Technique for reducing hydroxyl group content in glass

Abstract

Disclosed is a technology for reducing hydroxyl group content in glass. Adding hydroxyl group remover CCI4 to a glass burden until all burden is immersed in the CCI4 liquid, resting the burden in aeration-drying environment, then puting the glass burden in a low-temperature muffle furnace, simultaneously keeping aerating environment to remove decay products of CCI4, the muffle electric stove is slowly heated up to 500-700 DEG C and the heat preservation time is 0.5-3 hours, and then the glass burden in the muffle furnace is transferred into a high-heat glass-melting furnace for melting. Glass with low hydroxyl group content prepared by the technology of the invention has the advantages of low costs, simplicity and easy operation, prominent de-watering effects and the like.

Description

technical field [0001] The invention relates to a new process for reducing the hydroxyl content in glass. Background technique [0002] The hydroxyl group in the glass structure is one of the main impurities affecting the properties of the glass. The presence of the hydroxyl group in the glass causes a series of changes in the properties of the glass. Different studies have shown that the presence of water leads to lower glass viscosity, lower softening temperature, and chemical stability. Deterioration, lower refractive index, lower density, lower elastic modulus, and shortened static fatigue life, while increasing the dielectric loss and dielectric constant of the glass, the thermal expansion coefficient, the crystallization rate, and the structure relaxation rate increases, etc. In particular, the hydroxyl groups in the glass structure will cause the glass to produce strong absorption near the near-infrared region, and produce complex overtone absorption with other compo...

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Problems solved by technology

The treatment effect of this method is better, but the technical process is relatively complicated, and there are mainly the following problems:

Due to the need to feed gas into the high-temperature electric furnace, holes must be reserved on the top of the electric furnace, and the refractory materials used in the high-temperature electric furnace are all brittle materials, and the furnace will often be scrapped when the existing electric furnace is rebuilt

[0005] 2. The operation is dangerous and harmful to the environment

[0007] 3. The chloride produced by the pyrolysis of carbon tetrachloride has a very serious corrosion effect on the silicon-molybdenum rod of the heating element of the electric furnace, which greatly reduces the service life of the silicon-molybdenum rod

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