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Silicon dioxide aerogel material and preparation method and application thereof

A technology of silica and airgel, applied in chemical instruments and methods, separation methods, alkali metal oxides/hydroxides, etc., can solve the problem of inability to cross-link monomers and oligomers, and inability to form three-dimensional solids Network structure and other issues to achieve good carbon dioxide adsorption performance, ensure purity, and high chemical stability

Inactive Publication Date: 2021-04-13
纳诚(邢台)新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the precursor is hydrolyzed, a large number of methyl groups are produced at the same time as the hydroxyl groups, so that in the later alkaline conditions, when the hydroxyl groups are dehydrated and condensed to form long chains of silicon and oxygen, the methyl groups make them produce a large amount of carbon-silicon short chains. The existence of short chains makes it impossible to carry out cross-linking between monomers and oligomers, so that it is impossible to form a network structure to obtain a gel with a three-dimensional network structure, and only precipitates can be generated. This is the aforementioned existing two Phase Separation in Silica Airgel Materials

Method used

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  • Silicon dioxide aerogel material and preparation method and application thereof
  • Silicon dioxide aerogel material and preparation method and application thereof

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Embodiment 1

[0022] This embodiment provides a kind of preparation method of silica airgel material, it comprises the following steps:

[0023] S1. Mix 15 mL of dimethyl sulfoxide and 5.05 mL of deionized water, then add 5 mL of methyltrimethoxysilane for mixing, and use a magnetic stirrer to stir at a constant temperature for 60 minutes to obtain a mixed solution.

[0024] S2. Add 1.5 mL of ammonia water with a concentration of 1 mol / L to the above mixed solution, stir rapidly for 0.8 min, and then cast in a mold to perform gelation for 30 min to obtain a wet gel.

[0025] S3. After placing the wet gel at room temperature for 24 hours of static aging, then soak it in ethanol for 24 hours, then wash it with acetone (exchange the ethanol three times with fresh acetone, 24 hours each time) and treat it with carbon dioxide supercritical drying. The silica airgel material can be obtained.

Embodiment 2

[0027] This embodiment provides a kind of preparation method of silica airgel material, it comprises the following steps:

[0028] S1. Mix 30 mL of dimethyl sulfoxide and 5.05 mL of deionized water, then add 5 mL of methyltrimethoxysilane for mixing, and use a magnetic stirrer to stir at a constant temperature for 60 minutes to obtain a mixed solution.

[0029] S2. Add 1.5 mL of ammonia water with a concentration of 1 mol / L to the above mixed solution, stir rapidly for 0.8 min, and then cast in a mold to perform gelation for 30 min to obtain a wet gel.

[0030] S3. After placing the wet gel at room temperature for 24 hours of static aging, then soak it in ethanol for 24 hours, then wash it with acetone (exchange the ethanol three times with fresh acetone, 24 hours each time) and treat it with carbon dioxide supercritical drying. The silica airgel material can be obtained.

Embodiment 3

[0032] This embodiment provides a kind of preparation method of silica airgel material, it comprises the following steps:

[0033] S1. Mix 45 mL of dimethyl sulfoxide and 5.05 mL of deionized water, then add 5 mL of methyltrimethoxysilane for mixing, and use a magnetic stirrer to stir at a constant temperature for 60 minutes to obtain a mixed solution.

[0034] S2. Add 1.5 mL of ammonia water with a concentration of 1 mol / L to the above mixed solution, stir rapidly for 0.8 min, and then cast in a mold to perform gelation for 30 min to obtain a wet gel.

[0035] S3. After placing the wet gel at room temperature for 24 hours of static aging, then soak it in ethanol for 24 hours, then wash it with acetone (exchange the ethanol three times with fresh acetone, 24 hours each time) and treat it with carbon dioxide supercritical drying. The silica airgel material can be obtained.

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Abstract

The invention is suitable for the technical field of aerogel materials, and provides a silicon dioxide aerogel material and a preparation method and an application thereof. The preparation method of the silicon dioxide aerogel material comprises the following steps: mixing dimethyl sulfoxide and deionized water, then adding methyltrimethoxysilane, and performing mixing to obtain a mixed solution; adding ammonia water into the mixed solution for gelling to obtain wet gel; and standing and aging the wet gel, soaking the wet gel in ethanol, washing the wet gel with acetone, and carrying out carbon dioxide supercritical drying treatment to obtain the silicon dioxide aerogel material. According to the preparation method, the silicon dioxide aerogel material with super-hydrophobicity and a fine structure can be obtained by adjusting the dosage ratio of methyltrimethoxysilane to dimethyl sulfoxide and carrying out carbon dioxide supercritical drying. The silicon dioxide aerogel material prepared by the method has good carbon dioxide adsorption performance, and can be applied to military and civil fields such as air purification, energy-saving recovery and the like.

Description

technical field [0001] The invention belongs to the technical field of airgel materials, and in particular relates to a silica airgel material and its preparation method and application. Background technique [0002] Silica airgel material is a new type of nanoporous material, which has the advantages of small density, high porosity, large specific surface area, low thermal conductivity, low light refractive index, low sound velocity, etc., and has great applications in many fields. potential. In the flexible silica airgel material, the cross-linking between the three functional group monomers ensures its strength, that is, its mechanical properties, which has become a research hotspot in the development of airgel at the present stage, but there is also a problem hindering it. Development prospects - phase separation, which is a common problem in the preparation of silica airgel. [0003] Specifically, the precursor is hydrolyzed in a polar organic solvent and deionized wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158B01J20/10B01J20/28B01J20/30B01D53/02
CPCC01B33/1585B01J20/103B01J20/28047B01J20/3085B01J20/3071B01D53/02B01D2253/106B01D2257/504Y02P20/151Y02C20/40Y02P20/50
Inventor 彭笑雪
Owner 纳诚(邢台)新材料科技有限公司
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