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Reusable low-cost silica aerogel oil-absorbing sponge and preparation method thereof

A silicon aerogel, oil-absorbing sponge technology, applied in separation methods, chemical instruments and methods, liquid separation, etc., can solve the problems of low elasticity and strength of silicon aerogel, complicated and tedious operating conditions, and high environmental toxicity of raw materials, etc. Achieve the effect of shortening the production cycle, simple preparation tools, and good emergency response performance

Active Publication Date: 2013-10-02
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, there are the following technical problems in the existing technology for preparing low-cost elastic, lipophilic and hydrophobic silicon airgel oil-absorbing sponges: (1) relying on supercritical drying technology, the operating conditions are complex and cumbersome; (2) the environmental toxicity of raw materials is relatively large, and the preparation cycle relatively long; (3) the elasticity and strength of silicon airgel are relatively low; (4) the cost of preparation materials is relatively high

Method used

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  • Reusable low-cost silica aerogel oil-absorbing sponge and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In a 100mL round-bottomed flask equipped with a magnetic stirring bar, add 2g of cetyltrimethylammonium chloride and 50mL of dilute acetic acid solution, and under vigorous stirring conditions, add 9mL of methyltrimethoxysilane and 5mL of dimethyl Dimethoxysilane. After reacting for 0.5h, add 5g of urea and continue stirring for 1h. The obtained airsilica precursor was transferred to an oven at 60°C, and kept for 6 hours. The obtained gel was washed 3 times by physical extrusion with 30 mL of methanol, and then dried at room temperature and normal pressure ventilation.

Embodiment 2

[0038] In a 100mL round bottom flask equipped with a magnetic stirring bar, add 2g of sodium dodecylbenzenesulfonate and 50mL of dilute acetic acid solution, and under vigorous stirring conditions, add 9mL of methyltrimethoxysilane and 8mL of dimethyldimethoxysilane in sequence Methoxysilane. After reacting for 0.5h, add 5g of urea and continue stirring for 1h. The obtained airsilica precursor was transferred to an oven at 60°C, and kept for 6 hours. The obtained gel was washed 3 times by physical extrusion with 30 mL of methanol, and then dried at room temperature and normal pressure ventilation.

Embodiment 3

[0040] In a 100mL round-bottomed flask equipped with a magnetic stirring bar, add 2g of cetyltrimethylammonium chloride and 50mL of dilute acetic acid solution, and under vigorous stirring conditions, add 9mL of methyltriethoxysilane and 5mL of diacetate Methyldiethoxysilane. After reacting for 0.5h, add 5g of urea and continue stirring for 1h. The obtained airsilica precursor was transferred to an oven at 60°C, and kept for 6 hours. The obtained gel was washed by physical extrusion with ethanol, and then dried in a ventilated place at room temperature and normal pressure.

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Abstract

The invention discloses a reusable low-cost silica aerogel oil-absorbing sponge material and a preparation method thereof, belongs to the technical field of environment. The method disclosed by the invention comprises the following steps: synthesizing a silica aerogel precursor from functional group substituted alkoxy silane used as a raw material under the action of surfactant; and under the condition of drying at room temperature and normal pressure, preparing the elastic lipophilic hydrophobic silica aerogel oil-absorbing sponge, The silica aerogel material prepared by the method has low density, satisfactory elasticity, stable performance and favorable lipophilicity and hydrophobicity, and is reusable; and compared with the common silica aerogel, the reusable low-cost silica aerogel oil-absorbing sponge is wider in applicable temperature range, more convenient in manufacturing process, lower in cost and more stable in quality.

Description

Technical field: [0001] The invention relates to a method for preparing an oil-absorbing material, in particular to a method for preparing a reusable silicon airgel oil-absorbing sponge with low cost and excellent elasticity. Background technique: [0002] Airgel is a nanoporous network structure composed of nanoscale ultrafine particles aggregated with each other, and a light, porous, amorphous solid material filled with air in the network voids. The particle size is between 1-100nm. It is a typical nano material with a porosity as high as 99% and a density as low as 1kg / m 3 , the specific surface area is 1000m 2 / g or more. The excellent properties of airgel make it widely used in heat insulation, sound insulation, environmental protection, catalysis and so on. [0003] The preparation of silicon airgel generally uses organosilicon precursors (methyl orthosilicate, ethyl orthosilicate, etc.) or water glass as raw materials, and uses the sol-gel method to form a dendriti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L83/04C08G77/06B01D17/022
Inventor 卞兆勇王辉边宇丁爱中
Owner BEIJING NORMAL UNIVERSITY
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