A processing method of 3D glass cover plate with unequal thickness and 3D glass cover plate with unequal thickness

Abstract

The application provides a processing method of a 3D glass cover plate with different thicknesses and the 3D glass cover plate, and the processing method comprises the following steps: covering a preset crater position on a surface of a glass cover plate with an acid-resistant protective layer; performing surface etching thinning treatment on the surface of the glass cover plate covered with the acid-resistant protective layer, forming a crater structure protruding from the surface on the surface of the glass cover plate, and obtaining a glass cover plate with different thicknesses; and after stripping the acid-resistant protective layer of the glass cover plate with different thicknesses, performing hot bending forming treatment, so that the 3D glass cover plate with different thicknesses is obtained. The processing method of the 3D glass cover plate with different thicknesses and the 3D glass cover plate are as follows: the surface of the glass cover plate except the preset crater position is integrally thinned through etching thinning treatment, a crater structure is obtained, and then the glass cover plate is made into a curved surface structure through hot bending forming treatment, so that the 3D glass cover plate with different thicknesses is obtained.

Description

Technical Field

[0001] This invention relates to the field of 3D glass processing technology, and in particular to a processing method for 3D glass cover plates with unequal thickness and a 3D glass cover plate with unequal thickness. Background Technology

[0002] 3D unequal thickness glass cover has two meanings. First, it has a 3D structure, which generally refers to the glass body plane with obtuse angles on both sides and four sides. Its manufacturing process mainly includes hot bending, which belongs to precision forming technology. Second, it has a crater structure on its surface. The so-called crater structure refers to the raised shape of the camera hole position on the glass cover. Because the crater surface is higher than the rest of the surface, this type of glass cover is also called unequal thickness glass cover.

[0003] Currently, in the traditional 3D uneven thickness glass cover molding process, holes are made in the glass surface, and the shape of a volcano is formed by hot bending. Since the volcano needs to be bent and material is added around it, it is easy to cause material shortage around the volcano, which will affect the final structure of the molded product, resulting in poor product shape, failure to form properly, and easy collapse of the edge. At the same time, the shape, surface and hole diameter of the volcano after molding have large errors and lack three-dimensionality. Summary of the Invention

[0004] Based on the technical problems existing in the background art, the present invention proposes a processing method for 3D unequal thickness glass cover plates and a 3D unequal thickness glass cover plate. First, the glass cover plate is thinned as a whole except for the preset crater position by etching thinning process to obtain crater structure. Then, the glass cover plate is made into a curved structure by hot bending forming process, thus obtaining the 3D unequal thickness glass cover plate.

[0005] The present invention proposes a method for processing 3D glass cover plates with unequal thickness, comprising the following steps:

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

[0007] S2. The surface of the glass cover plate covered with the acid-resistant protective layer is etched and thinned to form a crater structure that protrudes from the surface, resulting in a glass cover plate of unequal thickness.

[0008] S3. After peeling off the acid-resistant protective layer of the unequal thickness glass cover, hot bending forming process is performed to obtain the 3D unequal thickness glass cover.

[0009] In this invention, an acid-resistant protective layer is first applied to a pre-defined crater location on one surface of the glass cover plate to shield and protect the crater location. Then, the entire surface of the glass cover plate is etched and thinned, thereby achieving a large-area thinning of this surface except for the pre-defined crater location. This objectively forms a 2D unequal-thickness glass with a crater structure. Subsequently, a hot bending forming process is performed. The 2D unequal-thickness glass is heated and softened, and after being formed in a mold, it forms a 3D curved shape, thus obtaining the 3D unequal-thickness glass cover plate.

[0010] The above-mentioned processing method of the present invention can directly obtain the desired unequal thickness crater structure by etching and thinning. It overcomes the defects of the existing technology that forms craters by hot bending process, resulting in poor product shape, inability to form properly, easy collapse of edges and lack of three-dimensionality. The 3D unequal thickness glass cover plate is prepared without micro-cracks, without grinding, polishing and repair processing. The R-angle of the unequal thickness crater is uniform and smooth, the three-dimensional effect of the crater is obvious, 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 anti-adhesion film to a predetermined crater position on the glass cover plate.

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

[0013] Preferably, the glass cover plate swings left and right at a frequency of 10-15Hz and rotates at a speed of 5-10Hz.

[0014] In this invention, etching is performed while maintaining both swaying and rotation. On the one hand, this avoids the defect of greatly reduced etching efficiency caused by prolonged standing of the glass etching solution in the etching solution. On the other hand, it also avoids etching residue covering the surface of the glass cover plate, which would not only reduce etching efficiency but also cause unevenness on the etched surface and very limited etching depth.

