Aerogel composite material with heat insulation and stealth functions and preparation method thereof

A composite material and aerogel technology, which is applied in the field of aerogel composite materials with thermal insulation and stealth function and its preparation field, can solve the problems of uneven distribution of aerogel powder, affecting the thermal insulation and thermal insulation effects, etc. Thermal insulation and infrared stealth performance, the effect of realizing electromagnetic shielding function, reducing heat radiation performance

Active Publication Date: 2021-04-16
广东广纳新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this patent, a waterproof knitted fabric composite waterproof and breathable membrane is used to solve the problem of powder shedding during the use of the material, but this method can only prevent the airgel powder from falling out of the composite material. The shedding inside the composite material will still cause uneven distribution of airgel powder, which will affect the thermal insulation and heat insulation effect

Method used

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  • Aerogel composite material with heat insulation and stealth functions and preparation method thereof
  • Aerogel composite material with heat insulation and stealth functions and preparation method thereof
  • Aerogel composite material with heat insulation and stealth functions and preparation method thereof

Examples

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preparation example Construction

[0042] In another aspect of the present invention, there is also provided a method for preparing the above-mentioned airgel composite material with thermal insulation and stealth function, comprising the following steps:

[0043] 1) adding the silica airgel into the nanofiber suspension, and fully mixing to obtain the first composite slurry; loading the first composite slurry on the surface of the substrate to form a nanofiber airgel matrix layer;

[0044] 2) adding the silica airgel conductive material with a multi-layered structure into the nanofiber suspension, and mixing thoroughly to obtain a second composite slurry; loading the second composite slurry on the nanofibers in step 1) The surface of the airgel matrix layer forms a nanofiber airgel conductive layer;

[0045] 3) Add the composite powder material containing silica airgel and phase change material into the nanofiber suspension, and mix thoroughly to obtain the third composite slurry; load the third composite slur...

Embodiment 1

[0056] This embodiment provides a method for preparing an airgel composite material with thermal insulation and stealth function, including the following steps:

[0057] S1. Preparation of nanofiber airgel matrix layer 1

[0058] Disperse EVOH nanofibers with a diameter range of 200-800nm ​​in a solvent mixed with isopropanol and water 1:1 to make a suspension of EVOH nanofibers; Added to the EVOH nanofiber suspension, sheared at a high speed of 500rpm for 10min to make it evenly mixed to obtain the first composite slurry; in the first composite slurry, the mass fraction of silica airgel was 15 %. Then, using the non-woven fabric as the base material, the first composite slurry was sprayed on the surface of the base material 1 to form a nanofiber airgel layer 1 with a thickness of 3 mm.

[0059] S2. Preparation of nanofiber airgel conductive layer 2

[0060] Disperse silica airgel, two-dimensional material MXene, sodium anthraquinone-2-sulfonate and pyrrole monomer in deion...

Embodiment 2-3

[0074] Embodiments 2-3 respectively provide a kind of airgel composite material with thermal insulation and stealth function. Compared with Embodiment 1, the difference is that the type of substrate is changed. The substrates of Embodiment 2-3 are machine Woven cotton and knitted fabrics.

[0075] The Cro value of the substrate used in embodiment 2-3 and the airgel composite material prepared thereof is measured, and the results are as follows: Figure 5 shown. Figure 5 Among them, the woven cotton cloth and the knitted fabric represent the substrates used in Example 2-3 respectively; the airgel modified woven cotton cloth and the airgel modified knitted cloth represent the airgel composite materials prepared in Example 2-3 respectively.

[0076] Depend on Figure 5 It can be seen that the Cro values ​​of the airgel composites prepared in Examples 2-3 are significantly higher than the base material used, indicating that the method provided by the present invention can great...

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Abstract

The invention provides an aerogel composite material with a heat insulation and stealth function and a preparation method of the aerogel composite material, and belongs to the technical field of aerogel composite materials. The aerogel composite material comprises a nano-fiber aerogel matrix layer, a nano-fiber aerogel conductive layer and a nano-fiber aerogel heat insulation layer. According to the invention, under the condition of not using an adhesive, the effective fixation of aerogel particles and the tight combination between the base material and each functional layer can be realized by utilizing the unique hydrophilicity and pore structure of the nanofibers, and the heat insulation performance of the base material layer and the heat insulation layer is utilized; the electromagnetic shielding and controllable heat transmission performance of the conducting layer can achieve the heat insulation and electromagnetic infrared double-shielding synergistic function, and the invention has application prospects in the fields of national defense military industry and functional textiles.

Description

technical field [0001] The invention belongs to the technical field of airgel composite materials, and in particular relates to an airgel composite material with thermal insulation and stealth function and a preparation method thereof. Background technique [0002] Airgel is a solid material with a nanoscale three-dimensional porous structure formed by the aggregation of nanoscale particles or polymer molecular chains. Due to its unique nanopore structure, high specific surface area, low thermal conductivity and low density, It has become a new generation of lightweight thermal insulation materials, and has broad application prospects in the fields of high-speed rail, aerospace, national defense, thermal insulation, warmth and stealth. In recent years, with the development of textile technology and the improvement of people's living standards, it is difficult for single-functional textile materials to meet people's needs. How to use airgel materials to make textiles have mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02C09K3/00
Inventor 邓力
Owner 广东广纳新材料有限公司
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