Method for preparing aluminum oxide-silicon dioxide flexible aerogel thermal insulation felt

A flexible airgel and silicon dioxide technology, applied in the direction of protecting pipelines, mechanical equipment, heat exchange equipment, etc. through heat insulation, can solve the problems of high cost and complicated preparation process, and achieve low cost, simple process and flexible Good results

Active Publication Date: 2014-01-29
余煜玺
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can prepare airgel composite thermal insulation materials resistant to high

Method used

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  • Method for preparing aluminum oxide-silicon dioxide flexible aerogel thermal insulation felt
  • Method for preparing aluminum oxide-silicon dioxide flexible aerogel thermal insulation felt

Examples

Experimental program
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Effect test

Example Embodiment

[0028] Example 1

[0029] Such as figure 1 As shown, the process of this embodiment is as follows:

[0030] With the molar ratio of aluminum isopropoxide: water 1:110, take 20g aluminum isopropoxide and 180g water and place them in a container. Place the container in a water bath at 85°C and heat to reflux. Add 0.1g concentrated nitric acid with electric stirring for 4 hours, and continue stirring Alumina sol was obtained in 4h.

[0031] With the molar ratio of ethyl orthosilicate:ethanol:distilled water:alumina sol of 1:6:2:1, take 440mL of ethylorthosilicate, 720mL of ethanol, 72mL of distilled water, and 36mL of alumina sol, and add them to the container in turn. Stir electrically for 10 minutes, then add 150 mL of dilute ammonia water with 0.03mol / L ethanol as the solvent, continue to stir for 10 minutes, and pour it into a stainless steel container with 10mm thick aluminum silicate wool.

[0032] Put the stainless steel container into the autoclave, vacuum to -0.03MPa, flush wit...

Example Embodiment

[0033] Example 2

[0034] With the molar ratio of aluminum isopropoxide: water 1:200, take 20g of aluminum isopropoxide and 327g of water and place them in a container. Place the container in a water bath at 85°C and heat to reflux. Add 0.1g concentrated nitric acid with electric stirring for 4 hours, and continue stirring Alumina sol was obtained in 4h.

[0035] Take the molar ratio of methyl orthosilicate:methanol:distilled water:alumina sol to 1:8:10:5, take 440mL of ethyl orthosilicate, 960mL of ethanol, 108mL of distilled water, and 36mL of alumina sol, and add them to the container in sequence. Stir electrically for 30 minutes, add 35 mL of 0.01 mol / L dilute hydrochloric acid, continue to stir for 30 minutes, then add 150 mL of dilute ammonia with 0.03 mol / L ethanol as the solvent, continue stirring for 10 minutes, and then pour in 10mm thick aluminum silicate cotton Stainless steel container.

[0036] After sol-gel, put the stainless steel container into the autoclave, evacu...

Example Embodiment

[0037] Example 3

[0038] With the molar ratio of aluminum isopropoxide: water 1:250, take 20g aluminum isopropoxide and 409g water and place them in a glass container. The container is placed in a water bath at 85°C and heated to reflux. After stirring for 4 hours, add 0.1g concentrated nitric acid and continue. Stir for 4h to obtain alumina sol.

[0039] Take the molar ratio of methyltrimethoxysilane:ethanol:distilled water:alumina sol to 1:20:4:2, take 440mL of ethyl orthosilicate, 3200mL of ethanol, 144mL of distilled water, and 72mL of alumina sol, and add them to the container in turn , Electric stirring for 10min, add 35mL of 0.01mol / L dilute hydrochloric acid, continue stirring for 30min, then add 170mL of dilute ammonia with 0.03mol / L ethanol as the solvent, continue to stir for 6min, then pour it into a stainless steel container with glass fiber .

[0040] Put the stainless steel container into the autoclave, evacuate to -0.03MPa, flush with nitrogen to 1MPa, and electric...

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Abstract

The invention discloses a method for preparing aluminum oxide-silicon dioxide flexible aerogel thermal insulation felt. The method includes the following steps that an aluminum source is placed in water for conducting hydrolysis reaction and condensation polymerization to obtain stable aluminum oxide sol; a silicon source, water, alcohol and the aluminum oxide sol are mixed to obtain aluminum oxide-silicon dioxide sol through the hydrolysis reaction and the condensation polymerization under the action of catalysts; the aluminum oxide-silicon dioxide sol is poured to a fiber prefabricated part to form a sol dipped prefabricated part, supercritical drying is conducted on the sol dipped prefabricated part under the condition that the aluminum oxide-silicon dioxide sol is condensed or not, and then the aluminum oxide-silicon dioxide flexible aerogel thermal insulation felt is prepared, wherein the molar ratio of the aluminum source to water is 1:30-300. The method for preparing the aluminum oxide-silicon dioxide flexible aerogel thermal insulation felt is simple in technological process and low in cost.

Description

technical field [0001] The invention belongs to the field of airgel materials, and in particular relates to a method for preparing alumina-silica flexible airgel thermal insulation felt. Background technique [0002] With the increase of urbanization rate and economic development, my country's total energy consumption continues to rise. In 2011, China surpassed the United States and became the world's largest energy consumption country, with a total energy consumption of 3.48 billion tons of standard coal. During the "Eleventh Five-Year Plan" period, the energy consumption of my country's iron and steel, nonferrous metals, petrochemicals, and chemicals accounted for 40.2% of the total energy consumption. Respectively decreased by 18%, 18%, 18%, 20%. In industries such as iron and steel, nonferrous metals, petrochemicals, and chemicals, it is necessary to vigorously promote structural energy conservation, vigorously improve the level of energy utilization in the industry, str...

Claims

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Application Information

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IPC IPC(8): F16L59/02
CPCF16L59/026
Inventor 余煜玺赖德林
Owner 余煜玺
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