Glass strengthening composition, glass strengthening method, float high-alumina electronic glass

Abstract

The application relates to a glass strengthening composition, a glass strengthening method and a float high-aluminum electronic glass. The glass strengthening composition provided by the application is obtained by reasonably controlling the component contents of hydrofluoric acid, a first inorganic acid, an auxiliary agent and a first solvent, and selecting specific types of the first inorganic acid and the auxiliary agent. On one hand, the first inorganic acid can effectively dissolve fluorosilicate generated after the hydrofluoric acid corrodes the microcracks of the glass, thereby effectively avoiding the adhesion of the fluorosilicate to the glass, ensuring the transparency of the strengthened glass and preventing the glass from being hazy. In addition, the application further adds a water-soluble auxiliary agent, so that the water-soluble auxiliary agent can react with fluorosilicate to generate acid, thereby further prolonging the service life of the composition, and when the glass strengthening composition provided by the application is used as a secondary strengthening liquid for glass, the impact resistance of the strengthened glass can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of glass, specifically to glass strengthening compositions, glass strengthening methods, and float high-alumina electronic glass. Background Technology

[0002] With social development and technological advancements, glass is widely used in industrial production and daily life, leading to increasingly higher demands for its strength and appearance. Currently, the main method to improve glass strength is to immerse float glass in a molten solution containing a high concentration of potassium, causing potassium and sodium ions on the glass surface to exchange and form a strengthening layer. Although the strength of the strengthened glass is doubled compared to the original material, microcracks formed before strengthening still exist after the first strengthening process, resulting in poor impact resistance (impact energy approximately 0.5 J).

[0003] To address the issue of poor impact resistance in glass after primary strengthening, secondary strengthening solutions are commonly used. These solutions primarily consist of hydrofluoric acid strengthening solutions, which contain only hydrofluoric acid. This causes the fluorosilicates formed by the reaction of hydrofluoric acid with the glass to adhere to the glass surface, resulting in a hazy appearance. Summary of the Invention

[0004] Based on this, this application provides a glass strengthening composition, a glass strengthening method, and float high-alumina electronic glass. The glass strengthening composition provided in this application can be used as a secondary strengthening liquid for glass, enabling the strengthened glass to possess both excellent impact resistance and clear, non-cloudy transparency.

[0005] A first aspect of this application provides a glass strengthening composition comprising, by weight percentage: 2.5% to 15% hydrofluoric acid, 10% to 30% a first inorganic acid, 3% to 15% an auxiliary agent, and 40% to 84.5% a first solvent;

[0006] The first inorganic acid includes one or more of nitric acid, sulfuric acid, and hydrochloric acid; the auxiliary agent includes one or more of sodium sulfate, potassium sulfate, aluminum sulfate, and potassium fluoride.

[0007] In one embodiment, the glass strengthening composition comprises, by weight percentage: 5% to 15% hydrofluoric acid, 14% to 24% a first inorganic acid, 3% to 13% an auxiliary agent, and 48% to 78% a first solvent.

[0008] A second aspect of this application provides a glass strengthening method, comprising the following steps:

[0009] Take the glass to be strengthened, and perform a chemical strengthening process on the glass to be strengthened to prepare a chemically strengthened glass;

[0010] The primary chemically strengthened glass is immersed in the glass strengthening composition described in any embodiment of the first aspect of this application for secondary strengthening.

[0011] In one embodiment, the chemical composition of the glass to be strengthened, by mass percentage, includes: 57-65% SiO2, 11-17% Al2O3, 0-3% B2O3, 11-17% Na2O, 3-8% K2O, 2-8% MgO, and 0.1-2% ZrO2.

