A composition and method for separating a superhard coating from a surface of a transparent cover plate glass ceramic

Abstract

The application provides a composition for separating a superhard coating layer on a transparent cover plate glass ceramic surface, which comprises NaOH, KOH, NaKC4H4O6, C2H8N2 and Na5P3O 10 ; the mass percentage of NaOH is 1-5%, the mass percentage of KOH is 1-5%, the mass percentage of NaKC4H4O6 is 2-7%, the mass percentage of C2H8N2 is 1-8% and the mass percentage of Na5P3O 10 is 2-11% based on the mass of the composition. The composition of the application can erode the defect area of the superhard coating layer on the transparent cover plate glass ceramic surface, realize local separation of the defect area of the superhard coating layer and meanwhile not damage the transparent cover plate glass ceramic.

Description

Technical Field

[0001] This application relates to the field of cover glass repair technology, and in particular to a composition and method for separating an ultra-hard coating on the ceramic surface of a transparent cover glass. Background Technology

[0002] Superhard coatings, as a technology to enhance the surface hardness, scratch resistance, and impact resistance of transparent cover glass ceramics, have the following main characteristics: significantly improving the surface hardness of transparent cover glass ceramics, resisting scratches and wear during daily use of consumer electronics; enhancing the impact resistance of transparent cover glass ceramics, reducing the risk of breakage due to collisions or drops; possessing hydrophobic and oleophobic properties, reducing the adhesion of fingerprints and oil stains, keeping the surface of transparent cover glass ceramics clean; and reducing reflection and increasing light transmittance, improving the optical performance of transparent cover glass ceramics. However, the following challenges also exist: the superhard coating needs to uniformly cover the glass ceramic surface to avoid uneven thickness or bubbles; the adhesion between the superhard coating and the substrate must be strong enough to prevent peeling or cracking; and the costs of raw materials and equipment are high, resulting in low yield and high overall cost.

[0003] Existing technologies for addressing defects in ultrahard coatings include: directly scrapping the product, or removing the surface anti-fingerprint (AF) layer using plasma, and mechanically grinding the entire surface to remove the diamond-like carbon (DLC) substrate and anti-reflective (AR) layer, thereby removing the coating defects. These existing methods are relatively complex and involve high equipment and material costs.

[0004] Therefore, there is an urgent need to develop a method for separating superhard coatings that is simple in process and has low equipment and material costs. Summary of the Invention

[0005] The purpose of this application is to provide a composition and method for separating an ultra-hard coating on the surface of a transparent cover glass ceramic, so as to achieve local separation of defective areas of the ultra-hard coating without damaging the transparent cover glass ceramic. The specific technical solution is as follows:

[0006] The first aspect of this application provides a composition for separating an ultra-hard coating on a transparent cover glass-ceramic surface, comprising: NaOH, KOH, NaKC4H4O6, C2H8N2, and Na5P3O 10 Based on the mass of the composition, the mass percentage of NaOH is 1%~5%, the mass percentage of KOH is 1%~5%, the mass percentage of NaKC4H4O6 is 2%~7%, the mass percentage of C2H8N2 is 1%~8%, and the mass percentage of Na5P3O is... 10 The mass percentage content is 2%~11%.

[0007] In one embodiment of this application, based on the mass of the composition, the mass percentage of NaOH is 2%~4%, the mass percentage of KOH is 2%~4%, the mass percentage of NaKC4H4O6 is 3%~5%, the mass percentage of C2H8N2 is 3%~6%, and the mass percentage of Na5P3O is... 10 The mass percentage content is 4%~9%.

[0008] In one embodiment of this application, the composition further includes water; the water accounts for 64% to 93% of the mass of the composition.

[0009] In one embodiment of this application, the water content is 72% to 86% based on the mass of the composition.

[0010] A second aspect of this application provides a method for separating an ultra-hard coating on a transparent cover glass-ceramic surface, comprising:

[0011] Locate the defective areas of the ultra-hard coating on the glass-ceramic surface of the transparent cover plate;

[0012] The composition described in the first aspect of this application is heated and the defective area is eroded;

[0013] Polish the eroded area to separate the defective areas of the superhard coating.

