Hydroxyl-terminated polyether macromonomer and preparation method thereof as well as low-temperature rapid dispersion type ether polycarboxylic acid water reducing agent and preparation method of low-temperature rapid dispersion type ether polycarboxylic acid water reducing agent

The invention relates to the technical field of concrete admixtures, in particular to a hydroxyl-terminated polyether macromonomer, a preparation method of the hydroxyl-terminated polyether macromonomer, a low-temperature rapid dispersing type ether polycarboxylic acid water reducing agent and a preparation method of the low-temperature rapid dispersing type ether polycarboxylic acid water reducing agent. The ether polycarboxylic acid water reducing agent is formed by copolymerizing hydroxyl-terminated polyether macromonomer, acrylic acid and functional monomer C through copolymerization reaction. Compared with the prior art, the ether polycarboxylic acid water reducing agent prepared by adopting the specific hydroxyl-terminated polyether macromonomer has the advantages that the adsorption rate and the early-stage adsorption capacity of the ether polycarboxylic acid water reducing agent on the surface of cement particles are remarkably improved, the adsorption capacity of the water reducing agent in the later