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A kind of method for preparing modified graphene polyvinyl alcohol composite film

A technology of polyvinyl alcohol and composite film, which is applied in the field of preparing modified graphene-polyvinyl alcohol composite film, which can solve the limitations of graphene/polyvinyl alcohol composite material research and application range, poor hydrophilicity and lipophilicity, Weak interaction and other problems, to achieve the effect of good chemical stability and biocompatibility, low price, and enhanced interface binding force

Active Publication Date: 2017-12-29
无锡市钱氏功能塑胶有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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  • A kind of method for preparing modified graphene polyvinyl alcohol composite film
  • A kind of method for preparing modified graphene polyvinyl alcohol composite film

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preparation example Construction

[0029] 1) Preparation of modified graphene: first disperse graphene oxide in deionized water, and stir at room temperature for 0.1-10 h with ultrasonic vibration to obtain a graphene oxide-water dispersion with a concentration of 0.01-1.0 mg / mL; then Add 7-amino-4-methylcoumarin to the graphene oxide-water dispersion, stir at 20-50°C for 0.1-5h; then add alkaline solution, stir for 0.1-5h, 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 prepare modified graphene by adding modifier and chemically reducing graphene oxide. In described graphene oxide, 7-amino-4-...

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 2 hours to obtain a graphene oxide-water dispersion with a concentration of 0.5 mg / mL;

[0042]Then add 7-amino-4-methylcoumarin to the graphene oxide-water dispersion, stir at 40°C for 1h; then add an aqueous sodium hydroxide solution with a concentration of 1.0 mol / L, stir for 1h, and Adjust the pH value to 9-10; then add the chemical reducing agent glucose, and react at 90°C for 24 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 60°C to obtain the modified graphene ;

[0044] The mass ratio of t...

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-amino-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 2.0 mol / L, stir for 0.5h, And adjust the pH value to 9-10; then add the chemical reducing agent vitamin C, and react at 95°C for 18 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 50°C to obtain the modified graphene ;

[0053] The mass ratio...

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Abstract

The invention discloses a method for preparing a modified graphene-polyvinyl alcohol composite film. The modifier of the invention is 7-amino-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 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 method for preparing 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, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L29/04C08K9/04C08K3/04
Inventor 黄杰陈俊良
Owner 无锡市钱氏功能塑胶有限公司
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