Preparation method of Al2O3-SiO2 composite aerogel material by ambient drying

An al2o3-sio2, composite aerogel technology, applied in aerogel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problems of high cost, high risk, complexity of supercritical drying equipment, etc. Cost, Surface Tension Reduction, High Risk Reduction Effects

Inactive Publication Date: 2019-07-23
QILU UNIV OF TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is in order to solve the complexity of supercritical drying equipment, the problem of high r

Method used

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  • Preparation method of Al2O3-SiO2 composite aerogel material by ambient drying
  • Preparation method of Al2O3-SiO2 composite aerogel material by ambient drying

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specific Embodiment approach 1

[0021] Specific implementation mode 1: This implementation mode is based on Al prepared under normal pressure 2 o 3 -SiO 2 The preparation method of composite airgel is realized according to the following steps:

[0022] 1. Prepare silica sol according to the molar ratio of tetraethyl orthosilicate, deionized water and absolute ethanol as 1:4:6; according to the molar ratio of aluminum chloride hexahydrate, deionized water and absolute ethanol The ratio is 1:40:15, and the alumina sol is formulated;

[0023] 2. According to the molar ratio of Si in the silica sol and Al in the alumina sol being 1:1, the silica sol was mixed with the alumina sol, stirred magnetically for 3 hours, and mixed uniformly to obtain a silica-alumina composite sol;

[0024] 3. Add coagulant propylene oxide to the silica-alumina composite sol, the mol ratio of propylene oxide to Al in alumina is 8:1, after standing for 12 hours, obtain the silica-alumina composite gel;

[0025] 4. Stand still for 12...

Embodiment 2

[0032] Specific implementation mode 1: This implementation mode is based on Al prepared under normal pressure 2 o 3 -SiO 2 The preparation method of composite airgel is realized according to the following steps:

[0033] 1. Prepare silica sol according to the molar ratio of tetraethyl orthosilicate, deionized water and absolute ethanol as 1:2:4; according to the molar ratio of aluminum chloride hexahydrate, deionized water and absolute ethanol The ratio is 1:50:12, and the alumina sol is formulated;

[0034] 2. According to the molar ratio of Si in the silica sol and Al in the alumina sol being 1:2, the silica sol and the alumina sol were mixed, stirred by magnetic force for 4 hours, and mixed uniformly to obtain the silica-aluminum composite sol;

[0035] 3. Add coagulant propylene oxide to the silica-alumina composite sol, the mol ratio of propylene oxide to Al in alumina is 6:1, after standing for 24 hours, obtain the silica-alumina composite gel;

[0036] 4. Stand stil...

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Abstract

The invention discloses a preparation method of an Al2O3-SiO2 composite aerogel material by ambient drying, relates to a preparation method of an aerogel material, and aims to solve the problem of poor mechanical properties of pure aluminum aerogel and to lower preparation cost and risk. The preparation method comprises the following steps: 1, mixing silica sol and alumina sol to obtain silicon-aluminum composite sol; 2, performing solvent replacement on the silicon-aluminum composite sol with an ethanol/isopropanol solution in certain proportion; 3, modifying the gel through a mixed solutionof trimethylchlorosilane and n-hexane; 4, adding n-hexane to the modified gel for solvent replacement again; and 5, preparing by ambient drying. According to the preparation method provided by the invention, the ambient drying method is adopted, and the mechanical properties of alumina aerogel is enhanced by composite silica; the morphology of aerogel subjected to calcining at 1,200 DEG C can still be maintained, and the aerogel has good high-temperature resistance.

Description

technical field [0001] The invention relates to an airgel preparation method under normal pressure. The method uses a sol-gel method to prepare a composite material with good thermal insulation performance through heat treatment at different temperatures. Background technique [0002] Airgel, also known as xerogel. After most of the solvent in the gel is removed, the mass is greatly reduced. The gas acts as a medium instead of the solvent and fills the space network structure of the gel. At this time, the appearance of the substance is still solid, and the substance formed in this way is a dry gel, that is airgel. [0003] In recent decades, a lot of research has been done on the development of high temperature insulation materials. Because of its light weight and good thermal insulation performance, aerogel has attracted the attention of scientists. In airgel materials, Al 2 o 3 The high temperature performance of airgel is better, but Al 2 o 3 After 1000°C, a phase...

Claims

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Application Information

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IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 杜毅孙馨越
Owner QILU UNIV OF TECH
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