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Preparation method of carbon nano tube-Kevlar nanofiber composite film

A technology of Kevlar fibers and carbon nanotubes, applied in the field of materials, can solve the problems of long time, complicated procedures, and reduce the mutual agglomeration of nanomaterials, and achieve the effects of low cost, fast preparation speed, and reduced poor dispersion

Active Publication Date: 2015-04-29
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method adopts the deprotonation method to realize the dispersion of Kevlar nanofibers in common solvents; the layer-by-layer self-assembly method is used to control the growth of multilayer films at the nanometer scale, and realize the control of material structure and components. Reduce the mutual agglomeration of nanomaterials, improve the dispersion of carbon nanotubes in Kevlar; propose a method of suction-assisted layer-by-layer assembly, which overcomes the problems of complicated procedures, long time, and a lot of repetitive labor in common layer-by-layer assembly methods ; Finally, a composite film with excellent mechanical, electrical and thermal properties was prepared

Method used

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  • Preparation method of carbon nano tube-Kevlar nanofiber composite film
  • Preparation method of carbon nano tube-Kevlar nanofiber composite film
  • Preparation method of carbon nano tube-Kevlar nanofiber composite film

Examples

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Embodiment 1

[0029] This embodiment provides a method for preparing a composite film with a carbon nanotube mass fraction of 2.5%, and the specific preparation steps are as follows:

[0030] 1. Preparation of Kevlar nanofibers: Weigh 1 g of Kevlar fibers (DuPont, K69), dry them in a vacuum drying oven for 24 hours, and take them out for use. Take 1.5 g of lithium hydroxide, put it into 500 ml of dimethyl sulfoxide with the dried Kevlar fiber and magnetically stir it for 1 week to obtain a dark red Kevlar nanofiber solution.

[0031] 2. Preparation of carbon nanotube dispersion: Weigh 20 mg of multi-walled carbon nanotubes, add 120 ml of concentrated sulfuric acid and concentrated nitric acid mixture with a volume ratio of 3:1, stir for 4 hours at 60 ° C, and then ultrasonically shake for 2 Hour. The resulting solution was diluted with deionized water, filtered through a microporous membrane, and the solid on the membrane was washed until the pH of the filtrate was 7, and the obtained blac...

Embodiment 2

[0036] This embodiment provides a method for preparing a composite film with a carbon nanotube mass fraction of 3%, and the specific preparation steps are as follows:

[0037] 1. Preparation of Kevlar nanofibers: Weigh 1.5 g of Kevlar fibers (DuPont, K69), dry them in a vacuum oven for 24 hours, and take them out for use. Take 2g of lithium hydroxide, put the dried Kevlar fiber into 750ml of dimethyl sulfoxide and magnetically stir for 1 week to get a dark red Kevlar nanofiber solution.

[0038] 2. Preparation of carbon nanotube dispersion: Weigh 30 mg of multi-walled carbon nanotubes, add 150 ml of concentrated sulfuric acid and concentrated nitric acid mixture with a volume ratio of 3:1, stir for 4 hours at 60 ° C, and then ultrasonically shake for 2 Hour. The resulting solution was diluted with deionized water, filtered through a microporous membrane, and the solid on the membrane was washed until the pH of the filtrate was 7, and the obtained black precipitate was dried i...

Embodiment 3

[0044] This embodiment provides a method for preparing a composite film with a carbon nanotube mass fraction of 5%, and the specific preparation steps are as follows:

[0045] 1. Preparation of Kevlar nanofibers: Weigh 2 g of Kevlar fibers (DuPont, K69), dry them in a vacuum drying oven for 12 hours, and take them out for use. Take 2 g of lithium hydroxide, put the dried Kevlar fiber into 1000 ml of dimethyl sulfoxide and magnetically stir for 1 week to obtain a dark red Kevlar nanofiber solution.

[0046] 2. Preparation of carbon nanotube dispersion: Weigh 30 mg of multi-walled carbon nanotubes, add 180 ml of concentrated sulfuric acid and concentrated nitric acid mixture with a volume ratio of 3:1, stir for 4 hours at 60 ° C, and then ultrasonically shake for 2 Hour. The resulting solution was diluted with deionized water, filtered through a microporous membrane, and the solid on the membrane was washed until the pH of the filtrate was 7, and the obtained black precipitate ...

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Abstract

The invention discloses a preparation method of a carbon nano tube-Kevlar nanofiber composite film. The preparation method comprises the following steps: a carbon nano tube and Kevlar nanofiber, which are treated with acid, are used as raw materials, the two materials with excellent mechanical properties are compounded effectively for the first time, and a thought of vacuum filtration assisted layer-by-layer assembly is put forward to prepare the carbon nano tube-Kevlar nanofiber composite film. The carbon nano tube and the Kevlar nanofiber are effectively compounded for the first time to prepare the carbon nano tube enhanced Kevlar nanofiber composite film; the carbon nano tube enhanced Kevlar nanofiber composite film inherits the advantages of the carbon nano tube and a Kevlar fiber monomer in the aspects of heat, electricity and mechanics and the like. A layer-by-layer self-assembly method is adopted, so that the problem that the carbon nano tube has poor dispersibility in a polymer is reduced. The vacuum filtration assisted self-assembly method is presented, and has the characteristics of being simple and feasible, low in cost, and high in preparation speed on the basis of keeping the advantages of layer-by-layer assembly.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a preparation method of a carbon nanotube-Kevlar nanofiber super-strength composite film. Background technique [0002] Carbon nanotubes have excellent thermal, electrical and mechanical properties, and their low density, large aspect ratio, and high mechanical properties make them show great potential as polymer-based reinforcement phases. However, the poor dispersion of carbon nanotubes in polymers hinders the manifestation of many of their excellent properties in macroscopic bodies. At this stage, most of the polymer-based composites with carbon nanotubes as the reinforcing phase have limited improvement in mechanical properties, and some polymers even have a "repulsion" reaction to carbon nanotubes. As a new type of aramid fiber, Kevlar fiber is widely used in chemical industry, machinery, energy, military industry and other fields due to its outstanding mechanical propertie...

Claims

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Application Information

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IPC IPC(8): C08L77/10C08J5/18C08K9/02C08K7/24
CPCC08J5/18C08K7/24C08K9/02C08L2203/16C08L2205/16C08L77/10
Inventor 杨明曹文鑫岳明丽侯莹朱嘉琦韩杰才
Owner HARBIN INST OF TECH
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