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Carbon fiber bundles and flame-resistant chemical fiber bundles

A carbon fiber bundle, single fiber technology, applied in the direction of fiber chemical characteristics, fiber processing, carbon compounds, etc., can solve the problems of difficult to apply technology and low processability, and achieve the effect of reducing equipment operation rate.

Active Publication Date: 2017-05-31
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, complex nozzles with broad bean-shaped, elliptical, and circular holes are necessary, and in order to stably produce single fibers with widely different cross-sectional shapes, it is necessary to set conditions according to the cross-sectional shape with the lowest workability, etc. Difficult to apply to industrial processes

Method used

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  • Carbon fiber bundles and flame-resistant chemical fiber bundles
  • Carbon fiber bundles and flame-resistant chemical fiber bundles
  • Carbon fiber bundles and flame-resistant chemical fiber bundles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] Using dimethyl sulfoxide as the solvent and 2,2'-azobisisobutyronitrile as the initiator, the copolymer of 99.5 mol% of acrylonitrile and 0.5 mol% of itaconic acid was processed by solution polymerization. Polymerize to produce a polyacrylonitrile copolymer with a weight average molecular weight of 400,000 and an Mz / Mw of 2.1. Ammonia gas was blown into the obtained polyacrylonitrile-based polymer until the pH became 8.5, and the concentration of the polymer was adjusted to 19% by mass to obtain a spinning solution. The resulting spinning solution was used in the dry-wet spinning method (that is, at 40°C, the spinneret A was used to temporarily discharge the resulting spinning solution into the air, and after it passed through a space of about 5 mm, it was introduced to In a coagulation bath formed from a 79% dimethyl sulfoxide aqueous solution at 5°C, coagulation filaments were made. After washing the coagulated yarn with water by a conventional method, it was stretche...

Embodiment 2

[0120] The spinneret B was used to obtain a polyacrylonitrile-based precursor fiber bundle in the same manner as in Example 1, except that the space through which the spinning solution was discharged from the nozzle was about 4 mm. There is no particular problem with the passability of the silk making process. In the same manner as in Example 1, a carbon fiber bundle was obtained. The evaluation results are shown in Table 1. The SEM photograph of the cross section is as Image 6 Shown. In addition, the cross-sectional shape of the flame-resistant fiber bundle was also evaluated. The evaluation results are shown in Table 2.

Embodiment 3

[0122] Except that the single fiber fineness of the precursor fiber bundle was 0.7 dtex, the same procedure as in Example 1 was carried out to obtain a polyacrylonitrile-based precursor fiber bundle. There is no particular problem with the passability of the silk making process. The carbon fiber bundle was obtained in the same manner as in Example 1, except that the maximum temperature of the carbonization treatment was 1500°C and the tension was 3.5 mN / dtex. The evaluation results are shown in Table 1.

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Abstract

An object of the present invention is to provide a carbon fiber bundle including single fibers having a quasi-oval cross-sectional shape, which can effectively grasp the cause of fracture when a strength abnormality occurs. The carbon fiber bundle of the present invention contains more than 40% of single fibers whose cross-section perpendicular to the fiber direction is oval-like and simultaneously satisfies the following formulas (1) and (2), 1.03≤La / Lb≤1.20... (1), 1.05≤Ld / Lc≤1.25···(2), wherein, the line segment connecting the two points farthest apart in the periphery of the quasi-oval section of the single fiber is defined as the major axis, and the line segment connecting the major axis When the short axis is defined as a line segment perpendicular to the major axis at the midpoint and two points on the outer circumference, the length of the major axis is La and the length of the minor axis is Lb. In addition, when the major axis is quartered, the lengths of two line segments perpendicular to the major axis, respectively connecting a point other than the midpoint of the major axis and two points on the outer periphery, are Lc and Ld in descending order.

Description

Technical field [0001] The present invention relates to a carbon fiber bundle that facilitates analysis of the cause of fracture by including a single fiber having a specific cross-sectional shape as a main component, and a flame-resistant fiber bundle suitable for obtaining the carbon fiber bundle. Background technique [0002] Carbon fiber composite materials are widely used in sports and aircraft applications due to their excellent specific strength and specific elastic modulus. In recent years, attempts to apply them to automotive applications have also accelerated worldwide. Compared with existing materials centered on metals, the biggest advantage of carbon fiber composites is that they can achieve the same mechanical properties while reducing the weight of the applied parts. On the other hand, the price of carbon fiber composites reflects The price of carbon fiber as a raw material is still relatively expensive, so it cannot completely replace the existing materials. As t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/22D01D5/253D01F6/18
CPCD01D5/253D01F6/22D01F9/14C01B32/00D01F9/12
Inventor 奥田治己四方孝幸田中文彦
Owner TORAY IND INC
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