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Preparation method of novel high-heat conduction carbon fibers

A high thermal conductivity, fiber technology, applied in the direction of chemical characteristics of fibers, chemical post-processing of rayon, textiles and papermaking, etc., can solve the limitations of large-scale preparation and application of high thermal conductivity mesophase pitch-based carbon fibers, and refining of precursor mesophase pitch. Difficulties, low mechanical properties of primary fibers, etc., to achieve the effect of easy continuous production, reduced adverse effects, and small effects on the overall structure of the fibers

Inactive Publication Date: 2016-06-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to refine its precursor mesophase pitch, the spinning equipment requires precision, and the mechanical properties of the primary fibers are very low, which makes the subsequent heat treatment process complicated, which limits the large-scale preparation and application of high thermal conductivity mesophase pitch-based carbon fibers.

Method used

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  • Preparation method of novel high-heat conduction carbon fibers
  • Preparation method of novel high-heat conduction carbon fibers
  • Preparation method of novel high-heat conduction carbon fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A: Polyamic acid solution is obtained by low temperature polycondensation of diamine and dianhydride, polyamic acid fiber is prepared by dry and wet spinning process, and then polyamic acid fiber is converted into polyimide fiber by thermal imide method. The imidization program setting: heating rate 5 o C / min, respectively at 100, 200, 300 o C each stay for 60min.

[0028] B: Fix the polyimide fiber obtained in step A in a vacuum tube furnace, and apply a drafting strength of 0.1 MPa along its axial direction, so that the fiber is in a state of tension and tension during the carbonization process. in high purity N 2 under the protection of 3 o C / min heating rate to 800 o C, and stay at this temperature for 60 min. Then, it is naturally cooled to obtain polyimide-based carbon fibers. The thermal conductivity of the material obtained at this time was 4.53 W·m -1 ·K -1 , the tensile strength is 745.94MPa.

Embodiment 2

[0030] Take the polyimide fiber that meets the requirements in Example 1, and other conditions are the same as in Example 1, except that the carbonization temperature is increased to 1200 o C, the thermal conductivity of the obtained material reaches 44.81 W m -1 ·K -1 , the tensile strength is 924.42MPa.

Embodiment 3

[0032] Take the polyimide fiber that meets the requirements in Example 1, other conditions are the same as in Example 1, and the carbonization temperature is increased to 1500 o C, the thermal conductivity of the obtained material is 55.97 W m -1 ·K -1 , the tensile strength is 533.05MPa.

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Abstract

The invention relates to a preparation method of novel high-heat conduction carbon fibers, and belongs to the technical field of preparation of functional carbon fibers. The method comprises the following steps: preparing polyimide fibers through a two-step technology; and charring the polyimide fibers under the following low-temperature constraint conditions: the drafting strength is 0.01-0.5MPa, inert atmosphere is adopted to protect, the heating rate is 1-10DEG C / min, the final charring temperature is 800-1500DEG C, and a final temperature is kept for 20-60min, in order to obtain polyimide-based carbon fibers; and graphitizing the obtained carbon fibers at a high temperature (of 2000-3200DEG C) under the protection of the inert atmosphere at a heating rate of 10-20DEG C / min in order to obtain polyimide-based graphite fibers. The graphite fibers with high crystallization degree, high graphitization degree and high heat conductivity can be obtained through the method.

Description

technical field [0001] The invention relates to a preparation method of carbon fibers using polyimide as a precursor, in particular to a preparation method of carbon fibers with high thermal conductivity. Background technique [0002] Carbon fiber has light specific gravity, high specific strength, high specific modulus, corrosion resistance, high temperature resistance, radiation resistance, thermal shock resistance and excellent conductivity. It is a typical high-performance fiber. It is used in marine engineering, new buildings, aerospace , sporting goods, new energy, marine development, microelectronics and other fields have been widely used. At present, the types of carbon fibers mainly include polyacrylonitrile (PAN)-based carbon fibers, pitch-based carbon fibers, and viscose-based carbon fibers. Among them, polyacrylonitrile-based and pitch-based carbon fibers are the most studied and the most industrialized. [0003] With the rapid development of aerospace technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/24D01F11/12D01F6/74C08G73/10
Inventor 马兆昆李昂宋怀河
Owner BEIJING UNIV OF CHEM TECH
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