▎ 摘　　要

NOVELTY - Preparation of flowable multielement synergistic nano-flame retardant involves mixing aminosilane with two phosphorus-containing organic substance and dissolving in organic solvent, stirring and removing organic solvent to obtain aminosilanes modified with two phosphorus structure which are first phosphorous structure-modified aminosilane and second phosphorous structure-modified aminosilane, mixing first phosphorous structure-modified aminosilane with vinylammonium bromide and removing organic solvent, ultrasonically dispersing nanoparticles in deionized water, adding obtained phosphorus structure-modified silane quaternary ammonium salt and second phosphorus structure-modified aminosilane, stirring, filtering and drying, and ultrasonically dispersing obtained nanoparticles co-grafted with phosphorus-modified quaternary ammonium salt and phosphorus-modified aminosilane in deionized water or organic solvent, reacting with polyether sulfate, extracting, drying and removing solvent. USE - Preparation of flowable multi-element synergistic nano-flame retardant used in preparation of modified thermoplastic polymers, modified thermosetting polymers, flame retardant fiber textiles and fiber-reinforced composite materials (all claimed). ADVANTAGE - The prepared nano-flame retardant can exhibit room temperature fluidity without solvent dispersion, improve melt fluidity of high-molecular polymers, such as polycarbonate, polyvinyl chloride and nylon and reduce processing temperature of the polymer, has monodispersity, can be highly uniformly dispersed in the polymer, and significantly improves mechanical properties of the polymer. The nano-flame retardant can simultaneously endow the polymer with excellent flame retardant efficiency, easy processability and high mechanical properties. DETAILED DESCRIPTION - Preparation of flowable multi-element synergistic nano-flame retardant involves mixing aminosilane with two phosphorus-containing organic substance and dissolving in organic solvent, where the mass ratio of aminosilane to phosphorus-containing organic substance is 1:(1-3), stirring at 0-100℃ for 1-5 hours and removing organic solvent to obtain aminosilanes modified with two phosphorus structure which are first phosphorous structure-modified aminosilane and second phosphorous structure-modified aminosilane, where phosphorus structure in two phosphorus-containing organic substances is different, mixing and reacting first phosphorous structure-modified aminosilane with vinylammonium bromide for 3-12 hours, removing organic solvent to prepare phosphorus structure-modified silane quaternary ammonium salt, where mass ratio of first phosphorus structure-modified aminosilane to vinylammonium bromide is (2-4):(2-5), ultrasonically dispersing nanoparticles in deionized water, adding phosphorus structure-modified silane quaternary ammonium salt and second phosphorus structure-modified aminosilane, where the mass ratio of nanoparticles, phosphorus structure-modified silane quaternary ammonium salt and second phosphorus structure-modified aminosilane is 1:(0.3-1):(1-2), stirring and reacting for 5-12 hours, filtering and drying to obtain nanoparticles co-grafted with phosphorus-modified quaternary ammonium salt and phosphorus-modified aminosilane, and ultrasonically dispersing the nanoparticles co-grafted with phosphorus-modified quaternary ammonium salt and phosphorus-modified aminosilane in deionized water or dissolving in organic solvent, adding preset amount of polyether sulfate and reacting for 12-24 hours at 30-100℃, extracting, washing with deionized water, drying and removing solvent.