Abstract: The influences of contents of flame retardant 1, 3, 5-tri(5, 5-dibromomethyl-1, 3, -dioxaphosphorinanyl-2-oxy)benzene (FR) on the flame retardancy and mechanical properties of epoxy resin (EP) were studied. Compared with neat EP, when the content of FR was 15 wt %, the limited oxygen index of EP/ FR system increased from 25.0 % to 29.3 %, the system could pass UL 94 V-0 rating, the fire growth index decreased from 3.63 kW/(m2·s1) to 0.77 kW/(m2·s1), the total heat release amount index reduced from 1.89 MJ/m2 to 1.34 MJ/m2, while the residue ratio at 600 ℃ rose to 29.02 % from 18.54 %. However, the mechanical property of the composite became inferior, it's the tensile strength decreased from 62.04 MPa to 39.81 MPa and the impact strength decreased from 13.46 kJ/m2 to 10.13 kJ/m2.

Key words: flame retardant, epoxy resin, flame retardancy, mechanical property, 1, 3, 5-tri(5, 5-dibromomethyl-1, 3, -dioxaphosphorinanyl-2-oxy)benzene