Isocyanato-terminated prepolymer was prepared by using polyethylene glycol(PEG) and toluene diisocyanate(TDI)

and using dimetholpropionic acid(DMPA) as hydrophilic agent

waterborne polyurethanes were synthesized by cross-linking reaction.The formula and technology of waterborne polyurethanes were studied

and the effects of hydrophilic group concentration

neutralizing agent concentration and neutralizing value on properties of waterborne polyurethanes also were investigated.Finally

waterborne polyurethanes were modified with dimetholethyl ester.Ionic groups were introduced into the chain of polyurethanes so that it could be self-emulsified.The formula of synthesized waterborne polyurethanes with better storage stability were that: total ratio of-NCO toOH

the ratio of-NCO to-OH

neutralizing degree

and volume ratio of dimetholethyl ester to waterborne polyurethanes were 1.3/1

3.5/1

80%

60/40

respectively.