Heat source-free short-time preparation method of controlled-release type polycarboxylic acid high-performance slump retaining agent

Abstract

The invention relates to a polycarboxylate superplasticizer, and particularly relates to a heat source-free short-time preparation method of a controlled-release type polycarboxylic acid high-performance slump retaining agent. The heat source-free short-time preparation method comprises the following steps: adding methyl allyl polyethenoxy ether and water in a container, after stirring for 0.5 hour at normal temperature, adding an initiator and an initiation additive, stirring for 2min at normal temperature; titrating a mixed water solution of acrylic acid, hydroxyethyl acrylate and 2-acrylamide-2-methylacrylsulfonate, and a chain transfer agent water solution simultaneously within 1 hour, then insulating heat for 0.5 hour, regulating a pH value to 6-7 by adopting an alkaline liquor, and finally diluting by adding water until the solid content is 40 percent. The heat source-free short-time preparation method is simple in preparation process, simple in equipment, and free from heating in the whole reaction process so that energy resources are saved; the production period is only 2 hours, and thus the production efficiency is greatly increased, and the application range is wide; and the synthesized controlled-release type polycarboxylic acid high-performance slump retaining agent has the characteristics of less doping amount, good slump retaining property, environment friendliness and the like.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer, in particular to a short-time preparation method of a slow-release polycarboxylate high-performance slump-retaining agent without a heat source. Background technique [0002] At present, my country is vigorously developing infrastructure, and the demand for commercial concrete is strong, and the market share of polycarboxylate superplasticizer, which is one of commercial concrete admixtures, is increasing. In the fierce market competition, products with high water reduction rate, slump retention effect and low cost will have a competitive advantage, which is also the direction that various scientific research institutions and enterprises are constantly pursuing. [0003] In the preparation process of polycarboxylate water reducer, it is generally necessary to select some monomer materials with different groups, and then synthesize the polymerizable structural unit into a water reducer with prede...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a short-time preparation method without a heat source of a slow-release polycarboxylic acid high-performance slump-retaining agent. The method takes unsaturated polyoxyethylene ether and hydroxyethyl acrylate as main raw materials, and at normal temperature, A polycarboxylate superplasticizer with slow release and high slump retention performance was synthesized in a short period of time to solve the problem of insufficient slump retention ability of current polyether polycarboxylate superplasticizers

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