Nitrile group type carbon fiber precursor spinning pretreatment process

Abstract

The invention discloses a nitrile group type carbon fiber precursor spinning pretreatment process. According to the technical scheme, the process includes the following steps that 1, nitrile group type carbon fiber precursors are subjected to continuous mold pressing curling forming at normal temperature; 2, the nitrile group type carbon fiber precursors obtained in the step 1 are added to a shaping furnace and instantly heated to the shaping temperature in a vacuum state, the vacuumizing time ranges from 5 min to 45 min, achieved negative pressure ranges from 3,000 pa to 5,000 pa, temperature rise time ranges from 5 min to 45 min, and the achieved temperature ranges from 90 DEG C to 150 DEG C; 3, under the condition of the step 2, dry hot gas is instantly injected into the shaping furnace, and the obtained nitrile group type carbon fiber precursors are shaped. The purposes that non-superior products generated in the existing carbon fiber precursor production process are reused, and waste and environmental pollution are reduced are achieved.

Description

technical field [0001] The invention relates to a fiber production process, in particular to a pre-spinning treatment process for nitrile-based carbon fiber precursors. Background technique [0002] Carbon fiber is a new type of high-strength, high-modulus fiber material with a carbon content of more than 95%. Among them, a nitrile-based carbon fiber is made of carbon fiber precursors (high-purity polyacrylonitrile) after high temperature in a carbonization furnace. made at high pressure. In the production process of carbon fiber precursors, the yield of carbon fibers can only reach about 80% to 90%. Carbon fiber precursors cannot meet the standard of high-strength carbon fiber filaments. Their temperature resistance is lower than 400 degrees, their oxidation resistance is poor, and they do not have spinnability. The carbon fiber precursors of these unqualified products cannot be used as materials due to their substandard performance. It can only be discarded as a non-high...

AI Technical Summary

Problems solved by technology

In the production process of carbon fiber precursors, the yield of carbon fibers can only reach about 80% to 90%. Carbon fiber precursors cannot meet the standard of high-strength carbon fiber filaments. Their temperature resistance is lower than 400 degrees, their oxidation resistance is poor, and they do not have spinnability. The carbon fiber precursors of these unqualified products cannot be used as materials due to their substandard performance. It can only be discarded as a non-superior product, which is not only a waste of resources, but also causes environmental pollution