A thinning solution for cover glass containing high rare earth elements, a thinning method and glass

Abstract

The present invention relates to the technical field of thinning cover glass containing high rare earth elements, particularly a thinning solution, thinning method, and glass for cover glass containing high rare earth elements. The solution comprises, by weight, 10-20 parts hydrofluoric acid, 10-20 parts ethyl acetate, 10-15 parts sulfuric acid, 5-10 parts ethanol, 10-15 parts perchloric acid, and 25-65 parts water. The hydrofluoric acid and ethyl acetate act together to erode the glass network, disintegrating it and thinning the glass. The addition of perchloric acid to the thinning solution effectively inhibits the formation of hydrogen fluoride and yttrium oxide or hydroxide, or partially dissolves the generated hydrogen fluoride and yttrium oxide or hydroxide, thereby inhibiting or significantly reducing the formation of white deposits and ensuring the transmittance of the thinned glass. Sulfuric acid acts as a catalyst, increasing the overall thinning speed. Finally, the combined action of ethyl acetate and ethanol produces a good glass surface, thereby avoiding problems such as flow mark defects and high surface roughness.

Description

Technical Field

[0001] The present invention relates to the technical field of thinning of high-rare-earth-element cover glass, and in particular to a thinning liquid for high-rare-earth-element cover glass, a thinning method and glass. Background Art

[0002] In order to enhance the hardness and toughness of the cover glass, high content of rare earth oxides such as yttrium oxide and lanthanum oxide is added to the new cover glass material.

[0003] The primary molding process for high-rare-earth element cover glass has high technical barriers, and no manufacturer in the industry currently has the capability to achieve mass production. However, due to the high barriers to entry for this method, mass production of high-rare-earth element cover glass can be achieved through a secondary molding process. This process primarily uses chemical thinning to reduce the original glass sheet, resulting in a high-strength, high-modulus cover glass that meets the required standards.

[0004] Compared to common glass, such as ordinary cover glass, thinning high-rare-earth element cover glass is more difficult. The thinning fluids currently disclosed in many publications are only suitable for ordinary glass. Directly applying one such thinning fluid to high-rare-earth element cover glass results in the appearance of a large amount of white deposits on the glass surface. EDS analysis reveals the main components, by weight, to be 50% F, 33% Y, and 4.2% Al. This is primarily due to the reaction of the common thinning fluid with the high-rare-earth element cover glass, where hydrogen fluoride reacts with yttrium oxide or yttrium hydroxide to form yttrium fluoride (Y(OH)₃+3HF→YF₃+3H₂O). Other thinning fluids react with high-rare-earth element cover glass to form insoluble complex salts containing NH₄F and YF₃, which cannot meet the thinning requirements for high-rare-earth element cover glass. This makes it unsuitable for use in components such as display screens and mobile phone covers. Summary of the Invention

[0005] Aiming at the problem that the glass thinning liquid in the prior art cannot meet the thinning requirements of high rare earth element cover glass, the present invention provides a thinning liquid for cover glass containing high rare earth elements and a thinning method.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The invention provides a thinning liquid for cover glass containing high rare earth elements, which comprises, by mass, 10-20 parts of hydrofluoric acid, 10-20 parts of ethyl acetate, 10-15 parts of sulfuric acid, 5-10 parts of ethanol, 10-15 parts of perchloric acid and 25-65 parts of water.

[0008] Preferably, the mixture comprises, by mass, 15 to 20 parts of hydrofluoric acid, 10 to 15 parts of ethyl acetate, 10 to 15 parts of sulfuric acid, 8 to 10 parts of ethanol, 10 to 15 parts of perchloric acid and 25 to 55 parts of water.

[0009] Preferably, by mass parts, it includes: 20 parts of hydrofluoric acid, 13 parts of ethyl acetate, 14 parts of sulfuric acid, 10 parts of ethanol, 12 parts of perchloric acid and 31 parts of water.

