Polyphosphazene covalent triazine flame retardant as well as preparation method and application thereof

Abstract

The invention relates to a polyphosphazene covalent triazine flame retardant as well as a preparation method and application thereof. Hexachlorocyclotriphosphazene is taken as one of raw materials, a triazine monomer with a multi-benzene ring structure is introduced into a polyphosphazene structure through nucleophilic substitution reaction, and a cross-linked micro-nano spherical structure is formed through polyfunctional group condensation reaction. According to the phosphazene covalent triazine flame retardant disclosed by the invention, through thermal decomposition of cyclotriphosphazene and a triazine ring and a synergistic effect of phosphorus and nitrogen, a dual flame-retardant effect is achieved in a gas phase and a solidification phase; meanwhile, cyclotriphosphazene and triazine ring have excellent chemical stability and thermal stability, so that the epoxy resin composite material has corresponding performance; the polyphosphazene has excellent thermodynamic compatibility, so that the material forms a uniform and continuous microstructure in the epoxy resin material; a large number of monomers containing rigid aromatic rings are introduced into triazine rings, and the monomers on the adjacent triazine rings are mutually crosslinked to form a net structure, so that the mechanical property of the epoxy resin composite material is enhanced.

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