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A kind of lignin/cellulose composite film and preparation method thereof

A composite film and lignin technology, which is applied in the field of lignin/cellulose composite film and its preparation, can solve the difficult problems of improving toughness and strength at the same time, achieve the improvement of strength and toughness, green and convenient cellulose performance, and improve cellulose performance effect

Active Publication Date: 2022-02-22
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that it is difficult to simultaneously improve toughness and strength in the process of improving the compatibility of lignin / cellulose composite films in the prior art, the present invention provides a lignin / cellulose composite film and its preparation method

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0023] On the other hand, the present invention provides a kind of preparation method of lignin / cellulose composite film, described method comprises the following steps:

[0024] (1) dissolving the lignin powder in an acetone solution, centrifuging to remove the precipitate, and obtaining a lignin acetone solution;

[0025] (2) configure cellulose solution, obtain cellulose solution after ultrasonic treatment, and obtain ultrasonic cellulose paper after drying;

[0026] (3) zinc chloride is dissolved in distilled water to obtain a zinc chloride solution;

[0027] (4) soaking the ultrasonic cellulose paper of step (2) in the zinc chloride solution in step (3), soaking in step (1) lignin / acetone solution after washing;

[0028] (5) hot pressing the ultrasonic cellulose paper impregnated with the lignin / acetone solution in step (4), and cooling the obtained lignin / cellulose composite film.

[0029] The mass fraction of the cellulose solution configured in the step (2) is 0.5%-1...

Embodiment 1

[0040] 1. Dissolve 4.0 grams of lignin powder in 150 milliliters of acetone solution, keep stirring for 10 minutes, then sonicate for 1 hour with a power of 600 watts, and finally centrifuge the solution at a speed of 5000 rpm for 8 minutes to remove the precipitate and obtain 30 mg / ml of lignin in acetone;

[0041] 2. Configure a cellulose solution with a mass fraction of 0.5%, and then use 800W power to sonicate for 6 hours to obtain an ultrasonic cellulose solution;

[0042] 3. Weigh 100 grams of ultrasonically treated cellulose solution for vacuum filtration, then squeeze water on a flattener, and finally heat-press and dry at 110°C for 30 minutes under a pressure of 8 MPa to obtain ultrasonic cellulose paper;

[0043] 4. Dissolve 15-30 grams of zinc chloride in 100 grams of distilled water, then add 20 grams of hydrochloric acid solution with a mass fraction of 1% to prevent hydrolysis and precipitation of zinc chloride, and configure it into a zinc chloride solution;

...

Embodiment 2

[0048] 1. Dissolve 6.0 grams of lignin powder in 200 ml of acetone solution, keep stirring for 15 minutes, then ultrasonicate for 1 hour with a power of 600 watts, and finally centrifuge the solution at a speed of 5000 rpm for 10 minutes to remove the precipitate and obtain 30 mg / ml of lignin in acetone;

[0049] 2. Prepare a cellulose solution with a mass fraction of 1%, and then use 800W power to sonicate for 6 hours to obtain an ultrasonic cellulose solution;

[0050] 3. Weigh 100 grams of ultrasonically treated cellulose solution for vacuum filtration, then squeeze water on a flattener, and finally heat-press and dry at 120°C for 60 minutes under a pressure of 3MPa to obtain ultrasonic cellulose paper;

[0051] 4. Dissolve 30 grams of zinc chloride in 200 grams of distilled water, then add 30 grams of hydrochloric acid solution with a mass fraction of 1% to prevent hydrolysis and precipitation of zinc chloride, and configure it into a zinc chloride solution;

[0052]5. Th...

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Abstract

The invention relates to the field of film preparation, and discloses a lignin / cellulose composite film and a preparation method thereof. % of zinc chloride. The method comprises (1) dissolving lignin powder in an acetone solution to obtain a lignin acetone solution; (2) configuring a cellulose solution, obtaining a cellulose solution after ultrasonic treatment, and obtaining an ultrasonic cellulose paper after drying; (3) Zinc chloride is dissolved in distilled water, obtains zinc chloride solution; (4) the ultrasonic cellulose paper of step (2) is immersed in the zinc chloride solution in step (3), after washing, in step (1) wooden (5) heat-press the ultrasonic cellulose paper impregnated with lignin / acetone solution in step (4), and obtain the lignin / cellulose composite film after cooling. The strength and toughness of the effective lignin and cellulose composite film of the present invention have the advantages of simple operation and low cost.

Description

technical field [0001] The invention belongs to the field of film preparation, and more specifically relates to a lignin / cellulose composite film and a preparation method thereof. Background technique [0002] Cellulose is the natural polymer with the largest reserves on the earth, which has the advantages of good mechanical properties, non-toxic and degradable. However, the hydrophilicity and lack of multifunctionality of cellulose limit its wider application. As another natural polymer with huge reserves, lignin has the advantages of non-toxicity, good water resistance, UV resistance, and good thermal stability, which can well make up for the defects of cellulose. Due to the poor compatibility of lignin and cellulose recombination, the current methods to improve the compatibility of lignin and cellulose are mainly limited to chemical modification and other methods. However, on the one hand, chemical modification is expensive, on the other hand, it will produce toxic subs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H27/00D21H23/22B31F1/00
CPCD21H27/00D21H23/22B31F1/00
Inventor 王伟宏刘亮先崔博宇谭磊刘朝栋
Owner NORTHEAST FORESTRY UNIVERSITY