| Summary: | Phosphated hydrotalcite (P-LDHs) was synthesized from steel slag and modified hydrotalcite (SDS-P-LDHs) was obtained by intercalation of P-LDHs with sodium dodecyl sulfate (SDS). P-LDHs and SDS-P-LDHs were blended with expanded graphite and ethylene vinyl acetate copolymer (EVA),to prepare EVA foam composites, respectively. The surface morphology and structure of P-LDHs and SDS-P-LDHs were characterized by XRD, XRF, FT-IR, SEM and TEM. Combined with limited oxygen index(LOI), UL-94, SEM, TG, tensile strength and elongation at break, the effects of P-LDHs and SDS-P-LDHs on the flame retardancy and mechanical properties of EVA foam composites were discussed. The results show that the addition of P-LDHs and SDS-P-LDHs significantly improves the flame retardant properties of EVA foam composites and can play a good role in charring formation. Compared with P-LDHs, SDS-P-LDHs have better compatibility with EVA matrix. When the addition amount of SDS-P-LDHs is 30%(mass fraction), the LOI reaches 27.5%, UL-94 reaches V-0 level, tensile strength and elongation at break are 2.27 MPa and 251%, respectively. The comprehensive properties of the system are optimal.
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