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Preparation method of chitosan membrane

A technology of chitosan film and chitosan, applied in the field of preparation of chitosan film, can solve the problem of low mechanical strength of chitosan film

Inactive Publication Date: 2015-09-23
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Because there are a large amount of hydrogen bonds in and between chitosan molecules, resulting in the compact structure and strong rigidity of chitosan itself, at present, the existing patented film-forming technology (such as, CN03118535. 2) The mechanical strength of gained chitosan film is all very low, therefore, how to improve film-making process technology is the key problem of preparing high-performance chitosan film

Method used

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  • Preparation method of chitosan membrane

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Experimental program
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Effect test

Embodiment 1

[0017] Prepare 1.5% 1-carboxymethyl-3-methylimidazolium chloride salt ionic liquid aqueous solution 50g, 0.75g chitosan is completely dissolved in the above-mentioned solvent, make the chitosan film-making stoste that concentration is 1.5%, through Squeeze and filter, stand for defoaming, spin coating on glass plate, dry at 50% constant temperature at 40°C and constant humidity, soak in 2.0% sodium hydroxide solution for 2.5h to remove the film, wash with distilled water until neutral, and keep at constant temperature at 40°C and constant humidity 50% drying and other operations to obtain a transparent chitosan film, the thickness of which is 3.35 μm, the breaking strength is 171 MPa, the breaking elongation is 3.97%, and the initial modulus is 3.39 GPa.

Embodiment 2

[0019] Prepare 2.0% 1-carboxymethyl-3-methylimidazolium chloride salt ionic liquid aqueous solution 50g, 1.25g chitosan is completely dissolved in the above-mentioned solvent, make the chitosan membrane stock solution that concentration is 2.5%, through Squeeze and filter, stand for defoaming, spin coating on glass plate, dry at 50% constant temperature at 40°C and constant humidity, soak in 1.5% sodium hydroxide solution for 3.5h to remove the film, wash with distilled water until neutral, and keep at constant temperature at 40°C and constant humidity 50% drying, etc., to obtain a transparent chitosan film with a thickness of 3.22 μm, a breaking strength of 177 MPa, a breaking elongation of 4.01%, and an initial modulus of 3.47 GPa.

Embodiment 3

[0021] Prepare 3.0% 1-carboxymethyl-3-methylimidazolium chloride salt ionic liquid aqueous solution 50g, 1.0g chitosan is completely dissolved in the above-mentioned solvent, make the chitosan membrane stock solution that concentration is 2.0%, through Squeeze and filter, stand for defoaming, spin coating on glass plate, dry at 50% constant temperature and humidity at 40°C, soak in 2.0% sodium hydroxide solution for 3.0h to remove the film, wash with distilled water until neutral, and keep at constant temperature and humidity at 40°C 50% drying and other operations to obtain a transparent chitosan film with a thickness of 3.14 μm, a breaking strength of 180 MPa, a breaking elongation of 3.92%, and an initial modulus of 3.54 GPa.

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Abstract

The invention discloses a preparation method of a chitosan membrane. The method comprises the following steps of: dissolving chitosan in 1-carboxymethyl-3-methyl chlorine salt ion liquid water solution of 1-5%, and enabling the chitosan to completely dissolve so as to obtain a stock solution of 1-5 wt% for preparing the chitosan membrane; performing squeezing and filtering; performing standing and defoaming; performing rotary membrane coating on a glass plate; performing drying under constant temperature of 40 DEG C and constant humidity of 50%; performing soaking in a sodium hydroxide solution of 1-5% for 1-5h and stripping a membrane; cleaning the membrane in distilled water till the pH is neutral; and drying the cleaned membrane under the constant temperature of 40 DEG C and constant humidity of 50% so as to obtain the chitosan membrane. According to the chitosan membrane, the thickness is 2.5-3.5 mu m, the breaking strength is larger than or equal to 170MPa, the elongation at break is larger than 3.6%, and the initial modulus is larger than 3.3 GPa. The chitosan membrane can be used as anticoagulant materials, bone repairing materials, wound dressing materials, and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of membrane materials, and in particular relates to a method for preparing chitosan membranes. The method overcomes the disadvantages of easy volatilization of solvents, serious pollution, and large amount of three wastes in the preparation process of chitosan membranes. Specifically, It is said to use high molecular weight chitosan as raw material and the aqueous solution of 1-carboxymethyl-3-methylimidazolium chloride salt ionic liquid as solvent to prepare a suitable concentration of film-making liquid; After soaking to remove the film, constant temperature and humidity drying and other processes, the chitosan film is finally obtained. Background technique [0002] Chitosan is a natural polymer biomass resource, which widely exists in marine organisms such as shrimps, crabs and other arthropods, molluscs and fungal cells, and is known as animal cellulose. Chitosan film is made of chitosan ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L5/08
Inventor 于世涛李露刘仕伟刘福胜解从霞赵丽丽
Owner QINGDAO UNIV OF SCI & TECH
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