Abstract: This article reported the flame-retardant effect of melamine cyanurate (MCA)/antimony oxide (Sb2O3)/graphene on glass-fiber-reinforced polyamide 6 (PA6) composites. The introduction of MCA and Sb2O3 enhanced the compatibility of PA6 and glass fiber (GF) at a weight ratio of 70/30, and the mechanical strength, rigidity and flame-retardant properties of the composites were improved significantly with addition of 30 phr of MCA/Sb2O3 mixture. The addition of graphene almost did not affect the mechanical performance of the composites but enhanced their flame-retardant properties remarkably. The composites achieved a limiting oxygen index of 30.1 vol% and UL94 V-0 classification with addition of 0.3 phr of graphene, which promoted both carbonization and foaming action during the combustion of the composites.

Key words: graphene, flame-retardancy, polyamide 6, glass fiber