Preparation method of texture cover plate

Abstract

The invention discloses a preparation method of a texture cover plate. The preparation method comprises the following steps: S1, cleaning a glass substrate; s2, attaching a protective film to the non-treated surface of the glass substrate; s3, carrying out frosting treatment on the treated surface of the glass substrate, wherein a frosting solution comprises the following components: NH4HF2, sulfuric acid, Na2SiF6, CaF2, NH4HSO4, a dispersing agent and deionized water; s4, the frosted treatment surface is subjected to chemical polishing treatment, a polishing solution comprises sulfuric acid, phosphoric acid, NH4HF2, a dispersing agent, a corrosion inhibitor and deionized water, and an anti-dazzle layer is formed on the treatment surface of the glass substrate; and S5, silk-screening a texture layer on the non-treated surface of the glass substrate. According to the preparation method of the texture cover plate provided by the invention, the haze of the cover plate can be improved, and meanwhile, the influence on screen display is reduced.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a method for preparing a textured cover plate. Background Art

[0002] With the development of car interaction technology, car interiors are becoming more and more diverse. High-end car interiors often introduce leather textures, wood grains and other materials to enhance the high-end texture.

[0003] There are various methods of making textured cover plates on the market, such as laser engraving, printing, etc. Although the image is very fine and similar to the texture pattern, it lacks the roughness of the texture due to the high glossiness.

[0004] To achieve the aforementioned high gloss, the cover plate on the market is usually etched to achieve a high fog effect. However, the surface texture of conventional high fog cover plates is not fine enough, resulting in a lot of color noise when displayed. For example, this color noise is more severe when displaying white or green images. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for preparing a textured cover plate, which can improve the haze of the cover plate while reducing the impact on screen display.

[0006] Based on the above problems, the technical solution provided by the present invention is:

[0007] A method for preparing a textured cover plate comprises the following steps:

[0008] S1. Cleaning the glass substrate;

[0009] S2. attaching a protective film to the non-treated surface of the glass substrate;

[0010] S3, frosting the treated surface of the glass substrate, wherein the frosting solution comprises the following components: NH4HF2, sulfuric acid, Na2SiF6, CaF2, NH4HSO4, a dispersant, and deionized water;

[0011] S4, chemically polishing the treated surface after frosting, using a polishing solution comprising the following components: sulfuric acid, phosphoric acid, NH4HF2, a dispersant, a corrosion inhibitor, and deionized water, to form an anti-glare layer on the treated surface of the glass substrate;

[0012] S5. Silk-screen a texture layer on the non-treated surface of the glass substrate.

[0013] In some embodiments, the frosting liquid in step S3 includes the following components in mass percentage: 8% to 15% NH4HF2, 10% to 25% sulfuric acid, 1% to 5% Na2SiF6, 1% to 2% CaF2, 3% to 6% NH4HSO4, 0.1% to 3% dispersant, and the rest is ionized water.

[0014] In some embodiments, NH4HF2 is first dissolved in part of deionized water, and then concentrated sulfuric acid is slowly added while stirring, followed by sequential addition of Na2SiF6, CaF2, NH4HSO4, and a dispersant, and finally deionized water is added to 100%, with the preparation temperature range being 22-24°C.

[0015] In some embodiments, in step S3, high-pressure water jet coating is used for frosting treatment, with a coating pressure of 0.2-0.5 MPa, a coating thickness of 0.1-0.3 mm, and a coating time of 5-30 s.

[0016] In some embodiments, in step S3 , the roughness of the processed surface of the glass substrate is controlled to be Ra less than 0.5 μm, and the roughness interval mean value RSM is controlled to be ≤ 30 μm.

[0017] In some embodiments, the polishing liquid in step S4 includes the following components in mass percentage: 15% to 25% sulfuric acid, 8% to 10% phosphoric acid, 1% to 3% NH4HF2, 1% to 3% dispersant, 1% to 4% corrosion inhibitor, and the rest is deionized water.

[0018] In some embodiments, the preparation process of the polishing liquid in step S4 is: first add a certain amount of deionized water, slowly add sulfuric acid, add phosphoric acid when the temperature drops below 30°C, then add NH4HF2 in batches, dissolve the dispersant separately and add it to the mixed liquid, then add the corrosion inhibitor and stir evenly, and finally add deionized water to 100% and stir evenly.

[0019] In some embodiments, in step S4, a small-hole spray method is used for chemical polishing, the spraying time is 2 to 120 seconds, the number of spraying times is 1 to 5 times, and the spraying reaction temperature is 25 to 60°C.

