Flame Retardant Effect of Isocyanate Trimer on Polyisocyanurate Foam

Mingyang Du, Chunze He, Canhui Zhou


The effect of Isocyanate trimer on the flame retardancy mechanism of polyisocyanurate (PIR) foam was studied through 3 aspects including the mechanism of thermal decomposition stage in condensed phase, the barrier mechanism of carbon layer formation on the surface in condensed phase and the mechanism in gaseous phase by using infrared spectroscopy, scanning electron microscopy, thermal analysis, cone calorimeter, high temperature pyrolysis gas chromatography mass spectrometry. The results show that the trimer can improve the thermal stability of the PIR foam and is not easily decomposed in the combustion. The trimer can increase the carbon content of the PIR foam to 29.9% than that of the polyurethane (PU) foam. The carbon layer formed is denser, and it can retards heat and oxygen and thus improve the flame retardant properties; trimer can reduce the release of flammable polyol gas, decompose into more carbon dioxide which is inert gas and it has certain flame retardant effect in the gaseous phase.

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