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Method for reinforcing hemi-cellulose membrane by utilizing CNCC (Cationic Nanocrystalline Cellulose)

A nano-microcrystalline and hemicellulose technology is used in the preparation of hemicellulose membranes, composite membranes, and cationically modified nano-microcrystalline cellulose reinforced hemicellulose membranes, which can solve the problems of low mechanical properties and poor environmental adaptability. Achieve the effect of enhanced mechanical properties and improved thermal stability

Active Publication Date: 2017-05-10
LONGYOU COUNTY JINLONG PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermoplastic film material made of hemicellulose has great potential application value in food packaging, edible coating film, wound dressing and drug carrier because of its excellent flexibility, barrier property and biocompatibility , but hemicellulose alone has the disadvantages of brittleness, low mechanical properties and poor environmental adaptability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First, weigh 84g of 3% nanocrystalline cellulose concentrate and add it to a three-neck flask, then drop in 69.72mL dimethyl sulfoxide and 6.21mL 2,3 epoxypropyltrimethylammonium chloride, add 0.13g of sodium hydroxide, magnetically stirred in a 65°C water bath for 4.5h, then sonicated for 1.5h, and finally diluted with ethanol to terminate the reaction; then, it was centrifuged to remove the supernatant and retain the bottom precipitate; then The sediment was washed repeatedly, dialyzed for 3 days, and the water was changed regularly. Finally, the dialyzed solution is evaporated and concentrated in a rotary evaporator to obtain a cationic nano-microcrystalline cellulose concentrate with a concentration of 1-3%. Weigh hemicellulose and D-sorbitol with a mass ratio of 3:1, place it in a 250ml three-neck flask, add 3% (based on the total mass of hemicellulose and D-sorbitol on a dry basis) cationic nano Microcrystalline cellulose solution, and supplemented with distilled...

Embodiment 2

[0021] First, weigh 84g of 3% nanocrystalline cellulose concentrate and add it to a three-neck flask, then drop in 69.72mL dimethyl sulfoxide and 6.21mL 2,3 epoxypropyltrimethylammonium chloride, add 0.13g of sodium hydroxide, magnetically stirred in a 65°C water bath for 4.5h, then sonicated for 1.5h, and finally diluted with ethanol to terminate the reaction; then, it was centrifuged to remove the supernatant and retain the bottom precipitate; then The sediment was washed repeatedly, dialyzed for 3 days, and the water was changed regularly. Finally, the dialyzed solution is evaporated and concentrated in a rotary evaporator to obtain a cationic nano-microcrystalline cellulose concentrate with a concentration of 1-3%. Weigh hemicellulose and D-sorbitol with a mass ratio of 3:1, place it in a 250ml three-neck flask, add 6% (based on the total dry weight of hemicellulose and D-sorbitol) cationic nano Microcrystalline cellulose solution, and supplemented with distilled water, t...

Embodiment 3

[0023] First, weigh 84g of 3% nanocrystalline cellulose concentrate and add it to a three-neck flask, then drop in 69.72mL dimethyl sulfoxide and 6.21mL 2,3 epoxypropyltrimethylammonium chloride, add 0.13g of sodium hydroxide, magnetically stirred in a 65°C water bath for 4.5h, then sonicated for 1.5h, and finally diluted with ethanol to terminate the reaction; then, it was centrifuged to remove the supernatant and retain the bottom precipitate; then The sediment was washed repeatedly, dialyzed for 3 days, and the water was changed regularly. Finally, the dialyzed solution is evaporated and concentrated in a rotary evaporator to obtain a cationic nano-microcrystalline cellulose concentrate with a concentration of 1-3%. Weigh hemicellulose and D-sorbitol with a mass ratio of 3:1, place it in a 250ml three-necked flask, and add 9% (based on the total mass of hemicellulose and D-sorbitol on a dry basis) cationic nano Microcrystalline cellulose solution, and supplemented with dis...

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Abstract

The invention discloses a method for reinforcing a hemi-cellulose membrane by utilizing CNCC (Cationic Nanocrystalline Cellulose). The method comprises the following steps: firstly, carrying out cationic modification on NCC (Nanocrystalline Cellulose) obtained through hydrolysis of cotton microcrystalline cellulose, thus obtaining the CNCC; secondly, designing a hemi-cellulose / D-sorbitol / NCC dispersion system according to a certain mass proportion, and magnetically stirring at a high speed for a certain time, thus obtaining an aqueous-phase mixed system with good dispersibility; finally, taking and pouring a certain amount of hemi-cellulose / D-sorbitol / NCC dispersion solution to a polytetrafluoroethylene die, and carrying out air blast drying, thus preparing the hemi-cellulose membrane reinforced by the CNCC. According to the method disclosed by the invention, the performance of the hemi-cellulose membrane is improved by fully utilizing the mechanical performance and the thermal stability of the CNCC; the technology is simple, industrialization is easy, the membrane forming performance is good, the strength is high, and a formed membrane has good barrier performance and good water resistance.

Description

technical field [0001] The invention relates to a hemicellulose film, in particular to a method for preparing a cation-modified nano-microcrystalline cellulose reinforced hemicellulose film, which belongs to the field of biological functional materials and produces non-toxic, completely biodegradable and excellent mechanical properties Composite film. Background technique [0002] With the depletion of the world's petrochemical resources and the deterioration of the environment, the world is facing the dual pressure of economic sustainable development and environmental protection. The conversion and utilization of renewable biomass resources has become an important way for the sustainable development of the future society. As an abundant biorenewable resource, hemicellulose is an excellent raw material for film preparation. The thermoplastic film material made of hemicellulose has great potential application value in food packaging, edible coating film, wound dressing and d...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L5/14C08L1/28C08K5/053C08B11/145C08B15/02
CPCC08B11/145C08B15/02C08J5/18C08L5/14C08J2305/14C08J2401/28C08L2201/06C08L2201/08C08L2203/16C08L1/288C08K5/053
Inventor 唐艳军张馨琪裴勤勤夏新兴郭大亮
Owner LONGYOU COUNTY JINLONG PAPER
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