Isolating agent used for producing redispersible emulsion powder and preparation method for the isolating agent

Abstract

The invention discloses an isolating agent used for producing redispersible emulsion powder. The isolating agent is prepared from following materials by weight: 30-65% of heavy calcium carbonate powder, 30-65% of water-washed kaolin, 1-10% of talcum powder, 0.1-5% of precipitated hydrated silica and 1-8% of diatomite. The preparation method comprises steps of adding the heavy calcium carbonate powder, the water-washed kaolin, the talcum powder, the precipitated hydrated silica and the diatomite according to the weight ratio into an agitator and mixing uniformly to obtain a finished product of the redispersible emulsion powder. According to the isolating agent and the preparation method, materials, which have good adsorbability, good combination with the emulsion powder, good isolating effects, capability of adjusting the material unit weight and certain moisture absorption capability, are composited together, thereby furthest guaranteeing isolating effects of the isolating agent, reducing generation of caking phenomena of the redispersible emulsion powder in production, transportation and storage processes, improving the fineness qualified rate to be higher than 98% of finished products of a drying tower, and improving the yield of the drying tower.

Description

technical field [0001] The invention relates to building materials, in particular to a release agent for producing redispersible latex powder for dry powder mortar and a preparation method thereof. Background technique [0002] Redispersible latex powder is a white solid powder obtained by spray-drying special latex. It is mainly used as an important additive for "dry-mixed mortar" and other dry-mixed mortars for external wall insulation engineering construction materials. The commonly used redispersible latex powder is a copolymer of vinyl acetate, which is a white powder that can slide freely and can be well dispersed in water to form a stable emulsion with the same performance as the original latex. [0003] As an indispensable additive material in dry-mixed mortar products, redispersible latex powder plays a significant role in cement dry-mixed mortar. It can improve the bond strength and cohesion of the material. Improve the elastic bending strength and flexural stren...

AI Technical Summary

Problems solved by technology

[0016] However, due to some problems in the formulation and preparation method of the prior art release agent for the production of redispersible latex powder, the latex particles are not uniform and fine enough when used for the production of redispersible latex powder. Adhesion and agglomeration are prone to occur during the process

thus affecting its use

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