[0012] In one embodiment, the glass to be strengthened includes an air surface and a tin surface disposed opposite each other, the air surface satisfying equations (1) and (2), and the tin surface satisfying equations (3) and (4):

[0013] 1.01≤Si air / Si inner ≤1.04 (1),

[0014] 0.86≤Na air / Na inner ≤0.97 (2),

[0015] 1.005≤Si sn / Si inner ≤1.025 (3),

[0016] 0.93≤Na sn / Na inner ≤0.99 (4),

[0017] Among them, Si air This represents the mass percentage of SiO2 in the surface region of the air-filled surface of the glass to be strengthened. inner This indicates the mass percentage of SiO2 in the inner layer region of the glass to be strengthened; Na air This represents the mass percentage of Na2O in the surface region of the air-filled surface of the glass to be strengthened. inner This indicates the mass percentage of Na2O in the inner layer region of the glass to be strengthened; Si sn This indicates the mass percentage of SiO2 in the surface region of the glass-tin surface to be strengthened, and Na... sn This indicates the mass percentage of Na2O in the surface region of the tin surface.

[0018] In one embodiment, the step of chemically strengthening the glass to be strengthened includes:

[0019] The glass to be strengthened is placed in molten potassium nitrate and strengthened once at a temperature of 350℃~440℃.

[0020] In one embodiment, the process parameters for the secondary strengthening include: soaking time of 1 min to 30 min.

[0021] In one embodiment, the thickness of the glass to be strengthened is 0.5mm to 1.5mm.

[0022] A third aspect of this application provides a float high-alumina electronic glass, prepared by the glass strengthening method described in any embodiment of the second aspect of this application.

[0023] In one embodiment, the impact resistance of the float high-alumina electronic glass is 0.8 J to 1.2 J.

[0024] The glass strengthening composition provided in this application, by rationally controlling the component contents of hydrofluoric acid, a first inorganic acid, an auxiliary agent, and a first solvent, and by selecting specific types of the first inorganic acid and auxiliary agent, achieves several advantages. Firstly, the first inorganic acid effectively dissolves the fluorosilicates generated after hydrofluoric acid erodes the microcracks in the glass, thereby effectively preventing the adhesion of fluorosilicates to the glass and ensuring the transparency of the strengthened glass, preventing it from becoming hazy. Secondly, in conventional methods, as the time for hydrofluoric acid to erode the glass increases, the erosive activity of the strengthening solution decreases. This application further incorporates a water-soluble auxiliary agent, enabling the water-soluble auxiliary agent to react with fluorosilicate ions to generate acid, thereby further extending the service life of the composition. Consequently, when the glass strengthening composition provided in this application is used as a secondary strengthening solution for glass, it can effectively enhance the impact resistance of the strengthened glass. Attached Figure Description

[0025] Figure 1 A process flow diagram of the glass strengthening method provided in this application. Detailed Implementation

[0026] The glass strengthening composition, glass strengthening method, and float high-alumina electronic glass of this application are further described in detail below with reference to specific embodiments. This application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0028] In this article, "one or more" refers to any one, two or more of the listed items.

[0029] In this application, terms such as "first aspect," "second aspect," "third aspect," "fourth aspect," and "fifth aspect" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor should they be construed as implicitly indicating the importance or quantity of the indicated technical features. Moreover, terms such as "first," "second," "third," "fourth," and "fifth" serve only as a non-exhaustive enumeration and should be understood not to constitute a closed limitation on quantity.

[0030] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0031] In this application, numerical ranges are referred to as continuous unless otherwise specified, and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0032] Unless otherwise specified, the percentage content mentioned in this application refers to mass percentage for solid-liquid mixtures and solid-phase-solid mixtures, and volume percentage for liquid-phase-liquid mixtures.

[0033] Unless otherwise specified, all percentage concentrations mentioned in this application refer to the final concentration. The final concentration refers to the proportion of the added component in the system after the addition of that component.

[0034] Unless otherwise specified, the temperature parameters in this application may be either constant temperature processing or processing within a certain temperature range. The constant temperature processing allows for temperature fluctuations within the precision range controlled by the instrument.

[0035] A first aspect of this application provides a glass strengthening composition comprising, by weight percentage: 2.5% to 15% hydrofluoric acid, 10% to 30% a first inorganic acid, 3% to 15% an auxiliary agent, and 40% to 84.5% a first solvent;

[0036] The first inorganic acid includes one or more of nitric acid, sulfuric acid, and hydrochloric acid; the auxiliary agent includes one or more of sodium sulfate, potassium sulfate, aluminum sulfate, and potassium fluoride.

