A kind of method for preparing super carbon fiber

Abstract

The invention discloses a method for preparing super carbon fiber, which includes the step of preparing nano-precursor polymer, which specifically includes: dissolving acrylonitrile monomer raw material in a solvent, adding nano-graphite or nano-carbon black, and mixing uniformly by high-speed shearing, Then add an initiator or a catalyst to carry out a polymerization reaction in a solution state to generate a polyacrylonitrile solution that can be dissolved in a solvent, and a part of the structure of the polyacrylonitrile contains nano-graphite or nano-carbon black. The method of the present invention solves the matching problem of modulus and strength by improving the performance of polyacrylonitrile. At the same time, due to the introduction of chemical bonds in the axial direction of the fiber, the tensile performance of the carbon fiber in the axial direction is greatly improved, thereby greatly Amplitude increases the strength and modulus of the fiber.

Description

technical field [0001] The invention relates to the technical field of carbon fiber preparation, in particular to a method for preparing super carbon fiber by using nano-precursor polymerization technology. Background technique [0002] Carbon fiber is a high-strength, high-modulus fibrous polymer material with a carbon content of more than 90%. It has broad application prospects in aerospace, automotive and other fields. The most widely used raw material for carbon fiber is polyacrylonitrile. At present, the strength and modulus of the highest level of carbon fiber are less than 10% of the theoretical value. The so-called super carbon fiber refers to the carbon fiber whose strength and modulus reach or exceed 10% of the theoretical value of carbon fiber and take into account both strength and modulus. [0003] Since 1959, the key technologies in the global carbon fiber field have been monopolized by Japanese and American companies. Among them, the combined production capa...

AI Technical Summary

Problems solved by technology

One of the main reasons is the raw material, the lack of good raw silk, the raw silk is uneven and contains many defects

[0006] In addition, the shear resistance of carbon fibers prepared at home and abroad is very poor. The reason is that the graphite crystallites in the carbon fiber filaments are stacked along the fiber axis with (001) crystal planes, so their mechanical properties are along the axial direction. It is high in the radial direction, but low in the radial direction (vertical axis). This is also a problem that carbon fiber has not been able to solve.