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Composite material of modified carbon fibers and nanoaramid fibers and preparation method of composite material

A technology of aramid fibers and composite materials, which is applied in the field of composite fiber preparation, can solve the problems of restricting the performance of carbon fiber and aramid fiber composite materials, lack of chemically active functional groups, poor deposition effect, etc., and achieve enhanced adhesion and Hydrophilic, excellent mechanical properties, low density effect

Inactive Publication Date: 2018-10-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the smooth surface of aramid fiber itself, lack of chemically active functional groups, and low reactivity, the deposition effect of chopped fibers on the surface of carbon fibers is very poor, which restricts the improvement of the performance of carbon fiber and aramid fiber composites.

Method used

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  • Composite material of modified carbon fibers and nanoaramid fibers and preparation method of composite material
  • Composite material of modified carbon fibers and nanoaramid fibers and preparation method of composite material
  • Composite material of modified carbon fibers and nanoaramid fibers and preparation method of composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051]This embodiment provides a composite material of modified carbon fiber / nano-aramid fiber and a preparation method thereof.

[0052] (1) Weighing 2g of carbon fiber, cleaning, filtering and drying the carbon fiber with lye in sequence, and then ultrasonically cleaning, filtering and drying the carbon fiber with deionized water again to obtain pretreated carbon fiber.

[0053] (2) Dissolving the pretreated carbon fiber in Tris-HCl buffer solution with pH=8.5, adding 0.5g / L dopamine solution, mixing and soaking for 24 hours. Then filter the solution, wash the precipitate with water, and dry to obtain the dopamine-modified carbon fiber.

[0054] (3) Dissolve the dopamine-modified carbon fiber in 50mL of DMSO solution, stir well, slowly add 0.5g of NaOH solid powder, then place it in a constant temperature water bath at 60°C, and then add 5mL of 2,3-epoxypropyltri Methylammonium chloride, fully stirred, and then filtered to obtain a precipitate, which was washed with DMSO an...

Embodiment 2

[0062] This embodiment provides a composite material of modified carbon fiber / nano-aramid fiber and a preparation method thereof.

[0063] (1) Weighing 5 g of carbon fiber, washing, filtering and drying the carbon fiber with lye in sequence, and then ultrasonically cleaning, filtering and drying the carbon fiber with water again to obtain pretreated carbon fiber.

[0064] (2) Dissolve the pretreated carbon fibers in a Tris-HCl buffer solution with pH=8.5, add 2.5g / L dopamine solution, mix and soak for 36 hours. Then filter the solution, wash the precipitate with water, and dry to obtain the dopamine-modified carbon fiber.

[0065] (3) Dissolve the dopamine-modified carbon fiber in 150mL of DMSO solution, stir well, slowly add 1.5g of KOH solid powder, then place it in a constant temperature water bath at 60°C, and then add 15mL of 2,3-epoxypropyl trimethylammonium chloride, fully stirred, and then filtered to obtain a precipitate, which was washed with DMSO and deionized wate...

Embodiment 3

[0071] This embodiment provides a composite material of modified carbon fiber / nano-aramid fiber and a preparation method thereof.

[0072] (1) Weighing 3g of carbon fiber, washing, filtering and drying the carbon fiber with lye in sequence, and then ultrasonically cleaning, filtering and drying the carbon fiber with water again to obtain pretreated carbon fiber.

[0073] (2) Dissolving the pretreated carbon fiber in Tris-HCl buffer solution with pH=8.5, adding 1.5g / L dopamine solution, mixing and soaking for 30h. Then filter the solution, wash the precipitate with water, and dry to obtain the dopamine-modified carbon fiber.

[0074] (3) Dissolve the dopamine-modified carbon fiber in 150mL of DMSO solution, stir well, slowly add 2.0g of KOH solid powder, then place it in a constant temperature water bath at 60°C, and then add 8mL of 2,3-epoxypropyl trimethyl ammonium chloride, fully stirred, and then filtered to obtain a precipitate, which was washed with DMSO and deionized wa...

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Abstract

The invention belongs to the technical field of composite fibers and particularly relates to a composite material of modified carbon fibers and nanoaramid fibers and a preparation method of the composite material. The method comprises the following steps; firstly, covering the surfaces of the carbon fibers with a layer of polydopamine composite film to obtain polydopamine modified carbon fibers; secondly, enabling the polydopamine modified carbon fibers to be positively charged by a catiomic reagent, and compounding the positively-charged polydopamine modified carbon fibers with the nanoaramidfibers. The obtained composite material has the characteristics of low density, high intensity, high modulus and the like. The carbon fibers are modified by adopting dopamine, so that an adhesive force and hydrophily of the surface of aramid fibers are enhanced. By adopting the nanoaramid fibers to replace conventional aligned chopped aramid fibers, deposition of the aramid fibers on the surfacesof the carbon fibers is facilitated, and synergism of the carbon fibers and the aligned aramid fibers is realized. The composite material and aramid fibrids are subjected to mixed suction filtrationto obtain a composite film. Compared with a composite film formed by suction filtration of the carbon fibers and the aramid fibrids, the composite film disclosed by the invention has the advantages that a maximum force is increased by 28.0 percent, a stress value is increased by 22.0 percent and a contact angle is increased by 20.2 degrees.

Description

technical field [0001] The invention belongs to the technical field of preparation of composite fibers, and in particular relates to a composite material of modified carbon fiber / nano-aramid fiber and a preparation method thereof. Background technique [0002] Carbon fiber (CF) is a fibrous microcrystalline graphite material with a carbon content of more than 95%. It has the advantages of light weight, high strength, high modulus, and corrosion resistance. Therefore, it is usually combined with other materials to form carbon fiber. Composite materials are widely used in aerospace, sports and leisure, automobiles, construction and bridge reinforcement and other fields. The strength of carbon fiber reinforced composites largely depends on the adhesion between carbon fibers and the composite matrix. Due to the inert surface of unmodified carbon fiber, its direct compounding with other materials will easily lead to poor interfacial adhesion, which limits its application field. ...

Claims

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Application Information

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IPC IPC(8): C08L77/10C08K9/04C08K7/06C08J5/18
CPCC08J5/18C08J2377/10C08K7/06C08K9/04C08L2205/16C08L77/10
Inventor 薛宇慧李友明雷利荣侯轶
Owner SOUTH CHINA UNIV OF TECH
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