[0010] The present invention also provides a method for thinning a cover glass containing high rare earth elements by using the above-mentioned thinning liquid, including:

[0011] Prepare the thinning liquid according to mass components;

[0012] Perform pretreatment on the cover glass containing high rare earth elements to be thinned to obtain a cover glass original sheet containing high rare earth elements to be thinned;

[0013] Clean and dry the cover glass original sheet containing high rare earth elements to be thinned to obtain a pretreated cover glass containing high rare earth elements to be thinned;

[0014] Immerse the pretreated cover glass containing high rare earth elements to be thinned in the thinning liquid for chemical thinning until the pretreated cover glass containing high rare earth elements to be thinned reaches the target thickness, and complete the thinning.

[0015] Preferably, the cover glass containing high rare earth elements to be thinned, by mass, includes: 30% - 42% of SiO2, 20% - 40% of Y2O3, 8% - 16% of Al2O3 and 1% - 4% of B2O3.

[0016] Preferably, the method for performing pretreatment on the cover glass containing high rare earth elements to be thinned to obtain a cover glass original sheet containing high rare earth elements to be thinned is:

[0017] Precisely process, grind and polish the cover glass containing high rare earth elements to be thinned in sequence to obtain a cover glass original sheet containing high rare earth elements to be thinned.

[0018] Preferably, the method for cleaning and drying the cover glass original sheet containing high rare earth elements to be thinned to obtain a pretreated cover glass containing high rare earth elements to be thinned is:

[0019] Wash, dry the cover glass original sheet containing high rare earth elements to be thinned, then clean and dry it with a mixed acid solution, and wash and dry it with water again to obtain a pretreated cover glass containing high rare earth elements to be thinned.

[0020] Preferably, the mixed acid solution, by mass parts, includes: 10 - 15 parts of acetic acid, 10 - 15 parts of absolute ethanol and 70 - 80 parts of water.

[0021] Preferably, the temperature for chemical thinning is 45°C - 65°C.

[0022] A cover glass containing high rare earth elements is thinned by using the above-mentioned thinning method.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention provides a thinning solution for cover glass containing high rare earth elements, which includes, by mass parts: 10-20 parts of hydrofluoric acid, 10-20 parts of ethyl acetate, 10-15 parts of sulfuric acid, 5-10 parts of ethanol, 10-15 parts of perchloric acid, and 25-65 parts of water. Through the combined action of hydrofluoric acid and ethyl acetate, the glass network is eroded, causing the glass network to disintegrate and thinning the glass. By adding perchloric acid to the thinning solution, the generation of hydrogen fluoride and yttrium oxide or yttrium hydroxide can be effectively inhibited, or the generated hydrogen fluoride and yttrium oxide or yttrium hydroxide can be partially dissolved to inhibit or greatly reduce the generation of white attachments, thereby ensuring the transmittance of the thinned glass. Sulfuric acid can play a catalytic role to increase the overall thinning speed. Finally, under the combined action of ethyl acetate and ethanol, a good glass surface is obtained, thus avoiding problems such as flow mark defects and large glass surface roughness to meet the thinning requirements of cover glass containing high rare earth elements.

[0025] The thinning solution for cover glass containing high rare earth elements includes, by mass parts: 20 parts of hydrofluoric acid, 13 parts of ethyl acetate, 14 parts of sulfuric acid, 10 parts of ethanol, 12 parts of perchloric acid, and 31 parts of water. The thinning solution with this composition can ensure the performance of the glass surface when thinning the glass.

[0026] The present invention also provides a method for thinning cover glass containing high rare earth elements using the above-mentioned thinning solution. The method includes preparing the thinning solution, pre-treating, cleaning, and drying the cover glass containing high rare earth elements to be thinned to obtain the pre-treated cover glass containing high rare earth elements to be thinned; immersing the pre-treated cover glass containing high rare earth elements to be thinned in the thinning solution for chemical thinning until the pre-treated cover glass containing high rare earth elements to be thinned reaches the target thickness, thus completing the thinning. The method is simple and easy to operate, suitable for industrial thinning, and the glass surface performance after thinning is good, which can meet the thinning requirements of cover glass containing high rare earth elements.

