▎ 摘　　要

NOVELTY - A graphene-modified material is prepared by taking 162-210 pts. wt. banana stalk, crushing and sieving into 200-300 mesh, drying for 2.2-3.5 hours at 100-105 degrees C to water content of 1%, obtaining banana stalk powder, taking 1-2 pts. wt. graphene with magnetic field strength of 5000-6800 GS, ultrasonicating at power of 240-600 W at 40-55 degrees C at rate of 200-300 revolutions/minute (rpm) for 16-40 minutes, obtaining activated graphene energy powder, adding 0.6-1 pt. wt. fatty alcohol-polyoxyethylene ether ammonium sulfate, and stirring at 56-80 degrees C at rate of 60-150 rpm for 0.9-2 hours. USE - Method for preparing graphene-modified material (claimed). ADVANTAGE - The material has tensile strength and elongation at break of 52.98-57.86 MPa and 42.01%-44.42%, respectively. DETAILED DESCRIPTION - A graphene-modified material is prepared by taking 162-210 pts. wt. banana stalk, crushing and sieving into 200-300 mesh, drying for 2.2-3.5 hours at 100-105 degrees C to water content of 1%, obtaining banana stalk powder, taking 1-2 pts. wt. graphene with magnetic field strength of 5000-6800 GS, ultrasonicating at power of 240-600 W at 40-55 degrees C at rate of 200-300 revolutions/minute (rpm) for 16-40 minutes, obtaining activated graphene energy powder, adding 0.6-1 pt. wt. fatty alcohol-polyoxyethylene ether ammonium sulfate, stirring at 56-80 degrees C at rate of 60-150 rpm for 0.9-2 hours, obtaining graphene powder, adding banana stalk powder, 60-75 pts. wt. polylactic acid, 35-54 pts. wt. sodium tripolyphosphate and 4.1-8.3 pts. wt. complexing agent A, raising temperature to 160-224 degrees C, stirring for 2.5-4.2 hours at rate of 200-300 rpm, cooling, obtaining 3D printing primary material, cooling to - 115 to - 92 degrees C, 3.2-5.1 pts. wt. adding complexing agent B, and extruding at 168-205 degrees C at rate of 100-115 rpm.