Preparation method of transparent aerogel

An airgel and gel technology, applied in the field of airgel, can solve the problems of no flame retardancy, deformation, high porosity, etc., and achieve the effects of reducing shrinkage deformation, broad application prospects, and good heat insulation performance

Active Publication Date: 2014-06-25
海鹰空天材料研究院(苏州)有限责任公司
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  • Abstract
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  • Claims
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Problems solved by technology

Although the above-mentioned cellulose airgel has good toughness and is easy to form, and has the basic characteristics of airgel, that is, low density, large specific surface area, high porosity, etc., the drying process often occurs in the preparation of cellulose aerogel. Defects of opacity or deformation caused by shrinkage, water absorption, etc.
In addition, the cellulose airgel material obtained by the above method is hydrophilic and has no flame retardancy, which also greatly limits its application range.

Method used

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  • Preparation method of transparent aerogel
  • Preparation method of transparent aerogel
  • Preparation method of transparent aerogel

Examples

Experimental program
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Effect test

Embodiment 1

[0043] 1. Add 2kg of AmimCl-type ionic liquid to the vacuum kneader, raise the inner cavity temperature of the kneader to 80°C, add 20g of cotton pulp, and stir for 1 hour under vacuum to obtain a uniform and transparent cellulose solution.

[0044] 2. Keeping the temperature constant, add 500 g of AmimCl-type ionic liquid solution with a volume fraction of 10% butyric anhydride under stirring, and continue stirring for 20 minutes.

[0045] 3. Keep the conditions unchanged and vacuumize for 15 minutes. Pour the above-mentioned cellulose solution into the mold, let it stand, and take it out after gelling.

[0046] 4. Rinse the gel with deionized water and sequentially replace it with absolute ethanol to obtain a cellulosic alcohol gel.

[0047] 5. Replace the ethanol in the mold with the same volume of orthosilicate methyl ester, absolute ethanol, deionized water, and catalyst. The ratio is: orthosilicate methyl ester: absolute ethanol: deionized water: ammonia water = 1:10 :...

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Abstract

The invention provides a preparation method of transparent aerogel. The preparation method has the following steps of using ionic liquid to dissolve cellulose, regenerating the cellulose by absorbing air moisture to obtain gel, using a cellulose gel network as a skeleton, absorbing an inorganic aerogel precursor, carrying out secondary gelling, solvent exchange and supercritical drying process so as to obtain a cellulose / inorganic nano particle dual-continuous aerogel material with good transparency. The preparation method has the advantages that the inorganic gel introduced by the secondary gelling method has the properties of difficulty in shrinkage during drying and difficulty in water absorption after being dried, the supporting function is realized for the cellulose gel structure after the inorganic gel is compounded with the cellulose gel in the microstructure, and the shrinkage deformation of the dried cellulose aerogel is greatly reduced.

Description

technical field [0001] The invention relates to a method for preparing light-transmitting airgel, which belongs to the technical field of airgel. Background technique [0002] Cellulose is the most abundant renewable natural polymer on the earth. It contains about 10% to 25% in herbs, 40% to 53% in wood, 60% to 85% in bast such as flax, and 60% to 85% in cotton. Cellulose up to 90%. Cellulose is also the basic component of plant cells. The carbon constituting cellulose in natural organisms accounts for about 40%, and the cellulose produced by photosynthesis reaches more than 100 billion tons every year. It can be said that cellulose is an inexhaustible and inexhaustible renewable organic material in nature. resource. Moreover, the cellulose material itself is non-toxic, has strong water resistance, and meets the requirements of biodegradable and environmentally compatible materials. Therefore, the potential application range of cellulose as a matrix material is very wide....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/02
Inventor 周清詹万初张继承刘喜宗张昊刘斌邹军锋金兆国
Owner 海鹰空天材料研究院(苏州)有限责任公司
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