[0037] Understood, in this application, the mass percentage of hydrofluoric acid can be selected from any value between 2.5% and 15%. Specifically, the mass percentage of hydrofluoric acid includes, but is not limited to, 2.6%, 3%, 4%, 5%, 8%, 10%, 12%, or 15%. The mass percentage of the first inorganic acid includes, but is not limited to, 12%, 14%, 16%, 18%, 20%, 22%, or 23%. The mass percentage of the auxiliary agent includes, but is not limited to, 5%, 7%, 9%, 10%, 11%, or 12%. The mass percentage of the first solvent includes, but is not limited to, 42%, 45%, 47%, 50%, 52%, 55%, 58%, 60%, 64%, 66%, 68%, 70%, 73%, 75%, 80%, or 82%.

[0038] The glass strengthening composition provided in this application, by rationally controlling the component contents of hydrofluoric acid, a first inorganic acid, an auxiliary agent, and a first solvent, and by selecting specific types of the first inorganic acid and auxiliary agent, achieves several advantages. Firstly, the first inorganic acid effectively dissolves the fluorosilicates generated after hydrofluoric acid erodes the microcracks in the glass, thereby effectively preventing the adhesion of fluorosilicates to the glass and ensuring the transparency of the strengthened glass, preventing it from becoming hazy. Secondly, in conventional methods, as the time for hydrofluoric acid to erode the glass increases, the erosive activity of the strengthening solution decreases. This application further incorporates a water-soluble auxiliary agent, enabling the water-soluble auxiliary agent to react with fluorosilicate ions to generate acid, thereby further extending the service life of the composition. Consequently, when the glass strengthening composition provided in this application is used as a secondary strengthening solution for glass, it can effectively enhance the impact resistance of the strengthened glass.

[0039] Preferably, the glass strengthening composition comprises, by mass percentage: 5%~15% hydrofluoric acid, 14%~24% a first inorganic acid, 3%~13% an auxiliary agent, and 48%~78% a first solvent. By further optimizing the mass percentage of each component in the glass strengthening composition, the synergy of each component can be enhanced, thereby ensuring that the strengthened glass does not become hazy while improving the impact resistance of the glass by >95%.

[0040] In one example, the first solvent includes deionized water.

[0041] A second aspect of this application provides a glass strengthening method, comprising the following steps:

[0042] S10. Take the glass to be strengthened, and perform a chemical strengthening process on the glass to be strengthened to prepare a chemically strengthened glass;

[0043] S20. The primary chemically strengthened glass is immersed in the glass strengthening composition described in any example of the first aspect of this application for secondary strengthening.

[0044] In one example, in step S10, the chemical composition of the glass to be strengthened, by mass percentage, includes: SiO2 57~65%, Al2O3 11~17%, B2O3 0~3%, Na2O 11~17%, K2O 3~8%, MgO 2~8%, and ZrO2 0.1~2%.

[0045] In one example, in step S10, the glass to be strengthened includes an air surface and a tin surface disposed opposite to each other, the air surface satisfying equations (1) and (2), and the tin surface satisfying equations (3) and (4):

[0046] 1.01≤Si air / Si inner ≤1.04 (1),

[0047] 0.86≤Na air / Na inner ≤0.97 (2),

[0048] 1.005≤Si sn / Si inner ≤1.025 (3),

[0049] 0.93≤Na sn / Na inner ≤0.99 (4),

[0050] Among them, Si air This represents the mass percentage of SiO2 in the surface region of the air-filled surface of the glass to be strengthened. inner This indicates the mass percentage of SiO2 in the inner layer region of the glass to be strengthened; Na air This indicates the mass percentage of Na2O in the surface region of the air-filled surface of the glass to be strengthened; Na inner This indicates the mass percentage of Na2O in the inner layer region of the glass to be strengthened; Si sn This indicates the mass percentage of SiO2 in the surface region of the glass-tin surface to be strengthened; Na sn This indicates the mass percentage of Na2O in the surface region of the glass-tin surface to be strengthened.

