Alkali-free substrate glass and thinning method thereof

Abstract

Alkali-free substrate glass comprises the components in percentage by mass: 58.9% to 62.5% of SiO2, 14.2% to 18.4% of Al2O3, 4.3% to 13.7% of B2O3, 1.4% to 1.9% of MgO, 4.1% to 7.6% of CaO, 1.0% to 2.1% of SrO, 0 to 8.3% of BaO and 0.1% to 0.2% of SnO2. The thinning method comprises the following steps: immersing the alkali-free substrate glass into a chemical etching solution composed of hydrofluoric acid, a glacial acetic acid surfactant and the balance being water, thinning the alkali-free substrate glass to 0.4 mm-0. 5mm, taking out the alkali-free substrate glass, and carrying out ultrasonic cleaning and drying; and placing the alkali-free substrate glass on a grinding disc of a grinding and polishing machine, and carrying out mechanical polishing, thinning the alkali-free substrate glass to 0.3 mm-0.35 mm, and thus obtaining the flexible substrate glass. The alkali-free substrate glass is reasonable in composition, the specific modulus value of the prepared alkali-free glass is moderate, the glass has good flexibility, the thinning method is convenient to operate, the alkali-free substrate glass with the thickness of 0.7 mm is thinned by combining two modes of chemical etching thinning and mechanical polishing thinning, and the flexible substrate glass with smooth surface and bendable performance is obtained.

Description

technical field [0001] The invention belongs to the field of flexible substrate glass manufacturing, and relates to an alkali-free substrate glass and a preparation method thereof. Background technique [0002] With the improvement of living standards, people's requirements for electronic display devices are developing in the direction of thinner, smarter, and more flexible, especially in recent years, electronic wearable devices, bendable smart phones and more realistic Curved surface display technology has given new flexible performance requirements to the ultra-thin glass that is the basis of electronic displays. According to flexible display products, the display screen can be divided into four types, namely flexible display with paper quality, flexible display with micro-curvature, foldable display and roll-up flexible display. The latter two types of flexible displays have very high requirements on the flexibility of the glass used, while the first two types of flexib...

AI Technical Summary

Problems solved by technology

Therefore, it is usually necessary to thin the relatively thick substrate glass. The commonly used thinning methods are divided into chemical etching thinning and mechanical polishing thinning. The existing substrate glass is very hard to use due to its high surface hardness. Therefore, chemical etching is often used to thin the glass, that is, the chemical etching solution is sprayed through the spray device to thin the glass, but this method will cause uneven etching on the glass surface and cause the glass surface to be rough, affecting product performance.

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