WO2017201681A1 - Aluminosilicate glass, antibacterial glass and preparation method therefor - Google Patents

Abstract

Disclosed is an aluminosilicate glass, comprising the following components represented by mass percent contents taking the following oxides as references: 60%-72% of silicon dioxide, 4%-9% of aluminium oxide, 8%-15% of sodium oxide, 0%-5% of potassium oxide, 3%-9% of calcium oxide and 1%-6% of magnesium oxide.

Description

Aluminosilicate glass, antibacterial glass and preparation method thereof Technical field:

The invention relates to an aluminosilicate glass, an antibacterial glass and a preparation method thereof.

Background technique:

In order to prevent possible accidents, most people are accustomed to attaching a protective patch to a newly purchased mobile phone to protect the screen without affecting the display. Mobile phones are in contact with the human body more frequently, and are highly susceptible to bacteria. These patches do not have antibacterial ability, which may cause bacteria to accumulate on the patch, which may cause health hazards. If someone else uses their own mobile phone, it is more likely to cause problems such as cross-infection. Protective patches with antibacterial properties are increasingly used.

The existing glass patch with antibacterial function can meet the user's requirements in terms of stress value (CS) and stress layer depth (DOL) due to the use of a high alkali aluminosilicate system, but its antibacterial treatment process is difficult. If the one-step method is adopted, even if the ion exchange time is long, even if the concentration of silver nitrate in the molten salt is lowered as much as possible, the transmittance of the patch is lowered, and the color is also significantly yellowish, thereby affecting the screen display effect. With the two-step method, the time of ion exchange in the second step is also difficult to control, and it is difficult to achieve both antibacterial and optical properties.

Summary of the invention:

Based on this, it is necessary to provide an aluminosilicate glass, an antibacterial glass, and a preparation method thereof which can achieve both antibacterial properties and optical properties.

An aluminosilicate glass expressed by mass percentage based on the following oxides, comprising the following components: 60% to 72% silica, 4% to 9% aluminum oxide, 8% to 15% Sodium oxide, 0% to 5% potassium oxide, 3% to 9% calcium oxide and 1% to 6% magnesium oxide.

An antibacterial glass by using a two-step chemical strengthening process for an aluminosilicate The glass is obtained by introducing silver ions, and the aluminosilicate glass is expressed by mass percentage based on the following oxides, and includes the following components: 60% to 72% of silica, 4% to 9% of aluminum oxide, 8% to 15% of sodium oxide, 0% to 5% of potassium oxide, 3% to 9% of calcium oxide and 1% to 6% of magnesium oxide.

A method for preparing an antibacterial glass, comprising the steps of:

Aluminosilicate glass is provided, which is expressed by mass percentage based on the following oxides, and includes the following components: 60% to 72% silica, 4% to 9% trioxide Aluminum, 8% to 15% sodium oxide, 0% to 5% potassium oxide, 3% to 9% calcium oxide and 1% to 6% magnesium oxide, and

The two-step chemical strengthening process is used to introduce silver ions into the aluminosilicate glass to obtain an antibacterial glass.

In the above aluminosilicate glass, the content of aluminum oxide and sodium oxide is reasonable, and the ion exchange capacity is stronger than that of the soda-lime-silica glass, and the predetermined stress value and ion exchange can be achieved in a short time. Depth, compared with traditional high alumina glass, the aluminosilicate glass has a slightly weaker ion exchange capacity, and still retains a certain ion exchange capacity after the conventional chemical strengthening, so that silver ion is introduced into the ion exchange process with the two-step chemical strengthening process. The antibacterial glass is adapted to introduce silver ions in the second step of ion exchange, so that less AgNO ₃ is required, and the time of the second step ion exchange can be sufficiently shortened, thereby solving the second stage strengthening process. The problem of transmittance, color and stress caused by excessive Ag ⁺ is tested, and the antibacterial glass obtained has an antibacterial rate of 99.99%, and the antibacterial glass is compared with the original aluminosilicate glass without antibacterial treatment. The light transmittance attenuation value ΔT < 1% and the color change value ΔE < 1, so that both the antibacterial property and the optical performance can be achieved.

DRAWINGS

1 is a process flow diagram of a method of preparing an antimicrobial glass according to an embodiment.

detailed description

The aluminosilicate glass, the antibacterial glass and the preparation method thereof are mainly described in detail below in conjunction with specific embodiments.

