Preparation method of nano-cellulose-based oxygen isolation composite film

A technology of nanocellulose and composite film, which is applied in the field of preparation of nanocellulose-based oxygen-barrier composite film, which can solve the problems of poor water resistance, easy shrinkage of TOCN film, decline in mechanical properties and oxygen barrier performance, and achieve excellent water resistance and The effect of mechanical properties and excellent oxygen barrier performance

Pending Publication Date: 2021-01-12
INNER MONGOLIA AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large amount of hydroxyl and carboxyl groups on the surface of TOCN, the TOCN film is easy to shrink after drying. In addition, the strong hydrophilicity of TOCN will also lead to a significant decrease in its mechanical properties and oxygen barrier properties in a humid environment, thus affecting the product. appearance and application
How to effectively improve the poor water resistance and drying shrinkage of TOCN without affecting other properties of TOCN is a major problem to be solved urgently.
[0003] Polyvinyl alcohol (PVA) is a water-soluble polymer with hydroxyl obtained by hydrolysis of polyvinyl acetate. It has good film-forming properties, solvent resistance and biodegradability, but its disadvantages are water resistance, gas barrier Poor performance and mechanical properties

Method used

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  • Preparation method of nano-cellulose-based oxygen isolation composite film
  • Preparation method of nano-cellulose-based oxygen isolation composite film
  • Preparation method of nano-cellulose-based oxygen isolation composite film

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Embodiment 1

[0027] The preparation method of the nanocellulose-based oxygen-barrier composite film of the present embodiment, the method is:

[0028] S1. Add sodium chlorite a, glacial acetic acid a and distilled water to the larch pulp powder to obtain a pre-extraction solution, perform delignification treatment in a water bath at a temperature of 75°C, and add sodium chlorite b every 1 hour and glacial acetic acid b, add a total of 2 times, carry out delignification treatment for 4 hours, and obtain the initial lignocellulose extract, and then vacuum filter, wash with deionized water until neutral, wash with acetone, and store at a temperature of 30°C dry under the condition of dry, obtain the lignocellulose of water content≤10%; The addition amount of described sodium chlorite b every time is the same as the addition amount of sodium chlorite a in the described pre-extract; The glacial acetic acid b The supplementary amount each time is the same as the addition amount of glacial acetic...

Embodiment 2

[0055] The preparation method of the nanocellulose-based oxygen-barrier composite film of the present embodiment, the method is:

[0056] S1. Add sodium chlorite a, glacial acetic acid a and distilled water to the larch pulp powder to obtain a pre-extraction solution, perform delignification treatment in a water bath at a temperature of 75°C, and add sodium chlorite b every 1 hour And glacial acetic acid b, add 2 times in total, carry out delignification treatment for 4 hours, obtain the lignocellulose primary extract, then vacuum filter, wash with deionized water until neutral, wash with acetone, at a temperature of 25 ℃ dry under the condition of dry, obtain the lignocellulose of water content≤10%; The addition amount of described sodium chlorite b every time is the same as the addition amount of sodium chlorite a in the described pre-extract; The glacial acetic acid b The supplementary amount each time is the same as the addition amount of glacial acetic acid a in the pre-e...

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Abstract

The invention provides a preparation method of a nanocellulose-based oxygen-isolating composite film. The method comprises the following steps: removing lignin from larch pulp powder to obtain lignocellulose, dissolving NaBr and tetramethylpiperidine oxide in a Na2CO3-NaHCO3 buffer solution, adding lignocellulose, dropwisely adding a NaClO solution, regulating the pH value, carrying out oxidationreaction, rinsing with deionized water, carrying out mechanical treatment, and obtaining carboxylated lignocellulose; adding deionized water and carboxylated lignocellulose into polyvinyl alcohol, mixing, and carrying out vacuum drying treatment to obtain a nanocellulose-based oxygen-isolating composite film, the mass ratio of polyvinyl alcohol to carboxylated lignocellulose being 3:7. The nano-cellulose-based oxygen isolation composite film prepared by the method has excellent oxygen isolation performance, and also has excellent water resistance and mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of oxygen-insulating composite films, and in particular relates to a preparation method of nano-cellulose-based oxygen-insulating composite films. Background technique [0002] In recent years, nanomaterials have attracted much attention in the field of high-performance products. As an environmentally friendly natural nanomaterial, nanocellulose has attracted more attention. Cellulose nanofibrils (TOCN) prepared by oxidation of tetramethylpiperidine oxide (TEMPO) have a large aspect ratio. , uniform width and individualized nano-dispersion characteristics, so it is easy to form a film. In addition, TOCN also has many unique properties, such as excellent mechanical properties and oxygen barrier properties, and has a good application prospect in the packaging field. However, due to the large amount of hydroxyl and carboxyl groups on the surface of TOCN, the TOCN film is easy to shrink after drying. In additi...

Claims

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Application Information

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IPC IPC(8): C08L97/02C08L29/04C08J5/18
CPCC08J5/18C08J2397/02C08J2429/04Y02W90/10
Inventor 黄金田刘洋汪昭奇张倩王宇苏日嘎拉
Owner INNER MONGOLIA AGRICULTURAL UNIVERSITY
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