Preparation method of polycarboxylic acids high efficiency water reducer

Abstract

The invention discloses a preparation method of polycarboxylic acids high efficiency water reducer, which includes steps of firstly synthesizing methoxypoly(ethylene glycol) monomethyl ether acrylate large monomer from methoxypoly(ethylene glycol) monomethyl ether and crylic acid which are used as raw materials, then copolymerizing the esterified large monomer and the acrylic acid to prepare the polycarboxylic acids high efficiency water reducer. In the synthesis of the esterified large monomer, hydroquinones and hydroquinone monomethyl ether are employed to coordinatedly blocking polymerization, thereby reducing failure ratio of unsaturated double bond, increasing effective content of the synthesized water reducer, increasing concrete water reducing ratio, and increasing slump retaining performance.

Description

Technical field [0001] The invention belongs to a chemical preparation method, in particular to a preparation method of a polycarboxylic acid series superplasticizer. Background technique [0002] Polycarboxylic acid high-performance water-reducing agent has many unique properties such as low content, high dispersibility, small slump loss, large freedom of molecular structure, and easy modification. In the past ten years in China, the main products for the research and development of new superplasticizers and superplasticizers are naphthalenesulfonate methane condensate and sulfamate condensate, and the research on polycarboxylic acid-based water reducers Whether in terms of raw material selection, production technology or performance improvement, it started late. Although domestic researchers have achieved certain results in exploring polycarboxylic acid-based water-reducing agent products through molecular channels, from relevant academic papers and research documents published...

AI Technical Summary

Problems solved by technology

In the past ten years in China, the main products of research and development of new high-efficiency water reducers and superplasticizers are naphthalenesulfonate formazan condensates and sulfamate condensates, etc., while the research on polycarboxylate water reducers Whether it is in terms of raw material selection, production technology or performance improvement, it started late. Although domestic researchers have achieved certain results in exploring polycarboxylate-based water reducers through molecular approaches, relevant academic papers and research literature published in China, And according to the published Chinese patent literature, most of the domestic development of polycarboxylate superplasticizer products is in the laboratory stage, and there are still very few manufacturers that actually form products, which is far from meeting the needs of the development of high-performance concrete.

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