Preparation method of electronegative chitin nanofiber hydrogel and aerogel

A nanofiber and chitin technology is applied in the field of preparation of negatively charged chitin nanofiber hydrogels and aerogels, and achieves the effects of widening uses, simple and efficient operation, and simple and efficient gel preparation process.

Inactive Publication Date: 2016-12-14
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It mainly solves the problem of how to gel the ultra-low concentration (<0.6%) negatively charged chitin nanofiber dispersion liquid, without going through ...

Method used

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  • Preparation method of electronegative chitin nanofiber hydrogel and aerogel
  • Preparation method of electronegative chitin nanofiber hydrogel and aerogel
  • Preparation method of electronegative chitin nanofiber hydrogel and aerogel

Examples

Experimental program
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Embodiment 1

[0030] Embodiment 1 Preparation of chitin slurry

[0031] Take the crab shell raw material, wash and cut into pieces, the chopped raw material is alternately treated with 1 M sodium hydroxide and 1 M hydrochloric acid for 12 hours, and the protein and calcium in the crab shell are removed by three cycles of treatment, and then 0.5% NaClO 2 Solution bleaching removes pigment in crab shells. After bleaching, wash the bleached crab shells with distilled water until neutral, and store them in a refrigerator at 4°C. The bleached crab shell fragments are pulverized into a slurry by a pulverizer to obtain a purified chitin slurry.

Embodiment 2

[0032] Example 2 Preparation of TEMPO oxidized chitin and negatively charged chitin nanofiber dispersion

[0033] Weigh 0.016g TEMPO, 0.1g NaBr, and 1g dry weight of purified chitin into a 200mL beaker and stir to dissolve. After the dispersion is uniform, add 5mL of chitin-containing 5% available chlorine NaClO solution to the system to start oxidation. Use a pH titration system to add 0.5M NaOH dropwise to the system at room temperature to maintain the pH at 10. When the system no longer consumes NaOH, add Stop the reaction with a few drops of ethanol, adjust the pH of the solution to 7 with 0.5M HCl, repeat centrifugal washing at 12,000 rpm for 5 min until neutral, remove the supernatant by pouring, and obtain the water-insoluble part, which is TEMPO oxidized chitin quality. The above-prepared TEMPO oxidized chitin was uniformly dispersed with distilled water at a solid-to-liquid ratio of 1:100, further homogenized and ultrasonically treated, and finally the supernatant wa...

Embodiment 3

[0034] Example 3 Preparation of Negatively Charged Chitin Nanofiber Dispersion Liquid Using Sodium Hydroxide as Weak Alkaline Medium

[0035] Weigh 0.016g TEMPO, 0.1g NaBr, and 1g dry weight of purified chitin into a 200mL beaker and stir to dissolve. After the dispersion is uniform, add 5 mL of chitin and 5% available chlorine NaClO solution to the system to start oxidation. Use a pH titration system to add 0.5M NaOH dropwise to the system at room temperature to maintain the pH at 10. When the system no longer consumes NaOH, add a few Drop ethanol to terminate the reaction, adjust the pH of the solution to 7 with 0.5M HCl, repeat centrifugal washing at 1200 for 5 minutes until neutral, and remove the supernatant by pouring to obtain the water-insoluble part. The obtained water-insoluble part is TEMPO oxidized chitin. Use distilled water to uniformly disperse the TEMPO oxidized chitin prepared above at a solid-to-liquid ratio of 1:100, adjust the pH of the solution to about 9 ...

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Abstract

The invention discloses a preparation method of electronegative chitin nanofiber hydrogel. The preparation method comprises the steps that 1, a chitin raw material is taken to be pretreated, and chitin slurry is obtained; 2, the chitin slurry obtained in the step 1 is treated through a 2,2,6,6-tetramethyl piperidine-nitrogen-oxide catalyst oxidization system to obtain TEMPO-oxidized electronegative chitin; 3, the electronegative chitin obtained in the step 2 is mechanically treated in a weakly-alkaline aqueous solution or water to prepare an electronegative chitin nanofiber dispersing solution; 4, the electronegative chitin nanofiber dispersing solution obtained in the step 3 is treated through an acidic coagulation bath or an acidic steam bath to prepare the physically-crosslinked electronegative chitin nanofiber hydrogel. According to the preparation method of the electronegative chitin nanofiber hydrogel and aerogel, the method is simple and high in operability, and hydrogel preparation can be achieved at low cost; chitin nanofiber hydrogel and aerogel materials prepared through the method have the advantages of being good in form, low in concentration and high in strength.

Description

technical field [0001] The invention relates to the field of application technology of chitin, in particular to a preparation method of negatively charged chitin nanofiber hydrogel and airgel. Background technique [0002] Chitin is a class of aminopolysaccharide biopolymers with a structure similar to cellulose. In 1963, Rudall proposed three crystal forms of chitin, α, β, and γ, based on the results obtained from X-ray diffraction spectroscopy. These three crystal forms are formed by different hydrogen bonding interactions within and between molecules. Among them, α-chitin is mostly found in the shells of crustaceans, such as shrimp shells, crab shells, etc.; β-chitin is mainly found in squid parietal bones, tube worms, diatoms and other organisms. In industrial processing, chitin is mainly obtained by removing calcium carbonate and protein through acid treatment and alkali treatment. Chitin has a wide range of applications, such as: skin care products, tissue engineeri...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J9/28C08L5/08C08B37/08
CPCC08J3/075C08B37/003C08J9/28C08J2305/08
Inventor 范一民刘亮王蓉蒋杰郑可王志国
Owner NANJING FORESTRY UNIV
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