Processing method of 3D unequal-thickness glass cover plate and 3D unequal-thickness glass cover plate

Abstract

The invention provides a processing method of a 3D unequal-thickness glass cover plate and the 3D unequal-thickness glass cover plate. The processing method comprises the following steps: covering a preset crater position on one surface of the glass cover plate with an acid-resistant protective layer; the surface, covered with the acid-resistant protective layer, of the glass cover plate is subjected to whole-surface etching and thinning treatment, a crater structure higher than the surface is formed on the surface of the glass cover plate, and the unequal-thickness glass cover plate is obtained; and stripping the acid-resistant protective layer of the unequal-thickness glass cover plate, and then carrying out hot bending forming treatment to obtain the 3D unequal-thickness glass cover plate. According to the processing method of the 3D unequal-thickness glass cover plate and the 3D unequal-thickness glass cover plate, the surface, except the preset crater position, of the glass cover plate is integrally thinned through etching thinning treatment to obtain a crater structure, then the glass cover plate is made into a curved surface structure through hot bending forming treatment, and the 3D unequal-thickness glass cover plate is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D glass processing, and in particular to a processing method of a 3D unequal thickness glass cover plate and a 3D unequal thickness glass cover plate. Background Art

[0002] 3D unequal thickness glass cover has two meanings. One is that it has an overall 3D structure, which generally refers to the plane of the glass main body, and the angles of its outer edges are obtuse angles for two-sided bent products and four-sided bent products. Its manufacturing process mainly includes hot bending, which belongs to precision molding technology. The other is that it has a crater structure on its surface. The so-called crater structure refers to the raised shape of the camera hole of the glass cover. Since the surface where the crater is located is higher than its surface, this type of glass cover is also called unequal thickness glass cover.

[0003] At present, in the traditional 3D unequal thickness glass cover molding process, a hole is opened on the glass surface and the shape of a crater is pressed out by hot bending. Since the crater needs to be bent and materials are added from its surroundings, it is easy to cause material shortage around the crater, which in turn affects the final structure of the molded product, resulting in poor product appearance, inability to be molded in place, and easy to cause edge collapse. At the same time, there are large errors in the shape, surface shape, and aperture of the crater after molding, and there is no three-dimensional sense. Summary of the invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a processing method for a 3D unequal thickness glass cover plate and a 3D unequal thickness glass cover plate. The surface of the glass cover plate except for a preset crater position is first thinned by etching and thinning to obtain a crater structure, and then the glass cover plate is made into a curved structure by hot bending forming to obtain the 3D unequal thickness glass cover plate.

[0005] The present invention provides a method for processing a 3D glass cover plate of unequal thickness, comprising the following steps:

[0006] S1. Covering a preset crater position on a surface of a glass cover plate with an acid-resistant protective layer;

[0007] S2, performing an entire etching and thinning process on the surface of the glass cover plate covered with the acid-resistant protective layer, so that a crater structure higher than the surface is formed on the surface of the glass cover plate, thereby obtaining a glass cover plate of unequal thickness;

[0008] S3, after peeling off the acid-resistant protective layer of the unequal thickness glass cover plate, performing a hot bending forming process, thus obtaining the 3D unequal thickness glass cover plate.

[0009] In the present invention, firstly, a preset crater position on a surface of a glass cover plate is covered with an acid-resistant protective layer to shield and protect the preset crater position, and then the entire surface of the glass cover plate is etched and thinned, thereby realizing large-surface thinning of the surface of the glass cover plate except for the preset crater position, objectively forming a 2D unequal thickness glass with a crater structure, and then performing a hot bending forming process, the 2D unequal thickness glass is heated and softened and formed in a mold to form a 3D curved surface shape, that is, the 3D unequal thickness glass cover plate is obtained.

[0010] The above-mentioned processing method of the present invention can directly obtain the required unequal thickness crater structure through etching and thinning, which overcomes the defects of poor product appearance, inability to form in place, easy edge collapse and lack of three-dimensional sense caused by the crater formed by the hot bending process in the prior art. The obtained 3D unequal thickness glass cover plate will not have micro cracks in the preparation process, and does not require grinding, polishing and repair processing. The R angle of the unequal thickness crater is uniform and smooth, the crater has an obvious three-dimensional effect, and the edge feels smooth. The whole method is simple and convenient, and the yield rate is high.

[0011] Preferably, in step S1, the acid-resistant protective layer is obtained by adhering a UV viscosity-reducing film to a preset crater position of the glass cover plate.

