Preparation and Physical Properties of Polyurethane Flame Retardant Coatings Using Phosphorus-Containing Lactone Modified Polyesters

By Hong-Soo Park, Soon-Yong Kwon, Kum-Jong Seo, Wan-Bin Im, Jong-Pyo Wu, Seong-Kil Kim

Two-component polyurethane flame retardant coatings were prepared using phosphorus-containing lactone modified polyesters (PLMPs) and polyisocyanate. PLMPs were synthesized by poly-condensation of dimethyl phenylphosphonate, a flame retardant component with polycaprolactone, adipic acid, and trimethylolpropane.

PLMPs were prepared with dimethyl phenylphosphonate con-tent from 10 to 20 wt%. It was found that various physical properties of these new flame retardant coatings were comparable to non-flame retardant coatings.

The flammability of coatings depends strongly on the dimethyl phenylphosphonate con-tent in PLMP. Coatings with 20 wt% dimethyl phenylphosphonate content did not burn in the vertical burning test.