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A kind of silica airgel material and preparation method thereof

A technology of silica and aerogel, which is applied in aging, acidification, sol-gel, modification, and drying processes. It can solve the problems of many impurities, containing chloride ions and fluoride ions, and the cumbersome and time-consuming process of desalination, etc., to achieve High transparency, low content, and the effect of promoting gel aging

Active Publication Date: 2016-03-23
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. Weigh 25g of phosphoric acid with a concentration of 30%wt, and then add diluted water glass to phosphoric acid while stirring until the 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 nitrogen...

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 wt50%, and then add diluted water glass to 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, th...

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Abstract

The invention relates to a silica airgel material and its preparation method, in particular to sodium ion, potassium ion and other metal salts generated by adding an acid-containing organic solvent that does not contain chloride ions and fluoride ions by using water glass as a silicon source The precipitation of ions is removed by filtration to obtain high-purity silica sol, and then the silica airgel material is obtained through sol-gel, aging, acidification, modification, and drying processes. The acidification treatment before modification improves the reactivity of the surface of the silica gel, thereby significantly improving the effect and efficiency of the modification. The invention has low cost, simple and high-efficiency process, and is beneficial to large-scale and high-efficiency production. The entire process does not contain chloride ions and fluoride ions, which improves the safety and reliability of equipment operation, and the product can be used in industries with high anti-corrosion requirements. The thermal insulation of nuclear power and liquefied natural gas equipment and pipelines can also be used for thermal insulation in aerospace, petrochemical, rail transit, marine vehicles, construction and other fields.

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 Patents(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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