EFFECT OF EXPANDABLE GRAPHITE ON DOUBLE-LAYERED MICROCAPSULES IN INTUMESCENT FLAME-RETARDANT NATURAL RUBBER COMPOSITES

摘要

Double-layered co-microencapsulated ammonium polyphosphate (APP) and expandable graphite (EG) (M(A&E)) were prepared by using melamine-formaldehyde resin and organic silicon in-situ polymerization.Due to the presence of synergists EG and organic silicone shell, the NR/M(A&E) composites had much better flame-retardant than other flame retardant NR composites.The cone calorimetry indicate the NR/M(A&E) composite has best flame retardant properties and the lowest fire risk.The occurrence of a synergistic effect between EG and intumescent flame-retardant (IFR) in the NR composites was proved.This investigation provided a promising formulation for flame-retardant NR composites.