Organic silicon modified polycarboxylate superplasticizer and preparation method thereof

The invention relates to the technical field of water reducing agents, in particular to an organic silicon modified polycarboxylic acid water reducing agent and a preparation method thereof. The preparation method specifically comprises the following steps: step 1, carrying out ester exchange reaction on 2-acetamido-3-(2-naphthalene) methyl acrylate and a polyether monomer to prepare modified polyoxyethylene ether; 2, hydrogen-containing silicone oil and modified polyoxyethylene ether are subjected to a hydrosilylation reaction, organic silicon is grafted to a polyether chain, and organic silicon modified polyoxyethylene ether is prepared; and 3, carrying out polymerization reaction on the organic silicon modified polyoxyethylene ether and unsaturated acid to prepare the organic silicon modified polycarboxylate superplasticizer. The water reducing agent has excellent slump retaining performance, flowability and dispersity, so that a concrete product is more compact, and the strength of the concrete product is