▎ 摘　　要

NOVELTY - Preparing graphene modified high-strength high-modulus heterocyclic aramid fiber, comprises (i) evenly dispersing graphene oxide with carboxy groups or aminated graphene with amino groups in N,N'-dimethylacetamide/lithium chloride composite solvent to obtain graphene oxide dispersion or amino graphene dispersions, (ii) dissolving p-phenylenediamine and 2-(4-aminophenyl)-5-aminobenzimidazole in graphene oxide dispersion, adding terephthaloyl chloride, reacting to obtain amino-terminated heterocyclic aramid polymer solution containing graphene oxide, or dissolving terephthaloyl chloride in amino graphene dispersion in step (ii), adding two kinds of diamines into acid chloride, reacting to obtain carboxy-terminated heterocyclic aramid polymer solution containing aminated graphene, (iii) passing polymer solution containing graphene in step (ii) through spinning process to obtain heterocyclic aramid fiber containing graphene, and carrying out two-stage high-temperature heat treatment. USE - The graphene modified high-strength high-modulus heterocyclic aramid fiber is useful in many fields e.g. aviation, aerospace, and weaponry. ADVANTAGE - The method: improves the strength and modulus of the existing heterocyclic aramid fiber without reducing the thermal stability of the heterocyclic aramid fiber. DETAILED DESCRIPTION - Preparing graphene modified high-strength high-modulus heterocyclic aramid fiber, comprises (i) evenly dispersing graphene oxide with carboxy groups or aminated graphene with amino groups in N,N'-dimethylacetamide/lithium chloride composite solvent to obtain dispersion of graphene oxide or amino graphene dispersions, (ii) dissolving p-phenylenediamine and 2-(4-aminophenyl)-5-aminobenzimidazole in the graphene oxide dispersion in step (i), and then adding terephthaloyl chloride equivalent to 99.5-99.8% of diamine, and reacting under nitrogen protection to obtain amino-terminated heterocyclic aramid polymer solution containing graphene oxide with a dynamic viscosity of 30,000 to 200,000 centipoise at room temperature, or dissolving terephthaloyl chloride in the dispersion of aminographene in step (ii), then adding two kinds of diamines with an equivalent of 99.5-99.8% into the acid chloride, and reacting under nitrogen protection to obtain carboxy-terminated heterocyclic aramid polymer solution containing aminated graphene with a dynamic viscosity of 30,000-200,000 centipoise at room temperature, (iii) passing polymer solution containing graphene in step (ii) through a spinning process to obtain heterocyclic aramid fiber containing graphene, and carrying out two-stage high-temperature heat treatment to obtain graphene-modified heterocyclic aramid fiber with a tensile breaking strength of 30-36 cN/dtex and a modulus of 950-1200 cN/dtex.