Preparation method of toughened silicon dioxide aerogel, toughened silicon dioxide aerogel and application of toughened silicon dioxide aerogel

A silica and toughening technology, applied in the field of airgel, can solve the problems of production and application limitations, expensive equipment, high cost, etc., and achieve the effects of saving drying equipment costs, improving production efficiency, and reducing production costs

Active Publication Date: 2020-02-21
上海中南建筑材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Silica aerogels have already stepped out of the laboratory and entered the field of industrial application. However, due to the need for freeze-drying or supercritical drying when drying, the equipment is expensive, the cost is high, it is not suitable for large-scale production, and it is easy to break. Applications are severely limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] At room temperature, add ethyl orthosilicate, absolute ethanol and deionized water into the container at a molar ratio of 1:8:4.2, mix well, add 0.1mol / L dilute sulfuric acid to adjust the pH to 2.5 for hydrolysis, and then add hydroxide Sodium adjusted the pH to 9.5 to condense to obtain a wet gel; the wet gel was aged in a water bath at 40°C for 2 hours, then immersed in absolute ethanol for 2 hours for solvent replacement, solvent replacement was performed 3 times, and the wet gel was taken out , soaked into the n-hexane solution of 3-methacryloxypropyl dimethyl chlorosilane (the mol ratio of 3-methacryloxypropyl dimethyl chlorosilane to tetraethyl orthosilicate is 0.12: 1,3-methacryloyloxypropyldimethylchlorosilane and n-hexane (volume ratio: 1:10) for 3 hours, then take out the wet gel, irradiate cross-linking, and dry at 40°C in turn Dry in an oven for 2 hours, dry in a blast drying oven at 70°C for 3 hours, and dry in a blast drying oven at 110°C for 1.5 hours to...

Embodiment 2

[0032] At room temperature, tetraethyl orthosilicate, acetone and deionized water are added into the container at a molar ratio of 1:10:4.5, mixed evenly, hydrolyzed by adding oxalic acid to adjust the pH to 2.5, and then condensed by adding ammonia water to adjust the pH to 10.0 to obtain Wet gel; the wet gel was aged in a water bath at 60°C for 1.5 hours, immersed in absolute ethanol for 2 hours for solvent replacement, solvent replacement was performed 3 times, the wet gel was taken out, soaked in acryloyloxypropyl di The n-hexane solution of methylchlorosilane (the molar ratio of acryloyloxypropyldimethylchlorosilane to tetraethyl orthosilicate is 0.2:1, the volume of acryloyloxypropyldimethylchlorosilane to n-hexane ratio of 1:12) for 4 hours, then take out the wet gel, soak it in absolute ethanol for 2 hours and perform solvent replacement again, solvent replacement is carried out twice, then take out the wet gel, irradiate cross-linking, and in turn at 40 °C Dry in a bl...

Embodiment 3

[0034] The wet gel after radiation crosslinking in Example 2 was dried by supercritical carbon dioxide drying method to obtain toughened silica airgel 3 . The measured specific surface area (BET method) of the toughened silica airgel 3 is 660m 2 / g, the density is 0.106g / cm 3 , The porosity is 95%, the thermal conductivity at room temperature (hot wire method) is 0.0139W / (m·k), the compressive strength is 0.61MPa, and it does not break when compressed by 20%.

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Abstract

The invention relates to the technical field of aerogel, in particular to a preparation method of toughened silicon dioxide aerogel, the toughened silicon dioxide aerogel and application of the toughened silicon dioxide aerogel. The preparation method comprises the following steps: uniformly mixing a silicon source, an organic solvent and water, preparing wet gel through a sol-gel step, aging, replacing the solvent, modifying with a surface modifier, crosslinking and drying to obtain toughened silicon dioxide aerogel; wherein the surface modifier is selected from one or more of 3-methacryloyloxy propyl dimethyl chlorosilane, acryloyloxy propyl dimethyl chlorosilane, 3-methacryloyloxy propyl dimethyl methoxy silane and acryloyloxy propyl dimethyl methoxy silane. The silicon dioxide aerogelhas good toughness, the wet gel can be dried under normal pressure without damage, the device investment is saved, the production efficiency is improved, the production cost is reduced, and the silicon dioxide aerogel can be applied to the fields of thermal insulation materials, thermal insulation materials, waste gas treatment materials, wastewater treatment materials, catalysts and the like.

Description

technical field [0001] The invention relates to the technical field of airgel, in particular to a preparation method of a toughened silica airgel, a toughened silica airgel and applications thereof. Background technique [0002] Silica airgel is a new type of lightweight nanoporous amorphous solid-state material with a continuous random network structure, and its unique properties include high specific surface area, low refractive index, low electrical conductivity, low thermal conductivity, and low sound propagation velocity , low density, etc., can be applied to insulating layers with ultra-low conductivity, refractive coatings and reflective coatings, sound insulation panels, acoustic impedance coupling materials, catalyst carriers, high-efficiency heat insulation materials, rechargeable batteries, drug carriers, etc. researchers' attention. [0003] Silica aerogels have already stepped out of the laboratory and entered the field of industrial application. However, due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158
CPCC01B33/1585C01P2006/10C01P2006/12
Inventor 杨金兰
Owner 上海中南建筑材料有限公司
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