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Method for preparing silicon dioxide aerogel by using alcohol amine as alkaline catalyst

A silica and catalyst technology, applied in the field of inorganic porous materials, can solve the problems of high industrial production cost, limited popularization and use, and slow drying, and achieve the effects of fast drying rate, shortened preparation cycle, and enhanced strength

Inactive Publication Date: 2013-04-17
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Supercritical drying method: The solvent is required to be in a supercritical state of high temperature and high pressure. The drying is slow, the energy consumption is high, the process is cumbersome, dangerous, the industrial production cost is high, and the popularization and use are limited.

Method used

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  • Method for preparing silicon dioxide aerogel by using alcohol amine as alkaline catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Pour TEOS, absolute ethanol, and deionized water into a plastic beaker at a molar ratio of 1:3 to 10:3 to 10, mix well, and add 0.5 to 3ml of hydrochloric acid (0.8 to 2%, v / v ), after stirring for 1-5 hours, slowly add 1-5 ml of monoethanolamine solution dropwise (mono-ethanolamine: deionized water=1:5-20, v / v). After gelling, place it in a water bath at 60°C for aging, replace the original solvent with acetone every 24 hours, and take it out after 3 to 5 days. Put it in a vacuum drying oven at a vacuum degree of 3×10 4 Drying is carried out under Pa environment. The temperature was raised every 5°C by means of a temperature program, from 40°C to 60°C, and each temperature segment was maintained for 1 hour. The porosity of the prepared airgel is greater than 87%, and the specific surface area is 724.63m 2 / g, the pore volume is 1.36cm 3 / g, the average pore diameter is 14.75nm.

Embodiment 2

[0024] Pour TEOS, absolute ethanol, and deionized water into a plastic beaker in a ratio of 1:3 to 10:3 to 10, mix well, and add 0.5 to 4ml of hydrochloric acid (0.8 to 2%, v / v), after stirring for 1 to 5 hours, slowly add 1 to 5 ml of diluted diethanolamine dropwise (diethanolamine: deionized water = 1:2 to 10, v / v). After gelling, place it in a water bath at 50°C for aging, replace the original solvent with absolute ethanol every 24 hours, and take it out after 3 to 6 days. In vacuum degree 4×10 4 Drying is carried out under Pa environment. The temperature was raised every 5°C by means of a temperature program, from 25°C to 50°C, and each temperature segment was maintained for 2 hours. The porosity of the prepared airgel is >84%, and the specific surface area is 625.41m 2 / g, the pore volume is 1.44cm 3 / g, the average pore diameter is 12.03nm.

Embodiment 3

[0026] Pour TEOS, absolute ethanol, and deionized water into a plastic beaker in a ratio of 1:3 to 10:3 to 10, mix well, and add 0.5 to 3ml of hydrochloric acid (0.8 to 2%, v / v), after stirring for 1-5 hours at normal temperature and pressure, slowly add 1-5 ml of diluted diglycolamine (diglycolamine: deionized water = 1:2-4, v / v) dropwise. After gelling, place it in a water bath at 60°C for aging, replace the original solvent with absolute ethanol every 24 hours, and take it out after 3 to 6 days. In vacuum degree 7×10 4 Drying is carried out under Pa environment. The temperature was raised every 5°C by means of a temperature program, from 25°C to 50°C, and each temperature segment was maintained for 2 hours. The porosity of the prepared airgel is >80%, and the specific surface area is 427m 2 / g, the pore volume is about 1.25cm 3 / g, the average pore diameter is 11.56nm.

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Abstract

The invention provides a method for preparing a silicon dioxide aerogel by using as alcohol amine as alkaline catalyst. The alcohol amine is alkaline and has a hydroxyl group, and catalyzes the hydrolysis of ethyl orthosilicate under acidic conditions. The silicon dioxide aerogel is prepared from ethyl orthosilicate as a silicon source by the sol-gel method and the acid / base two-step catalysis. The method comprises the following steps: ethyl orthosilicate is gelated in the presence of an alcohol amine solution and then aged, the water is replaced by a solvent, and the reaction product is dried by programmable heating under a reduced pressure. The silicon dioxide aerogel has an extremely-low heat conduction coefficient and is used as a light-weight high-efficiency heat insulation material.

Description

technical field [0001] The invention belongs to the field of inorganic porous materials, and proposes a method for preparing nanoporous silicon dioxide airgel by using alcohol amine as a basic catalyst and vacuum drying technology. Background technique [0002] The energy crisis has always been a major concern of all countries in the world. With the depletion of traditional energy sources, such as: coal, oil, natural gas and other non-renewable energy sources, in order to achieve the purpose of sustainable development, in addition to the research and development of new energy sources such as solar energy and nuclear energy, energy conservation is vigorously advocated, and research and development of heat insulation and heat preservation Porous materials are very necessary. [0003] Silica airgel has a nano-network structure inside, which has the characteristics of large specific surface area, low density and low thermal conductivity. It has a wide range of applications in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/14
Inventor 王雪枫黄雪莉付军怀王文金
Owner XINJIANG UNIVERSITY
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