Organic modified nanoporous silica aerogel and preparation method thereof

A silicon dioxide and nanopore technology, applied in the directions of silicon dioxide, silicon oxide, etc., can solve the problems of complicated preparation process, long time consumption, increase preparation cost, etc., and achieve good mechanical properties, reduced preparation cost, and low-cost preparation method. Effect

Inactive Publication Date: 2015-04-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this modification method takes a long time, the preparation process is more complicated, and the more expensive CO 2 Supercritical drying method, which increases the cost of preparation

Method used

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  • Organic modified nanoporous silica aerogel and preparation method thereof
  • Organic modified nanoporous silica aerogel and preparation method thereof
  • Organic modified nanoporous silica aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0032] Mix 3-aminopropyltrimethoxysilane, terephthalaldehyde, 0.2M hydrochloric acid solution and absolute ethanol at a molar ratio of 1:0.33:20:0.4, stir at room temperature for 20min to mix evenly, and seal the above solution Store and incubate at 40°C for 12h to form a gel. Then, the excess ethanol / water mixture was removed from the obtained gel, soaked in an appropriate amount of absolute ethanol, and kept at 40° C. for 24 hours to remove residual chemical substances. Repeat this 2 times. Then the temperature was raised to 80°C (1°C / min), and dried under normal pressure for 36h to obtain the organic composite modified nanoporous SiO 2 airgel.

Embodiment example 2

[0034] Mix 3-aminopropyldimethylethoxysilane, terephthalaldehyde, 0.4M hydrochloric acid and absolute ethanol in a molar ratio of 1:1:15:0.4, stir at room temperature for 20min and mix evenly, and the above solution Store in an airtight container and incubate at 40°C for 12 hours to form a gel. Then, the excess ethanol / water mixture was removed from the obtained gel, soaked in an appropriate amount of absolute ethanol, and kept at 40° C. for 24 hours to remove residual chemical substances. Repeat this 2 times. Then the temperature was raised to 60°C (2.5°C / min), and dried under normal pressure for 36 hours to obtain organic composite modified nanoporous SiO2 airgel.

Embodiment example 3

[0036] 3-aminopropyltrimethoxysilane, 4,4 ’ - Mix biphenyldiformaldehyde, 0.4M hydrochloric acid solution and absolute ethanol at a molar ratio of 1:0.8:17:0.5, stir at room temperature for 20 minutes to mix evenly, seal and store the above solution, and keep it at 40°C for 12 hours to form a gel . Then, the excess ethanol / water mixture was removed from the obtained gel, soaked in an appropriate amount of absolute ethanol, and kept at 40° C. for 24 hours to remove residual chemical substances. Repeat this 2 times. Then the temperature was raised to 120°C (5°C / min), and dried under normal pressure for 36h to obtain the organic composite modified nanoporous SiO 2 airgel.

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Abstract

The invention discloses organic modified nanoporous silica aerogel and a preparation method thereof. The preparation method comprises the following specific steps: by using amino-containing siloxane as a starting silicon source and only using ethanol as a solvent, performing function compounding and chemical modification through an aldehyde group-containing organic function body, improving the intensity of an aerogel network, obtaining wet gel with hydrophobic properties, and finally performing atmospheric drying, thereby obtaining the modified nanoporous silica aerogel with good mechanical properties. The organic modified nanoporous silica aerogel provided by the invention has the advantages of simple preparation method and process, short flow, atmospheric drying technology, and great reduction in preparation cost of aerogel, and is favorable for realizing large-scale production and promoting the actual application.

Description

technical field [0001] The invention relates to a preparation method of nanoporous silica airgel, specifically a composite precursor obtained by reacting amino-containing siloxane and an organic functional body containing aldehyde group as a silicon source, through hydrolysis A wet gel is prepared, and finally the prepared organic composite modified nanoporous silica airgel is dried under normal pressure. Background technique [0002] Nanoporous material SiO 2 Airgel is a new type of porous amorphous material with low density, low thermal conductivity and high porosity. It has unique thermal, acoustic, optical and electrical properties, and has a wide range of applications in many fields such as thermal insulation, sound insulation, and adsorption. However, due to its low density and high porosity, its mechanical properties are poor (compressive strength is generally less than 5MPa), it is greatly restricted in engineering applications, and its actual use is limited to spec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16
Inventor 王戈金召奎高鸿毅陈当家栾奕彭雄钱伟
Owner UNIV OF SCI & TECH BEIJING
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