Method for mixed application of sodium silicate binder and polyving akohol

Abstract

The invention relates to a method for mixed application of a sodium silicate binder and polyving akohol and belongs to the technical field of loose material bonded molding. The technical scheme is that the method comprises the following steps of: (1) respectively adding respective loose materials in the sodium silicate solution and the polyving akohol solution independently for respectively mixing and stirring; (2) mixing the loose material containing the sodium silicate and that containing the polyving akohol for secondary stirring to obtain the mixed loose material; and (3) conveying the mixed loose material into a press for pressure forming. The method for mixed application of a sodium silicate binder and polyving akohol disclosed by the invention has the positive effects of preventing the phenomenon of losing the bonding capability caused by 'jelling' after two binder liquids are mixed, bonding the loose material by making the best of the water-resistance and instantaneous caking properties of the 'gel' generated during 'jelling' at the same time, reducing the breakage rate after the loose material is molded as the bonded loose material is provided with strong instantaneous initial strength after being molded, and obtaining the water-resistance property which is lacking when the sodium silicate and the polyving akohol are independently used.

Description

technical field [0001] The invention relates to a method for mixing sodium silicate and polyvinyl alcohol as a binder, which fully utilizes the "gelation" phenomenon that occurs after the two binders are miscible to carry out bonding and pressure molding of loose materials, which belongs to the loose material bonding method. Combined technology field. Background technique [0002] Sodium silicate (also known as sodium silicate, water glass, etc.) and polyvinyl alcohol are two cheap binders, but their water resistance is too poor when used alone. In order to improve its water resistance and enhance its cohesiveness, the background technology adopts adding a small amount of sodium silicate in a certain proportion to improve its water resistance in polyvinyl alcohol. However, because the molecular concentration of sodium silicate is too low in the mixed solution , water resistance is not ideal. Generally, the addition ratio of sodium silicate and polyvinyl alcohol is strictly...

AI Technical Summary

Problems solved by technology

[0002] Sodium silicate (also known as sodium silicate, water glass, etc.) and polyvinyl alcohol are two cheap binders, but the water resistance is too poor when used alone

In order to improve its water resistance and enhance its cohesiveness, the background technology adopts adding a small amount of sodium silicate in a certain proportion to improve its water resistance in polyvinyl alcohol. However, because the molecular concentration of sodium silicate is too low in the mixed solution , water resistance is not ideal

Generally, the addition ratio of sodium silicate and polyvinyl alcohol is strictly limited to about 1:12 (mass ratio), and the water resistance is poor within this ratio range. If the ratio is too high, the mixed solution of the two will become elastic semi-solid and lose Adhesiveness

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