Tempered boroaluminosilicate glass free of color change

Abstract

The invention relates to chemically tempered antimicrobial boroaluminosilicate glass free of color change. The boroaluminosilicate glass is characterized in that the content of B2O3 can meet the following relational expression as shown in the specification, wherein M2O is the sum of content of all monovalent metal oxides in the glass; MO is the sum of content of all divalent metal oxides in the glass; RO is the sum of all multivalent element oxides with potential reducing capacity in the glass; all content in the formula is based on mole percents of oxides; and the content of RO is based on the mole percents of the oxide with the highest cation valence. The glass can be tempered in a salt bath containing 0-5wt% of silver nitrate, so that high strength and excellent antibacterial property are obtained in one step; and high transmittance and colorless features are kept. The glass can be used as protecting glass of touch screens of mobile phones or other electronic equipment, can also be used as surfaces of any high-strength, scratch-resistant, transparent and antimicrobial equipment and apparatuses, which are frequently touched by people in hospitals and communal facilities, or even the surfaces of buildings.

Description

technical field [0001] The present invention relates generally to boroaluminosilicate glass which can be chemically toughened, and further relates to boroaluminosilicate glass which has no discoloration after being chemically toughened in a silver-containing salt bath. Antimicrobial boroaluminosilicate glass, and more particularly, the present invention relates to antimicrobial boroaluminosilicate glass chemically toughened by exchanging silver ions with alkali metal ions in the glass to achieve antimicrobial and no discoloration, and its Manufacturing method. In particular, the present invention relates to cover glass, back glass for devices with touch screens, such as mobile electronic devices. Background technique [0002] Electronic devices with touch screens, such as tablet computers and mobile phones, have become more and more popular in people's daily life. Glass is widely used on these devices to protect their touch screens and improve the user experience at the sa...

AI Technical Summary

Problems solved by technology

However, with such low AgNO 3 The concentration may cause two problems as follows: one problem is that, as worried in US2012 / 0034435A1, it is difficult to form a high enough silver ion concentration on the glass surface to achieve excellent antimicrobial properties; another problem is that, according to our Calculate and repeat test results, for AgNO 3 and KNO 3 Such a small amount of AgNO in the mixed salt bath 3 , is easily consumed in the large-scale practical production of antimicrobial touch screen protective glass, which means that the AgNO must be accurately controlled in this salt bath 3 Concentration is very difficult

Silver-containing ion exchange is considered to be one of the most cost-effective methods of producing this glass. However, ordinary glass is prone to discoloration in silver-containing ion exchange, which has become a major difficulty in the popularization and application of this technology.

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