Method for preparing concrete water reducer with styrene sulfonate as monomers

Abstract

The invention discloses a method for preparing a concrete water reducer with styrene sulfonate as monomers, and belongs to the field of water reducers. The method includes the steps that firstly, styrene sulfonate and unsaturated carboxylic acid monomers are subjected to free radical copolymerization to obtain a polycarboxylic acid-styrene sulfonate main chain, and then benzene sulfonate on the main chain is modified into phenylsulfonyl halide groups; then, an oxidation-reduction initiating system is formed by high-valence cerate and alcohol to initiate polymerization of unsaturated cationic quaternary ammonium monomers to obtain a hydroxyl-terminated cationic long chain; then, the polycarboxylic acid main chain containing the phenylsulfonyl halide groups, the hydroxyl-terminated cationic long chain and a polyethylene glycol compound are subjected to sulfonylation to obtain the concrete water reducer. According to the method, based on the molecular structure design principle, by modifying styrene sulfonate into phenylsulfonyl halide and carrying out sulfonylation on grafted cationic side chains and polyethylene glycol side chains, the novel concrete water reducer containing a double-side-chain structure is successfully synthesized; the reaction process is mild, easy to control, capable of saving energy and efficient, and the concrete water reducer shows multiple excellent effects of water reduction for slump loss resistance, clay resistance and the like.

Description

technical field [0001] The invention relates to the technical field of preparing concrete water reducer by using p-styrene sulfonate as a monomer, in particular to a kind of main chain polymerization and then modification using unsaturated carboxylic acid monomer and p-styrene sulfonate A specific preparation method for synthesizing a concrete water reducing agent by polymerizing cationic side chains with benzenesulfonyl halides and then sulfonylation of the main side chains. Background technique [0002] With the continuous development of high-performance concrete technology, the research on high-performance water reducers is also advancing accordingly. The third-generation concrete water reducer with polycarboxylic acid as the main molecular structure - polycarboxylate water reducer, with its With the advantages of low water reducing rate, high water reducing rate, and large degree of freedom in molecular design, it is gradually becoming the most important member of the co...

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Problems solved by technology

However, the products obtained by the above synthesis methods all have certain deficiencies. From the perspective of molecular structure design and synthesis, researchers have not been able to modify the structure of benzenesulfonyl halides through carboxylic acid-styrenesulfonate copolymers and graft them. The method of polymerizing cationic side chains under the high-valent cerium salt trigger system realizes the composite functional chemical admixture that combines water reduction, slump retention, dispersion, and mud resistance.

The above method of synthesizing a macromonomer only through acylation reaction, or synthesizing a single functional side chain, or introducing a cationic block into the main chain greatly limits its application and improvement effect. It has been proved by fact

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