[0014] In one embodiment of this application, the superhard coating is selected from diamond-like carbon coatings, silicon nitride-based coatings, or silicon carbide-based coatings.

[0015] In one embodiment of this application, the heating temperature is 85~115°C.

[0016] In one embodiment of this application, the erosion time is 30 to 150 minutes.

[0017] In one embodiment of this application, the erosion time is 45 to 65 minutes.

[0018] The third aspect of this application provides the use of the composition described in the first aspect of this application in repairing ultrahard coatings on transparent cover glass-ceramic surfaces.

[0019] The beneficial effects of this application are:

[0020] This application provides a composition for separating an ultra-hard coating on the surface of a transparent cover glass ceramic, comprising: NaOH, KOH, NaKC4H4O6, C2H8N2, and Na5P3O 10Based on the mass of the composition, the mass percentage of NaOH is 1%~5%, the mass percentage of KOH is 1%~5%, the mass percentage of NaKC4H4O6 is 2%~7%, the mass percentage of C2H8N2 is 1%~8%, and the mass percentage of Na5P3O is... 10 The mass percentage of the composition is 2% to 11%. Using the composition of this application to erode defect areas in the ultra-hard coating on the surface of a transparent cover glass-ceramic plate achieves the following technical effects:

[0021] (1) Local separation of the superhard coating without damaging the transparent cover glass ceramic, without completely removing the entire superhard coating, and without using large mechanical polishing equipment.

[0022] (2) It can effectively avoid material warping caused by uneven stress on the surface of the cover glass ceramic due to mechanical polishing;

[0023] (3) After the superhard coating is etched, only a small mechanical grinding equipment is used for local surface polishing. This technology is extremely mature in the field of optical glass processing. The equipment is small in size, low in investment, low in energy consumption and low in noise during operation.

[0024] Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these accompanying drawings.

[0026] Figure 1 This application provides an embodiment of a device for separating an ultra-hard coating on a transparent cover glass-ceramic surface.

[0027] In the diagram, 1. Container, 2. Heating device, 3. Soft piston, 4. Ultra-hard coating, 5. Transparent glass-ceramic cover. Detailed Implementation

[0028] The technical solutions of this application will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on this application are within the scope of protection of this application.

[0029] The first aspect of this application provides a composition for separating an ultra-hard coating on a transparent cover glass-ceramic surface, comprising: NaOH, KOH, NaKC4H4O6, C2H8N2, and Na5P3O 10 Based on the mass of the composition, the mass percentage of NaOH is 1%~5%, the mass percentage of KOH is 1%~5%, the mass percentage of NaKC4H4O6 is 2%~7%, the mass percentage of C2H8N2 is 1%~8%, and the mass percentage of Na5P3O is... 10 The mass percentage content is 2%~11%.

[0030] In one embodiment of this application, based on the mass of the composition, the mass percentage of NaOH is 2%~4%, the mass percentage of KOH is 2%~4%, the mass percentage of NaKC4H4O6 is 3%~5%, the mass percentage of C2H8N2 is 3%~6%, and the mass percentage of Na5P3O is... 10 The mass percentage content is 4%~9%.

[0031] In this application, based on the mass of the composition, the mass percentage of NaOH can be 1%, 2%, 3%, 4%, 5%, or a range of any two values ​​therein; the mass percentage of KOH can be 1%, 2%, 3%, 4%, 5%, or a range of any two values ​​therein; the mass percentage of NaKC4H4O6 can be 2%, 3%, 4%, 5%, 6%, 7%, or a range of any two values ​​therein; the mass percentage of C2H8N2 can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, or a range of any two values ​​therein; and the mass percentage of Na5P3O... 10 The mass percentage content is 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, or a range of any two of these values.

