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Method for preparing reinforced aerogel

An aerogel and strong technology, which is used in the field of preparing strong aerogels, can solve problems such as cracking and large shrinkage, and achieve the effect of strengthening the gel skeleton, enhancing the strength and realizing the strengthening.

Active Publication Date: 2021-01-22
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a strengthened airgel, through aging treatment, to overcome the defects of large shrinkage and cracking in the normal pressure drying process in the prior art

Method used

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  • Method for preparing reinforced aerogel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 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.

[0023] The hydrolysis temperature is 20° C., and the hydrolysis time is 1 hour.

[0024] After hydrolysis, 0.003 parts by mass of ammonium fluoride was added and stirred at a temperature of 20° C., and then polymerized.

[0025] The polymerized hydrogel is subjected to aging treatment, the concentration of ammonium fluoride in the aging solution is 0.5M, and the volume ratio of the aging solution to the gel is 3:1;

[0026] The aging temperature is 90° C., and the aging time is 72 hours.

[0027] Dry the aged hydrogel under normal pressure. The drying process is 30°C for 3 hours, 60°C for 3 hours, 90°C for 3 hours, and 120°C for 3 hours to obtain high-strength airgel.

Embodiment 2

[0029] 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 90 mass parts of precursor methyl trimethoxy base silane was stirred for hydrolysis.

[0030] The hydrolysis temperature is 10°C, and the hydrolysis time is 24 hours.

[0031] After hydrolysis, 0.001 parts by mass of ammonium fluoride was added and stirred at a temperature of 20° C., and then polymerized.

[0032] The polymerized hydrogel was subjected to aging treatment, the concentration of ammonium fluoride in the aging solution was 0.1M, and the volume ratio of the aging solution to the gel was 5:1.

[0033] The aging temperature is 80° C., and the aging time is 96 hours.

[0034] The aged hydrogel was dried under normal pressure. The drying process was 2 hours at 30°C, 2 hours at 60°C, 2 hours at 90°C, and 2 hours at 120°C.

Embodiment 3

[0036] Weigh 130 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.

[0037] The hydrolysis temperature is 30° C., and the hydrolysis time is 0.5 hour.

[0038] After hydrolysis, 0.004 parts by mass of ammonium fluoride was added and stirred at a temperature of 20° C., and then polymerized.

[0039] The polymerized hydrogel was subjected to aging treatment, the concentration of ammonium fluoride in the aging solution was 1.5M, and the volume ratio of the aging solution to the gel was 10:1.

[0040] The aging temperature is 120° C., and the aging time is 24 hours.

[0041] The aged hydrogel was dried under normal pressure. The drying process was 6 hours at 30°C, 6 hours at 60°C, 1 hour at 90°C, and 1 hour at 120°C.

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Abstract

The invention discloses a method for preparing reinforced aerogel, which belongs to the technical field of nano porous materials, and comprises the following steps: by using methyltrimethoxysilane asa precursor and water as a solvent and combining with a surfactant, carrying out sol-gel treatment, special aging, normal-pressure drying and the like. According to the preparation method, the specialaging is characterized in that the hydrogel is subjected to aging treatment by virtue of an aging solution, so that the polymerization degree of a precursor is improved, a gel skeleton is enhanced, and the structure of the aerogel is strengthened; therefore, the collapse of the gel structure caused by excessive capillary force in the normal-pressure drying process is avoided, the drying shrinkageof the gel is effectively controlled, and the reinforced aerogel is prepared.

Description

technical field [0001] The invention relates to a method for preparing a strengthened airgel, which belongs to the technical field of nanoporous materials. Background technique [0002] As a typical nanoporous material, airgel has important application prospects in the field of thermal insulation due to its unique properties such as high specific surface area and low thermal conductivity. However, in the preparation process of airgel materials, in order to maintain the nanopore structure without structural collapse, methods such as supercritical drying or normal pressure drying are often used. Supercritical drying can effectively maintain the pore structure, but it relies heavily on high-temperature and high-pressure equipment, and the cycle is long, the efficiency is low, and large-scale components cannot be prepared, which severely limits the large-scale application of airgel materials. In order to maintain the original shape of the pore structure, traditional atmospheric...

Claims

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Application Information

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IPC IPC(8): B01J13/00
CPCB01J13/0091
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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