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Cellulose aerogel and preparation method for hybrid aerogel thereof

A cellulose aerogel and a technology for cellulose gel are applied in the field of preparing cellulose aerogel and its hybrid aerogel to achieve the effects of low thermal conductivity, wide sources and environmental friendliness

Active Publication Date: 2015-11-04
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of zinc chloride to dissolve cellulose to prepare cellulose aerogels has not been reported.

Method used

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  • Cellulose aerogel and preparation method for hybrid aerogel thereof
  • Cellulose aerogel and preparation method for hybrid aerogel thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1, preparation cellulose airgel

[0039] Prepare 100 g of 65% zinc chloride aqueous solution, add 2 g of microcrystalline cellulose, heat up to 60° C. in an oil bath, apply mechanical stirring, and centrifugally defoam to obtain a transparent and uniform cellulose solution. Pour the cellulose solution into the mold to set it. Put the sample into 50% ethanol / water solution, let it stand for 12 hours, take it out, and the cellulose is solidified and regenerated into cellulose gel. Washed several times with ethanol to obtain cellulosic alcohol gel. Ethanol is removed by supercritical carbon dioxide drying technology to obtain block cellulose airgel. The prepared cellulose airgel and its structure such as figure 1 shown. The thickness of the airgel sample is about 5mm and the density is 0.15g / cm 3 , the pore size is nanoscale, and the compressive strength is 2.07MPa when the strain is 20%.

Embodiment 2

[0040] Embodiment 2, preparation cellulose / nanometer montmorillonite airgel

[0041] Prepare 100g of 70% zinc chloride aqueous solution, add 2g of microcrystalline cellulose, then add 0.1g of nano-montmorillonite, heat up to 60°C in an oil bath, apply mechanical stirring, and centrifugal defoaming to obtain a uniform cellulose hybrid solution. Pour the cellulose solution into the mold to set it. The sample was put into 50% ethanol / water solution, left for 12 hours, and then taken out to obtain a cellulose hybrid gel. After washing with ethanol several times, the cellulose hybrid alcohol gel was obtained. Ethanol is removed by supercritical carbon dioxide drying technology to obtain bulk cellulose / nano-montmorillonite airgel. The prepared cellulose / nano-montmorillonite airgel and its structure such as figure 2 shown. The thickness of the airgel sample is about 5mm, and the density is about 0.18g / cm 3 , the pore size is nanoscale, and the compressive strength when the str...

Embodiment 3

[0042] Embodiment 3, preparation cellulose airgel

[0043] Prepare 100 g of 50% zinc chloride aqueous solution, add 1 g of microcrystalline cellulose, heat up to 40° C. in an oil bath, apply mechanical stirring, and centrifugally defoam to obtain a transparent and uniform cellulose solution. Pour the cellulose solution into the mold to set it. Put the sample in water and take it out after standing for 6 hours. The cellulose is solidified and regenerated into cellulose gel. After washing with water for several times, the cellulose hydrogel was obtained. The water is removed by freeze-drying drying technology to obtain block cellulose airgel. The thickness of the airgel sample is about 5mm, and the density is about 0.1g / cm 3 .

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Abstract

The invention discloses low-cost green cellulose aerogel and a preparation method for hybrid aerogel thereof. The preparation method for the hybrid aerogel of the cellulose aerogel comprises the following steps that cellulose is dissolved into a zinc chloride aqueous solution, centrifugal deaeration is performed, and a uniform and transparent cellulose solution is obtained; the cellulose solution is formed, then the formed cellulose solution is placed into a coagulating bath to be regenerated, in addition, the regenerated cellulose solution is fully washed by use of a solvent, and cellulose solvent gel is obtained; the solvent in the cellulose solvent gel is removed by use of supercritical carbon dioxide drying or freeze drying, and the cellulose aerogel is obtained. Functional filler can be added into the cellulose solution to obtain the hybrid aerogel. By the adoption of different solution forming methods, the cellulose aerogel and the hybrid aerogel thereof in the shapes of sheets, fibers, particles and the like can be prepared. The preparation method is low in cost and is environmentally friendly, and the prepared aerogel is provided with a uniform nano-grade net porous structure.

Description

technical field [0001] The invention provides a method for dissolving cellulose in zinc chloride aqueous solution to prepare cellulose airgel and hybrid airgel. Background technique [0002] The airgel material is a solid material with a porous network structure formed after removing the liquid solvent in the gel under the condition that the three-dimensional network structure of the gel remains unchanged. Airgel materials usually have a large number of nano-sized pore structures, endowing the material with ultra-high porosity (80-99.8%), ultra-high specific surface area (100-1600m 2 / g), low density and excellent sound and heat insulation properties. The earliest airgel was a silica airgel prepared by Kistler (Nature, 1931, 227:741) in 1931 by hydrolyzing water glass through a sol-gel process. But until the late 1970s, the basic research and application development of aerogels represented by silica aerogels, carbon aerogels and multi-component composite functionalized aer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J3/02C08L1/02C08L97/02C08K3/04C08K7/20C08K3/34C08K7/00C08K3/22
Inventor 余坚马书荣米勤勇张军
Owner INST OF CHEM CHINESE ACAD OF SCI
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