Application of BES Sodium Salt to Synthesis Water-based Polyurethane Coatings

A series of the waterborne polyurethane dispersions with different ratios of sulfonated ionic center were synthesized via the prepolymer mixing method. In this research, N,N-bis(2-hydroxyethyl)-2-aminoethane sulfonic acid sodium salt (BES sodium salt) has been used as anionic internal emulsifier and ionic center to prepare of the samples for the first time. In this paper, the synthesis route for preparing waterborne polyurethane and structure of a typical sample based on 100% BES is explained by IR spectroscopy. In this synthesis method, the additional step of neutralization is not necessary as used in the conventional procedures. This point is important because it is not only economic but also saves the time