Aramid fiber/carbon nanotube hybrid aerogel film and preparation method and application thereof

A technology of carbon nanotubes and hybrid gels, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve problems that are difficult to meet market needs, achieve excellent Joule heating effect and electromagnetic shielding performance, and simple preparation process , excellent mechanical effect

Active Publication Date: 2020-04-10
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hybrid aerogels currently prepared are all bulk, which is difficult to meet the needs of the market.

Method used

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  • Aramid fiber/carbon nanotube hybrid aerogel film and preparation method and application thereof
  • Aramid fiber/carbon nanotube hybrid aerogel film and preparation method and application thereof
  • Aramid fiber/carbon nanotube hybrid aerogel film and preparation method and application thereof

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preparation example Construction

[0043] Another aspect of the embodiments of the present invention also provides a method for preparing an aramid fiber / carbon nanotube hybrid airgel film, which includes:

[0044] At least uniformly mixing the carbon nanotube dispersion and the aramid nanofiber dispersion to form an aramid nanofiber / carbon nanotube mixed dispersion;

[0045] Applying the aramid nanofiber / carbon nanotube mixed dispersion on a substrate, then transferring to a coagulation bath, and forming a hybrid gel film through sol-gel replacement;

[0046] Drying the hybrid gel film to obtain a hybrid airgel film;

[0047] The hybrid airgel film is at least soaked with a hydrophobic resin solution, dried, and at least part of the hydrophobic resin is coated on the hybrid airgel film to obtain an aramid fiber / carbon nanotube hybrid airgel film.

[0048] In a more preferred embodiment, the preparation method of the aramid fiber / carbon nanotube hybrid airgel film comprises:

[0049] (1) Dispersing the carbon...

Embodiment 1

[0078] Multi-walled carbon nanotubes are added to dimethyl sulfoxide to prepare a multi-walled carbon nanotube dispersion with a mass fraction of 0.1wt%. Para-aramid and sodium hydroxide are added to dimethyl sulfoxide at a mass ratio of 1:0.2 Stirring in 20 ℃, the preparation mass fraction is 0.1wt% p-aramid nanofiber dispersion; then the multi-walled carbon nanotube dispersion and p-aramid nanofiber dispersion are mixed evenly according to the mass ratio of 0.2:1, Spin-coating, the speed used is 5000rpm, and then transferred to an ethanol coagulation bath for sol-gel replacement with water to form a hybrid gel film, and then supercritically dried to obtain a hybrid airgel film; the hybrid gas The gel film was immersed in the silicone resin solution for 1 second, then taken out, and dried at room temperature to obtain an aramid / carbon nanotube hybrid airgel film with a thickness of 10 μm. figure 2 The SEM photo of the aramid fiber / carbon nanotube hybrid airgel film obtained ...

Embodiment 2

[0080] Add single-walled carbon nanotubes to N-methylpyrrolidone to prepare a dispersion of single-walled carbon nanotubes with a mass fraction of 0.5 wt%. Para-aramid and potassium tert-butoxide are added to N Stirring in methylpyrrolidone at 30°C to prepare a para-aramid nanofiber dispersion with a mass fraction of 10wt%; then the single-walled carbon nanotube dispersion and the para-aramid nanofiber dispersion in a mass ratio of 1:0.2 Mix evenly, spin-coat at a speed of 500rpm, and then transfer to a methanol coagulation bath for sol-gel replacement with ethanol to form a hybrid gel film, and then freeze-dry at -80°C and less than 0.1kPa to obtain Hybrid airgel film: soak the hybrid airgel film in the silicone modified resin solution for 30 seconds, take it out, and dry it at room temperature to obtain an aramid fiber / carbon nanotube hybrid airgel film with a thickness of 500 μm. image 3 The nitrogen isotherm adsorption-desorption curve of the aramid fiber / carbon nanotube ...

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Abstract

The invention discloses an aramid fiber/carbon nanotube hybrid aerogel film and a preparation method and application thereof. The aramid fiber/carbon nanotube hybrid aerogel film comprises a communicating three-dimensional network-shaped porous structure and a hydrophobic layer covering the three-dimensional network-shaped porous structure, wherein the three-dimensional network-shaped porous structure is formed by mutually overlapping aramid fiber nanofibers and carbon nanotubes. The preparation method comprises the following steps: mixing a carbon nanotube dispersion liquid and an aramid nanofiber dispersion liquid to form a mixed dispersion liquid; applying the formed mixed dispersion liquid to a substrate, transferring the substrate to a coagulating bath, and carrying out sol-gel replacement to form a hybrid gel film; performing drying treatment to obtain a hybrid aerogel film; and finally, infiltrating the hybrid aerogel film with a hydrophobic resin solution to obtain the aramid fiber/carbon nanotube hybrid aerogel film. The hybrid aerogel film provided by the invention has good mechanical, electrical and hydrophobic properties and excellent Joule heat effect and electromagnetic shielding performance, and can be applied to the fields of intelligent films, personal thermal management, wearable electromagnetic protection and the like.

Description

technical field [0001] The invention relates to an airgel film, in particular to an aramid fiber / carbon nanotube hybrid airgel film and its preparation method and application, belonging to the technical field of new nanometer materials. Background technique [0002] Airgel originated in the early 1930s. It is a synthetic solid material. The continuous porous network structure makes it have extremely low density, ultra-high specific surface area and ultra-low thermal conductivity. Areas such as purification, temperature management, and energy storage systems are of great value. At present, it has expanded from inorganic aerogels to organic aerogels and carbon aerogels, and developed airgel fibers and airgel films from airgel blocks. Among them, the airgel film not only has the porosity of airgel, but also inherits the structural properties of the film, and has broad application prospects in emerging fields such as batteries, water purification, supercapacitors, and personal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/42C08J9/28C08J5/18C08L77/10C08K3/04C08L83/04C08L27/12C08L27/16C08L27/18C08L27/06C01B32/168
CPCC08J9/42C08J9/286C08J5/18C01B32/168C08J2205/026C08J2377/10C08K3/041C08K2201/011C08J2201/0482C08J2201/0502C08J2483/04C08J2427/12C08J2427/16C08J2427/18C08J2427/06
Inventor 张学同吕婧胡沛英
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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