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Silicon dioxide aerogel ball and preparation method thereof

A technology of silica and airgel balls, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve problems such as difficult industrial scale production, long waiting time for curing, complicated curing methods, etc., and achieve production efficiency High, simple curing effect

Active Publication Date: 2022-03-08
河北三棵树涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The droplet formation and curing efficiency directly affect the production efficiency. The above methods have the disadvantages of complicated curing methods or long curing waiting time, and it is difficult to realize industrial scale production

Method used

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  • Silicon dioxide aerogel ball and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of silica airgel balls, comprising the steps of:

[0032] 1. Configure the precursor: mix potassium methyl silicate, silica sol, hydroxypropyl methylcellulose and water according to the mass ratio of 1:0.5:0.01:4;

[0033] 2. Configure acid solution: configure an acid aqueous solution with a mass concentration of 30%;

[0034] 3. Mix the precursor prepared in step 1 with the acid aqueous solution prepared in step 2 in the pipeline mixer 1 at a mass ratio of 3:1 to form a mixed solution, and then connect the mixed solution to the pipeline mixer 1 The nozzle 2 sprays downward from the top of the solidification tower 3, and the sprayed liquid forms a spherical gel through the bottom-up wind from the air outlet pipe 4 in the solidification tower, and finally falls into the solidification tower located in the solidification tower. In the water at the bottom of the tower; the wind speed of the wind is 4m / s and the temperature is 75°C;

[0035] 4. Wash a...

Embodiment 2

[0047] A preparation method of silica airgel balls, comprising the steps of:

[0048] 1. Configure the precursor: mix potassium methyl silicate, silica sol, hydroxypropyl methylcellulose and water in a mass ratio of 1:1:0.01:4;

[0049] 2. Configure acid solution: configure an acid solution with a mass concentration of 40%;

[0050] 3. Mix the precursor prepared in step 1 with the acid aqueous solution prepared in step 2 in the pipeline mixer 1 at a mass ratio of 3:1 to form a mixed solution, and then connect the mixed solution to the pipeline mixer 1 The nozzle 2 sprays downward from the top of the solidification tower 3, and the sprayed liquid forms a spherical gel through the bottom-up wind from the air outlet pipe 4 in the solidification tower, and finally falls into the solidification tower located in the solidification tower. In the water at the bottom of the tower; the wind speed of the wind is 8m / s and the temperature is 90°C;

[0051] 4. Wash and replace the gel bal...

Embodiment 3

[0063] A preparation method of silica airgel balls, comprising the steps of:

[0064] 1. Configure the precursor: mix potassium methyl silicate, silica sol, hydroxypropyl methylcellulose and water according to the mass ratio of 1:0.8:0.01:4;

[0065] 2. Configure acid solution: configure an acid aqueous solution with a mass concentration of 20%;

[0066] 3. Mix the precursor prepared in step 1 with the aqueous acid solution prepared in step 2 in the pipeline mixer 1 at a mass ratio of 1:1 to form a mixed solution, and then connect the mixed solution to the pipeline mixer 1 The nozzle 2 sprays downward from the top of the solidification tower 3, and the sprayed liquid forms a spherical gel through the bottom-up wind from the air outlet pipe 4 in the solidification tower, and finally falls into the solidification tower located in the solidification tower. In the water at the bottom of the tower; the wind speed of the wind is 1m / s and the temperature is 60°C;

[0067] 4. Wash a...

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Abstract

The invention relates to a silicon dioxide aerogel ball and a preparation method thereof. The preparation method comprises the following steps: preparing a precursor, and preparing an acid solution; mixing the prepared precursor and the prepared acid aqueous solution in a pipeline mixer according to a mass ratio of (1-3): 1 to form a mixed solution, then spraying the mixed solution downwards from the top of a curing tower through a nozzle connected with the pipeline mixer, and forming spheroidized gel from the sprayed liquid under the action of bottom-to-top wind sprayed from an air outlet pipe in the curing tower, finally, falling into water at the bottom of the curing tower; the wind speed is 1-8 m / s, and the temperature is 60-90 DEG C; and then modifying and drying to obtain the silicon dioxide aerogel ball. According to the preparation method, a sol system is optimized, gelation time is accurately controlled, round liquid drops are formed in a free falling body mode, the round liquid drops are rapidly solidified into spherical gel by controlling countercurrent hot air of a solidification tower, and finally the spherical aerogel particles are prepared through washing, modifying and drying.

Description

technical field [0001] The invention relates to an airgel material and a preparation method thereof, in particular to a silica airgel ball and a preparation method thereof. Background technique [0002] Silica airgel is a light nanoporous amorphous solid material with a spatial network structure composed of colloidal particles or polymer molecules cross-linked with controllable structure. Its porosity is as high as 80%-99.8%, the pore size is 1-100nm, and the specific surface area is as high as 200-1000m 2 / g, the density range can reach 3~500kg / m 3 . Airgel has the characteristics of temperature resistance, heat insulation, and extremely low thermal conductivity. It is the solid material with the best heat insulation performance at present, and it shows singular characteristics in many aspects such as mechanics, acoustics, heat, and optics. Therefore, it has broad application prospects in military industry, aerospace, medical, high-speed trains, petrochemicals, building ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158
CPCC01B33/1585C01P2004/32Y02W30/91
Inventor 李文彦刘兵
Owner 河北三棵树涂料有限公司