Preparation method of chitosan aerogel

A technology of chitosan and airgel, which is applied in the field of preparation of chitosan airgel, can solve the problems of low specific surface area and poor gel performance of chitosan gel, and achieve low equipment requirements and easy availability of raw materials , highly operable effect

Active Publication Date: 2016-10-12
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method of chitosan airgel, this invention solves the technical problem that gained chitosan gel specific surface area is low in the prior art; Gained gel performance is poor

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  • Preparation method of chitosan aerogel
  • Preparation method of chitosan aerogel
  • Preparation method of chitosan aerogel

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preparation example Construction

[0021] see figure 1 , the invention provides a kind of preparation method of chitosan airgel, comprising the following steps:

[0022] 1) Preparation of chitosan alcohol hydrogel: dissolving chitosan in an ethanol water solvent to obtain a chitosan solution with a concentration of 3 to 10 g / L, then adding a cross-linking agent solution dissolved in ethanol, stirring and standing Obtain chitosan alcohol hydrogel;

[0023] 2) After the chitosan alcohol hydrogel is aged, the mature chitosan alcohol hydrogel is obtained, and the ethanol water solvent in the mature chitosan alcohol hydrogel is replaced with an organic solvent for 1 to 3 days, and the chitosan is obtained by drying Aerogel;

[0024] The ethanol-water solvent is formed by mixing ethanol and 2wt.% acetic acid aqueous solution in a volume ratio of 30-60:40-70.

[0025] The ethanol-water solvent herein refers to a binary solvent system formed by mixing ethanol and 2wt.% acetic acid aqueous solution by volume ratio. ...

Embodiment 1

[0039] Take by weighing 1g chitosan and dissolve in the solvent system (100mL) that ethanol / 2wt.% acetic acid aqueous solution volume ratio is 30 / 70, add the 4% formaldehyde cross-linking agent solution of 100mL after stirring at room temperature for 1 hour at 5 ℃ Stir for 10 minutes and leave to stand for 30 minutes to obtain the initial chitosan alcohol hydrogel; place the resulting initial chitosan alcohol hydrogel in a constant temperature aging tank, start at an initial temperature of 10°C at a heating rate of 10°C / d Aging until 80°C, and then insulated for 1 day to obtain mature chitosan alcohol hydrogel; the ethanol water solvent in the mature chitosan alcohol hydrogel was replaced with ethanol solvent for 2 days to obtain chitosan alcohol gel, and finally in Carbon dioxide supercritical drying was carried out at 55°C and 14MPa to obtain chitosan airgel.

Embodiment 2

[0041] (1) chitosan is dissolved in the binary solvent system to form the initial chitosan solution, then stir at room temperature and add cross-linking agent ethanol solution in the chitosan solution of the above-mentioned alcohol-water binary solvent system, and finally Stir at low temperature, obtain initial chitosan alcohol hydrogel after leaving standstill;

[0042]Ethanol and 2wt.% acetic acid aqueous solution are mixed by volume ratio: 30:70 to form a binary solvent system; the initial chitosan solution concentration is 3g / L; the crosslinking agent concentration is 2wt.%. The crosslinking agent is one of formaldehyde, acetaldehyde and glutaraldehyde or any combination of more than one; the low temperature condition is 1°C.

[0043] (2) Place the obtained initial chitosan alcohol hydrogel in a constant temperature aging tank, start aging at an initial temperature of 10°C at a heating rate of 10°C / d until 60°C, and finally heat it for 1 day to obtain mature chitosan alco...

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Abstract

The invention provides a preparation method of chitosan aerogel. According to the preparation method, an ethanol-water binary solvent system is adopted, microscale active particles are produced according to different dissolving capacities of chitosan and a cross-linking agent in a binary solvent, a cross-linking fine framework can be formed by the microscale active particles in a chemical gelation process, so that the gelation probability of the raw materials is increased, and the chitosan aerogel with a high specific surface area is prepared through CO2 supercritical drying.

Description

technical field [0001] The invention relates to the technical field of organic airgel, in particular to a preparation method of chitosan airgel. Background technique [0002] Chitosan, as the second largest natural polymer material in nature after cellulose reserves, is the only biorenewable alkaline polysaccharide polymer. Chitosan is deacetylated from chitin It has the basic characteristics of rich sources, good biocompatibility, environmental degradability, high drug activity and strong antibacterial properties, and is widely used in the fields of food industry, textile industry, chemical industry and environmental protection. The development and application research of sugar is of great significance. [0003] As we all know, aerogels have potential applications in many fields such as adsorption, catalysis, heat insulation and drug sustained release. Therefore, the synthesis of chitosan airgel is particularly important. Currently, there are roughly two mechanisms for th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08J9/28C08J3/24C08L5/08
CPCC08J3/075C08J3/24C08J9/28C08J2305/08C08L5/08
Inventor 冯坚张思钊冯军宗姜勇刚
Owner NAT UNIV OF DEFENSE TECH
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