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Additive and chemical tempering process for glass

A chemical tempering and additive technology, applied in glass tempering, glass manufacturing equipment, manufacturing tools, etc., can solve problems such as hindering ion exchange, accelerating ion exchange, etc., achieving stable ion exchange quality, increasing K+ concentration, and purifying molten salt. The effect of purity

Inactive Publication Date: 2012-06-20
CDGM OPTICAL GLASS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, CN1236670 has related reports on the influence of the formulation of molten salt on tempering performance. The catalyst added is composed of potassium silicate, silicon dioxide, potassium permanganate and manganese dioxide in a certain proportion. It can speed up the ion exchange and shorten the process time, but in actual production, the contamination of the molten salt by sample racks, heaters, heater replacement operations, etc. is inevitable, and the ion exchange will be hindered due to the contamination of the molten salt
CN1305965 discloses a method for manufacturing a chemically toughened glass disk substrate, the inhibitor used in it is Al 2 o 3 、K 2 SiO 3 and diatomaceous earth, and added to molten salt in a certain proportion, can prolong the life of molten salt for more than 6 months, but the inhibitor has no effect of accelerating ion exchange

Method used

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  • Additive and chemical tempering process for glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A chemical tempering process for glass, the method comprising the following steps:

[0015] (1) Process the sodium aluminum silicate system glass into a thin slice of 110mm×55mm×0.55mm;

[0016] (2) cleaning and drying the processed glass;

[0017] (3) the additive of the present invention is added KNO according to the weight ratio of 1: 24 3 In molten salt, heated to 410°C and kept at a constant temperature for 50 hours, the weight percent of additives is composed of: potassium hydroxide: 2%, potassium carbonate: 4%, diatomaceous earth 94%;

[0018] (4) Rapidly heat up the dried glass in step (2) to 350° C., and keep it warm for 50 minutes;

[0019] (5) Put the glass into the prepared molten salt and process it for 10 hours to carry out ion exchange;

[0020] (6) cooling and cleaning the ion-exchanged glass to obtain chemically tempered glass.

[0021] After the above ion exchange, a compressive stress layer of about 38um is formed on the glass surface, the surface...

Embodiment 2

[0023] (1) Process the sodium aluminum silicate system glass into a thin slice of 110mm×55mm×0.55mm;

[0024] (2) cleaning and drying the processed glass;

[0025] (3) The additive of the present invention is added KNO according to the weight ratio of 1: 20 3 In molten salt, heated to 440°C and kept at constant temperature for 24 hours, the weight percentage of additives is: potassium hydroxide: 4%, potassium carbonate: 6%, diatomaceous earth 90%;

[0026] (4) Rapidly heat up the dried glass in step (2) to 380° C., and keep it warm for 30 minutes;

[0027] (5) Put the glass into the prepared molten salt and process it for 4 hours to carry out ion exchange;

[0028] (6) cooling and cleaning the ion-exchanged glass to obtain chemically tempered glass.

[0029] After the above ion exchange, a compressive stress layer of about 38um is formed on the glass surface, the surface stress can reach about 950MPa, and the service life of the salt bath is ≥10 months.

Embodiment 3

[0031] (1) Process the soda-lime-silicon system glass into thin slices of 110mm×55mm×0.55mm;

[0032] (2) cleaning and drying the processed glass;

[0033] (3) the additive of the present invention is added KNO according to the weight ratio of 1: 17 3 In molten salt, heated to 400°C and kept at a constant temperature for 70 hours, the weight percentage of additives is: potassium hydroxide: 8%, potassium carbonate: 10%, diatomaceous earth 82%;

[0034] (4) Rapidly heat up the dried glass in step (2) to 300° C., and keep it warm for 90 minutes;

[0035] (5) Put the glass into the prepared molten salt and process it for 24 hours to carry out ion exchange;

[0036] (6) cooling and cleaning the ion-exchanged glass to obtain chemically tempered glass.

[0037] After the above ion exchange, a compressive stress layer of about 55um is formed on the glass surface, the surface stress can reach about 900MPa, and the service life of the salt bath is ≥10 months.

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Abstract

The invention provides an additive which can accelerate ion exchange, purify a molten salt and prolong the service life of the molten salt aiming at the KNO3 molten salt in low-temperature ion exchange. The additive comprises the following components in percentage by weight: 2 to 10 percent of potassium hydroxide, 4 to 12 percent of potassium carbonate and 78 to 94 percent of kieselguhr. The chemical tempering process for glass comprises the following steps of: (1) adding the additive into the KNO3 molten salt in a weight ratio of the additive to the KNO3 molten salt of (1:15)-(1:25), heating to the temperature of between 400 and 440 DEG C, and keeping constant temperature for 24 to 72 hours; (2) heating the glass to the temperature of between 300 and 380 DEG C, and keeping the temperature for 30 to 90 minutes; and (3) putting the glass into the molten salt, and processing for 4 to 24 hours to obtain chemical tempered glass. According to the chemical tempering process, the additive is added into the KNO3 molten salt, so impurities in the molten salt can be adsorbed, the molten salt is purified, the quality of the ion exchange is stabilized, the replacement frequency of the molten salt is reduced, the service life of the molten salt is prolonged, and the production cost is reduced.

Description

technical field [0001] The invention relates to a chemical tempering process of glass, in particular to a chemical additive composition and a chemical tempering process using the additive. Background technique [0002] With the rapid development of the IT and electronics industries, the demand for ultra-thin glass with a thickness of less than 1mm is rapidly increasing, and it is widely used in mobile phones, DVD panels, flat panel displays, etc., but ultra-thinness brings the mechanical strength of glass decrease. [0003] At present, there are many methods to improve the strength of glass in industrial production, one is the physical tempering method, but for ultra-thin glass, this method has the problem of glass deformation during the tempering process, and cannot be used in fields with high optical quality requirements. Internal application; the other is the liquid medium tempering method. Triplex in the UK used this method to produce glass with a thickness of 0.75-1.5m...

Claims

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Application Information

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IPC IPC(8): C03B27/03C03C21/00
Inventor 陈雪梅王作超于天来蒋世军
Owner CDGM OPTICAL GLASS
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