Oxidized lignin polycarboxylate salt, preparation method, and use as a water reducer

Abstract

The present application belongs to the technical field of functional additives for concrete materials, in particular relates to an oxidized lignin polycarboxylate salt, and further discloses its use for preparing high-efficiency water reducer. The method for preparing oxidized lignin polycarboxylate salt as described in the present application involves oxidizing and modifying lignin under alkaline conditions, and polymerizing oxidized lignin, carboxylic acid based small monomers and alkenyl polyethylene glycol ether as monomers to obtain oxidized lignin polycarboxylate salt that can be used as an high-efficiency water reducer. The oxidized lignin polycarboxylate water reducer described in the present application, compared with traditional polycarboxylate based water reducer, replaces all or part of traditional carboxylic acid based small monomers with lignin based carboxylic acid monomers, which not only reduces the cost of polycarboxylate water reducer but also improves their slump retention ability, and has significant cost-effectiveness and environmental protection benefits.

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