Method for Reducing Stress of Strengthened Glass and Recycling Method for Defective Glass Products

A technology of strengthening glass and stress, applied in the field of touch screen production, can solve the problems of easy cracking, large residual stress, large size change, etc., to facilitate re-strengthening or cutting processing, reduce the stress of tempered glass, and reduce the size of the effect.

Active Publication Date: 2021-10-26
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 of reducing reinforcing glass stress, including the following steps:

[0047] A) Preheating: The lithium silicate induced glass is preheated at 290 ° C for 2 h; wherein the lithium silicate-enhanced glass in the present embodiment is a non-counterfeit product produced during the production of the touch screen, and its surface stress CS is 820 MPa, strengthened The depth DOL is 8UM, the inflection point stress CSK is 120MPa, the bending stress is 600MPa, the Vickers hardness is 700 hV;

[0048] B) ion exchange: Preheating the reinforced glass placed in a mixed molten salt of sodium nitrate and lithium nitrate, ion exchange at 400 ° C for 60 min, wherein

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

[0050] The surface stress CS obtained after ion exchange was 70-80 MPa, the reinforced depth DOL was 8-9 um, the bending stress is 320-350MPa, and the Vickers hardnes...

Embodiment 2

[0052] This embodiment is a method of reducing the reinforced glass stress, and is different from the first embodiment in that the preheating in the present embodiment is preheating the lithium silicate to warm the glass at 310 ° C for 3 h, other process parameters and implementation Example 1 is the same.

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

Embodiment 3

[0055] This embodiment is a method of reducing the reinforcing glass stress, and is different from the second embodiment, in the mixed molten salt used in the ion exchange process, the weight percentage of sodium nitrate is 75%, weight of lithium nitrate. The percentage is 25%, and the other process parameters is the same as in Example 2.

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

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Abstract

The invention provides a method for reducing the stress of tempered glass and a method for recycling defective glass products, and relates to the field of touch screen production. The method for reducing the stress of tempered glass includes the following steps: A) preheating: placing the lithium silicate tempered glass in a Preheating at 290-350°C for 2-5h; B) ion exchange: placing the preheated tempered glass in a mixed molten salt of sodium nitrate and lithium nitrate, and ion-exchanging at 382-450°C for 10-120min, wherein, In the mixed molten salt, the weight percent of the sodium nitrate is 71-79%, and the weight percent of the lithium nitrate is 21-29%. Using the method for reducing the stress of the strengthened glass can alleviate the lack of a technical problem in the prior art that is suitable for eliminating the stress of the lithium silicate strengthened glass, and achieve the purpose of reducing or eliminating the stress of the lithium silicate strengthened glass.

Description

Technical field [0001] The present invention relates to the field of touch screen production, and more particularly to a method of reducing the reinforced glass stress and a recovery method of a glass-defective product. Background technique [0002] Chemical strengthening glass is widely used in electronic fields such as mobile phones, watches, and computers. With the increasing demand of glass products, the number of glass cracking waste is gradually increased, and if these waste glasses are directly scrapped, they will Severe waste resources and production costs. If it is considered for repeated use or secondary processing of these waste, it has a stress residue on the surface of the glass product after the strengthening, and cracking occurs during the cutting point of the product during the cutting process, causing the glass product to fracture. That is, the reinforced glass product does not perform secondary processing, and it is necessary to eliminate the stress in the reinf...

Claims

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Application Information

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