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Aramid fiber/carbon nanotube hybrid airgel film, its preparation method and application

A technology of carbon nanotubes and aerogels, 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 have broad application prospects. The effect of the simple preparation process

Active Publication Date: 2022-05-27
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 airgel film, its preparation method and application
  • Aramid fiber/carbon nanotube hybrid airgel film, its preparation method and application
  • Aramid fiber/carbon nanotube hybrid airgel film, its preparation method and application

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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 / carbon nanotube hybrid aerogel film, which includes:

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

[0045] The aramid nanofiber / carbon nanotube mixed dispersion is applied on a substrate, then transferred to a coagulation bath, and a hybrid gel film is formed by sol-gel replacement;

[0046] drying the hybrid gel film to obtain a hybrid aerogel film;

[0047] The hybrid aerogel film is infiltrated with at least a hydrophobic resin solution, and dried, so that at least part of the hydrophobic resin covers the hybrid aerogel film to obtain an aramid fiber / carbon nanotube hybrid aerogel film.

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

[0049] (1) dispersing carbon ...

Embodiment 1

[0078] Multi-walled carbon nanotubes are added to dimethyl sulfoxide, and the mass fraction of multi-walled carbon nanotubes dispersion is 0.1wt%. Stir at 20°C to prepare a mass fraction of 0.1wt% para-aramid nanofiber dispersion; then mix the multi-walled carbon nanotube dispersion and para-aramid nanofiber dispersion in a mass ratio of 0.2:1, Spin coating at 5000 rpm, then transfer to an ethanol coagulation bath to perform sol-gel replacement with water to form a hybrid gel film, and then supercritically dry to obtain a hybrid aerogel film; The gel film was immersed in the silicone resin solution for 1 s, taken out, and dried at room temperature to obtain an aramid / carbon nanotube hybrid aerogel film with a thickness of 10 μm. figure 2 The SEM photograph of the aramid / carbon nanotube hybrid aerogel film obtained in this example is shown. For other parameters, please refer to Table 1.

Embodiment 2

[0080] The single-walled carbon nanotubes were added to N-methylpyrrolidone to prepare a single-walled carbon nanotube dispersion with a mass fraction of 0.5 wt%, and para-aramid fiber and potassium tert-butoxide were added to N - Stir in methyl pyrrolidone at 30°C to prepare a mass fraction of 10wt% para-aramid nanofiber dispersion; then mix the single-walled carbon nanotube dispersion and para-aramid nanofiber dispersion in a mass ratio of 1:0.2 Mix uniformly, spin coating, the rotation speed is 500 rpm, then transfer to methanol coagulation bath to perform sol-gel replacement with ethanol to form a hybrid gel film, and then freeze-dry at -80 ° C under the condition of less than 0.1 kPa to obtain Hybrid aerogel film; the hybrid aerogel film is immersed in a silicone modified resin solution for 30s, taken out, and dried at room temperature to obtain an aramid / carbon nanotube hybrid aerogel film with a thickness of 500 μm. image 3 The nitrogen isotherm adsorption and desorpti...

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Abstract

The invention discloses an aramid fiber / carbon nanotube hybrid airgel film, its preparation method and application. The aramid / carbon nanotube hybrid airgel film includes a connected three-dimensional network porous structure and a hydrophobic layer covered on the three-dimensional network porous structure, and the three-dimensional network porous structure is composed of aramid nanofibers and carbon The nanotubes are formed by overlapping each other. The preparation method includes: mixing the carbon nanotube dispersion and the aramid nanofiber dispersion to form a mixed dispersion; and applying it on the substrate, then transferring it to a coagulation bath, and forming a hybrid gel film through sol-gel replacement , and then dried to obtain a hybrid airgel film, and finally infiltrated with a hydrophobic resin solution to obtain an aramid fiber / carbon nanotube hybrid airgel film. The hybrid airgel film of the present invention has good mechanical, electrical and hydrophobic properties, as well as excellent Joule heating effect and electromagnetic shielding performance, and can be applied to fields such as smart films, personal thermal management, and wearable electromagnetic protection.

Description

technical field [0001] The invention relates to an aerogel film, in particular to an aramid fiber / carbon nanotube hybrid aerogel film, a preparation method and application thereof, and belongs to the technical field of new nanomaterials. Background technique [0002] Originated in the early 1930s, aerogel 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, making it suitable for use in catalyst carriers, environment, etc. Areas such as purification, temperature management and energy storage systems are of great value. At present, it has been extended from inorganic aerogels to organic aerogels and carbon aerogels, and aerogel fibers and aerogel films have been developed from aerogel blocks. Among them, the aerogel film not only has the porosity of aerogel, but also inherits the structural properties of the film, and has broad application prospects in ...

Claims

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Application Information

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Patent Type & Authority Patents(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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