Preparation,Flame Retardancy and Smoke Suppression Properties of Organically Modified Montmorillonite/Zinc Borate/Silicone Rubber Foam Composites
ABSRTACT:In order to improve the flame retardancy and smoke suppression properties of silicone rubber foam(SRF),long-chain quaternary ammonium salt(CTAB)organic modified montmorillonite(OMMT)/zinc borate(ZB)/SRF composites were prepared by room temperature vulcanization.The flame retardancy and smoke suppression properties of composites were studied by limiting oxygen index(LOI),horizontal-vertical combustion test(UL-94),conical calorimeter tests and thermogravimetric-differential thermal analysis.The results show that the flame retardant performance of SRF with the addition of 2％OMMT and 1％ZB is significantly improved,the LOI is 29.5％,the flame retardant grade reaches V-0 grade,the peak heat release rate(PHRR)and total heat release(THR)are 26.6％and 27.0％lower than those of pure SRF,and the peak smoke release rate(PSPR)and total smoke release(TSP)are 67.8％and 66.5％lower than those of pure SRF respectively.After adding OMMT and ZB,SRF shows good thermal stability and a denser carbon layer,and OMMT and ZB have certain gas-phase synergistic flame retardant effects.The research results provided a data basis and guiding significance for the research and development of flame retardant composites.
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