Abstract: In this study， Co-LDH@ZIF-67 composite structure was constructed in situ using Co-LDH as a carrier， which effectively improves the defects of low catalytic activity and low specific surface area of Co-LDH. The flame retardancy tests showed that the Co-LDH@ZIF-67 modified epoxy （EP） composites had significant advantages in suppressing heat， smoke， and toxic gases compared to Co-LDH. Specifically， the LOI value of the composites increased from 24.5 % to 28.2 % when Co-LDH@ZIF-67 was added at 2 wt%. The peak heat release rate， the total heat release， and the total smoke release of the EP/Co-LDH@ZIF-67 composites were reduced by 35.1 %， 16.3 %， and 15.8 %， respectively， compared with pure EP. And it has more obvious flame retardant and smoke suppression ability compared with Co-LDH.

Key words: metal-organic frameworks, layered double hydroxides, epoxy resin, flame retardant