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Cellulose triacetate aerogel and preparation method

A technology of cellulose triacetate and airgel, which is applied in the field of cellulose triacetate airgel and its preparation, can solve the problems of high airgel density, long preparation cycle, and large amount of solvent, and achieve high specific surface area, The effect of short preparation cycle and low density

Active Publication Date: 2014-11-05
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cellulose airgel prepared by this method has the basic characteristics of airgel, but the disadvantage is that the preparation process is dissolved, regenerated, solvent replaced, dried, etc., the preparation cycle is long, the amount of solvent used is large, the cost is high, and its The resulting airgel is usually denser

Method used

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  • Cellulose triacetate aerogel and preparation method
  • Cellulose triacetate aerogel and preparation method
  • Cellulose triacetate aerogel and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Weigh 10g of cellulose triacetate into a flask, add 50ml of 1,4-dioxane, heat to 70°C in an oil bath while applying condensing reflux, and magnetically stir for about 2 hours to obtain a colorless, transparent and clear solution. Then, 50 ml of isopropanol was added dropwise thereto under the state of heating, stirring and condensing and reflux to obtain a colorless, transparent and clear solution. Pour the solution into a mold, seal it and let it stand and cool naturally to 20°C for about 20 hours to obtain a transparent triacetate cellulose gel. The 1,4-dioxane and isopropanol solvents in the gel were removed by supercritical carbon dioxide drying technology, and then the mold was removed to obtain a translucent cellulose triacetate airgel sample with a shape given by the mold, with a density of 103.8mg / cm 3 .

Embodiment 2

[0029] Weigh 5g of cellulose triacetate into a flask, add 50ml of 1,4-dioxane, heat to 70°C in an oil bath while applying condensing reflux, and magnetically stir for about 2 hours to obtain a colorless, transparent and clear solution. Then, 50 ml of isopropanol was added dropwise thereto under the state of heating, stirring and condensing and reflux to obtain a colorless, transparent and clear solution. Pour the solution into a mold, seal it and let it stand and cool it naturally to 10°C for about 20 hours to obtain a transparent triacetate cellulose gel. The 1,4-dioxane and isopropanol solvents in the gel were removed by supercritical carbon dioxide drying technology, and then the mold was removed to obtain a translucent cellulose triacetate airgel sample with the shape given by the mold. figure 1 From the scanning electron micrographs of the cellulose triacetate airgel prepared for this example, it can be seen that the airgel has a nanoscale microporous structure with a por...

Embodiment 3

[0031] Weigh 2.5g of cellulose triacetate into a flask, add 50ml of 1,4-dioxane, heat to 70°C in an oil bath while applying condensing reflux, and magnetically stir for about 2 hours to obtain a colorless, transparent and clear solution , and then under the state of heating, stirring and condensing and reflux, 50ml of isopropanol was added dropwise thereto to obtain a colorless, transparent and clear solution. Pour the solution into a mold, seal it and let it stand and cool naturally to 20°C for about 30 hours to obtain a transparent triacetate cellulose gel. The 1,4-dioxane and isopropanol solvents in the gel were removed by supercritical carbon dioxide drying technology, and then the mold was removed to obtain a translucent cellulose triacetate airgel sample with the shape given by the mold. figure 2 The scanning electron micrograph of the cellulose triacetate airgel prepared for this example shows that the airgel has a three-dimensional nanostructure formed by interlacing ...

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Abstract

The invention provides a cellulose triacetate aerogel and its preparation method. The cellulose triacetate aerogel is prepared by a method including the following steps: adding cellulose triacetate particles into 1,4-dioxane, heating and stirring to fully dissolve cellulose triacetate so as to form a colorless and transparent solution; adding an anhydrous alcohols solvent into the solution while heating and stirring and fully stirring and dispersing to form a colorless and transparent solution again; injecting the solution into a forming mold, standing, naturally cooling to room temperature to form wet gel and aging for some time; and carrying out supercritical drying by using carbon dioxide to remove the solvent so as to obtain the cellulose triacetate aerogel. Coagulation bath is not required for regeneration by the preparation technology. After formation of gel, supercritical drying can directly be carried out without tedious and time-consuming solvent displacement time. The cellulose triacetate prepared by the above method has advantages of low density, high specific surface area, good toughness and good formability.

Description

technical field [0001] The invention belongs to the field of preparation of cellulose airgel materials, and in particular relates to a cellulose triacetate airgel and a preparation method thereof. Background technique [0002] Airgel is one of the solid materials with the smallest density known so far. It has a three-dimensional nano-network porous structure and unique features such as high porosity, high specific surface area, low thermal conductivity, low dielectric constant, low optical refractive index, and low sound velocity. The properties of this material not only make this material arouse people's interest in basic research, but also have broad application prospects in many fields, and are expected to be used in heat insulation, sound absorption, adsorption, catalysis, and optics and electricity. Cellulose is the most abundant natural organic matter in the world, accounting for more than 50% of the carbon content in the plant kingdom. Plants (especially cotton, hemp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J3/09C08L1/12
Inventor 方瑜罗炫王朝阳黄传群陈姝帆杨睿戆张庆军
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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