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Preparation method of hybrid silica airgel and hybrid silica airgel

A silica and tungsten oxide gel technology, which is applied in the preparation of hybrid silica aerogels and in the field of hybrid silica aerogels, can solve problems such as the inability to exert the heat insulation effect of tungsten oxide

Active Publication Date: 2021-09-10
广西桂德盛建筑材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three-dimensional structure of the airgel in this method is composed of SiO 2 and WO 3 Composition, can not play the thermal insulation effect of tungsten oxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0017] The preparation method of hybrid silica airgel comprises the following steps,

[0018] S1. Preparation of fine particle tungsten oxide wet gel: mix tungsten hexachloride, absolute ethanol and deionized water in a molar ratio of 1:(8-50):(8-40), add acid for hydrolysis, and obtain tungsten oxide Sol; the tungsten oxide sol is placed at 50-80°C to obtain tungsten oxide gel, which is pulverized to obtain fine particle tungsten oxide gel;

[0019] S2. Preparation of silica sol: mix silicon source, absolute ethanol and deionized water in a molar ratio of 1:(5-20):(4-10), add acid for hydrolysis, and obtain silica sol;

[0020] S3. Preparation of hybrid silica airgel: adding the fine particle tungsten oxide gel obtained in step S1 to the silica sol obtained in step S2, mixing evenly, adding alkali for condensation, and obtaining a hybrid wet gel; The hybrid wet gel is aged at 30-80° C., replaced with absolute ethanol, surface modified, and dried to obtain a hybrid silica air...

Embodiment 1

[0034] Mix tungsten hexachloride, absolute ethanol and deionized water at a molar ratio of 1:10:9, add 1 mol / L dilute hydrochloric acid to adjust the pH to 3.5 for hydrolysis to obtain tungsten oxide sol, and place the tungsten oxide sol at 70°C for gelation tungsten oxide gel was obtained, and pulverized to obtain fine particle tungsten oxide gel 1 with a particle size not exceeding 0.6 μm.

Embodiment 2

[0036] Mix tungsten hexachloride, absolute ethanol and deionized water at a molar ratio of 1:15:12, add 1mol / L oxalic acid solution to adjust the pH to 3.0 for hydrolysis to obtain tungsten oxide sol, and place the tungsten oxide sol at 60°C for gelation tungsten oxide gel was obtained, and pulverized to obtain fine particle tungsten oxide gel 2 with a particle size not exceeding 0.2 μm.

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PUM

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Abstract

The invention belongs to the technical field of aerogels, in particular to a preparation method of a hybrid silica aerogel and a hybrid silica aerogel. The tungsten oxide gel is added to the silica sol and then condensed to obtain the obtained The tungsten oxide hybrid silica aerogel is obtained after the hybrid gel undergoes aging, solvent replacement, surface modification, supercritical or freeze-drying. The invention gives full play to the thermal insulation performance of tungsten oxide, forms a hybrid aerogel in the form of gel and silicon dioxide, reduces the thermal conductivity of the aerogel at high temperature, and has better thermal insulation performance at high temperature.

Description

technical field [0001] The invention relates to the technical field of silicon dioxide, in particular to a method for preparing a hybrid silicon dioxide airgel and the hybrid silicon dioxide airgel. Background technique [0002] Silica aerogel is a new type of nanomaterial, about 99% of its volume is air. It has the characteristics of high specific surface area, low density, and low thermal conductivity. It has huge potential applications in the field of insulation materials. The thermal conductivity of silica airgel at room temperature is lower than that of air, which can be as low as 0.013W / (m k), but at high temperatures, the thermal conductivity increases rapidly due to the near-infrared radiation of 2.5-8μm is almost completely transparent. High, the thermal conductivity is 0.020W / (m·k) at 400°C, 0.025W / (m·k) at 500°C, and 0.035W / (m·k) at 650°C. [0003] In order to reduce the thermal conductivity of silica airgel at high temperature, an effective way is to add opacify...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/155C01B33/157C01B33/158C01G41/02
CPCC01B33/155C01B33/157C01B33/1585C01G41/02C01P2006/32
Inventor 黄寅福
Owner 广西桂德盛建筑材料有限公司