▎ 摘　　要

NOVELTY - Natural crystalline flaky graphite powder is prepared into a dimethylformamide suspension of graphene oxide. The usage amount of graphite oxide is 7.5-15 mg/mL. Carboxy-activated graphene oxide is prepared using the suspension. A dimethyl sulfoxide solution of melamine is prepared using melamine and dimethyl sulfoxide. The carboxy-activated graphene oxide is heat-stirred with melamine solution. The mixture is filtered under reduced pressure, washed, and dried to obtain a melamine covalent-functionalized graphene-based hybrid nanomaterial. USE - Preparation of melamine covalent-functionalized graphene-based hybrid nanomaterial for use as filler in preparation of high-heat-resistant flame-retardant polymer nanocomposites. ADVANTAGE - The method enables simple, efficiency, economical and easy mass-production of melamine covalent-functionalized graphene-based hybrid nanomaterial having excellent thermal stability and dispersibility. DETAILED DESCRIPTION - Natural crystalline flaky graphite powder is prepared into a dimethylformamide suspension of graphene oxide. The usage amount of graphite oxide is 7.5-15 mg/mL. Carboxy-activated graphene oxide is prepared using the suspension. A dimethyl sulfoxide solution of melamine is prepared using melamine and dimethyl sulfoxide in a ratio of (50:1)-(5:1) mg/L. The carboxy-activated graphene oxide is heat-stirred with melamine solution in a mass ratio of (10:1)-(1:10). The mixture is filtered under reduced pressure, washed, and dried to obtain a melamine covalent-functionalized graphene-based hybrid nanomaterial.