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http://dx.doi.org/10.12925/jkocs.2007.24.1.4

Application of Modified Polyesters Containing Phosphorus/Chlorine to PU Flame-Retardant Coatings  

Park, Hong-Soo (Department of Chemical Engineering, Myongji University)
Kim, Song-Hyoung (Department of Chemical Engineering, Myongji University)
Hong, Seok-Young (Department of Chemical Engineering, Myongji University)
Yoo, Gyu-Yeol (Department of Chemical Engineering, Myongji University)
Ahn, Sung-Hwan (Department of Chemical Engineering, Myongji University)
Hahm, Hyun-Sik (Department of Chemical Engineering, Myongji University)
Kim, Seung-Jin (Korea Institute of Construction Materials)
Kim, Young-Geun (Korea Institute of Construction Materials)
Publication Information
Journal of the Korean Applied Science and Technology / v.24, no.1, 2007 , pp. 31-46 More about this Journal
Abstract
This study was focused on the maximization of flame-retardancy of polyesters by a synergism of simultaneously introduced chlorine and phosphorus into polymer chains of modified polyesters. To prepare modified polyesters, reaction intermediates, TD-adduct (prepared from trimethylolpropane/2,4-dichlorobenzoic acid (2,4-DCBA)) and TMBO (prepared from tetramethylene bis(orthophosphate)), were prepared first, then condensation polymerization of the prepared intermediates, adipic acid, and 1,4-butanediol were carried out. In the condensation polymerization, the content of phosphorus was fixed to be 2%, and the content of 2,4-DCBA that provides chlorine component was varied to be 10, 20, and 30wt%, and we designated the prepared modified polyesters containing chlorine and phosphorus as ABTT-10C, -20C, -30C. Two-component PU flame-retardant coatings (ABTTC, ABTTC-10C, ABTTC-20C, ABTTC-30C) were prepared by the curing of synthesized ABTTs with a curing agent of allophanate/trimer at room temperature. To examine the film properties of the prepared PU flame-retardant coatings, film specimens were prepared with the prepared coatings. The film properties of ABTTC, ABTTC-10C and ABTTC-20C, which contain 0, 10 and 20wt% 2,4-DCBA, respectively, were proved to be good, whereas the film properties of ABTTC-30C, which contains 30wt% 2,4-DCBA, was proved to be a little bit poor. Two kinds of flame retardancy tests, $^{\circ}45Meckel$ burner method and LOI method were performed. With the $^{\circ}45Meckel$ burner method, three flame-retardant coatings except ABTTC showed less than 3.4cm of char length, and showed less than 2 seconds of afterflaming and afterglow. From this result, the prepared flame-retardant coatings were proved to have the 1st grade flame retardancy. With the LOI method, the LOI values of the coatings containing more than 10wt% 2,4-DCBA were higher than 30%, which means that the coatings possess good flame retardancy. From these results, it was found that synergistic effect in flame retardancy was taken place by the introduced phosphorus and chlorine.
Keywords
PU flame-retardant coatings; phosphorus; chlorine; modified polyesters;
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