[0020] In some embodiments, step S4 controls the roughness of the processed surface of the glass substrate to be Ra less than 0.15 μm and the roughness interval mean value RSM ≤ 20 μm.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] By frosting and chemically polishing the inside of the glass substrate, the haze of the cover plate can be improved while meeting the low flash point requirement without affecting the high-definition display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 This is a structural schematic diagram of a textured cover plate obtained by a method for preparing a textured cover plate according to the present invention;

[0025] in:

[0026] 1. Glass substrate;

[0027] 2. Anti-glare layer;

[0028] 3. Texture layer. DETAILED DESCRIPTION

[0029] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the present invention and are not intended to limit the scope of the present invention. The implementation conditions adopted in the examples can be further adjusted according to the conditions of the specific manufacturer. The implementation conditions not specified are generally those in routine experiments.

[0030] A method for preparing a textured cover plate comprises the following steps:

[0031] S1. Clean the glass substrate using a flatbed cleaning machine equipped with an air knife to dry the glass;

[0032] S2. Attaching a protective film to the non-treated surface of the glass substrate, wherein the protective film is a polyester film with acrylic adhesive;

[0033] S3, frosting the treated surface of the glass substrate, wherein the frosting solution comprises the following components: NH4HF2, sulfuric acid, Na2SiF6, CaF2, NH4HSO4, a dispersant, and deionized water;

[0034] S4, chemically polishing the treated surface after frosting, using a polishing solution comprising the following components: sulfuric acid, phosphoric acid, NH4HF2, a dispersant, a corrosion inhibitor, and deionized water, to form an anti-glare layer on the treated surface of the glass substrate;

[0035] S5, screen printing the texture layer on the non-treated surface of the glass substrate to obtain Figure 1 The textured cover plate shown includes a glass substrate 1 , an anti-glare layer 2 arranged on the outer surface of the glass substrate 1 , and a texture layer 3 arranged on the inner surface of the glass substrate 1 .

[0036] The frosting solution in step S3 comprises the following components by mass: 8%-15% NH4HF2, 10%-25% sulfuric acid, 1%-5% Na2SiF6, 1%-2% CaF2, 3%-6% NH4HSO4, 0.1%-3% dispersant, and the remainder deionized water. NH4HF2 decomposes to produce HF, which etches the glass surface to form micropits and control the frosting roughness. Sulfuric acid provides an acidic environment, promoting HF dissociation, regulating the etching rate, and enhancing frosting uniformity. Na2SiF6 stabilizes the etching process, preventing rapid HF consumption and ensuring a uniform reaction during curtain coating. CaF2 adjusts the frosting depth and enhances the three-dimensional effect of the microstructure. NH4HSO4 stabilizes the solution pH, preventing excessive HF volatilization and improving the surface finish of the frosting. The dispersant ensures uniform particle dispersion and improves the consistency of the curtain coating layer. Sodium polyacrylate is used as the dispersant.

[0037] The preparation process of the frosting liquid in step S3 is as follows: first dissolve NH4HF2 in part of deionized water, then slowly add concentrated sulfuric acid while stirring, then add Na2SiF6, CaF2, NH4HSO4, and dispersant in sequence, and finally add deionized water to 100%. The preparation temperature range is 22-24°C.

[0038] In step S3, frosting is performed using a high-pressure water jet coating method. The coating pressure is 0.2-0.5 MPa, the coating thickness is 0.1-0.3 mm, and the coating time is 5-30 seconds. Specifically, the frosting liquid is installed in a slot-type coating machine, and the glass substrate is placed on a mesh belt conveyor system. The frosting liquid is then applied to the glass substrate surface. In this step, the roughness of the treated surface of the glass substrate is controlled to be less than 0.5 μm Ra and less than 30 μm RSM.

[0039] In step S4, the polishing liquid comprises the following components by mass percentage: 15% to 25% sulfuric acid, 8% to 10% phosphoric acid, 1% to 3% NH4HF2, 1% to 3% sodium polyacrylate (dispersant), 1% to 4% corrosion inhibitor, and the remainder is deionized water. Preferably, the corrosion inhibitor comprises 1% to 3% glycerol and 0.5% to 1% polyethylene glycol. Sulfuric acid provides an acidic environment, dissolving surface protrusions and leading the chemical polishing reaction; phosphoric acid assists in leveling, forming a temporary protective film on the glass surface and slowing down uniform dissolution; NH4HF2 retains a small amount of fluoride ions, lightly etching and refining surface defects; the dispersant prevents particle agglomeration and ensures uniform contact of the polishing liquid with the surface; the corrosion inhibitor controls the polishing rate; and deionized water adjusts the solution concentration.

