Starch-based carbon fiber and preparation method thereof

A starch-based, carbon fiber technology, applied in the direction of fiber chemical characteristics, conjugated artificial filaments, conjugated synthetic polymer artificial filaments, etc., can solve the restrictions on the popularization and application of starch-based carbon fibers, high porosity of starch-based carbon fibers, melting , flow, expansion and other problems, to achieve the effect of wide source of raw materials, simple preparation method, and reduce damage

Inactive Publication Date: 2017-12-22
DEYANG LIJIU YUNZHI KNOWLEDGE PROPERTY OPERATIONS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since ordinary starch is granular and has a certain degree of crystallinity, phenomena such as melting, flowing, and swelling may occur during the carbonization process, resulting in high porosity and stretching of starch-based carbon fibers prepared by existing formulas or preparation methods. The defects of low tensile strength and modulus cannot meet people's requirements on the mechanical properties of carbon fibers, which limits the popularization and application of starch-based carbon fibers

Method used

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  • Starch-based carbon fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Degrade and isomerize 100g of starch with 0.02g of glucose isomerase and 0.01g of amylase at 25°C for 4 hours to obtain product A;

[0031] (2) Add 1g of ferric chloride and 1g of copper chloride to product A, dehydrate at 105°C for 3 hours, separate and dry to obtain product B;

[0032] (3) Mix the product B with 8g of paraffin, 8g of phthalic acid, and 15g of polyacrylonitrile evenly, and carry out cross-linking polymerization with a twin-screw extruder; obtain product C; the twin-screw extrusion The maximum temperature of the working area in the machine is set to 330°C, and the minimum temperature is set to 280°C; the residence time of the material in the extruder is controlled at 90s;

[0033] (4) Melt spinning the product C at a temperature of 330°C to obtain starch-based carbon fiber precursors;

[0034] (5) The starch-based carbon fiber precursors were subjected to the first pre-oxidation at 200°C for 3 hours, and the second pre-oxidation at 370°C for 3 hour...

Embodiment 2

[0036] (1) Degrade and isomerize 100g of starch with 0.01g of glucose isomerase and 0.01g of amylase at 35°C for 5h to obtain product A;

[0037] (2) Add 1 g of ferrous chloride to product A, dehydrate at 85°C for 5 hours, separate and dry to obtain product B;

[0038] (3) Mix the product B with 5g of paraffin, 10g of phthalic acid, and 20g of polyacrylonitrile evenly, then carry out a cross-linking polymerization reaction at 320°C for 2 hours; obtain product C;

[0039] (4) Melt spinning the product C at a temperature of 350°C to obtain starch-based carbon fiber precursors;

[0040] (5) Carry out the first pre-oxidation of the starch-based carbon fiber precursor at a temperature of 220°C for 3 hours, and perform the second pre-oxidation at a temperature of 350°C for 5 hours, and then perform carbonization treatment at a temperature of 1250°C to obtain starch-based carbon fibers .

Embodiment 3

[0042](1) Degrade and isomerize 100g of starch with 0.03g of glucose isomerase and 0.02g of amylase at 35°C for 2 hours to obtain product A;

[0043] (2) Add 1g of ferric chloride, 1g of ferrous chloride, and 1g of hydrochloric acid to product A, dehydrate at 120°C for 1 hour, separate and dry to obtain product B;

[0044] (3) Mix the product B with 10g of paraffin, 5g of phthalic acid, and 10g of polyacrylonitrile evenly, and conduct a cross-linking polymerization reaction at a temperature of 340°C for 1 hour to obtain product C;

[0045] (4) Melt spinning the product C at a temperature of 310°C to obtain starch-based carbon fiber precursors;

[0046] (5) Carry out the first pre-oxidation of the starch-based carbon fiber precursors at a temperature of 180°C for 3 hours, and perform the second pre-oxidation at a temperature of 390°C for 2 hours, and then perform carbonization treatment at a temperature of 1050°C to obtain starch-based carbon fibers .

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Abstract

The invention discloses a starch-based carbon fiber and a preparation method thereof. The method comprises sequentially performing starch degradation, isomerization, dehydration, cross-linking polymerization, spinning, first pre-oxidation, second pre-oxidation and carbonization, not only Minimize the oxygen-containing groups in the starch molecules, and use the step-by-step pre-oxidation method to reduce the damage of the gas to the fiber structure and reduce the porosity in the fiber, so as to ensure that the prepared starch-based carbon fiber has tensile strength and good tensile modulus.

Description

technical field [0001] The invention relates to the field of carbon fiber materials, in particular to a starch-based carbon fiber and a preparation method thereof. Background technique [0002] Carbon fiber (CF for short) is a new fiber material with high strength and high modulus with a carbon content of more than 95%. It is a microcrystalline graphite material obtained by stacking organic fibers such as flake graphite microcrystals along the axial direction of the fiber, and undergoing carbonization and graphitization. Carbon fiber has many excellent properties, such as high axial strength and modulus, low density, high specific performance, no creep, ultra-high temperature resistance in non-oxidizing environment, good fatigue resistance, specific heat and electrical conductivity between non-metal and Between metals, the coefficient of thermal expansion is small and has anisotropy, good corrosion resistance, good X-ray permeability, good electrical and thermal conductivit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22D01F9/16D01F8/18D01F8/08C08J3/24C12P19/24C12P19/14C12P19/12C12P7/58C07D307/46C08L33/20C08L91/06
CPCD01F9/22C07D307/46C08J3/246C08J2333/20C08J2391/06C08J2433/20C08J2491/06C12P7/58C12P19/12C12P19/14C12P19/24D01F8/08D01F8/18D01F9/16
Inventor 李红梅
Owner DEYANG LIJIU YUNZHI KNOWLEDGE PROPERTY OPERATIONS CO LTD
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