Synthesis method of slump-retaining polycarboxylic acid high-performance water-reducing agent

Abstract

The invention discloses a synthesis method of a slump-retaining polycarboxylic acid high-performance water-reducing agent. The synthesis method comprises the following synthesis steps: firstly, addingdeionized water and methallyl alcohol polyoxyethylene ether into a reaction still, stirring and heating to 60+ / -2 DEG C; secondly, preparing a solution I: adding the deionized water, ascorbic acid and thiohydracrylic acid; preparing a solution II: adding the deionized water and acrylic acid; thirdly, preparing a solution III: adding the deionized water, the ascorbic acid and the thiohydracrylic acid; preparing a solution IV: adding the deionized water and the acrylic acid; fourthly, adding hydrogen peroxide into the first step, uniformly dropwise adding the solution I and the solution II prepared in the second step respectively; then dropwise adding the solution III and the solution IV prepared in the third step; fifthly, carrying out aging reaction for 60 minutes; sixthly, reducing the temperature to below 45 DEG C, adding caustic soda liquid containing 30 percent of sodium hydroxide and neutralizing until a pH value is 6 or so. The synthesis method has the beneficial effects that production cycle is shortened from original 5 to 6 hours to 3 hours now and the qualification rate of a product is increased from original 80 to 90 percent to 100 percent now.

Description

technical field [0001] The invention relates to a concrete additive, in particular to a synthesis method of a slump-preserving polycarboxylate high-performance water reducer. Background technique [0002] The existing polycarboxylic acid high-performance water reducer is synthesized by solution polymerization at normal pressure and a certain temperature. Most of the polymerized monomers are uniformly added dropwise in about 3 hours, and then aged at a certain temperature for a certain period of time. The supply and demand are 5-6 hours, the production cycle is long, the production efficiency is low, the product quality is unstable, and the product qualification rate is only 80-90%. Contents of the invention [0003] The purpose of the present invention is to make up for the deficiencies of the prior art, and to provide a slump-preserving polycarboxylate high-performance water reducer that shortens the production cycle from the original 5 to 6 hours to about 3 hours and imp...

AI Technical Summary

Problems solved by technology

[0002] The existing polycarboxylic acid high-performance water reducer is synthesized by solution polymerization at normal pressure and a certain temperature. Most of the polymerized monomers are uniformly added dropwise in about 3 hours, and then aged at a certain temperature for a certain period of time. The supply and demand are 5-6 hours, the production cycle is long, the production efficiency is low, the product quality is unstable, and the product qualification rate is only 80-90%