Method for synthesizing ultrahigh-viscosity water-soluble block polyether by one-pot method

Abstract

The invention relates to a method for synthesizing ultrahigh-viscosity water-soluble block polyether by a one-pot process, which comprises the following steps: placing a compound containing reactive hydrogen in a reaction kettle, adding a phosphazene catalyst to catalyze nucleophilic substitution reaction between the reactive hydrogen and initial polyether, vacuumizing, and heating to 130-150 DEG C in the reaction kettle; introducing a mixture of ethylene oxide and propylene oxide into the reaction kettle, and carrying out nucleophilic substitution reaction on the mixture and reactive hydrogen to generate polyether polyol; introducing ethylene oxide into the reaction kettle to generate ethylene oxide-terminated polyether polyol; after the reaction is finished, aging until the pressure in the reaction kettle is unchanged; introducing an isocyanate cross-linking agent; reacting the primary hydroxyl group in the ethylene oxide terminated polyether polyol of the primary hydroxyl group to generate macromolecular polyether polyol; and vacuumizing to remove the solvent to obtain the ultrahigh-viscosity water-soluble block polyether. The alkali metal content in the polyether is reduced, the molecular weight of the polyether is improved, and the viscosity of the water-soluble block polyether is increased.

Description

technical field

[0001] The invention relates to a method for synthesizing an ultra-high-viscosity water-soluble block polyether by a one-pot method, and belongs to the technical field of negative electrode materials for sodium-ion batteries. Background technique

[0002] Water-soluble polymer polyether is an important raw material for synthetic and semi-synthetic metalworking fluids. The existing technology is to combine active hydrogen initiator compounds with ethylene oxide and propylene oxide under the action of a basic catalyst. Such compounds are polymerized to form high-viscosity macromolecular compounds. The disadvantage is that it is very difficult to synthesize polyether with a molecular weight of more than 100,000 due to the limitation of traditional basic catalysts. The introduced ethylene oxide and propylene oxide are prone to self-polymerization, which will not only lead to turbidity of the product, but also lead to The molecular weight does not meet the expect...