[0051] In this application, the Si in the surface region of the glass to be strengthened air Na air Si sn Or Na sn The Si content was measured using XRF (X-ray fluorescence spectroscopy). The Si content in the inner layer region of the glass to be strengthened... inner Or Na inner It is obtained by polishing the air and tin surfaces down to the body (i.e., the inner layer region) and then measuring it using XRF (X-ray fluorescence spectroscopy).air or Si sn This indicates the mass percentage of SiO2 in the surface region of the air or tin side of the glass to be strengthened. During the determination of the SiO2 mass percentage, the "surface region" refers to the area from the glass surface to D1; where the thickness of D1 ranges from 16 μm to 20 μm. air Or Na sn This indicates the mass percentage of Na2O in the surface region of the air or tin side of the glass to be strengthened. During the determination of the Na2O mass percentage, the "surface region" refers to the area from the glass surface to D2; where the thickness of D2 ranges from 4 μm to 10 μm. In this application, the "inner layer region" refers to the region other than the surface region. For example, Si... inner This refers to the mass percentage of SiO2 contained in the inner layer of the glass after removing the surface glass layer and the tin surface layer. The calculation formula is as follows: Si inner =Inner layer SiO2 mass / Total inner layer mass * 100%.

[0052] Based on extensive experience and research, the inventors of this application have discovered that if the air surface Si air / Si inner <1.01, Na air / Na inner >0.97 or tin-side Si sn / Si inner <1.005, Na sn / Na inner >0.99,

[0053] Its poor chemical stability can easily lead to problems such as mold growth and rainbow-like markings on the surface of the glass to be strengthened. If the air-faced Si... air / Si inner >1.04, Na air / Na inner <0.86 or tin-side Si sn / Si inner >1.025, Na sn / Na inner If the HF value is less than 0.93, then after chemical strengthening, the glass will undergo secondary acid strengthening. The silicon-oxygen network on the glass surface will be excessively eroded by HF, resulting in uneven refraction on the glass surface. This will cause the glass surface to become hazy and opaque.

[0054] In one example, step S10, which involves chemically strengthening the glass to be strengthened, includes:

[0055] The glass to be strengthened is placed in molten potassium nitrate and strengthened once at a temperature of 350°C to 440°C. It is understood that, in this application, the temperature for the first strengthening can be selected from any value between 350°C and 440°C. Specifically, the temperature for the first strengthening includes, but is not limited to, 360°C, 380°C, 400°C, 420°C, 430°C, or 440°C.

[0056] In one example, in step S20, the process parameters for the secondary strengthening include an immersion time of 1 min to 30 min. It is understood that the immersion time in this application can be any value between 1 min and 30 min. Specifically, the immersion time includes, but is not limited to, 2 min, 5 min, 10 min, 15 min, 20 min, 25 min, or 28 min. Controlling the immersion time within this range can effectively prevent the decrease in the glass's impact resistance caused by over-immersion.

[0057] To ensure that the thickness of the glass to be strengthened is compatible with the glass strengthening composition provided in this application, in one example, the thickness of the glass to be strengthened is 0.5 mm to 1.5 mm.

[0058] In one example, the glass strengthening method further includes, after the secondary strengthening step S20:

[0059] S30. The step of rinsing the glass to be strengthened with clean water.

[0060] In one more specific example, the glass strengthening method includes the following steps:

[0061] S110. Take the glass to be strengthened, perform glass milling (CNC machining) on ​​the glass to be strengthened, place the glass to be strengthened in molten potassium nitrate, and perform one strengthening at a temperature of 350℃~440℃ to prepare one-time chemically strengthened glass;

[0062] S120. The primary chemically strengthened glass is immersed in the glass strengthening composition described in any example of the first aspect of this application for 1 min to 30 min to perform secondary strengthening, thereby preparing secondary chemically strengthened glass;

[0063] S130. Wash the secondary chemically strengthened glass with water.

[0064] A third aspect of this application provides a float high-alumina electronic glass, prepared by the glass strengthening method described in any example of the second aspect of this application.

[0065] In one example, the float high-alumina electronic glass contains 11% to 17% Al2O3 by mass.

[0066] The float high-alumina electronic glass prepared by the glass strengthening method of this application was found to be completely transparent and bright when irradiated with a strong light with an illuminance of more than 10,000 Lux, and its impact resistance was improved by at least 50% compared with the previous method.

