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A kind of preparation method of cellulose airgel with oriented pore structure

A cellulose airgel and cellulose technology, which is applied in the field of cellulose airgel preparation, can solve the problems of reducing material application performance, inability to realize mass transfer, heat transfer, long transmission path, etc., and achieve cellulose aircondensation Controllable glue structure, enhanced adsorption performance and insulation performance, and improved application performance

Active Publication Date: 2019-06-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The pore structure in the cellulose airgel prepared by the prior art is in a disordered state, and this kind of airgel material with a disordered pore structure cannot realize directional mass transfer, heat transfer and other functions, and at the same time, due to its long transmission path, Reduce the application performance of the material

Method used

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  • A kind of preparation method of cellulose airgel with oriented pore structure
  • A kind of preparation method of cellulose airgel with oriented pore structure
  • A kind of preparation method of cellulose airgel with oriented pore structure

Examples

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Effect test

Embodiment 1

[0029] A. Solution preparation: Weigh lithium chloride (LiCl) and dissolve it in dimethylacetamide (DMAC) at room temperature. The mass ratio of lithium chloride to dimethylacetamide is 3%, airtight, under mechanical stirring Heat in a sand bath with a stirring rate of 10 rpm and a heating rate of 5°C / min, heat to 95°C for 20 minutes, then heat to 105°C for 30 minutes at a rate of 5°C / min for use;

[0030] B. Preparation of cellulose sol: Weigh the cellulose-containing raw material (which contains 100wt% cellulose I) and dissolve it in the solution prepared in step A. The mass ratio of the cellulose-containing raw material to the solution prepared in step A 10%, mechanical stirring and heating, the stirring rate is 10rpm, the heating rate is 5°C / min, the mixture is heated to 120°C and kept for 10min, then the mixture is taken out and ultrasonicated at 80°C for 10min; room temperature, then mechanically stir and heat again, the stirring rate is 10rpm, the heating rate is 5°C / mi...

Embodiment 2

[0033]A. Solution preparation: Weigh lithium chloride (LiCl) and dissolve it in dimethylacetamide (DMAC) at room temperature. The mass ratio of lithium chloride to dimethylacetamide is 0.5%, airtight, under magnetic stirring Put it in an oil bath and heat it with a stirring rate of 500 rpm and a heating rate of 10°C / min, heat to 90°C and keep it for 55 minutes, then heat it at a rate of 10°C / min to 110°C and keep it for 55 minutes for use;

[0034] B. Preparation of cellulose sol: Weigh the cellulose-containing raw material (which contains 60wt% cellulose II) and dissolve it in the solution prepared in step A. The mass ratio of the cellulose-containing raw material to the solution prepared in step A 0.2%, magnetic stirring and heating, the stirring rate is 500rpm, the heating rate is 10°C / min, the mixture is heated to 105°C and kept for 15min, then the mixture is taken out and ultrasonicated at 60°C for 30min; Room temperature, then heated again with magnetic stirring, the sti...

Embodiment 3

[0037] A. Preparation of solution: Weigh lithium chloride (LiCl) and dissolve it in dimethylacetamide (DMAC) at room temperature, the mass ratio of lithium chloride to dimethylacetamide is 28%, airtight, under magnetic stirring Place in an oil bath and heat at a stirring rate of 1200rpm, a heating rate of 20°C / min, heat to 99°C for 2 minutes, and then heat to 118°C for 2 minutes at a rate of 20°C / min for use;

[0038] B. Preparation of cellulose sol: Weigh the cellulose-containing raw material (which contains 50wt% cellulose I and 30wt% cellulose II) and dissolve it in the solution prepared in step A. The cellulose-containing raw material and step A The mass ratio of the prepared solution is 23%, heated by magnetic stirring, the stirring rate is 1200rpm, the heating rate is 20°C / min, the mixed solution is heated to 145°C and kept for 45min, then the mixed solution is taken out and ultrasonically treated at 40°C for 100min ;After the ultrasonic wave is finished, cool down to ro...

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Abstract

The invention discloses a preparation method of cellulose aerogel with an orientating pore structure. The preparation method comprises the following steps of accurately swelling and dissolving the cellulose in a step type cooling way, so as to obtain cellulose sol; controlling the physical crosslinking points of the cellulose sol, so as to form cellulose gel; drying the cellulose gel in a freeze-drying way, so as to obtain the cellulose aerogel material with the orienting pore structure. The preparation method has the advantages that the pore structure of the cellulose aerogel can be designed and prepared; by adopting the pore with the orienting structure, the orienting mass transfer property of the cellulose aerogel material can be enhanced, the isolation property of the cellulose aerogel can also be enhanced, and the application range is greatly widened.

Description

technical field [0001] The invention relates to a preparation method of cellulose airgel with an orientation hole structure, belonging to the technical field of new materials. Background technique [0002] Cellulose is a natural polymer with the largest reserves, the widest distribution, renewable and biodegradable in nature. Compared with synthetic polymers, it has the characteristics of non-toxic, non-polluting, easy to modify, and good biocompatibility. However, due to the presence of a large number of hydrogen bonds in and between molecules, natural cellulose does not melt, and is difficult to dissolve in conventional solvents, making it difficult to process. However, the traditional preparation methods of cellulose materials will generate a large amount of waste water and waste gas, which will seriously pollute the environment. These problems greatly limit the development and application of cellulose materials. In recent years, with the development of new high-efficie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/04C08J3/11C08J3/24C08J3/075C08J9/28
CPCC08J3/075C08J3/11C08J3/24C08J9/28C08J2201/0484C08J2205/026C08J2301/04C08L1/04C08L2203/14
Inventor 董祥李如燕李智雄白翯
Owner KUNMING UNIV OF SCI & TECH
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