The influence of some halogen-free flame retardants (ammonium polyphosphate or ammonium polyphosphate + melamine cyanurate) on fire behaviour of modified polyisocyanurate/polyurethane (PIR/PUR) foams, with a constant isocyanate index equal to 200, have been studied by means of a cone calorimeter. Foams were prepared from isocyanates modified with adipic acid, in order to obtain amide-modified isocyanurate foams that exhibit better thermal stability performance than polyurethane and lower friability than unmodified polyisocyanurate foams. The results obtained demonstrate that an increasing amount of filler causes a slight worsening of physical and mechanical properties, On the other hand, the cone calorimeter results show that the presence of melamine, which causes a rapid decrease of rate of heat release (RHR) and rate of weight loss, considerably improves the fire behaviour of the foams.

Influence of different flame retardants on fire behaviour of modified PIR/PUR polymers

MODESTI, MICHELE;LORENZETTI, ALESSANDRA;SIMIONI, FRANCESCO;
2001

Abstract

The influence of some halogen-free flame retardants (ammonium polyphosphate or ammonium polyphosphate + melamine cyanurate) on fire behaviour of modified polyisocyanurate/polyurethane (PIR/PUR) foams, with a constant isocyanate index equal to 200, have been studied by means of a cone calorimeter. Foams were prepared from isocyanates modified with adipic acid, in order to obtain amide-modified isocyanurate foams that exhibit better thermal stability performance than polyurethane and lower friability than unmodified polyisocyanurate foams. The results obtained demonstrate that an increasing amount of filler causes a slight worsening of physical and mechanical properties, On the other hand, the cone calorimeter results show that the presence of melamine, which causes a rapid decrease of rate of heat release (RHR) and rate of weight loss, considerably improves the fire behaviour of the foams.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2459117
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