[0067] In one example, the impact resistance of the float high-alumina electronic glass is 0.8 J to 1.2 J.

[0068] The following specific embodiments further illustrate this application, but this application is not limited to the following embodiments.

[0069] Examples 1-10, Comparative Examples 1-4

[0070] Examples 1-10 and Comparative Examples 1-4 provide a glass strengthening method, comprising the following steps:

[0071] (1) Select the glass to be strengthened prepared by float glass process, wherein the chemical composition of the glass to be strengthened, in mass percentage, includes: SiO2 60%, Al2O3 14%, B2O3 0%, Na2O 14%, K2O 5.5%, MgO 6%, ZrO2 0.5%; the thickness of the glass to be strengthened is 0.7mm.

[0072] (2) The glass to be strengthened was subjected to a single strengthening process in pure KNO3 molten salt at 420℃ for 4 hours to obtain a single-strengthened glass.

[0073] (3) The primary strengthened glass is immersed in a glass strengthening composition for secondary strengthening.

[0074] The properties of the glass to be strengthened, the composition of the glass strengthening composition, and the time of secondary strengthening in Examples 1 to 10 and Comparative Examples 1 to 4 are shown in Tables 1 to 3.

[0075] Table 1

[0076]

[0077] Table 2

[0078]

[0079] Table 3

[0080]

[0081] The glass from Examples 1-10 and Comparative Examples 1-4, after undergoing secondary strengthening, was irradiated with a strong light with an illuminance exceeding 10,000 Lux, and its transparency was observed. The glass from Examples 1-10 and Comparative Examples 1-4, after undergoing secondary strengthening, underwent impact resistance testing. The specific impact resistance evaluation method was as follows: a falling ball impact tester was used to test the glass's ultimate impact strength. Specifically, a 64g ball was released from a certain height above the center of the glass, and the breakage was observed. If the glass did not break in that drop, the ball was raised 10cm and the drop test was repeated until breakage occurred. Then, the impact energy of the glass was calculated. The impact energy was calculated as: W = mgh, where m is the mass of the metal ball, and g is the acceleration due to gravity, taken as 10 m / s². 2 Where h is the fracture height. After testing, the primary tempered glass used in Examples 1 to 10 and Comparative Examples 1 to 4, i.e., primary tempered glass that has not been soaked in the glass strengthening composition, has an impact resistance of 0.502 J.

[0082] The test results of Examples 1 to 10 and Comparative Examples 1 to 4 are shown in Table 4:

[0083] Table 4

[0084]

[0085] As shown in Table 4, the glass strengthening composition of this application used in Examples 1 to 10 of this application can make the glass surface free of haze after secondary strengthening, and can effectively improve the impact resistance of the glass, increasing its impact resistance by more than 60%.

[0086] By comparing Comparative Example 2 and Example 6, and Comparative Example 3 and Example 4, it was found that in Comparative Example 2 of this application, the Si on the glass air surface... air / Si inner >1.04, and Na at the air surface air / Na inner <0.86; In Comparative Example 3, the Na content of the glass-tin surface was... sn / Na inner <0.93; After Comparative Examples 2 and 3 were immersed in the same glass strengthening composition as Examples 6 and 4, respectively, the inherent cracks in the glass were resolved and its impact resistance was effectively improved. However, after immersion in the glass strengthening composition, the silica network on the glass surface of the glass in Comparative Examples 2 and 3 was excessively eroded, resulting in uneven refraction of the glass, specifically manifested as a hazy appearance on the glass surface.

[0087] The glass air gap selected in Comparative Example 1 satisfies 1.01 ≤ Si air / Si inner≤1.04 and 0.86≤Na air / Na inner ≤0.97; the tin surface satisfies 1.005≤Si sn / Si inner ≤1.025, 0.93≤Na sn / Na inner ≤0.99. However, after being strengthened by the glass strengthening composition provided in Comparative Example 1, the surface of the strengthened glass becomes severely hazy, affecting the appearance performance of the glass. This indicates that the glass strengthening composition provided in Comparative Example 1 does not meet the actual use requirements of strengthened glass.

