▎ 摘　　要

NOVELTY - Manufacture of modified cooling phase change material involves (i) adding graphite flakes and sodium nitrate to 70% concentrated sulfuric acid, ultrasonically stirring, placing the suspension in the water bath temperature after the dispersion is complete and dripping solution of potassium permanganate until the solution is green, (ii) raising the temperature of the water bath, ultrasonically stirring, increasing the temperature of the water bath, slowly adding distilled water, and then transferring the resulting solution to refrigerator, placing the solution into a water bath again after the color of the mixture changes to coffee color, adding hydrogen peroxide, and stirring, (iii) pouring the solution into the centrifugal equipment, removing the suspension, and then adding diluted hydrochloric acid to the remaining centrifuge solution, and removing the suspension, (iv) forming geographer nanometers by forming remaining centrifuge solution and forming stable emulsion system. USE - Manufacture of modified cooling phase change material in the form of honeycomb coal cylinder, film and cooling paper used for cigarette. ADVANTAGE - The method enables effective manufacture of modified cooling phase change material having excellent cooling efficiency. DETAILED DESCRIPTION - Manufacture of modified cooling phase change material involves (i) adding 0.4-1.2 g graphite flakes and 0.3-0.8 g sodium nitrate to 15-35 ml 70% concentrated sulfuric acid, ultrasonically stirring for 1 hour, placing the suspension in the water bath temperature at 0-9 degrees C after the dispersion is complete and dripping 0.02 ml/l solution of potassium permanganate with a concentration until the solution is green, (ii) raising the temperature of the water bath to 30-45 degrees C, ultrasonically stirring for 45 minutes, increasing the temperature of the water bath to 75-90 degrees C, slowly adding 10-25 ml distilled water, and then transferring the resulting solution to refrigerator at -6 degrees C, placing the solution into a water bath with a temperature of 30-45 degrees C again after the color of the mixture changes to coffee color, adding 12-25 ml hydrogen peroxide, and stirring for 30 minutes, (iii) pouring the solution after the reaction is stabilized into the centrifugal equipment in which centrifuge at 3500-5000 rpm for 20 minutes, removing the suspension, and then adding 10 vol.% diluted hydrochloric acid to the remaining centrifuge solution which is centrifuge under the same conditions, slowly adding distilled water to continue centrifugation by using a high-speed centrifuge, under the conditions of 10000-15000 rpm, repeat washing 5 times, and removing the suspension, (iv) ultrasonically stripping the remaining centrifugal liquid to obtain a graphene oxide dispersion, drying at 50-80 degrees C for 1 hour to obtain graphene oxide, then adding 0.6-1.5 ml 75% hydrated hydrazine as a reducing agent to obtain graphene nanosheets, (v) mixing the obtained graphene nanosheets with the phase change material in a ratio of 1.0-1.8% of the overall mass fraction of the graphene nanosheets, dissolving the graphene nanosheets in ethanol solution and ultrasonically dispersing evenly, and dissolving the phase change material in ethanol solution and ultrasonically processing 60 minutes, then continuously stirring in a 75 degrees C water bath environment, condensing to recover ethanol, and drying the remaining sample in a 70 degrees C incubator to obtain graphene nanosheet/photo material composite particles, mixing melamine and carboxymethylcellulose, dissolving in ethanol solution, mixing thoroughly in a 40 degrees C water bath environment, then heating and melting myristyl alcohol and pentane, adding to obtained solution, adding sodium benzenesulfonate and polyvinyl alcohol as emulsifiers to the solution, using a homogenizer to homogenize at high speed for 20 minutes to obtain a stable emulsion system, adjusting the pH to 3-5 by adding citric acid, placing at a constant temperature for 2 hours, and then adding sodium hydroxide solution, adjusting the pH to 8-10, sieving, suction filtration, washing and drying to obtain phase change microcapsules.