[0027] The present invention also provides a cover glass containing high rare earth elements. After being thinned by the above-mentioned thinning method, there are no problems such as white attachments, flow mark defects, and large glass surface roughness on the glass surface, meeting the application requirements on components such as display screens and mobile phone covers. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic flow chart of a method for thinning cover glass containing high rare earth elements of the present invention.

[0029] Figure 2 It is a physical diagram of the cover glass containing high rare earth elements after thinning in Example 1 of the present invention.

[0030] Figure 3The physical diagram of the cover glass containing high rare earth elements after thinning for Comparative Example 1.

[0031] Figure 4 The transmittance comparison diagram of the cover glass containing high rare earth elements after thinning between the embodiments and comparative examples of the present invention. Detailed implementation manners

[0032] To enable those skilled in the art to understand the features and effects of the present invention, the following provides a general description and definition of the terms and phrases mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used herein shall have the ordinary meaning understood by those skilled in the art for the present invention. In case of conflicts, the definition in this specification shall prevail.

[0033] The theories or mechanisms described and disclosed herein, whether correct or incorrect, shall not limit the scope of the present invention in any way, that is, the content of the present invention can be implemented without being limited by any specific theory or mechanism.

[0034] In this article, all features defined in the form of numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are only for the sake of brevity and convenience. Accordingly, the description of numerical ranges or percentage ranges should be regarded as having covered and specifically disclosed all possible sub-ranges and individual numerical values (including integers and fractions) within the range.

[0035] In this article, unless otherwise specified, "comprising", "including", "containing", "having" or similar terms cover the meanings of "consisting of" and "consisting essentially of". For example, "A comprises a" covers the meanings of "A comprises a and others" and "A only comprises a".

[0036] In this article, for the sake of concise description, all possible combinations of all technical features in each embodiment or example are not described. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each embodiment or example can be combined arbitrarily, and all possible combinations should be considered as the scope described in this specification.

[0037] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0038] In the following examples, conventional instruments and equipment in the art are used. For the experimental methods without specific conditions noted in the following examples, they are generally carried out under conventional conditions or according to the conditions recommended by the manufacturer. In the following examples, various raw materials are used, and unless otherwise specified, commercially available products are used, and their specifications are conventional specifications in the art. In the specification of the present invention and the following examples, unless otherwise specified, "%" represents weight percentage, "parts" represents weight parts, and the ratio represents weight ratio.

[0039] The present invention will be further described in detail below with reference to specific examples, which are explanations of the present invention rather than limitations.

[0040] The present invention discloses a thinning solution for cover glass containing high rare earth elements, which includes, by mass parts: 10-20 parts of hydrofluoric acid, 10-20 parts of ethyl acetate, 10-15 parts of sulfuric acid, 5-10 parts of ethanol, 10-15 parts of perchloric acid, and 25-65 parts of water.

[0041] Preferably, the thinning solution for cover glass containing high rare earth elements includes, by mass parts: 15-20 parts of hydrofluoric acid, 10-15 parts of ethyl acetate, 10-15 parts of sulfuric acid, 8-10 parts of ethanol, 10-15 parts of perchloric acid, and 25-55 parts of water. More preferably, it includes, by mass parts: 20 parts of hydrofluoric acid, 13 parts of ethyl acetate, 14 parts of sulfuric acid, 10 parts of ethanol, 12 parts of perchloric acid, and 31 parts of water.

[0042] See Figure 1 , the present invention provides a method for thinning cover glass containing high rare earth elements using the above-mentioned thinning solution, including:

[0043] S1: Prepare the thinning solution according to the mass components, specifically:

[0044] Mix 10-20 parts of hydrofluoric acid, 10-20 parts of ethyl acetate, 10-15 parts of sulfuric acid, 5-10 parts of ethanol, 10-15 parts of perchloric acid, and 25-65 parts of water evenly by mass parts to obtain the thinning solution;

[0045] S2: Pretreat the cover glass containing high rare earth elements to be thinned to obtain the original sheet of the cover glass containing high rare earth elements to be thinned. The cover glass containing high rare earth elements to be thinned includes, by mass: 30%-42% of SiO2, 20%-40% of Y2O3, 8%-16% of Al2O3, and 1%-4% of B2O3.

