▎ 摘　　要

NOVELTY - Preparing polymer material-graphene nano composite material by continuous mixing in situ reduction comprises e.g. (1) adding graphene oxide powder to deionized water, and ultrasonically obtaining a specific concentration of graphene oxide suspension, and placing it in a liquid storage tank; (2) starting the extruder of the water-assisted melt-kneading extrusion equipment, adding the polymer material from the feeding port to the extruder, plasticizing and melting the polymer material to obtain a melt, and continuously extruding; (3) adjusting the extrusion processing parameters, including the feeding amount, the screw rotation speed and the temperature of each section of the barrel, so the melt pressure in the injection section of the extruder is increased to keep the injected water in a liquid state at a high temperature, by means of a metering pump, injecting the graphite oxide suspension into the melt of polymer material in the extruder from the water injection port. USE - The nanocomposite material is useful for manufacturing heat conductive material, conductive material, dielectric material, electromagnetic shielding material or antistatic material (claimed). ADVANTAGE - The method is simple in operation, non-toxic and does not perform any surface modification on graphene oxide (GO), and prepares nanocomposite material with good peeling and dispersing of reduced graphene oxide (RGO) and high degree of reduction. DETAILED DESCRIPTION - Preparing polymer material-graphene nano composite material by continuous mixing in situ reduction comprises (1) adding graphene oxide powder to deionized water, and ultrasonically obtaining a specific concentration of graphene oxide suspension, and placing it in a liquid storage tank; (2) starting the extruder of the water-assisted melt-kneading extrusion equipment, adding the polymer material from the feeding port to the extruder, plasticizing and melting the polymer material to obtain a melt, and continuously extruding; (3) adjusting the extrusion processing parameters, including the feeding amount, the screw rotation speed and the temperature of each section of the barrel, so the melt pressure in the injection section of the extruder is increased to keep the injected water in a liquid state at a high temperature, by means of a metering pump, injecting the graphite oxide suspension obtained in the step (1) into the melt of the polymer material in the extruder from the water injection port at a constant flow rate; (4) the mixing action of the extruder screw causes the injected droplets of graphene oxide to be continuously refined, and the water and the polymer material melt form a homogeneous system, which swells, plasticizes, vaporizes and expands in water, under the synergistic action, the graphene oxide is well dispersed and dispersing in the polymer material melt, and the interaction between the graphene oxide sheet layer and the polymer melt is increasing to promote the in situ thermal reduction of graphene oxide; (5) vaporizing the water in the exhaust section of the extruder to form water vapor and is pumped away from the exhaust port by a vacuum pump, extruding the graphene oxide at the exit of the machine head to be preferably stripping and dispersing, and thermally reducing in situ to obtain polymer material-graphene nano composite material.