Synthetic method for polycarboxylate type high slump-retaining water reducing agent at normal temperature

The invention belongs to the technical field of a synthetic method for a polycarboxylate type water reducing agent for concrete, and particularly discloses a synthetic method for a polycarboxylate type high slump-retaining water reducing agent at a normal temperature. The method takes unsaturated polyoxyethylene ether, unsaturated carboxylic acid, and an unsaturated sustained release monomer which can release carboxylic acid through hydrolysis in an alkaline environment of cement as the raw materials, and the polycarboxylate water reducing agent with high slump-retaining performance is synthesized with tap water at a normal temperature environment. The synthetic method has the advantages as follows: 1, the synthesis is performed at the normal temperature, so that energy consumption is reduced, and the method is environmental-friendly and economical; 2, the tap water is used for the synthesis, and the production cost is further saved; and 3, the sustained release monomer is added, accordingly, the product has higher slump-retaining performance, remote concrete delivery is achieved, and strong market competitiveness is provided.