A chemical tempering method for ultrathin unequal-thickness glass

A chemical tempering and non-uniform thickness technology, which is applied in the tempering of glass, glass manufacturing equipment, manufacturing tools, etc., to achieve the effect of excellent bending performance, high bending times, and small bending radius

Inactive Publication Date: 2021-09-03
芜湖东信光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above technical problems, the present invention provides a method for chemical tempering of ultra-thin non-equal thickness glass, by performing coating protection on the non-equal thickness region of non-equal thickness glass, and blocking part of the ion exchange during the chemical tempering process It avoids warpage in non-equal thickness areas or insufficient tempering in equal thickness areas during the tempering process, and improves the overall impact strength and bending performance

Method used

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  • A chemical tempering method for ultrathin unequal-thickness glass
  • A chemical tempering method for ultrathin unequal-thickness glass

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Experimental program
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Effect test

Embodiment 1

[0043] The method for chemically tempering the above non-equal thickness glass comprises the following steps:

[0044] 1) Coating of the non-equal thickness area: After covering the surface of the non-equal thickness area 3 of the non-equal thickness glass with PET film protection, the upper surface of the non-equal thickness area 2 of the non-equal thickness glass is protected by coating. The film used The material is silicon dioxide, and the thickness of the coating is

[0045] 2) Chemical tempering: put 98-100% solid potassium nitrate into the chemical tempering tank, and heat the chemical tempering tank through the resistance wire heating system at a heating temperature of 450-470°C for 24-48 hours to chemically toughen The solid potassium nitrate in the tank is melted from solid to liquid to form a molten salt solution.

[0046] Put the non-equal thickness glass into the preheating furnace to heat, the preheating temperature is 370-400℃, put the non-equal thickness gla...

Embodiment 2

[0050] The difference from Example 1 is that the thickness of the coating film on the upper surface of the non-equal thickness region is The film material used is indium tin oxide. Put the non-equal thickness glass after coating into the preheating furnace for heating. The preheating temperature is 370-400°C. ℃, soaking for 10-60min, tempering is completed, after cooling, film peeling, cleaning, drying, inspection and packaging in the later stage, it will leave the factory.

[0051] After the above chemical tempering treatment, the thickness of the stress layer in the equal thickness zone 3 is 10-11μm, the stress value after tempering is 650-700MPa, the pen-down impact strength of the equal thickness zone is 46-48cm, and the pencil hardness is 7H; non-equal thickness The thickness of the stress layer in the non-uniform thickness area is 6-7μm, the stress value is 500-560MPa, the pen-down impact strength of the non-uniform thickness area is 28-30cm, and the pencil hardness is ...

Embodiment 3

[0053] The difference from Embodiment 1 and Embodiment 2 is that the thickness of the coating film on the upper surface of the non-equal thickness region is The film material used is antimony tin oxide. Put the non-equal thickness glass after coating into the preheating furnace for heating. The preheating temperature is 370-400°C. ℃, soaking for 10-60min, tempering is completed, after cooling, film peeling, cleaning, drying, inspection and packaging in the later stage, it will leave the factory.

[0054] After the above chemical tempering treatment, the thickness of the stress layer in the equal thickness area is 11-12μm, and the stress value after tempering is 700-750MPa; the pen-down impact strength of the equal thickness area is 46-50cm, and the pencil hardness is 7H; the non-equal thickness area The thickness of the stress layer is 7-8μm, the stress value after tempering is 550-600MPa, the pen-down impact strength is 28-30cm, and the pencil hardness is 3H; the bending rad...

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Abstract

A chemical tempering method for ultrathin unequal-thickness glass belongs to the technical field of chemical tempering methods for ultrathin glass, and comprises the following steps: 1) covering the surface of an equal-thickness area of the unequal-thickness glass with a PET film for protection, and then coating the upper surface of the unequal-thickness area of the unequal-thickness glass with a film for protection; 2) putting the coated unequal-thickness glass into a tempering liquid for tempering treatment, so that the stress layer thickness of a tempered unequal-thickness area is 6-8 microns, the stress value is 500-600MPa, the stress layer thickness of a tempered uniform-thickness area is 10-12 microns, and the stress value is 650-750MPa; and (3) carrying out film stripping, cleaning, drying, inspection, packaging and delivery on the tempered unequal-thickness glass cooled to normal temperature. The method has the beneficial effects that the non-uniform-thickness area of the unequal-thickness glass is subjected to film coating protection, so that an effect of blocking part of ion exchange in the chemical tempering process is achieved, so that the ultra-thin glass has excellent bending performance, high impact resistance and scratch resistance.

Description

technical field [0001] The invention relates to the technical field of ultra-thin glass chemical tempering methods, in particular to a chemical tempering method for ultra-thin non-uniform thickness glass. Background technique [0002] With the upgrading of electronic products, people's pursuit of the glass cover tends to be thinner and lighter. The emergence of folding screens has attracted widespread attention from all walks of life. Since 2019, well-known electronic display manufacturers such as Samsung and Huawei have successively launched folding screens. At the same time, the crease problem of polyimide CPI also appears with the increase of the number of folds; ultra-thin glass (Ultra-Thin Glass, UTG) refers to glass with a thickness of less than 100 μm and is flexible. In 2020, the Galaxy series of Samsung Electronics used ultra-thin glass for the first time in the mobile phone cover. Due to its small size, thin thickness, good resilience, and no crease after bending 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B27/03C03C23/00
CPCC03B27/03C03C23/00
Inventor 郑建军徐炯杨夫舜岳伟齐彦杰
Owner 芜湖东信光电科技有限公司
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