Abstract: Owing to the mechanical properties decreased obviously when polymer were filled with high loading inorganic flame retardant, halogen-free flame retarded PE-LD/EPDM was prepared by dynamic vulcanizing method. Sulfur, DCP and phenolic resin were selected as vulcanizer for preparing dynamic vulcanizing PE-LD/EPDM materials, results showed that sulfur was the best vulcanizer and the proportion of EPDM/S/TMTD/DM/ZnO/AO was 40/1.6/2/1/0.5/0.5. Comparing with the material by simple blending, the mechanical and flame retardant properties of materials by dynamic vulcanizing improved remarkably. When PE-LD filled with 45% inorganic flame retardant, the material filling with 20% EPDM and preparing by dynamic vulcanizing had the best combination properties, tensile strength、elongation at break and impact strength was 9.59 Mpa、293.6 % and 36.5 KJ/m2 respectively, limited oxygen index was 29.1, the vertical combustion level reached UL94 V-0.

Key words: dynamic vulcanizing, low density polyethylene, ethylene propylene diene terppolymer, non-halogen flame retardant