A graphene-reinforced preparation method of micro-nano film-like carbon fibers

Abstract

A graphene-reinforced preparation method for micro-nano film-like carbon fibers, characterized in that, using metal filaments or hollow metal thin-walled tubes as substrates, graphene is grown by CVD as a graphene-reinforced substrate, and the prepared spinning stock solution is passed through After polymerization, evenly coat the above-mentioned graphene-enhanced substrate to form a polymer coating with a thickness of micronano; spin into a silk film with a thickness of micronano; then thermally stabilize it by means of electric induction heating supplemented by auxiliary heating and carbonization to form a carbon film, and the carbon film and the substrate form a composite micro-nano film-shaped graphene-reinforced carbon fiber; the substrate is removed to form a simple micro-nano-film-shaped graphene-reinforced carbon fiber; the above-mentioned simple micro-nano-film-shaped carbon fiber is used as the substrate According to the above-mentioned process, the laminated micro-nano film-like graphene-reinforced carbon fiber can be prepared repeatedly. The micro-nano film-like carbon fiber structure and the preparation method thereof of the present invention can significantly improve the performance of the carbon fiber, improve the structure of the carbon fiber, increase the production efficiency and reduce the manufacturing cost.

Description

technical field [0001] The invention relates to carbon fiber technology, in particular to a graphene-reinforced preparation method of micro-nano film-like carbon fibers. Background technique [0002] Carbon fiber (CF for short) is a new type of fiber material with high strength and high modulus fibers with a carbon content of more than 95%. It is a microcrystalline graphite material stacked along the axial direction of the fiber by carbonizing and graphitizing organic fibers. [0003] Carbon fiber has two characteristics of strong tensile strength of carbon material and soft processability of fiber. It is a new material with excellent mechanical and electrical properties. At present, the tensile strength of mass-produced carbon fibers is about 2 to 7 GPa, and the tensile modulus is about 200 to 700 GPa. The density is about 1.5 to 2.0 grams per cubic centimeter. Generally, after graphitization treatment at a high temperature of 3000 ° C, the density can reach 2.0 grams per...

AI Technical Summary

Problems solved by technology

However, it is difficult for the traditional spinning technology to make the single filament diameter less than 2 μm according to the requirements of the carbon fiber precursor, and the too fine fiber brings great difficulties to processes such as mechanical stretching.

Without sufficient "fine denier", it is difficult to reduce the reduction of defect holes, so the improvement of carbon fiber strength has stagnated in recent years

[0010] 2. It is difficult to reduce the diameter of carbon fiber precursors to microns or below, and the "skin-core structure" of carbon fibers is unavoidable

[0012] 3. It is difficult to reduce the diameter of carbon fiber precursors to microns or below. In order to prevent the diffusion and "double diffusion" channels from increasing and expanding, the process is slow and complicated, resulting in long process and low production efficiency

[0013] 4. The diameter of carbon fiber is relatively large, so it is difficult to adopt advanced heating methods such as electric induction

The traditional heating method has low thermal efficiency, long process time and large loss of raw materials, resulting in high cost of carbon fiber

[0014] 5. If the substrate is coated with a micronano-thick polymer coating and spun into a micronano-thick silk film, thermal stabilization (pre-oxidation, non-melting and heat treatment), carbonization, graphitization, and formation of micro-nano films Shaped carbon fiber, although the "fine denier" of carbon fiber can be realized, but the metal on the base material will form carbides with the carbon fiber during the high temperature process of the process, causing defects and affecting the improvement of carbon fiber performance