Preparation method of cellulose/metal oxide composite aerogel

A technology of composite aerogel and cellulose, applied in the field of preparing cellulose composite metal oxide aerogel, can solve the problems of low strength of metal oxide aerogel, achieve high mechanical strength and toughness, low porosity, High toughness effect

Inactive Publication Date: 2012-05-02
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional sol-gel process yields metal oxide aerogels with low strength

Method used

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  • Preparation method of cellulose/metal oxide composite aerogel
  • Preparation method of cellulose/metal oxide composite aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Firstly, the LiOH / urea (7wt% / 12wt%, wt% represents the mass percent) solution was cooled to -12°C, and then the natural cellulose raw material with a degree of polymerization of 500 was put into it, and the natural cellulose was rapidly stirred by mechanical stirring at room temperature. Dissolved to obtain a 4wt% cellulose solution. After the solution was centrifugally degassed, it was coated on a glass plate by casting method, then immersed in a 5wt% sulfuric acid solution to solidify and regenerate, and finally washed with water to obtain regeneration. Cellulose film.

[0030] The cellulose membrane is washed with water to remove inorganic salts and other impurities, and then the water in it is gradually replaced with methanol solvent. Immerse it in 50 mL of CoCl 2 Concentration is 0.0126 mol / L methanol solution, add 10ml ethylene oxide at the same time, after standing at 20 ℃ for 2 hours, a tan composite cellulose gel film is obtained. The composite gel membrane w...

Embodiment 2

[0032] The cellulose film was obtained by dissolving the natural cellulose with a degree of polymerization of 500 in NaOH / urea (7wt% / 12wt%) solvent system, and the method was the same as in Example 1.

[0033] The cellulose membrane is washed with water to remove inorganic salts and other impurities, and then the water therein is gradually replaced with ethanol solvent. Immerse it in 50 mL of CoCl 2 Concentration is 0.0084 mol / L methanol solution, add 10ml propylene oxide at the same time, after standing at 40 ℃ for 24 hours, a tan composite cellulose gel film is obtained. The composite gel membrane was first washed several times with deionized water, and then the water in the composite membrane was replaced with ethanol. The composite airgel of cellulose / cobalt oxide was obtained by supercritical drying.

Embodiment 3

[0035]The cellulose film was obtained by dissolving the natural cellulose with a degree of polymerization of 500 in NaOH / urea (7wt% / 12wt%) solvent system, and the method was the same as in Example 1.

[0036] The cellulose membrane is washed with water to remove inorganic salts and other impurities, and then the water in it is gradually replaced with methanol solvent. Immerse it in 50 mL of CoCl 2 Concentration is 0.0168 mol / L methanol solution, add 10ml propylene oxide at the same time, after standing at 40 ℃ for 36 hours, a tan composite cellulose gel film is obtained. The composite gel membrane was first washed several times with deionized water, and then the water in the composite membrane was replaced with methanol. The composite airgel of cellulose / cobalt oxide was obtained by supercritical drying.

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Abstract

The invention discloses a preparation method of cellulose / metal oxide composite aerogel. The preparation method comprises the following steps of: (1) preparing a cellulose film; (2) using deionized water to clean the cellulose film obtained in the step (1), and using an organic solvent A to replace moisture in the cellulose; (3) immersing the cellulose film obtained in the step (2) into alcohol solution of inorganic metal salt, simultaneously adding an epoxy compound, standing for reaction, and obtaining the cellulose / metal oxide composite aerogel, wherein the volume of the epoxy compound is 5-20% of the volume of the alcohol solution of the inorganic metal salt; (4) using the deionized water to clean a gel film obtained in the step (3), and then using an organic solvent B to replace the moisture in the gel film; and (5) freezing and drying or drying critically the gel film obtained in the step (4) and obtaining the cellulose / metal oxide composite aerogel. The composite aerogel obtained by the preparation method has higher specific area.

Description

technical field [0001] The invention relates to the technical field of airgel material preparation, in particular to a method for preparing cellulose composite metal oxide airgel. Background technique [0002] Airgel is a porous material with a nanostructure, its porosity is as high as 90%, and its density can be as low as 0.001g / cm 3 , is one of the lightest solid materials in the world. It is obviously different from porous materials with a pore structure at the micron and millimeter scale, and has a very large specific surface area. Due to its unique nanoporous and three-dimensional network structure, it has many unique properties, especially in high porosity, low density, low thermal conductivity, etc., and can be widely used in heat insulation materials, light-transmitting materials, insulating materials, Sound insulation materials and other fields. [0003] Cellulose is currently the most abundant renewable organic resource on the earth. It is non-toxic, and the cel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L1/02C08K3/22
Inventor 刘石林陶丹丹刘晓亚
Owner JIANGNAN UNIV
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