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Method for continuously preparing chitin/chitosan films with different deacetylation degrees

A technology of chitosan film and deacetylation degree, which is applied in the field of natural polymers and polymer materials, can solve the problems of complicated ionic liquid preparation process, unsuitable for industrial production, and high cost, and achieve simple and convenient process and mature and reliable recycling technology , low cost effect

Active Publication Date: 2020-07-07
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of ionic liquids is complicated, time-consuming and costly, and is not suitable for industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Add chitin raw material into 40wt% potassium hydroxide solution and heat at 80°C for 1 hour to obtain a mixed solution of chitin and alkali with a degree of deacetylation of about 10%, cool down to below 30°C, add potassium hydroxide, In the mixed solution of urea, the mass fraction of potassium hydroxide in the solution is 30wt%, the mass fraction of urea is 6wt%, and the mass fraction of chitin is 3wt%. It is stirred and dissolved rapidly at a temperature above the freezing point, and the concentration is obtained after centrifugal degassing. 3wt% chitin solution. The chitin solution was flow-cast, immersed in 20wt% ethanol aqueous solution at 0° C., and coagulated to form a film, and the coagulation time was 2 hours. The resulting film was removed with deionized water to obtain a chitin wet film with a tensile strength of 0.3 MPa and an elongation at break of 110%, and then dried naturally. The mechanical properties of the chitin film prepared above are tested, and t...

Embodiment 2

[0035] Add chitin raw material into 40wt% potassium hydroxide solution and heat at 80°C for 1 hour to obtain a mixed solution of chitin and alkali with a degree of deacetylation of about 10%, cool down to below 30°C, add potassium hydroxide, In the mixed solution of urea, the mass fraction of potassium hydroxide in the solution is 28wt%, the mass fraction of urea is 4wt%, and the mass fraction of chitin is 5wt%. It is stirred and dissolved rapidly at a temperature above the freezing point, and the concentration is obtained after centrifugal degassing. 5wt% chitin solution. The chitin solution was flow-cast, immersed in 50 wt% ethanol aqueous solution at 10°C and coagulated to form a film, and the coagulation time was 2 hours. Remove the chemical reagents from the obtained film with deionized water to obtain a chitin wet film with a tensile strength of 0.4 MPa and an elongation at break of 120%, and then dry naturally. The mechanical properties of the chitin film prepared abov...

Embodiment 3

[0037] Add chitin raw material into 40wt% potassium hydroxide solution and heat at 80°C for 1 hour to obtain a mixed solution of chitin and alkali with a degree of deacetylation of about 10%, cool down to below 30°C, add potassium hydroxide, In the mixed solution of urea, the mass fraction of potassium hydroxide in the solution is 25wt%, the mass fraction of urea is 8wt%, and the mass fraction of chitin is 7wt%. It is stirred and dissolved rapidly at a temperature above the freezing point, and the concentration is obtained after centrifugal degassing. 7wt% chitin solution. The chitin solution was flow-cast, immersed in 80wt% ethanol aqueous solution at 20° C., and coagulated to form a film, and the coagulation time was 2 hours. Remove the chemical reagents from the obtained film with deionized water to obtain a chitin wet film with a tensile strength of 0.45 MPa and an elongation at break of 125%, and then dry naturally. The mechanical properties of the chitin film prepared a...

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Abstract

The invention discloses a method for continuously preparing chitin / chitosan films with different deacetylation degrees. A chitin raw material is prepared into different deacetylated chitin / chitosan ina potassium hydroxide solution; the chitin / chitosan is continuously stirred and rapidly dissolved in a solvent composition containing potassium hydroxide, urea, water and the like at a low temperature without separation and purification, and a high-concentration chitin / chitosan stock solution is prepared. The method further includes filtering, defoaming, casting, immersing in a coagulator, and carrying out solidification regeneration at a certain temperature to obtain chitin / chitosan wet films with different deacetylation degrees; and washing with water, drafting and drying to obtain the chitin / chitosan film material with high strength and high elongation at break. The method is simple in process, and the obtained chitin / chitosan film has good mechanical properties, light transmittance and biocompatibility and has wide application prospects in the fields of food packaging, alcohol-water separation, biomedical materials, sewage treatment and the like.

Description

technical field [0001] The invention belongs to the field of natural macromolecules and macromolecular materials, and in particular relates to a continuous preparation of chitin / chitosan films with different degrees of deacetylation and a preparation method thereof. Background technique [0002] Chitin is a substance second only to cellulose in natural polymer materials. It is widely found in chitin-like animals, such as crab shells and shrimp shells. It is also found in squid, earthworms and other molluscs and some fungi. Because chitin has properties such as biocompatibility and degradability, as well as properties such as hemostasis, promotion of wound healing, and antibacterial properties, chitin films are widely used in the fields of food industry, water treatment, and biomedical materials. However, there are a large number of hydrogen bonds between chitin molecules, high crystallinity, insoluble in water and common organic solvents, which limit the application of chiti...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08B37/08A61L15/28A61L15/46A61L15/18B01J20/26B01J20/30C02F1/28B01D71/74B01D67/00C02F1/44C02F101/20C02F101/22C02F101/34C02F101/38C02F103/30
CPCA61L15/18A61L15/28A61L15/46A61L2300/102A61L2300/104A61L2300/404B01D67/0002B01D71/74B01J20/26C02F1/285C02F1/44C02F2101/20C02F2101/22C02F2101/308C02F2101/34C02F2101/38C02F2103/30C08B37/003C08J5/18C08J2305/08
Inventor 蔡杰陈毅军钟奕张晴张俐娜
Owner WUHAN UNIV
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