A kind of micro-nano film carbon fiber and preparation method thereof

Abstract

A micro-nano film-like carbon fiber and a preparation method thereof, characterized in that: after polymerization, the prepared spinning stock solution is uniformly coated on a substrate to form a polymer coating with a micro-nano thickness; Then, it is thermally stabilized and carbonized by electric induction heating and auxiliary heating to form a carbon film, and the carbon film and the substrate form a composite micro-nano film-like carbon fiber; the substrate is removed to form a simple micro-nano film Carbon fiber: using the above-mentioned simple micro-nano film-like carbon fiber as a base material, repeating the above-mentioned process to prepare laminated micro-nano-film-like carbon fibers. 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 micro-nano film-like carbon fiber and a preparation method thereof. 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 cubic cen...

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

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