Influence of Novel P-Br Flame Retardant on Flame Retardancy and Mechanical Properties of Epoxy Resin

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·s) to 0.77 kW/(m2·s),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 properties of the composite became inferior,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.