Polyamide acid/polyacrylonitrile-based carbon fiber and preparation method thereof

A polyacrylonitrile-based carbon fiber and polyamic acid technology, which is applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve problems such as restricting the development of carbon fibers, and achieve the effects of saving preparation costs, large output and high carbon yield

Inactive Publication Date: 2015-06-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Carbon fiber has excellent properties, but since the raw materials for industrialized preparation of carbon fiber only have polyacrylonitrile, pitch and cellulose, the development of carbon fiber is restricted. The

Method used

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  • Polyamide acid/polyacrylonitrile-based carbon fiber and preparation method thereof
  • Polyamide acid/polyacrylonitrile-based carbon fiber and preparation method thereof
  • Polyamide acid/polyacrylonitrile-based carbon fiber and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A: Synthesize polyamic acid with 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA), 4,4'-diaminodiphenyl ether (ODA), p-phenylenediamine (PDA) as raw materials (PAA) solution, and then the configured PAN solution is mixed into the PAA solution according to 30% of the mass fraction of the PAA / PAN blend solution, and the primary blended fiber is obtained by wet spinning.

[0037] B: The primary blended fiber obtained in step A is placed in a temperature-programmed oven to apply a certain draft, and the temperature is continuously raised from 200°C to 280°C to obtain PI / preoxidized PAN fiber.

[0038] C: Wrap the PI / pre-oxidized PAN fiber on a graphite plate with a certain drawing force, then place the graphite plate between two carbon films and put it into a vacuum tube furnace, and feed high-purity N2 into the vacuum tube furnace , with a heating rate of 10°C / min, the temperature was raised to 1200°C, and then kept at 1200°C for 60 minutes, and the polyamic acid / polya...

Embodiment 2

[0041] A: Synthesize polyamic acid with 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA), 4,4'-diaminodiphenyl ether (ODA), p-phenylenediamine (PDA) as raw materials (PAA) solution, and then the configured PAN solution is mixed into the PAA solution according to 10% of the mass fraction of the PAA / PAN blend solution, and the primary blended fiber is obtained by wet spinning.

[0042] B: The primary blended fiber obtained in step A is placed in a temperature-programmed oven to apply a certain draft, and the temperature is continuously raised from 200°C to 280°C to obtain PI / preoxidized PAN fiber.

[0043] C: Wrap the PI / pre-oxidized PAN fiber on a graphite plate with a certain drawing force, then place the graphite plate between two carbon films and put it into a vacuum tube furnace, and feed high-purity N2 into the vacuum tube furnace , with a heating rate of 10°C / min, the temperature was raised to 1200°C, and then kept at 1200°C for 60 minutes, and the polyamic acid / polya...

Embodiment 3

[0045] A: Synthesize polyamic acid with 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA), 4,4'-diaminodiphenyl ether (ODA), p-phenylenediamine (PDA) as raw materials (PAA) solution, and then the configured PAN solution is mixed into the PAA solution at 20% of the mass fraction of the PAA / PAN blend solution, and the primary blended fiber is obtained by wet spinning.

[0046] B: The primary blended fiber obtained in step A is placed in a temperature-programmed oven to apply a certain draft, and the temperature is continuously raised from 200°C to 280°C to obtain PI / preoxidized PAN fiber.

[0047] C: Wrap the PI / pre-oxidized PAN fiber on a graphite plate with a certain drawing force, then place the graphite plate between two carbon films and put it into a vacuum tube furnace, and feed high-purity N2 into the vacuum tube furnace , with a heating rate of 10°C / min, the temperature was raised to 1200°C, and then kept at 1200°C for 60 minutes, and the polyamic acid / polyacrylonitri...

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Abstract

The invention provides a polyamide acid/polyacrylonitrile-based carbon fiber and a preparation method thereof, and belongs to the technical field of carbon fibers. The method comprises the following steps: firstly, preparing PAA/PAN primary blending fibers from a PAA/PAN blended solution by adopting a wet spinning method; heating the PAA/PAN fibers at an air atmosphere at 200-280 DEG C to cyclically transform PAA into polyimide (PI) and PAN to realize pre-oxidation so as to obtain PI/pre-oxidized PAN blended yarns; and treating at high temperature in the protection of inert gas to prepare the carbon fibers. The method is short in production cycle, the prepared carbon fibers have the advantages of high compactness, high coefficients of electric and thermal conductivities and small thermal expansion coefficient, and a novel source is provided to exploration of carbon fiber raw materials.

Description

technical field [0001] The invention relates to a method for preparing carbon fiber from a new precursor, in particular to a polyamic acid / polyacrylonitrile-based carbon fiber and a preparation method thereof, belonging to the technical field of carbon fiber. Background technique [0002] Carbon fiber is an excellent material with high specific strength, high specific modulus, high temperature resistance, corrosion resistance, good creep resistance, electrical conductivity, thermal conductivity and small thermal expansion coefficient. It is widely used in aerospace, automobiles, high-end sports equipment, etc. The high-end field, especially the demand for high-performance carbon fiber in the development of the aerospace industry, makes it an important strategic material and a leader in the field of new materials, and its research level has also become the representative of a country's new materials and aerospace industry development level One of the important symbols. Howev...

Claims

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Application Information

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IPC IPC(8): D01F9/22D01F9/24
Inventor 武德珍刘威威牛鸿庆张梦颖常晶菁何敏
Owner BEIJING UNIV OF CHEM TECH
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