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Preparation method of heat-insulating TiO2/SiO2 composite aerogel material

A composite airgel and thermal insulation technology, which is applied in the direction of airgel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problems of ineffective acquisition, reduction of microstructure, thermal insulation, etc., and achieve high surface energy, Excellent infrared light shielding function, large specific surface area effect

Pending Publication Date: 2019-04-12
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method cannot effectively obtain TiO 2 / SiO 2 Composite airgel reduces the microstructure, thermal insulation and other properties of the product

Method used

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  • Preparation method of heat-insulating TiO2/SiO2 composite aerogel material
  • Preparation method of heat-insulating TiO2/SiO2 composite aerogel material
  • Preparation method of heat-insulating TiO2/SiO2 composite aerogel material

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Effect test

Embodiment 1

[0050] This embodiment provides a thermal insulation type TiO 2 / SiO 2 The preparation method of composite airgel material, concrete steps are as follows:

[0051] (1) Preparation of SiO 2 sol

[0052] The first step is to mix methyl orthosilicate, methanol, an insufficient amount of water, and an appropriate amount of hydrochloric acid. The mixed solution is refluxed at 82°C for 15 hours to achieve thorough mixing and increase the rate of hydrolysis, and then distilled at 90°C for 3 hours to remove the reaction. The generated methanol obtains partially hydrolyzed, partially polycondensed silica sol (CS); wherein the molar ratio of methyl orthosilicate, methanol, deionized water, and hydrochloric acid is 0.6:1:0.1:1×10 -5 . The second step reaction is based on the required SiO 2 Density of the airgel Mix CS with a certain amount of non-alcoholic organic solvent acetonitrile, water, and ammonia water at a volume ratio of 1:5:1.1:0.02. After sufficient hydrolysis (the temp...

Embodiment 2

[0061] This embodiment provides a thermal insulation type TiO 2 / SiO 2 The preparation method of composite airgel material, concrete steps are as follows:

[0062] (1) Preparation of SiO 2 sol

[0063] The first step is to mix tetraethyl orthosilicate, ethanol, an insufficient amount of water and an appropriate amount of hydrochloric acid. The mixed solution is refluxed at 85°C for 17 hours to achieve full mixing and increase the hydrolysis rate, and then distilled at 92°C for 4 hours to remove The ethanol generated by the reaction obtains partially hydrolyzed and partially polycondensed silica sol (CS); wherein the molar ratio of tetraethylorthosilicate, ethanol, deionized water, and hydrochloric acid is 0.7:10:0.8:2×10 -5 . The second step reaction is based on the required SiO 2 Density of the airgel Mix CS with a certain amount of non-alcoholic organic solvent acetonitrile, water, and ammonia water at a volume ratio of 1:15:1.3:0.024. After sufficient hydrolysis (the ...

Embodiment 3

[0072] This embodiment provides a thermal insulation type TiO 2 / SiO 2 The preparation method of composite airgel material, concrete steps are as follows:

[0073] (1) Preparation of SiO 2 sol

[0074] The first step is to mix tetraethyl orthosilicate, isopropanol, an insufficient amount of water and an appropriate amount of hydrochloric acid. The mixed solution is refluxed at 86°C for 18 hours to achieve full mixing and increase the hydrolysis rate, and then distilled at 93°C for 4 Remove the ethanol generated by the reaction in one hour to obtain partially hydrolyzed, partially polycondensed silica sol (CS); wherein the mol ratio of tetraethylorthosilicate, isopropanol, deionized water, and hydrochloric acid is 0.9:15:1.2:4× 10 -5 . The second step reaction is based on the required SiO 2 Density of the airgel Mix CS with a certain amount of non-alcoholic organic solvent acetonitrile, water, and ammonia water at a volume ratio of 1:25:1.4:0.026. After sufficient hydrol...

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Abstract

The invention relates to a preparation method of a heat-insulating TiO2 / SiO2 composite aerogel material. The preparation method comprises the following steps: A, doping nano TiO2 powder into SiO2 solsubjected to a hydrolysis reaction, carrying out ultrasonic dispersion, and carrying out standing and aging for forming TiO2 / SiO2 composite wet gel; B, soaking the TiO2 / SiO2 composite wet gel in a mixed solution of siloxane / organic solvent / hydrochloric acid; and C, drying the TiO2 / SiO2 composite wet gel treated in the step B at room temperature under normal pressure, carrying out heating treatment, and then carrying out cooling. The composite aerogel rapidly synthesized by the preparation method has a special nano porous structure and excellent mechanical and thermal properties, and the application value and application potential of the material in the fields of photoelectric devices, gas-sensitive sensors, heat-preservation heat-insulation and the like are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of airgel materials, and relates to a thermal insulation type TiO 2 / SiO 2 Preparation method of composite airgel material. Background technique [0002] SiO 2 Airgel is a nanoporous material composed of particles and holes with a scale between 1 and 100nm. It has strong Rayleigh scattering for blue and violet light, so generally airgel is light blue. Airgel has the characteristics of wide adjustable range of density, three-dimensional network structure and high porosity. It is also the solid material with the lowest thermal conductivity known so far, and has excellent thermal insulation performance. SiO 2 As a special nanoporous material, airgel has many excellent characteristics, such as: low density, high surface area, high optical transparency, low refractive index and extremely low thermal conductivity. Due to these special properties, SiO 2 Aerogels have received more and more atte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 刘光武薛敏钊刘燕刚
Owner SHANGHAI JIAO TONG UNIV
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