PREPARATION AND PHYSICAL-PROPERTIES OF 2-COMPONENT POLYURETHANE FLAME-RETARDANT COATINGS USING TRICHLORO MODIFIED POLYESTERS

Trichloro modified polyester polyols were synthesized by two-step cond ensation reactions. An intermediate compound was synthesized by the es terification of trichloroacetic acid with trimethylolpropane in the fi rst step. In the next step, polycondensation of the intermediate, 1,4- butanediol and trimethylolpropane with adipic acid was carried out. Tw o-component flame-retardant polyurethane coatings were prepared by ble nding these modified polyester polyols and polyisocyanate. The physica l properties of these new coatings were comparable to non-flame-retard ant coatings. They showed a drying time of 3-4 h and a pot life time o f 10-13 h, which could belong to the flame-retardant coatings with lon g pot life times. Coating with 20 wt % trichloroacetic acid showed a s elf-extinguishing property in the vertical burning test. (C) 1998 John Wiley & Sons, Inc.