Formula for light environment-friendly alkali-free boron-alumina silicate glass used in liquid crystal display (LCD)

Abstract

Provided is a formula for light environment-friendly alkali-free boron-alumina silicate glass used in a liquid crystal display (LCD). SnO in the formula can be obtained easily, is nontoxic and can eliminate bulbs in alkali-free glass when being separately used as a glass clarifying agent. Melting temperature of ZnO can be reduced so that liquidus temperature can be reduced, and excellent crystallization-resisting properties can be achieved. Basic physical properties of the liquid crystal substrate prepared through the formula can stably reach that: coefficient of thermal expansion is lower than 35*10-7 / DEG C, temperature of strain point is higher than 670 DEG C, density is lower than 2.41g / cm<3>, liquidus temperature is lower than 1100 DEG C, liquidus viscosity is larger than 250,000 poises, and bulbs with diameter larger than 0.1mm in per kilogram of glass are invisible.

Description

technical field [0001] The invention belongs to the field of glass manufacturing, and relates to a formula for making substrate glass used on a flat panel display LCD, in particular to a formula for light, environment-friendly alkali-free boroaluminosilicate glass used for TFT-LCD. Background technique [0002] At present, with the rapid popularization of portable electronic devices (such as notebook computers, smart phones, and PDAs), higher requirements are placed on the lightweight of accessories. As a result, higher requirements are placed on the composition of the glass substrate to ensure that it meets the needs of modern liquid crystal displays. The glass substrate must have the following characteristics: contain alkali metal oxides less than 1000ppm; have chemical resistance; the thermal expansion coefficient must be similar to the silicon of the thin film transistor; increase the glass strain point to reduce thermal shrinkage; have a smaller density to facilitate P...

AI Technical Summary

Problems solved by technology

[0010] The present invention is in order to solve the MgO in the prescription of existing glass substrate that TFT-LCD is used to make glass devitrify, cause glass liquidus temperature to rise; Clarifying agent As 2 o 3 The toxicity is very strong, the technical problems of polluting the environment and threatening human health, and a formulation of a lightweight and environmentally friendly alkali-free boroaluminosilicate glass for LCD is designed, which provides a kind of even without using the clarifier As 2 o 3 , and can also make the surface of the glass substrate free of bubble defects. The ZnO in this formula can lower the melting temperature, lower the liquidus temperature, and have better anti-devitrification performance