The aluminosilicate glass of one embodiment comprises the following components in terms of mole percent:

60% to 72% silica, 4% to 9% aluminum oxide, 8% to 15% sodium oxide, 0% to 5% Potassium oxide, 3% to 9% calcium oxide and 1% to 6% magnesium oxide.

Silica (SiO ₂ ) is a necessary component for forming an aluminosilicate glass skeleton. SiO ₂ can increase the strength, chemical stability, and the like of the aluminosilicate glass, and the mass percentage of the silica is preferably 60% to 72%. If the mass percentage of SiO ₂ is less than 60%, the weather resistance of the aluminosilicate glass is insufficient; if it exceeds 72%, the aluminosilicate glass becomes refractory.

Aluminum oxide (Al ₂ O ₃ ) can improve the chemical stability and ion exchange performance of aluminosilicate glass, and is a component necessary for promoting ion exchange, and the mass fraction is preferably 4% to 9%. If the mass percentage of Al ₂ O ₃ is less than 4%, the ion exchange capacity of the aluminosilicate glass is insufficient, and the required CS and DOL values cannot be achieved under a predetermined chemical strengthening process; if it exceeds 9%, the aluminum is The ion exchange capacity of the silicate glass is too strong. When the antibacterial treatment is carried out by the two-step method, the ion exchange with the molten salt in the first step is too sufficient, and the introduction amount of the antibacterial ion in the second step is insufficient, thereby affecting the antibacterial property. At the same time, too high Al ₂ O ₃ content will lead to an increase in the viscosity of the glass, which is not conducive to melting and clarification.

Sodium oxide (Na ₂ O) can significantly reduce the melting temperature of aluminosilicate glass, and is a necessary component for chemical strengthening. The mass percentage is preferably 8% to 15%, if the mass percentage is less than 8%. , in the aluminosilicate glass, the Na ⁺ which can be exchanged with the K ⁺ in the molten salt is insufficient, and it is difficult to strengthen, and the aluminosilicate glass is also refractory; if it is higher than 15%, the aluminosilicate glass is Weather resistance is worse.

Potassium oxide (K ₂ O) is not an essential component, it can significantly reduce the melting temperature of aluminosilicate glass, and its "mixed alkali effect" with Na ₂ O can adjust the thermal expansion coefficient of glass within a certain range to ensure its Matches the screen. The mass percentage of K ₂ O is preferably 0% to 5%, and if it exceeds 5%, the weather resistance of the aluminosilicate glass is insufficient.

Calcium oxide (CaO) can reduce the viscosity of aluminosilicate glass at high temperature and promote the melting and clarification of aluminosilicate glass, but it has an inhibitory effect on ion exchange, and its mass percentage is preferably 3% to 7%. . If the mass percentage of CaO is less than 3%, the viscosity of the aluminosilicate glass is too large to be melted, and if it is higher than 9%, the devitrification resistance of the aluminosilicate glass is deteriorated, and the ion exchange performance is lowered. . At the same time, the aluminosilicate glass has too short a material property, which is not suitable for molding.

Magnesium oxide (MgO) is a component that lowers the high-temperature viscosity of aluminosilicate glass to improve meltability and moldability. If the mass percentage is less than 1%, a significant effect of improving the meltability cannot be obtained; If the mass percentage is higher than 6%, the aluminosilicate glass is easily devitrified. The mass percentage of magnesium oxide is preferably from 1 to 6%.

In the above aluminosilicate glass, the content of aluminum oxide and sodium oxide is reasonable, and the ion exchange capacity is stronger than that of the soda-lime-silica glass, and the predetermined stress value and ion exchange can be achieved in a short time. Depth, compared with traditional high alumina glass, the aluminosilicate glass has a slightly weaker ion exchange capacity, and still retains a certain ion exchange capacity after the conventional chemical strengthening, so that silver ion is introduced into the ion exchange process with the two-step chemical strengthening process. The antibacterial glass is adapted to introduce silver ions in the second step of ion exchange, so that less AgNO ₃ is required, and the time of the second step ion exchange can be sufficiently shortened, thereby solving the second stage strengthening process. The problem of transmittance, color and stress caused by excessive Ag ⁺ is tested, and the antibacterial glass obtained has an antibacterial rate of 99.99%, and the antibacterial glass is compared with the original aluminosilicate glass without antibacterial treatment. The light transmittance attenuation value ΔT < 1% and the color change value ΔE < 1, so that both the antibacterial property and the optical performance can be achieved.

