Method for synthesizing solid polycarboxylic acid water reducing agent

Abstract

The invention provides a method for synthesizing a solid polycarboxylic water reducing agent, comprising the following steps: using a monomer containing the nonsaturated group to react with an organic solvent, after the reaction, adding an alkaline substance for neutralization, and carrying out centrifugation to obtain a polycarboxylic acid water reducer, then drying the prepared polycarboxylic acid water reducer to obtain the solid polycarboxylic acid water reducing agent. By using a low temperature method to prepare the solid polycarboxylic acid water reducing agent , the crosslinking of the polycarboxylic acid water reducer due to high temperature spray drying is avoided, and the structure of the polycarboxylic acid water reducer is destroyed, thus the solid polycarboxylic acid water reducing agent with excellent performance is obtained.

Description

technical field

[0001] The invention relates to a production method of a concrete admixture, in particular to a method for synthesizing a solid polycarboxylate water reducer. Background technique

[0002] Water reducer has become an indispensable fifth component in concrete, and more and more attention has been paid to it. Polycarboxylate superplasticizer is a kind of superplasticizer with better comprehensive performance. Its high water reducing rate and good slump retention are beyond the reach of previous naphthalene or aliphatic water reducers. of. Now polycarboxylate superplasticizers are mostly 10-50% liquid products. Due to their superior performance, they are more and more used in various key projects. However, sometimes the construction site is far away, resulting in continuous increase in transportation costs, so the development of high-concentration or solid polycarboxylate products is the primary condition for reducing transportation costs and promoting the wid...