In the prepolymer polyurethane dispersion method, if the use of water soluble binary primary amine chain extender chain extension, because the reaction rate of a NCO and a NH2 is fast, it is not easy to get a fine and uniform emulsion, can use ketoimine or keto nitrogen method to solve this problem.Ketimine - ketone even nitrogen method is to protect the pre polymers and ketone of diamine (ketone imide system) or hydrazine (after mixing ketone even nitrogen system), and water dispersion, dispersion process, ketimine, even nitrogen at a certain rate of ketone, hydrolysis, release free diamine or hydrazine and dispersed polymer particle reaction, the waterborne polyurethane - urea with good performance.

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