Halogen-free intumescent flame retardants (IFR) are mainly composed of phosphorus and nitrogen,. IFR adding to Polypropylene (PP) may improve the material's flame retardancy performance, meanwhile suppress releasing of toxic-substance and gas. Nowdays, Synergistic flame-retarded effects during the acid source, the carbon source and the gas source of IFR system had been studied widely.
One intumescent flame retardants (IFR) containing various orbicular phosphates melamme salts was synthesized...