Polyurethane 중합에 있어서 isocyanate 경화제인 H12MDI와 IPDI의 혼합비율에 따른 물성변화를 조사하여, H12MDI 를 사용한 polyurethane resin은 단단하여 가공성 시험에서 밴딩 시 crack 발생이 심하게 일어났으며 IPDI는 비대칭적인 구조로 인하여 polyurethane resin의 구조가 얽혀 유연성을 가지므로 crack이 발생하지 않은 것으로 보인다. IPDI의 가교 도가 높아 혼합비율이 증가할수록 가공성, 내마모성, 내용제성에서도 향상됨을 알 수 있었다. 반면에, H12MDI의 혼합비 율이 높은 polyurethane resin은 코팅피막이 단단하여 내오염성에서는 우수한 결과를 얻었지만, 오히려 내용제성, 내마모성에서는 취약함을 나타냈으며 적외선 분광 스펙트럼 분석 결과와 실제 점도 경시변화를 관찰한 결과 H12MDI의 혼합비율이 증가할수록 보관 안정성은 높았으며, IPDI의 혼합비율이 높을수록 보관 안정성은 낮았다.

Two component polyurethane (PU) flame retardant coatings were prepared by blending trichloro modified polyesters (TCMPs) and isophorone diisocyanate isocyanurate. TCMPs were synthesized by polycondensation of trichlorobenzoic acid (TCBA), a flame retardant component, with adipic acid, 1,4 butanediol, and trimethylolpropane. The content of TCBA was varied in 10, 20, and 30 wt% for the reaction. Theses new flame retardant coatings showed various properties comparable to other non flame retardant coatings. Moreover, we carried out the combustion test and the flammability test for our flame retardant coatings. The results of vertical burning test for the coatings containing more than 20 wt% of TCBA were determined as no burn. The results of flammability test for the coatings with 20 wt% and 30 wt% of TCBA contents indicated the limiting oxygen index (LOI) values of 26% and 29% respectively, which implied relatively good flame retardancy.

It is attempted to develop flame retardant polyurethane coatings, which have received significant attention in recent years. It is the purpose of this study to synthesize new reactive polyurethane coatings containing halogen. Lactone based modified polyester polyols, using trichlorobenzoic acid as chlorine moiety (TBAOs) were synthesized. These polyesters were cured with isophorone diisocyanate (IPDI)-isocyanurate at room temperature (TBAPUs). Physical properties of these flame retardant coatings were similar with those of non-flame retardant coatings. The flammability of coatings was strongly dependent on the chlorine contents. We found that the increasing chlorine contents showed better flame retarding properties and that, however, they also resulted in more smog generation during combustion. The detailed results of flammability test using various methods indicated 24~26% in LOI and 3.7~5.3 cm char length in 45˚ Meckel burner method.

Chlorine-containing modified polyester polyols were synthesized by two-step condensation reactions. Intermediate was synthesized by the esterification of monochloroacetic acid with trimethylolpropane in the first step. Polycondensation of the intermediate (MCAOs), 1,4-butanediol, and trimethylolpropane with adipic acid was carried out. Two-component polyurethane (PU) coatings were prepared by blending MCAOs and IPDI-isocyanurate. There new flame-retardant coatings showed various properties comparable to other non-flame-retardant coatings. They were superior to flammable coatings from the experimental results showing rapid and 10 to 13 hours of pot-life. Coatings with 30wt% monochloroacetic acid was not flammable by the vertical flame retardancy test.