[0046] Specifically:

[0047] Precisely process, grind, and polish the cover glass containing high rare earth elements to be thinned in sequence to obtain the original sheet of the cover glass containing high rare earth elements to be thinned;

[0048] S3: Clean and dry the original cover glass containing high rare earth elements to be thinned to obtain the pre-treated cover glass containing high rare earth elements to be thinned. Specifically:

[0049] Wash the original cover glass containing high rare earth elements to be thinned with water, dry it, then clean it with a mixed acid solution and dry it, and then wash it with water again and dry it to obtain the pre-treated cover glass containing high rare earth elements to be thinned; the mixed acid solution includes, by mass: 10 - 15 parts of acetic acid, 10 - 15 parts of anhydrous ethanol, and 70 - 80 parts of water; the mixed acid solution can effectively remove the substances attached to the glass surface generated by grinding and polishing the cover glass containing high rare earth elements, and while cleaning the surface, it promotes uniform reaction on the glass surface.

[0050] S4: Immerse the pre-treated cover glass containing high rare earth elements to be thinned in a thinning solution for chemical thinning until the pre-treated cover glass containing high rare earth elements to be thinned reaches the target thickness, and the thinning is completed. Specifically: Immerse the pre-treated cover glass containing high rare earth elements to be thinned in the thinning solution, and carry out thinning at 45°C - 65°C for 1.5 - 2.5 h.

[0051] Example 1

[0052] Mix 20 parts of hydrofluoric acid, 13 parts of ethyl acetate, 14 parts of sulfuric acid, 10 parts of ethanol, 12 parts of perchloric acid, and 31 parts of water evenly according to weight.

[0053] Process the original cover glass containing high rare earth elements into a 6-inch original cover glass containing high rare earth elements with a thickness of 400 μm through CNC (Computerized Numerical Control), grinding, and polishing.

[0054] First, wash and dry the ground and polished original cover glass containing high rare earth elements with purified water, then clean it with a mixed acid solution for 5 minutes, and finally clean it with purified water and dry it to obtain the pre-treated cover glass containing high rare earth elements to be thinned; among them, the mixed acid solution includes, by weight: 10 parts of acetic acid, 10 parts of anhydrous ethanol, and 80 parts of water;

[0055] Immerse the 400-μm-thick pre-treated cover glass containing high rare earth elements to be thinned in the thinning solution, the temperature of the thinning solution is 45°C, and the chemical thinning time is 2.5 h;

[0056] After washing and drying the thinned cover glass containing high rare earth elements, a 30-μm cover glass containing high rare earth elements is obtained. For the physical diagram of the cover glass containing high rare earth elements obtained in this example, see Figure 2 It can be seen that there are no white attachments on the surface of the cover glass containing high rare earth elements, and it is smooth and delicate.

[0057] Example 2

[0058] According to weight parts, 15 parts of hydrofluoric acid, 15 parts of ethyl acetate, 15 parts of sulfuric acid, 10 parts of ethanol, 10 parts of perchloric acid and 35 parts of water were mixed uniformly.

[0059] The high rare earth element cover glass original sheet is processed by CNC, ground and polished to produce a 6-inch high rare earth element cover glass original sheet with a thickness of 400um.

[0060] The ground and polished high rare earth element cover glass original sheet is first washed with purified water and dried, then washed with a mixed acid solution for 5 minutes, and finally rinsed with purified water and dried to obtain a pre-treated high rare earth element cover glass to be thinned; wherein the mixed acid solution comprises, in parts by weight, 10 parts of acetic acid, 10 parts of anhydrous ethanol, and 80 parts of water;

[0061] The 400 μm thick pre-treated cover glass containing high rare earth elements to be thinned was immersed in a thinning solution with a temperature of 50°C and a chemical thinning time of 2.5 h.

[0062] The thinned high rare earth element cover glass was cleaned and dried to obtain a 30 μm high rare earth element cover glass. The surface of the high rare earth element cover glass obtained in this embodiment was smooth and fine without any white attachments.

