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Chitosan-furfural residue nano-fiber composite membrane preparation method

A technology of nanocellulose and furfural residues, which is applied in fiber raw material processing, textile and papermaking, etc., can solve the problems of low mechanical strength and poor water resistance, and achieve the effects of less environmental pollution, lower production cost and simple preparation process.

Active Publication Date: 2014-11-05
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pure chitosan film has the disadvantages of low mechanical strength and poor water resistance, and its practical application is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method of chitosan-furfural slag nano-cellulose composite film, mainly comprising the steps of: weighing 1g of furfural slag and putting it into a 100ml Erlenmeyer flask, adding 65ml of distilled water, 0.5g of sodium chlorite and about 10 drops of ice Shake well after acetic acid, heat in a constant temperature water bath at 75°C; shake regularly every 10 minutes, add 0.5g sodium chlorite and 10 drops of glacial acetic acid every 1 hour, repeat 4 to 5 times, until the yellow-green gas in the bottle After disappearing, take it out, pour out the upper layer of yellow-green liquid after standing for stratification, then filter the residual liquid and wash it several times until neutral, put the obtained suspension into an ultrasonic cell disruptor and ultrasonicate for 30 minutes at a power of 600W to prepare Obtain nanoscale furfural slag nanocellulose, and finally dry it in a vacuum freeze dryer to obtain powdered nanocellulose, the crystal of the nanocellu...

Embodiment 2

[0020] A preparation method of chitosan-furfural slag nano-cellulose composite film, mainly comprising the steps of: taking 1g of furfural slag and putting it into a 100ml Erlenmeyer flask, adding 65ml of distilled water, 0.5g of sodium chlorite and 10 drops of glacial acetic acid Afterwards, shake well, place in a constant temperature water bath at 75°C and heat; shake regularly every ten minutes, add 0.5g sodium chlorite and 10 drops of glacial acetic acid every hour, repeat 4 to 5 times, until the yellow-green gas in the bottle disappears Then take it out, pour off the yellow-green liquid in the upper layer after standing for stratification, then filter the residue and wash it several times to neutrality, put the obtained suspension into an ultrasonic cell crusher and ultrasonicate for 30 minutes at a power of 600W to obtain Nanoscale furfural slag nanocellulose is finally dried in a vacuum freeze dryer to obtain powdered nanocellulose, the crystal of the nanocellulose is ro...

Embodiment 3

[0022] A preparation method of chitosan-furfural slag nano-cellulose composite film, mainly comprising the steps of: weighing 1g of furfural slag and putting it into a 100ml Erlenmeyer flask, adding 65ml of distilled water, 0.5g of sodium chlorite and about 10 drops of ice Shake well after acetic acid, heat in a constant temperature water bath at 75°C; shake regularly every 10 minutes, add 0.5g sodium chlorite and 10 drops of glacial acetic acid every 1 hour, repeat 4 to 5 times, until the yellow-green gas in the bottle After disappearing, take it out, pour out the upper layer of yellow-green liquid after standing for stratification, then filter the residual liquid and wash it several times until neutral, put the obtained suspension into an ultrasonic cell disruptor and ultrasonicate for 30 minutes at a power of 600W to prepare Get nanoscale furfural slag nanocellulose, dry in vacuum freeze dryer at last, obtain powdered nanocellulose, the crystal of described nanocellulose is ...

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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...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L5/08C08L1/02D21C5/00
Inventor 李淑君董峰闫美玲李春杰
Owner NORTHEAST FORESTRY UNIVERSITY
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