Abstract
Engineering polyamide 6(PA6)is preferred for its superior mechanical properties,yet the intrinsic flammability restricts its industrial applications.As one of the biomass phosphorus-containing chemicals,phytic acid(PA)is favorable for its high phosphorus content and aggregation ability,making it expected to enhance the fire retardancy of PA6.Herein,a melamine-phytate aggregate(MPA)is prepared by elec-trostatic interaction in aqueous solution,and applied as a synergist for aluminum diethylphosphinate(ADP)in PA6.The strong synergistic effect exists between ADP and MPA towards PA6,especially when their mass ratio is 3:1 and the total loading is 18 wt％.Compared to the neat PA6,this formula allows for remarkable decreases in peak heat release rate(PHRR),total heat release(THR),and maximum average heat release rate(MARHE)by～48％,～27％,and～30％,respectively,as well as a high synergistic efficiency of～43％in PHRR.This PA6 composite also presents a V-0 rating in the vertical burning(UL-94)test and a high limiting oxygen index(LO1)of 29.7％.This work offers an eco-friendly strategy for developing bio-based P/N fire-retardant aggregates for fabricating PA6 materials with high fire safety.
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