Method for preparing cellulose-based aerogel by bidirectional gradient

A cellulose and gel technology, applied in the fields of packaging engineering, new materials, forestry engineering, and natural polymers, can solve problems such as unfavorable elastic recovery of aerogels, and achieve the effects of controllable size, simple guiding equipment and wide sources.

Inactive Publication Date: 2020-01-24
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the current preparation methods make the aerogel present an isotropic morphological structure. Even if the unidirectional gradient freezing preparation method is used, the obtained aerogel presents anisotropic structural characteristics, but the cross section remains isotropic. isotropic structure, which is not conducive to the elastic recovery of the airgel after compression
At present, there is no report on the preparation of honeycomb cellulose-based aerogels by two-way gradient freezing

Method used

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  • Method for preparing cellulose-based aerogel by bidirectional gradient
  • Method for preparing cellulose-based aerogel by bidirectional gradient

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Make a cylindrical polydimethylsiloxane wedge with a diameter of 2 cm and an inclination angle of 15° and place it on the bottom of a polyethylene plastic mold, place the plastic mold on a copper heat-conducting rod, and place the copper heat-conducting rod in the liquid in a nitrogen container.

[0018] (2) Take 20mL of TEMPO oxidized cellulose aqueous solution with a concentration of 0.3% and stir it evenly, and add it into the plastic mold.

[0019] (3) Add enough liquid nitrogen to the liquid nitrogen container until the cellulose in the mold is frozen and formed.

[0020] (4) Put the frozen cellulose solid block and mold into a freeze dryer and dry for 2 days.

[0021] (5) Release the mold after drying to obtain regular honeycomb structure cellulose airgel.

Embodiment 2

[0023] (1) Make a rectangular polyethylene wedge with a length and width of 5×5 cm and an inclination angle of 30° and place it on the bottom of the acrylic plastic mold. Place the plastic mold on the iron heat-conducting rod, and place the iron heat-conducting rod in a liquid nitrogen container.

[0024] (2) Take 50mL of mechanically ground cellulose aqueous solution with a concentration of 0.5% and stir it evenly, and add it into the plastic mold.

[0025] (3) Add enough liquid nitrogen to the liquid nitrogen container until the cellulose in the mold is frozen and formed.

[0026] (4) Put the frozen cellulose solid block and mold into a supercritical dryer and dry for 3 days.

[0027] (5) Release the mold after drying to obtain regular honeycomb structure cellulose airgel.

Embodiment 3

[0029] (1) Make a rectangular foam wedge with a length and width of 3×5 cm and an inclination angle of 20° and place it on the bottom of a polycarbonate plastic mold, place the plastic mold on an alloy heat conducting rod, and place the alloy heat conducting rod in a liquid nitrogen container .

[0030] (2) Take 50mL of cellulose / hydroxyethyl methacrylate aqueous solution with a concentration of 1% and stir evenly. The mass ratio of cellulose and hydroxyethyl methacrylate is 8:1, and add it to the plastic mold .

[0031] (3) Add enough liquid nitrogen to the liquid nitrogen container until the cellulose in the mold is frozen and formed.

[0032] (4) Put the frozen cellulose solid block and mold into a freeze dryer and dry for 3 days.

[0033] (5) After drying, the cellulose-based airgel with a regular honeycomb structure was obtained by demoulding.

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Abstract

The invention discloses a method for preparing cellulose-based aerogel by bidirectional gradient. The invention aims to prepare a cellulose-based aerogel with a honeycomb structure and realize a highadded value application of the cellulose-based aerogel. The method is characterized by comprising the following steps: 1) manufacturing an adiabatic wedge body, placing the adiabatic wedge body at thebottom of a plastic mold, placing the mold on a metal heat conducting rod, and placing the metal heat conducting rod in a liquid nitrogen container; 2) adding cellulose or a cellulose-based aqueous solution into the mold; 3) adding liquid nitrogen into the container to mold the solution by freezing; and 4) carrying out drying and demolding. The cellulose aerogel prepared by the method has broad application prospects in the aspects of material adsorption, heat insulation protection, drug carriers and the like.

Description

technical field [0001] The invention relates to a method for preparing cellulose-based airgel with a bidirectional gradient. The method is easy to operate, and the obtained cellulose-based airgel belongs to the field of natural polymers, and also belongs to the fields of forestry engineering, packaging engineering, and new materials. Background technique [0002] Airgel is a new type of lightweight porous functional aerogel. Compared with traditional inorganic aerogels (such as silicon aerogel), aerogel not only has a unique three-dimensional network structure, but also has low density, High porosity, high specific surface area, excellent heat resistance, high electrical conductivity and mechanical stability. At present, aerogels are widely used in various fields, for example, as gas adsorbents, catalyst supports, oil-water separation materials, etc. Therefore, exploring an economical, environmentally friendly, simple process, and rich raw material preparation process has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L1/02C08L1/04C08K3/22C08K5/54
CPCC08J9/28C08J2301/02C08J2301/04C08J2201/0484C08J2205/026C08K2201/011C08K2003/2241C08K5/54
Inventor 陈媛李改云
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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