트리포스포러스 변성폴리에스테르 함유 PU 난연도료의 도막물성

Physical Properties of Synthetic PU Flame-Retardant Coatings Containing Triphosphorus Modified Polyesters

The flame-retardant coatings were prepared by blending the synthesized triphosphorus modified polyester in the previous paper and hexamethylene diisocyanate-trimer and curing it at room temperature. The characterization of the films of the prepared coatings was performed. It was confirmed that no deterioration of physical properties of PU coatings was observed with the increasing phenylphosphonic acid (PPA) contents. Flame retardancy was tested by a 45° Meckel burner method and LOI method. With the 45° Meckel burner method, CATBTP-20C and CATBTP-30C that contain 20 wt% and 30 wt% of PPA, flame retarding component, respectively, showed the first grade flame retardancy with 2.8～3.9 cm of char length ; and, with LOI method, they exhibited a good flame retardancy as a range of 30～32% of combustion values.