[0032] The inventors discovered in their research that the composition for separating the ultra-hard coating on the surface of a transparent cover glass ceramic includes NaOH, KOH, NaKC4H4O6, C2H8N2, and Na5P3O 10 And NaOH, KOH, NaKC4H4O6, C2H8N2 and Na5P3O 10 By limiting the content of [specific component] within the above range, local separation of defective areas in the ultra-hard coating can be achieved without damaging the transparent cover glass ceramic.

[0033] In one embodiment of this application, the composition further includes water; the water content is 64% to 93% by mass, preferably 72% to 86%, based on the mass of the composition. For example, the water content can be 64%, 70%, 75%, 80%, 85%, 93%, or a range of any two of these values, based on the mass of the composition. Limiting the water content to the above range allows for better local separation of defective areas in the ultra-hard coating without damaging the transparent cover glass ceramic.

[0034] A second aspect of this application provides a method for separating an ultra-hard coating on a transparent cover glass-ceramic surface, comprising:

[0035] Locate the defective areas of the ultra-hard coating on the glass-ceramic surface of the transparent cover plate;

[0036] The composition described in the first aspect of this application is heated and the defective area is eroded;

[0037] Polish the eroded area to separate the defective areas of the superhard coating.

[0038] In this application, the method for locating defective areas of the ultra-hard coating on the surface of the transparent cover glass ceramic is not particularly limited. For example, common defects such as bubbles and dirt can be detected by manual visual inspection under inspection light and / or microscopy; coating peeling, cracking and thickness discrepancies can all be detected by measuring refractive index and color value.

[0039] In one embodiment of this application, the superhard coating is selected from diamond-like carbon coatings, silicon nitride-based coatings, or silicon carbide-based coatings. The method of this application can achieve separation of multiple types of superhard coatings.

[0040] In this application, the method for preparing the composition is not particularly limited. For example, NaOH, KOH, NaKC4H4O6, C2H8N2 and Na5P3O can be used. 10 It is obtained by dissolving and mixing in water.

[0041] In one embodiment of this application, the heating temperature is 85~115℃, preferably 95~105℃. For example, the heating temperature can be 85℃, 90℃, 95℃, 100℃, 105℃, 110℃, 115℃, or a range of any two of these values. Limiting the heating temperature within the above temperature range ensures that the composition can better achieve local separation of the defective areas of the ultra-hard coating without damaging the transparent cover glass-ceramic body, and reduces solvent evaporation efficiency, ensuring the stability of the composition components and slowing down the degradation of the composition performance.

[0042] In one embodiment of this application, the etching time is 30-150 minutes, preferably 45-65 minutes. For example, the etching time can be 30 minutes, 40 minutes, 50 minutes, 60 minutes, 70 minutes, 80 minutes, 90 minutes, 100 minutes, 110 minutes, 120 minutes, 130 minutes, 140 minutes, 150 minutes, or a range of any two of these values. Limiting the etching time to the above range ensures the local separation effect of the defect area in the superhard coating while improving equipment uptime and reducing power consumption.

[0043] In this application, the apparatus for heating the composition and eroding the defective area is not particularly limited, as long as it achieves the purpose of this application. For example, an apparatus such as... Figure 1 The apparatus shown places the composition in a container 1. One end of the container 1 is a soft piston 3, which can fit tightly against the defect area to prevent the composition from leaking. An external heating device 2 is placed in the container to heat the composition. After the erosion is complete, the composition is removed and the container is dismantled.

[0044] In this application, the polishing method is not particularly limited, as long as it achieves the purpose of this application. For example, polishing can be performed by mechanical, chemical, and electrochemical methods. The purpose of polishing is to ensure the flatness and optical consistency of the glass-ceramic surface (unevenness will result in diffuse reflection, which will cause optical distortion when a display module is mounted), and to improve the adhesion of the coating during regional coating.

[0045] The third aspect of this application provides the use of the composition described in the first aspect of this application in repairing ultrahard coatings on transparent cover glass-ceramic surfaces.

