▎ 摘　　要

NOVELTY - Preparing expandable graphite using graphene oxide or nano carbon powder, comprises e.g. milling graphene oxide powder, nano carbon powder, special graphite powder and graphite flake into a required particle size by grinding device and compounding; adding fractionated ingredients to the kneading pot for stirring, and the kneading is divided into dry mixing and wet mixing, then mixing perchloric acid and the purified kneaded material and stirring; then stirring, heating, adding deionized water, continuously stirring and reacting, filtering, then washing and drying the filtrate to obtain expanded graphite, adding fully kneaded raw materials to the mold for sealing, vacuuming, and then moving to isostatic pressing machine for compression molding, then set molding pressure, regulating, and then relieving the pressure and perfroming voltage regulation and then pressure releasing. USE - The method is useful for preparing expandable graphite using graphene oxide or nano carbon powder. ADVANTAGE - The expandable graphite: has improved pressure resistance, flexibility, plasticity and self-lubricity, specificity, adsorption, high and low temperature resistance, corrosion resistance, radiation resistance, seismic resistance, electrical conductivity, anti-aging and anti-twisting properties. DETAILED DESCRIPTION - Preparing expandable graphite using graphene oxide or nano carbon powder, comprises (i) taking the raw materials includes graphene oxide powder, nano carbon powder, special graphite powder, graphite flake, adhesive, medium temperature coal pitch, intercalation reagent, perchloric acid, potassium permanganate and deionized water, (ii) milling graphene oxide powder, nano carbon powder, special graphite powder and graphite flake into a required particle size by grinding device and compounding; the weight fraction ratio includes 25 pts. wt. graphene oxide powder, 20 pts. wt. nano carbon powder, 15 pts. wt. special graphite powder and 30 pts. wt. graphite flake, (iii) adding fractionated ingredients to the kneading pot for stirring, and the kneading is divided into dry mixing and wet mixing; where the ratio between perchloric acid and kneaded material is 1-10:1; the ratio between potassium permanganate and kneaded material is 1-10:1, (iv) mixing perchloric acid and the purified kneaded material and stirring according to the liquid-solid ratio; then press the liquid to solid ratio of potassium permanganate and mixture, then stirring at room temperature, heating to 30-50 degrees C and stirring the reaction for 1-3 hours, adding deionized water to raising the temperature in the reaction device to 50-100 degrees C, and then continuously stirring and reacting for 1-5 hours, filtering, then washing and drying the filtrate to obtain expanded graphite, where the detergent is deionized water, (v) adding fully kneaded raw materials to the mold for sealing, vacuuming to 10-50 KPa, and then moving to isostatic pressing machine for compression molding, the molding pressure is 100-150 MPa, and first increasing to a set molding pressure at a pressure increase rate of 10-12 MPa/minute, regulating for 5-10 minutes, and then relieving the pressure to 80-90 MPa with a pressure relief rate of 8-12 MPa/minute, perfroming voltage regulation of 5-10 minutes and then pressure releasing to 80-90 MPa at a pressure relief rate of 8-12 MPa/minute, and regulating the voltage for 5-10 minutes and relieving the pressure to 40-50 MPa at a pressure relief rate of 8-12 MPa/minute, and regulating the voltage for 2-5 minutes; finally, and the pressure releasing to the chamber pressure at a pressure relief rate of 8-12 MPa/minute, (vi) placing isostatically pressed the blank in a crucible and heating in a closed calciner to 1250 degrees C for carbonization, (vii) placing carbonized product in the Acheson graphitization furnace, and heating the calcined product to 2750-2900 degrees C by electric current under air-tight conditions, and converting the two-dimensional structure carbon product into a three-dimensional graphite grid structure, where the total power transmission time is 168 hours, (viii) introducing expandable graphite into the furnace through a feed port using a graphite expansion furnace, where the temperature of feed port is room temperature; and the expansion temperature of the furnace is 700-1000 degrees C; finally the discharge temperature is 50 degrees C, and then collecting expanded graphite material at the discharge port, and controlling the temperature at plus minus 5 degrees C, and (ix) processing final expanded graphite material by laser pulse to desired particle size to obtain expanded graphite material.