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Hemicellulose/chitosan based compound membrane with high flexibility and mechanical strength and preparation method thereof

A technology of hemicellulose and mechanical strength, applied in the field of hemicellulose/chitosan-based composite membrane and its preparation, can solve the problems of membrane permeability and tensile strength, and achieve high mechanical strength, good application prospect, The effect of high flexibility

Inactive Publication Date: 2019-06-28
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is worth noting that although the flexibility of the membrane is improved, the permeability and tensile strength of the membrane are also affected by the plasticizer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1: Prepare chitosan solution: first weigh 1g of acetic acid, add 99ml of deionized water to obtain a 1% acetic acid solution, then accurately weigh 1g of chitosan dissolved in 49g of 1% acetic acid solution , heated and stirred at 40°C until the chitosan was completely dissolved to obtain a clear and transparent chitosan solution with a mass fraction of 2%.

[0020] Step 2: Prepare hemicellulose solution: first weigh 2g of acetic acid, add 98ml of deionized water to obtain a 2% acetic acid solution, then accurately weigh 1g of hemicellulose dissolved in 49g of 2% acetic acid solution , heated and stirred at 60°C until the hemicellulose was almost completely dissolved, and a small amount of undissolved part was removed by centrifugation to obtain a clear and transparent hemicellulose solution with a mass fraction of about 2%.

[0021] Step 3: prepare hemicellulose / chitosan composite membrane film-forming solution: the chitosan solution that step 1 is made and the xy...

Embodiment 2

[0025] Step 1: Prepare chitosan solution: first weigh 1g of acetic acid, add 99ml of deionized water to obtain a 1% acetic acid solution, then accurately weigh 1g of chitosan dissolved in 49g of 1% acetic acid solution , heated and stirred at 40°C until the chitosan was completely dissolved to obtain a clear and transparent chitosan solution with a mass fraction of 2%.

[0026] Step 2: Prepare hemicellulose solution: first weigh 2g of acetic acid, add 98ml of deionized water to obtain a 2% acetic acid solution, then accurately weigh 1g of hemicellulose dissolved in 49g of 2% acetic acid solution , heated and stirred at 60°C until the hemicellulose was almost completely dissolved, and a small amount of undissolved part was removed by centrifugation to obtain a clear and transparent hemicellulose solution with a mass fraction of about 2%.

[0027] Step 3: prepare hemicellulose / chitosan composite membrane film-forming solution: the chitosan solution that step 1 is made and the xy...

Embodiment 3

[0031] Step 1: Prepare chitosan solution: first weigh 1g of acetic acid, add 99ml of deionized water to obtain a 1% acetic acid solution, then accurately weigh 1g of chitosan dissolved in 49g of 1% acetic acid solution , heated and stirred at 40°C until the chitosan was completely dissolved to obtain a clear and transparent chitosan solution with a mass fraction of 2%.

[0032] Step 2: Prepare hemicellulose solution: first weigh 2g of acetic acid, add 98ml of deionized water to obtain a 2% acetic acid solution, then accurately weigh 1g of hemicellulose dissolved in 49g of 2% acetic acid solution , heated and stirred at 60°C until the hemicellulose was almost completely dissolved, and a small amount of undissolved part was removed by centrifugation to obtain a clear and transparent hemicellulose solution with a mass fraction of about 2%.

[0033] Step 3: prepare hemicellulose / chitosan composite membrane film-forming solution: the chitosan solution that step 1 is made and the xy...

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Abstract

The invention discloses a method for preparing a hemicellulose / chitosan based compound membrane with high flexibility and mechanical strength. The method comprises the following steps: (1) dissolvingchitosan in an acetic acid solution, heating and stirring to prepare a chitosan solution; (2) dissolving hemicellulose in an acetic acid solution, heating and stirring to prepare a hemicellulose solution; (3) mixing the hemicellulose solution and the chitosan solution, and adding a cellulose nano-fiber solution; (4) adding plasticizer into the mixed solution, stirring the mixed solution at room temperature, centrifuging to remove insoluble impurities, performing ultrasonic degassing, and standing to obtain a compound membrane-forming solution; and (5) putting the membrane-forming solution in aculture dish, drying in a vacuum drying tank to form a membrane. The hemicellulose / chitosan based compound membrane has relatively high flexibility, relatively high tensile strength and relatively good oxygen resistance, is antibacterial and antioxidative, and has a relatively good application prospect in food package, oxidation resistance and other aspects.

Description

technical field [0001] The invention relates to the technical field of biomass resource utilization and the field of polymer membrane materials, in particular to a hemicellulose / chitosan-based composite membrane with high flexibility and mechanical strength and a preparation method thereof. Background technique [0002] Packaging materials are critical to extending the shelf life of foods, controlling moisture and gas exchange, and reducing the rate of oxidation reactions. Most of the packaging materials currently used are non-renewable resources, such as petroleum-based polymers, which not only cause waste of resources, but also bring serious environmental problems. Bio-based polymers are renewable, biodegradable and environmentally friendly, making them ideal materials to replace petroleum-based polymers. At present, the use of bio-based polymers such as polysaccharides, proteins, lipids, etc. to prepare packaging film materials is favored by people. Among various film-f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L5/08C08L5/14C08L1/02C08K5/053
Inventor 孙润仓袁同琦徐吉远曹学飞孙少妮
Owner BEIJING FORESTRY UNIVERSITY
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