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Carbon fiber surface complexing modification method

A carbon fiber and modification technology, applied in the field of complex modification of carbon fiber surface, can solve the problems of decreased mechanical properties of carbon fiber, not conforming to the concept of green chemistry, large power consumption, etc. The effect of continuous and improved interface strength

Pending Publication Date: 2021-12-31
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, plasma treatment has high requirements on equipment, and it is difficult to control the concentration factors in the treatment process, which is only suitable for laboratory research; the oxidation time of liquid phase oxidation treatment is difficult to control, and if the time is too long, the mechanical properties of carbon fibers will decrease; The consumption of electric energy is very large, and the electrolyte is difficult to handle, which pollutes the environment; irradiation treatment requires high equipment and high energy consumption, which does not conform to the concept of green chemistry

Method used

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  • Carbon fiber surface complexing modification method
  • Carbon fiber surface complexing modification method
  • Carbon fiber surface complexing modification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Immerse 0.625g of small tow polyacrylonitrile-based carbon fibers in 500ml of trishydroxymethylaminomethane aqueous solution with 2.5g of tannic acid dissolved in pH 8.5, stir at room temperature for 12h, and wash repeatedly with deionized water for 2min to obtain Product 1;

[0033] 0.625g of graphene oxide was added to 500ml of pH 8.5 tris buffered aqueous solution containing 2.5g of tannic acid, stirred at room temperature for 12h, and the supernatant was taken to obtain solution 2;

[0034] Product 1 was immersed in 500ml of nickel ion solution for 40 minutes, then immersed in solution 2 for 45 minutes, washed with deionized water until neutral, and then dried in vacuum at 50°C for 24 hours to obtain modified carbon fibers.

[0035] The untreated carbon fiber and the modified carbon fiber were analyzed by scanning electron microscopy, figure 1 SEM images of untreated carbon fibers, figure 2 It is a scanning electron microscope picture of the modified carbon fiber...

Embodiment 2

[0042]Immerse 0.625g of small tow polyacrylonitrile-based carbon fibers in 500ml of trishydroxymethylaminomethane aqueous solution with 2.5g of tannic acid dissolved in pH 8.5, stir at room temperature for 12h, and wash repeatedly with deionized water for 2min to obtain Product 1;

[0043] 0.625g of graphene oxide was added to 500ml of pH 8.5 tris buffered aqueous solution containing 2.5g of catechol, stirred at room temperature for 12h, and the supernatant was taken to obtain solution 2;

[0044] Product 1 was immersed in 500ml of ferric ion solution for 40 minutes, then immersed in solution 2 for 45 minutes, washed with deionized water until neutral, and then vacuum-dried at 50°C for 24 hours to obtain modified carbon fibers.

Embodiment 3

[0046] Immerse 0.625g of small-tow polyacrylonitrile-based carbon fibers in 500ml of trishydroxymethylaminomethane aqueous solution with pH 7.5 dissolved in 2.5g of tannic acid, stir at room temperature for 12h, and wash repeatedly with deionized water for 2min to obtain Product 1;

[0047] 0.625g of graphene oxide was added to 500ml of tris buffered aqueous solution with 2.5g of catechol dissolved in pH 7.5, after stirring at room temperature for 12h, the supernatant was taken to obtain solution 2;

[0048] Product 1 was immersed in 500ml of nickel ion solution for 40 minutes, then immersed in solution 2 for 45 minutes, washed with deionized water until neutral, and then dried in vacuum at 50°C for 24 hours to obtain modified carbon fibers.

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Abstract

The invention provides a carbon fiber surface complexing modification method, and belongs to the technical field of surface modification methods. The method comprises the following steps of immersing carbon fibers into a polyphenol-containing buffer solution with the pH value of 7-10, performing normal-temperature treatment for 12-48 hours, then performing washing to obtain a product 1, adding graphene oxide into the polyphenol-containing buffer solution with the pH value of 7-10, performing normal-temperature treatment for 12-48 hours, then taking supernate to obtain a solution 2, and immersing the product 1 in a transition metal ion solution for 30-60 min and then immersing the treated product 1 in the solution 2 for 30-60 min, and obtaining a final product. The raw materials adopted by the invention are green and environment-friendly, the reaction condition is mild, the process is simple, the aging is short, and the modified carbon fiber prepared by the method has good surface wettability and binding property and high interfacial strength with a resin matrix.

Description

technical field [0001] The invention belongs to the technical field of carbon fiber materials, and in particular relates to a carbon fiber surface complexation modification method. Background technique [0002] Carbon fiber (CF) is a new type of high-strength, high-modulus fiber material with a carbon content of more than 95%. It has many excellent properties. Carbon fiber has high axial strength and modulus, low density, and 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 metal, small thermal expansion coefficient and anisotropy, good corrosion resistance, etc. Therefore, it is suitable for As a reinforcing material, compound with resin, metal, ceramics and carbon to manufacture advanced composite materials. However, due to the large surface inertia of carbon fiber, low surface energy, lack of chemically active functional groups, low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/74D06M13/152D06M13/238D06M101/40
CPCD06M11/74D06M13/152D06M13/238D06M2101/40
Inventor 李明王可欣张洁杨国瑞送凌霄李铮孙丽娜
Owner CHANGCHUN UNIV OF TECH
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