Study on the influence of supported nickel OMMT on fire-retardant properties of HIPS composites

The methods of ion exchanging,dipping and grinding were applied to load Ni element on OMMT,and PLS nano composites were prepared by melt intercalation method. The flame retardancy of the composites was assessed by the cone calorimeter and LOI,UL-94 methods. The results showed that the supported nickel OMMT made by ion exchanging reduced the heat release rate of the HIPS composites,indicating that supported nickel OMMT played a good fire-retardant role. Compared with OMMT,supported nickel OMMT system has a better fire-retardant effect on the HIPS composites. Through the study on the char residue morphology and the mass loss of the composites,it showed that the flame-retardant mechanism of supported nickel OMMT system is by the physical shielding of OMMT layers and promotion of char residue by catalyzing effect of nickel.