Study on Synthesis of Waterborne Polyurethane

The anionic waterborne polyurethane was synthesized by the reaction of toluene di-isocyanate(TDI) with polyester glycol and dimethlolpropionic acid(DMPA) with the process ofprepolymerization step by step and self-emulsification.Studied the factors which influence the re-action.The results show that the performances of emulsion is optimum when NCO/OH ratio is 1.5~2.3 and the amount of DMPA is 3%~8%.