[0088] A comparison of Examples 4 and 9 revealed that prolonged immersion time in the glass strengthening composition provided in this application affects the impact resistance of the glass. Further comparison of Examples 1-10 showed that the glass strengthening compositions provided in Examples 1-10, in Examples 3, 5, 6, 8, and 10, had a hydrofluoric acid mass percentage of 5%-15%, a first inorganic acid mass percentage of 14%-24%, an auxiliary agent mass percentage of 3%-13%, and a water mass percentage of 48%-78%, resulting in a higher degree of improvement in the impact resistance of the immersed glass, with an improvement rate ≥98%.

[0089] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The embodiments described above are merely illustrative of several implementation methods of this application, intended to facilitate a detailed understanding of the technical solutions of this application, but should not be construed as limiting the scope of protection of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. It should be understood that technical solutions obtained by those skilled in the art based on the technical solutions provided in this application through logical analysis, reasoning, or limited experimentation are all within the scope of protection of the appended claims. Therefore, the scope of protection of this patent application should be determined by the content of the appended claims, and the specification can be used to interpret the content of the claims.

Claims

1. A method for strengthening glass, characterized in that, Includes the following steps: Take the glass to be strengthened, perform a first chemical strengthening on the glass to be strengthened to prepare a first chemically strengthened glass; immerse the first chemically strengthened glass in a glass strengthening composition for a second strengthening. The glass to be strengthened includes an air surface and a tin surface arranged opposite to each other. The air surface satisfies equations (1) and (2), and the tin surface satisfies equations (3) and (4). 1.01≤Si air / And inner ≤1.04 (1), 0.86≤Na air / That inner ≤0.97 (2), 1.005≤Si sn / And inner ≤1.025 (3), 0.93≤Na sn / That inner ≤0.99 (4), Among them, Si air This represents the mass percentage of SiO2 in the surface region of the air-filled surface of the glass to be strengthened. inner This indicates the mass percentage of SiO2 in the inner layer region of the glass to be strengthened; Na air This indicates the mass percentage of Na2O in the surface region of the air-filled surface of the glass to be strengthened; Na inner This indicates the mass percentage of Na2O in the inner layer region of the glass to be strengthened; Si sn This indicates the mass percentage of SiO2 in the surface region of the glass-tin surface to be strengthened; Na sn This indicates the mass percentage of Na2O in the surface region of the glass-tin surface to be strengthened; The glass strengthening composition comprises, by weight percentage: 2.5% to 15% hydrofluoric acid, 10% to 30% a first inorganic acid, 3% to 15% an auxiliary agent, and 40% to 84.5% a first solvent; wherein the first inorganic acid includes one or more of nitric acid, sulfuric acid, and hydrochloric acid; and the auxiliary agent includes one or more of sodium sulfate, potassium sulfate, aluminum sulfate, and potassium fluoride.

2. The glass strengthening method according to claim 1, characterized in that, The glass strengthening composition comprises, by weight percentage, the following components: 5% to 15% hydrofluoric acid, 14% to 24% first inorganic acid, 3% to 13% auxiliary agent, and 48% to 78% first solvent.

3. The glass strengthening method according to claim 1, characterized in that, The chemical composition of the glass to be strengthened, by mass percentage, includes: SiO2 57~65%, Al2O3 11~17%, B2O3 0~3%, Na2O 11~17%, K2O 3~8%, MgO 2~8%, and ZrO2 0.1~2%.

4. The glass strengthening method according to any one of claims 1 to 3, characterized in that, The steps of chemically strengthening the glass to be strengthened include: The glass to be strengthened is placed in molten potassium nitrate and strengthened once at a temperature of 350℃~440℃.

5. The glass strengthening method according to any one of claims 1 to 3, characterized in that, The process parameters for the secondary strengthening include: soaking time of 1 min to 30 min.

6. The glass strengthening method according to any one of claims 1 to 3, characterized in that, The thickness of the glass to be strengthened is 0.5mm to 1.5mm.

7. A type of float high-alumina electronic glass, characterized in that, It is prepared by the glass strengthening method according to any one of claims 1 to 6.

8. The float high-alumina electronic glass according to claim 7, characterized in that, The impact resistance of the float high-alumina electronic glass is 0.8 J to 1.2 J.

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