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Aerogel micro powder and preparation method thereof

An airgel and gel technology, applied in the direction of airgel preparation, chemical instruments and methods, colloid chemistry, etc., to achieve the effects of reduced energy consumption, low density, and continuous production

Inactive Publication Date: 2018-10-23
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Table 1. Comparison of advantages and disadvantages of four drying methods

Method used

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  • Aerogel micro powder and preparation method thereof
  • Aerogel micro powder and preparation method thereof

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preparation example Construction

[0036] An aspect of the embodiments of the present invention provides a method for preparing aerogel powder, which includes:

[0037] Provide a hydrogel, crush the hydrogel, and then disperse it in water to form a gel fluid or gel dispersion;

[0038] Using an atomizing device to atomize the gel fluid or gel dispersion to form gel droplets, and collect the gel droplets in a low-temperature container to obtain gel frozen particles;

[0039] The frozen gel particles are freeze-dried to obtain aerogel powder.

[0040] As one of the preferred embodiments, the hydrogel includes any of non-metal oxide hydrogels, metal oxide hydrogels, carbon-based hydrogels, polymer hydrogels and composite hydrogels One or a combination of two or more, but not limited to this. These hydrogels can be obtained commercially, or can be prepared in a suitable manner known in the industry. For example, you can refer to the literature: Functional Materials, 2009, 1(40): 151-153, Journal of Non-Crystalline Solids2...

Embodiment 1

[0170] (1) Preparation of silica hydrogel: mix 1 mole of water glass (wherein the content of silica is 26-28% by weight) and deionized water in a volume ratio of 1:2, then add 0.4 mole of water Dilute acid solution (10 -3 mol / L), stir evenly and let it stand overnight. After the gel is formed, it is then aged for 24 hours and replaced with deionized water 4 times to obtain the silica hydrogel.

[0171] (2) Atomizing the silica hydrogel: crushing the silica hydrogel in step (1) with strong mechanical stirring to obtain a silica hydrogel fluid for use. The silica hydrogel fluid was injected into the nozzle of the atomizer at a rate of 30 mL / h, and the droplets with a particle size of about 20 μm were obtained after atomization. The mist droplets are sprayed into the low-temperature container, and the temperature of the low-temperature container is as low as -60°C. After the mist droplets fall, they will freeze and freeze rapidly to obtain frozen particles.

[0172] (3) Freeze drying...

Embodiment 2

[0176] (1) Preparation of graphene hydrogel: Disperse graphene oxide in deionized water by ultrasound, centrifuge at 1500r / min for 40min, collect the supernatant, and then centrifuge the supernatant at 8000r / min for 4h for concentration , Collect the lower dispersion system to obtain a graphene oxide aqueous solution with a concentration of 8 mg / mL, and then add 1% vitamin C to reduce to obtain graphene hydrogel.

[0177] (2) Atomizing the graphene hydrogel: After breaking the above-mentioned gel, it is injected into the nozzle of the atomizer at a rate of 30 mL / h, and atomized to obtain droplets with a particle size of about 80 μm. The mist droplets are sprayed into the low-temperature container, and the temperature of the low-temperature container is as low as -80°C. After the droplets fall, they will freeze and freeze quickly to obtain frozen particles.

[0178] (3) Freeze drying graphene hydrogel frozen particles: the collected graphene hydrogel frozen particles are quickly tra...

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Abstract

The invention discloses aerogel micro powder and a preparation method thereof. The method comprises the following steps: a hydrogel is provided, and fragmentation is carried out on the hydrogel and dispersing the hydrogel to obtain gel fluid or gel dispersion liquid; an atomizing device is employed for performing atomization on the gel fluid or the gel dispersion liquid, gel droplets are formed, the gel droplets are collected by a low-temperature container, and the gel freezing particles are obtained; the freeze drying is carried out, and the aerogel micro powder is obtained. The aerogel micropowder can realize integration of granulation and refrigeration, pre-refrigeration is not required, rapid and continuous production of the aerogel micro powder can be realized, organic solvent displacement is not required, the preparation method has the advantages of simple process, short production period, low cost, energy saving, and environmental protection, the preparation process can be amplified to industrial production, and the obtained aerogel micro powder has the excellent physical properties of controllable morphology, uniform particle size, large specific surface area, high porosity amount, and low thermal conductivity.

Description

Technical field [0001] The invention relates to an aerogel powder, in particular to an aerogel powder and a preparation method thereof, and belongs to the technical field of nanoporous materials. Background technique [0002] Aerogel is a highly porous nanomaterial with excellent characteristics such as low density, high porosity, high specific surface area and low thermal conductivity. In particular, the low thermal conductivity of aerogel makes it good for thermal insulation Performance has great application value in the energy field, but it is very difficult to transform wet gel into aerogel. [0003] Currently, there are three common drying methods for preparing aerogels: supercritical drying, freeze drying, and atmospheric drying. For example, the literature (Nature, 1931, 127:741.). It was first proposed to use gas to replace the liquid in the wet gel. Since then, the supercritical drying method of replacing the organic solvent in the wet gel with the supercritical fluid ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158C01G49/06B01J13/00
CPCB01J13/0091C01B33/1585C01G49/06C01P2002/82C01P2004/03Y02P20/10
Inventor 张学同吴晓涵
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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