Preparation method and application of high-toughness and high-transparency heat-sealable cellulose membrane

A cellulose film, high toughness technology, applied in the direction of sustainable manufacturing/processing, sustainable packaging, climate sustainability, etc., can solve the problems of cumbersome steps, not completely degradable, etc., and achieve the effect of simple process

Pending Publication Date: 2022-05-27
ZHEJIANG SCI-TECH UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The patent document with the application number 202110402446.7 discloses a production method of heat-sealable food packaging paper, which uses a film transfer sizing method to apply a surface sizing agent with waterproof, oil-proof and heat-sealing properties to the paper Produce heat-sealable food packaging paper on the surface. Although the product is made into bags or boxes by heat-sealing with a heat-sealing machine, the steps are cumbersome and not completely degradable, which still needs further improvement.

Method used

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  • Preparation method and application of high-toughness and high-transparency heat-sealable cellulose membrane
  • Preparation method and application of high-toughness and high-transparency heat-sealable cellulose membrane
  • Preparation method and application of high-toughness and high-transparency heat-sealable cellulose membrane

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preparation example Construction

[0030] The specific steps of a method for preparing a high-toughness and high-transparency heat-sealable cellulose film are as follows:

[0031] (1) Dissolve a certain quality of plant fiber in a certain concentration of chloride salt solution, stir at a constant speed at a certain temperature to dissolve, until it is in a transparent light yellow viscous state;

[0032] (2) Prepare a certain proportion of mixed plasticizer, stir and mix at a certain temperature to a flowing state, and blend with the cellulose solution in an appropriate proportion to obtain a mixed solution;

[0033] (3) Pour the mixed solution into the film maker for film coating, select the appropriate thickness for the film maker, and scrape and coat the film on the glass plate;

[0034] (4) Immediately after scraping, it is placed in a certain volume of coagulation bath, and the organic solvent is replaced for an appropriate time;

[0035] (5) Replace the organic solvent in step (4), and continue to repla...

Embodiment 1

[0042] The preparation method of the high-toughness and high-transparency heat-sealable cellulose film of the present embodiment includes:

[0043] (1) Dissolve 0.8 g of cotton fiber in a 70% zinc chloride solution, and stir at a constant speed at 90 °C to dissolve until it is in a transparent light yellow viscous state;

[0044] (2) The mass ratio of glycerol and sorbitol is 2:1, the mass ratio of the total amount of glycerol and sorbitol to the cellulose film solution system is 15%, and the mixture is stirred and mixed at 90 °C until it is in a flowing state, and mixed with cellulose. The solution is blended to obtain a mixed solution;

[0045] (3) Pour the mixed solution into the film maker for film coating. The film maker is selected with a thickness of 750 µm, and the film is formed by scraping on the glass plate;

[0046] (4) Immediately after scraping, put it into 500 mL of ethanol for 30 min of organic solvent replacement;

[0047] (5) Replace the organic solvent in ...

Embodiment 2

[0050](1) Dissolve 0.8 g of flax fiber in a zinc chloride solution with a mass fraction of 70%, and stir at a constant speed at 70 °C to dissolve until it is in a transparent pale yellow viscous state;

[0051] (2) The mass ratio of glycerol and sorbitol is 2:1, and the mass ratio of the total amount of glycerol and sorbitol to the cellulose film solution system is 10%. Stir and mix at 80 °C to a flowing state, and mix with cellulose. The solution is blended to obtain a mixed solution;

[0052] (3) Pour the mixed solution into the film maker for film coating. The film maker is selected with a thickness of 250 µm, and the film is formed by scraping on the glass plate;

[0053] (4) Immediately after scraping, put it into 500 mL of organic ethanol for 30 min of organic solvent replacement;

[0054] (5) Replace the organic solvent in step (4), and continue to replace the organic solvent in 250 mL of ethanol for 5 min, so that the residual salt mass ratio of the cellulose membrane...

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Abstract

The invention belongs to the field of preparation of heat-sealable packaging materials, and particularly relates to a preparation method of a high-toughness and high-transparency heat-sealable cellulose film, which comprises the following steps: (1) dissolving cellulose: preparing a chlorate solution, adding plant fibers after the chlorate solution reaches a transparent solution state at a proper temperature, and dissolving the plant fibers; (2) blending: after the plant fibers are completely dissolved, adding a plasticizer to fully blend the plant fibers; (3) coating; (4) solvent replacement: after coating, immersing into a coagulating bath for organic solvent replacement, so that the residual salt amount is kept in a fixed concentration range; and (5) air drying. The cellulose membrane prepared by the method can be completely degraded, is good in biocompatibility, has the characteristics of high transparency and high toughness, can be thermally bonded at a relatively low temperature, and expands the application scenes of the cellulose membrane in different industries such as food and cosmetics.

Description

technical field [0001] The invention belongs to the field of preparation of heat-sealable packaging materials, in particular to a preparation method of a high-toughness and high-transparency heat-sealable cellulose film. Background technique [0002] In the context of the accelerated national plastic ban and carbon reduction actions, packaging materials such as plastics have been gradually banned due to the depletion of petroleum resources, serious environmental pollution and non-degradable reasons. Countries around the world are actively looking for an alternative to plastic. Degradable material. As a class of natural polymer materials with a wide range of sources, good biocompatibility and degradability, cellulose plays an important role in many green and renewable energy sources. The annual global natural output can reach 150 billion tons. The tightly combined hydrogen bonds between the molecular chains lead to the fatal defects of cellulose being insoluble and not havin...

Claims

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Application Information

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IPC IPC(8): C08L97/02C08K5/053C08J5/18
CPCC08J5/18C08J2397/02C08K5/053Y02W90/10
Inventor 余厚咏沈云飞黄程玲陈祥沈昕洢沈家源
Owner ZHEJIANG SCI-TECH UNIV
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