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Airgel composite material with multi-scale multi-network composite structure and its preparation method

A technology of multiple networks and composite structures, applied in the field of aerogel composite materials and their preparation, can solve the problems of limitation, lack of plasticity and formability, etc. Effect

Active Publication Date: 2016-05-04
SHANGHAI SUPEREL ADVANCED MATERIAL SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the material used here lacks plasticity and formability, so the practical application is somewhat limited

Method used

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  • Airgel composite material with multi-scale multi-network composite structure and its preparation method
  • Airgel composite material with multi-scale multi-network composite structure and its preparation method
  • Airgel composite material with multi-scale multi-network composite structure and its preparation method

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preparation example Construction

[0025] The preparation method of the airgel composite material with multi-scale multi-network composite structure proposed by the present invention comprises the following steps:

[0026] (1) adding cellulose to the aqueous solution of the airgel precursor with a molar concentration of 0.6 to 2.8mol / L, so that the mass ratio of cellulose to the airgel precursor is: cellulose: airgel precursor=1 : (0.06~0.5), obtain the first solution, described cellulose is plant cellulose powder, and described airgel precursor is any one in sodium silicate, potassium silicate or sodium metaaluminate ;

[0027] (2) Add cellulose crosslinking agent to the above-mentioned first solution, so that the mass ratio of cellulose and cellulose crosslinking agent is: cellulose: cellulose crosslinking agent=1: (0.6~1.5), stir under normal temperature Evenly, the second solution is obtained, and the cellulose crosslinking agent is any one of epichlorohydrin, formaldehyde or glutaraldehyde;

[0028] (3) ...

Embodiment 1

[0037] (1) adding cellulose to the aqueous solution of the airgel precursor with a molar concentration of 1.2mol / L, so that the mass ratio of cellulose to the airgel precursor is: cellulose: airgel precursor=1:0.3 , to obtain the first solution, the cellulose is plant cellulose powder, and the airgel precursor is sodium silicate;

[0038] (2) Add cellulose cross-linking agent in above-mentioned first solution, make the mass ratio of cellulose and cellulose cross-linking agent be: cellulose: cellulose cross-linking agent=1:0.8, stir under normal temperature, obtain the first Two solutions, the cellulose crosslinking agent is epichlorohydrin;

[0039] (3) The long glass fiber network is immersed in the second solution and left still, so that the mass ratio of cellulose and the long glass fiber network is: cellulose: long glass fiber network=1:0.7, and the standing time is 45 hours, so that the first The second solution is converted into a cellulose gel with a skeleton structure...

Embodiment 2

[0046] (1) adding cellulose to the aqueous solution of the airgel precursor with a molar concentration of 1.8mol / L, so that the mass ratio of cellulose to the airgel precursor is: cellulose: airgel precursor=1:0.15 , to obtain the first solution, the cellulose is plant cellulose powder, and the airgel precursor is potassium silicate;

[0047] (2) Add cellulose cross-linking agent in above-mentioned first solution, make the mass ratio of cellulose and cellulose cross-linking agent be: cellulose: cellulose cross-linking agent=1:1.2, stir under normal temperature, obtain the second Two solutions, the cellulose cross-linking agent is formaldehyde;

[0048] (3) The long glass fiber network is immersed in the second solution and left still, so that the mass ratio of cellulose and the long glass fiber network is: cellulose: long glass fiber network=1:1.2, and the standing time is 49 hours, so that the first The second solution is converted into a cellulose gel with a skeleton struct...

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Abstract

The invention relates to an aerogel composite material with a multi-scale and multi-network composite structure and a preparation method of the aerogel composite material, belonging to the technical field of inorganic composite materials. The aerogel composite material is formed by composition of an inorganic oxide gel network, a nano-cellulose gel network and a long glass fiber network, wherein the inorganic oxide gel network and the nano-cellulose gel network form an interpenetrating network structure at nano-scale, and the interpenetrating network structure and the long glass fiber network form the aerogel composite material after forming a composite structure at macro-scale. As the aerogel composite material provided by the invention is formed by multi-scale and multi-network composition, the mechanical properties of the aerogel material can be significantly improved, and the bulk aerogel composite material with low heat conductivity, low density and high specific surface area is obtained; and in addition, the preparation cost can be reduced by adopting a freeze-drying method which is relatively cheap and safe instead of a traditional supercritical drying method.

Description

technical field [0001] The invention relates to an airgel composite material with a multi-scale and multiple network composite structure and a preparation method thereof, belonging to the technical field of inorganic composite materials. Background technique [0002] Airgel is a special gel that replaces the liquid in the gel with gas without essentially changing the network structure or volume of the gel itself. It is the product of hydrogel or organic gel after drying. It has the characteristics of nano-scale porous structure and high porosity, and is one of the solid materials with the smallest density known so far. Due to the characteristics of large specific surface area, high porosity, low density, and low thermal conductivity, aerogels have great application potential in super insulators, high-energy physics, high-efficiency catalysts and catalyst carriers, and energy storage materials. At the same time, the ultra-low density and ultra-high specific surface area of ​...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/24C04B28/26C04B14/42
Inventor 向军辉张复实赛华征
Owner SHANGHAI SUPEREL ADVANCED MATERIAL SCI & TECH CO LTD
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