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A high-performance bulk aramid nanofiber aerogel and its preparation method and application

A technology of nanofibers and aramid fibers, which is applied in the field of high-strength bulk aramid nanofiber airgel and its preparation, and can solve the problems of viscous hydrogels not forming blocks, difficulty in industrialization, and long preparation cycle , to achieve the effects of porosity and density controllable, easy to be continuous, and excellent mechanical properties

Active Publication Date: 2022-07-26
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • 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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  • A high-performance bulk aramid nanofiber aerogel and its preparation method and application
  • A high-performance bulk aramid nanofiber aerogel and its preparation method and application
  • A high-performance bulk aramid nanofiber aerogel and its preparation method and application

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preparation example Construction

[0023] A first aspect of the present invention provides a preparation method of aramid nanofiber aerogel, the method comprising the following steps:

[0024] (1) Preparation of aramid nanofiber (ANF) colloidal dispersion;

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

[0026] (3) Using the ANF wet gel to prepare ANF aerogel.

[0027] According to some preferred embodiments, in step (1), the mixing system of aramid fibers, organic solvent and alkali is subjected to stirring treatment to make the aramid fibers uniformly dispersed to obtain an aramid fiber dispersion; Adding proton donors and / or ionic reaction assistants to the fiber dispersion liquid to catalyze the reaction rate of nanometerization, and stirring to obtain the ANF colloidal dispersion liquid;

[0028] In the present invention, unless otherwise specified, the aramid fiber refers to the macro-aramid fiber with a diameter of micrometer order or larger. For example, the aramid fiber...

Embodiment 1

[0062] (1) Preparation of ANF colloidal dispersion: 6g Kevlar chopped fibers (about 12-20 microns in diameter, 6 mm in length, purchased from DuPont), 600 ml dimethyl sulfoxide (DMSO), and 1 g KOH were added to the reaction vessel, and the Under the environment of normal temperature (25°C), the high shear disperser rotates at 4000rpm and stirs for 5min to obtain a light yellow uniform dispersion of macro aramid fibers. To the dispersion, add a solution of 18g deionized water and 2g KOH at one time, A mixed solution was obtained, the rotating speed was adjusted to 5000 rpm, and the stirring reaction was continued for 1 h to 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, place the mold in a vacuum box, and let stand for 2-10 minutes to remove foam; add water , promote the phase transition of the dispersion, age at room te...

Embodiment 2

[0066] (1) Preparation of ANF colloidal dispersion: 12g of Kevlar chopped fibers used in Example 1, 600ml of dimethyl sulfoxide (DMSO), 2g of KOH, and 2g of potassium ethoxide were added to the reaction vessel. Under the rotating speed of 4000rpm, the shear disperser was stirred for 5 minutes to obtain a light yellow uniform dispersion of macro aramid fibers; 18g of deionized water and 4g of KOH were added to the dispersion, and the reaction was continued for 0.5h; then 10ml of ethanol was added , 1g potassium ethoxylate, 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 block: the same procedure as in Example 1.

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

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Abstract

The invention relates to a high-performance bulk aramid nanofiber aerogel and a preparation method and application thereof. The preparation method includes: (1) nano-forming Kevlar macroscopic fibers to prepare an aramid nanofiber colloidal dispersion; (2) preparing a bulk aramid nanofiber hydrogel by a solvent exchange phase transition method; (3) using supercritical CO 2 , atmospheric pressure and other drying processes to prepare bulk aramid nanofiber aerogels. The preparation method of Kevlar aerogel provided by the invention has simple process, is easy to realize continuous and large-scale production, and can prepare nanofiber aerogel with adjustable density and mechanical properties; the high-performance Kevlar aerogel provided by the invention Aerogels have high specific surface area, adjustable 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 new type of aerogel material, in particular to a high-strength bulk aramid nanofiber aerogel and a preparation method and application thereof. . Background technique [0002] Aerogel materials are lightweight and porous nanomaterials. 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 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 an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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