[0046] The composition of this application heats and erodes the defective area, eliminating the need to completely remove the entire superhard coating and the use of large mechanical polishing equipment. It also effectively avoids material warping caused by uneven stress on the cover glass ceramic surface due to mechanical polishing. After coating erosion, only small-scale mechanical grinding equipment is used for localized surface polishing. This technology is extremely mature in the field of optical glass processing, with small equipment size, low investment, low energy consumption, and low noise during operation. Therefore, the composition of this application can be used for the repair of superhard coatings on the surface of transparent cover glass ceramics.

[0047] Example

[0048] The embodiments and comparative examples provided below illustrate the implementation of this application in more detail. Various tests and evaluations were conducted according to the methods described below. Furthermore, unless otherwise specified, "parts" and "%" are quality standards.

[0049] Test methods and equipment

[0050] 1. Surface Roughness Test: A stylus-type surface roughness measuring instrument was used, referring to the national standard GB / T 45505.2-2025. The diamond stylus was moved across the cover plate surface to directly measure and calculate parameters such as Ra and Rz. The specific steps are as follows:

[0051] (1) Instrument positioning: Place the roughness tester stably on the glass ceramic cover plate, adjust the instrument position so that the stylus is perpendicular to the surface to be measured, and ensure that the drive box or sensor is in good contact with the surface without tilting; (2) Stylus contact: Gently lower the stylus so that the stylus tip contacts the glass ceramic surface, observe the instrument display, and confirm that the stylus has made stable contact (usually there is a contact indicator light). Note: The contact force should be light to avoid impact or excessive pressure that could damage the stylus or scratch the glass; (3) Start measurement: Press the start / measurement button, and the instrument will start measuring automatically. Keep the instrument stable during the measurement process and avoid any movement or vibration. Observe the stylus movement trajectory to ensure that it moves smoothly within the measurement area; (4) Measurement completion: After the measurement is completed, the instrument will stop automatically and display the measurement results. First, lift the stylus, then move the instrument and record the measurement data (Ra, Rz and other parameter values); (5) Repeat measurement: Measure at least 3 times at different positions in the same measurement area and take the average value as the final result.

[0052] 2. Optical colorimetry test: The colorimetric value of the cover glass was directly measured and read using a spectrophotometer (Konica Minolta CM-3700A). The specific steps (reflection mode) are as follows:

[0053] (1) Mode switching and parameter setting: Select the "Reflection Measurement" mode in the software, switch the optical system to d / 8 (diffuse illumination, 8° reception), set the measurement conditions: select SCI (including specular reflection), set the UV content: adjust the UV filter position according to whether the glass ceramic contains fluorescent components (conventional glass ceramics are usually set to UV cutoff); (2) Sample placement: place the cleaned glass ceramic cover plate on the reflection measurement stage, ensuring the surface is flat and not tilted, use the sample pressure plate or clamp to fix the sample to prevent movement during the measurement, and confirm through the viewfinder that the measurement area is located in the center of the target cover; (3) Execute the measurement: click the "Measure" button in the software or press the instrument's measurement key, keep the instrument stable and avoid vibration (the measurement time is about 0.6-0.8 seconds), after the measurement is completed, the instrument automatically outputs the colorimetric data (Lab). (4) Repeated measurements: Measure at least 3 times (5 times recommended) at different locations on the same sample. After each measurement, slightly move the sample position to avoid repeated measurements of the same area and record all measurement data.

[0054] 3. Optical transmittance test: The transmittance of the cover glass was directly measured and read using a spectrophotometer (Konica Minolta CM-3700A). The specific steps are as follows:

[0055] (1) Mode confirmation: Confirm that the instrument has been switched to transmission measurement mode (d / 0 optical system), and that there are no obstructions in the transmission chamber to ensure that the light path is unobstructed; (2) Sample placement: Open the transmission sample chamber cover and vertically insert the cleaned glass ceramic cover into the transmission sample holder (or place it directly in front of the transmission window) to ensure that the sample completely covers the transmission measurement aperture (about Φ20mm). Close the transmission chamber cover to ensure good sealing; (3) Execute measurement: Click the "Measure" button in the software to start the measurement. The instrument automatically collects the transmitted light signal and calculates the spectral transmittance. After the measurement is completed, the software displays the transmittance data (usually expressed as %), which can display the transmittance of the entire band or a specific wavelength; (4) Data recording: Record the transmittance value (T%). Usually, we focus on the average transmittance of the visible light band (380-780nm). This application measures the transmittance of a specific wavelength of 550nm. We set the relevant wavelength points in the software and repeated the measurement 3 times to take the average value.

