Modification method of aerogel

An airgel and modification technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as complex reaction steps, unsuitable for large-scale industrial production, and poor environmental friendliness, and achieve mechanical properties Poor, wide applicability, good environmental friendliness

Active Publication Date: 2020-06-05
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can significantly improve the mechanical properties of silica aerogels, but the reaction steps are complicated, requiring the use of a variety of organic solvents, and the environmental friendliness is relatively poor, so it is not suitable for large-scale industrial production

Method used

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  • Modification method of aerogel

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] Silica airgel was treated at 200°C for 3 hours and then reacted with vinylmethyldichlorosilane vapor at 20°C for 24 hours to graft vinylmethyldichlorosilane on the surface of silica airgel; the grafted silica gas Gel warp strength 100mW / cm 2 The vinyl group on the modifier is cross-linked by ultraviolet irradiation for 30 minutes, and then heat-treated at 200° C. for 24 hours to further cross-link the vinyl group to obtain the modified silica airgel. The density of the modified silica airgel is increased by 50%, the strength is increased by 30 times, the thermal conductivity is increased by 30%, and the water contact angle is 120°.

[0022] See attached picture, figure 1 It is a schematic diagram of the hydrophobic performance of the modified silica airgel prepared in Example 1. A macromolecular protective layer is formed on the surface of silica airgel particles through grafting and polymerization crosslinking, which solves the problems of poor mechanical properties ...

example 2

[0024] After the alumina airgel was treated at 250°C for 1 hour, it was reacted with vinyl dimethyl chlorosilane vapor at 40°C for 4 hours to graft vinyl dimethyl chlorosilane on the surface of the alumina airgel; the grafted alumina gas Gel warp strength 200mW / cm 2 The vinyl group on the modifier is cross-linked by ultraviolet irradiation for 10 minutes, and then heat-treated at 250° C. for 4 hours to further cross-link the vinyl group to obtain the modified alumina airgel. The density of the modified alumina airgel is increased by 5%, the strength is increased by 6 times, the thermal conductivity is increased by 15%, and the water contact angle is 120°.

example 3

[0026] Zirconia airgel was treated at 300°C for 1 hour, mixed with vinyl dimethyl chlorosilane and mercaptopropylmethyldimethoxysilane, and reacted at 60°C for 12 hours to make vinyl dimethyl chlorosilane and mercaptopropyl Methyldimethoxysilane is grafted on the surface of zirconia airgel; the strength of grafted zirconia airgel is 100mW / cm 2 The vinyl and mercaptopropyl groups on the modifier were cross-linked by ultraviolet irradiation for 20 minutes, and then heat-treated at 250° C. for 12 hours to further cross-link the vinyl and mercaptopropyl groups to obtain the modified zirconia airgel. The density of the modified zirconia airgel is increased by 30%, the strength is increased by 20 times, the thermal conductivity is increased by 20%, and the water contact angle is 125°.

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Abstract

The invention belongs to the field of preparation of novel materials, and particularly relates to a modification method of aerogel. According to the method, organic steam is adopted to be chemically grafted with hydroxyl on the surface of aerogel; groups in the modifier are crosslinked on the surface of the aerogel through ultraviolet irradiation and high-temperature heat treatment to form macromolecules so as to protect the network structure of the aerogel, so that the mechanical property and the hydrophobic property of the aerogel are improved, and the method is flexible, free, wide in applicability, good in environmental friendliness and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of preparation of new materials, and relates to a modification method of an airgel material. Background technique [0002] Airgel has structural characteristics such as low density, high specific surface area, and large porosity, endowing it with excellent properties such as heat insulation, adsorption, and catalysis, and is widely used in industrial production, building energy conservation, aerospace, and other fields. However, the disadvantages of poor mechanical properties and powder dropping of airgel greatly limit the development of SiO 2 Airgel applications. In order to solve the problem of poor mechanical properties of aerogels, researchers have carried out a large number of studies on polymer crosslinked silica aerogels [Chem.Mater.2010,22,2790–2803; Chem.Mater.2005,17, 1085-1098; J Mater Chem 16:3046–3054; Acc Chem Res 40:874–884], formed by grafting amino groups on the surface of silica wet gel, amino grou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/159
CPCC01B33/159
Inventor 沈晓冬孔勇江国栋
Owner NANJING UNIV OF TECH
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