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Hydrophobic aerogel powder and rapid preparation method thereof

A hydrophobic airgel and powder technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of low specific surface area, large equipment dependence, large pore structure size, etc., and achieve high specific surface area , avoid the use of organic solvents, and reduce the production cycle

Inactive Publication Date: 2020-12-25
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the drying needs to be replaced with ethanol by solvent and then supercritically dried. The preparation cycle is long and the equipment dependence is large.
However, the aerogel prepared with methyltrimethoxysilane as a precursor and alcohol as a solvent has large pore structure size due to microscopic phase separation, limited nanopore structure, and low specific surface area. Solvent replacement step is performed, which affects the production cycle

Method used

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  • Hydrophobic aerogel powder and rapid preparation method thereof
  • Hydrophobic aerogel powder and rapid preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 120 parts by mass of solvent water, add 0.1 parts by mass of acetic acid, then add 2.0 parts by mass of surfactant cetyltrimethylammonium chloride, stir well and add 100 parts by mass of precursor methyl trimethoxy base silane was stirred for hydrolysis.

[0028] The hydrolysis temperature is 25°C, and the hydrolysis time is 20 minutes.

[0029] After hydrolysis, 0.003 parts by mass of ammonium fluoride was added and stirred at a temperature of 20° C., and then polymerized.

[0030] The wet gel obtained by polymerization is subjected to pulverization treatment at a temperature of 25°C.

[0031] The wet gel powder is subjected to water washing treatment, the water washing temperature is 50°C, and the water washing time is 20 minutes.

[0032] The wet gel powder after water washing is directly dried under normal pressure at a drying temperature of 40° C. to obtain a hydrophobic airgel powder.

[0033] The resulting airgel powder appearance picture is as follows ...

Embodiment 2

[0035] Weigh 100 mass parts of solvent water, add 0 mass parts of acetic acid, then add 1.5 mass parts of surfactant cetyltrimethylammonium chloride, stir well and add 80 mass parts of precursor methyl trimethoxy base silane was stirred for hydrolysis.

[0036] The hydrolysis temperature is 10°C, and the hydrolysis time is 10 minutes.

[0037] After hydrolysis, 0.001 parts by mass of ammonium fluoride was added and stirred at a temperature of 40° C., and then polymerized.

[0038] The wet gel obtained by polymerization is subjected to pulverization treatment at a temperature of 10°C.

[0039] The wet gel powder was washed with water, the washing temperature was 20°C, and the washing time was 30 minutes.

[0040] The wet gel powder after water washing is directly dried under normal pressure at a drying temperature of 80° C. to obtain a hydrophobic airgel powder.

Embodiment 3

[0042] Weigh 140 parts by mass of solvent water, add 0.2 parts by mass of acetic acid, then add 2.5 parts by mass of surfactant cetyltrimethylammonium chloride, stir well and add 110 parts by mass of precursor methyl trimethoxy base silane was stirred for hydrolysis.

[0043] The hydrolysis temperature is 60°C, and the hydrolysis time is 30 minutes.

[0044] After hydrolysis, 0.004 parts by mass of ammonium fluoride was added and stirred at a temperature of 60° C., and then polymerized.

[0045] The wet gel obtained by polymerization is subjected to pulverization treatment at a temperature of 50°C.

[0046] The wet gel powder was washed with water at a temperature of 70° C. for 10 minutes.

[0047] The wet gel powder after water washing is directly dried under normal pressure at a drying temperature of 100° C. to obtain a hydrophobic airgel powder.

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Abstract

The invention provides hydrophobic aerogel powder and a rapid preparation method thereof, and belongs to the technical field of nano-porous materials. The aerogel powder is rapidly prepared from methyltrimethoxysilane used as a precursor, water used as a solvent and a surfactant through sol-gel and normal-pressure drying. The aerogel is rapidly prepared by enhancing the strength of a gel skeleton,performing in-situ modification on the surfaces of the nanoparticles and the like, then the aerogel powder is rapidly obtained by pulverization and direct normal-pressure drying, the preparation period is short, and the application of the aerogel in the fields of heat insulation, adsorption separation and the like is facilitated.

Description

technical field [0001] The invention relates to a hydrophobic airgel powder and a rapid preparation method thereof, belonging to the technical field of nanoporous materials. Background technique [0002] As a typical nanoporous material, airgel is widely used in the fields of heat insulation, gas adsorption and oil-water separation due to its unique nano-network structure, low specific surface area, low thermal conductivity, and high adsorption properties. focus on. However, due to the drying methods such as supercritical drying or atmospheric drying with complicated and lengthy processes, the preparation efficiency of aerogels is low, which seriously limits its promotion in practical applications. [0003] Using methyltrimethoxysilane as a single precursor, Professor Kanamori of Kyoto University in Japan prepared an organic-inorganic hybrid silica airgel through a surfactant-water system. However, the drying needs to be replaced with ethanol by solvent and then supercriti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158C01B33/155
CPCC01B33/155C01B33/1585
Inventor 雷朝帅李文静杨洁颖黄红岩张恩爽刘圆圆张昊赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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