Method for preparing chitosan/cellulose composite material

A composite material, cellulose technology, applied in the direction of cellulose/protein conjugated rayon, fiber chemical characteristics, wet spinning method, etc., can solve problems such as performance degradation, environmental pollution, etc. Good mechanical properties

Inactive Publication Date: 2010-12-01
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the preparation process of chitosan/cellulose composite materials, dilute acids and organic solvents are mostly used for dissolution and treatment, which has problems such as environmental pol...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In a round bottom flask, 1.2 g of cellulose was dissolved in 30 g of ionic liquid 1-butyl-3-methylimidazolium chloride (BMImCl), and heated to 110° C. under mechanical stirring for a period of time until the solution became transparent. In another round bottom flask, 0.6g chitosan was dissolved in 20g mixed ionic liquid (BMImCl:HMImCl=9:1, w / w), heated to 110°C under mechanical stirring and kept for a period of time until the solution was transparent. The above two solutions were mixed, mechanically stirred at 110° C. for 1 h until uniformly mixed, and then the obtained mixed solution was leveled on a glass sheet, and the glass sheet was immersed in a coagulant to obtain a gel-state film. The regenerated membrane was soaked in a coagulant for 24 hours to fully remove the ionic liquid, then it was taken out and washed alternately with ethanol and pure water for 4 times, and dried to obtain a chitosan / cellulose composite membrane material. Alternatively, the obtained mixe...

Embodiment 2

[0026] In a round bottom flask, 1.2 g of cellulose was dissolved in 30 g of ionic liquid 1-allyl-3-methylimidazolium chloride (AMImCl), and heated to 110° C. under mechanical stirring for a period of time until the solution became transparent. In another round bottom flask, 0.6g chitosan was dissolved in 20g mixed ionic liquid (AMImCl:HMImCl=8.5:1, w / w), and heated to 110°C under mechanical stirring for a period of time until the solution became transparent. The above two solutions were mixed, mechanically stirred at 110° C. for 1 h until uniformly mixed, and then the obtained mixed solution was leveled on a glass sheet, and the glass sheet was immersed in a coagulant to obtain a gel-state film. The regenerated membrane was soaked in a coagulant for 24 hours to fully remove the ionic liquid, then it was taken out and washed alternately with ethanol and pure water for 4 times, and dried to obtain a chitosan / cellulose composite membrane material. Alternatively, the obtained mixe...

Embodiment 3

[0029] In a round bottom flask, 1.5 g of cellulose was dissolved in 30 g of ionic liquid BMImCl, and heated to 110° C. under mechanical stirring for a period of time until the solution became transparent. In another round bottom flask, 0.5g chitosan was dissolved in 20g mixed ionic liquid (BMImCl:HMImCl=8:1, w / w), and heated to 110°C under mechanical stirring for a period of time until the solution was transparent. The above two solutions were mixed, mechanically stirred at 110° C. for 1 h until uniformly mixed, and then the obtained mixed solution was leveled on a glass sheet, and the glass sheet was immersed in a coagulant to obtain a gel-state film. The regenerated membrane was soaked in a coagulant for 24 hours to fully remove the ionic liquid, then it was taken out and washed alternately with ethanol and pure water for 4 times, and dried to obtain a chitosan / cellulose composite membrane material. Alternatively, the obtained mixed solution is filled into a medical syringe,...

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Abstract

The invention discloses a method for preparing a chitosan/cellulose composite material, and relates to a natural macromolecular composite material. The method for preparing the chitosan/cellulose composite material comprises the following steps of: dissolving cellulose in ionic liquid and heating to obtain solution A; dissolving chitosan into the ionic liquid and heating to obtain solution B; mixing the solution A and the solution B, levelling the mixed solution on a glass sheet, and immersing into a coagulating agent to obtain a membrane in a gel state; or spinning the mixed solution, immersing in the coagulating agent to obtain filaments in the gel state; and washing the membrane or the filaments, and drying to obtain a product. In the method, the cellulose and the chitosan are dissolved by the green solvent ionic liquid, the dissolution process depends on the powerful destruction capacity of hydrogen bonds, and an amino group of the chitosan is not protonized; and the composite material obtained by mixing the chitosan and the cellulose uniformly has excellent mechanical property, and the application of the composite material in fields of clinical medicine and the like can be expanded and promoted. The chitosan/cellulose composite material has the advantages of easy control of appearance, simple equipment requirement, simple and convenient operation, recyclability of the ionic liquid and environmental protection in the integral reaction process.

Description

technical field [0001] The invention relates to a natural polymer composite material, in particular to a preparation method of a chitosan / cellulose composite material. Background technique [0002] Nowadays, the depletion of fossil energy (oil, coal and natural gas, etc.) has become an indisputable fact, and people begin to pay attention to the development and utilization of biomass. Biomass reserves are abundant, among which the largest reserve is cellulose, and the second is chitin. Cellulose is a polysaccharide composed of many D-(+) glucose through β-1,4 glycosidic bonds. The molecular structure of chitin is similar to that of cellulose, except that the -OH group at the 2-position is covered by -NHCOCH 3 Replacement, chitin is deacetylated after treatment to become chitosan. Chitosan has one more reactive -NH than chitin 2 Chitosan and its derivatives are widely used in food, cosmetics, biomedicine, wastewater treatment, heterogeneous catalysis and other fields. Howe...

Claims

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Application Information

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IPC IPC(8): C08L1/02C08L5/08C08J5/18C08J3/09D01F8/02D01F8/18D01D5/06
CPCY02P20/54
Inventor 戴李宗肖文军吴廷华许一婷罗伟昂
Owner XIAMEN UNIV
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