[0063] Example 3

[0064] According to weight parts, 15 parts of hydrofluoric acid, 10 parts of ethyl acetate, 12 parts of sulfuric acid, 9 parts of ethanol, 3 parts of perchloric acid and 51 parts of water were mixed uniformly.

[0065] The high rare earth element cover glass original sheet is processed by CNC, ground and polished to produce a 6-inch high rare earth element cover glass original sheet with a thickness of 400um.

[0066] The ground and polished high rare earth element cover glass original sheet is first washed with purified water and dried, then washed with a mixed acid solution for 5 minutes, and finally rinsed with purified water and dried to obtain a pre-treated high rare earth element cover glass to be thinned; wherein the mixed acid solution comprises, in parts by weight, 12 parts of acetic acid, 13 parts of anhydrous ethanol, and 75 parts of water;

[0067] The 400 μm thick pre-treated cover glass containing high rare earth elements to be thinned was immersed in a thinning solution with a temperature of 50°C and a chemical thinning time of 2.5 h.

[0068] The thinned high rare earth element cover glass was cleaned and dried to obtain a 30 μm high rare earth element cover glass. The surface of the high rare earth element cover glass obtained in this embodiment was smooth and fine without any white attachments.

[0069] Example 4

[0070] According to weight parts, 16 parts of hydrofluoric acid, 14 parts of ethyl acetate, 10 parts of sulfuric acid, 7 parts of ethanol, 13 parts of perchloric acid and 40 parts of water were mixed uniformly.

[0071] The high rare earth element cover glass original sheet is processed by CNC, ground and polished to produce a 6-inch high rare earth element cover glass original sheet with a thickness of 400um.

[0072] The ground and polished high rare earth element cover glass original sheet is first washed with purified water and dried, then washed with a mixed acid solution for 5 minutes, and finally rinsed with purified water and dried to obtain a pre-treated high rare earth element cover glass to be thinned; wherein the mixed acid solution comprises, in parts by weight, 10 parts of acetic acid, 10 parts of anhydrous ethanol, and 80 parts of water;

[0073] The 400 μm thick pre-treated cover glass containing high rare earth elements to be thinned was immersed in a thinning solution with a temperature of 46°C and a chemical thinning time of 2 h.

[0074] The thinned high rare earth element cover glass was cleaned and dried to obtain a 30 μm high rare earth element cover glass. The surface of the high rare earth element cover glass obtained in this embodiment was smooth and fine without any white attachments.

[0075] Comparative Example 1

[0076] 10 parts of hydrofluoric acid, 10 parts of ammonium fluoride, 9 parts of citric acid, 13 parts of oxalic acid and 58 parts of water were mixed uniformly by mass to obtain a thinning solution.

[0077] The high rare earth element cover glass original sheet is processed by CNC, grinding and polishing to produce a 6-inch high rare earth element cover glass original sheet with a thickness of 400um.

[0078] The ground and polished high rare earth element cover glass original sheet is first washed with purified water and dried, then washed with a mixed acid solution for 5 minutes, and finally rinsed with purified water and dried to obtain a pre-treated high rare earth element cover glass to be thinned; wherein the mixed acid solution comprises, in parts by weight, 10 parts of acetic acid, 10 parts of anhydrous ethanol, and 80 parts of water;

[0079] The 400 μm thick pre-treated cover glass containing high rare earth elements to be thinned was immersed in a thinning solution with a temperature of 50°C and a chemical thinning time of 2.5 h.

[0080] After cleaning and drying the thinned high rare earth element cover glass, a 30μm high rare earth element cover glass is obtained. Figure 3, it can be seen from the physical picture of the high-rare-earth element cover glass obtained in this comparative example that white attachments are generated on the surface of the high-rare-earth element cover glass, which cannot be applied to display screens and mobile phone covers.

[0081] Comparative Example 2

[0082] Mix 12 parts of hydrofluoric acid, 8 parts of ammonium fluoride, 9 parts of citric acid, 13 parts of oxalic acid and 58 parts of water by mass to obtain a thinning solution.

