POLYURETHANE DISPERSIONS DERIVED FROM SOYBEAN OIL POLYESTER POLYOL

摘要

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