Preparation method of pitch for carbon fiber

Abstract

The present invention relates to a method for producing pitch for isotropic carbon fiber. More specifically, the present invention relates to a method for producing pitch, which is optically isotropic and has a high softening point, from a carbonaceous material including carbon-based coal tar pitch. According to an embodiment of the present invention, efficiency of polymerization reaction of the carbonaceous material can be increased by producing the pitch for the carbon fiber from a mixture of carbonaceous materials difference from each other; and a hydrogen content of the produced pitch can be increased. The pitch produced according to an embodiment of the present invention can have insoluble time significantly reduced by the increased hydrogen content. In addition, when hydrocarbon fiber is produced by using the pitch produced according to an embodiment of the present invention, a production amount per unit time is maximized and, at the same time, high-strength carbon fiber can be produced even though isotropic pitch is used.

Description

technical field [0001] The invention relates to a method for preparing pitch for carbon fibers, and more particularly, to a method for preparing pitch for carbon fibers by utilizing carbonaceous raw materials containing coal tar. Background technique [0002] As a representative example of carbon materials, carbon fiber is classified into polyacrylonitrile (PAN, polyacrylonitrile) type, cellulose type, pitch type, and phenolic resin type according to the raw material. The types are broadly divided into mesophase (Mesophase) pitch-based carbon fibers and isotropic (Isotropic) pitch-based carbon fibers. [0003] The aforementioned mesophase pitch-based carbon fibers are prepared using optically anisotropic mesophase pitch as a precursor, and the isotropic pitch-based carbon fibers are prepared using optically isotropic isotropic pitch as a precursor. As far as the mechanical properties of carbon fibers are concerned, mesophase pitch-based carbon fibers generally exhibit high ...

AI Technical Summary

Problems solved by technology

[0013] However, in order to hydrogenate carbonaceous raw materials, an expensive catalyst is required, and the process becomes complicated, so the production cost of pitch increases

In addition, in the case of additives such as nitro compounds, radical generators, and crosslinking agents, there are more expensive compounds than asphalt, and there is a new problem that it is difficult to apply commercially.