[0015] Compared to the commercially available process of cold carving large areas of glass cover plates using machining, followed by grinding with a CNC machine and corresponding grinding head, this method not only has certain equipment requirements and requires matching grinding heads of the appropriate specifications, but also involves a long processing step, and the crater position cannot be formed properly, easily causing edge collapse. Furthermore, it causes many defects in the product during the manufacturing process, affecting the yield rate. In this invention, thinning is achieved through flow etching, which not only ensures the etching depth but also overcomes the defects of machining methods in preparing crater structures, such as the inability to form the crater position properly, easy edge collapse, and low yield rate.

[0016] Preferably, in step S2, during the etching and thinning process, the etching solution 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 solution is 25-35℃.

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

[0018] In this invention, an etching solution is sprayed perpendicularly to the surface of the glass cover to etch the glass cover that is swinging and rotating from side to side, ultimately obtaining the required crater of unequal thickness, as well as the required bottom R angle and the width of the crater's arc edge.

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

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

[0021] In this invention, hydrofluoric acid and fluoride salts are the main components for etching the glass surface. Inorganic acids promote the cleaning and etching of the glass cover. The nitrogen-based triacetic acid surfactant is obtained by condensing nitrogen-based triacetic acid with long-chain alkylamines and polyethylene glycol. Its hydrophilic polyether chain structure and hydrophobic long-chain alkyl structure easily form micelles, thereby encapsulating the insoluble products generated during etching, making them easier to dissolve in water. This prevents the etching products from adhering to the glass cover surface, improves the etching rate and etching effect, and increases the etching depth of the large surface area of ​​the glass cover.

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

[0023] Preferably, in step S3, the hot bending process involves placing the glass cover plate of unequal thickness in the cavity of a hot bending mold, preheating, shaping, and cooling sequentially.

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

[0025] In this invention, by controlling the temperature range of preheating, molding, and cooling, not only can the glass cover plate of unequal thickness be effectively processed into the expected 3D curved surface shape, but defects such as breakage, molding, bumps, and cracks are also significantly reduced.

[0026] Preferably, in step S3, before performing the hot bending process, the uneven thickness glass cover plate is further cut and trimmed.

[0027] This invention also proposes a 3D glass cover plate with unequal thickness, which is processed by the above-mentioned processing method.

[0028] Beneficial effects:

[0029] In this invention, by first performing etching to thin the glass and then hot bending to form it, the process of preparing 3D glass covers with unequal thickness can be simplified and the production cost reduced. At the same time, the innovative flow etching process improves the yield, saves costs, increases production capacity, and produces uniform and smooth crater radius corners with unequal thickness, resulting in a clear three-dimensional crater effect and smooth edges. Attached Figure Description

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

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

[0032] The technical solution of the present invention will be described in detail below through specific embodiments. However, it should be clearly stated that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0033] Example 1

[0034] This embodiment proposes a processing method for 3D glass cover plates with unequal thickness, specifically including:

[0035] (1) Cut a 2mm thick glass material into 400×500mm medium pieces, clean them and use them as glass cover plates. A crater position is preset on one surface of the glass cover plate, and the UV anti-adhesion film is adhered to the preset crater position.

[0036] (2) After fixing the edge of the glass cover plate with a clamp, place it in the etching equipment and drive the glass cover plate to rotate while maintaining the overall left and right swing. The etching solution is sprayed from the direction perpendicular to the surface of the glass cover plate with the UV anti-adhesion film. The temperature of the etching solution is 30°C. The etching solution includes the following by weight percentage: 3% hydrofluoric acid, 30% ammonium fluoride, 8% hydrochloric acid, 2% nitrogen-based triacetic acid surfactant, and the balance water. In this way, 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 0.6μm, and an uneven thickness glass cover plate is obtained.

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

[0038] (3) The above-mentioned glass cover plates of unequal thickness are subjected to a temperature of 250 mJ / cm. 2 The UV anti-adhesion film is peeled off from the glass cover under ultraviolet light, ultrasonically cleaned, dried, and then the shape and holes are cut by a laser cutting machine with a laser energy of 70% to obtain a glass cover with uneven thickness after trimming.

[0039] (4) Place the trimmed glass cover plate of unequal thickness into the hot bending mold cavity formed by the cooperation of the punch and the die. First, preheat it. The preheating temperature is 710℃, 720℃, 730℃, 740℃, 750℃, 760℃ and 770℃ respectively. The duration of each temperature point is 50s. Then, form it. The forming temperature is 730℃, 700℃ and 660℃ respectively. The duration of each temperature point is 60s. The pressure during the forming stage is 100KG. Finally, cool it. The cooling temperature is 600℃, 500℃ and 400℃ respectively. The duration of each temperature point is 50s. After cooling to room temperature, open the mold to obtain the 3D glass cover plate of unequal thickness.

