Synthesis method of polytetrahydrofuran ether glycol modified polymer polyol

The invention belongs to the technical field of polymer polyol, and particularly relates to a synthesis method of polytetrahydrofuran ether glycol modified polymer polyol. Comprising the following steps: synthesis of basic polyether polyol: heating and dehydrating small molecule polyether, polytetrahydrofuran ether glycol and a DMC bimetallic catalyst, and adding epoxypropane for polymerization to obtain the basic polyether polyol; preparing a mixed material: uniformly mixing basic polyether polyol, a prefabricated stabilizer, a chain transfer agent, an initiator, styrene and an acrylonitrile monomer to obtain the mixed material; and synthesis of the polytetrahydrofuran glycol modified polymer polyol: adding the basic polyether polyol and the prefabricated stabilizer into a reaction kettle, heating, then adding the mixed material for polymerization, and after the reaction is finished, vacuumizing to remove the chain transfer agent to obtain the polytetrahydrofuran glycol modified polymer polyol. By introducin