Chitosan-furfural residue nano-fiber composite membrane preparation method

Abstract

The invention discloses a chitosan-furfural residue nano-fiber composite membrane preparation method mainly comprising the following steps: furfural residue nano-cellulose is prepared, and a 1-10% nano-cellulose suspension liquid and a 1wt% chitosan acetic acid solution are prepared; the nano-cellulose suspension liquid is added into the chitosan acetic acid solution, and magnetic stirring is carried out for 1.5h; when the material is dissolved, ultrasonic dispersion is carried out for 30min; after vacuum degassing, the mixed solution is spread on a polytetrafluoroethylene plate with a flat surface; the solution is dried for 72h under vacuum and under a temperature of 45 DEG C; an obtained membrane is soaked in a 0.5mol / L NaOH solution for further neutralization; deionized water is used for washing; and the membrane is dried, such that the chitosan-furfural residue nano-fiber composite membrane is obtained. The method has the advantages that: no expensive equipment such as high-pressure homogenization equipment is needed, such that production cost is reduced; problems such as low mechanical strength and poor water resistance of chitosan membrane are solved; no complicated modification operation upon chitosan is needed, and the composite material with excellent performance can be obtained by simply adding natural high-molecular fiber.

Description

technical field

[0001] The invention relates to the technical field of packaging bags, in particular to a method for preparing a chitosan-furfural slag nanocellulose composite film for food packaging bags. Background technique

[0002] my country is a large agricultural country with many types of crops and large yields, as well as abundant resources of agricultural residues. Corn cobs, peanut shells, sorghum shells, bagasse, etc. can be used to extract furfural, and every 1 ton of furfural produced produces 12-15 tons of furfural residue, which produces about 23 million tons of furfural residue every year. It is determined by analysis that the cellulose content in the corncob furfural residue is higher than 40%, and the lignin content is about 30%. If high-quality cellulose can be extracted from corncob furfural slag to produce nanocellulose, it will not only turn waste into treasure, but also generate great economic benefits. Nanocellulose has many excellent properties, s...