Method for preparing conductive composite material

Abstract

The invention relates to a method for preparing a conductive composite material and belongs to the field of preparation of materials. The method is characterized by comprising the following steps of placing expandable graphite in a high-temperature furnace and puffing to obtain EG; pouring the EG into a beaker and adding an sodium oleate / ethanol solution; placing the beaker on a magnetic stirrer, heating and stirring; after the stirring, carrying out ultrasonic vibration on the beaker in a water bath; and finally, carrying out suction filtration on GNP prepared by ultrasonic pulverizing and drying in a drying box; adding GNP into matrix resin comprising PP and POE; stirring in a high-speed mixer, and extruding and granulating by virtue of a twin-screw granulating machine group to complete the preparation of the conductive composite material. The content of graphite nanosheets is improved so that the prepared conductive composite material has good conductivity, better mechanical properties and electromagnetic shielding property. The method of the conductive material is simple in process and is easy to operate and the conductive material has larger market value.

Description

Technical field [0001] The present invention is a material preparation field, especially the preparation method of conductive composite materials. Background technique [0002] With the continuous progress of technology, material technology has developed rapidly, and high -molecular conductive composite materials can be used for the electrode, anticorrosive coating, electromagnetic shielding of fuel cells. In order to improve the conductive performance of the materials, metal particles, charcoal black, graphite powder are added to be addedWait for conductive fillers.The conductive performance of the polymer conductive composite material depends on the particle size of the conductive filler, the surface area of the comparison, and the orientation of the particles during processing.People expect to obtain high conductive performance with smaller fillers, that is, the material has a lower filtration threshold, which is conducive to the molding processing of the material.Therefore, s...

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Problems solved by technology

Although there are also some reports on carbon black and graphite filled polymers, because the fillers are at the micron level, the percolation threshold is generally between 15% and 20%, so a higher amount of addition is required to obtain better electrical conductivity.