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Method for preparing oxidized graphene coated film

A graphene film and graphene technology, applied in chemical instruments and methods, coatings, synthetic resin layered products, etc., can solve the problems of poor gas barrier properties of polymer films, and achieve excellent barrier properties, good transparency, and barrier properties. Sex-enhancing effect

Inactive Publication Date: 2011-09-07
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for preparing a graphene oxide coating film, which solves the problem of poor gas barrier properties of polymer films existing in the prior art

Method used

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  • Method for preparing oxidized graphene coated film
  • Method for preparing oxidized graphene coated film
  • Method for preparing oxidized graphene coated film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First add 4g of expandable graphite to 100ml of 98% concentrated H 2 SO 4 Stir in the mixture to obtain the mixture A; then add 28g KMnO to the mixture A while stirring 4 , after adding, stir at 38°C for 1 hour to obtain a homogeneous mixture B; then add 400ml of deionized water and 6ml of 30% H 2 o 2 , stir evenly to obtain mixture C; filter mixture C to obtain 40ml of paste, first wash with 60ml of 3.5% HCl solution, and then repeatedly wash with deionized water until the pH of the paste is 7, then use It was dispersed in 6000ml of deionized water by ultrasonic wave, and finally the dispersion was dehydrated at 60°C to obtain 6g of graphene oxide.

[0021] 0.2 g of graphene oxide was added to 200 ml of water, and stirred at 45° C. for 1 h while being ultrasonically treated (with a power of 400 W) to obtain a colloidal suspension of graphene oxide.

[0022] A graphene oxide film with a thickness of 0.8 μm is coated between two general-purpose polyethylene films: th...

Embodiment 2

[0027] First add 4.35g of expandable graphite to 100ml of 98% concentrated H 2 SO 4 Stir in the mixture to obtain the mixture A; then add 34.8g KMnO to the mixture A while stirring 4 , after adding, stir at 40°C for 1 hour to obtain a homogeneous mixture B; then add 450ml of deionized water and 8ml of 30% H 2 o 2 , stir evenly to obtain mixture C; filter mixture C to obtain 43.5ml of paste, first wash with 87ml of 3.5% HCl solution, and then repeatedly wash with deionized water until the pH of the paste is 7, then use It was dispersed in 6400ml of deionized water by ultrasonic wave, and finally the dispersion was dehydrated at 60°C to obtain 6.525g of graphene oxide.

[0028] 0.2 g of graphene oxide was added to 200 ml of water, and stirred at 30° C. for 1 h while being ultrasonically treated (with a power of 400 W) to obtain a colloidal suspension of graphene oxide.

[0029] A layer of graphene oxide film with a thickness of 1 μm is coated between a layer of general-purpo...

Embodiment 3

[0034] First add 4g of expandable graphite to 100ml of 98% concentrated H 2 SO 4 Stir in the mixture to obtain the mixture A; then add 24g KMnO to the mixture A while stirring 4 , after adding, stir at 40°C for 1 hour to obtain a homogeneous mixture B; then add 783ml of deionized water and 11ml of 30% H 2 o 2 , stir evenly to obtain mixture C; filter mixture C to obtain 40ml of paste, first wash with 40ml of 3.5% HCl solution, and then repeatedly wash with deionized water until the pH of the paste is 7, then use It was dispersed in 6000ml of deionized water by ultrasonic wave, and finally the dispersion was dehydrated at 60°C to obtain 6g of graphene oxide.

[0035] Add 0.2g of graphene oxide into 200ml of water, and stir at 20°C for 1 hour while ultrasonically treating (power 400W) to obtain a colloidal suspension of graphene oxide; the colloidal suspension of graphene oxide is densely coated on the On the surface of a layer of general-purpose polyvinyl alcohol film, the ...

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Abstract

The invention provides a method for preparing an oxidized graphene coated film, which comprises the following steps of: adding oxidized graphene into water, and performing ultrasonic treatment and stirring simultaneously to obtain colloid suspension of the oxidized graphene, wherein 1mg of oxidized graphene is added into 1mL of water; and coating the colloid suspension of the oxidized graphene onthe surface of a general film in a spraying or rolling mode, drying to form an oxidized graphene film, coating a plurality of layers, and after the uppermost oxidized graphene coating is dried to form a film, covering a layer of general film on the uppermost oxidized graphene film to obtain the oxidized graphene coated film. The method has the advantages that: the oxidized graphene coated film prepared by the method has good transparency, high safety, good environment friendliness, and excellent barrier property; the barrier property to CO2 gas is greatly improved particularly; and the methodis used for packaging foods and medicines with higher requirement on barrier property.

Description

technical field [0001] The invention belongs to the technical field of composite film preparation technology, and in particular relates to a preparation method of a graphene oxide coating film. Background technique [0002] With its excellent comprehensive properties, plastic products have been more and more widely used in food and pharmaceutical packaging as a substitute for glass and ceramics. However, the barrier performance of general-purpose plastic packaging materials is still difficult to meet the actual use requirements, and food and pharmaceuticals caused by poor packaging can be deteriorated or downgraded by 30-40%. Therefore, improving the barrier properties of packaging materials has always been a hot spot and focus of research in the packaging industry at home and abroad. In the current polymer barrier technology, nano-sheet fillers are used to fill polymer systems, using the good interface between polymers and fillers and the "multi-path effect" or "nano-barri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/06C08J7/06C01B31/04
Inventor 任鹏刚靳彦岭陈涛李忠明
Owner XIAN UNIV OF TECH
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