▎ 摘　　要

NOVELTY - Preparing a three-dimensional resin-based carbon fiber composite material comprises e.g. (i) preparing the modified carbon fiber; (ii) preparing a three-dimensional carbon fiber multi-scale reinforcement; and (iii) soaking the three-dimensional carbon fiber multi-scale reinforcement in thermoplastic resin, developing the three-dimensional carbon fiber multi-scale reinforcement and thermoplastic resin developed under the micron multi-scale, forming a continuous microscopic network structure in the XYZ three-dimensional directions, extending the microscopic network structure mainly in the Z direction, constructing the carbon fiber skeleton, functional fillers and thermoplastic resins during the preparation process and solidifying. USE - The method is useful for preparing three-dimensional resin-based carbon fiber composite material is useful in aerospace, sports equipment, and wind power generation fields. ADVANTAGE - The method prepares three-dimensional resin-based carbon fiber composite material with excellent heat conductivity, electromagnetic shielding performance and mechanical property. DETAILED DESCRIPTION - Preparing a three-dimensional resin-based carbon fiber composite material comprises (i) dispersing the functional filler rare earth oxide, graphene powder and diamine monomer uniformly in the aprotic polar solvent according to the proportion and stirring fully and ultrasonically to obtain the dispersion a, adding 1,2,4-trimellitic anhydride acid chloride slowly dropwise into the dispersion liquid a to form the dispersion liquid b under the condition of ultrasonic stirring, soaking the continuous carbon fibers in the dispersion liquid b, and polymerizing the functional filler in situ at a low temperature to make the functional fillers on the surface of the carbon fibers evenly dispersed to prepare the modified carbon fiber; (ii) making the modified carbon fiber into a three-dimensional carbon fiber needle-punched felt by a three-dimensional needle-punching process, dipping the graphene oxide dispersion for many times, drying, carrying high-temperature carbonization, pre-constructing the carbon fiber skeleton and functional fillers in the modified carbon fiber in a micron-scale three-dimensional network and forming a continuous channel in the Z-axis direction to obtain a three-dimensional carbon fiber multi-scale reinforcement; and (iii) soaking the three-dimensional carbon fiber multi-scale reinforcement in thermoplastic resin, developing the three-dimensional carbon fiber multi-scale reinforcement and thermoplastic resin developed under the micron multi-scale, forming a continuous microscopic network structure in the XYZ three-dimensional directions, extending the microscopic network structure mainly in the Z direction, constructing the carbon fiber skeleton, functional fillers and thermoplastic resins during the preparation process and solidifying their three-dimensional thermal conductivity, conductive network path, increase the contact area between fillers, reducing the interfacial thermal resistance between fillers, and to obtain three-dimensional resin-based carbon fiber composite material with high thermal conductivity, strong electromagnetic shielding and mechanical properties. An INDEPENDENT CLAIM is also included for three-dimensional resin-based carbon fiber composite material, prepared as mentioned above, comprises modified carbon fiber made of functional filler rare earth oxide, graphene powder and diamine monomer, three-dimensional carbon fiber multi-scale reinforcement and thermoplastic resin matrix, and the three parts are in micron-scale multi-scale in the XYZ three-dimensional directions, a continuous microscopic network structure in which functional fillers are uniformly dispersed on the surface of carbon fibers and the microscopic network structure mainly extends in the Z direction in which the carbon fiber skeleton, functional fillers and thermoplastic resins are formed during the preparation process and finally solidify their three-dimensional thermal conductivity, conductive network path, increase the contact area between fillers, increase the interface bonding between the thermoplastic resin and the matrix, reduce the interface thermal resistance between the fillers, and the three-dimensional carbon fiber multi-scale reinforcement has good interfacial compatibility with the resin matrix, high thermal conductivity, strong electromagnetic shielding performance and mechanical properties.