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Surface activity adjustable nano porous silicon dioxide aerogel and its preparation method

A nanoporous and surface-active technology, applied in the directions of silicon dioxide, silicon oxide, etc., can solve the problems of limited selection of composite materials, inability to achieve hydrophobicity, and adjustable hydrophilic surface activity, and achieve the effect of low preparation cost and simple process.

Inactive Publication Date: 2006-11-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organically modified aerogels prepared by these patents only have a hydrophobic function, and cannot achieve adjustable hydrophobic and hydrophilic surface activities, and the selection of composite materials is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Methyl orthosilicate was mixed and reacted with water, ethanol and hydrochloric acid at a volume ratio of 1:10:1:0.1 at room temperature, and a wet gel was obtained after 3 hours. Submerge the wet gel in the surface modification liquid trimethylchlorosilane mixed with n-hexane-isopropanol (volume ratio at room temperature: 1:10), and soak at room temperature. After 30 hours, the wet gel was taken out, dried and pulverized properly, and dried under normal pressure at 100°C for 5 hours to obtain small hydrophobic airgel particles. Then heat treatment at 300° C. for 3 hours and 600° C. for 8 hours to obtain small hydrophilic airgel particles.

[0019] As detected by ASAP-2000 physical adsorption instrument, the airgel porosity in the material is 85%, the pore size is 5nm, and the bulk density is 200kg / m 3 , specific surface area 600m 2 / g. Tested by static drop contact angle measuring instrument, the contact angle of hydrophobic airgel is 130°, showing hydrophobicity. ...

Embodiment 2

[0021] E-40 was mixed with water, ethanol, and hydrofluoric acid in a volume ratio of 1:15:0.8:0.05 at room temperature, and a wet gel was obtained after 3 hours. Submerge the wet gel in the surface modification liquid fluorosilane and hexamethyldisiloxane cyclohexane mixture (volume ratio at room temperature: 1:5), and soak at room temperature. After 48 hours, the wet gel was taken out, dried and pulverized properly, and dried under normal pressure at 150° C. for 3 hours to obtain small hydrophobic airgel particles. Then heat treatment at 300° C. for 5 hours and 500° C. for 12 hours to obtain small hydrophilic airgel particles.

[0022] As detected by ASAP-2000 physical adsorption instrument, the airgel porosity in the material is 90%, the pore size is 15nm, and the bulk density is 150kg / m 3 , specific surface area 700m 2 / g. The contact angle of the airgel was detected by static drop contact angle measuring instrument, which was 130°, showing hydrophobicity. Hydrophilic ...

Embodiment 3

[0024] E-32 was mixed with water, ethanol, and sulfuric acid at a volume ratio of 1:3:0.5:0.02 at room temperature, and a wet gel was obtained after 3 hours. Submerge the wet gel in the isopropanol solution of the surface modification liquid dimethyldiethoxysilane (volume ratio at room temperature: 1:15), and soak at room temperature. After 36 hours, the wet gel was taken out, dried and pulverized properly, and dried under normal pressure at 200°C for 2 hours to obtain small hydrophobic airgel particles. Then heat treatment at 350° C. for 7 hours and 550° C. for 15 hours to obtain small hydrophilic airgel particles.

[0025] Tested by ASAP-2000 physical adsorption instrument, the airgel porosity in the material is 93%, the pore size is 25nm, and the bulk density is 100kg / m 3 , specific surface area 800m 2 / g. The contact angle of the airgel was detected by static drop contact angle measuring instrument, which was 120°, showing hydrophobicity. Hydrophilic airgel is soaked i...

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Abstract

This invention relates to a silica dioxide aerogel and the preparation method thereof. Said silica dioxide aerogel is surface activity adjustable and nanometer porous. The preparation procedures comprise: use polysiloxane, water, solvent and catalyst as raw material to make wet gel by sol-gel processing, wherein the volume ration of polysiloxane, water, solvent and catalyst is 1:3-15:0.5-1.0:0.02-0.1; conduct surface conditioning of the wet gel, wherein the volume ratio of the coating material and the conditioning solvent is 1:5-15; take out the wet gel to conduct normal pressure drying and sectional thermal treatment, with the temperature range between 100 and 600Deg C. This invention can transform the original hydrophobic state of the aerogel particle to hydrophilic state according to the practical need, suitable for different application requirement. It also has benefits of low cost and simple process, which makes it much qualified for industrial production.

Description

technical field [0001] The invention relates to the field of a silica airgel and a preparation method thereof. Background technique [0002] SiO 2 Airgel is a porous material with high specific surface area and low density. Due to the existence of nano-network structure, the material itself has special properties. It has a wide range of applications in many fields such as optics, electricity, acoustics, environmental protection, and metallurgy. Its application prospect is listed as the world's top ten popular science and technology by the 250th issue of "Science" in the United States. Inorganic SiO 2 Because of its high-permeability three-dimensional porous nano-network structure, aerogel has very low solid heat conduction and has a nano-hole structure that can prevent air convection heat conduction, and uses doping to reflect and absorb infrared radiation, so that SiO 2 Airgel material has become a light-weight and high-efficiency thermal insulation material with extreme...

Claims

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Application Information

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IPC IPC(8): C01B33/14
Inventor 倪星元张志华沈军吴广明周斌王孝利
Owner TONGJI UNIV
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