A preparation process of nano-carbon fiber composite silica airgel

A technology of carbon nanofibers and composite silicon oxide, which is applied to the preparation of inorganic nanocomposite materials and thermal insulation materials, and the field of nanometer mesoporous materials, can solve the problems such as the entanglement and agglomeration of carbon nanofibers are not easy to disperse, so as to avoid structural damage and stress concentration, The effect of short production cycle and improved pore structure

Inactive Publication Date: 2018-08-28
DALIAN UNIV OF TECH +1
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  • Application Information

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Problems solved by technology

[0005] In view of the problem that nano-carbon fiber entanglement and agglomeration are difficult to disperse in the preparation process of nano-carbon fiber composite airgel, the present invention combines surfactant ultrasonic dispersion method to prepare nano-carbon fiber composite airgel with uniform dispersion and excellent structure

Method used

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  • A preparation process of nano-carbon fiber composite silica airgel
  • A preparation process of nano-carbon fiber composite silica airgel
  • A preparation process of nano-carbon fiber composite silica airgel

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Embodiment 1

[0034] Dilute water glass (modulus about 3.1 Baume degree is about 40) with deionized water at a volume ratio of 1:2, perform ion exchange through a strongly acidic styrene-based cation exchange resin, and remove sodium ions to obtain a silicic acid solution. Using sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB) as dispersant, according to the mass ratio of (SDS+CTAB):CNFs=8:1, ultrasonic in silicic acid solution Disperse for 30 minutes, and use 3.0mol / L ammonia water to catalyze the gel. The gel was aged at room temperature for 12 hours, then moved into 50% methanol solution for 12 hours, and then immersed in 100% methanol for 12 hours to exchange part of pore water. Use ethanol, n-hexane, trimethylchlorosilane for solvent exchange / surface modification, the molar ratio of ethanol to trimethylchlorosilane is 2:3, the volume ratio of trimethylchlorosilane to wet gel is 1:1, time for 24h. The samples were taken out and washed with SDS+CTAB solution to re...

Embodiment 2

[0036]Water glass (modulus about 2.9 Baume degree is about 30) is diluted with deionized water at a volume ratio of 1:6, and ion exchange is performed drop by drop through a strong acidic styrene-based cation exchange resin to remove sodium ions to obtain silicon acid solution. Using methyl cellulose (MC) and sodium dodecylbenzenesulfonate (SDBS) as dispersants, according to the mass ratio of (MC+SDBS): CNFs = 4:1, ultrasonically disperse in silicic acid solution for 20min, use 1.0mol / L lithium hydroxide solution catalyzed the gel. After the gel was formed, it was aged at room temperature for 12 hours, then moved into 50% ethanol solution and soaked for 12 hours, and then moved into 100% ethanol solution for 12 hours to exchange part of pore water. Then carry out solvent exchange / surface modification with ethanol, n-hexane, trimethylchlorosilane, the molar ratio of ethanol to trimethylchlorosilane is 1:1, and the volume ratio of trimethylchlorosilane to wet gel is 1.5:1, The...

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Abstract

The invention provides a novel preparation method of carbon nanofiber composite silicon dioxide aerogel. The preparation method is characterized in that cheap sodium silicate serves as a silicon source, a silicic acid solution prepared by a sol-gel method serves as a solvent, homogeneously dispersed carbon nanofiber / SiO2 composite sol is obtained by a surfactant ultrasonic dispersion method so as to avoid the phenomenon of difficulty in dispersion of carbon nanofibers due to entanglement and agglomeration during aerogel preparation, and the carbon nanofiber composite SiO2 aerogel material homogeneous in structure and excellent in performance is obtained after gel catalyzing, ageing, solvent exchange / surface modification and ambient pressure drying. Compared with the prior art, the preparation method has the advantages of low technological cost, simple operation process and short production period. Uniform carbon nanofiber distribution and good mesoporous structure are achieved, mechanical properties and high-temperature thermal properties are also greatly improved, and accordingly the carbon nanofiber composite silicon dioxide aerogel can be widely applied to the fields of thermal insulation of constructions, chemisorption, wastewater treatment and the like.

Description

technical field [0001] The invention belongs to the field of preparation of nano-mesoporous materials, inorganic nano-composite materials and thermal insulation materials, and relates to a surfactant ultrasonic dispersion method for preparing nano-carbon fiber composite SiO 2 airgel material. Background technique [0002] SiO 2 Airgel has a nano-mesoporous network structure with low density, high specific surface area and high porosity, so SiO 2 Airgel has broad application prospects in thermal insulation, adsorption and catalyst carrier. However, SiO 2 Airgel is brittle and fragile, and its mechanical properties are poor. This shortcoming severely restricts its large-scale industrialization and practical application. In addition, at high temperature, SiO 2 Airgel is almost completely transparent to thermal radiation in the 3-8um near-infrared band, and the thermal conductivity will increase sharply with the increase of temperature. For a good heat insulation effect, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/02
CPCC04B30/02C04B22/06C04B14/386
Inventor 王宝民马海楠赵磊袁大伟
Owner DALIAN UNIV OF TECH
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