[0083] Manufacture a 6-inch high-rare-earth element cover glass substrate with a thickness of 400 μm by subjecting the high-rare-earth element cover glass substrate to CNC, grinding and polishing.

[0084] First, wash and dry the polished high-rare-earth element cover glass substrate with purified water, then wash it with a mixed acid solution for 5 minutes, and finally wash it clean with purified water and dry it to obtain a pre-treated high-rare-earth element cover glass to be thinned; wherein, the mixed acid solution includes, by weight: 10 parts of acetic acid, 10 parts of anhydrous ethanol and 80 parts of water;

[0085] Immerse the 400-μm thick pre-treated high-rare-earth element cover glass to be thinned in the thinning solution at a temperature of 50 °C for 2.5 h for chemical thinning;

[0086] After washing and drying the thinned high-rare-earth element cover glass, a 30-μm high-rare-earth element cover glass is obtained. White attachments are generated on the surface of the high-rare-earth element cover glass obtained in this comparative example, which cannot be applied to display screens and mobile phone covers.

[0087] Comparative Example 3

[0088] Mix 16 parts of hydrofluoric acid, 4 parts of ammonium fluoride, 9 parts of citric acid, 13 parts of oxalic acid and 58 parts of water by mass to obtain a thinning solution.

[0089] Manufacture a 6-inch high-rare-earth element cover glass substrate with a thickness of 400 μm by subjecting the high-rare-earth element cover glass substrate to CNC, grinding and polishing.

[0090] First, wash and dry the polished high-rare-earth element cover glass substrate with purified water, then wash it with a mixed acid solution for 5 minutes, and finally wash it clean with purified water and dry it to obtain a pre-treated high-rare-earth element cover glass to be thinned; wherein, the mixed acid solution includes, by weight: 10 parts of acetic acid, 10 parts of anhydrous ethanol and 80 parts of water;

[0091] Immerse the 400-μm thick pre-treated high-rare-earth element cover glass to be thinned in the thinning solution at a temperature of 50 °C for 2.5 h for chemical thinning;

[0092] The thinned high rare earth element cover glass was cleaned and dried to obtain a 30 μm high rare earth element cover glass. The soft high rare earth element cover glass obtained in this comparative example had white attachments on its surface and could not be used for display screens and mobile phone covers.

[0093] The transmittance of the high rare earth element cover glass obtained in the above examples and comparative examples was tested, and the detection method and test results are as follows:

[0094] The glass transmittance was tested using a German Jena SPECORD50f spectrophotometer at a wavelength of 550nm. The results are as follows:

[0095] Cover glass with high rare earth elements Transmittance (%) Original sheet of cover glass with high rare earth elements 88.80 Example 1 87.06 Example 2 86.72 Example 3 86.6 Example 4 86.7 Comparative example 1 52.58 Comparative example 2 55.99 Comparative example 3 59.93

[0096] See also Figure 4 A comparison of the transmittance of the high-rare-earth-element cover glass prepared in the Example and the Comparative Example shows that the transmittance of the glass thinned with the thinning fluid prepared in the present invention is almost unchanged compared to the original glass, demonstrating that the glass thinned with the thinning fluid of the present invention maintains its surface properties. In contrast, the transmittance of the high-rare-earth-element cover glass prepared in the Comparative Example, thinned with the existing thinning fluid, is significantly reduced, severely impacting subsequent applications of the glass.

[0097] The present invention also provides a cover glass containing high rare earth elements, which is thinned using the above-mentioned thinning method. After thinning, the glass surface is free of white attachments, flow mark-like defects, and high glass surface roughness, meeting the application requirements in components such as display screens and mobile phone covers.

