Polycarboxylic acid water reducing agent special for precast concrete and preparation technology thereof

Abstract

The invention belongs to the technical field of polycarboxylic acid water reducing agents, and particularly relates to a polycarboxylic acid water reducing agent special for precast concrete and a preparation technology thereof. The polycarboxylic acid water reducing agent is prepared from, by weight, 300-320 parts of polyether macromonomer, 35-40 parts of methacrylic acid, 3.5-5.5 parts of a chain transfer agent, 8-13 parts of unsaturated monocarboxylic acid, 3-20 parts of unsaturated amphoteric quaternary phosphate, 2.5-5.5 parts of calcium sulfate, 1.0-2.5 parts of anhydrous sodium sulphate, 1.5-2.5 parts of a reductant, 1.0-3.0 parts of an oxidizing agent, 0.50-0.65 part of vitamin C waste mother liquid, 10-20 parts of sodium hydroxide and an appropriate amount of deionized water; a first solution, a second solution, a third solution and a fourth solution are dropwise added in materials obtained in S3, dropwise adding is completed within 0.4 h, and heat preservation is conducted for 2.0-3.0 h after dripwise adding is finished. Accordingly, design is ingenious, the ingredients are reasonable, the performance is good, the preparation method is simple, and the polycarboxylic acidwater reducing agent is suitable for application and popularization.

Description

technical field [0001] The invention relates to the technical field of polycarboxylate water reducer, in particular to a special polycarboxylate water reducer for prefabricated concrete and a preparation process thereof. Background technique [0002] Water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of concrete basically unchanged. Most of them are anionic surfactants, such as lignosulfonate, naphthalenesulfonate formaldehyde polymer, etc. After being added to the concrete mixture, it can disperse the cement particles, improve its workability, reduce the unit water consumption, improve the fluidity of the concrete mixture; or reduce the unit cement consumption and save cement. Polycarboxylate high-performance water reducer is a concrete superplasticizer (water reducer) with the most cutting-edge technology, the highest technology content, the best application prospect and the best comprehensive performance in the wo...

AI Technical Summary

Problems solved by technology

[0003] Existing polycarboxylate superplasticizers tend to cause problems such as excessively long setting time of concrete and lower compressive strength ratio, and greatly increase the cost

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