▎ 摘　　要

NOVELTY - A capacitor with mixed microcrystalline glass powder loaded graphene comprises polyimide high dielectric composite film comprising microcrystalline glass powder, polyacrylonitrile based carbon fiber powder, pyromellitic dianhydride, 4,4-bis diaminodiphenyl ether, N-vinyl pyrrolidone, N,N-dimethylacetamide, anhydrous ethanol, silane coupling agent, hydroxyethyl methacrylate, graphene, polyvinyl alcohol, water and nitric acid. USE - Capacitor with mixed microcrystalline glass powder loaded graphene. ADVANTAGE - The product is easy to disperse and stable, has good stability, increases dispersibility and utilization rate, reduces consumption, improves dielectric property, and maintains good mechanical property, processing property and heat stability. DETAILED DESCRIPTION - A capacitor with mixed microcrystalline glass powder loaded graphene comprises polyimide high dielectric composite film comprising 2-3 pts. wt. microcrystalline glass powder, 0.1-0.2 pt. wt. polyacrylonitrile based carbon fiber powder, 10-12 pts. wt. pyromellitic dianhydride, 8-10 pts. wt. 4,4,-bis diaminodiphenyl ether, 3-5 pts. wt. N-vinyl pyrrolidone, 20-25 pts. wt. N,N-dimethylacetamide, 3-5 pts. wt. anhydrous ethanol, 0.1-0.2 pt. wt. silane coupling agent, 0.4-0.5 pts. wt. hydroxyethyl methacrylate, 0.01-0.02 pt. wt. graphene, 0.1-0.2 pt. wt. polyvinyl alcohol, 4-5 pts. wt. water and 65% nitric acid. An INDEPENDENT CLAIM is included for preparation of capacitor with mixed microcrystalline glass powder loaded graphene comprising: (A) dissolving polyvinyl alcohol into water to prepare solution, getting graphene and microcrystalline glass powder, heating at 60-80 degrees C, constant temperature grinding for 30-40 minutes, ultrasonically dispersing for 20-30 minutes, pulping, drying to obtain powder, adding silane coupling agent, and mixing; (B) uniformly stirring to obtain surface modified microcrystalline glass powder loaded graphene composite powder, getting into anhydrous ethanol, ultrasonically dispersing for 20-30 minutes to material A, leaching polyacrylonitrile based carbon fiber powder into 65% nitric acid at 115 degrees C for 2-3 hours, water washing to neutral, and drying to material B; and (C) mixing 4,4,-bis diaminodiphenyl ether and N,N-dimethylacetamide, uniformly stirring, adding pyromellitic dianhydride, reacting for 10-12 hours to obtain polyamic acid solution, adding materials A and B, stirring, mixing for 8-10 hours, adding remaining materials, continuously stirring, coating on glass plate, and putting into blast oven box for imidization process at 100-200 degrees C for 1-2 hours.