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Preparation method of carbon fiber precursor fiber and application of carbon fiber precursor fiber

A technology of precursor fiber and carbon fiber, which is applied in the fields of fiber chemical characteristics, spinning solution preparation, wet spinning method, etc.

Active Publication Date: 2019-03-08
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the infinite combinations of raw material properties and process conditions, there is no complete information on how to achieve gel spinning in the spinning process under specific raw materials and spinning conditions. The specific gelation conditions need creative work to obtain. cannot be obtained by a finite number of experiments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Add acrylonitrile, methyl acrylate and itaconic acid (98:1:1 in molar ratio) to water (total monomer mass concentration: 30%) sequentially according to the ratio, and obtain a molecular weight of 70,000, A PAN-based polymer with a molecular weight distribution coefficient of 1.5 (wherein the comonomer molar content is 2%). The obtained PAN polymer was dissolved in a mixed solution of dimethyl sulfoxide solvent and dimethylacetamide (mass ratio: 10:90) to prepare a spinning solution with a solid content of 30 wt%. The viscosity of the spinning solution is 30Pa.s, the gel point is -30°C, and the gel range is within 10°C. The spinning solution is sequentially filtered using stainless steel metal fiber sintered felts with a precision of 10 μm and 0.5 μm, and then the spinning solution is transferred to a defoaming kettle for degassing, and then spinning. The spinneret hole is a circular spinneret hole with a diameter of 0.055 mm, and the spinneret draft ratio is 1.1. Afte...

Embodiment 2

[0071] Add acrylonitrile and methacrylic acid (99.9:0.01 in molar ratio) to n-heptane (total monomer mass concentration: 10%) in sequence according to the ratio, and obtain a compound with a molecular weight of 1 million and a molecular weight distribution coefficient of 6 through polymerization. PAN polymer (wherein the comonomer molar content is 0.01%). The obtained PAN polymer was dissolved in dimethylformamide to prepare a spinning solution with a solid content of 5 wt%. The viscosity of the spinning solution is 120 Pa.s, the gel point is 15°C, and the gel interval is within 5°C. Sequentially filter the spinning solution with a non-woven felt with a precision of 5 μm and 0.2 μm, then transfer the spinning solution to a defoaming tank for degassing, and then spin. The spinneret hole is a circular spinneret hole with a hole diameter of 0.2 mm, and the spinneret draft ratio is 3. After the spinning solution is ejected from the spinneret hole, it enters the first, second and...

Embodiment 3

[0073] Add acrylonitrile and methyl methacrylate (95:5 molar ratio) to the zinc chloride solution (total monomer mass concentration is 20%) in sequence according to the ratio, and obtain a molecular weight of 400,000 and a molecular weight distribution coefficient of 3.5 for PAN-based polymers (wherein the comonomer molar content is 5%). The obtained PAN polymer was dissolved in dimethylformamide to prepare a spinning solution with a solid content of 10 wt%. The viscosity of the spinning solution is 100 Pa.s, the gel point is 10°C, and the gel interval is within 5°C. The spinning solution is filtered using stainless steel metal fiber sintered felts with a precision of 2 μm and 0.3 μm in turn, and then the spinning solution is transferred to a defoaming kettle for degassing, and then spinning. The spinneret hole is a circular spinneret hole with a diameter of 2mm, and the draft ratio of the spinneret is 60. After the spinning liquid is ejected from the spinneret holes, it ent...

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PUM

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Abstract

The invention discloses a preparation method of carbon fiber precursor fiber and application of the carbon fiber precursor fiber. The carbon fiber precursor fiber is obtained by the steps as follows:dissolving an acrylonitrile polymer by utilizing a solvent to obtain a uniform spinning solution, allowing the spinning solution to pass through a spinneret hole to form a spinning flow which enters acoagulation bath component at the temperature lower than a gel temperature spot of the spinning solution and forms nascent fiber, and subjecting the nascent fiber to drafting, washing, drying and oiling post-treatment process. The carbon fiber precursor fiber is pre-oxidized and carbonized to obtain pre-oxidized fiber or carbon fiber. The carbon fiber precursor fiber has the advantages of low cost, good fiber performance and stable production under high-drafting conditions.

Description

technical field [0001] The invention relates to a chemical fiber product and a preparation method thereof, in particular to a carbon fiber precursor fiber and a preparation method thereof, and a method for using the carbon fiber precursor fiber to produce pre-oxidized fiber or carbon fiber. 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 as-spun fibers, and obtain carbon fiber precursor fibers (som...

Claims

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Application Information

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IPC IPC(8): D01F6/38D01F9/22D01D1/02D01D5/06
CPCD01D1/02D01D5/06D01F6/38D01F9/22
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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