[0012] Preferably, in step S2, during the etching and thinning process, the glass cover plate rotates while keeping the overall left-right swing;

[0013] Preferably, the frequency of the left-right swing of the glass cover plate is 10-15 Hz, and the rotation speed is 5-10 Hz.

[0014] In the present invention, etching is performed while maintaining shaking and rotation at the same time. On the one hand, the defect that the etching efficiency is greatly reduced due to the glass etching liquid being left stationary in the etching liquid for a long time can be avoided. On the other hand, etching residues can be avoided from covering the surface of the glass cover plate, which not only reduces the etching efficiency but also causes unevenness on the etching surface and very limited etching depth.

[0015] Compared with the process on the market that uses machining to cold carve the large surface of the glass cover plate, and then uses a CNC machine to match the corresponding grinding head to grind the large surface of the glass cover plate: not only does it have certain requirements on the equipment and needs to match the grinding head of corresponding specifications, but also the processing steps are long, the crater position cannot be formed in place, it is easy to cause edge collapse, and there are many defects in the product during the production process, affecting the yield of the production process; the present invention uses flow etching to thin the glass, which not only ensures the etching depth, but also overcomes the defects of the crater position cannot be formed in place, it is easy to cause edge collapse, and the yield is low when the crater structure is prepared by the machining method.

[0016] Preferably, in step S2, during the etching and thinning process, the etching liquid is sprayed from a direction perpendicular to the surface of the glass cover plate covered with the acid-resistant protective layer, and the temperature of the etching liquid is 25-35° C.;

[0017] Preferably, the spray pressure is 30-40 Hz.

[0018] In the present invention, the swung and rotated glass cover is etched by spraying etching liquid in a direction perpendicular to the surface of the glass cover, and finally the required unequal thickness craters and the required crater bottom R angle and crater arc edge width are obtained.

[0019] Preferably, the etching solution comprises, by weight percentage: 1-5% hydrofluoric acid, 5-35% ammonium fluoride, 5-10% inorganic acid, 0.5-3% nitrilotriacetic acid-based surfactant, and the balance water;

[0020] Preferably, the nitrilotriacetic acid-based surfactant is obtained by condensing nitrilotriacetic acid with a long-chain alkylamine and polyethylene glycol.

[0021] In the present invention, hydrofluoric acid and fluoride salt are the main components for etching the glass surface, the inorganic acid has the function of promoting the cleaning and etching of the glass cover plate, the nitrilotriacetic acid-based surfactant is obtained by condensing nitrilotriacetic acid with long-chain alkylamine and polyethylene glycol, and the polyether chain hydrophilic structure and the long-chain alkyl hydrophobic structure simultaneously possessed by the nitrilotriacetic acid surfactant are easy to form micelles, thereby encapsulating the insoluble products generated during etching and making them more easily soluble in water, thereby preventing the etching products from adhering to the surface of the glass cover plate, improving the etching rate and etching effect, and improving the etching depth of the large surface of the glass cover plate.

[0022] Preferably, in step S3, the acid-resistant protective layer is stripped by ultraviolet light.

[0023] Preferably, in step S3, the hot bending forming is obtained by placing the glass cover plates of unequal thickness in a cavity of a hot bending mold and sequentially performing preheating, forming, and cooling.

[0024] Preferably, the preheating temperature is 710-770°C, the molding temperature is 660-730°C, and the cooling temperature is 400-600°C.

[0025] In the present invention, by controlling the temperature range of preheating, molding and cooling, not only can the glass cover plates of different thicknesses be effectively processed into the expected 3D curved surface shape, but also defects such as breakage, mold imprint, convex spots and cracks can be significantly reduced.

[0026] Preferably, in step S3, before the hot bending forming process, the step further includes cutting and trimming the glass cover plates of unequal thicknesses.

[0027] The present invention also provides a 3D unequal thickness glass cover plate, which is obtained by processing using the above processing method.

[0028] Beneficial effects:

[0029] In the present invention, by first performing etching and thinning treatment and then performing hot bending and forming treatment, the process of preparing 3D unequal thickness glass cover plates can be simplified and the production cost can be reduced; at the same time, an innovative flow etching process is used to improve the yield, save costs, and increase production capacity. The R angles of the unequal thickness craters are uniform and smooth, the product craters have obvious three-dimensional effects, and the edges feel smooth. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the glass cover plates of unequal thickness as described in Example 1 being placed in a hot bending mold;

[0031] Figure 2 This is a schematic diagram of the finished product of the 3D glass cover plate of unequal thickness described in Example 1. DETAILED DESCRIPTION

[0032] The technical solutions of the present invention are described in detail below through specific embodiments. However, it should be clearly stated that these embodiments are for illustration only and are not to be construed as limiting the scope of the present invention.

