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A kind of dopamine/polyetheramine multilayer modified carbon fiber and its preparation method

A multi-layer modification and carbon fiber technology, which is applied in the fields of carbon fiber, fiber treatment, textiles and papermaking, etc., can solve the problem that high strength and high toughness of carbon fiber composite materials cannot exist at the same time, achieve good economic benefits and industrial application prospects, low cost, general fitness effect

Active Publication Date: 2021-08-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to improve the surface activity of carbon fiber, improve the wettability of carbon fiber and epoxy resin, solve the problem that high strength and high toughness of carbon fiber composite materials cannot exist at the same time, and provide a kind of dopamine / polyetheramine multilayer modified carbon fiber and its Preparation

Method used

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  • A kind of dopamine/polyetheramine multilayer modified carbon fiber and its preparation method
  • A kind of dopamine/polyetheramine multilayer modified carbon fiber and its preparation method
  • A kind of dopamine/polyetheramine multilayer modified carbon fiber and its preparation method

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Effect test

Embodiment 1

[0044] Step 1. Carbon fiber surface cleaning

[0045] Using acetone as a solvent, the high-strength polyacrylonitrile-based carbon fiber was condensed and refluxed at 70°C for 24 hours by Soxhlet extraction, and then dried at 60°C to obtain the cleaned carbon fiber. figure 1 ;

[0046] Step 2, Tris buffer preparation

[0047] Thoroughly mix Tris and deionized water with ultrasonic vibration for 5 minutes at a mass ratio of 1:1000, then slowly add 1mol / L hydrochloric acid solution into the mixture of Tris and deionized water to adjust The pH value of the solution was 8 and ultrasonically oscillated for 5 minutes to obtain tris buffer solution;

[0048] Step 3, preparation of polyetheramine solution

[0049] Take 0.1g of polyetheramine with a molecular weight of 400 and add it to 100ml of organic solvent dimethylformamide, ultrasonically shake for 10min and mix thoroughly;

[0050] Step 4, preparation of carbon fiber surface polydopamine layer

[0051] Immerse the cleaned car...

Embodiment 2

[0057] Step 1. Carbon fiber surface cleaning

[0058] Using acetone as a solvent, the high-strength polyacrylonitrile-based carbon fiber was condensed and refluxed at 75°C for 36 hours by Soxhlet extraction method, and then dried at 70°C;

[0059] Step 2, Tris buffer preparation

[0060] Thoroughly mix Tris and deionized water with ultrasonic vibration for 7 minutes at a mass ratio of 1.2:1000, then slowly add 1.5 mol / L hydrochloric acid solution into the mixture of Tris and deionized water, Adjust the pH value of the solution to 8.5 and ultrasonically vibrate for 7 minutes to obtain tris buffer solution;

[0061] Step 3, preparation of polyetheramine solution

[0062] Take 0.12g of polyetheramine with a molecular weight of 400 and add it to 150ml of organic solvent ethanol, ultrasonically shake for 15min and mix thoroughly;

[0063] Step 4, preparation of carbon fiber surface polydopamine layer

[0064] Immerse the cleaned carbon fibers in 130ml tris buffer solution by di...

Embodiment 3

[0071] Step 1. Carbon fiber surface cleaning

[0072] Using acetone as a solvent, the high-strength polyacrylonitrile-based carbon fiber was condensed and refluxed at 80°C for 48 hours by Soxhlet extraction method, and then dried at 80°C;

[0073] Step 2, Tris buffer preparation

[0074] Thoroughly mix Tris and deionized water with ultrasonic vibration at a mass ratio of 2:1000 for 10 minutes, then slowly add 2mol / L hydrochloric acid solution into the mixture of Tris and deionized water to adjust The pH value of the solution was 9 and ultrasonically oscillated for 10 minutes to obtain tris buffer solution;

[0075] Step 3, preparation of polyetheramine solution

[0076] Take 0.2g of polyetheramine with a molecular weight of 400 and add it to 200ml of organic solvent tetrahydrofuran, ultrasonically shake for 30min and mix thoroughly;

[0077] Step 4, preparation of carbon fiber surface polydopamine layer

[0078] Immerse the cleaned carbon fiber in 200ml of tris buffer by d...

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Abstract

A dopamine / polyetheramine multilayer modified carbon fiber and a preparation method thereof, in which a polydopamine layer and a polyetheramine layer are sequentially coated on the surface of the carbon fiber, and so repeated 0-4 times to prepare a dopamine / polyetheramine multilayer modified carbon fiber. The polydopamine layer has a rigid molecular structure, the polyetheramine layer has a flexible long-chain molecular structure, and the dopamine / polyetheramine multilayer has a shell-like multilayer structure in which rigid and flexible segments are alternately arranged. Promote stress redistribution, increase the chemical bonding between fiber and resin, improve the wettability of fiber and resin, thereby improving the interfacial bonding strength of composite materials. The rigid polydopamine layer of the invention has the ability to deflect cracks and initiate microcracks, and the flexible polyetheramine layer promotes mutual sliding between polydopamine layers, enhances plastic deformation, and thus improves the interface toughness of the composite material.

Description

technical field [0001] The invention belongs to the technical field of surface and interface modification application of materials, and in particular relates to a dopamine / polyetheramine multilayer modified carbon fiber and a preparation method thereof. Background technique [0002] With the development of modern high-tech, carbon fiber composite materials have become one of the important symbols to measure the advanced level of a country's science and technology. Carbon fiber composite materials are widely used in aerospace, automobile industry, medical treatment, construction, fitness equipment and other fields due to their excellent properties such as specific strength and specific modulus. The excellent performance of composite materials is not only related to the carbon fiber and matrix, but also related to whether the two-phase interface can effectively transfer stress. However, the chemical inertness of the carbon fiber surface leads to poor wettability between carbon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M15/37D06M13/328D06M15/53C08L63/00C08K9/04C08K7/06C08J5/06D06M101/40
Inventor 武清万勤勤王芬朱建锋和金茜赵如意杨欣
Owner SHAANXI UNIV OF SCI & TECH
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