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Preparation method of silicon dioxide aerogel composite material for low-temperature cold insulation

A technology of composite materials and silica, which is applied in the field of preparation of silica airgel composite materials for low-temperature insulation, can solve the problems of loss of cold insulation effect, inconvenient pipeline arrangement, poor cold insulation effect, etc., and achieve low water absorption, The effect of low maintenance cost and simple cutting

Inactive Publication Date: 2015-05-20
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional cold insulation materials have poor waterproof performance at low temperatures, and the pipes are easily corroded by dew condensation water, losing the cold insulation effect. For example, the water absorption rate of expanded perlite particles is as high as 29% to 30%, and the traditional materials have poor cold insulation effect and large cold loss. , easy to shrink, and the thickness of the package is large, which brings a lot of inconvenience to the dense pipeline arrangement. For example, the thermal conductivity of foam glass is as high as 0.051W / (m·k)

Method used

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  • Preparation method of silicon dioxide aerogel composite material for low-temperature cold insulation
  • Preparation method of silicon dioxide aerogel composite material for low-temperature cold insulation
  • Preparation method of silicon dioxide aerogel composite material for low-temperature cold insulation

Examples

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example 1

[0027] Example 1 Add tetraethyl orthosilicate and ethanol solution in a beaker, stir magnetically, heat to 50°C, keep the temperature constant, add water, and add a small amount of hydrochloric acid to adjust the pH to 4.5, continue stirring for 30 minutes, add MTES (methyl triethyl Oxysilane), continue to stir for 60min. A small amount of ammonia water was added to adjust the pH of the solution to 6.5, and the stirring was continued for 15 min. Wherein, the molar ratio of tetraethyl orthosilicate, ethanol, water, and modifier is 1:0.5:18:4. Slowly pour the sol into the mold with the basalt fiber felt. After the gel is complete, add ethanol solution into the stainless steel mold with wet gel, subject to the fact that the gel is not covered, cover the surface with a film and put it in an oven at 50°C for aging for 2 days; pour out the ethanol aging solution after 2 days, replace Fresh pure ethanol solution was aged again for 2 days. The obtained gel composite material was su...

example 2

[0029] Example 2 Add tetraethyl orthosilicate and ethanol solution in a beaker, stir magnetically, heat to 40°C, keep the temperature constant, add water, and add a small amount of sulfuric acid to adjust the pH to 5, continue stirring for 60min, add MTES (methyl triethyl Oxysilane), continue to stir for 75min. A small amount of ammonia water was added to adjust the pH of the solution to 7, and stirring was continued for 5 min. Wherein, the molar ratio of tetraethyl orthosilicate, ethanol, water, and modifier is 1:0.5:8:4. Slowly pour the sol into the mold with the basalt fiber felt. After the gel is complete, add ethanol solution into the stainless steel mold with wet gel, subject to the fact that the gel is not covered, cover the surface with a film and put it in an oven at 50°C for aging for 1 day; pour out the ethanol aging solution after 1 day, replace Fresh pure ethanol solution was aged again for 1 day. The obtained gel composite material was supercritically dried wi...

example 3

[0031] Example 3 Add tetraethyl orthosilicate and ethanol solution in a beaker, stir magnetically, heat to 60°C, keep the temperature constant, add water, and add a small amount of nitric acid to adjust the pH to 5, continue stirring for 45min, add PTES (phenyl triethyl Oxysilane), continue to stir for 90min. A small amount of ammonia water was added to adjust the pH of the solution to 7, and stirring was continued for 15 min. Among them, the molar ratio of tetraethyl orthosilicate, ethanol, water, and modifier is 1:0.1:12:2, and the sol is slowly poured into a mold with basalt fiber felt. After the gel is complete, add ethanol solution into the stainless steel mold with wet gel, as long as the gel is not covered, cover the surface with a film and put it in an oven at 70°C for aging for 2 days; pour out the ethanol aging solution after 2 days, replace Fresh pure ethanol solution was aged again for 2 days. Altogether, the ethanol aging solution was replaced 3 times, each agin...

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Abstract

The invention relates to a preparation method of a silicon dioxide aerogel composite material for low-temperature cold insulation. The preparation method comprises the following specific steps: with tetraethyl orthosilicate as a silicon source and basaltfibers as an enhancement phase, and performing modification, solvent replacement and supercriticaldrying to obtain the fiber enhanced SiO2 aerogel composite material. The material has excellent hydrophobic property, good cold insulation property and low thermal conductivity at a normal temperature and a low temperature. The material is simple in preparation process, can be continuously produced, and has a bright industrial production application prospect.

Description

technical field [0001] The invention belongs to the technical field of heat insulation material manufacture, and in particular relates to a method for preparing a silica airgel composite material for low temperature insulation. Background technique [0002] Airgel has the characteristics of low density, high specific surface area, and high porosity, and is known as "the magic material that changes the world". Due to the existence of a large number of nano-scale holes in the airgel, it has excellent thermal insulation performance, and it is a solid material with extremely low thermal conductivity. The thermal conductivity is about 0.013W / (m k) at room temperature, which is higher than that of static air. is still low. At the same time, airgel also has the characteristics of high stability and environmental protection, and has great application prospects in low-temperature cold preservation fields such as LNG pipelines, storage tanks and aviation. Traditional cold insulation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02
Inventor 沈晓冬马佳崔升吴晓栋
Owner NANJING UNIV OF TECH
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