Low VOC polyurethane coating

A self-leveling, abras ion and scratch resistant finish wi th low level of volatile organic compounds emissions (VOC) for use on concrete or hardwood surfaces as floorings is formulated. The polyurethane (PU) finish is mainly comprised of vegetable based polyol resin admixed with methyl diphenyl diisocyanate (MDI). Additives such as organic fil lers and plasti cizers were also adde d to the resin and curing process was held at ambient temperature. Pot li fe and scratch resistance of the coati ng was evaluated and compared with commercial PU coatings. Results showed that the polyurethane top coat has a good adhesion over the base layer and the working time of the finish is high enough for any casting or coating applications.