Abstract: In this study, aluminum salts of methylcyclohexyl phosphinate 单位 Al 单位 MHP)) with 4 particle sizes were used as flame retardants for epoxy resin 单位 EP). The effects of particle size on the flame retardancy, thermal property and adhesive strength to aluminum of Al单位 MHP)／EP composites have been investigated. The results showed that the reduction of particle size of Al 单位 MHP) could make an improvement in above properties of the EP composites. When the particle size of Al单位 MHP) reduced from 36.50 μm to 4.11 μm, the limited oxygen index单位 LOI) for 17 wt ％ of Al单位 MHP)／EP composite increased from 34％ to 39％, the residue char yield at 700 ℃ increased from 23 ％ to 31％ and the shear strength increased from 4.77 MPa to 8.44 MPa.

Key words: dialkylphosphinate salt, flame retardant, particle size, epoxy resin