Carbon fiber, process for production of polyacrylonitrile-base precursor fiber for carbon fiber production, and process for production of carbon fiber

A carbon fiber manufacturing and manufacturing method technology, applied in the field of carbon fiber and its manufacturing, can solve the problems of carbon fiber tensile strength or compressive strength reduction, parent fiber heat resistance reduction, heat resistance bonding increase, etc., to achieve high tensile, Produces compressive strength, excellent quality effects

Active Publication Date: 2008-12-03
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to this proposal, although the effect of improving the tensile elastic modulus was confirmed, in order to increase the oxygen permeability, a large amount of copolymerization component exceeding 1.5% was used, so there was a problem that the heat resistance of the precursor fiber was lowered.
The decrease in heat resistance causes the dry heat treatment process in the silk-making process or the steam stretching process, and the bonding between single fibers in the burning process such as flame-proofing or carbonization increases, so that the workability or the tensile strength of the obtained carbon fiber or Reduced compressive strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0158] In the above-mentioned general examples, carbon fiber bundles were produced under the conditions described in the columns of Example 1 in Table 1 and Table 2. Strand tensile elastic modulus (GPa), conduction electron quantity (spins / g), specific gravity, average single fiber diameter (μm), crystal size (nm), and composite compressive strength (MPa) were measured for the obtained carbon fiber bundles. Each measurement result is shown in Table 2.

Embodiment 2

[0160] In the above-mentioned general examples, carbon fiber bundles were produced using the conditions described in the column of Example 2 in Table 1 and Table 2 . Strand tensile elastic modulus (GPa), conduction electron quantity (spins / g), specific gravity, average single fiber diameter (μm), crystal size (nm), and composite compressive strength (MPa) were measured for the obtained carbon fiber bundles. Each measurement result is shown in Table 2.

Embodiment 3

[0162] In the above-mentioned general examples, carbon fiber bundles were produced under the conditions described in the column of Example 3 in Table 1 and Table 2 . Strand tensile elastic modulus (GPa), conduction electron quantity (spins / g), specific gravity, average single fiber diameter (μm), crystal size (nm), and composite compressive strength (MPa) were measured for the obtained carbon fiber bundles. Each measurement result is shown in Table 2.

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PUM

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Abstract

A process for the production of polyacrylonitrile-base precursor fiber for carbon fiber production which comprises spinning a spinning dope containing a polyacrylonitrile-base polymer having a limiting viscosity of 2.0 to 10.0 in a concentration of 10 to 25% by weight by a wet spinning method or a dry-wet spinning method, subjecting the obtained fiber to drying and heat treatment, and then steam-stretching the resulting fiber, wherein the extrusion linear speed of the polyacrylonitrile-base polymer from spinnerets is 2 to 15m / min; and a carbon fiber which is produced by firing the polyacrylonitrile-base precursor fiber obtained by the process and which has a strand tensile modulus of 320 to 380GPa and a conduction electron density of 3.0*10<19> to 7.0*10<19>spins / g as determined by electron spin resonance.

Description

technical field [0001] The present invention relates to carbon fibers excellent in compressive strength and tensile modulus of elasticity, and a method for producing the same. The present invention also relates to a method for producing a polyacrylonitrile-based precursor fiber for producing carbon fibers for producing the carbon fibers. Background technique [0002] Carbon fibers are used in various applications due to their excellent mechanical and electrical properties. In recent years, in addition to current sports applications such as golf clubs and fishing rods and aircraft applications, so-called general industrial applications such as automobile parts, compressed natural gas (CNG) tanks, earthquake-resistant reinforcement parts for buildings, and ship parts have begun to be used. Correspondingly, the level of required mechanical properties is also increasing. For example, in aircraft applications, most of the structural components are being replaced by carbon fiber...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22D01F6/18B29C48/04B29C48/05B29C48/08
CPCD01F9/22D01F9/225Y10T428/2918Y10T428/2973Y10T428/2913Y10T428/2976D01F6/18B29C48/05B29C48/04B29C48/08B29C48/914B29C48/919
Inventor 伊势昌史中山功远藤真
Owner TORAY IND INC
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