FIRE RETARDANCY OF INTUMESCENT FLAME RETARDANT POLYPROPYLENE WITH A CHARRING AGENT CONTAINING PENTAERYTHRITOL AND TRIAZINE

摘要

A macromolecular charring agent named as PEPADC was synthesized by using eyanuric chloride, 2, 6, 7-Trioxa-l-phosphabicyclo-[2.2.2]octane-4-methanol (PEPA) and diethylenetriamine and used to prepare intumescent flame retardant polypropylene (IFR-PP) with ammonium polyphosphate (APP).Effect of flame retardant compound on flame retardancy and fire behavior properties of IFR-PP system has been investigated.The results suggested that while the IFR loading is 30 wt％ and the weight ratio of APP to PEPADC is 4∶1, the IFR presents the most effective flame retardancy in PP systems and the LOI value is 35.5.Meanwhile, the IFR-PPs can pass UL-94 V-0 while the weight ratio of APP to PEPADC is between 1∶2 to 5∶1.Cone calorimeter results indicated that IFR-PPs exhibited much lower heat release rate (HRR) and total heat release (THR).Compared with neat PP, the specific extinction area (SEA) and total smoke production (TSP) of IFR-PP were also reduced.