Pre-spinning process of nitrile-based carbon fiber precursor

A treatment process, nitrile-based technology, applied in textiles and papermaking, etc., can solve the problems of resource waste, environmental pollution, non-spinnability, etc., and achieve the effects of recycling resources, avoiding environmental pollution, and avoiding waste

Active Publication Date: 2018-02-23
SUZHOU SHARTEL SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: a kind of nitrile-based carbon fiber precursor spinning pretreatment process, comprising the following steps, in S1, the nitrile-based carbon fiber precursor is continuously molded and crimped at normal temperature, and the nitrile-based carbon fiber precursor is directly The rod shape is continuously molded and crimped to change the friction of the fiber and increase the spinnability of the fiber. In S2, the negative pressure in the shaping furnace reaches 3000pa within 15 minutes, and the temperature can gradually reach 90°C within 5 minutes, so that the non-superior products can be gradually melted, and the internal structure changes, and then get modified. After the non-superior products are modified in S2, dry hot gas is injected into the shaping furnace instantaneously, so that the molten nitrile-based carbon fiber precursor liquid can be rapidly solidified to form modified nitrile-based carbon fiber precursors, which can then be shaped.

[0012] Am...

Embodiment 2

[0014] Embodiment 2: A pre-spinning process for nitrile-based carbon fiber precursors, including the following steps, S1: Continuously molding and crimping nitrile-based carbon fiber precursors at room temperature; S2: Making the nitrile-based carbon fiber precursors obtained in S1 Put the silk into the shaping furnace, and raise it to the shaping temperature in a vacuum state. The vacuuming time is 35min, and the negative pressure reached is 3500pa. During the vacuuming process, the temperature is raised, and the heating time is 25min, and the reached temperature is 120°C; S3: Under the conditions of S2, inject dry hot gas into the shaping furnace instantaneously to shape the obtained nitrile-based carbon fiber precursors.

Embodiment 3

[0015] Example 3: A pre-spinning process for nitrile-based carbon fiber precursors, including the following steps, S1: Continuously molding and crimping nitrile-based carbon fiber precursors at room temperature; S2: Making the nitrile-based carbon fiber precursors obtained in S1 Put the wire into the shaping furnace, and raise it to the shaping temperature in a vacuum state. The vacuuming time is 45min, and the negative pressure reached is 4000pa. During the vacuuming process, the temperature is raised, the heating time is 45min, and the reached temperature is 125°C; S3: Under the conditions of S2, inject dry hot gas into the shaping furnace instantaneously to shape the obtained nitrile-based carbon fiber precursors.

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D02J13/00
CPCD02J13/00
Inventor 张永春
Owner SUZHOU SHARTEL SCI CO LTD
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