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

A nanofiber and chitin technology, applied in the field of chitin nanofiber preparation, can solve the problems of high cost, low yield of oxidized chitin, unsuitable pretreatment methods, etc., and achieve high production efficiency and easy operation , good economic and environmental benefits

Active Publication Date: 2018-11-09
NANJING FORESTRY UNIV
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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.

Method used

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

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preparation example Construction

[0039] In a first aspect, in at least one embodiment, a method for preparing a high carboxyl content chitin nanofiber dispersion is provided, comprising the following steps:

[0040] Pretreating the chitin raw material to obtain chitin slurry;

[0041] Using TEMPO-NaClO-NaClO 2 Oxidation system or TEMPO-NaBr-NaClO oxidation system oxidizes chitin slurry to obtain oxidized chitin;

[0042] Homogenize and sonicate the oxidized chitin to obtain a chitin nanofiber dispersion with high carboxyl content.

[0043] The present invention creatively utilizes pretreatment methods (such as polar solvent high-temperature or low-temperature treatment, mechanical pretreatment) in combination with TEMPO oxidation, on the one hand to reduce the amount of oxidant consumed by chitin in TEMPO oxidation, while reducing chitin On the other hand, oxidized chitin with high carboxyl content can be obtained to prepare chitin nanofibers with different properties and improve the preparation efficiency ...

Embodiment 1

[0080] A preparation method of high carboxyl content chitin nanofiber dispersion liquid, comprising the following steps:

[0081] (1) The source and purification of chitin: Crab shell (Portunus trituberculatus), produced in Nantong, China, the purification method of chitin in crab shell: 1) Cut the crab shell into 1cm 2 Size, soaked in 1 mol / L NaOH for more than 12 hours, then washed with distilled water to neutral to remove protein in crab shells; 2) soaked in 1 mol / L HCl for more than 12 hours, then washed with distilled water to neutral to remove crab shells 3) Repeat the above steps 2-3 times, wash with distilled water until neutral, and then wash with 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 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 sample was washed with distilled water until neutral, the...

Embodiment 2

[0087] A preparation method of high carboxyl content chitin nanofiber dispersion liquid, comprising the following steps:

[0088] (1) Source and purification of chitin: squid parietal bone, squid parietal bone chitin purification method: 1) squid parietal bone is soaked in 1mol / L NaOH for more than 12h, and then washed with distilled water until neutral to remove squid parietal bone Protein; 2) Soak in 1mol / L HCl for more than 12 hours, then wash with distilled water until neutral to remove calcium salts and other components in the squid parietal bone; 3) Repeat the above steps 2-3 times, wash with distilled water until neutral, and then with 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 sample was washed with distilled water until neutral, then pulv...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08C08J3/02C08L5/08
CPCC08B37/003C08J3/02C08J2305/08
Inventor 范一民叶文博俞娟王志国
Owner NANJING FORESTRY UNIV
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