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Physical Properties and Flame Retardancy of PU Coatings Polymerized with Two Different Types of Isocyanates and Dichloro-Polyester Polyol  

양인모 (명지대학교 공과대학 화학공학과)
김성래 (명지대학교 공과대학 화학공학과)
박형진 (명지대학교 공과대학 화학공학과)
함현식 (명지대학교 공과대학 화학공학과)
우종표 (명지대학교 공과대학 화학공학과)
Publication Information
Polymer(Korea) / v.26, no.2, 2002 , pp. 193-199 More about this Journal
Abstract
The dichloro-polyester polyol (DCBAO) which was synthesized in our earlier work was cured at room temperature with two different type of curing agents including Desmodur N-3300 and Desmodur L-75 to get a polyurethane flame-retardant coatings (DCBAO/N-3300=DEBAN and DCBAO/L-75=DCBAL). We could not observe any deterioration of physical properties of the flame-retardant PU coatings (UCBAN and DCBAL) in comparison with the conventional PU coatings. Thermal resistance of DCBAL-type flame-retardant coatings, which was measured by yellowness index difference, was inferior to that of DCBAL-type PU coatings. We believe that this phenomena is attributed to the poor thermal resistance of Desmodur L-75 isocyanate. It was observed that the LOI values were 25∼26% for the PU coatings containing 20∼30 wt% of 2,4-dichlorobenzoic acid.
Keywords
dichloro-polyester polyol; isocyanate; PU flame-retardant coatings; LOI;
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