In the preparation of the above aluminosilicate glass, the raw materials of each component are weighed and uniformly mixed, and melt-processed at 1550 ° C to 1650 ° C, and then homogenized and formed. The molding may be carried out by a float process, a down draw process or a cast molding, which is not limited herein.

The antibacterial glass of one embodiment is obtained by ion-exchange of silver ions into the aluminosilicate glass by a two-step chemical strengthening process.

In one embodiment, the operation of introducing silver ions into the aluminosilicate glass by ion exchange using a two-step chemical strengthening process is specifically as follows:

First-order ion exchange of aluminosilicate glass using KNO ₃ molten salt;

The second step ion exchange is performed on the aluminosilicate glass subjected to the first-step ion exchange using a mixed molten salt, and the mixed molten salt includes AgNO ₃ and KNO ₃ .

In one embodiment, the temperature difference between the first ion exchange and the second ion exchange is within 50 °C. Thereby, it is possible to ensure that the aluminosilicate glass is not broken by excessive thermal shock.

In one of the embodiments, the first ion exchange temperature is from 380 ° C to 450 ° C. The first step of ion exchange is carried out in a pure KNO ₃ molten salt, the temperature of the molten salt is preferably 380 ° C to 450 ° C, and the temperature is lower than 380 ° C, the ion exchange rate is slow, and the time required to achieve the predetermined strengthening effect is too long; When the temperature is higher than 450 °C, the stress relaxation phenomenon is easy to occur under the conventional ion exchange time, which lowers the CS. If the time is shortened, the DOL may be insufficient. In addition, the high temperature accelerates the decomposition of the molten salt and affects the service life of the molten salt. .

In one of the embodiments, the first ion exchange time is from 2 hours to 4 hours. When the time is less than 2 h, the ion exchange is insufficient, and the predetermined strengthening effect is not achieved; when the time exceeds 4 h, the stress relaxation is caused, and the strength of the aluminosilicate glass is lowered.

In order to impart antibacterial ability to the glass, AgNO ₃ was incorporated in KNO ₃ used in the second step of ion exchange. In one embodiment, the mass ratio of the AgNO ₃ to the KNO ₃ in the mixed molten salt is 0.01:100 to 0.1:100, and if the AgNO ₃ content is too low, the aluminosilicate glass cannot obtain sufficient antibacterial. Capability; if the content of AgNO _{3 is} too high, silver ions will enter the aluminosilicate glass in large quantities, affecting the transmittance and color of the aluminosilicate glass, and also increasing the cost.

In one of the embodiments, the temperature of the second step of ion exchange is from 370 °C to 420 °C. When the temperature is lower than 370 ° C, the rate of entry of silver ions into the aluminosilicate glass is slow, and the time required to reach the predetermined antibacterial ability is long. When the temperature is higher than 420 ° C, silver nitrate will decompose, making the aluminosilicate glass unable to obtain antibacterial ability.

In one embodiment, the second step of ion exchange is between 30 seconds and 90 seconds. When the time is less than 30 s, the silver ions entering the aluminosilicate glass are insufficient, and sufficient antibacterial ability cannot be obtained. Moreover, it is not easy to realize in operation; when the time exceeds 90 s, too much silver ions enter the glass, causing coloration and lowering the transmittance of the glass.

The above antibacterial glass is obtained by introducing silver ions into the ion exchange by a two-step chemical strengthening process, and the aluminosilicate glass retains a certain ion exchange capacity after the conventional chemical strengthening, so that silver ions are introduced into the two-step chemical strengthening process. The ion exchange is carried out to obtain the antibacterial glass, that is, the silver ion is introduced in the second step of ion exchange, so that less AgNO ₃ is required, and the time of the second step ion exchange can be sufficiently shortened, thereby solving the second stage. Intensifying the problem of transmittance, color and stress caused by excessive Ag ^{+ in the} process, the antibacterial glass obtained by the test has an antibacterial rate of 99.99%, and the light transmission of the antibacterial glass relative to the aluminosilicate glass The rate attenuation value ΔT < 1% and the color change value ΔE < 1, so that both the antibacterial property and the optical performance can be achieved.

Please refer to FIG. 1 , a method for preparing an antibacterial glass according to an embodiment, comprising the following steps:

Step S110, providing an aluminosilicate glass.

The aluminosilicate glass is the above aluminosilicate glass. Aluminosilicate glass is expressed in terms of mass percent of the following oxides, including the following components: 60% to 72% silica, 4% to 9% aluminum oxide, 8% to 15% oxidation. Sodium, 0% to 5% potassium oxide, 3% to 9% calcium oxide and 1% to 6% magnesium oxide.

