Silicon dioxide aerogel material and preparation method thereof

A silica and aerogel technology, applied in the acidification and drying process, can solve the problems of containing chloride ions and fluoride ions, many impurities, cumbersome and time-consuming process of desalination, etc., achieving less content, high transparency, and promoting gel aging. Effect

Active Publication Date: 2014-09-10
浙江圣润纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In order to solve the problems of the traditional water glass silicon source preparation airgel material process, there are many impurities, the desalination process is cumbersome and time-consuming, and the chloride ion fluorine ion is contained, etc., a silica airgel material and its preparation method are proposed. It includes the following steps:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Weigh 80 g of sodium water glass with a modulus of 3.3, add 60 g of pure water and stir evenly to obtain diluted water glass. Take by weighing 20 g of sulfuric acid with a concentration of 40%wt, and then add diluted water glass to the sulfuric acid while stirring until the pH value is 3. Continue adding 300 g of 95%wt ethanol while stirring. The precipitate in the sol was removed with a centrifugal filter to obtain a transparent and clear silica sol. Ammonia water with a concentration of 1%wt was added dropwise to the silica sol, and the pH was adjusted to 4.1. After 50 minutes, it gelled, and it was aged at room temperature for 5 hours. Put the aged gel into 500ml of mixed solution of 40%wt sulfuric acid and 95% ethanol with a mass ratio of 2:8 and soak at room temperature for 3h to carry out acidification. Put the acidified gel into 500ml of hexamethyldisilazane, and carry out hydrophobization modification at room temperature. After 6 hours, the modification was c...

Embodiment 2

[0055] Weigh 80 g of sodium water glass with a modulus of 3.6, add 80 g of pure water and stir evenly to obtain diluted water glass. Concentration is taken by weighing phosphoric acid 25g that is 30%wt, then diluted water glass is joined in phosphoric acid while stirring, until pH value is 2.3. Continue to add 95%wt methanol 300g while stirring. The precipitate in the sol was removed with a vacuum filter to obtain a transparent and clear silica sol. Add sodium hydroxide with a concentration of 1%wt to the silica sol dropwise, adjust the pH to 4.3, gel after 30min, and let it stand for aging at 40°C for 6h. Put the aged gel into 500ml of mixed solution of 40%wt sulfuric acid and propanol with a mass ratio of 3:7 and soak for 3h at 35°C for acidification. Put the acidified gel into 500ml of dimethyldiethoxysilane, and carry out hydrophobization modification at 50°C. After 8 hours, the modification was completed, and the gel was dried with nitrogen hot air for 5 hours, and the...

Embodiment 3

[0057] Weigh 80 g of potassium water glass with a modulus of 3.3, add 100 g of pure water and stir evenly to obtain diluted water glass. Weigh 10 g of acetic acid with a concentration of wt 50%, and then add diluted water glass into the acetic acid while stirring until the pH value is 3. Continue to add acetone 300g while stirring. Use a pressurized titanium rod filter to remove the precipitate in the sol to obtain a transparent and clear silica sol. Add potassium hydroxide with a concentration of 1% to the silica sol dropwise, adjust the pH to 3.7, add titanium dioxide opacifier and stir evenly, pour it into a box covered with glass fiber needle felt, gel after 90 minutes, and age at 25°C for 7 hours. Put the aged gel into 500ml of a mixture of 40% oxalic acid and absolute ethanol with a mass ratio of 2:8 and soak for 3.5 hours at 25°C for acidification. Put the acidified gel into 500ml of hexamethyldisiloxane, and carry out hydrophobization modification at 50°C. After 7h,...

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Abstract

The invention relates to a silicon dioxide aerogel material and a preparation method thereof. The method comprises the following steps: by using water glass as silicon source, adding an acid-containing organic solvent free of chlorine ions and fluorine ions to generate a precipitate of sodium ions, potassium ions and other metal salt ions, filtering to remove the precipitate to obtain high-purity silica sol, carrying out a sol-gel process, aging, acidifying, modifying, and drying to obtain the silicon dioxide aerogel material. The acidification before modification enhances the surface reaction activity of the silicon gel, thereby obviously enhancing the modification effect and efficiency. The method has the advantages of low cost and simple and efficient technique, is beneficial to mass high-efficiency production, is free of chlorine ions and fluorine ions in the whole technical process, and enhances the equipment operation safety and reliability; and the product can be used for heat preservation and thermal insulation of nuclear power and liquefied natural gas equipment and pipelines with higher requirement for corrosion resistance, and can also be used for thermal insulation in the field of aerospace, petrochemical engineering, track transportation, ships, automobiles, construction and the like.

Description

technical field [0001] The invention relates to a silica airgel material and a preparation method thereof, in particular to using water glass as a silicon source, adding an acid-containing organic solvent that does not contain chloride ions and fluoride ions, and quickly removes salt to obtain high-purity silica sol. After sol-gel, aging, acidification, modification, and drying processes, the airgel material is obtained. The airgel material does not contain chloride ions and fluorine ions, and can be used for thermal insulation of nuclear power and liquefied natural gas equipment and pipelines with high anti-corrosion requirements. It can also be used in aerospace, petrochemical, rail transit, marine vehicles, Insulation of refrigerator cold storage, construction and other fields. Background technique [0002] Airgel is a new type of nano-insulation material. It was invented by American Kistler.S. in 1931. It is also called "blue smoke" and "frozen smoke". One of the top 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16C01B33/145C04B28/24C04B14/38C04B14/42C04B16/06
Inventor 金承黎
Owner 浙江圣润纳米科技有限公司
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