The invention discloses a preparation method of high molecular
polyethylene polyamine polyether used for preparing water-based functional liquids. The method adopts
polyethylene polyamine and a mixture of
propylene oxide and
ethylene oxide as raw materials, and employs
sodium hydride or
potassium hydride as a catalyst to conduct a
polymerization reaction so as to obtain the high molecular
polyethylene polyamine polyether used for preparing water-based functional liquids. The invention preferably selects a two-step
polymerization method as the preparation process. And the prepared high molecular polyether has the characteristics of high molecular weight, narrow distribution and high
viscosity, etc., thus being suitable to be used for preparing hydraulic liquids,
quenching liquids, and
cutting fluids, etc. And the prepared water-based functional liquids have especially outstanding thickening property,
viscosity-temperature property and shearing resistance, thus having prolonged service life. The average molecular weight of the high molecular polyether prepared by the method of the invention can reach 30000-35000, 40000-45000, 50000-55000, 60000-65000, 70000-75000, and 80000-90000, the molecular
weight distribution coefficient MW / MN is 1.4-1.9, the
viscosity range at 100DEG C can be 20000-50000mm<2> / s, and the viscosity-temperature index can be up to 240-260DEG C.