Superhydrophobic silicon dioxide aerogel micropowder, and preparation method and application thereof

A technology of airgel micropowder and silicon oxide in water, which is applied in the direction of silicon oxide, silicon dioxide, chemical instruments and methods, etc., and can solve the problems of brittle silicon oxide airgel, difficulty in industrial production, and long preparation cycle , to achieve the effects of easy removal, saving resources and shortening the preparation cycle

Active Publication Date: 2017-11-21
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that atmospheric pressure drying requires multiple gel channel solvent exchanges and surface hydrophobic treatment, the preparation cycle is very long and the operation is cumbersome, so it is difficult to realize industrial production
On the other hand, even if the relative cost is reduced by expanding production, or a certain amount of mass production is obtained, such super thermal insulation materials are still not available in daily life, because the traditional silica airgel is brittle. , easy to crack, so it is severely limited in practical application

Method used

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  • Superhydrophobic silicon dioxide aerogel micropowder, and preparation method and application thereof
  • Superhydrophobic silicon dioxide aerogel micropowder, and preparation method and application thereof
  • Superhydrophobic silicon dioxide aerogel micropowder, and preparation method and application thereof

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preparation example Construction

[0032] The embodiment of the present invention provides a preparation method of superhydrophobic silica airgel micropowder, comprising:

[0033] Mix the silicon source, low surface tension organic solvent, hydrophobic modifier and alkali catalyst to form a mixed solution, and let it stand to form a silica organogel, and then age;

[0034] The obtained silica organogel is pulverized and then directly dried under normal pressure to obtain superhydrophobic silica airgel micropowder.

[0035] As one of the preferred embodiments, the mixed solution includes: 0.01-20 parts by volume of silicon source, 10-70 parts by volume of low surface tension organic solvent, 0.1-10 parts by volume of hydrophobic modifier and 0.001-0.05 parts by volume of alkali catalyst.

[0036] As one of the preferred solutions, the drying temperature is 25-250° C., and the drying method includes blast drying, spray drying or rotary drying.

[0037] Preferably, the silicon source includes polysiloxane and po...

Embodiment 1

[0062] (1) Synthesis of silica organogel: get 10 parts of polysiloxane, 20 parts of n-hexane, and 2 parts of hexamethyldisilazane and mix them evenly in a stirring tank, drop 10 microliters of ammonia water under stirring, and stir The speed is 50rpm, after stirring for 15 minutes, the mixture is allowed to stand still to form a white opaque organic gel.

[0063] (2) Drying of wet gel: Dry the silica organogel obtained above at 100°C, and obtain superhydrophobic silica airgel micropowder after 60 minutes. Characterized by BET isothermal adsorption, it can be found that the superhydrophobic oxidation Silica airgel powder has a nanoporous structure. For the isotherm adsorption-desorption curve of this silica airgel powder, please refer to Figure 1a , SEM image see Figure 2a , and other physical parameters such as specific surface area, pore size, density, contact angle, etc. are shown in Table 1.

[0064] (3) Take 100 mg of the obtained airgel micropowder and place it on a pa...

Embodiment 2

[0066] (1) Synthesis of silica organogel: Take 10 parts of polysiloxane, 2 parts of n-hexane, and 1 part of dimethyldimethoxysilane in a stirring tank, mix them evenly, and drop 100 microliters of 0.5M NaOH solution, the stirring speed is 50rpm, after stirring for 1 minute, stand still to form a white opaque organic gel.

[0067] (2) Drying of the wet gel: dry the silica organogel at 150°C, and obtain superhydrophobic silica airgel micropowder after 60 minutes. Characterized by BET isothermal adsorption, it can be found that the superhydrophobic airgel micropowder With nanoporous structure, please refer to the isothermal adsorption-desorption curve of this silica airgel powder Figure 1b , SEM image see Figure 2b , and other physical parameters such as specific surface area, pore size, density, contact angle, etc. are shown in Table 1.

[0068] (3) Get 50 mg of the gained airgel micropowder, place it on a plastic film (PET), and then use a smooth metal plate to evenly coat ...

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Abstract

The invention discloses superhydrophobic silicon dioxide aerogel micropowder, and a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixing a silicon source, a low-surface-tension organic solvent, a hydrophobic modifier and an alkali catalyst to form a mixed solution, performing standing to form a silicon dioxide organogel, and performing aging; and pulverizing the obtained silicon dioxide organogel, and performing drying under normal pressure conditions to obtain the superhydrophobic silicon dioxide aerogel micropowder. The superhydrophobic silicon dioxide aerogel micropowder has a porous structure; the pore size of pores in the porous structure is 1-50nm; and the specific surface area of the superhydrophobic silicon dioxide aerogel micropowder is 500-1000 m<2> / g, the pore volume is 0.5-3 cm<3> / g, the contact angle with water is greater than 140 degrees, and the particle size is 500nm-50 mu m. The method does not need any solvent for replacement, has the advantages of simple technique, short production cycle and low cost, implements continuous quick production of the silicon dioxide aerogel micropowder, and implements the application of the aerogel micropowder in the fields of oil-water separation, superhydrophobic modification of object surfaces and the like.

Description

technical field [0001] The invention relates to a silica airgel, in particular to a superhydrophobic silica airgel micropowder with a nanoporous structure prepared by normal pressure drying technology, a preparation method and an application thereof, belonging to the technical field of nanoporous materials. Background technique [0002] Airgel is a highly porous nano-material, which is currently the lightest solid material with the best thermal insulation performance in the world. Since silica airgel has a high specific surface area (400-1500m 2 / g), high porosity (80-99.8%), low density (0.003-0.6g / cm 3 ) and low thermal conductivity (0.013~0.038W / mk), which make silica aerogels have great potential in the fields of high temperature resistance, heat insulation, ultra-low density, acoustic impedance coupling, gas adsorption and filtration, catalyst carrier, drug carrier, etc. Very broad application prospects. [0003] At present, the usual method for preparing silica airg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16C02F1/28B01D17/022C02F101/32C02F101/34
CPCB01D17/0202C01B33/163C01P2004/03C01P2004/61C01P2004/62C01P2006/10C01P2006/12C01P2006/14C01P2006/16C02F1/281C02F2101/32C02F2101/34
Inventor 张学同王锦
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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