Method for synthesizing polycarboxylate high-performance water reducer by copolymerization reaction of benzenesulfonate ester active macromonomer

Abstract

The invention discloses a method for synthesizing a high-performance polycarboxylic acid water reducing agent by copolymerization of benzenesulfonate active macromonomers, and belongs to the field of water reducing agents. The method comprises the following steps: modifying styrene sulfonate to obtain benzene sulfonyl halide, mixing high-value cerate and alcohol to form an oxidation-reduction initiator system to initiate polymerization of unsaturated cationic quaternary ammonium monomers to obtain a hydroxyl-terminated cationic long chain, respectively putting the hydroxyl-terminated cationic long chain and methoxy polyethylene glycol into the benzene sulfonyl halide for sulfonylation to prepare the benzenesulfonate active macromonomers with different structures, and performing free radical copolymerization on the benzenesulfonate active macromonomers and carboxylic acid small monomers to obtain the high-performance polycarboxylic acid water reducing agent. According to the method, the styrene sulfonate is modified to obtain the benzene sulfonyl halide, and a mode for performing sulfonylation on a cationic side chain and an ether side chain is adopted, so that the benzenesulfonate active macromonomers with different structures and different functions are synthesized, and the novel comb structured high-performance polycarboxylic acid water reducing agent with polycarboxylic acid serving as a main chain and cations and polyether which serve as multi-element side chains is obtained. The process is continuous and easy to control, and has multiple excellent effect of reducing water, retaining slumps, resisting clays and the.

Description

technical field [0001] The invention relates to the technical field of a benzenesulfonate-based polycarboxylic acid high-performance water reducer for concrete, in particular to a method of first modifying benzenesulfonyl halide with benzenesulfonate and then polymerizing cationic chains and sulfonylation reaction A specific preparation method of becoming a benzenesulfonate macromonomer and then copolymerizing with a carboxylic acid small monomer to form a polycarboxylate high-performance water reducer. Background technique [0002] Polycarboxylate high-performance water reducer is the third generation of high-performance water reducer developed after lignosulfonate-based water-reducers and naphthalene-based high-performance water-reducers. It has the highest technological content and the best application prospects at present. , an application-type superplasticizer with the best comprehensive performance. The superplasticizer has the advantages of low dosage, high water red...

AI Technical Summary

Problems solved by technology

Therefore, this requires the subversive innovation of the synthetic water reducer at the molecular structure level, not sticking to the traditional synthesis method, innovatively using benzenesulfonate to modify benzenesulfonyl halide, and high-valent cerium salt to trigger long-chain polycations. , and benzenesulfonyl halide sulfonylation of polycation side chains and polyether side chains to obtain a variety of synthetic routes and characteristics of benzenesulfonate-based reactive macromonomers, which not only have the composite performance of water-reducing and slump-resistant mud, At the same time, it is also beneficial to the promotion and application of industrialization. There has been no report on this aspect of work at home and abroad.

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