Carbon fiber precursor preparation method

Abstract

The invention belongs to the technical field of carbon fibers and discloses a carbon fiber precursor preparation method. The method includes steps: step one, adding phenol into straw powder, preheating, and liquefying to obtain a straw powder liquefied material by adopting concentrated hydrochloric acid as a catalyst; step two, mixing the straw powder liquefied material with a synthesizing agent,adding into a liquefied material spinning machine, and spinning to obtain initial fibers; step three, adding the initial fibers into a curing tank, adding formaldehyde and diluted hydrochloric acid, and performing curing treatment; step four, after curing treatment, subjecting the initial fibers to water-flow drying to obtain carbon fiber precursors. By drafting of washed fiber slivers in warm water, hardness reduction of carbon fibers due to overhigh steam temperature can be avoided, the stretch ratio of the carbon fibers is kept unchanged, and strength of the carbon fiber precursors is improved.

Description

technical field [0001] The invention relates to a method for preparing a precursor, in particular to a method for preparing a carbon fiber precursor, which belongs to the technical field of carbon fiber. Background technique [0002] Carbon fiber is a new type of fibrous carbon material with high strength, low density, corrosion resistance, aging resistance, high temperature resistance and easy conductivity. It is an indispensable new material for the development of cutting-edge technologies such as aerospace and military. The base material for replacement. With the development of science and technology and economy, the demand for carbon fiber in various fields is increasing day by day. At present, the production of carbon fiber in the world is mainly based on polyacrylonitrile. In recent years, wood carbon fiber has been well developed due to its wide source of production materials, low price, and excellent product performance. Moreover, traditional manufacturing technique...

AI Technical Summary

Problems solved by technology

In recent years, wood carbon fiber has been well developed due to its wide source of production materials, low price, and excellent product performance. Moreover, traditional manufacturing techniques can be borrowed in production. Therefore, wood carbon fiber, as a new type of carbon fiber, is gradually entering people's Its development prospects are very optimistic. The biomass liquefaction technology used in the preparation process uses biomass renewable materials as raw materials, which can replace degradable chemical resources of petroleum products. In today's society where resources are increasingly depleted, it has become a carbon fiber production A new type of technology for feeding materials. Traditional carbon fiber precursors are prepared separately from spinning solution and spinning. Although the efficiency is high, volatile and toxic substances pollute the environment. At the same time, different methods are used in the preparation process. The saturated steam environment affects the draft rate of carbon fiber precursors and reduces the strength of carbon fiber precursors