Expandable graphite as an intumescent flame retardant in polyisocyanurate-polyurethane foams

摘要

Flame retarded polyisocyanurate-polyurethane (FR PIR-PUR) foams have synthesized by the use of a new flame retar- dant, expandable graphite (EG foams), never used on industrial scale in polyurethane rigid foams, and a mixture of expandable graphite and triethylphosphate (EG-TEP foams). FR PIR-PUR foams, blown with n-pentane, have been prepared with a constant NCO index (250) in order to achieve greater thermal stability and better fire behaviour than polyurethane foams, without sig- Nificantly decreasing physical-mechanical properties. It was then investigated, as the presence of the flame retardants influences Both physical-mechanical properties an fire performance.