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Method for Chemical Strengthening of Lithium-Aluminosilicate Glass

A lithium-aluminum-silicon and glass technology, applied in chemical instruments and methods, cleaning methods using liquids, cleaning methods and utensils, etc., can solve problems such as fragility, poor drop resistance, and difficulty in salt solution exchange, and achieve shortening and strengthening time, glass performance improvement, and the effect of increasing the preheating temperature

Active Publication Date: 2022-05-20
XIANNING NANBO PHOTOELECTRIC GLASS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, CS and DOL cannot meet the customer's standard requirements as the concentration decreases, and this strengthening method is only for alkaline glass, ordinary soda lime glass or medium aluminum glass
[0005] Aluminum-lithium-silicate glass is difficult to strengthen, especially for glass with high Al content and Li content. During strengthening, it is difficult to exchange salt solution, and the effect after strengthening treatment is often not ideal. CS and Dol cannot meet the requirements. Poor, very fragile

Method used

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  • Method for Chemical Strengthening of Lithium-Aluminosilicate Glass

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Comparison scheme
Effect test

Embodiment 1

[0040] The chemical strengthening method of lithium aluminum silicate glass, concrete steps are:

[0041] 1. Select lithium-aluminum-silicon products and preheat them in a preheating furnace. The preheating temperature is 360°C and the time is 2 hours;

[0042] 2. The preheated product is strengthened once, and the ratio of sodium nitrate:potassium nitrate=65% is selected for the strengthening liquid. Strengthening time: 6h, strengthening temperature: 380°C.

[0043] 3. After the product is strengthened, move the product to the preheated furnace, open the furnace cover, turn off the heating switch, and cool down with the room temperature. When it is cooled to 100°C, perform pure water cleaning. The conditions for pure water cleaning are: rinse with pure water in two sinks in sequence. The temperature of pure water in the first sink is 55°C for 1 hour. The temperature of the pure water in the water is normal temperature, and the soaking time is: 1h. The pure water in the two...

Embodiment 2

[0050] The chemical strengthening method of lithium aluminum silicate glass, concrete steps are:

[0051] 1. Select lithium-aluminum-silicon products and preheat them in a preheating furnace. The preheating temperature is 370°C and the time is 3 hours;

[0052] 2. The preheated product is strengthened once, and the ratio of the strengthening liquid is: sodium nitrate: potassium nitrate = 75%. Strengthening time: 4h, strengthening temperature: 395°C.

[0053] 3. After the product is strengthened, move the product to the preheated furnace, open the furnace cover, and turn off the furnace heating switch, and cool down with the room temperature. When it is cooled to 100°C, perform pure water cleaning. The conditions for pure water cleaning are as follows: use pure water in two tanks for cleaning in sequence, the water tanks are flowing water, the water temperature in the first tank is 75°C, and the time is 30 minutes. , the temperature of the pure water in the second water tank ...

Embodiment 3

[0059] The chemical strengthening method of lithium aluminum silicate glass, concrete steps are:

[0060] 1. Select lithium-aluminum-silicon products and preheat them in a preheating furnace. The preheating temperature is 380°C and the time is 2.5 hours;

[0061] 2. The preheated product is strengthened once, and the proportion of the strengthening liquid is: sodium nitrate: potassium nitrate = 85%, and 0.5wt% of silicic acid is added to the strengthening liquid. Strengthening time: 5h, strengthening temperature: 390°C.

[0062] 3. After the product is strengthened, move the product to the preheated furnace, open the furnace cover, and turn off the furnace heating switch, and cool down with the room temperature. When cooled to 100°C, clean with pure water. The conditions for pure water cleaning are: clean with pure water from two tanks in sequence, the water tank is flowing water, the water temperature in the first tank is 65°C, and the time is 45 minutes. , the pure water t...

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Abstract

The invention discloses a method for chemically strengthening lithium-aluminosilicate glass, which comprises the following steps: 1) preheating the lithium-aluminosilicate glass for the first time, and then performing the first strengthening, using potassium nitrate and sodium nitrate to strengthen the salt solution The mixed molten liquid, the temperature for the first strengthening is 380°C~395°C, and the time is 4~6h; 2) The glass after the first strengthening treatment is dissipated, and then cleaned with pure water; 3) Step 2) The obtained glass is preheated for the second time, and then strengthened for the second time. The strengthening salt solution is a mixed molten liquid of potassium nitrate and sodium nitrate. The temperature for the second strengthening is 395°C~410°C, and the time is 2‑4h; 4) Two The product after the secondary strengthening is radiated, and finally cleaned with pure water to obtain the strengthened lithium aluminum silicate glass. The method provided by the invention can improve the CS and DOL of the product, better monitor the influence of the salt solution on the strengthening performance, and make the product have good impact resistance and bending resistance.

Description

technical field [0001] The technical field of glass preparation of the present invention particularly relates to a method for chemically strengthening lithium aluminum silicon glass. Background technique [0002] Strengthened glass has been widely used in electronic devices such as mobile phones, tablet computers, notebooks, and electronic watches. Therefore, the performance index of tempered glass is also a quality standard for measuring a product. How to improve the performance of existing products has become the top priority. [0003] Chemical strengthening is to place the product in a molten state of potassium nitrate or a mixed solution of sodium nitrate and potassium nitrate for a certain period of time. The Na+ ions with a smaller ionic radius in the glass and the larger K+ ions in the salt solution The ions are exchanged, and the Li+ ions in the glass are exchanged with the K+ ions and Na+ ions in the salt solution. Finally, compressive stress is formed on the sur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C21/00B08B3/12
CPCC03C21/002B08B3/12
Inventor 颜晓姜王洪杨渭巍宋占财崔秀珍王明忠
Owner XIANNING NANBO PHOTOELECTRIC GLASS CO LTD