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Flexible hydrophobic block silica aerogel and preparation method thereof

A silica and aerogel technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of high energy consumption of supercritical drying technology, unfavorable for continuous production, complicated operation steps, etc. Reduced cycle times, low density, and reduced operational hazards

Pending Publication Date: 2021-10-01
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has complex operation steps and a long preparation cycle, which is not conducive to continuous production
Publication No. CN 107128933 B provides a method for preparing silica airgel based on water glass solution. The method uses diluted water glass solution as a precursor, and obtains silica by rotary evaporation and supercritical method. Airgel, supercritical drying technology consumes a lot of energy and is dangerous to operate

Method used

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  • Flexible hydrophobic block silica aerogel and preparation method thereof
  • Flexible hydrophobic block silica aerogel and preparation method thereof
  • Flexible hydrophobic block silica aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This example provides a method for preparing a flexible and hydrophobic bulk silica aerogel, which specifically includes the following steps:

[0035] S100, adding 5ml of methyltrimethoxysilane and 10ml of deionized water into 5ml of ethanol, and adding 0.1g of CTAB, stirring evenly to obtain a precursor solution;

[0036] S200, adding 800 μl of hydrochloric acid with a concentration of 0.1M to the obtained precursor solution while stirring, and stirring at room temperature for 30 minutes after sealing;

[0037] S300. Add 0.045 g of microcrystalline cellulose to the hydrolyzed precursor solution and ultrasonically disperse it for 10 minutes;

[0038] S400. Continue to add a few drops of ammonia water with a concentration of 0.5 mol / L while stirring, adjust the pH to 7.5, and let it stand at room temperature until it gels.

[0039] S500, adding 30ml of ethanol liquid to seal the gel to make it age, the aging time is 8 hours, and the aging temperature is 45°C. After rec...

Embodiment 2

[0042] This example provides a method for preparing a flexible and hydrophobic bulk silica aerogel, which specifically includes the following steps:

[0043] S100, adding 5ml of methyltrimethoxysilane and 10ml of deionized water into 5ml of ethanol, and adding 0.1g of CTAB, stirring evenly to obtain a precursor solution;

[0044] S200, adding 800 μl of hydrochloric acid with a concentration of 0.1M to the obtained precursor solution while stirring, and stirring at room temperature for 30 minutes after sealing;

[0045] S300. Add 0.090 g of microcrystalline cellulose to the hydrolyzed precursor solution and ultrasonically disperse it uniformly for 10 min;

[0046] S400, continue to stir while adding a few drops of ammonia water with a concentration of 1mol / L, adjust the pH to 7, and let it stand at room temperature until it gels (the gel is successful if the container is tilted at 45° and the liquid surface does not flow);

[0047] S500, adding 30ml of ethanol liquid to seal t...

Embodiment 3

[0049] This example provides a method for preparing a flexible and hydrophobic bulk silica aerogel, which specifically includes the following steps:

[0050] S100, adding 5ml of methyltrimethoxysilane and 11ml of deionized water into 4ml of ethanol, and adding 0.1g of CTAB, stirring evenly to obtain a precursor solution;

[0051] S200, adding 800 μl of hydrochloric acid with a concentration of 0.1M to the obtained precursor solution while stirring, and stirring at room temperature for 30 minutes after sealing;

[0052] S300. Add 0.045 g of microcrystalline cellulose to the hydrolyzed precursor solution and ultrasonically disperse it for 10 minutes;

[0053]S400. Continue to add a few drops of ammonia water with a concentration of 1 mol / L while stirring, adjust the pH to 8, and let it stand at room temperature until it gels (if the container is tilted at 45° and the liquid surface does not flow, it means that the gel is successful);

[0054] S500, adding 30ml of ethanol liquid...

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Abstract

The invention belongs to the technical field of silicon dioxide aerogel preparation, and particularly relates to flexible hydrophobic block silicon dioxide aerogel and a preparation method thereof. The method comprises the following steps: S100, mixing methyl trimethoxysilane, a surfactant, ethanol and deionized water; S200, adding an acid catalyst into the precursor solution under a stirring condition; S300, adding micro-crystalline cellulose into the hydrolyzed precursor solution, and ultrasonically dispersing uniformly; S400, adding an alkali catalyst into the solution obtained in the step S300 under a stirring condition; and S500, aging and replacing the obtained gel in a water bath, and then drying to obtain the flexible hydrophobic block silica aerogel. The method has no surface modification process; normal-pressure drying is adopted, so that the cost and the operation danger are greatly reduced; and the obtained silica aerogel is a flexible hydrophobic block-shaped material, and has the advantages of strong hydrophobicity, small density and good flexibility.

Description

technical field [0001] The invention belongs to the technical field of silica airgel preparation, and in particular relates to a flexible and hydrophobic bulk silica airgel and a preparation method thereof. Background technique [0002] Silica airgel has many excellent properties, such as large specific surface area, high porosity, low thermal conductivity and low density. Due to these unique physical properties, silica aerogels are often used as catalysts, thermal insulation materials, adsorption materials, etc., and have broad application prospects in medicine, construction, energy, aerospace and other fields. [0003] At present, silicon source precursors commonly used in the preparation of silica airgel include organic silicon precursors such as sodium silicate, tetraethyl orthosilicate, and methyltriethoxysilane as raw materials. Using sol-gel technology, through organic Polymerization of silicon precursors to form completely disordered covalent polymers, followed by a...

Claims

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Application Information

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IPC IPC(8): C01B33/158C01B33/152
CPCC01B33/1585C01B33/152C01P2006/90
Inventor 张云飞杨兆华张桥杜飞鹏李亮鄢国平
Owner WUHAN INSTITUTE OF TECHNOLOGY