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Polyimide-based carbon fiber and preparation method thereof

A technology of polyimide-based carbon fiber and polyimide fiber, which is applied in the field of carbon fiber to achieve high carbon content, improve aromatization efficiency, and reduce adverse effects

Active Publication Date: 2013-12-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the research level of early PI fibers, the research on PI-based carbon fibers has been rarely reported.

Method used

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  • Polyimide-based carbon fiber and preparation method thereof
  • Polyimide-based carbon fiber and preparation method thereof
  • Polyimide-based carbon fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A: The polyamic acid solution obtained by PMDA / ODA polycondensation is used to prepare polyamic acid fiber by wet spinning process, and then the gradient thermal amidation process is used to imidize to prepare polyimide fiber;

[0035] B: Fix the polyimide fiber obtained in step A in a vacuum tube furnace, and apply a certain force along its axial direction, so that the fiber is always in a tensioned state during the heat treatment process;

[0036] C: The polyimide fiber fixed in the tube furnace was heated in N 2 Gradient temperature rise under protection, set the temperature rise program, heat from room temperature to 1100°C at a rate of 10°C / min and keep at this temperature for 60min, N 2 The flow rate of the method is 100ml / min, and after the end, it is naturally cooled to obtain polyimide-based carbon fibers.

Embodiment 2

[0038] A: The polyamic acid solution obtained by PMDA / ODA polycondensation is used to prepare polyamic acid fiber by wet spinning process, and then the gradient thermal amidation process is used to imidize to prepare polyimide fiber;

[0039] B: Fix the polyimide fiber obtained in step A in a vacuum tube furnace, and apply a certain force along its axial direction, so that the fiber is always in a tensioned state during the heat treatment process;

[0040] C: The polyimide fiber fixed in the tube furnace was heated in N 2 Gradient temperature rise under protection, set the temperature rise program, heat from room temperature to 1200°C at a rate of 10°C / min and keep at this temperature for 60min, N 2 The flow rate of the method is 100ml / min, and after the end, it is naturally cooled to obtain polyimide-based carbon fibers.

Embodiment 3

[0042] A: The polyamic acid solution obtained by PMDA / ODA polycondensation is used to prepare polyamic acid fiber by wet spinning process, and then the gradient thermal amidation process is used to imidize to prepare polyimide fiber;

[0043] B: Fix the polyimide fiber obtained in step A in a vacuum tube furnace, and apply a certain force along its axial direction, so that the fiber is always in a tensioned state during the heat treatment process;

[0044] C: The polyimide fiber fixed in the tube furnace was heated in N 2 Gradient temperature rise under protection, set the temperature rise program, heat from room temperature to 1400°C at a rate of 10°C / min and keep at this temperature for 60min, N 2 The flow rate of the method is 100ml / min, and after the end, it is naturally cooled to obtain polyimide-based carbon fibers.

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Abstract

The invention discloses a polyimide-based carbon fiber and a preparation method thereof, and belongs to the technical field of carbon fibers. The method comprises the following steps of: synthesizing a polyamide acid solution by adopting diamine and dianhydride monomers, and then preparing polyimide fiber; fixing the polyimide fiber in a vacuum tube furnace, and applying a force along the axial direction of the vacuum tube furnace so that the fiber is in a drawn state in a heat treatment process; performing gradient heating under the protection of N2 at the heating rate of 2 to 10 DEG C per minute for carbonization treatment till the final temperature is 1000 to 1600 DEG C, and preserving the heat for 10 to 60 minutes at the final temperature; and performing natural cooling, and thus obtaining the polyimide-based carbon fiber, wherein the polyamide acid solution is prepared by mixed polycondensation reaction of one diamine and one dianhydride, or prepared by copolycondensation of random one or more diamines and random more or one dianhydride, or prepared by blending random more mixed polycondensation or copolycondensation polyimides. The obtained polyimide-based carbon fiber has good compactness, few defects, high carbon content and conductivity.

Description

technical field [0001] The invention belongs to the technical field of carbon fiber, and relates to carbon fiber and a manufacturing method thereof, in particular to a polyimide-based carbon fiber prepared by using polyimide fiber as a precursor and a preparation method thereof. Background technique [0002] Carbon fiber is a new type of high-strength material, which is made of fibrous organic compounds (protofilaments) through pre-oxidation, carbonization and graphitization. It is a substance composed of incomplete graphite crystals arranged along the fiber axis, with a laminated structure of graphite crystals and a random layered structure of carbon microcrystals. The carbon content in the chemical composition of carbon fiber is more than 90%. It not only has the inherent characteristics of carbon materials, but also has the softness and processability of textile fibers. It is the main variety of special fibers. Carbon fiber has a series of excellent properties such as hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/24D01F6/78D01F11/08
Inventor 武德珍张梦颖宋景达齐胜利徐樑华曹维宇
Owner BEIJING UNIV OF CHEM TECH
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