Preparation method of Al2O3-SiO2 composite aerogel

An al2o3-sio2, composite aerogel technology, applied in aerogel preparation, chemical instruments and methods, colloid chemistry and other directions, can solve problems such as composite aerogels that have not yet been found, and achieve cheap raw materials, low energy consumption, and operation. safe effect

Active Publication Date: 2018-08-10
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, up to now, no direct preparation of Al by using pseudo-boehmite has been found. 2 o 3 -SiO 2 Composite airgel reports

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of Al of the present invention 2 O 3 -SiO 2 One of the embodiment of the preparation method of composite airgel, the raw material description in this example is as follows:

[0041] Pseudoboehmite (abbreviated as PB, the composition is shown in the table below, the unit is wt%)

[0042] type

Hole

specific surface

dry basis

SiO 2

Na 2 o

Fe 2 o 3

PB-04

0.37-0.45

240-280

70±2

<=0.02

<=0.10

[0043] Others are commercially available conventional products.

[0044] The test method of this example: using American Mike company ASAP2020 M+C N 2 The specific surface area of ​​the airgel was analyzed by the adsorption instrument.

[0045] The specific method is as follows:

[0046] a. Preparation of γ-AlOOH sol: Mix pseudo-boehmite and DMF according to the mass ratio of 0.8~1.2:1, and add under the action of stirring to adjust according to the mass ratio of concentrated nitric acid and pseudo-boe...

Embodiment 2

[0056] A kind of Al of the present invention 2 O 3 -SiO 2 One of the implementations of the preparation method of the composite airgel, the main technical scheme of the present embodiment 2 is basically the same as that of the embodiment 1, and the features not explained in the present embodiment 2 adopt the explanation in the embodiment 1, here No further details will be given. The difference between this example and Example 1 is that pseudo-boehmite and DMF are mixed according to the mass ratio of 3:7 (the total mass of the two is 100g), and concentrated nitric acid with a mass fraction of 65-68% is added under the action of stirring, According to the mass ratio of concentrated nitric acid to pseudo-boehmite 0.07:1, adjust the pH value to 3~4 to form γ-AlOOH sol. TEOS and ethanol were hydrolyzed at 50°C for 24 hours at a mass ratio of 1:1 (the total mass of the two was 40g) to form γ-AlOOH-SiO 2 Composite sol. At room temperature, 20 g of propylene oxide was added to th...

Embodiment 3

[0058] A kind of Al of the present invention 2 O 3 -SiO 2 One of the implementations of the preparation method of the composite airgel, the main technical scheme of the present embodiment 3 is basically the same as that of the embodiment 1, and the features not explained in the present embodiment 3 adopt the explanation in the embodiment 1, here No further details will be given. The difference between this example and Example 1 is that pseudo-boehmite and DMF are mixed according to the mass ratio of 1:1 (the total mass of the two is 100g), and concentrated nitric acid with a mass fraction of 65-68% is added under the action of stirring, According to the mass ratio of concentrated nitric acid to pseudo-boehmite 0.07:1, adjust the pH value to 3~4 to form γ-AlOOH sol. TEOS and ethanol were hydrolyzed at 50°C for 24 hours at a mass ratio of 1:2 (the total mass of the two was 40g) to form γ-AlOOH-SiO 2 Composite sol. At room temperature, 20 g of propylene oxide was added to th...

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Abstract

The invention discloses a preparation method of Al2O3-SiO2 composite aerogel. The method comprises the following steps of a, gamma-AlOOH sol preparation: pseudoboehmite is dissolved in a first solvent; an acidic substance is added so that gamma-AlOOH sol is formed; b, TEOS hydrolysis: TEOS and ethyl alcohol are added into the gamma-AlOOH sol to form gamma-AlOOH-SiO2 composite sol; c, gelation andaging: a gelatinizing agent is added into the gamma-AlOOH-SiO2 composite sol to form gamma-AlOOH-SiO2 composite gel; still standing and aging are performed; d, drying: the gamma-AlOOH-SiO2 composite gel is subjected to a drying process to obtain gamma-AlOOH-SiO2 composite aerogel; e, heat treatment: the dried gamma-AlOOH-SiO2 composite aerogel is calcined to obtain the Al2O3-SiO2 composite aerogel. Compared with the prior art, the preparation method has the advantages that the operation is safe; the energy consumption is low; the raw materials are cheap; the production cost is low; the technological process is simple.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to an Al 2 o 3 -SiO 2 Preparation method of composite airgel. Background technique [0002] Airgel is a porous condensed material composed of nanoparticles with a three-dimensional nano-network structure, and its internal dispersion medium is gas. It has broad application prospects in technical fields such as ultra-low density heat-resistant heat insulation materials, high-efficiency high-energy electrode materials, special dielectric materials, acoustic impedance coupling materials, gas absorbers and filters, high-efficiency catalysts and catalyst carriers. Al 2 o 3 -SiO 2 Composite airgel has excellent thermal and chemical stability when used at high temperature, and is also corrosion-resistant and environmentally friendly. It has important applications in the fields of refractory materials, electronics industry and building materials. Therefore Al ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 张欣陈建章
Owner HUNAN UNIV OF SCI & TECH
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