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Method of regenerating molten salt for chemically toughening glass, and production method of toughened glass

A glass strengthening and molten salt technology, which is applied in the field of molten salt regeneration, can solve problems such as high cost, reduced processing efficiency, and increased frequency of molten salt exchange

Active Publication Date: 2015-05-20
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, there is concern that the exchange frequency of molten salt will increase, the cost will increase, and the processing efficiency will decrease due to downtime during exchange.

Method used

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  • Method of regenerating molten salt for chemically toughening glass, and production method of toughened glass
  • Method of regenerating molten salt for chemically toughening glass, and production method of toughened glass
  • Method of regenerating molten salt for chemically toughening glass, and production method of toughened glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2

[0102] [Example 1-2: Potassium nitrate molten salt]

Embodiment 1

[0108] (Example 1: Preparation and chemical strengthening of molten salt regenerated from a deteriorated state)

[0109] For the molten salt in the deteriorated state simulated in Test Example 2, potassium orthophosphate trihydrate (K 3 PO 4 ·3H 2 O) 20g (K 3 PO 4 6.0% by mass). Then, stir for 2 hours using a stirring motor and 4 helical blades, and let stand for 2 hours.

[0110] Soda lime glass and aluminosilicate glass were immersed in the molten salt thus obtained at 430° C. for 8 hours to perform chemical strengthening treatment. Thereafter, each glass was washed with ion-exchanged water at 100° C., and dried at 60° C. for 2 hours. CS and DOL after this treatment were measured respectively. The results are shown in Table 1.

Embodiment 2

[0111] (Example 2: Preparation and chemical strengthening of molten salt regenerated from a deteriorated state)

[0112] Potassium orthophosphate trihydrate (K 3 PO 4 ·3H 2 O) was changed to 30g (K 3 PO 4 8.8% by mass), except that, a regenerated molten salt was prepared in the same procedure as in Example 1, and CS and DOL of each glass after chemical strengthening using the regenerated molten salt were measured, respectively. The results are shown in Table 1.

[0113] Table 1

[0114]

[0115] From these results, it was found that regardless of the type of glass, by adding potassium orthophosphate to molten salt degraded by Na (Test Example 2), the CS value returned to 95% or more of the initial state (Test Example 1). The same CS value can be obtained in silicate glass, and a CS value exceeding the initial state can be obtained in soda lime glass. From this, it can be seen that the molten salt capable of imparting a high CS value to glass is regenerated (recovered...

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Abstract

The purpose of the present invention is to provide a method of regenerating molten salt which, when there is a reduction in the CS value of molten salt containing potassium nitrate used for chemically toughening glass, can restore said salt to a state in which a high CS value can be imparted. The present invention relates to a method of regenerating molten salt for use in glass strengthening which is used for forming a compressive stress layer on the glass surface by means of ion exchange, and involves a step in which the aforementioned molten salt contains potassium nitrate and a potassium orthophosphate is added to the molten salt after ion exchange treatment.

Description

technical field [0001] The present invention relates to a method for regenerating molten salt used to chemically strengthen glass when it deteriorates due to use, and further relates to a method for producing strengthened glass using molten salt regenerated by the method . Background technique [0002] In the cover glass of display devices such as digital cameras, mobile phones, and PDAs (Personal Digital Assistants, personal digital assistants), glass substrates for displays, etc., use chemically strengthened glass (hereinafter also referred to as chemically strengthened glass). Although glass has high theoretical strength, its strength will drop significantly due to damage. Compared with unstrengthened glass, chemically strengthened glass has higher mechanical strength and prevents damage to the glass surface, so it is suitable for these applications. [0003] The chemical strengthening treatment using ion exchange is to generate a compressive stress layer on the glass ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00
CPCC03C21/002
Inventor 山田拓仓岛和良渡边邦夫仁平敏史入泽润
Owner ASAHI GLASS CO LTD
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