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Acrylonitrile swollen yarn for carbon fiber, precursor fiber bundle, flame-proof fiber bundle, carbon fiber bundle, and production methods thereof

一种前驱体纤维、制造方法的技术，应用在纤维化学特征、纤维处理、湿纺法等方向，能够解决复杂工序、效果不充分、难以实用化等问题，达到高机械特性、机械性能优异的效果

Active Publication Date: 2012-05-16
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technique of suppressing oil infiltration and the technique of suppressing the formation of defect spots are difficult to put into practical use due to the need for very complicated processes.
Therefore, according to the studied technology, the effect of stably suppressing the infiltration of the oil agent into the surface layer is not sufficient, and the high strength of carbon fiber is also not at a sufficient level.

Method used

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  • Acrylonitrile swollen yarn for carbon fiber, precursor fiber bundle, flame-proof fiber bundle, carbon fiber bundle, and production methods thereof
  • Acrylonitrile swollen yarn for carbon fiber, precursor fiber bundle, flame-proof fiber bundle, carbon fiber bundle, and production methods thereof
  • Acrylonitrile swollen yarn for carbon fiber, precursor fiber bundle, flame-proof fiber bundle, carbon fiber bundle, and production methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative example 1～3

[0175] [Preparation of swollen silk and precursor fiber]

[0176] Acrylonitrile and methacrylic acid were polymerized by aqueous suspension polymerization to obtain an acrylonitrile-based copolymer composed of acrylonitrile unit / methacrylic acid unit=98 / 2% by mass. The obtained polymer was dissolved in dimethylformamide to prepare a spinning dope having a concentration of 23.5% by mass.

[0177] The spinning dope is temporarily spun out into the air from a spinneret equipped with discharge holes with a diameter of 0.13 mm and a number of 2000 holes, and then it is passed through a space of about 4 mm, and then discharged into a room temperature-controlled to about 15° C. It was coagulated in a coagulation solution containing an aqueous solution of 79.5% by mass of dimethylformamide, and the coagulated filaments were drawn. Next, after stretching by 1.1 to 1.3 times in air, it stretches by 1.1 to 2.9 times in a stretching tank filled with an aqueous solution containing 30% by ...

Embodiment 2～16 and comparative example 4～9

[0199] A swollen yarn and a precursor fiber bundle were obtained in the same manner as in Example 1, except that some conditions of the spinning process were changed. The fineness of the precursor fiber was 0.77 dtex, and the ratio of the major axis to the minor axis (major axis / short axis) of the fiber cross section of the single fiber was 1.005. Next, carbon fiber bundles were produced under the same firing conditions. The ratio of the long diameter to the short diameter (long diameter / short diameter) of the fiber cross-section of the single fiber of the carbon fiber bundle was 1.005, and the diameter was 4.9 μm.

[0200] Table 1 summarizes the conditions of the spinning process, and Table 2 summarizes the evaluation results of various fiber bundles.

Embodiment 17～20

[0202] Using the precursor fiber bundle obtained in Example 14, only the heat treatment conditions were changed in the second and third carbonization furnaces, and other conditions were the same as in Example 14 to produce a carbon fiber bundle. Table 3 shows the heat treatment conditions and properties of the carbon fiber bundles.

[0203] table 3

[0204] carbon fiber bundle

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Abstract

Disclosed is a carbon fiber bundle for obtaining a fiber-reinforced resin having high mechanical characteristics. Specifically disclosed is an acrylonitrile swollen yarn for carbon fibers, which is not treated with an oil agent and has pores in the surface of a single fiber within a range of 0.3-2 pores / [mu]m2 (inclusive), said pores having a width of 10 nm or more in the circumferential direction of the fiber. A precursor fiber obtained by treating the swollen yarn with a silicone oil agent has a silicon content of 1,700-5,000 ppm (inclusive), and a silicon content after 8-hour oil agent washing with methylethylketone using a Soxhlet extractor of 50-300 ppm (inclusive). The fiber is preferably composed of an acrylonitrile copolymer that contains 96.0-99.7% by mass (inclusive) of acrylonitrile and 0.3-4.0% by mass (inclusive) of an unsaturated hydrocarbon having one or more carboxyl groups or ester groups.

Description

technical field [0001] The present invention relates to carbon fiber bundles for obtaining high-quality, high-performance fiber-reinforced resins with excellent mechanical properties, especially for aircraft use and industrial use, and swelling filaments, precursor fiber bundles and refractory fiber bundles used in its manufacture. fiber bundles. Background technique [0002] For the purpose of improving the mechanical properties of resin-based molded products, it is common practice to compound fibers with resin as a reinforcing material. In particular, molding materials that combine carbon fibers with excellent specific strength and specific elasticity with high-performance resins can exhibit very excellent mechanical properties, so they are actively used as structural materials for aircraft and high-speed moving objects. Furthermore, there is a demand for higher strength and higher rigidity, and further, there is a demand for materials with excellent specific strength and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/18D01F9/22
CPCD01F9/22D01F6/38D01F6/18D01D5/247Y10T428/2975Y10T428/2978Y10T428/298D01D5/06D02J1/22
Inventor 桥本弘杉浦直树藤井泰行松村宏子奥屋孝浩大木勋畑昌宏若林巧己小龟朗由角谷和宣畑山明人
Owner MITSUBISHI CHEM CORP
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