▎ 摘　　要

NOVELTY - An ultra-high-temperature resistant nano polyamide-imide film comprises 100-120 pts. wt. polyamide-imide and 2-5 pts. wt. modified graphene oxide material. The polyamide-imide comprises 20-35 pts. wt. polyamide-imide resin, 20-60 pts. wt. organic solvent, 0.1-10 pts. wt. diluent, 0.1-20 pts. wt. additive (A), 0.1-20 pts. wt. additive (B) and 0.1-20 pts. wt. additive (C). The modified graphene oxide material comprises 100 pts. wt. nano-sized modified graphene, 20-40 pts. wt. silane coupling agent and 2-3.5 pts. wt. cationic surfactant. USE - Ultra-high-temperature resistant nano polyamide-imide film (claimed). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation method of ultra-high-temperature resistant nano polyamide-imide film, which involves (1) preparing polyamide-imide solution by dissolving 20-35 pts. wt. polyamide-imide resin in 20-60 pts. wt. organic solvent, adding 0.1-10 pts. wt. diluent, 0.1-20 pts. wt. additive (A), 0.1-20 pts. wt. additive (B) and 0.1-20 pts. wt. additive (B), (2) subjecting 100 pts. wt. modified fused graphene material, 20-40 pts. wt. silane coupling agent and 2-3.5 pts. wt. cationic surfactant to dispersion treatment, (3) mixing 2-5 pts. wt. modified fumed graphene material with 100-120 pts. wt. polyamide-imide solution to obtain polyamide-imide solution system, (4) spreading the polyamide-imide solution system evenly on a clean substrate and evaporating the solvent to obtain a film and carrying out cross-linking reaction of the film by imidization reaction.