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Method for preparing pitch-based carbon fiber

A pitch-based carbon fiber and pitch technology, which is applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of unstable product performance and complex process, and achieve the effects of dense fiber, simple process and simple operation process.

Active Publication Date: 2011-04-27
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to address the shortcomings of the above scheme for preparing pitch-based carbon fibers, that is, complex processes and unstable product performance, and to provide a prepared pitch-based carbon fiber with excellent mechanical properties, simple production process, and low cost. The preparation method of pitch-based carbon fiber with the advantages of stable product performance and the like

Method used

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  • Method for preparing pitch-based carbon fiber
  • Method for preparing pitch-based carbon fiber
  • Method for preparing pitch-based carbon fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Anisotropic naphthalene pitch (sp: 280°C, mesophase content 100%) produced by Japan Mitsubishi Gas Chemical Co., Ltd. and isotropic coal tar pitch (sp: 280°C, mesophase content 100%) produced by Shanghai Dongdao Co., Ltd. 0%) at a ratio of 1:1 under the protection of nitrogen in a three-neck flask heated to 360° C., kept under mechanical stirring for 1 h, and cooled to room temperature to obtain spinning raw materials. Put 15g of raw material into the spinning barrel of the melt spinning machine, put it into the pitch carbon fiber forming device, raise the temperature of the fiber forming device containing the solid pitch raw material at 2°C / min to the melt spinning temperature of 330°C under protective gas, and put The molten strand is drawn and wound on a bobbin. Extrusion speed is 1.96×10 -7 m 3 / min, the winding speed is 300m / min, so that the raw silk can be wound evenly and continuously.

[0029] 2) Pretreat the prepared raw silk (oxidative cross-linking), pu...

Embodiment 2

[0032] 1) Take the two raw materials in Example 1 at a ratio of 5:1, raise the temperature to 360° C. in a three-necked flask under the protection of nitrogen, and keep it warm for 1 hour under mechanical stirring to obtain black spinning raw materials. In the spinning equipment described in embodiment one, the extrusion speed is controlled to be 3.14×10 -7 m 3 / min. , The winding speed is 200m / min, so that the raw silk can be wound evenly and continuously.

[0033]2) Carry out pretreatment (oxidative cross-linking) to the prepared raw silk, put the sample on the barbed wire sample loading platform, fold the sample loading platform into a "W" shape, put it into the temperature-programmed furnace, and let in air with a flow rate of 200ml / min, set the temperature at 2°C / min to 180°C, hold for 200min, heat at 1°C / min to 280°C, hold for 20min, take it out after cooling.

[0034] 3) Carry out carbonization treatment after cross-linking treatment: put the oxidized wire that has b...

Embodiment 3

[0036] 1) Take the two raw materials in Example 1 at a ratio of 9:1, raise the temperature to 360° C. in a three-necked flask under the protection of nitrogen, keep the temperature for 1 hour under mechanical stirring, and then cool to room temperature to obtain the black spinning raw material. Under the spinning equipment and spinning conditions described in Example 1, the raw silk is spun.

[0037] 2) Pretreatment (oxidative crosslinking) of the prepared precursors in the oxidative crosslinking device described in Example 1 and the heating program, and then taken out after cooling. Obtain oxidized silk.

[0038] 3) Carry out carbonization treatment after cross-linking treatment: put the oxidized wire that has been cross-linked treatment on the graphite paper sample loading platform, carbonize under the carbonization device and carbonization program described in Example 1, take it out after natural furnace cooling, that is Pitch-based carbon fibers can be produced. Such as ...

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Abstract

The invention discloses a method for preparing a pitch-based carbon fiber, relates to the carbon fiber and a preparation method thereof, and provides the method for preparing the pitch-based carbon fiber which has the advantages of high mechanical performance, simple production process, low cost, stable product performance and the like. The method comprises the following steps of: heating anisotropic pitch and isotropous pitch under the protection of inert gas; mechanically stirring in a molten state at a constant temperature; cooling to obtain a mixed pitch raw material; placing into a spinning barrel of a melt spinning machine; loading in a pitch carbon fiber forming device; heating under the protective gas to a melt spinning temperature to obtain a precursor fiber at a spinning nozzle;placing on a sample carrying table; placing in a high temperature furnace; setting a heating program; performing oxidation treatment and naturally cooling to obtain an oxidized fiber; and placing a cross-linked oxidized fiber on the sample carrying table, placing in the high temperature furnace, setting a heating program, introducing the inert gas for protection, performing carbonization treatment and then naturally cooling to obtain the pitch-based carbon fiber.

Description

technical field [0001] The invention relates to carbon fiber and a manufacturing method thereof, in particular to a pitch-based carbon fiber prepared from a mixed raw material of isotropic pitch and anisotropic pitch and a preparation method thereof. Background technique [0002] Because carbon fiber and its composite materials have a series of excellent properties such as high specific strength, high specific modulus, high temperature resistance, fatigue resistance, creep resistance, good electrical and thermal conductivity, and small thermal expansion coefficient, they can not only be used as structural materials to carry loads, but also It can function as a functional material. Therefore, in recent years, carbon fiber and its composite materials have developed rapidly, and are widely used in aircraft, spacecraft, automobiles, buildings, and high-temperature resistant materials such as brake pads and rockets. [0003] Considering various factors such as carbon yield, diff...

Claims

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Application Information

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IPC IPC(8): D01F9/145
Inventor 刘安华姚艳波涂惠彬舒欣夏文丽董炎明
Owner XIAMEN UNIV
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