Method for reducing stress of tempered glass and method for recycling defective products of glass

A technology for strengthening glass and stress, applied in the field of touch screen production, can solve problems such as large residual stress, increased product stress value, and unsatisfactory stress relief effect, and achieve the effect of easy re-strengthening and stress relief.

Active Publication Date: 2019-03-01
LENS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional aluminate glass, the expansion coefficient of lithium silicate glass is larger, and the existing method for eliminating glass stress is not suitable for lithium silicate glass. Using the existing method to treat lithium silicate glass, its The effect of stress relief is not ideal, the residual stress after treatment is large, and the size changes greatly, so secondary processing such as re-strengthening or cutting cannot be carried out
Lithium silicate glass cannot be directly used for secondary processing after strengthening. The reasons are as follows: ①The product is easy to break when cutting; ②The surface polished product is easy to warp; continue to expand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment is a method for reducing the stress of strengthened glass, comprising the following steps:

[0047] A) Preheating: Preheat the lithium silicate strengthened glass at 290°C for 2 hours; wherein, the lithium silicate strengthened glass in this example is a defective product produced during the production of the touch screen, and its surface stress CS is 820MPa. The depth DOL is 8um, the inflection point stress CSK is 120MPa, the average bending stress is 600MPa, and the Vickers hardness is 700HV;

[0048] B) Ion exchange: place the preheated strengthened glass in a mixed molten salt of sodium nitrate and lithium nitrate, and perform ion exchange at 400°C for 60 minutes, wherein,

[0049] In the mixed molten salt, the weight percentage of sodium nitrate is 71%, and the weight percentage of lithium nitrate is 29%;

[0050] The surface stress CS obtained after ion exchange is 70-80MPa, the strengthening depth DOL is 8-9um, the average bending stress is 320-3...

Embodiment 2

[0052] This example is a method for reducing the stress of strengthened glass. The difference from Example 1 is that the preheating in this example is to preheat the lithium silicate strengthened glass at 310°C for 3 hours. Other process parameters are the same as those in the implementation Example 1 is the same.

[0053] The surface stress CS obtained after ion exchange is 70-80MPa, the strengthening depth DOL is 8-9um, the average bending stress is 320-350MPa, and the Vickers hardness is 500-520HV.

Embodiment 3

[0055] This embodiment is a method for reducing the stress of strengthened glass. The difference from Embodiment 2 is that in the mixed molten salt used in the ion exchange process in this embodiment, the weight percentage of sodium nitrate is 75%, and the weight percentage of lithium nitrate Percentage is 25%, and other processing parameters are identical with embodiment 2.

[0056] The surface stress CS obtained after ion exchange is 60-70MPa, the strengthening depth DOL is 8.5-9.5um, the average bending stress is 350-380MPa, and the Vickers hardness is 480-500HV.

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Abstract

The invention provides a method for reducing stress of tempered glass and a method for recycling defective products of glass and relates to the field of production of touch screens. The method for reducing stress of tempered glass comprises the following steps: (A), preheating: preheating lithium silicate tempered glass for 2-5 hours at 290-350 DEG C; (B) ion exchange: placing the preheated tempered glass in mixed fused salt of sodium nitrate and lithium nitrate and carrying out ion exchange for 10-120 minutes at 382-450 DEG C, wherein the weight percentage of sodium nitrate in the mixed fusedsalt is 71-79%; the weight percentage of lithium nitrate in the mixed fused salt is 21-29%. The method for reducing the stress of the tempered glass can be used for relieving the problem that a technology for eliminating the stress of the lithium nitrate tempered glass is lacked in the prior art; the purpose of reducing or eliminating the stress of the lithium nitrate tempered glass is achieved.

Description

technical field [0001] The invention relates to the field of touch screen production, in particular to a method for reducing the stress of strengthened glass and a method for recycling defective glass products. Background technique [0002] Chemically strengthened glass is widely used in electronic fields such as mobile phones, watches, and computer touch panels. With the increasingly stringent requirements for the appearance of glass products, the number of broken glass after strengthening is gradually increasing. If these waste glass is directly scrapped, it will be Serious waste of resources and production costs. However, if the waste glass is considered to be reused or reprocessed, there will be stress residues on the surface of the strengthened glass product, and cracks will appear at the cutting point of the product during the cutting process, causing the glass product to split. That is to say, the strengthened glass product cannot be subjected to secondary processing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00
CPCC03C21/002
Inventor 周群飞王天碧
Owner LENS TECH
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