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Preparation process of high-temperature-resistant hydrophobic silicon dioxide aerogel heat-isolating blanket

A silica and preparation technology, applied in the field of chemical materials, can solve the problems of limiting the application of hydrophobic airgel, poor high-temperature hydrophobic performance, etc., and achieve the effects of short preparation cycle, less solvent consumption and no environmental pollution

Inactive Publication Date: 2017-04-26
GUIZHOU AEROSPACE WUJIANG MACHINERY & ELECTRICITYEQUIP
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation process of high temperature resistant hydrophobic silica airgel thermal insulation felt, so as to solve the problem of poor high temperature hydrophobic performance of the existing silica airgel thermal insulation materials, which limits the Problems with Gels Applied at High Temperatures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation process of the high-temperature-resistant hydrophobic silica airgel thermal insulation felt includes the following steps: preparation of silica gel liquid → mixing of modifier and sol → molding of glass fiber felt airgel → aging → drying → detection. Prepare silica airgel glue in the following volume ratio: ethyl orthosilicate: 99% industrial methanol: hydrolysis catalyst: additive = 17:136:5, and the amount of additive added is 7‰ of the total mass of the above mixed solution. The hydrolysis catalysts are 99.5% oxalic acid and 0.01mol / l ammonia solution, the additive is nano-sized magnesium hydroxide, and the reaction time is 1.5h. Add an appropriate amount of basic catalyst to the above sol, adjust the PH value to 8-10, inject and lay a layer with a thickness of 10mm and a density of 165kg / m 3 In the shallow groove of the glass fiber needle mat, the glass fiber mat is saturated to absorb the glue solution, the glass fiber mat has no bubbles or depressi...

Embodiment 2

[0031] The preparation process of the high-temperature-resistant hydrophobic silica airgel thermal insulation felt includes the following steps: preparation of silica gel liquid → mixing of modifier and sol → molding of glass fiber felt airgel → aging → drying → detection. Prepare the silica airgel glue in the following volume ratio: ethyl orthosilicate: 99% industrial alcohol: hydrolysis catalyst: additive = 17:136:5, and the amount of additive added is 7‰ of the total mass of the above mixed solution. The hydrolysis catalysts are 99.5% oxalic acid and 0.01mol / l ammonia solution, the additive is nano-sized magnesium hydroxide, and the reaction time is 1.5h. Add an appropriate amount of basic catalyst to the above sol, adjust the PH value to 8-10, inject and lay a layer with a thickness of 10mm and a density of 165kg / m 3 In the shallow groove of the glass fiber needle mat, the glass fiber mat is saturated to absorb the glue solution, the glass fiber mat has no bubbles or depre...

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Abstract

The invention provides a preparation process of a high-temperature-resistant hydrophobic silicon dioxide aerogel heat-isolating blanket. The high-temperature-resistant hydrophobic silicon dioxide aerogel heat-isolating blanket is mainly prepared by doping magnesium hydroxide into a glass fiber compound silicon dioxide aerogel by virtue of a sol-gel method and a supercutical fluid CO2 drying technology based on excellent characteristics of magnesium hydroxide. The high-temperature-resistant hydrophobic silicon dioxide aerogel heat-isolating blanket prepared by the process provided by the invention has excellent insulating property and mechanical property, good high-temperature-resistant hydrophobic property, and is convenient to construct. The preparation method avoids a step of replacing a solvent, and is simple to operate, controllable in process and continuous in production. The preparation process provided by the invention belongs to the technical field of chemical materials.

Description

technical field [0001] The invention relates to a preparation process of a high-temperature-resistant hydrophobic silicon dioxide airgel heat-insulating blanket, which belongs to the technical field of chemical materials. Background technique [0002] SiO 2 Airgel is a light nanoporous amorphous solid material with controllable structure, its porosity is as high as 80%-99.8%, the pore size is 1-100nm, and the high specific surface area is 200-1000 m 2 / g, low density change range 3~500kg / m 3 , The thermal conductivity at normal temperature and pressure is less than 0.013 W / m.K, which is lower than that of still air (0.026 W / m.K), and it is the solid material with the lowest thermal conductivity at present. [0003] At present, the main problems faced by the industrialization of silica airgel include: complex preparation process, long preparation cycle, large solvent consumption, and many waste liquids, etc., especially the infrared heat radiation of pure silica airgel incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02
CPCC04B30/02C04B2201/20C04B2201/32
Inventor 曹勇潘江波宋大为
Owner GUIZHOU AEROSPACE WUJIANG MACHINERY & ELECTRICITYEQUIP
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