Polyether class polycarboxylic acid high-efficiency water reducing agent and preparation method thereof

The invention relates to a polyether class polycarboxylic acid high-efficiency water reducing agent and a preparation method thereof, belonging to the field of concrete materials, structures and engineering of building materials. The polyether class polycarboxylic acid high-efficiency water reducing agent raises the temperature of water solutions of 15-55 mass percent of allyl polyethenoxy ether and 0-6 mass percent of chain transfer agent is raised to 50-90 DEG C, one side is dropwise added with a water solution of 0.01-0.9 mass percent of an evocating agent, one side is dripwise added with miscible liquids of 3-15 mass percent of unsaturated acids and one or more than one derivative thereof, the temperature is kept unchanged, and the water solution and the miscible liquids are completely dropped within 2-6 hours, the temperature is preserved for 1-6 hours and naturally cooled to room temperature, and the mixed solution is neutralized by sig water till a PH value reaches 6.8-7.2 so as to obtain the polyether class polycarboxylic acid high-efficiency water reducing agent. The polyether class polycarboxylic acid high-efficiency water reducing agent and the preparation method thereof have simple technique, low cost and good property, can effectively reduce the water-cement ratio of concrete, improves the compaction rate of a pore structure of the concrete, enhances the strength and the durability of the concrete and has great significance on enhancing the engineering quality, prolonging the service life, reducing the engineering cost, reducing the environment pollution, and the like.