Ion exchange process for thin glass chemical tempering and fused salt

A chemical tempering and ion exchange technology, applied in glass tempering, glass manufacturing equipment, manufacturing tools, etc., can solve the problems of affecting ion exchange, affecting the service life of molten salt, and reducing the transmittance of glass, and achieving a long service life. Effect

Inactive Publication Date: 2014-06-18
CHINA LUOYANG FLOAT GLASS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of ion exchange, a certain proportion of KOH is introduced, and OH- is highly corrosive, and its corrosion on the glass surface can lead to a decrease in the light transmittance of the glass
[0010] In the patents published above, the components in the auxiliary salt that play a role in purification (

Method used

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  • Ion exchange process for thin glass chemical tempering and fused salt
  • Ion exchange process for thin glass chemical tempering and fused salt
  • Ion exchange process for thin glass chemical tempering and fused salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 Wash the cut ordinary soda-lime-silica glass sheet with a thickness of 1.1mm and the alkali aluminosilicate glass with a thickness of 0.7mm (aluminum content is about 14%) with ultrasonic equipment, rinse with pure water and dry Standby, then put the clean original glass on the rack, put it together with the rack into the preheating furnace for preheating, the heating rate of the preheating furnace is 5°C per minute, and keep it warm for 30 minutes when it reaches 350°C , and then put the glass into molten salt for ion exchange. After the ion exchange, take out the glass and quickly put it into the annealing furnace to cool down. The temperature of the annealing furnace is 300°C; The glass is taken out of the furnace door, the molten salt attached to the glass surface is cleaned, dried and packaged.

[0033] Fresh molten salt (without adding KSb(OH) 6 ) 3 parts were stored in 3 molten salt tanks, and the effect of ion exchange was compared with different con...

Embodiment 2

[0045] With the repeated use of the molten salt tank, when the Na of the molten salt in the three molten salt tanks + Concentrations of 0.15%, 0.18%, and 0.2% were taken from 3 molten salt tank products, and 5 pieces of ordinary soda-lime-silica glass (sample 1) and alkali aluminosilicate glass (sample 2) were taken out for surface stress and The test of the depth of the stress layer, the test results are as follows:

[0046]

[0047]

[0048]

[0049] It can be seen from the above table that when Na in molten salt + When the concentration is 0.15% and ~0.2%, the surface stress of the glass begins to show a downward trend. + Add 1 part by weight of KSb(OH) to a molten salt tank with a concentration of 0.15% 6 , in Na + Add 1.5 parts by weight of KSb(OH) to the molten salt tank with a concentration of 0.18% 6 , in Na + Add 2 parts by weight of KSb(OH) to a molten salt tank with a concentration of 0.2% 6 , use the up and down movement of the hanging basket to fully ...

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Abstract

The invention relates to a thin glass tempering treatment technology, and in particular relates to fused salt for thin glass chemical tempering and a production process thereof. The main component of the fused salt is KNO3, and the auxiliary component is KCl, K2CO3, KSb(OH)6 and gamma-Al2O3, the warming speed of a pre-heating furnace in the production process is 5+/-0.5 DEG C per minute, heat preservation is performed for 30+/-5 minutes after the temperature is raised to 350+/-5 DEG C, and then the glass is placed in the fused salt so as to be subjected to the ion exchange; the glass subjected to the ion exchange is placed in an annealing furnace so as to be cooled, and the temperature of the annealing furnace is 300+/-5 DEG.C; a power source is turned off after the glass is placed therein, so as to slowly cool to 50+/-5 DEG.C, and then the glass is taken out so as to be cleaned, dried and packaged. The surface stress of the normal soda lime silica glass produced by the invention can achieve 650MPa and more, the stress layer depth can achieve 23microns and more; the surface stress of alkaline alumina silicate glass can achieve 850MPa and more, and the stress layer depth can achieve 40 microns and more.

Description

technical field [0001] The invention relates to a thin glass strengthening treatment technology, in particular to an ion exchange process and molten salt for chemical toughening of thin glass. Background technique [0002] With the development of information industry and optoelectronics industry, the application of ultra-thin flat glass is becoming more and more extensive, from traditional watch covers, instrumentation covers, etc. to plasma display protection screens, liquid crystal display protection screens, solar glass covers and mobile phone protection. It can effectively prevent impact and scratch damage on the screen surface of display products and prolong the service life of products. However, the strength of flat glass decreases sharply with the decrease of thickness, so the improvement of the strength of thin glass becomes more and more important. The physical tempering of glass was invented in the 1930s. After decades of development, it has played an important ro...

Claims

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Application Information

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IPC IPC(8): C03B27/03
Inventor 陈志红王艳霞王海顺刘学理刘宇权郎明田芳李红霞王自强秦岩
Owner CHINA LUOYANG FLOAT GLASS GROUP
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