Sepiolite was modified by silane coupling agent(KH550)to obtain modified sepiolite(K-SEP).Two bio-based flame retardant and smoke suppression systems AEGS and PEGS were prepared by compounding ammonium polyphosphate intumescent flame retardant system(AEG)and piperazine pyrophosphate intumescent flame retardant system(PEG).The flame retardant and smoke suppression properties of AEGS and PEGS on EPDM-based composites were studied.The experimental results show that the limiting oxygen index(LOI)of EPDM/AEGS3 and EPDM/PEGS3 composites with 3 phr K-SEP are 8.01％and 5.61％higher than that of the blank sample without sepiolite,and the TSP are reduced by 42.39％and 10.31％,respectively,indicating that sepiolite has important research value in the field of flame retardant and smoke suppression of polymer materials.
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