In order to improve the flame retardant performance of silicone rubber foam,organically mod-ified montmorillonite and zinc borate were added as flame retardants to silicone rubber foam,and organ-ically modified montmorillonite/zinc borate/silicone rubber foam composites were prepared by room temperature vulcanization method,and the flame retardant properties of SRF composites were studied by limiting oxygen index,horizontal-vertical combustion test and smoke density test.The thermal stabil-ity and pyrolysis gas composition of the composites were studied by thermogravimetry-infrared analysis,and the thermodynamic analysis of thermal degradation of composites was carried out by non-isothermal method.The results show that the LOI of the composites reaches a maximum of 29.5％when 2wt％OMMT and 1wt％ZB are added,which is 11.3％higher than that of pure SRF.The maximum smoke density and smoke density grade are reduced by 32.9％and 34.1％respectively compared with pure SRF,which delays the thermal decomposition process of SRF composites and increass the amount of carbon residue.The activation energy of 2wt％OMMT/1 wt％ZB/SRF composites is significantly im-proved in the later stage of pyrolysis,indicating that the combination of OMMT and ZB can effectively improve the flame retardant and smoke suppression properties of SRF composites,and the flame retard-ant effect is mainly reflected in the later stage of pyrolysis.
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