A kind of superhydrophobic silicon oxide airgel micropowder, preparation method and application thereof

A technology of aerogel micropowder and water silicon oxide, which is applied in the field of preparation, silica aerogel, and superhydrophobic silica aerogel micropowder, can solve the problem that silica aerogel is brittle and difficult to industrialized production and preparation. Long cycle and other problems, to achieve the effect of easy removal, saving resources, and shortening the preparation cycle

Active Publication Date: 2020-03-27
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • 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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  • A kind of superhydrophobic silicon oxide airgel micropowder, preparation method and application thereof
  • A kind of superhydrophobic silicon oxide airgel micropowder, preparation method and application thereof
  • A kind of superhydrophobic silicon oxide airgel micropowder, 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 a superhydrophobic silicon oxide airgel micropowder, a preparation method and an application thereof. The preparation method comprises: uniformly mixing a silicon source, a low surface tension organic solvent, a hydrophobic modifier and an alkali catalyst to form a mixed solution, standing to form a silica organogel, and then aging; and then making the obtained silica organogel Pulverize and then dry under normal pressure to obtain superhydrophobic silicon oxide airgel micropowder. The superhydrophobic silica airgel micropowder has a porous structure, the pore diameter of the pores in the porous structure is 1-50nm, and the specific surface area of ​​the superhydrophobic silica airgel micropowder is 500-1000m 2 / g, the pore volume is 0.5~3cm 3 / g, the contact angle with water is greater than 140°, and the particle size is 500nm to 50µm. The invention does not require any solvent replacement, has simple process, extremely short production cycle, and low cost, not only realizes the continuous and rapid production of silica airgel micropowder, but also realizes the separation of airgel micropowder from water and superhydrophobic modification of the surface of objects applications in other fields.

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 Patents(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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