In step S120, the aluminosilicate glass is thinned by using a thinning liquid.

In one embodiment, thinned by mass percentage content of liquid comprising 30% of HF, 5% of H ₂ SO _4, 10% of HCl, 15% of NH ₄ HF _2, and 40% water.

In one of the embodiments, the temperature of the thinning liquid was 80 ° C, and the time of the thinning treatment was 4 hours.

In one of the embodiments, the thinning solution is used for the thinning treatment, and then rinsed with deionized water and dried. Preferably, it is dried in an oven at a temperature of 120 °C.

Of course, if the thinning process is not required, step S120 can be omitted.

Step S130, using a two-step chemical strengthening process to introduce silver ions into the aluminosilicate glass for ion exchange to obtain an antibacterial glass.

In one embodiment, the operation of introducing silver ions into the aluminosilicate glass by ion exchange using a two-step chemical strengthening process is specifically as follows:

First-order ion exchange of aluminosilicate glass using KNO ₃ molten salt;

The second step ion exchange is performed on the aluminosilicate glass subjected to the first-step ion exchange using a mixed molten salt, and the mixed molten salt includes AgNO ₃ and KNO ₃ .

In one embodiment, the temperature difference between the first ion exchange and the second ion exchange is within 50 °C. Thereby, it is possible to ensure that the aluminosilicate glass is not broken by excessive thermal shock.

In one of the embodiments, the first ion exchange temperature is from 380 ° C to 450 ° C. The first step of ion exchange is carried out in a pure KNO ₃ molten salt, the temperature of the molten salt is preferably 380 ° C to 450 ° C, and the temperature is lower than 380 ° C, the ion exchange rate is slow, and the time required to achieve the predetermined strengthening effect is too long; When the temperature is higher than 450 °C, the stress relaxation phenomenon is easy to occur under the conventional ion exchange time, which reduces the CS. If the time is shortened, the DOL may be insufficient. In addition, the high temperature accelerates the decomposition of the molten salt and affects the service life of the molten salt. .

In one of the embodiments, the first ion exchange time is from 2 hours to 4 hours. When the time is less than 2 h, the ion exchange is insufficient, and the predetermined strengthening effect is not achieved; when the time exceeds 4 h, the stress relaxation is caused, and the strength of the aluminosilicate glass is lowered.

In order to impart antibacterial ability to the glass, AgNO ₃ was incorporated in KNO ₃ used in the second step of ion exchange. In one embodiment, the mass ratio of the AgNO ₃ to the KNO ₃ in the mixed molten salt is 0.01:100 to 0.1:100, and if the AgNO ₃ content is too low, the aluminosilicate glass cannot obtain sufficient antibacterial. Capability; if the content of AgNO _{3 is} too high, silver ions will enter the aluminosilicate glass in large quantities, affecting the transmittance and color of the aluminosilicate glass, and also increasing the cost.

In one of the embodiments, the temperature of the second step of ion exchange is from 370 °C to 420 °C. When the temperature is lower than 370 ° C, the rate of entry of silver ions into the aluminosilicate glass is slow, and the time required to reach the predetermined antibacterial ability is long. When the temperature is higher than 420 ° C, silver nitrate will decompose, making the aluminosilicate glass unable to obtain antibacterial ability.

In one embodiment, the second step of ion exchange is between 30 seconds and 90 seconds. When the time is less than 30 s, the silver ions entering the aluminosilicate glass are insufficient, and sufficient antibacterial ability cannot be obtained. Moreover, it is not easy to realize in operation; when the time exceeds 90 s, too much silver ions enter the glass, causing coloration and lowering the transmittance of the glass.

In one of the embodiments, the second step is ion exchanged, cooled to room temperature, washed and dried. Preferably, it is washed in an ultrasonic cleaner containing deionized water for 1 hour, and then placed in a constant temperature blast drying oven at 120 ° C for testing.

In the method for preparing the antibacterial glass, the aluminosilicate glass is subjected to an antibacterial treatment after being subjected to a thinning treatment, and the aluminosilicate glass has a reasonable formulation and is more easily thinned; the antibacterial treatment is carried out by a two-step method. Antibacterial and optical properties.

Hereinafter, the detailed description will be given in conjunction with specific embodiments.

The aluminosilicate glass and the tempered glass described above will be described in detail below with reference to specific examples.

