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Spun fiber, polyacrylonitrile fiber, polyacrylonitrile-based carbon fiber and preparation method

A technology of polyacrylonitrile-based carbon fiber and polyacrylonitrile fiber, which is applied in the fiber field, can solve the problem of reducing the performance of polyacrylonitrile fiber and polyacrylonitrile-based carbon fiber, the difference in surface structure and core layer structure, and the uneven structure of polyacrylonitrile fiber. and other problems, to achieve the effect of reducing the amount of waste water and improving the uniformity of the structure

Active Publication Date: 2021-02-26
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the prior art, after the spun fine stream enters the coagulation bath, the morphology of the primary fiber is formed through phase separation; since the phase separation process starts from the surface layer of the fiber first, this makes the surface layer structure and the core layer structure of the fiber different. , which in turn leads to the existence of the so-called "skin-core structure", the structure of the primary fiber is uneven, the structure of the polyacrylonitrile fiber and polyacrylonitrile-based fiber is uneven, and the performance of polyacrylonitrile fiber and polyacrylonitrile-based carbon fiber is also reduced

Method used

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  • Spun fiber, polyacrylonitrile fiber, polyacrylonitrile-based carbon fiber and preparation method
  • Spun fiber, polyacrylonitrile fiber, polyacrylonitrile-based carbon fiber and preparation method
  • Spun fiber, polyacrylonitrile fiber, polyacrylonitrile-based carbon fiber and preparation method

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preparation example Construction

[0052] On the other hand, the embodiment of the present invention also provides the preparation method of the above-mentioned as-spun fiber, which comprises the following steps:

[0053] 1) Spinning: The polyacrylonitrile spinning stock solution is extruded from the spinneret hole to form a polyacrylonitrile spinning fine stream.

[0054] In this step, the polymer in the polyacrylonitrile spinning dope can be acrylonitrile homopolymer, or a copolymer with acrylonitrile as the main component, and acrylonitrile homopolymer or acrylonitrile as the main component. Copolymers obtain polymer-based blends.

[0055] In this step, the solvent in the polyacrylonitrile spinning dope (called polyacrylonitrile solvent); select dimethylsulfoxide, dimethylformamide, dimethylacetamide, lithium chloride / ionic liquid, sulfur Any one of sodium cyanate solution, zinc chloride solution or a mixture of the above.

[0056] In this step, the molecular weight and distribution of the polymer in the p...

Embodiment 1

[0082] This example is mainly used to prepare as-spun fibers, polyacrylonitrile fibers and polyacrylonitrile-based carbon fibers, and the specific preparation steps are as follows:

[0083] 1) Preparation of spinning stock solution: Polyacrylonitrile spinning stock solution is a polymer solution obtained by solution polymerization with dimethyl sulfoxide as solvent and acrylonitrile and itaconic acid as comonomers, with a weight average molecular weight of 130,000. Viscosity is 90Pa.s (here, the present embodiment and following embodiment are mainly illustrated with the polyacrylonitrile spinning solution that the viscosity-average molecular weight that adopts is 140,000, viscosity is 90Pa.s, but not limited to this, arbitrary A polyacrylonitrile spinning solution is suitable for the present invention).

[0084] 2) Preparation of primary fibers: The primary fibers are prepared by dry-jet wet spinning method (wherein, the draft ratio of the spinneret is 3.5); in this step. The...

Embodiment 2

[0090] This embodiment is mainly used to prepare as-spun fibers, polyacrylonitrile fibers and polyacrylonitrile-based carbon fibers; wherein, the difference between embodiment 2 and embodiment 1 is:

[0091] Primary fiber preparation: spinneret draw ratio is 2 times; the temperature of coagulation bath is 2 ℃; the composition of coagulation bath is ethanol and water with mass ratio of 1:9; Dwell time is 2 seconds;

[0092] Drafting treatment: the drafting ratio is 1.5 times.

[0093] Other steps are exactly the same as those in Example 1.

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Abstract

The invention relates to a primary fiber, polyacrylonitrile fiber, polyacrylonitrile-based carbon fiber and a preparation method. The technical solution mainly adopted is: the as-spun fibers are filaments in the form of fibers obtained after the polyacrylonitrile spinning fine stream is formed through a coagulation bath; wherein, the light transmittance of the as-spun fibers is not lower than 60%. The present invention mainly provides or prepares a nascent fiber with a light transmittance greater than 60%, and the structure of the nascent fiber under the light transmittance is uniform, so that the nascent fiber or the preparation method of the nascent fiber can be used to prepare a fiber with uniform structure and high performance. Excellent polyacrylonitrile fiber and polyacrylonitrile-based carbon fiber.

Description

technical field [0001] The invention relates to the field of fiber technology, in particular to a primary fiber, polyacrylonitrile fiber, polyacrylonitrile-based carbon fiber and a preparation method. Background technique [0002] Polyacrylonitrile-based carbon fibers have excellent properties such as high specific strength and high specific modulus, and composite materials using them as reinforcing fibers have been widely used in aerospace, new energy, etc. With the expansion of the application field of carbon fiber, the performance requirements of polyacrylonitrile-based carbon fiber are further improved. [0003] The structural characteristics of polyacrylonitrile fibers (ie, carbon fiber precursor fibers) determine the basic structure of polyacrylonitrile-based carbon fibers. The properties of polyacrylonitrile-based carbon fibers are greatly affected by the properties of polyacrylonitrile fibers. In particular, when the structure of the polyacrylonitrile fiber has a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/06D01D5/00D01D5/12D01D5/14D01D10/02D01F6/40D01F9/22
CPCD01D5/00D01D5/06D01D5/12D01D5/14D01D10/02D01F6/40D01F9/22
Inventor 刘耀东周普查吕春祥安锋于毓秀
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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