Polyurethane Dispersions Derived From Soybean Oil Polyester Polyol

摘要

Soybean oil polyester polyol (SOPP) obtained from an ozonolysis technology has been employed to make aqueous polyurethane dispersions in two steps. In the first step, SOPP and neutralized dimethylol propionic acid (n-DMPA) was reacted with isophorone diisocyanate (IPDI) in the presence of acetone to form a prepolymer. In the second step the prepolymer was dispersed in water followed by acetone removal to obtain the polyurethane dispersions (PUDs). The PUDs had more than 40 wt% of SOPP and did not contain any volatile organic components (VOC). The glass transition temperature of the PUDs was decreased as the amount of SOPP content increased in the polymer backbone. The PUDs formed excellent films upon drying and the dried films had good water and chemical resistance. The PUDs were formulated into a chemical agent resistant paint and their performance was compared against commercially available control coatings based on petroleum derived PUDs. The experimental coatings resisted the chemical agent simulants slightly higher compared to the commercial control coatings.