Conductive aramid nanofiber composite aerogel and preparation method thereof

A composite aerogel and nanofiber technology, applied in electromagnetic measurement devices, electric/magnetic solid deformation measurement and other directions, can solve the problem of poor compression resilience, aramid nanofiber aerogels have no electrical conductivity, and cannot be applied to pressure sensors. and other problems, to achieve the effect of high compression resilience, simple and easy preparation process, and high strength

Active Publication Date: 2020-04-21
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a conductive aramid nanofiber composite airgel and its preparation method, to overcome the lack of electrical conductivity, poor compression resilience and inability to be applied to pressure sensors, etc. The problem of application in the field, the present invention adopts new process and new method to develop and produce conductive aramid nanofiber composite airgel with low density, high strength, high sensitivity, long cycle stability and service life, and the preparation process is simple and feasible , with broad application prospects

Method used

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  • Conductive aramid nanofiber composite aerogel and preparation method thereof
  • Conductive aramid nanofiber composite aerogel and preparation method thereof
  • Conductive aramid nanofiber composite aerogel and preparation method thereof

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preparation example Construction

[0031] A preparation method of conductive type aramid fiber nanofiber composite airgel, comprising the following steps:

[0032] Step 1: prepare aramid nanofiber dispersion liquid, 1g length is the aramid fiber chopped fiber of 6mm, 1.5g potassium hydroxide, 500ml dimethyl sulfoxide, a certain amount of deionized water, the volume of deionized water and two The volume ratio of methyl sulfoxide is (1:50~1:15); add potassium hydroxide first, then add deionized water, and stir with a magnetic stirrer for 5min~20min, then add aramid chopped fiber and The order of adding dimethyl sulfoxide is placed in a sealed beaker, and the magnetic stirrer is used to stir the reaction at a speed of 1200r / min to 1500r / min for 2h to 4h to obtain a mass concentration of 0.2% dispersed in dimethyl sulfoxide. Aramid nanofiber dispersion liquid in, wherein the diameter of aramid nanofiber is 12-15nm, and the length is 4-7μm;

[0033] Step 2: Prepare whisker carbon nanotube dispersion liquid: whisker...

Embodiment 1

[0040] A conductive aramid nanofiber composite airgel, the conductive aramid nanofiber composite airgel is composed of aramid nanofibers and carbon nanotubes, and the mass ratio of the aramid nanofibers to carbon nanotubes is 70: 30; The mass of the conductive aramid nanofiber composite airgel is 1000 mg, and the density is 50 mg / cm 3 .

[0041] A preparation method of conductive type aramid fiber nanofiber composite airgel, comprising the following steps:

[0042] Step 1: prepare aramid nanofiber dispersion liquid, 1g length is the aramid fiber chopped fiber of 6mm, 1.5g potassium hydroxide, 500ml dimethyl sulfoxide, a certain amount of deionized water, the volume of deionized water and two The volume ratio of methyl sulfoxide is 1:50; according to the order of adding potassium hydroxide first, then adding deionized water, stirring with a magnetic stirrer for 5 minutes, and then adding aramid chopped fiber and dimethyl sulfoxide in sequence Place in a sealed beaker, and use...

Embodiment 2

[0048] A conductive aramid nanofiber composite airgel, the conductive aramid nanofiber composite airgel is composed of aramid nanofibers and carbon nanotubes, and the mass ratio of the aramid nanofibers to carbon nanotubes is 65: 35; The mass of the conductive aramid nanofiber composite airgel is 800mg, and the density is 45mg / cm 3 .

[0049] A preparation method of conductive type aramid fiber nanofiber composite airgel, comprising the following steps:

[0050] Step 1: prepare aramid nanofiber dispersion liquid, 1g length is the aramid fiber chopped fiber of 6mm, 1.5g potassium hydroxide, 500ml dimethyl sulfoxide, a certain amount of deionized water, the volume of deionized water and two The volume ratio of methyl sulfoxide is 1:40; according to the order of adding potassium hydroxide first, then adding deionized water, stirring with a magnetic stirrer for 8 minutes, and then adding aramid chopped fiber and dimethyl sulfoxide in sequence Place it in a sealed beaker, and use...

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Abstract

The invention discloses a conductive aramid nanofiber composite aerogel and a preparation method thereof. By using aramid nano-fibers with a nano-scale structure, high strength, a large length-diameter ratio and high temperature resistance as a matrix and using whisker carbon nanotubes with high crystallinity and high rigid structure are used as a conductive filler and a reinforced filling material, the conductive aramid nanofiber composite aerogel with low density, high strength and high compression resilience is prepared. The preparation method specifically comprises the following steps: preparing an aramid nanofiber dispersion liquid, preparing a whisker carbon nanotube dispersion liquid, preparing a whisker carbon nanotube/aramid nanofiber composite dispersion liquid, preparing a gelatinous whisker carbon nanotube/aramid nanofiber composite material, and the like, thereby obtaining the conductive aramid nanofiber composite aerogel. The preparation process is simple and easy to implement, and the obtained conductive aramid nanofiber composite aerogel has wide application prospects in the fields of pressure sensing, intelligent sensors, wearable equipment and the like.

Description

technical field [0001] The invention belongs to the field of polymer nanometer materials and strain sensors, and in particular relates to a conductive type aramid fiber nanofiber composite airgel and a preparation method thereof. Background technique [0002] Due to the characteristics of high porosity, low density, and controllable three-dimensional porous structure, aerogels show broad application prospects in the fields of adsorption, heat insulation, and energy storage. Conductive aerogels not only have the advantages of the above-mentioned aerogels, but also have great application potential in fuel cells, catalysis, supercapacitors, sensors, wearable devices and other fields due to their excellent electrical conductivity. At present, most conventional conductive aerogels are carbon-based aerogels obtained by high temperature (>1000°C) pyrolysis. Oxygen-free and other harsh conditions, so it is usually not possible to mass-produce. In addition, traditional carbon-ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L77/10C08L39/06C08K7/06G01B7/16
CPCC08J9/28G01B7/16C08J2377/10C08J2439/06C08K2201/011C08K2201/003C08K2201/004C08K2201/001C08K7/06C08J2205/026C08J2201/0482C08J2201/0484
Inventor 杨斌王琳张美云谭蕉君宋顺喜丁雪瑶
Owner SHAANXI UNIV OF SCI & TECH
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