[0056] Example 1

[0057] (1) The defect range was determined by visual inspection and then precisely located by microscope. It was found that the defects in the diamond-like coating on the glass ceramic surface of the transparent cover plate were impurities in the coating, which appeared as irregular dot-shaped or strip-shaped foreign objects.

[0058] (2) Add NaOH, KOH, NaKC4H4O6, C2H8N2 and Na5P3O 10 The components are dissolved in water and mixed to obtain a composition; wherein, based on the mass of the composition, the mass percentages of NaOH, KOH, NaKC4H4O6, C2H8N2, and Na5P3O are 2.7%, 2%, 3.2%, 4.5%, and 4.5%, respectively. 10 The mass percentage of is 7%, and the mass percentage of H2O is 80.6%.

[0059] (3) Adopting such Figure 1 The apparatus shown places the prepared composition in a glass container 1, and a heating device 2 is placed outside the glass container 1 to heat the composition to 105°C. The lower end interface of the glass container is a soft piston 3, which is in close contact with the defect area. Under heating, the composition etches the superhard coating of the defect area for 55 minutes.

[0060] (4) Mechanical polishing of the eroded area: Use polishing powder and high-speed friction of the surface by the polishing disc of the polishing machine to obtain a smooth and flat surface.

[0061] Examples 2 to 10

[0062] In addition to adjusting NaOH, KOH, NaKC4H4O6, C2H8N2, and Na5P3O according to Table 1 10 Except for the mass percentage of H2O, it is the same as in Example 1.

[0063] Example 11

[0064] Except for changing "heat the composition to 105°C" to "heat the composition to 85°C", the rest is the same as in Example 6.

[0065] Example 12

[0066] Except for changing "heat the composition to 105°C" to "heat the composition to 115°C", the rest is the same as in Example 6.

[0067] Example 13

[0068] Except for changing "erosion time is 55 minutes" to "erosion time is 30 minutes", everything else is the same as in Example 6.

[0069] Example 14

[0070] Except for changing "erosion time is 55 minutes" to "erosion time is 150 minutes", everything else is the same as in Example 6.

[0071] Example 15

[0072] Except for replacing step (1) with “determining the defect range by visual inspection and then using a microscope to accurately locate it, and finding that the defect in the silicon nitride-based coating on the glass ceramic surface of the transparent cover plate is an impurity in the coating, which is manifested as irregular dot-shaped or strip-shaped foreign matter”, the rest of the steps are the same as in Example 6.

[0073] Example 16

[0074] Except for replacing step (1) with “determining the defect range by visual inspection and then using a microscope to accurately locate it, and finding that the defect in the silicon carbide-based coating on the surface of the transparent cover glass ceramic is an impurity in the coating, which is manifested as irregular dot-shaped or strip-shaped foreign matter”, the rest of the steps are the same as in Example 6.

[0075] Comparative Examples 1 to 5

[0076] In addition to adjusting NaOH, KOH, NaKC4H4O6, C2H8N2, and Na5P3O according to Table 1 10 Except for the mass percentage of H2O, it is the same as in Example 1.

[0077] The preparation parameters of each embodiment and comparative example are shown in Table 1, and the performance parameters of each embodiment and comparative example are shown in Table 2.

[0078] Table 1

[0079] In Table 1, " / " indicates that there are no relevant parameters.

