Zinc-boron-silicon system heat-resisting environmental-friendly emulsion opal glass and preparation method thereof

Abstract

The invention relates to zinc-boron-silicon heat-resisting environmental-friendly emulsion opal glass and a preparation method thereof. The glass is characterized by consisting of the following components in percentage by mass: 68-78% of SiO2, 0-4% of Al2O3, 10-15% of B2o3, 5-8% of ZnO, 0.5-3% of CaO, 0-2% of MgO, 2.5-4.5% of alkali metal oxide and 1-5% of P2O5. The preparation method comprises the steps of: preparing the components into a glass batch and melting; then moulding by casting; and annealing to obtain the emulsion opal glass. The method is environmental-friendly and free of pollution and the glass does not contain fluorine, has less erosion to the refractory matters and is molded in one step; and compared with the conventional emulsion opal glass, the prepared zinc-boron-silicon heat-resisting environmental-friendly emulsion opal glass is low in thermal expansion coefficient, stable in opacification, less in environment pollution, less in corrosivity of refractory matters, high in opacity, less in phosphorus volatilization and good in glossiness.

Description

technical field [0001] The invention belongs to the field of opaque glass and its preparation, and in particular relates to a heat-resistant and environment-friendly opaque glass of a zinc borosilicate system and a preparation method thereof. Background technique [0002] Opalescent glass refers to the glass in which a large number of particles with a refractive index different from that of the main glass are dispersed in the glass. When light passes through the glass, it is opaque due to refraction or reflection of the particles. When the particle size is reduced to the order of magnitude of the incident visible light wavelength, diffraction opacification is also produced. These highly dispersed particles can be droplet phase produced by glass phase separation, precipitated crystals, unexhausted tiny bubbles, or even unmelted oxide particles. When the particle size is larger than the wavelength of the incident light, it will produce Mie scattering, showing milky white; if ...

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Problems solved by technology

[0005] The 2008 Patent Publication No. CN101234851A describes mixed opacity glass containing phosphorus and fluorine. The fluorine added in it corrodes the refractory material and endangers the health of operators. In actual production, the economic and social benefits are relatively low

In 2009, the application number is 200910238115.3, which is suitable for all-electric melting and heating forming opacity glass. The 3-4wt% fluoride in the formula, although the all-electric melting technology has been used to reduce the volatilization of fluoride, but the erosion of refractory materials It also greatly reduces the life of the kiln

[0006] Although the opacified glass described in the 2008 Patent Publication No. 101182117 does not contain fluorine, the opacified glass in this system needs to be opacified at 700-900°C for the original glass, and the heat treatment time is 2-6 months. Hours, this process consumes a lot of energy and resources, and is not conducive to continuous industrial mass production

[0007] It can be seen that the existing opacity glass is harmful to the environment and human health, and the milkiness of the product is low and unstable, and some require secondary heat treatment (generally 4-8 hours), which not only consumes a lot of energy but is not conducive to continuous production

The heat resistance of the product is poor, so it is difficult to be suitable for modern household appliances such as microwave ovens and ovens

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