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Nano chitin hydrogel and aerogel and preparation method and application thereof

A chitin and hydrogel technology, which is applied in the field of aerogel and its preparation, and nano-chitin hydrogel, can solve the problems such as the performance of nano-chitin gel needs to be improved, the elasticity is poor, and the operation is complicated, Achieve the effect of easy to achieve large-scale production, widen breadth and depth, and simple preparation method

Inactive Publication Date: 2018-11-23
NANJING FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The inventor's research team also reported a nano-chitin hydrogel / aerogel and a negatively charged nano-chitin gel and its preparation method, but the physical cross-linking of nano-chitin in the existing method The characteristics of the hydrogel / aerogel greatly limit the improvement of the mechanical strength of the hydrogel / aerogel, and the airgel materials currently prepared generally have poor elasticity and lack elasticity.
Therefore, the existing nano-chitin gel preparation method is complicated to operate, difficult to control, and difficult to mass-produce, and the performance of the prepared nano-chitin gel needs to be improved, which limits the further application of the nano-chitin gel

Method used

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  • Nano chitin hydrogel and aerogel and preparation method and application thereof
  • Nano chitin hydrogel and aerogel and preparation method and application thereof
  • Nano chitin hydrogel and aerogel and preparation method and application thereof

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preparation example Construction

[0052]In a first aspect, in at least one embodiment, a method for preparing a nano-chitin hydrogel is provided, comprising the following steps:

[0053] (a) pre-treating the chitin raw material to obtain a nano-chitin dispersion;

[0054] (b) the nano-chitin dispersion liquid is mixed with a crosslinking agent to obtain a composite dispersion liquid;

[0055] (c) subjecting the composite dispersion to freeze-thaw treatment to obtain nano-chitin hydrogel.

[0056] Chitin, also known as chitin, chitin, and chitin, is the polysaccharide that exists in the earth second only to cellulose, and is also the nitrogen-containing natural organic polymer compound with the largest amount in nature except protein. Chitin has unique physical, chemical, and biological properties, including multifunctional group reactivity, antibacterial properties, biocompatibility, and biodegradability. Nanogels have many excellent properties due to their unique microscopic network structure, such as large...

Embodiment 1

[0111] A preparation method of nano-chitin hydrogel, comprising the following steps:

[0112] (1) The source and purification of chitin: 1) The crab shell is cut into 1cm as the raw material of chitin 2 Size, soak in 1mol / L NaOH for more than 12 hours, then wash with distilled water to neutral to remove protein in crab shells; 2) soak in 1mol / L HCl for more than 12 hours, then wash with distilled water to neutral to remove crab shells 3) Repeat the above steps 2 to 3 times, wash with distilled water until neutral, then use 0.5% NaClO 2 , glacial acetic acid to adjust the pH to 5.0, bleach in a 70°C water bath for 2 hours (preheat it first to reach 2.5 hours), and stir intermittently (if the bleaching is not complete, wash to neutral and then perform secondary bleaching); 4) After bleaching The samples were washed with distilled water until neutral, then pulverized with a juice extractor, weighed, put into sealed bags and stored in a refrigerator at 4°C, and the water content ...

Embodiment 2

[0117] A preparation method of nano-chitin hydrogel, comprising the following steps:

[0118] (1) The source and purification of chitin: Shrimp shells are used as chitin raw materials and soaked in 1mol / L NaOH for more than 12 hours, and then washed with distilled water until neutral to remove the protein in the shrimp shells; 2) 1mol / L HCl Soak for more than 12 hours, then wash with distilled water until neutral to remove calcium salts and other components in the shrimp shell; 3) repeat the above steps 2 to 3 times, wash with distilled water until neutral, and then use 0.5% NaClO 2 , glacial acetic acid to adjust the pH to 5.0, bleach in a 70°C water bath for 2 hours (preheat it first to reach 2.5 hours), and stir intermittently (if the bleaching is not complete, wash to neutral and then perform secondary bleaching); 4) After bleaching The samples were washed with distilled water until neutral, then pulverized with a juice extractor, weighed, put into sealed bags and stored i...

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Abstract

The invention belongs to the technical field of application of chitin and relates to a nano chitin hydrogel and aerogel and a preparation method and application thereof. The preparation method of thenano chitin hydrogel comprises the following steps: (a) pre-treating the chitin raw material to obtain nano chitin dispersion liquid; (b) mixing the nano chitin dispersion liquid with a cross-linkingagent to obtain compound dispersion liquid; and (c) freezing and thawing the compound dispersion liquid to obtain the nano chitin hydrogel. The invention innovatively adopts the freezing and thawing treatment to successfully realize chemical cross-linking of nano chitin; the product has the characteristics of low grade, high strength, high elasticity, high porosity and the like and also has the advantages of mild conditions, strong operability and the like; and a feasible method is provided for preparation of nano chitin gels and has industrialized application prospects.

Description

technical field [0001] The invention belongs to the application technical field of chitin, and in particular relates to a nano-chitin hydrogel, an aerogel and a preparation method and application thereof. Background technique [0002] Due to their non-toxic, renewable, and biodegradable properties, chitin or cellulose-based polysaccharide materials have strong advantages in biofunctional materials, and have gradually become a research hotspot around the world. In the process of high-value utilization of chitin, different from dissolution treatment, nano-chitin has received more and more attention and has become an important aspect of high-value utilization. [0003] For the utilization of nano-chitin, hydrogel or aerogel is a good platform product. At present, there are many reports on nano-chitin hydrogel or aerogel. Among the existing reports, Chuchu Chen et al. prepared nano-chitin hydrogel and airgel materials in a calcium chloride / methanol system by vacuum filtration, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08J3/02C08J3/24C08B37/08C08L5/08
CPCC08B37/0003C08B37/003C08J3/02C08J3/075C08J3/24C08J2305/08
Inventor 范一民刘亮奥莱多·罗杰斯王志国俞娟
Owner NANJING FORESTRY UNIV
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