Method for preparing chitosan/cellulose composite material

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...