Composite antifoaming agent applicable to production of ordinary sheet glass

Abstract

The invention discloses a composite antifoaming agent applicable to production of ordinary sheet glass. The composite antifoaming agent is mainly prepared from main components and solvent components, wherein the main components include a foam breaker prepared from titanium compounds, a bubble wall thinning agent prepared from sodium sulfate and calcium sulfate, and a solvent burning efficiency optimizer ferrocene; the solvent components contain diesel oil, aviation kerosene, heavy oil or a mixture thereof according to any ratio; the flashing point of the solvent is more than or equal to 38 DEG C; and the main components are dissolved in the solvent or suspended in the solvent in a solid particle state. According to the composite antifoaming agent disclosed by the invention, new bubbles are produced on bubble walls of floating molten glass so as to achieve the effect of thinning the bubble walls. Meanwhile, bubble breakage is promoted by reducing local viscosity and surface tension of the bubble walls, so that the effect of accelerating breakage of the bubble layer on the molten glass surface in different temperature areas of a kiln without increasing the highest temperature of the ordinary sheet glass kiln can be achieved. Therefore, the bubble removal efficiency in the molten glass is improved, and the influence on bubble defects of the ordinary sheet glass is reduced.

Description

Technical field [0001] The invention belongs to the technical field of melting during the production of ordinary flat glass, and more specifically relates to a composite defoamer suitable for the production of ordinary flat glass. Background technique [0002] In the production process of ordinary flat glass, CO releases due to the high temperature decomposition and melting of raw materials such as silica sand, sulfate, carbonate, etc. 2 , SO 2 , H 2 A large amount of gas such as O forms a large number of bubbles in the molten glass. The bubble layer almost covers the non-material covered area of ​​the ordinary flat glass furnace. The thickness of the bubble layer is 10mm-100mm. The existence of bubble defects in the molten glass seriously affects the ordinary flat plate. The qualification rate of glass products has become an important factor affecting production efficiency. [0003] Generally, in order to reduce the bubbles in the molten glass, the bubble radius can be increased b...

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Problems solved by technology

[0004] However, although the use of clarifying agent can promote the increase of a large number of bubble diameters to float to the surface of the glass liquid, since the surface tension of the glass liquid itself does not change, except for a few bubbles with particularly large diameters, they will rupture after floating to the surface of the glass liquid. After the bubbles float to the surface of the molten glass, they will gather together and stack up to form a foam layer. The existence of the foam layer prevents the floating efficiency of the bubbles in the molten glass on the one hand, and on the other hand, it will form between the molten glass and the burning flame on the upper part of the kiln. A layer of reflective and heat-insulating layer, which affects the absorption of heat by the glass liquid

By continuously heating the glass liquid to promote the discharge and bursting of the bubbles, on the one hand, the existence of the foam layer will affect the heating efficiency; In order to ensure the bursting of all bubbles on the surface of the molten glass, the temperature of the molten glass must be heated to a very high level, which will consume a lot of energy. At the same time, the long-term ultra-high temperature will also affect the overall life of ordinary flat glass furnaces.

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