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A kind of preparation method with flexible silica airgel

A silicon dioxide and aerogel technology, applied in the directions of silicon dioxide, silicon oxide, etc., can solve the problems of unsuitable for large-scale popularization, high price, complicated process, etc., and achieve low price, easily available raw materials and simple process. Effect

Active Publication Date: 2018-05-08
广州凌玮科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of the above methods use organosilane materials as raw materials, which are expensive, and both require supercritical drying to achieve drying. The process is complicated and the cost is high, and they are not suitable for large-scale promotion and use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Regenerate and clean the strongly acidic cation exchange resin, prepare a 3% sodium silicate solution, and pass through the outlet of the ion exchange column at a speed of 300mL / h to maintain a pH value of 2.5 to obtain a silica precursor. Take 1000Kg of the silica precursor , into the mixing tank, add a saturated melamine solution containing 3 g of melamine, and mix for 20 minutes. Add ammonia water to adjust the pH value to 8-9, stir at room temperature for 20 minutes, pour into a molding mold, keep warm at 50-60°C until gel and age for 15 hours to form a gel. Wash the gel with ethanol at 10°C to replace the water content in the gel below 0.1%. Then use nitrogen gas at a temperature of 120-150° C. to dry to prepare a flexible silicon dioxide aerogel.

Embodiment 2

[0020] Regenerate and clean the strongly acidic cation exchange resin, prepare 5% sodium silicate solution, and pass through the outlet of the ion exchange column at a speed of 400mL / h to maintain a pH value of 2.5 to obtain a silica precursor. Take 1000Kg of the silica precursor , into the mixing tank, add saturated melamine solution containing 5g of melamine, and mix for 20 minutes. Add ammonia water to adjust the pH value to 8-9, stir at room temperature for 20 minutes, pour into a molding mold, keep warm at 50-60°C until gel and age for 20 hours to form a gel. Wash the gel with methanol at 12°C to replace the water content in the gel to below 0.1%. Then use nitrogen gas at a temperature of 120-150° C. to dry to prepare a flexible silicon dioxide aerogel.

Embodiment 3

[0022] Regenerate and clean the strongly acidic cation exchange resin, prepare a 5% sodium silicate solution, and pass through the outlet of the ion exchange column at a speed of 500mL / h to maintain a pH value of 3.0 to obtain a silica precursor. Take 1000Kg of the silica precursor , into the mixing tank, add saturated melamine solution containing 7.5g of melamine, and mix for 25 minutes. Add ammonia water to adjust the pH value to 8-9, stir at room temperature for 20 minutes, pour into a molding mold, keep warm at 50-60°C until gel and age for 15 hours to form a gel. Wash the gel with alcohol at 15°C with acetone to replace the water content in the gel below 0.1%. Then use nitrogen gas at a temperature of 120-150° C. to dry to prepare a flexible silicon dioxide aerogel.

[0023] Table 1 shows the physical performance tests of the silica airgel prepared in the above examples.

[0024] Test items

Index value

Embodiment one

Embodiment two

Embodiment Th...

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Abstract

The invention relates to a preparation method of a silica aerogel having flexibility, wherein an alkali silicate is adopted as a raw material, a silica gel precursor is prepared through a cationic exchange resin, melamine is added, aging is performed under an alkaline condition, water is replaced with an alcohol or ketone substance, and drying is performed to prepare the silica aerogel having flexibility. According to the present invention, the sodium silicate is adopted as the raw material to replace the existing organosilane raw material, such that the raw material is easy to obtain and the price is cheap; and the process is simple, the method is easy to industrialize, and the re-processibility is provided.

Description

technical field [0001] The invention relates to the field of airgel preparation, in particular to a preparation method of flexible silica airgel. Background technique [0002] Airgel is a light, porous solid material with a particle size between 1-100nm. It is a typical nanomaterial, and its porosity can reach 80-99.8%. Due to the specific porous nano-network structure of airgel, it has incomparable excellent performance of other solid materials, and its density can reach as low as 3kg / m 3 , the specific surface area can reach 1000m 2 Above / g, the thermal conductivity is extremely low, and the vacuum thermal conductivity at room temperature can even reach 0.001wm-1·K-1. These excellent properties of airgel make it have a very wide range of uses. [0003] At present, there are two main methods for the preparation of flexible silica airgel: (1) silane is used as a precursor, alcohol is used as a solvent, and acid and alkali solutions are used as catalysts respectively. Aft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/16
Inventor 胡颖妮胡湘仲胡伟民
Owner 广州凌玮科技股份有限公司