Examples 1 to 9 and Comparative Examples 1 to 3

Table 1

In the preparation of the aluminosilicate glasses of Examples 1 to 9 and Comparative Examples 1 to 3, the raw materials were weighed according to the ratio of each raw material in Table 1 (may also be a carbonate corresponding to the oxide in the table, etc.) The composition), after thorough mixing, put into a platinum crucible, and put the platinum crucible into a silicon molybdenum furnace at 1550 ° C ~ 1650 ° C, The raw material was melted for 3 hours, homogenized and cast into a mold, and annealed at a predetermined temperature to obtain a bulk glass. The block glass was cut, and both surfaces were polished to obtain a plate glass having a size of 50 mm × 50 mm × 0.55 mm and 400 mm × 400 mm × 0.55 mm.

The obtained plate glass is subjected to two-step chemical strengthening process to introduce silver ions for ion exchange to obtain antibacterial glass, and the first time ion exchange is performed on the aluminosilicate glass by using KNO ₃ molten salt, and the temperature of the first ion exchange is T. _{1. The} first ion exchange time is τ ₁ ; the mixed molten salt performs the second ion exchange on the aluminosilicate glass subjected to the first ion exchange, and the mixed molten salt includes AgNO ₃ and KNO ₃ , and the second step ion The exchanged temperature is T ₂ , the second ion exchange time is τ ₂ , and the mass ratio of AgNO ₃ to KNO ₃ is n:100. After the second step of ion exchange, after cooling to room temperature with the furnace, it is washed in an ultrasonic cleaner containing deionized water for 1 hour, and then placed in a constant temperature blast drying oven at 120 ° C for testing. use. Refer to Table 1 for the parameters in the first step of ion exchange and the second step of ion exchange.

The antibacterial glass obtained by the antibacterial treatment was subjected to stress value (CS) and stress layer depth (DOL), transmittance, color, and antibacterial property test, and the results are shown in Table 1.

The stress value (CS) and stress layer depth (DOL) of the glass were tested using an FSM-6000LE stress meter.

The transmittance and color of the glass were tested by the Datacolor 650 high precision benchtop spectrophotometer.

The antibacterial properties of the glass were tested in accordance with the JC/T 1054-2007 coated antibacterial glass standard for the test of two strains of Escherichia coli and Staphylococcus aureus.

In Table 1, ΔT (%) is the attenuation value of the transmittance of the antibacterial glass with respect to the original sheet which is not subjected to the antibacterial treatment, and ΔE is the color difference of the antibacterial glass with respect to the original sheet which is not subjected to the antibacterial treatment. Comparative Example 1 is a common soda lime glass, and Comparative Examples 2 and 3 are both high alumina glass.

As can be seen from Table 1, the soda-lime glass has a low ion exchange capacity by stress test, especially after exchange, its DOL value is very low, and relatively, despite the aluminosilicate glass and high aluminum of Examples 1-9. There is a certain difference in the ion exchange capacity of the glass, but the difference between the two is not large, and the CS and DOL of the aluminosilicate glass of Examples 1 to 9 can meet the general requirements after ion exchange.

Comparative Example 2 The antibacterial rate meets the requirements, but due to its excessive ion exchange capacity, the second step of ion exchange Excessive silver ions entering the glass cause a decrease in transmittance and a significant change in color.

After adjusting the second-stage ion exchange process, the transmittance and color of Comparative Example 3 were improved, but the transmittance was not satisfactory.

The antibacterial glass prepared by the aluminosilicate glass of Examples 1 to 9 can achieve both antibacterial properties and optical properties.

Examples 10 to 13 and Comparative Examples 4 to 5

Table 2

In the preparation of the aluminosilicate glasses of Examples 10 to 13 and Comparative Examples 4 to 5, the raw materials were weighed according to the ratio of each raw material in Table 2 (may also be a carbonate corresponding to the oxide in the table, etc.) The composition is fully mixed, placed in a platinum crucible, and placed in a silicon molybdenum furnace at 1550 ° C to 1650 ° C. The raw material is melted for 3 hours, homogenized and cast into a mold at a predetermined temperature. Annealing to obtain a block Glass. The block glass was cut, and both surfaces were polished to obtain a plate glass having a size of 400 mm × 400 mm × 0.55 mm.

