STUDY ON PREPARATION OF SEALED POLYURETHANE EMULSION

Firstly,the prepolymer based on toluene2,4diisocyanate(TDI),poly(propylene glycol)210(PPC210)and dimethylolpropionic acid(DMPA)were synthesized in the paper.After a chainextension reaction with 1,4butanediol,the prepolymer was sealed by nbutanol,following by a neutralization process with triethyamine(TEA).Finally,the system was dispersed into water.Then the nonpolluting polyurethane emulsion,an easily use one,was gained.And the characters of the sealed polyurethane were also compared with that of the nosealed one in the paper.