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Super-hydrophobic organic silicon aerogel as well as normal-temperature and normal-pressure drying preparation method and application thereof

An atmospheric drying and super-hydrophobic technology, applied in separation methods, chemical instruments and methods, liquid separation, etc., can solve the problems that airgel does not have hydrophobic function, the cost of preparation process is high, and needs further improvement, etc., to achieve Good for large-area preparation, excellent superhydrophobic and lipophilic properties, and excellent compression recovery

Active Publication Date: 2020-06-09
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent publication CN 110157034 A discloses a method for preparing a highly hydrophobic airgel porous material, that is, using nanocellulose to stabilize the Pickering emulsion gel containing polymers combined with freeze-drying technology to obtain nanocellulose / polymer composite airgel glue, and then use a simple chemical grafting method to graft polymethylhydrogensiloxane (PMHS) into the nanocellulose / polymer composite airgel structure to obtain a highly hydrophobic airgel porous material; China Patent publication CN 107057107 A discloses a method for preparing cellulose airgel by freeze-drying; Chinese patent publication CN 107151020 A discloses a method for preparing silica airgel composite material by freeze-drying, but its preparation process Costs remain high
The airgel prepared by this method has no hydrophobic function, and it is soluble in moisture absorption during use, which affects its practical application
Chinese published patent text CN 108529634 A discloses a method of drying organic silicon elastic airgel under normal pressure, which uses nanoparticles as functional factors to construct a hydrophobic surface structure, and the highest water contact angle of the airgel prepared by this patent is only 154.9 °, there is still room for further improvement

Method used

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  • Super-hydrophobic organic silicon aerogel as well as normal-temperature and normal-pressure drying preparation method and application thereof
  • Super-hydrophobic organic silicon aerogel as well as normal-temperature and normal-pressure drying preparation method and application thereof
  • Super-hydrophobic organic silicon aerogel as well as normal-temperature and normal-pressure drying preparation method and application thereof

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preparation example Construction

[0045] The process flow of the normal temperature and pressure drying preparation method of the superhydrophobic organosilicon aerogel of the present invention is as follows figure 1 shown, including steps:

[0046] (1) After mixing hydrogen-containing silicone oil, component A and catalyst, heat at 40-70°C to obtain a gel precursor; the component A is vinylalkoxysilane and / or propenylalkoxysilane;

[0047] (2) Adding an organic solvent (such as benzyl alcohol), water and an alkali catalyst to the gel precursor, stirring evenly, and keeping it warm at 70-90° C. to obtain a wet gel;

[0048] (3) Wash the wet gel with a washing solvent to remove the original solvent and unreacted molecules, then wash the wet gel again with a low surface energy solvent, and finally dry at normal temperature and pressure to obtain the superhydrophobic silicone airgel.

Embodiment 1

[0050] (1) Add 2.6g of hydrogen-containing silicone oil with a hydrogen content of 0.75wt%, 3.1g of vinylmethyldimethoxysilane and 0.2g of catalyst into the container and stir evenly, and put it in an oven at 50°C for 20min to allow the reaction fully carried out.

[0051] (2) Cool the reactant obtained in step (1) to room temperature, add 1.2g of water, 60g of benzyl alcohol and 0.2g of tetramethylammonium hydroxide, stir well and put it into an oven at 80°C for gel aging for 2 days.

[0052] (3) Replace the gel obtained in step (2) in isopropanol solvent for 3 times, each time for 8 hours, to replace unreacted molecules, and then replace it with n-hexane solvent for 3 times, each time for 8 hours, after the replacement is completed The superhydrophobic silicone airgel can be obtained by drying at normal temperature and pressure.

[0053] The density of the superhydrophobic silicone airgel obtained in Example 1 is 78 mg cm -3

[0054] figure 2 It is a photo of the airgel...

Embodiment 2

[0060] (1) Add 2.0g of hydrogen-containing silicone oil with a hydrogen content of 1.0wt%, 3.1g of vinylmethyldimethoxysilane and 0.2g of catalyst into the container and stir evenly, and put it in an oven at 50°C for 20min to allow the reaction fully carried out.

[0061] (2) Cool the reactant obtained in step (1) to room temperature, add 1.2g of water, 60g of benzyl alcohol and 0.3g of tetramethylammonium hydroxide, stir well, and put it into an oven at 80°C for gel aging for 2 days.

[0062] (3) See step (3) in Example 1.

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Abstract

The invention discloses a normal-temperature and normal-pressure drying preparation method of super-hydrophobic organic silicon aerogel. The method comprises the following steps: (1) mixing hydrogen-containing silicone oil, a component A and a catalyst, and keeping the temperature at 40-70 DEG C to obtain a gel precursor; wherein the component A is vinyl alkoxy silane and / or allyl alkoxy silane; (2) adding an organic solvent, water and an alkali catalyst into the gel precursor, uniformly stirring, and keeping the temperature at 70-90 DEG C to obtain wet gel; and (3) washing the wet gel by using a washing solvent, removing the original solvent and unreacted molecules, then washing the wet gel again by using a low-surface-energy solvent, and finally drying at normal temperature and normal pressure to obtain the super-hydrophobic organic silicon aerogel. The invention also discloses the super-hydrophobic organic silicon aerogel prepared by the preparation method and an application of thesuper-hydrophobic organic silicon aerogel in oil-water separation. The preparation method is simple, high in operability and low in energy consumption, and the obtained aerogel has excellent super-hydrophobic oleophylic performance, low density, excellent compression resilience and the like.

Description

technical field [0001] The invention relates to the technical field of organosilicon airgel, in particular to a superhydrophobic organosilicon airgel, its preparation method by drying at normal temperature and pressure, and its application in oil-water separation. Background technique [0002] Aerogels have a three-dimensional interconnected open-pore structure composed of ultrafine nanoparticles, and are usually prepared by sol-gel methods to obtain hydrogels or alcogels, followed by specific drying processes to Instead of liquid solvents, without destroying its fine nanostructure, it is a solid material with low density, high specific surface area and high porosity, and has very good heat insulation performance, high and low temperature resistance and excellent adsorption performance. It is widely used in construction industry, petroleum industry, transportation, environmental cleaning and protection, aerospace, national defense and other fields. However, the preparation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L83/10C08G77/44B01D17/022
CPCC08J9/286C08G77/44B01D17/0202C08J2383/10C08J2205/026C08J2201/0502
Inventor 汤龙程郭坤雨张国栋张朝辉张建旺
Owner HANGZHOU NORMAL UNIVERSITY
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