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

[0041] Example 2

[0042] This embodiment proposes a processing method for 3D glass cover plates with unequal thickness. Specifically, referring to Embodiment 1, except that in step (2), the etching solution includes, by weight percentage: 1% hydrofluoric acid, 35% ammonium fluoride, 5% hydrochloric acid, 3% nitrogen-based triacetic acid surfactant, and the remainder water. In this way, 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, thus obtaining a glass cover plate with unequal thickness.

[0043] Example 3

[0044] This embodiment proposes a processing method for 3D glass cover plates with unequal thickness. Specifically, referring to Embodiment 1, except that in step (2), the etching solution includes, by weight percentage: 5% hydrofluoric acid, 5% ammonium fluoride, 10% hydrochloric acid, 0.5% nitrogen-based triacetic acid surfactant, and the remainder water. In this way, 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, thus obtaining a glass cover plate with unequal thickness.

[0045] Comparative Example 1

[0046] This comparative example proposes a processing method for a 3D glass cover plate with unequal thickness. The specific method is as described in Example 1. Except in step (2), the etching solution includes, by weight percentage: 3% hydrofluoric acid, 30% ammonium fluoride, 8% hydrochloric acid, and the remainder water. This thins the surface of the glass cover plate except for the preset crater area, thus obtaining a glass cover plate with unequal thickness.

[0047] Comparative Example 2

[0048] This comparative example proposes a processing method for a 3D glass cover plate with unequal thickness. The specific method is as described in Example 1. Except in step (2), the etching solution includes, by weight percentage: 3% hydrofluoric acid, 30% ammonium fluoride, 8% hydrochloric acid, 2% polyethylene glycol (PEG-400), and the balance water. This thins the surface of the glass cover plate except for the preset crater area, thus obtaining a glass cover plate with unequal thickness.

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

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

[0051]

[0052]

[0053] As shown in Table 1 above, the etching rate of the glass etched by the etching solution in the embodiment is greater than that in the comparative example, and the non-uniformity of the etched thickness and the actual effect are also better than those in the comparative example.

[0054] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for processing 3D glass cover plates of unequal thickness, characterized in that, Includes the following steps: S1. Cover the preset crater position on one surface of the glass cover plate with an acid-resistant protective layer; S2. The surface of the glass cover plate covered with the acid-resistant protective layer is etched and thinned to form a crater structure that protrudes from the surface, resulting in a glass cover plate of unequal thickness. S3. After peeling off the acid-resistant protective layer of the unequal thickness glass cover, hot bending forming process is performed to obtain the 3D unequal thickness glass cover. During the etching and thinning process, the etching solution is sprayed from a direction perpendicular to the surface of the glass cover plate that is covered with an acid-resistant protective layer. The etching solution comprises, by weight percentage: 1-5% hydrofluoric acid, 5-35% ammonium fluoride, 5-10% inorganic acid, 0.5-3% nitrogen-based triacetic acid surfactant, and the balance being water; The nitrogen-based triacetic acid surfactant is prepared by the following method: Nitrotriacetic acid (NTA) was added to dichloromethane, followed by 3 times the mass of NTA activator 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and 1% of the mass of NTA catalyst 4-dimethylaminopyridine. After stirring and mixing, 3 times the mass of NTA n-octylamine was added, and the mixture was stirred and reacted for 6 hours. After filtration, intermediate 1 was obtained. 50% of the mass of NTA polyethylene glycol PEG-400 was added to anhydrous dioxane, and the mixture was heated to 60°C. 50% of the mass of NTA pyridine and 1 times the mass of NTA thionyl chloride were added, and the mixture was refluxed for 2 hours. Ice water was added, and the mixture was separated and concentrated to obtain intermediate 2. Intermediate 2 was dissolved in dichloromethane, followed by 5% of the mass of NTA triethylamine and intermediate 1. The mixture was refluxed for 8 hours and then concentrated to obtain the NTA-based surfactant.

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 anti-adhesion film to a preset crater position on 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 itself while maintaining its 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, the temperature of the etching solution is 25-35℃.

5. The processing method of the 3D unequal thickness glass cover plate according to claim 1 or 2, characterized in that, In step S3, the acid-resistant protective layer is peeled off by ultraviolet light.

6. The processing method of the 3D unequal thickness glass cover plate according to claim 1 or 2, characterized in that, In step S3, the hot bending process involves placing the glass cover plate of unequal thickness in the cavity of a hot bending mold, preheating, shaping, and cooling it sequentially.

7. The processing method of the 3D unequal thickness glass cover plate according to claim 6, characterized in that, The preheating temperature is 710-770℃, the molding temperature is 660-730℃, and the cooling temperature is 400-600℃.

8. The processing method of the 3D unequal thickness glass cover plate according to claim 6, characterized in that, In step S3, before the hot bending process, the uneven thickness glass cover plate is cut and trimmed.

9. A 3D glass cover plate with unequal thickness, which is processed by the processing method described in any one of claims 1-8.

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