Study the Effect of Different Ratios of Anionic Internal Emulsifier On a Aqueous Polyurethane Model

Aqueous polyurethane dispersions were synthesized via the prepolymer mixing process using anionic internal emulsifier. N,N-Bis (2-hydroxyethyl)-2-amino ethane sulfonic acid sodium salt (BES sodium salt) was used as internal emulsifier and ionic center. There are many parameters in the synthesis of aqueous polyurethanedispersions. In this research, different ratios of ionic center and chain extender were used. Also, the effect of the BES sodium salt content on thermal stability of PU dispersion cast films and solution properties such as average particle size and viscosity were studied. Increased content of ionic center caused lower average particle size and higher viscosity and thermal stability