Syntheses and physical properties of two-component polyurethane flame retardant coatings using chlorine-containing aliphatic modified polyesters

Two-component polyurethane flame retardant coatings were prepared by blending chlorine-containing modified polyesters(MCAOs) and polyisocyanate. MCAOs were synthesized by polycondensation of monochloroacetic acid, a flame retardant aliphatic carboxylic acid, with 1,4-butanediol, trimethylolpropane, and adipic acid. The content of monochloroacetic acid was varied 10, 20, and 30 wt% for the reaction. These new flame retardant coatings showed various properties comparable to other non-flame retardant coatings. They were superior to flamable coatings from the experimental results showing rapid and 9 to 11 hours of pot-life. Coatings with 30 wt% monochloroacetic acid was not flamable by the vertical flame-retardancy test.