[0040] The preparation process of the polishing liquid in step S4 is as follows: first add a certain amount of deionized water, slowly add sulfuric acid, add phosphoric acid when the temperature drops below 30°C, then add NH4HF2 in batches, dissolve the dispersant separately and add it to the mixed liquid, then add the corrosion inhibitor and stir evenly, and finally add 100% deionized water and stir evenly.

[0041] In step S4, chemical polishing is performed using a small-hole spray coating method. The spraying time is 2 to 120 seconds, the number of sprays is 1 to 5, and the spraying reaction temperature is 25 to 60°C. Specifically, the polishing liquid is installed in a small-hole sprayer, and the glass substrate is placed on a mesh belt conveyor system. The polishing liquid is sprayed onto the glass substrate surface. In this step, the roughness of the treated surface of the glass substrate is controlled to Ra less than 0.15μm and the roughness interval mean (RSM) ≤ 20μm.

[0042] Example 1

[0043] The glass raw material is cut into 800*200mm middle plates, the cut middle plates are placed in an ultrasonic cleaning machine for cleaning, and then a protective film is attached to the non-treated surface of the glass substrate for protection.

[0044] Prepare frosting liquid, the mass percentage of which is 10% NH4HF2, 20% sulfuric acid, 2% Na2SiF6, 1% CaF2, 5% NH4HSO4, 1.5% sodium polyacrylate (dispersant), and the rest is deionized water.

[0045] To prepare the frosting solution, add 50% deionized water to the reactor and start stirring. Next, add NH4HF2 and stir until completely dissolved. Slowly add sulfuric acid, monitoring the reaction as you add. If the temperature rises too quickly, cool it down before adding again. Stir for 15 minutes after addition. Next, add Na2SiF6, CaF2, NH4HSO4, and sodium polyacrylate (dispersant) in sequence. When adding CaF2, activate the ultrasonic dissolution device to accelerate dissolution. Then, top up with deionized water to 100%. Stir for 20 minutes after adding each raw material, closely monitoring the solution. During the preparation process, use a circulating cooling water system to maintain the solution temperature between 22 and 24°C. Stir and mature the frosting solution for 6 hours at 45°C.

[0046] The frosting solution was installed on a slot-type flow coater. The glass substrate was placed on a horizontal conveyor and sprayed with a water jet. The water jet pressure was adjusted to 0.4 MPa and the spray thickness to 0.1-0.3 mm to ensure a smooth cut surface. The process achieved an Ra of 0.12 μm and an Rsm of 20 μm, meeting the requirements.

[0047] The polishing liquid of this embodiment has the following proportions: 20% sulfuric acid (98%), 9% phosphoric acid, 22% NH4HF, 1% sodium polyacrylate (dispersant), 2% glycerol (corrosion inhibitor), 0.8% polyethylene glycol (corrosion inhibitor), and the remainder is ionized water.

[0048] Prepare the polishing liquid. First add 50% of deionized water and start stirring at low speed. Then slowly add sulfuric acid to the water along the wall of the container. The dripping rate is controlled at 5-10g / min. At the same time, monitor the temperature. If it exceeds 50°C, suspend the addition and continue after the temperature drops below 30°C (the exothermic reaction is violent and needs to be added in batches). Then add phosphoric acid and stir for 5 minutes until it is completely miscible. Add NH4HF2 in equal amounts in 3 times, with an interval of 2 minutes each time to ensure that the powder is completely dissolved. Take 50g of deionized water separately, slowly sprinkle in sodium polyacrylate powder at room temperature, and stir at high speed while adding. Glycerin (corrosion inhibitor) and polyethylene glycol (corrosion inhibitor) are directly mixed and added, and stirred for 20 minutes until they are completely miscible. Add deionized water to 100% and stir evenly.

[0049] Polishing: Use a small-hole sprayer to apply the polishing liquid. The sprayer's orifice diameter is 0.4mm, and the spray pressure is 0.6MPa. The frosted glass is fixed on a workbench and sprayed in a spiral pattern to ensure full coverage. Rinse with deionized water within 10 seconds after spraying to avoid over-polishing. Finally, the polished glass substrate is cleaned in an alkaline flatbed washer before CNC edge grinding, chemical tempering, and silk-screening.

