Chitin nano crystal whisker, chitin nanofiber and preparation method thereof

Abstract

The invention relates to a chitin nano-whisker, a chitin nano-fiber and a preparation method thereof. In the present invention, chitin is added to the organic acid aqueous solution, stirred and heated to obtain a dispersion liquid and centrifuged to obtain a solid mixture, which is added to an alkali solution for neutralization and then left to stand for centrifugation; water is added for washing, centrifuged, left to stand for stratification, and the upper suspension is collected to obtain chitin nanocrystals The whisker dispersion liquid, the solid precipitate in the lower layer is quantitatively diluted with water and then homogeneously treated to obtain the chitin nanofiber dispersion liquid. The present invention uses chitin as a raw material to directly prepare two-scale chitin nanomaterials, that is, its nano whiskers and nanofibers, which expands the application space of chitin materials, and prepares chitin nanomaterials homogeneously through weak acid hydrolysis and a homogenizer , the process acid recovery rate is high, environmental protection, low cost, it is a new way to prepare chitin nano-materials, and can produce two kinds of nano-chitin materials with different aspect ratios in the same process, which is the application of chitin And quantitative production provides new prospects and ways.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and in particular relates to a chitin nano whisker, a chitin nanofiber and a preparation method thereof. Background technique [0002] Chitin widely exists in the cell walls of crustaceans, insects and some microorganisms. It is the only natural polymer material with a positive charge in nature. It has a bactericidal effect and is a natural alkaline polysaccharide. Its chemical structure is very similar to that of cellulose. resemblance. Chitin is the second most abundant sugar after cellulose, and its resource is very rich, and its molecular structure contains functional groups such as amides and hydroxyl groups, which are easy to chemically modify and can produce various derivatives with different properties. The prospect is very broad and the application potential is huge. [0003] Nano-chitin materials use chitin as a raw material to make their fibers nanometer by chemical and physical methods...

AI Technical Summary

Problems solved by technology

The chemical method obtains chitin nanofibers by adding a non-solvent to the chitin aqueous solution to regenerate the chitin fibers. The operation is relatively complicated and the water consumption is large; It requires high energy consumption to reach the nanometer scale. In addition to high energy consumption and low output per unit time, the preparation of chitin nanowires by electrospinning is difficult for practical application and the diameter of the prepared chitin microfibers is not uniform.

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