▎ 摘　　要

NOVELTY - Preparing a graphene/magnesium silicate composite material, comprises (i) ultrasonically dispersing lignin in deionized water to obtain a graphene template, (ii) dissolving the resultant graphene template in absolute ethyl alcohol and aqueous solution, adding methyl orthosilicate, heating and reacting to obtain a lignin/silicon dioxide composite material, (iii) placing the resultant material into tubular furnace to calcining, grinding and stirring to obtain a mixed solution A, then adding magnesium chloride into absolute ethyl alcohol and slowly dropwise adding ammonium chloride solution to obtain a mixed solution B through mechanical stirring, and (iii) mixing the mixed solution A and mixed solution B, adding ammonia water, transferring the mixed solution A and mixed solution B into high-pressure reaction kettle, placing the mixture into a drying oven to perform hydrothermal reaction, cooling and filtering the obtained product and drying to obtain grey black powder. USE - The method is useful in preparing a graphene/magnesium silicate composite material. ADVANTAGE - The method: is simple; and the obtained product has excellent mechanical property and compatibility; and the foaming material has excellent roughness, friction coefficient, wear resistance, heat-resistance and weather resistance. DETAILED DESCRIPTION - Preparing a graphene/magnesium silicate composite material, comprises (i) ultrasonically dispersing lignin in deionized water to obtain a graphene template, (ii) dissolving the resultant graphene template in absolute ethyl alcohol and aqueous solution with alkaline pH, uniformly stirring for 30 minutes, adding methyl orthosilicate, heating to 40degrees Celsius, reacting for 6 hours, allowing to stand and drying in an oven at 80degrees Celsius overnight to obtain a lignin/silicon dioxide composite material, (iii) placing the lignin/silicon dioxide composite material prepared in the resultant step into a tubular furnace to calcining for 4 hours at 800degrees Celsius in nitrogen atmosphere, then grinding, adding deionized water and carrying out ultrasonic stirring to obtain a mixed solution A, then adding magnesium chloride into absolute ethyl alcohol and slowly dropwise adding an ammonium chloride solution to obtain a mixed solution B through mechanical stirring, and (iii) mixing the mixed solution A and mixed solution B, then dropwise adding ammonia water, transferring the mixed solution A and mixed solution B into a high-pressure reaction kettle, placing the mixture into a drying oven to perform hydrothermal reaction at 140degrees Celsius for 18-24 hours, cooling and filtering the obtained product and drying at 60degrees Celsius to obtain grey black powder. INDEPENDENT CLAIMS are included for: (1) graphene/magnesium silicate composite material produced by the above preparation method. (2) a rubber composite foaming material comprises 75-80 pts. wt. ethylene-vinyl acetate copolymer, 15-20 pts. wt. rubber, 1-10 pts. wt. graphene/magnesium silicate composite material, 2.5-3 pts. wt. foaming agent AC, 0.4 pts. wt. stearic acid, 0.5 pts. wt. zinc stearate, 0.7 pts. wt. zinc oxide and 0.9 pts. wt. dicumyl peroxide; and (3) preparing the rubber composite foaming material comprising, (i) uniformly mixing ethylene-vinyl acetate copolymer, rubber, a graphene/magnesium silicate composite material, stearic acid, zinc stearate, zinc oxide, dicumyl peroxide and a foaming agent AC, then placing the mixture into a preheated internal mixer, where the heating temperature is 110degrees Celsius and the rotating speed is 20 rotation/minute (rpm), (ii) quickly transferring the resultant mixture to an open mill, mixing for 10-20 minutes and pressing the materials into 3-5 microm slices, and (iii) taking the resultant slices according to the volume of the mold, placing the slices in a preheated flat vulcanizing machine mold cavity, carrying out secondary oil pressure molding for 300s at the temperature of 175degrees Celsius and 12 microPa after carrying out compression molding and foaming for 300s at the temperature of 175degrees Celsius and carrying out water cooling for 400s to obtain the product.