[0050] Finally, the polished glass substrate is cleaned in a flatbed washer with alkaline detergent and then subjected to CNC edge grinding, chemical tempering and silk-screen texture processing.

[0051] Product testing: Refer to ISO4287 standard, use a surface roughness meter to measure roughness Ra and Rsm; refer to ISO13468 standard, use a transmission photometer to measure transmittance; refer to ISO14782 standard, use a spectrophotometer to measure haze; use a spectroradiometer to measure sparkle value (Sparkle), and measure the area ratio of visual noise or sparkle against a gray background.

[0052] The reflective haze measured by Konica Minolta's IQS gloss meter is HZ(E)=21; the roughness parameters measured by Mitutoyo SJ210 roughness meter are Ra=0.08μ and Rsm average is 18μ; the flash point value (Sparkle) measured by a spectroradiometer is 1.2.

[0053] Example 2

[0054] This embodiment is anti-glare glass for 4K ultra-high-definition displays.

[0055] The frosting formula of this embodiment needs to be properly optimized based on Example 1: CaF2 particle size ≤ 30nm.

[0056] A frosting solution was prepared, wherein the mass percentage of the frosting solution was 12% NH₄HF₂, 20% sulfuric acid, 3% Na₂SiF₂, 1.8% CaF₂, 5% NH₄HSO₄, 1.8% sodium polyacrylate (dispersant), and the remainder was deionized water. The preparation method of the frosting solution was the same as that of Example 1.

[0057] The frosting liquid was installed on a slot-type flow coater. The glass substrate was placed on a horizontal conveyor and sprayed with a water jet. During the spraying process, the water jet pressure was adjusted to 0.3 MPa and the spray thickness to 0.1-0.3 mm to ensure a smooth cut surface. This process achieved an Ra of 0.35 μm and an Rsm of 20 μm, meeting the requirements.

[0058] The polishing solution in this example is formulated as follows: 20% 98% sulfuric acid, 9% phosphoric acid, 22% NH₄HF, 1.5% sodium polyacrylate (dispersant), 0.8% glycerin (corrosion inhibitor), and 1.2% polyethylene glycol (corrosion inhibitor). The remainder is deionized water. The polishing solution is prepared in the same manner as in Example 1.

[0059] Polishing, use a small hole sprayer to spray the polishing liquid. The polishing of this embodiment is completed in three stages, the diameters of the three nozzles gradually increase, and the spraying pressure gradually decreases. The diameter of the first spray nozzle is 0.5mm, and the pressure is 0.4Mpa. The time is 15s. After the completion of this stage, Ra=0.28μ, Rsm=20μ; the diameter of the second stage spray nozzle is 0.6mm, and the pressure is 0.35Mpa. After the completion of this stage, Ra=0.2μ, Rsm=18μ. The diameter of the second stage spray nozzle is 0.7mm, and the pressure is 0.3Mpa. After the completion of this stage, Ra=0.12μ, Rsm=17μ. The first stage has a small aperture and a high pressure, which is conducive to removing macroscopic defects on the surface. In the second stage, the pressure is reduced, the impact force is reduced, and grinding is mainly used to reduce Ra and Rsm. The third stage is a large-area low-speed spray, which is mainly for polishing to further reduce Ra. Finally, the polished glass substrate was cleaned in a flatbed washer with alkaline detergent and then processed with CNC edge grinding, chemical tempering, and silk-screening with texture ink and black BM ink.

[0060] The reflective haze measured by Konica Minolta's IQS gloss meter is HZ(E)=25; the roughness parameters measured by Mitutoyo roughness meter SJ210 are Ra=0.12μ and Rsm average is 17μ; the flash point value (Sparkle) measured by spectroradiometer is 1.

[0061] Example 3

[0062] The frosting liquid of this embodiment is prepared in the same manner as in Example 1, wherein the mass percentages are 15% NH4HF2, 20% sulfuric acid, 65% Na2SiF2, 2% CaF2, 6% NH4HSO4, 1% sodium polyacrylate (dispersant), and the remainder is deionized water.

[0063] The frosting liquid was installed on a slot-type flow coater. The glass substrate was placed on a horizontal conveyor and sprayed with a water jet. During the spraying process, the water jet pressure was adjusted to 0.4 MPa and the spray thickness to 0.1-0.3 mm to ensure a smooth cut surface. The process achieved an Ra of 0.15 μm and an Rsm of 22 μm, meeting the requirements.

