Preparation method of chitin nano fiber dispersion liquid with high carboxyl content, chitin nano fiber dispersion liquid with high carboxyl content and application

Abstract

The invention belongs to the field of preparation of chitin nano fiber and relates to a preparation method of chitin nano fiber dispersion liquid with high carboxyl content, the chitin nano fiber dispersion liquid with high carboxyl content and application. The preparation method comprises the following steps: pre-treating a chitin raw material to obtain chitin slurry; oxidizing the chitin slurryby utilizing a TEMPO oxidation system to obtain oxidized chitin; and performing homogenization and ultrasonic treatment on the oxidized chitin to obtain the chitin nano fiber dispersion liquid with high carboxyl content. Polar solvent high temperature, polar solvent low temperature and mechanical pre-treatment methods are innovatively combined with the TEMPO oxidation system respectively so as topre-treat chitin, and then, a weakly acidic, neutral and alkaline TEMPO oxidation system is adopted to perform selective oxidation modification, thereby effectively reducing the dosage of a chemical oxidant, reducing the degradation loss of chitin in a chitin nano fiber preparation process, realizing efficient preparation of the chitin nano fiber with high carboxyl content, and providing a new idea for realizing high-value utilization of the chitin nano fiber.

Description

technical field [0001] The invention belongs to the technical field of preparation of chitin nanofibers, and in particular relates to a preparation method of a dispersion liquid of chitin nanofibers with high carboxyl content, a dispersion liquid of chitin nanofibers with high carboxyl content and applications. Background technique [0002] Due to its non-toxic, renewable, and biodegradable properties, chitin-based polysaccharide-based bionanomaterials have strong advantages in biofunctional materials, and have gradually become a research hotspot around the world. At present, surface amino chitin nanofibers and surface carboxyl chitin nanofibers can be prepared. Abundant surface amino or carboxyl groups endow chitin nanofibers with unique properties, which provide a great opportunity for functionalization and derivatization of chitin nanofibers. More active sites, especially nanofiber films, gels and other materials prepared by high carboxyl content chitin nanofiber dispersi...

AI Technical Summary

Problems solved by technology

However, there are still some problems in the existing preparation methods, such as directly performing the above-mentioned TEMPO oxidation on chitin, or using an unsuitable pretreatment method, which will inevitably cause the degradation of chitin and make the oxidized chitin Reduced yield

In addition, in order to improve the oxidation effect and obtain chitin nanofibers with higher carboxyl content, more oxidants need to be added, which not only costs high, but also causes more serious degradation.

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