▎ 摘　　要

NOVELTY - Preparing shielding material involves preparing surface cross-linked modified graphene oxide by adding 20-30 pts. wt. oxide graphene in 250-320 pts. wt. anhydrous ethanol, adding hydrochlorice acid to adjusting pH of dispersion to 3-4, slowly adding 200-350 pts. wt. ethanol solution, 1-5 wt.% silane coupling agent, adding product into dispersion liquid, heating at 50-60 degrees C for 15-20 hours, centrifuging, separating solid with anhydrous ethanol and deionized water, vacuum drying to obtain surface cross-linked modified graphene. USE - Method for preparing shielding material used for cable based on micro-capsule technology (claimed). ADVANTAGE - The method enables to prepare shielding material which has reduces resistance rate through surface functionalization of graphene, realizes dispersibility and coating performance, and has reduces resistivity. DETAILED DESCRIPTION - Preparing shielding material involves preparing surface cross-linked modified graphene oxide by adding 20-30 pts. wt. oxide graphene in 250-320 pts. wt. anhydrous ethanol, adding hydrochlorice acid to adjusting pH of dispersion to 3-4, slowly adding 200-350 pts. wt. ethanol solution, 1-5 wt.% silane coupling agent, adding product into dispersion liquid, heating at 50-60 degrees C for 15-20 hours, centrifuging, separating solid with anhydrous ethanol and deionized water, vacuum drying to obtain surface cross-linked modified graphene. The surface functionalized graphene is prepared by dispersing 15-25 pts. wt. surface-crosslinked modified graphene into 220-350 pts. wt. absolute ethanol, adding 50-80 pts. wt. hydrazine hydrate to raising temperature to 55-65 degrees C for 15-20 hours, centrifuging, separating washing with anhydrous ethanol and deionized water, and vacuum drying to obtain surface functionalized graphene. The core material is prepared by mixing 25-45 pts. wt. TDI (toluene-2,4-diisocyanate), 15-25 pts. wt. polyether, 5-12 pts. wt. DAPA (2,2-dihydroxypropionic acid), 2-8 pts. wt. surface functionalized graphene, raising temperature to 75-80 degrees C, adding 2-3 pts. wt. organotin catalyst, reacting for 2-4 hours, adding 3-6 pts. wt. chain extender, and reacting for 2-4 hours to obtain core. The wall material is prepared by mixing 30-45 pts. wt. chitosan and 25-30 pts. wt. silica airgel, mixture is heating at 75-85 degrees C, and uniformly stirring. The microcapsules is prepared by adding 10-15 pts. wt. core liquid to 30-45 pts. wt. wall material, raising tempertaure to 75-85 degrees C, mixture is stirreing while dripping to 60 degrees C for 2-4 hours, naturallt cooling, adding petroleum ether, washing, filtering out solid, and vacuum drying to obtain microcapsules. The cable shielding material is prepared by dispersing 20-25 pts. wt. microcapsules in 10-12 pts. wt. ethyl acetate to obtain microcapsule solution, dissolving 30-40 pts. wt. polymer in acetic acid, and 18-24 pts. wt. ethyl ester parts to obtain polymer solution. The microcapsule solution is mixed with polymer solution, and extruded by extruder to obtain final product.