[0064] The polishing liquid of this embodiment is prepared in the following proportions: 15% sulfuric acid (98%), 8% phosphoric acid, 21% NH4HF, 1% sodium polyacrylate (dispersant), 1% glycerol (corrosion inhibitor), 0.5% polyethylene glycol (corrosion inhibitor), and 73.5% deionized water. The preparation method of the polishing liquid is the same as that of Example 1.

[0065] Polishing: Use a small-hole sprayer to apply the polishing liquid. The sprayer's orifice diameter is 0.4 mm, and the spray pressure is 0.5 MPa. Secure the frosted glass to a workbench and apply the coating using a spiral spray pattern to ensure full coverage. Rinse with deionized water within 20 seconds after spraying to avoid over-polishing. The polished surface has a roughness of Ra = 0.09 μm, RSM = 19, a reflective haze of HZ(E) = 22, and a transmittance sparkle of 1.4.

[0066] The polished glass is then cut, CNC-processed, and tempered.

[0067] Then, black BM ink (Seiko GV3 series ink) is printed on the back of the cover to create a texture layer.

[0068] In summary, the textured cover plate prepared by this method can improve the haze, increase the texture texture, and reduce the flash point value without affecting the high-definition display effect.

[0069] The above examples are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A method for preparing a textured cover plate, characterized in that: The following steps are involved: S1. Cleaning the glass substrate; S2. attaching a protective film to the non-treated surface of the glass substrate; S3, frosting the treated surface of the glass substrate, wherein the frosting solution comprises the following components: NH4HF2, sulfuric acid, Na2SiF6, CaF2, NH4HSO4, a dispersant, and deionized water; S4, chemically polishing the treated surface after frosting, using a polishing solution comprising the following components: sulfuric acid, phosphoric acid, NH4HF2, a dispersant, a corrosion inhibitor, and deionized water, to form an anti-glare layer on the treated surface of the glass substrate; S5. Silk-screen a texture layer on the non-treated surface of the glass substrate.

2. The method for preparing a textured cover plate according to claim 1, wherein: The frosting liquid in step S3 includes the following components in mass percentage: 8% to 15% of NH4HF2, 10% to 25% of sulfuric acid, 1% to 5% of Na2SiF6, 1% to 2% of CaF2, 3% to 6% of NH4HSO4, 0.1% to 3% of dispersant, and the rest is deionized water.

3. The method for preparing a textured cover plate according to claim 1, wherein: The preparation process of the frosting liquid in step S3 is as follows: first dissolve NH4HF2 in part of deionized water, then slowly add concentrated sulfuric acid while stirring, then add Na2SiF6, CaF2, NH4HSO4, and dispersant in sequence, and finally add deionized water to 100%. The preparation temperature range is 22-24°C.

4. The method for preparing a textured cover plate according to claim 1, wherein: In step S3, a high-pressure water jet coating method is used for frosting treatment, with a coating pressure of 0.2 to 0.5 MPa, a coating thickness of 0.1 to 0.3 mm, and a coating time of 5 to 30 seconds.

5. The method for preparing a textured cover plate according to claim 4, characterized in that: Step S3: In this step, the roughness of the processed surface of the glass substrate is controlled to be Ra less than 0.5 μm, and the roughness interval mean value RSM is controlled to be less than 30 μm.

6. The method for preparing a textured cover plate according to claim 1, wherein: The polishing liquid in step S4 includes the following components in mass percentage: 15% to 25% sulfuric acid, 8% to 10% phosphoric acid, 1% to 3% NH4HF2, 1% to 3% dispersant, 1% to 4% corrosion inhibitor, and the rest is deionized water.

7. The method for preparing a textured cover plate according to claim 1, wherein: The preparation process of the polishing liquid in step S4 is as follows: first add a certain amount of deionized water, slowly add sulfuric acid, add phosphoric acid when the temperature drops below 30°C, then add NH4HF2 in batches, dissolve the dispersant separately and add it to the mixed liquid, then add the corrosion inhibitor and stir evenly, and finally add deionized water to 100% and stir evenly.

8. The method for preparing a textured cover plate according to claim 1, wherein: In step S4, a small hole spray method is used for chemical polishing, the spraying time is 2 to 120 seconds, the number of spraying times is 1 to 5 times, and the spraying reaction temperature is 25 to 60°C.

9. The method for preparing a textured cover plate according to claim 8, characterized in that: In step S4 , the roughness of the processed surface of the glass substrate is controlled to be Ra less than 0.15 μm and the roughness interval mean value RSM less than or equal to 20 μm.

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