▎ 摘　　要

NOVELTY - Preparing graphene functionalized polypropylene comprises (i) placing reaction bottle in an ice water bath, adding graphite powder and sodium nitrate in concentrated sulfuric acid, adding potassium perchlorate, potassium permanganate, stirring, adding deionized water, hydrogen peroxide, centrifuging and vacuum drying, (ii) taking dimethylformamide, adding calcium hydroxide, distilling, adding graphite oxide and anhydrous dimethylformamide, slowly adding MDL, stearic acid, centrifuging, drying, grinding and sieving, (iii) adding graphite oxide powder to dimethylformamide, adding paraphenylenediamine (PPD), refluxing, filtering using a polypropylene (PP) film, washing and drying, (iv) adding the obtained product into toluene organic solvent, adding methylacetylene-propadiene propane (MAPP), heating, adding initiator, stirring to precipitate the material and drying and (v) adding the dried material and PP into toluene organic solvent, evaporating, washing and drying. USE - The method is useful in preparing graphene functionalized polypropylene. ADVANTAGE - The method: improves the impact resistance of polypropylene; ensures the rigidity of double-wall corrugated pipe ring made of polypropylene; and prolongs the service life of double-wall corrugated pipe. DETAILED DESCRIPTION - Preparing graphene functionalized polypropylene comprises (i) placing 500 ml reaction bottle in an ice water bath, adding 5 g graphite powder and 5 g sodium nitrate in 200 ml concentrated sulfuric acid, mixing uniformly, adding 25 g potassium perchlorate under stirring, adding 15 g potassium permanganate, controlling the temperature at greater than or equal to 20 degrees C, stirring, removing the ice bath, transferring the reaction bottle to an electromagnetic stirrer, performing electromagnetic stirring continuously for 24 hours, slowly adding 200 ml deionized water, increasing the temperature to 98 degrees C, stirring for 20 minutes, adding hydrogen peroxide to reduce the residual oxidant to make the solution bright yellow, performing centrifugation at 10000 revolutions/minute to separate the graphite oxide suspension, washing using 5% hydrochloric acid solution and deionized water until the pH of the separation solution is 7 and vacuum drying the filter cake to obtain graphite oxide, (ii) taking 200 ml dimethylformamide into a round bottom flask, adding calcium hydroxide, allowing to react for 3-4 hours, distilling dimethylformamide under vacuum, adding 1 g graphite oxide and 200 ml anhydrous dimethylformamide into a dry three-necked flask for 30 minutes, uniformly dispersing graphite oxide in the solvent dimethylformamide, slowly adding 30 ml MDL using a constant pressure titration device under electromagnetic stirring, controlling the temperature at 80-100 degrees C, reacting for 2 hours, adding 6 g stearic acid into the three-necked flask, controlling the temperature at 80-100 degrees C and reacting for 2 hours, naturally cooling to room temperature, centrifuging using a centrifuge, discarding the supernatant, washing the lower layer solid using dimethylformamide, transferring the washed solid into a petri dish using a glass rod, drying in a vacuum drying box at 50 degrees C for 24 hours, taking out the product, grinding into fine particles and sieving using a 200-mesh sieve, (iii) adding 0.2 g graphite oxide powder to 250 ml dimethylformamide, ultrasonic dispersing for 120 minutes to obtain 0.8 mg/ml graphite oxide dispersion, adding 0.4 g paraphenylenediamine (PPD) into the graphite oxide dispersion, ultrasonically mixing for 10 minutes to obtain a mixed liquid, adding the mixed liquid into 500 ml three-necked flask, magnetically refluxing the mixed liquid in water bath at 90 degrees C for 24 hours, filtering using a polypropylene (PP) film, washing using ethanol and deionized water for 5 times and placing the product film in the vacuum drying box at 80 degrees C for 24 hours, (iv) adding the obtained product into 200 ml toluene organic solvent, ultrasonically dispersing for 60 minutes to obtain a dispersion, adding 5 g methylacetylene-propadiene propane (MAPP) into the dispersion, heating at 100-110 degrees C, adding initiator, allowing to react for 2-3 hours, stirring, adding the mixed solution into ethanol solution, stirring to precipitate the material and drying in the vacuum drying box at 80 degrees C for 24 hours and (v) adding the dried material and PP into 200 ml toluene organic solvent, ultrasonically stirring, controlling the temperature at 100 degrees C, dissolving the solvent completely, evaporating the solvent, washing the material using ethanol and drying the material by placing in the vacuum drying box at 80 degrees C for 24 hours.