[0080] Table 2

[0081] The results above show that the composition for separating the ultra-hard coating on the glass-ceramic surface of the transparent cover plate includes NaOH, KOH, NaKC4H4O6, C2H8N2, and Na5P3O 10 And NaOH, KOH, NaKC4H4O6, C2H8N2 and Na5P3O 10 The content of these components is limited to the scope of this application, resulting in a short coating separation time, low surface roughness of the glass-ceramic, low chromaticity (b-value), and high optical transmittance. The composition for separating the ultra-hard coating on the glass-ceramic surface of the transparent cover plate does not simultaneously include NaOH, KOH, NaKC4H4O6, C2H8N2, and Na5P3O. 10 Or NaOH, KOH, NaKC4H4O6, C2H8N2 and Na5P3O 10 The content of certain components is outside the scope of this application, the coating separation time is long, or the coating does not separate, and it is impossible to simultaneously achieve both the smoothness of the glass-ceramic surface and its optical properties. The above results demonstrate that the composition of this application can achieve localized separation of defective areas in the ultra-hard coating without damaging the transparent cover glass-ceramic.

[0082] The above results also demonstrate that heating and etching the defective areas using the composition of this application results in short coating separation time, low surface roughness of the glass-ceramic, low chromaticity (b-value), and high optical transmittance. Furthermore, the method of this application eliminates the need for complete removal of the entire ultra-hard coating and the use of large mechanical polishing equipment; it also effectively avoids material warping caused by uneven stress on the cover glass-ceramic surface due to mechanical polishing; after coating etching, only small-scale mechanical grinding equipment is used for localized surface polishing. This technology is extremely mature in the field of optical glass processing, with small equipment size, low investment, low energy consumption, and low noise during operation. These results illustrate that the method of this application not only has a simple process and low equipment and material costs, but also achieves localized separation of defective areas in the ultra-hard coating without damaging the transparent cover glass-ceramic.

[0083] The results above also show that the composition of this application can achieve separation of multiple types of ultra-hard coatings without damaging the transparent cover glass ceramic, and has good application prospects.

[0084] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A composition for separating an ultra-hard coating on a transparent cover glass-ceramic surface, comprising: NaOH, KOH, NaKC4H4O6, C2H8N2, and Na5P3O 10 Based on the mass of the composition, the mass percentage of NaOH is 1%~5%, the mass percentage of KOH is 1%~5%, the mass percentage of NaKC4H4O6 is 2%~7%, the mass percentage of C2H8N2 is 1%~8%, and the mass percentage of Na5P3O is... 10 The mass percentage content is 2%~11%.

2. The composition according to claim 1, wherein, Based on the mass of the composition, the mass percentage of NaOH is 2%~4%, the mass percentage of KOH is 2%~4%, the mass percentage of NaKC4H4O6 is 3%~5%, the mass percentage of C2H8N2 is 3%~6%, and the mass percentage of Na5P3O is... 10 The mass percentage content is 4%~9%.

3. The composition according to claim 1, wherein, The composition further includes water; the water accounts for 64% to 93% of the mass based on the mass of the composition.

4. The composition according to claim 1, wherein, Based on the mass of the composition, the mass of the water is 72% to 86%.

5. A method for separating an ultra-hard coating on the surface of a transparent cover glass ceramic plate, comprising: Locate the defective areas of the ultra-hard coating on the glass-ceramic surface of the transparent cover plate; The composition according to any one of claims 1 to 4 is heated and the defective area is eroded; Polish the eroded area to separate the defective areas of the superhard coating.

6. The method according to claim 5, wherein, The superhard coating is selected from diamond-like carbon coatings, silicon nitride-based coatings, or silicon carbide-based coatings.

7. The method according to claim 5, wherein, The heating temperature is 85~115℃.

8. The method according to claim 5, wherein, The erosion process takes 30 to 150 minutes.

9. The method according to claim 8, wherein, The erosion process takes 45 to 65 minutes.

10. Use of the composition according to any one of claims 1 to 4 in repairing the ultrahard coating on the glass-ceramic surface of a transparent cover plate.

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