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A kind of preparation method of modified graphene-chitosan composite film

A composite film and graphene technology, which is applied in the field of preparation of modified graphene-chitosan composite film, can solve the limitations of graphene-chitosan composite material research and application range, poor hydrophilicity and lipophilicity, Weak interaction and other problems, to achieve excellent biofunctionality and compatibility, low price, and enhance the effect of interfacial binding force

Active Publication Date: 2018-03-27
芽米科技(广州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface of graphene is in an inert state, the interaction with other media is weak, and there is a strong van der Waals force between graphene sheets, resulting in poor hydrophilicity and lipophilicity, which makes it in the shell The polysaccharide matrix has poor dispersion and is easy to agglomerate, so it cannot be well compounded with the polymer matrix, which greatly limits the further research and application range of graphene-chitosan composites

Method used

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  • A kind of preparation method of modified graphene-chitosan composite film
  • A kind of preparation method of modified graphene-chitosan composite film

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preparation example Construction

[0027] One, a kind of preparation method of modified graphene-chitosan composite film, comprises the steps:

[0028] 1) Preparation of modified graphene: first disperse graphene oxide in deionized water, and stir at room temperature for 0.5-12 hours with ultrasonic vibration to obtain a graphene oxide-water dispersion with a concentration of 0.01-2.0 mg / mL; then Add 7-hydroxy-4-methylcoumarin to the graphene oxide-water dispersion, stir at 20-60°C for 0.1-10h; then add alkaline solution, stir for 0.1-10h, and adjust the pH to 9-10; then add a chemical reducing agent, react at 60-100°C for 12-96h to obtain a modified mixed solution; filter the modified mixed solution to obtain a solid substance, and then wash the said modified mixed solution with ethanol and deionized water in sequence Solid matter to neutral; placed in the atmosphere or in a vacuum environment, dried at 40-80°C to constant weight to obtain modified graphene.

[0029] The operation of this step is to prepare m...

Embodiment 1

[0039] Adopt the following method to prepare modified graphene-chitosan composite film:

[0040] 1) Preparation of modified graphene: disperse graphene oxide in deionized water first, and ultrasonically shake and stir at room temperature for 5 hours to obtain a graphene oxide-water dispersion with a concentration of 0.05 mg / mL.

[0041]Then add 7-hydroxy-4-methylcoumarin to the graphene oxide-water dispersion, stir at 25°C for 3h; then add an aqueous sodium hydroxide solution with a concentration of 0.2 mol / L, stir for 1h, and Adjust the pH value to 9-10; then add the chemical reducing agent hydrazine hydrate, react at 85° C. for 18 hours to obtain the modified mixed solution.

[0042] Suction filter the modified mixed solution to obtain a solid substance, and then wash the solid substance with ethanol and deionized water to neutrality; place it in a vacuum environment, and dry it to a constant weight at 50°C to obtain the modified graphene .

[0043] The mass ratio of graph...

Embodiment 2

[0048] Adopt the following method to prepare modified graphene-chitosan composite film:

[0049] 1) Preparation of modified graphene: disperse graphene oxide in deionized water first, and stir it with ultrasonic vibration at room temperature for 8 hours to obtain a graphene oxide-water dispersion with a concentration of 0.1 mg / mL;

[0050] Then add 7-hydroxy-4-methylcoumarin to the graphene oxide-water dispersion, stir at 30°C for 5h; then add an aqueous sodium hydroxide solution with a concentration of 0.5mol / L, stir for 3h, and Adjust the pH value to 9-10; then add the chemical reducing agent vitamin C, and react at 90°C for 24 hours to obtain the modified mixed solution;

[0051] Suction filter the modified mixed solution to obtain a solid substance, and then wash the solid substance with ethanol and deionized water to neutrality; place it in an atmospheric environment, and dry it to a constant weight at 60°C to obtain the modified graphene ;

[0052] The mass ratio of th...

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Abstract

The invention discloses a preparation method of a modified graphene-chitosan composite film. The modifier of the invention is 7-hydroxy-4-methylcoumarin, and the invention is hydrazine hydrate, vitamin C or glucose, etc. Chemical reducing agent; first prepare modified graphene, then prepare the dispersion of modified graphene, then add the dispersion of modified graphene to chitosan acetic acid solution to obtain uniformly dispersed modified graphene-chitosan Sugar mixed solution; finally, the above mixed solution is poured into a container, and dried at 40-80 degrees Celsius to constant weight in the atmosphere or in a vacuum environment to obtain a modified graphene / chitosan composite film. Wherein, the mass fraction of modified graphene is 0.1%-15%. The invention has the advantages of simple preparation, mild reaction conditions, easy operation and control, and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer composite material preparation, and in particular relates to a preparation method of a modified graphene-chitosan composite film. Background technique [0002] Chitosan, also known as polyglucosamine (1-4)-2-amino-B-D glucose, is a natural polymer obtained by de-N-acetylation of chitin, which has excellent biological functionality and Compatibility, microbial degradability and other excellent properties make chitosan and its composite materials widely used in the fields of biology, medicine, chemical industry and food. [0003] Graphene is a new type of two-dimensional nanocarbon material with excellent electrical, mechanical and thermal properties. Therefore, adding it to polymers as a nanofiller component can effectively improve the electrical, mechanical and thermal properties of polymers. thermal performance. Therefore, this method will become a research hotspot and focus in the field of pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L5/08C08K9/04C08K3/04C08J5/18
Inventor 黄杰陈雨
Owner 芽米科技(广州)有限公司
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