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Preparation method of sleeve-fish bone nanofiber

A nanofiber, squid technology, applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of unable to prepare nanofibers, unable to prepare nanofibers, etc., and achieve the effect of broad application prospects.

Active Publication Date: 2017-06-20
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanofibers could not be prepared after TEMPO oxidation of chitin purified from squid bone
The reason may be that some aldehyde groups will be formed during the oxidation process, and the aldehyde groups are prone to hemiacetal reactions with hydroxyl groups, so nanofibers cannot be prepared
Another reason may be that the generated carboxyl groups will also react with the original amino groups, and nanofibers cannot be prepared.

Method used

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  • Preparation method of sleeve-fish bone nanofiber
  • Preparation method of sleeve-fish bone nanofiber
  • Preparation method of sleeve-fish bone nanofiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1 gram of squid bone was added to 100 ml of 10wt% ammonium persulfate solution, stirred and heated at 40°C for 72 hours to obtain a chitin flocculent reactant, washed to neutrality, and prepared a 0.1wt% aqueous dispersion The pH is adjusted to 9,300W for 15 minutes with sodium hydroxide with a mass fraction of 4wt% to obtain a translucent aqueous dispersion of β-crystalline chitin nanofibers with carboxyl groups.

Embodiment 2

[0041] 1 gram of squid bone was added to 100 ml of 25wt% ammonium persulfate solution, stirred and heated at 60°C for 48 hours to obtain a chitin flocculent reactant, washed to neutrality, and prepared a 0.1wt% aqueous dispersion Using 4wt% sodium hydroxide to adjust the pH to 9,800 W and ultrasonic for 5 minutes to obtain a translucent aqueous dispersion of chitin nanofibers with carboxyl group-containing α and β crystal forms.

Embodiment 3

[0043] 2 grams of squid bone was added to 200 ml of 50wt% ammonium persulfate solution, stirred and heated at 70°C for 12 hours to obtain a chitin flocculent reactant, washed to neutrality, and prepared a 0.2wt% aqueous dispersion , Adjust the pH to 9 with sodium hydroxide with a concentration of 4 wt%, and ultrasound at 1000 W for 5 minutes to obtain a translucent aqueous dispersion of α-crystalline chitin nanofibers with carboxyl groups.

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Abstract

The invention discloses a preparation method of sleeve-fish bone nanofiber. The preparation method comprises the following steps: by adopting an unpurified sleeve-fish bone as a raw material, directly adding the unpurified sleeve-fish bone into an ammonium persulfate solution with different concentrations for reacting, and then assisting with machinery (grinding through an ultraphonic machine and a homogenizer, and the like). Through the method, carboxylic chitin nanofiber with different crystalline forms can be obtained, the fiber diameter is around 5 nanometers, and the fiber length is in a micron order. According to the preparation method provided by the invention, the carboxylic chitin nanofiber with different crystalline forms, long fiber and high strength can be provided.

Description

Technical field [0001] The invention relates to the field of preparing chitin nanofibers, belonging to the field of natural polymers, and also to the fields of chemistry, chemical engineering, agriculture, and environmental engineering. Background technique [0002] Chitin is the second largest natural biopolymer next to cellulose. Its molecular chain contains a large amount of acetamido and a small amount of amino. figure 1 As shown, it is also a renewable natural nitrogen-containing polymer. There are a large number of α-type and β-type chitin in nature. The main difference is that the crystal structure of α-chitin is composed of anti-parallel molecular chains, so there are strong intermolecular and intramolecular hydrogen bonds. Force. The crystal structure of β-chitin is composed of parallel molecular chains. Compared with α-chitin, it has weaker intermolecular forces, so β-chitin is more prone to chemical reactions. Natural α-chitin coexists with a large amount of protein ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/00C08B37/08
CPCD01F9/00C08B37/003
Inventor 张建明马琴燕段咏欣丁贝贝
Owner QINGDAO UNIV OF SCI & TECH
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