[0033] Example 1

[0034] This embodiment provides a method for processing a 3D glass cover plate of unequal thickness, which specifically includes:

[0035] (1) Cutting a glass raw material with a thickness of 2 mm into a middle piece of 400×500 mm, cleaning it and using it as a glass cover plate, a crater position is preset on one surface of the glass cover plate, and a UV anti-viscosity film is adhered to the preset crater position;

[0036] (2) Fixing the edge of the glass cover plate with a clamp and placing it in an etching device, driving the glass cover plate to rotate while keeping the whole left and right swinging, spraying the etching liquid from a direction perpendicular to the surface of the glass cover plate to which the UV anti-viscosity film is adhered, the etching liquid temperature is 30° C., and the etching liquid includes, by weight percentage: 3% hydrofluoric acid, 30% ammonium fluoride, 8% hydrochloric acid, 2% nitrilotriacetic acid-based surfactant, and the remainder water, so that the surface of the glass cover plate except for the preset crater area is thinned until the glass cover plate is thinned to a thickness of 0.6 μm, thereby obtaining a glass cover plate of unequal thickness;

[0037] The preparation method of the above-mentioned nitrilotriacetic acid-based surfactant specifically comprises: adding nitrilotriacetic acid to dichloromethane, then adding an activator 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride with a mass of 3 times that of the nitrilotriacetic acid and a catalyst 4-dimethylaminopyridine with a mass of 1% of the nitrilotriacetic acid, stirring and mixing, adding n-octylamine with a mass of 3 times that of the nitrilotriacetic acid, stirring and reacting for 6 hours, and filtering to obtain intermediate 1; adding polyethylene glycol (PEG-400) with a mass of 50% of the nitrilotriacetic acid to anhydrous dioxane, heating to 60° C., adding pyridine with a mass of 50% of the polyethylene glycol and thionyl chloride with a mass of 1 times that of the polyethylene glycol, heating and refluxing for 2 hours, adding ice water, separating the liquids, and concentrating to obtain intermediate 2; dissolving intermediate 2 in dichloromethane, then adding triethylamine with a mass of 5% of the nitrilotriacetic acid and intermediate 1, heating and refluxing for 8 hours, and concentrating to obtain the nitrilotriacetic acid-based surfactant;

[0038] (3) The above-mentioned glass cover plates of different thicknesses were placed under 250 mJ / cm 2 Irradiate under ultraviolet light until the UV anti-viscosity film is peeled off from the glass cover plate, ultrasonically clean and dry, and then use a laser cutting machine to cut the shape and holes, with the laser energy of 70%, to obtain a glass cover plate of unequal thickness after trimming;

[0039] (4) The trimmed unequal thickness glass cover plate is placed in a hot bending mold cavity formed by a male mold and a female mold, and preheated first. The preheating temperatures are 710°C, 720°C, 730°C, 740°C, 750°C, 760°C, and 770°C, and the duration of each temperature point is 50s. Then, molding is performed. The molding temperatures are 730°C, 700°C, and 660°C, and the duration of each temperature point is 60s. The pressurization pressure in the molding stage is 100KG. Finally, cooling is performed. The cooling temperatures are 600°C, 500°C, and 400°C, and the duration of each temperature point is 50s. After cooling to room temperature, the mold is opened to obtain the 3D unequal thickness glass cover plate.

[0040] Figure 1 This is a schematic diagram of the structure of the glass cover plates of different thicknesses placed in the hot bending mold described in Example 1. Figure 2 This is a schematic diagram of the finished product of the 3D unequal thickness glass cover plate described in Example 1, referring to Figure 2 It can be seen that the crater has a significant three-dimensional effect and the edges feel smooth.

[0041] Example 2

[0042] The present embodiment provides a method for processing a 3D glass cover plate of unequal thickness, with specific reference to Embodiment 1, except that in step (2), the etching solution comprises, by weight percentage, 1% hydrofluoric acid, 35% ammonium fluoride, 5% hydrochloric acid, 3% nitrilotriacetic acid-based surfactant, and the remainder water, so that the surface of the glass cover plate except for the preset crater area is thinned until the glass cover plate is thinned to a thickness of 0.6 μm, thereby obtaining a glass cover plate of unequal thickness.