[0098] In summary, the present invention provides a thinning liquid, thinning method, and glass for cover glass containing high rare earth elements. The thinning process involves the combined action of hydrofluoric acid and ethyl acetate to erode the glass network, disintegrating it and achieving thinning. The addition of perchloric acid to the thinning liquid effectively inhibits the formation of hydrogen fluoride and yttrium oxide or hydroxide, or partially dissolves the generated hydrogen fluoride and yttrium oxide or hydroxide, thereby inhibiting or significantly reducing the formation of white deposits and ensuring the transmittance of the thinned glass. Sulfuric acid catalyzes the thinning process, accelerating the overall thinning rate. Finally, the combined action of ethyl acetate and ethanol produces a superior glass surface, avoiding flow mark defects and excessive surface roughness, thereby meeting the thinning requirements for cover glass containing high rare earth elements.

[0099] The above description is merely a preferred embodiment of the present invention and is not intended to impose any limitation on the technical solution of the present invention. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can also be subjected to several simple modifications and replacements, and these modifications and replacements are also within the scope of protection covered by the claims.

Claims

1. A thinning liquid for cover glass containing high rare earth elements, characterized in that, It comprises, by mass parts: 10 - 20 parts of hydrofluoric acid, 10 - 20 parts of ethyl acetate, 10 - 15 parts of sulfuric acid, 5 - 10 parts of ethanol, 10 - 15 parts of perchloric acid, and 25 - 65 parts of water.

2. The thinning liquid for cover glass containing high rare earth elements according to claim 1, wherein, It comprises, by mass parts: 15 - 20 parts of hydrofluoric acid, 10 - 15 parts of ethyl acetate, 10 - 15 parts of sulfuric acid, 8 - 10 parts of ethanol, 10 - 15 parts of perchloric acid, and 25 - 55 parts of water.

3. The thinning liquid for high rare earth element-containing cover glass according to claim 1 or 2, characterized in that, It comprises, by mass parts: 20 parts of hydrofluoric acid, 13 parts of ethyl acetate, 14 parts of sulfuric acid, 10 parts of ethanol, 12 parts of perchloric acid, and 31 parts of water.

4. A method for thinning a cover glass containing high rare earth elements using the thinning liquid according to any one of claims 1 to 3, characterized in that, It comprises: Prepare the thinning solution according to mass components; Perform pretreatment on the cover glass containing high rare earth elements to be thinned to obtain the original cover glass containing high rare earth elements to be thinned. Clean and dry the original cover glass containing high rare earth elements to be thinned to obtain the pretreated cover glass containing high rare earth elements to be thinned. Immerse the pretreated cover glass containing high rare earth elements to be thinned in the thinning solution for chemical thinning until the pretreated cover glass containing high rare earth elements to be thinned reaches the target thickness, and the thinning is completed.

5. The thinning method of the cover glass containing high rare earth elements according to claim 4, characterized in that, The cover glass containing high rare earth elements to be thinned comprises, by mass: 30% - 42% of SiO2, 20% - 40% of Y2O3, 8% - 16% of Al2O3, and 1% - 4% of B2O3.

6. The thinning method of the cover glass containing high rare earth elements according to claim 4, characterized in that, The method for performing pretreatment on the cover glass containing high rare earth elements to be thinned to obtain the original cover glass containing high rare earth elements to be thinned is: Precisely process, grind, and polish the cover glass containing high rare earth elements to be thinned in sequence to obtain the original cover glass containing high rare earth elements to be thinned.

7. The thinning method of the cover glass containing high rare earth elements according to claim 4, characterized in that The method for cleaning and drying the original cover glass containing high rare earth elements to be thinned to obtain the pretreated cover glass containing high rare earth elements to be thinned is: Wash the original cover glass containing high rare earth elements to be thinned with water and dry it, then clean it with a mixed acid solution and dry it, and wash it with water again and dry it to obtain the pretreated cover glass containing high rare earth elements to be thinned.

8. The thinning method of the cover glass containing high rare earth elements according to claim 7, characterized in that, The mixed acid solution comprises, by mass parts: 10 - 15 parts of acetic acid, 10 - 15 parts of absolute ethanol, and 70 - 80 parts of water.

9. The thinning method of the cover glass containing high rare earth elements according to claim 4, characterized in that, The temperature for chemical thinning is 45°C - 65°C.

10. A cover glass containing high rare earth elements, characterized in that, Thin by using the thinning method described in any one of claims 4 - 9.

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