▎ 摘　　要

NOVELTY - Preparation of iron oxide-graphene oxide/natural rubber magnetic elastomer composite material involves dissolving iron chloride tetrahydrate and iron chloride hexahydrate in deionized water, stirring, dropwisely adding sodium hydroxide solution, cooling to room temperature, magnetically separating to obtain black precipitate, removing supernatant, carrying out ultrasonic dispersion with deionized water, magnetically separating, repeatedly washing supernatant until pH value is neutral, ultrasonically dispersing black magnetic particles in deionized water and mechanically stirring. USE - Method for preparing iron oxide-graphene oxide/natural rubber magnetic elastomer composite material (claimed). ADVANTAGE - The method is simple. The product prevents settlement and aggregation and has low curing temperature, improved magnetic particles, good structural stability, stable magnetic particles, improved mechanical properties and magnetic properties and excellent elasticity properties, heat resistance and solvent resistance. DETAILED DESCRIPTION - Preparation of iron oxide-graphene oxide/natural rubber magnetic elastomer composite material comprises: (A) dissolving 3.6 g iron chloride tetrahydrate and 6.1 g iron chloride hexahydrate in 90 mL deionized water, stirring at 50 degrees C with speed of 500 revolutions/minute, dropwisely adding 90 mL of 1.34 mol/L sodium hydroxide solution for 90 minutes, cooling to room temperature, magnetically separating to obtain black precipitate, removing supernatant, carrying out ultrasonic dispersion with deionized water, magnetically separating, repeatedly washing supernatant until pH value is neutral, ultrasonically dispersing black magnetic particles in deionized water at speed of 200 revolutions/minute and mechanically stirring for 10 minutes to obtain 0.02-0.167 g/mL stable iron oxide water-based magnetic liquid; (B) adding 2.0 g natural flake graphite and 2.0 g sodium nitrite to 46 mL concentrated sulfuric acid, mechanically stirring at speed of 600 revolutions/minute for 30 minutes, adding 6.0 g potassium permanganate, mechanically stirring at speed of 600 revolutions/minute for 60 minutes, transferring to 45 degrees C water bath, mechanically stirring at speed of 400 revolutions/minute for 4 hours, adding 80 mL deionized water, transferring to oil bath at 95 degrees C, mixing until the temperature reaches 95 degrees C, adding 200 mL deionized water and 16 mL of 30% hydrogen peroxide until solution changes from yellow to golden brown, sequentially adding 2 mol/L hydrochloric acid solution and deionized water, centrifuging, washing with ethanol until pH of the solution is neutral, drying the golden yellow precipitate in oven at 60 degrees C to obtain graphite oxide, adding graphite oxide to 20 mL deionized water and carrying out ultrasonic dispersion for 3-7 hours with power of 120 W to obtain 0.5-10 mg/ml graphite oxide suspension; (C) dissolving potassium hydroxide and peregal O in deionized water at 50 degrees C to obtain 20 wt.% potassium hydroxide solution and 20 wt.% aqueous solution of peregal O, adding 50 g sulfur, 20 mL of 10 wt.% casein solution, 1.25 mL of 11.5% ammonia, 28.75 mL deionized water and 75 mL glass sand to the vessel at room temperature, mechanically stirring at speed of 500 revolutions/minute for 12 hours, sieving the glass sand and first dispersant suspension to obtain 50 wt.% sulfur dispersion, adding 50 g zinc oxide, 20 mL of 10 wt.% casein solution, 3 g nitrogen fluoride, 5 mL of 20% ammonia, 30 mL deionized water and 75 mL glass sand into 500 mL enamel cup, mechanically stirring at speed of 500 revolutions/minute for 10 hours, sieving the second dispersant suspension to obtain 40 wt.% zinc oxide dispersion, adding 50 g of zinc diethyl dithiocarbamate accelerator, 40 mL of 10 wt.% casein solution, 1.15 g nitrogen fluoride, 28.85 mL deionized water and 75 mL glass sand into 500 mL enamel cup at room temperature, mechanically stirring at speed of 500 revolutions/minute for 12 hours and sieving the third dispersant suspension to obtain 50 wt.% zinc diethyl dithiocarbamate accelerator dispersion; and (D) adjusting pH value of water-soluble natural latex to 8-14 using alkaline solution, adding 20 wt.% aqueous solution of potassium hydroxide, 20 wt.% aqueous solution of peregal O where weight ratio of potassium hydroxide and latex is 1:500-1000 and weigh ratio of peregal O and latex is 1:500-1000, mixing iron oxide water-based magnetic liquid and graphite oxide suspension at 50 degrees C with speed of 150-250 revolutions/minute, adding into complex solution to obtain water-soluble natural rubber latex, dispersing sulfur, zinc oxide dispersion and zinc diethyl dithiocarbamate accelerator dispersion, curing for 60-150 minutes to obtain pre-vulcanization magnetic composite emulsion where weight ratio of sulfur and latex is 1:50-150, weight ratio of zinc diethyl dithiocarbamate accelerator and latex is 1:100-300 and weight ratio of zinc oxide and latex is 1:100-200, mechanically stirring at speed of 150-250 revolutions/minute, carrying out ultrasonic treatment for 30-180 minutes, pouring into a mold at 20-80 degrees C and drying for 10-36 hours to obtain iron oxide-graphene oxide/natural rubber magnetic elastomer composite material containing 84.9-96.4 wt.% natural rubber, 1-10 wt.% iron oxide and 0.5-3 wt.% graphite oxide.