The sheet glass obtained in Examples 10 to 13 and Comparative Examples 4 to 5 was thinned. The thinning solution consisted of 30% HF, 5% H ₂ SO ₄ , 10% HCl, 15% NH ₄ HF ₂ and 40% deionized water. The thinning liquid was heated to maintain the temperature at 80 ° C, and the plate glass was immersed in the thinning liquid for 4 hours, then rinsed with deionized water, and placed in an oven at a temperature of 120 ° C for drying. dry. After cooling to room temperature, the thickness was measured using a spiral micrometer. The results are shown in Table 2.

As can be seen from Table 2, the aluminosilicate glass of the present invention is more easily thinned than the high alumina glass. If the aluminosilicate glass of the present invention is used as a patch, the thickness thereof can be minimized, thereby minimizing the influence of the patch on the display effect.

The technical features of the above-described embodiments may be arbitrarily combined. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be considered as the scope of this manual.

The above-mentioned embodiments are merely illustrative of one or more embodiments of the present invention, and the description thereof is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims (15)

An aluminosilicate glass characterized by a mass percentage comprising the following components: 60% to 72% silica, 4% to 9% aluminum oxide, 8% to 15% sodium oxide, 0% to 5% potassium oxide, 3% to 9% calcium oxide and 1% ~6% magnesium oxide. An antibacterial glass obtained by introducing silver ions into an aluminosilicate glass by a two-step chemical strengthening process, the aluminosilicate glass being expressed by mass percentage of the following oxide standard , including the following components: 60% to 72% silica, 4% to 9% aluminum oxide, 8% to 15% sodium oxide, 0% to 5% potassium oxide, 3% to 9% calcium oxide and 1% ~6% magnesium oxide. The antibacterial glass according to claim 2, wherein the operation of introducing silver ions into the aluminosilicate glass by a two-step chemical strengthening process is specifically: First-order ion exchange of aluminosilicate glass using KNO ₃ molten salt; The second step ion exchange is performed on the aluminosilicate glass subjected to the first-step ion exchange using a mixed molten salt including AgNO ₃ and KNO ₃ . The antimicrobial glass according to claim 3, wherein the temperature difference between the first step ion exchange and the second step ion exchange is within 50 °C. The antimicrobial glass according to claim 3, wherein the first ion exchange temperature is 380 ° C to 450 ° C, and the first ion exchange time is 2 hours to 4 hours. The antimicrobial glass according to claim 3, wherein the second step ion exchange temperature is 370 ° C to 420 ° C, and the second step ion exchange time is 30 seconds to 90 seconds. The antimicrobial glass according to claim 3, wherein a mass ratio of the AgNO ₃ to the KNO ₃ in the mixed molten salt is from 0.01:100 to 0.1:100. A method for preparing an antibacterial glass, comprising the steps of: Aluminosilicate glass is provided, which is expressed by mass percentage based on the following oxides, and includes the following components: 60% to 72% silica, 4% to 9% trioxide Aluminum, 8% to 15% Sodium oxide, 0% to 5% potassium oxide, 3% to 9% calcium oxide and 1% to 6% magnesium oxide, and The two-step chemical strengthening process is used to introduce silver ions into the aluminosilicate glass to obtain an antibacterial glass. The method according to claim 8, further comprising the step of: subliminating the aluminosilicate glass before the step of introducing silver ions into the aluminosilicate glass by ion exchange using a two-step chemical strengthening process The thin liquid is thinned. The method according to claim 9, wherein the thinning liquid comprises water, 30% to 50% HF, 1% to 5% H ₂ SO ₄ , 5% by mass. 10% HCl and 10% to 20% NH ₄ HF ₂ . The method according to claim 8, wherein the ion exchange operation for introducing silver ions into the aluminosilicate glass by a two-step chemical strengthening process is specifically as follows: First-order ion exchange of aluminosilicate glass using KNO ₃ molten salt; The second step ion exchange is performed on the aluminosilicate glass subjected to the first-step ion exchange using a mixed molten salt including AgNO ₃ and KNO ₃ . The method of claim 11 wherein the temperature difference between said first step ion exchange and said second step ion exchange is within 50 °C. The method according to claim 11, wherein the first ion exchange temperature is 380 ° C to 450 ° C, and the first step ion exchange time is 2 hours to 4 hours. The method according to claim 11, wherein the second step ion exchange temperature is 370 ° C to 420 ° C, and the second step ion exchange time is 30 seconds to 90 seconds. The method according to claim 11, wherein a mass ratio of said AgNO ₃ to said KNO ₃ in said mixed molten salt is from 0.01:100 to 0.1:100.

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