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A kind of preparation method of modified graphene polyvinyl alcohol composite film

A polyvinyl alcohol and composite film technology, which is applied in the field of preparation of modified graphene-polyvinyl alcohol composite films, can solve the problem of limiting the research and application scope of graphene-polyvinyl alcohol composite materials, poor hydrophilicity and lipophilicity , weak interaction and other problems, to achieve the effect of good chemical stability and biocompatibility, low price, and enhanced interfacial bonding force

Active Publication Date: 2017-09-22
佛山市粤远成包装制品有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface of graphene is in an inert state, and 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 suitable for polymers. The dispersion in the vinyl alcohol matrix is ​​poor and easy to agglomerate, so it cannot be well compounded with the polymer matrix, which greatly limits the further research and application range of graphene-polyvinyl alcohol composites

Method used

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  • A kind of preparation method of modified graphene polyvinyl alcohol composite film
  • A kind of preparation method of modified graphene polyvinyl alcohol composite film

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preparation example Construction

[0028] One, a kind of preparation method of modified graphene-polyvinyl alcohol composite film, comprises the steps:

[0029] 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 0.1-6h; then add alkaline solution, stir for 0.1-6h, and adjust the pH to 9-10; then add a chemical reducing agent, react at 60-95°C for 12-96h to obtain a modified mixed solution; suction filter the modified mixed solution to obtain a solid substance, and then wash the described mixed solution with ethanol and deionized water in sequence Solid matter to neutral; placed in the atmosphere or in a vacuum environment, dried at 40-70°C to constant weight to obtain modified graphene.

[0030] The operation of this step is to...

Embodiment 1

[0040] Adopt the following method to prepare modified graphene-polyvinyl alcohol composite film:

[0041] 1) Preparation of modified graphene: first disperse graphene oxide in deionized water, and ultrasonically shake and stir at room temperature for 1 hour to obtain a graphene oxide-water dispersion with a concentration of 0.05 mg / mL;

[0042]Then add 7-hydroxy-4-methylcoumarin to the graphene oxide-water dispersion, stir at 25°C for 2h; then add an aqueous sodium hydroxide solution with a concentration of 1.0 mol / L, stir for 0.5h, And adjust the pH value to 9-10; then add the chemical reducing agent hydrazine hydrate, and react at 80°C for 48 hours to obtain the modified mixed solution;

[0043] 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 50°C to obtain the modified graphene ;

[0044] The m...

Embodiment 2

[0049] Adopt the following method to prepare modified graphene-polyvinyl alcohol composite film:

[0050] 1) Preparation of modified graphene: first disperse graphene oxide in deionized water, and ultrasonically shake and stir at room temperature for 3 hours to obtain a graphene oxide-water dispersion with a concentration of 0.1 mg / mL;

[0051] Then add 7-hydroxy-4-methylcoumarin to the graphene oxide-water dispersion, stir at 30°C for 1h; then add an aqueous sodium hydroxide solution with a concentration of 2.0 mol / L, stir for 1h, and Adjust the pH value to 9-10; then add the chemical reducing agent vitamin C, and react at 90°C for 32 hours to obtain the modified mixed solution;

[0052] 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 ;

[0053] The mass ratio...

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Abstract

The invention discloses a preparation method of a modified graphene-polyvinyl alcohol 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 polyvinyl alcohol aqueous solution to obtain uniformly dispersed modified graphene-polyvinyl alcohol Mixed solution; finally, pour the mixed solution into a container, and dry it at 40-70 degrees Celsius to a constant weight in the atmosphere or in a vacuum environment to obtain a modified graphene / polyvinyl alcohol composite film. Wherein, the mass fraction of modified graphene is 0.1%-10%. 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-polyvinyl alcohol composite film. Background technique [0002] Polyvinyl alcohol (PVA) is a water-soluble polymer obtained by hydrolyzing polyvinyl acetate. It has excellent hydrophilicity and film-forming properties, and also has good chemical stability and biocompatibility. It is safe and non-toxic ,multiple usage. However, polyvinyl alcohol itself has low strength and poor heat resistance, which limits the application of polyvinyl alcohol and its composite materials in many fields. [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, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08K9/04C08K3/04C08J5/18
Inventor 黄杰沈政
Owner 佛山市粤远成包装制品有限公司
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