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Fire-resistant fiber, method for producing same, and method for producing carbon fiber

A manufacturing method and technology of carbon fiber, which is applied in the field of refractory chemical fiber, can solve the problems of low density and G/D value of refractory chemical fiber bundles, reduced carbonization yield, low productivity, etc., and achieve the effect of high yield

Active Publication Date: 2021-03-19
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is, in the method described in JP 2009-138313, in order to prevent the thermal decomposition caused by the sudden heat generation of the polyacrylonitrile-based precursor fiber bundle at about 300° C., it is necessary to implement it at a temperature lower than 300° C. for a long time (for example, 70 minutes). ), so there is a problem of low productivity, and if the acrylamide-based polymer fiber bundle is subjected to flame-resistant treatment under the aforementioned conditions, the density and G / D value of the obtained flame-resistant fiber bundle become low, There is a problem that the carbonization yield decreases

Method used

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  • Fire-resistant fiber, method for producing same, and method for producing carbon fiber

Examples

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manufacture example 1

[0072] The AM / AN copolymer (AM / AN=80mol% / 20mol%) powder (p-1) obtained in Preparation Example 1 was dissolved in ion-exchanged water, and the obtained aqueous solution was used for dry spinning to produce an acrylamide-based polymer Fiber (f-1).

[0073]

[0074] 100 obtained acrylamide-based polymer fibers (f-1) were bundled to produce an acrylamide-based polymer fiber bundle, the mass of the fiber bundle was measured, and the fineness of the fiber bundle was calculated by the following formula:

[0075] Fiber bundle fineness [tex] = fiber bundle mass [g] / fiber length [m]×1000[m]

[0076] The fineness of the single fibers constituting the fiber bundle (the fineness of the acrylamide-based polymer fiber (f-1)) was determined to be 0.33 tex / fiber.

[0077]

[0078] The density of the acrylamide-based polymer fiber bundle was measured using a dry-type automatic density meter ("Akupick II1340" manufactured by Micromeritics Co., Ltd.), and the average fiber diameter of the si...

manufacture example 2

[0084]Dissolve the AM / AN copolymer (AM / AN=80mol% / 20mol%) powder (p-1) obtained in Preparation Example 1 in ion-exchanged water, and add 100 parts by mass of the AM / AN copolymer to the obtained aqueous solution 3 parts by mass of phosphoric acid to completely dissolve it. Dry spinning was performed using the obtained aqueous solution to produce acrylamide-based polymer fibers (f-2). The fineness, average fiber diameter, and density of the acrylamide-based polymer fiber (f-2) were obtained in the same manner as in Production Example 1, and the fineness was 0.38 tex / fiber, the average fiber diameter was 19 μm, and the density was 1.26 g / cm 3 .

manufacture example 3

[0086] An acrylamide-based polymer fiber (f-3) was produced in the same manner as in Production Example 2, except that 3 parts by mass of diammonium hydrogenphosphate was added instead of phosphoric acid with respect to 100 parts by mass of the AM / AN copolymer. The fineness, average fiber diameter, and density of the acrylamide-based polymer fiber (f-3) were obtained in the same manner as in Production Example 1, and the fineness was 0.46 tex / fiber, the average fiber diameter was 21 μm, and the density was 1.26 g / cm 3 .

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Abstract

A method for producing a fire-resistant fiber, which is characterized by comprising subjecting an acrylamide polymer fiber to a heat treatment at a fire-resistant treatment temperature in the range of200-500 DEG C in an oxidizing atmosphere while imparting a tension of 0.07-15 mN / tex to the acrylamide polymer fiber.

Description

technical field [0001] The present invention relates to refractory fiber, its manufacturing method and carbon fiber manufacturing method. Background technique [0002] As the manufacturing method of carbon fiber, the following method has been mainly used: the carbon fiber precursor obtained by polyacrylonitrile spinning is subjected to refractory treatment, and then carbonization treatment is applied (such as Japanese Patent Publication No. 37-4405, Japanese Patent Application No. Open 2016-40419, Special Open 2016-113726). Since the polyacrylonitrile used in this method is not easy to dissolve in cheap general-purpose solvents, it is necessary to use expensive solvents such as dimethyl sulfoxide and N,N-dimethylacetamide during polymerization and spinning. The problem of high manufacturing cost. [0003] In addition, Japanese Patent Application Laid-Open No. 2013-103992 describes an acrylonitrile system composed of 96 to 97.5 parts by mass of acrylonitrile units, 2.5 to 4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/21D01D10/02
CPCD01F9/21D01D10/02D01F6/26C04B14/386D01F9/225D10B2101/12
Inventor 森下卓也成田麻美子毛利诚菊泽良弘河合秀保重光望
Owner TOYOTA JIDOSHA KK
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