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-based high-efficiency water reducer. Background technique [0002] Polycarboxylate high-performance water reducer has many unique properties such as low dosage, high dispersibility, small slump loss, large degree of freedom in molecular structure, and easy modification. 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 condensate and sulfamate condensate, etc., while the research on polycarboxylate water reducer Whether it is in terms of raw material selection, production process or performance improvement, it started late. Although domestic researchers have achieved certain results in exploring polycarboxylate water reducer products through molecular approaches, relevant academic papers and research literature publ...

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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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