▎ 摘　　要

NOVELTY - Locally adjustable extrusion coated polyimide film comprises 400-600 pts. wt. polyimide, 50-80 pts. wt. trifluoroacetic acid anhydride, 10-15 pts. wt. triethylamine, and 6-15 pts. wt. graphene. USE - Locally adjustable extrusion coated polyimide film. ADVANTAGE - The locally adjustable extrusion coated polyimide film strengthens the anti-shrinkage of the film. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing locally adjustable extrusion coated polyimide film, which involves: (A) adding a diamine and a dianhydride to the reaction vessel at room temperature, adding m-cresol under protection of nitrogen, stirring, adding isoquinoline, raising temperature to 180-200 degrees C, reacting for 10-14 hours, after cooling, pouring the reaction solution into ethanol to form a polyimide resin; (B) mixing trifluoroacetic anhydride and triethylamine, placing graphene, pre-dispersing after high temperature treatment by high shear dispersing machine, and treating temperature is 300-500 degrees C to prepare a graphene mixture; (C) stirring the synthesized polyimide resin and the graphene mixture in a stirred reaction vessel, where stirring speed is 1200-1600 revolutions per minute, and stirring for 2-5 hours to prepare a polyimide resin film solution; (D) sending polyimide resin film liquid to an extrusion coater, and applying polyimide resin film liquid onto the steel strip through an extrusion die, and controlling gap control film electronically at the outlet of the die head; and (E) subjecting polyimide film to extrusion coating to form a film which is sent to an imidization furnace, imidizing, and finally subjecting to repeated hot and cold cycle treatment to obtain a final product.