[0043] Example 3

[0044] The present embodiment provides a method for processing a 3D glass cover plate of unequal thickness, with specific reference to Embodiment 1, except that in step (2), the etching solution comprises, by weight percentage, 5% hydrofluoric acid, 5% ammonium fluoride, 10% hydrochloric acid, 0.5% nitrilotriacetic acid-based surfactant, and the remainder water, so that the surface of the glass cover plate except for the preset crater area is thinned until the glass cover plate is thinned to a thickness of 0.6 μm, thereby obtaining a glass cover plate of unequal thickness.

[0045] Comparative Example 1

[0046] This comparative example proposes a processing method for a 3D glass cover plate of unequal thickness. The specific method is referred to Example 1, except that in step (2), the etching solution includes, by weight percentage, 3% hydrofluoric acid, 30% ammonium fluoride, 8% hydrochloric acid, and the remainder water. In this way, the surface of the glass cover plate except for the preset crater area is thinned to obtain a glass cover plate of unequal thickness.

[0047] Comparative Example 2

[0048] This comparative example proposes a processing method for a 3D glass cover plate of unequal thickness. The specific method is referred to Example 1, except that in step (2), the etching solution comprises, by weight percentage, 3% hydrofluoric acid, 30% ammonium fluoride, 8% hydrochloric acid, 2% polyethylene glycol (PEG-400) and the remainder water, so that the surface of the glass cover plate except for the preset crater area is thinned to obtain a glass cover plate of unequal thickness.

[0049] The etching rate, thickness non-uniformity and actual effect of the 3D unequal thickness glass cover plates obtained in the examples and comparative examples were tested, and the results are shown in Table 1 below:

[0050] Table 1 Effect data of 3D unequal thickness glass cover plates in the embodiments and comparative examples

[0051]

[0052]

[0053] It can be seen from Table 1 above that the etching rate of the glass by the etching solution corresponding to the embodiment is greater than that of the comparative example, and the thickness non-uniformity and actual effect after etching are also better than those of the comparative example.

[0054] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for processing a 3D glass cover plate of unequal thickness, characterized in that: The steps include: S1. Covering a preset crater position on a surface of a glass cover plate with an acid-resistant protective layer; S2, performing an entire etching and thinning process on the surface of the glass cover plate covered with the acid-resistant protective layer, so that a crater structure higher than the surface is formed on the surface of the glass cover plate, thereby obtaining a glass cover plate of unequal thickness; S3, after peeling off the acid-resistant protective layer of the unequal thickness glass cover plate, performing a hot bending forming process, thus obtaining the 3D unequal thickness glass cover plate.

2. The processing method of the 3D unequal thickness glass cover plate according to claim 1, characterized in that: In step S1, the acid-resistant protective layer is obtained by adhering a UV viscosity-reducing film to a preset crater position of the glass cover plate.

3. The processing method of the 3D unequal thickness glass cover plate according to claim 1 or 2, characterized in that: In step S2, during the etching and thinning process, the glass cover plate rotates while keeping the overall left-right swing.

4. The processing method of the 3D unequal thickness glass cover plate according to claim 3, characterized in that: In step S2, during the etching and thinning process, the etching liquid is sprayed from a direction perpendicular to the surface of the glass cover plate covered with the acid-resistant protective layer, and the temperature of the etching liquid is 25-35°C.

5. The processing method of the 3D unequal thickness glass cover plate according to claim 4, characterized in that: The etching solution comprises, by weight percentage, 1-5% hydrofluoric acid, 5-35% ammonium fluoride, 5-10% inorganic acid, 0.5-3% nitrilotriacetic acid-based surfactant, and the balance water; Preferably, the nitrilotriacetic acid-based surfactant is obtained by condensing nitrilotriacetic acid with a long-chain alkylamine and polyethylene glycol.

6. The method for processing a 3D glass cover plate of unequal thickness according to any one of claims 1 to 5, characterized in that: In step S3, the acid-resistant protective layer is stripped by ultraviolet light.

7. The method for processing a 3D glass cover plate of unequal thickness according to any one of claims 1 to 6, characterized in that: In step S3, the hot bending forming is performed by placing the glass cover plates of different thicknesses in a cavity of a hot bending mold and sequentially performing preheating, forming, and cooling.

8. The method for processing a 3D glass cover plate of unequal thickness according to claim 7, characterized in that: The preheating temperature is 710-770°C, the molding temperature is 660-730°C, and the cooling temperature is 400-600°C.

9. The method for processing a 3D glass cover plate of unequal thickness according to claim 7 or 8, characterized in that: In step S3, before the hot bending forming process is performed, the glass cover plates of different thicknesses are cut and trimmed.

10. A 3D glass cover plate of unequal thickness, which is obtained by processing according to any one of claims 1 to 9.

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