Abstract: The halogen-free flame retardant phosphorus-containing epoxy resins have double flame retardant effect of gas phase and agglomeration phase for its phosphorus element. The materials do not produce continuable environmental contamination after decomposition. Therefore, they are widely researched as environment-friendly flame retardant materials. The thesis reviews that 9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO) epoxy resin system (including DOPO-containing epoxy resin, DOPO-based curing agent, DOPO-modified-polymer additive), phosphate-based epoxy resins(mainly including phosphate epoxy compounds, cyclic phosphate epoxy resin, phosphate curing agent), other curing system of phosphorus-containing, phosphazene epoxy resins and phosphorous-silicon epoxy resin. Their characteristics are introduced. It is summarized that the flame retardant properties and mechanism, thermal properties, the synergistic effect of phosphorus-nitrogen and fire retardant properties of phosphorus-silicon binary system.

Key words: phosphorus-containing epoxy resin, halogen-free flame retardant, flame-retardant mechanism