3D printing aramid aerogel, and preparation method and application thereof

A 3D printing and aerogel technology, applied in the field of 3D printing and nanoporous materials, can solve the problems of limited application of 3D graphene aerogel, limited material properties and applications, poor electrical conductivity and mechanical properties, etc., and achieve excellent mechanical properties. Effects of performance and structural designability, wide dispersion, fast low temperature response

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

AI Technical Summary

Problems solved by technology

[0003] CN105128127A reported the use of 3D printing technology to prepare graphene airgel. After adding the phenol-melamine-formaldehyde-furfural mixed system, the structural defects were greatly reduced, and due to the addition of collagen at the same time, the layer-to-layer relationship was improved. The binding force reduces the deformation phenomenon, but the printing ink contains a variety of additives, which affect the performance of graphene itself and limit its application
Aiming at the poor conductivity and mechanical properties of current graphene airgel products, CN107555422A reports a method for 3D printing graphene airgel based on large-size and high-concentration graphene oxide materials, but the normal temperature 3D printing process based on water system It will reduce the printing accuracy, which will limit the application of 3D graphene airgel
CN108046241A has reported a method for 3D printing ultra-porous elastic graphene airgel, but in the preparation process, ink pretreatment and material post-cleaning are required, and the preparation process is cumbersome
CN107936685A reports a preparation method of a polyimide ink that can be used for 3D printing by adding silicon dioxide to regulate the rheology of the ink, using sol-gel combined with 3D printing technology, but the addition of additives in the ink also limits the bulk material performance and application

Method used

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  • 3D printing aramid aerogel, and preparation method and application thereof
  • 3D printing aramid aerogel, and preparation method and application thereof
  • 3D printing aramid aerogel, and preparation method and application thereof

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preparation example Construction

[0043] One aspect of the embodiments of the present invention provides a method for preparing 3D printing aramid airgel, which includes:

[0044] At least uniformly mixing aramid nanofibers and a solvent to form an aramid nanofiber dispersion;

[0045] 3D printing with the aramid nanofiber dispersion liquid as a 3D printing ink by freezing-direct writing forming method to obtain 3D printing aramid cryogel;

[0046] Performing solvent replacement on the 3D printed aramid cryogel to obtain a 3D printed aramid hydrogel;

[0047] The 3D printed aramid hydrogel is dried to obtain the 3D printed aramid airgel.

[0048] In some preferred embodiments, the 3D printing ink further includes auxiliary components.

[0049] Further, the diameter of the aramid nanofiber is 1 nm-1 μm, and the length is 10 nm-900 μm.

[0050] Further, the solvent includes dimethyl sulfoxide, but is not limited thereto.

[0051] Further, the main component of the 3D printing ink is aramid nanofiber / dimethyl...

Embodiment 1

[0108] (1) Put 10wt% aramid nanofiber / dimethyl sulfoxide / water mixed dispersion in the 3D printer storage bin at room temperature, design the structure by computer and import related programs, using a needle with an inner diameter of 410 μm, in- A 3D printed aramid cryogel with pyre structure was printed at 50°C.

[0109] (2) The 3D printed aramid cryogel was replaced by deionized water at 25°C to obtain a 3D printed aramid hydrogel.

[0110] (3) The 3D printed aramid hydrogel was freeze-dried at -100°C for 72 hours to obtain the 3D printed aramid airgel.

[0111] (4) The porosity of the 3D printed aramid airgel is 95%, and the specific surface area is 1800m 2 / g, the pore volume is 9cm 3 / g.

[0112] (5) The 3D printed aramid airgel was directly immersed in a 0.01wt% fluorocarbon resin solution for 10 seconds, and vacuum-dried at 30°C for 72 hours to obtain a hydrophobic 3D printed aramid airgel material.

[0113] figure 2 Optical photographs of the hydrophobically modi...

Embodiment 2

[0115] (1) Place 8wt% aramid nanofiber / dimethyl sulfoxide / ethanol dispersion in the 3D printer storage bin at room temperature, design the structure by computer and import related programs, using a needle with an inner diameter of 510 μm, at -50 3D printed aramid cryogel with pyre structure was printed at ℃.

[0116] (2) The 3D printed aramid cryogel was replaced with absolute ethanol at -50°C to obtain the 3D printed aramid hydrogel.

[0117] (3) Dry the 3D printed aramid hydrogel by supercritical carbon dioxide for 24 hours to obtain the 3D printed aramid airgel.

[0118] (4) The porosity of the 3D printed aramid airgel is 96%, and the specific surface area is 1900m 2 / g, the pore volume is 9cm 3 / g.

[0119] (5) The 3D printed aramid airgel was directly immersed in a 20wt% fluorocarbon resin solution for 5 seconds, and left to air at room temperature for 72 hours to obtain a hydrophobic 3D printed aramid airgel material.

[0120] image 3 Optical photographs of the hyd...

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Abstract

The invention discloses a 3D printing aramid fiber aerogel, and a preparation method and an application thereof. The preparation method comprises the following steps: uniformly mixing aramid nanofibers and a solvent to form an aramid nanofiber dispersion; and carrying out sol-gel conversion and drying treatment through a freezing-direct writing forming technology to obtain the 3D printing aramid fiber aerogel. Surface hydrophobic modification and filling modification are respectively carried out on the 3D printing aramid aerogel to respectively obtain a hydrophobic material, a photochromic material and a temperature response material. The preparation method of the 3D printing aramid fiber aerogel has the advantages of wide dispersity, low energy consumption, quick low-temperature response,high printing precision, simple process and short flow, and the obtained 3D aramid aerogel has the advantages of ultralow density, good mechanical properties and structural designability, can be applied to the fields of heat preservation and insulation, catalysis, separation / adsorption, sensing, soft robots and the like, and greatly expands the application range of 3D printing and aramid aerogel.

Description

technical field [0001] The invention relates to a 3D printing airgel, in particular to a novel 3D printing aramid airgel and its preparation method and application, belonging to the technical field of 3D printing and nanoporous materials. Background technique [0002] 3D printing technology refers to making a highly customizable model directly from computer-aided design (CAD), using separation technology to decompose the model into a multi-layer structure, and stacking materials layer by layer into a physical product through a numerically controlled forming system. It mainly includes fused deposition modeling, inkjet printing technology, stereolithography, selective laser melting technology, direct writing molding technology, etc. Among them, the direct writing molding technology is a 3D printing technology based on extrusion, that is, the layer-by-layer deposition of liquid ink materials. Direct write molding technology can be compatible with a variety of materials, and ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L77/10B29C64/112B33Y10/00
CPCC08J9/28B29C64/112B33Y10/00C08J2201/0482C08J2377/10Y02P20/54
Inventor 张学同程青青
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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