Preparation method of anti-mud polycarboxylic water reducer

Abstract

The invention relates to an anti-mud polycarboxylic water reducer and a preparation method thereof and belongs to the field of water reducers. The preparation method of the water reducer comprises the steps of (1) preparing quaternary ammonium salt oligomer: allowing epibromohydrin and tertiary amine compound aqueous solutions to react by the action of a composite initiator in a mixed solvent of low alcohol and water when a system pH (potential of hydrogen) value is 1-2, then performing reduced pressure distillation, and obtaining light yellow viscous quaternary ammonium salt oligomer, and (2) preparing the anti-mud polycarboxylic water reducer, performing radical copolymerization on quaternary ammonium salt oligomer, isopentene alcohol ethoxylate, amino trimethylene phosphonic acid, unsaturated monocarboxylic acid and a derivative of unsaturated monocarboxylic acid by the action of an initiator and a chain transfer agent to form the colorless to light yellow transparent polycarboxylic water reducer. An adverse effect of a mud content of aggregate in concrete on the polycarboxylic water reducer can be avoided, and the problems of insufficient water reduction, great slump loss and lower strength of the concrete are solved on the premise that the mixing amount of the polycarboxylic water reducer is not increased.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, in particular to a mud-resistant polycarboxylate water reducer, and in particular to a preparation method of the polycarboxylate water reducer. Background technique [0002] Polycarboxylate water reducer is more and more widely used in concrete engineering because of its excellent properties such as high water reducing rate, high slump retention, high reinforcement and high durability. However, a large number of engineering examples and studies have shown that compared with naphthalene-based, melamine-based and sulfamic acid-based water-reducers, polycarboxylate-based water-reducers are more sensitive to the clay content of aggregates, mainly manifested as polycarbonate-based water-reducers. The water-reducing and dispersing ability of the carboxylic acid-based water-reducing agent is severely reduced, and the slump-preserving effect is poor, resulting in a decre...

AI Technical Summary

Problems solved by technology

The use of this polycarboxylate water reducer when the aggregate mud content is high can avoid the adverse effect of the aggregate mud content on the polycarboxylate water reducer in ready-mixed concrete, without increasing the polycarboxylate water reducer. Solve the problems of insufficient water reduction, large slump loss, and low strength of concrete under the premise of the amount of water reducing agent

Images