▎ 摘　　要

NOVELTY - Modified plastic comprises 5-20 pts. wt. 3000-mesh layer graphene powder. USE - Used as modified plastic. ADVANTAGE - The method: utilizes graphene as a filler, which can effectively improve its thermal conductivity; avoids excessive extrusion of additives during mixing; and prevents the layer number separation structure of a few layers of graphene powder from re-aggregating into multiple layers of graphene and resulting in decreases thermal conductivity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the modified plastic, comprising (i) adding master batch to the hopper of a barrel-type plastic color mixing machine, adding the dispersed oil containing polydimethylsiloxane as a component, and uniformly mixing until the surface of the plastic master batch is evenly coated, (ii) adding a few layers of graphene powder to mix it evenly on the surface of the plastic master batch, where the timing switch of the color mixer must be set to less than 2 minutes, so as not to mix and extrude the graphene powder layer structure for too long, (iii) setting the pre-hot water cold drawing pelletizing system, the temperature range of the extruder head and the barrel to about 180-300 degrees C, and adjusting the feed rate/screw speed (Q/N value) to 1-5 pph/revolutions per minute depending on the actual extrusion quality, (iv) adding the processed plastic master batch to the hopper of the feeder, heating and melting through a water-cooled bar pelletizing system, extruding under pressure, cooling the bar to form a pellet, and then outputting semi-finished pellets, (v) mixing 3-aminopropyltriethoxysilane, ethanol and softened water in a ratio of 2:7:1, and fully stirring for half an hour, (vi) placing the pellets in the step (iv) into a plastic high-speed mixer, spraying the coupling agent solution in the step (v) directly on the filler, stirring at 480 revolutions per minute (rpm) for 20-30 minutes, and drying at 120 degrees C for 2 hours, (vii) preheating the parts of the twin-screw extruder again, setting the temperature range of the head and barrel to about 180-300 degrees C, and adjusting the feed rate/screw speed (Q/N value) to 1-5 pph/rpm depending on the actual extrusion quality, and (viii) adding the dried and pretreated granules obtained from the step (vi) to the feeder hopper, heating and melting through a water-cooled bar pelletizing system, extruding under pressure, cooling the bar, shaping and cutting, and preparing into modified polycarbonate (PC) plastic master batch or modified polyamide (PA) plastic master batch.