DISPERSANT FOR POLYMER POLYOL AND PREPARATION METHOD OF POLYMER POLYOL

摘要

The invention discloses a dispersant for polymer polyol and a preparation method of polymer polyol, wherein the dispersant is a copolymer macromolecule prepared by the propylene oxide or ethylene oxide with an average molecular weight of 6000 to 20000, with containing at least one benzene ring group and one polymerizable carbon-carbon double or triple bond polymer. The preparation method of the dispersant is: synthesizing a basic polyether polyol, adding a cyclic dicarboxylic anhydride into the polyether polyol, then the polyether polyol is reacted with an epoxy compound with the polymerizable double bond, and capping with an epoxy compound to obtain the dispersant; preparing the polymer polyol by the basic polyol, an unsaturated vinyl monomer styrene and acrylonitrile, a polymerization initiator, the dispersant and an optional chain transfer agent; the basic polyether is a polyether polyol with a functionality of 3 to 8. The invention can obtain a stable, colorless and transparent dispersant, and the POP prepared therefrom has not only a relatively low viscosity, but also fine particles, high whiteness and good water solubility.