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Hydrophobic lipophilic soft aerogel block and preparation method thereof

A hydrophobic, lipophilic and aerogel technology, which is applied in the field of aerogels, can solve the problems of long preparation time and achieve the effects of simple preparation process, good hydrophobic effect and light weight

Inactive Publication Date: 2014-09-03
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of airgel has a certain degree of elasticity, and it has the characteristics of hydrophobic and lipophilic, but the preparation time is long, and the prepared airgel cannot be bent arbitrarily

Method used

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  • Hydrophobic lipophilic soft aerogel block and preparation method thereof
  • Hydrophobic lipophilic soft aerogel block and preparation method thereof
  • Hydrophobic lipophilic soft aerogel block and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] At room temperature, mix methyltriethoxysilane: dimethyldiethoxysilane: ethanol: deionized water in a molar ratio of 0.6:0.4:2:6 in a container, and add 1.4g of surfactant hexadecane at the same time Base trimethylammonium bromide CTAB, put the mixed solution on a stirrer and stir evenly. Add dropwise 1.12ml of hydrochloric acid with a molar concentration of 0.1mol / L to the mixed solution to promote hydrolysis. After stirring for 2 hours, 12 ml of ammonia water with a molar concentration of 5 mol / L was added dropwise, and after stirring for 10 minutes, the solution was poured into an airtight container and gelled at room temperature. Add ethanol to cover the wet gel, and replace the ethanol every 8h to remove the surfactant in the gel. After aging at room temperature for 2 days, the obtained wet gel was placed in an autoclave for supercritical fluid drying to obtain a co-precursor hydrophobic, lipophilic and soft airgel block.

[0028] The density of the prepared airg...

Embodiment 2

[0030] At room temperature, mix methyltriethoxysilane: dimethyldiethoxysilane: ethanol: deionized water in a molar ratio of 0.5:0.5:2:6 in a container, and add 1.3g of surfactant hexadecane at the same time Base trimethylammonium bromide CTAB, put the mixed solution on a stirrer and stir evenly. Add dropwise 1.4ml of dilute acetic acid with a molar concentration of 0.1mol / L to the mixed solution to promote hydrolysis. After stirring for 8 hours, 11 ml of ammonia water with a molar concentration of 5 mol / L was added dropwise, and after stirring for 10 minutes, the solution was poured into a closed container and gelled at room temperature. Add ethanol to cover the wet gel, and replace the ethanol every 8h to remove the surfactant in the gel. After aging at room temperature for 2 days, the obtained wet gel was placed in an autoclave for supercritical fluid drying to obtain a co-precursor hydrophobic, lipophilic and soft airgel block.

[0031] The density of the prepared airgel ...

Embodiment 3

[0033] At room temperature, mix methyltriethoxysilane: dimethyldiethoxysilane: methanol: deionized water in a molar ratio of 0.6:0.4:2:6 in a container, and add 1g of surfactant hexadecyl at the same time Trimethylammonium chloride CTAC, put the mixed solution on a stirrer and stir evenly. Add 1.5 ml of hydrochloric acid with a molar concentration of 0.1 mol / L dropwise to the mixed solution to promote hydrolysis. After stirring for 24 hours, 10 ml of ammonia water with a molar concentration of 5 mol / L was added dropwise, and after stirring for 10 minutes, the solution was poured into a closed container and gelled at room temperature. Add methanol to cover the wet gel, and replace the methanol every 8h to remove the surfactant in the gel. After aging at room temperature for 2 days, the obtained wet gel was placed in an autoclave for supercritical fluid drying to obtain a co-precursor hydrophobic, lipophilic and soft airgel block.

[0034] The density of the prepared airgel bl...

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Abstract

The invention relates to hydrophobic lipophilic soft aerogel block and a preparation method thereof. The hydrophobic lipophilic soft aerogel block is a complex prepared from diethoxydimethylsilane and a precursor methyltriethoxysilane, and has the density of 0.056-0.072 g / cm<3> and the organic solvent adsorption rate of 1280-1430%. The preparation method comprises: mixing diethoxydimethylsilane, the precursor methyltriethoxysilane,, an alcohol solution, a surfactant and water, and then respectively adding an acid catalyst and an alkaline catalyst, so as to obtain a sol; pouring the obtained sol into an enclosed container, and standing to obtain a gel; immersing the obtained gel in the alcohol solution for aging, removing the surfactant to enhance the skeleton strength of the gel, replacing water in the gel to reduce damage to the skeleton in a drying process and further to obtain a wet gel; and putting aged wet gel in a reaction kettle for drying, so as to obtain the hydrophobic lipophilic soft aerogel block.

Description

technical field [0001] The invention relates to airgel, in particular to a hydrophobic, lipophilic and soft airgel block and a preparation method thereof. Background technique [0002] With the improvement of industrialization, petroleum has become the most important energy source in the world today, maintaining the material basis for the survival and development of human society. The demand for oil has been increasing, and oil exploration companies have begun to look at the rich oil in the ocean, but at the same time as large-scale development of offshore oil, oil spills have followed, such as the "Gulf of Mexico Oil Spill" that occurred in 2009 , and the "ConocoPhillips China Oil Spill" that occurred in Dalian, China in 2011. The fact that the oil spill has damaged the ecological balance of the ocean is obvious to all. Organic substances such as alkanes, cycloalkanes, and aromatics contained in crude oil will pollute sea water quality. The density of crude oil is lower ...

Claims

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Application Information

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IPC IPC(8): C01B33/16
Inventor 余煜玺吴晓云
Owner XIAMEN UNIV
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