Comparative Study on Flame-retardant Effect of Two Compounds Containing Phosphaphenanthrene and Triazinetrione Groups on Rigid Polyurethane Foams

doi:10.19491/j.issn.1001-9278.2019.03.002

Abstract

Abstract: The flame-retardant rigid polyurethane foams (RPUFs) containing tris-(3-DOPO-2-hydroxy-propyl)-1,3,5-triazine-2,4,6-trione (TGD)/tris-(3-DOPO-propyl)-1,3,5-triazine-2,4,6-trione (TAD) and expansible graphite (EG) were prepared by a box foaming method. The effects of TGD and TAD on the flame-retardant behaviors of RPUFs were investigated by limiting oxygen index (LOI), cone calorimeter test, TGA-gas chromatography-mass spectrometer (TGA-GC-MS) and scanning electron microscopy. The results indicated that the introduction of both TAD and TGD into RPUFs could improve their LOI but reduced their values of total heat release, average effective heat of combustion and heat release rate. The influence of TGD on these values was more significant than that of TAD. On the other hand, the TGD/EG/RPUF system exhibited a higher LOI value and a larger char yield than the TAD/EG/RPUF one.

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