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High-performance bulk aramid nanofiber aerogel as well as preparation method and application thereof

A nanofiber and aramid fiber technology is applied in the field of high-strength bulk aramid nanofiber aerogel and its preparation. , to achieve the effects of adjustable porosity and density, easy continuity, and excellent mechanical properties

Active Publication Date: 2021-06-18
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the viscous hydrogel prepared by the existing mixing system does not form a block, and the suction filtration is difficult, the preparation cycle is long, and it is difficult to realize industrialization, and the airgel prepared by freeze-drying has a large pore size. Airgel is fluffy and not easy to form blocks, and the problem of low skeleton strength

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  • High-performance bulk aramid nanofiber aerogel as well as preparation method and application thereof
  • High-performance bulk aramid nanofiber aerogel as well as preparation method and application thereof
  • High-performance bulk aramid nanofiber aerogel as well as preparation method and application thereof

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preparation example Construction

[0023] The first aspect of the present invention provides a kind of preparation method of aramid fiber nanofiber airgel, described method comprises the following steps:

[0024] (1) preparing aramid fiber nanofiber (ANF) colloidal dispersion;

[0025] (2) using the ANF colloidal dispersion to prepare bulk ANF wet gel;

[0026] (3) ANF airgel was prepared by using the ANF wet gel.

[0027] According to some preferred embodiments, in step (1), the mixed system of aramid fiber, organic solvent and alkali is stirred so that the aramid fiber is dispersed uniformly to obtain aramid fiber dispersion; Adding proton donors and / or ionic reaction aids to the fiber dispersion to catalyze the nano-reaction speed, and stirring to obtain the ANF colloidal dispersion;

[0028] In the present invention, unless otherwise specified, the aramid fiber refers to a macroscopic aramid fiber with a diameter of micron order or larger. For example, the aramid fiber used as a raw material in step (1) ...

Embodiment 1

[0062] (1) Preparation of ANF colloidal dispersion: 6g Kevlar chopped fibers (approximately 12-20 microns in diameter, 6 mm in length, purchased from DuPont), 600ml dimethylsulfoxide (DMSO), 1gKOH are added in the reaction vessel, and Under normal temperature (25°C) environment, high-shear disperser at 4000rpm, stirring for 5 minutes to obtain a light yellow uniform dispersion of macro-aramid fiber, add 18g of deionized water and 2g of KOH solution to the dispersion at one time, To obtain the mixed liquid, adjust the rotational speed to 5000 rpm, continue to stir and react for 1 hour, and obtain a black-red uniform transparent aramid nanofiber colloidal dispersion.

[0063] (2) Preparation of ANF wet gel block: Pour the ANF colloidal dispersion obtained in step (1) into a custom-shaped mold, put the mold in a vacuum box, and let it stand for 2-10 minutes to defoam; add water , to promote the phase transition of the dispersion, aging at room temperature for 48 hours, and changi...

Embodiment 2

[0066] (1) Preparation of ANF colloidal dispersion: the Kevlar chopped fibers used in 12g embodiment 1, 600ml dimethyl sulfoxide (DMSO), 2g KOH, 2g potassium ethoxide are added in the reaction vessel, under normal temperature environment, high At the speed of 4000rpm of the shear disperser, stir for 5min to obtain a light yellow uniform dispersion of macro-aramid fibers; add 18g of deionized water and 4g of KOH to the dispersion, and continue stirring for 0.5h; then add 10ml of ethanol , 1g of potassium ethoxide, adjust the rotating speed to 3000rpm and continue to stir for 2h to obtain a black-red uniform transparent aramid nanofiber colloidal dispersion.

[0067] (2) Preparation of ANF wet gel blocks: the same steps as in Example 1.

[0068] (3) Preparation of ANF airgel blocks: the same steps as in Example 1.

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Abstract

The invention relates to high-performance bulk aramid nanofiber aerogel as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) nanosizing Kevlar macroscopic fibers to prepare an aramid nanofiber colloidal dispersion liquid; (2) preparing bulk aramid nanofiber hydrogel by a solvent exchange phase transition method; and (3) preparing the bulk aramid nanofiber aerogel by adopting supercritical CO2, normal pressure and other drying processes. The preparation method of the Kevlar aerogel, provided by the invention, is simple in process, is easy to realize continuous and large-scale production, and can be used for preparing the nanofiber aerogel with adjustable density and mechanical properties; the high-performance Kevlar aerogel provided by the invention has a relatively high specific surface area, controllable density, controllable porosity, low thermal conductivity and high temperature resistance.

Description

technical field [0001] The invention relates to the technical field of new nanometer materials, in particular to a novel airgel material, in particular to a high-strength bulk aramid nanofiber airgel and its preparation method and application. . Background technique [0002] Airgel material is a kind of lightweight porous nanomaterial. The preparation process usually requires supercritical drying or freeze drying to replace the liquid in the wet gel with gas without significantly changing the network structure of the gel, so it has a specific surface area. Large, high porosity, low thermal conductivity, low density and other unique properties. At present, it has been expanded from traditional inorganic aerogels to organic aerogels and carbon aerogels, and the building blocks of its skeleton structure have expanded from traditional nanoparticles to one-dimensional nanofibers, graphene two-dimensional ultrathin nanosheets, etc. With the rapid development of science and techn...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L77/10
CPCC08J9/28C08J2377/10C08J2205/026Y02P20/54
Inventor 马冠香刘韬李文静赵英民张凡权成杨洁颖
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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