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High-speed dry-spray spinning method for preparing deformed section carbon fiber precursor fiber, pre-oxidized fiber or carbon fiber

A technology of precursor fibers and special-shaped cross-sections, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, and can solve problems such as undiscovered reports

Active Publication Date: 2019-03-29
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method of carbon fiber precursor fiber, pre-oxidized fiber or carbon fiber prepared by the present invention with the shape and cross-section characteristics similar to spur gears has not been found after searching.

Method used

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  • High-speed dry-spray spinning method for preparing deformed section carbon fiber precursor fiber, pre-oxidized fiber or carbon fiber
  • High-speed dry-spray spinning method for preparing deformed section carbon fiber precursor fiber, pre-oxidized fiber or carbon fiber
  • High-speed dry-spray spinning method for preparing deformed section carbon fiber precursor fiber, pre-oxidized fiber or carbon fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0073] Add acrylonitrile, methyl acrylate and itaconic acid (97:2:1 in molar ratio) to water (total monomer mass concentration: 25%) sequentially according to the ratio, and obtain a molecular weight of 80,000, A PAN-based polymer with a molecular weight distribution coefficient of 1.6 (wherein the comonomer molar content is 3%). The obtained PAN polymer was dissolved in a mixed solution of dimethyl sulfoxide solvent and dimethylacetamide (mass ratio: 15:85) to prepare a spinning solution with a solid content of 30 wt%. The viscosity of the spinning solution is 40Pa.s, the gel point is -25°C, and the gel range is within 8°C. The spinning solution is sequentially filtered using stainless steel metal fiber sintered felts with a precision of 10 μm and 0.2 μm, and then the spinning solution is transferred to a defoaming kettle for degassing, and then spinning. Spinning by dry-jet wet spinning method, the spinning solution temperature is 55°C, the dry spray section is -10°C air, t...

Embodiment 2

[0075]Add acrylonitrile and acrylic acid (99.8:0.02 in molar ratio) to n-heptane (total monomer mass concentration: 6%) in sequence according to the ratio, and obtain PAN with a molecular weight of 950,000 and a molecular weight distribution coefficient of 5.5 through polymerization. Polymer (with a molar comonomer content of 0.02%). The obtained PAN polymer was dissolved in dimethyl sulfoxide to prepare a spinning solution with a solid content of 5.1 wt%. The viscosity of the spinning solution is 110 Pa.s, the gel point is 14°C, and the gel interval is within 6°C. Sequentially filter the spinning solution with a non-woven felt with a precision of 3 μm and 0.5 μm, then transfer the spinning solution to a defoaming tank for degassing, and then spin. Spinning by dry-jet wet spinning method, the spinning solution temperature is 65°C, the dry spraying section is -5°C air, and the spinneret holes are circular spinneret holes with a diameter of 0.065mm. In the spinning process, tw...

Embodiment 3

[0077] Add acrylonitrile and methyl acrylate (94:6 in molar ratio) to the zinc chloride solution (total monomer mass concentration: 25%) in sequence according to the ratio, and obtain a molecular weight of 420,000 and a molecular weight distribution coefficient of 3.3 through polymerization. The PAN polymer (wherein the comonomer molar content is 6%). The obtained PAN polymer was dissolved in dimethylacetamide to prepare a spinning solution with a solid content of 10.5 wt%. The viscosity of the spinning solution is 110 Pa.s, the gel point is 9°C, and the gel interval is within 6°C. The spinning solution is sequentially filtered with stainless steel metal fiber sintered felts with a precision of 5 μm and 2 μm, and then the spinning solution is transferred to a defoaming kettle for degassing, and then spinning. Spinning by dry-jet wet-spinning method, the temperature of the spinning solution is 35°C, the dry spray section is air at -1°C, and the spinneret hole is a circular spi...

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Abstract

The invention discloses a high-speed dry-spray spinning method for preparing deformed section carbon fiber precursor fiber, pre-oxidized fiber or carbon fiber. An acrylonitrile polymer is dissolved byusing a solvent to obtain a uniform spinning solution, the spinning solution enters into a coagulating bath component of which the temperature is lower than the gelation temperature point of the spinning solution to form nascent fiber after passing through spinneret orifices to form a spinning trickle, and the working procedures of drafting, washing, drying and oil application aftertreatment arecarried out on the nascent fiber to obtain the carbon fiber precursor fiber. The carbon fiber precursor fiber is pre-oxidized and carbonized to obtain pre-oxidized fiber or carbon fiber. The method has the advantages of low cost and good fiber performance since fiber with similar straight toothed spur gear shape section characteristics is prepared in the condition of high-power drafting.

Description

technical field [0001] The invention relates to a chemical fiber product and a preparation method thereof, in particular to a method for preparing a special-shaped cross-section carbon fiber precursor fiber, pre-oxidized fiber or carbon fiber by high-speed dry jet spinning. Background technique [0002] Carbon fiber has been widely used in aerospace, defense industry, sporting goods, new automobile industry and new energy and other fields due to its high specific strength, high specific modulus, corrosion resistance and other excellent properties. At present, the most widely used carbon fiber is polyacrylonitrile (hereinafter sometimes referred to as PAN)-based carbon fiber. Its preparation method is to obtain PAN by copolymerizing acrylonitrile and certain monomers, and use the spinning solution containing PAN to pass wet spinning, dry spinning, etc. Spinning or dry spray wet method to obtain PAN primary fibers, and obtain carbon fiber precursor fibers (sometimes referred t...

Claims

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Application Information

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IPC IPC(8): D01F9/22
CPCD01F9/22
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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