anti-fingerprint coating, and determining the coating amount of the hydrobromic acid and the coating amount of the repair liquid based on the height difference.

6. The method for repairing an anti-fingerprint coating according to claim 1, wherein: In the step of irradiating the damaged area with laser, the power of the laser is 0.2kW-0.3kW.

7. The method for repairing an anti-fingerprint coating according to claim 1, wherein: In the step of irradiating the damaged area with laser, the scanning rate of the laser irradiation is 50 mm / s-70 mm / s.

8. The method for repairing an anti-fingerprint coating according to claim 1, wherein: In the step of irradiating the damaged area with laser, the laser is a pulsed laser.

9. The method for repairing an anti-fingerprint coating according to claim 1, wherein: After the step of irradiating the damaged area with laser, the repair method further includes standing to allow the repair liquid to solidify.

10. The method for repairing an anti-fingerprint coating according to claim 1, wherein: The repairing liquid also includes a solvent and a silane coupling agent.

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