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Polyvinyl alcohol/graphene oxide composite film preparation method

A graphene composite and polyvinyl alcohol technology, applied in the field of preparation of polyvinyl alcohol/graphene oxide composite films, can solve problems such as poor oxygen barrier properties, achieve great practical and popularization value, good environmental protection, and simple process Effect

Active Publication Date: 2015-04-22
唐炜程
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method of polyvinyl alcohol / graphene oxide composite film, to solve the problem of poor oxygen barrier properties of polyvinyl alcohol / graphene oxide composite film prepared by existing methods

Method used

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  • Polyvinyl alcohol/graphene oxide composite film preparation method
  • Polyvinyl alcohol/graphene oxide composite film preparation method
  • Polyvinyl alcohol/graphene oxide composite film preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] First weigh 5g of expandable graphite and add it to 125ml of 98% concentrated H 2 SO 4 , stirred in an ice-water bath to prepare mixture a; then to mixture a, gradually add 20g KMnO 4 , the reaction was carried out at a temperature of 10°C for 2h, and then the reaction was continued for 1h in a constant temperature water bath at 35°C to obtain a mixture b; then 500ml of deionized water and 10ml of 30% H 2 o 2 , stir well and filter the mixture while hot to obtain a pasty mixture; wash the pasty mixture repeatedly with 40ml of 5% HCl solution and a large amount of deionized water until there is no SO in the filtrate 4 2- , and then disperse the pasty mixture in 3000ml of deionized water by ultrasonic action, and finally dry the dispersion at 50°C for 48h to obtain 7g of dry graphite oxide.

[0052] Take 0.1g of dry graphite oxide and add it to 100ml of deionized water, ultrasonicate at 25°C with an ultrasonic power of 100W, and stir for 2h to obtain a graphene oxide ...

Embodiment 2

[0059] First weigh 4g of expandable graphite and add it to 100ml of 98% concentrated H 2 SO 4 , stirred in an ice-water bath to prepare mixture a; then to mixture a, gradually add 18g KMnO 4 , the reaction was carried out at a temperature of 12°C for 2h, and then the reaction was continued for 1h in a constant temperature water bath at 35°C to obtain a mixture b; then 450ml of deionized water and 8ml of 30% H 2 o 2 , stir well and filter the mixture while hot to obtain a pasty mixture; wash the pasty mixture repeatedly with 35ml of 5% HCl solution and a large amount of deionized water until there is no SO in the filtrate 4 2- , and then disperse the pasty mixture in 2500ml of deionized water by ultrasonic action, and finally dry the dispersion at 40°C for 72h to obtain 6g of dry graphite oxide.

[0060] Add 0.05g of dry graphite oxide into 50ml of deionized water, ultrasonicate at 30°C with an ultrasonic power of 100W, and stir for 1.5h to obtain a graphene oxide colloidal...

Embodiment 3

[0063] First weigh 2g of expandable graphite and add it to 100ml of concentrated H2O with a concentration of 98%. 2 SO 4 , stirred in an ice-water bath to prepare mixture a; then to mixture a, gradually add 10g KMnO 4 , the reaction was carried out at a temperature of 15°C for 2h, and then the reaction was continued for 1h in a constant temperature water bath at 35°C to obtain a mixture b; then 400ml of deionized water and 5ml of 30% H 2 o 2 , stir well and filter the mixture while hot to obtain a pasty mixture; wash the pasty mixture repeatedly with 30ml of 5% HCl solution and a large amount of deionized water until there is no SO in the filtrate 4 2- , and then the pasty mixture was dispersed in 2000ml of deionized water by ultrasonic action, and finally the dispersion was dried at 45°C for 60h to obtain 3.4g of dry graphite oxide.

[0064] Add 0.025g of dry graphite oxide into 25ml of deionized water, ultrasonicate at 40°C with an ultrasonic power of 100W, and stir for ...

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Abstract

The invention discloses a polyvinyl alcohol / graphene oxide composite film preparation method. The method is carried out in the following steps: preparing a graphene oxide colloidal suspension liquid; preparing a polyvinyl alcohol and graphene oxide dispersion solution; coating a mould and non-isothermally drying; and demoulding so as to obtain a polyvinyl alcohol / graphene oxide composite film. A coating technology and a non-isothermally drying method are utilized to prepare the polyvinyl alcohol / graphene oxide composite film, the method has not only high safety but also good environment friendliness; moreover, the oxygen permeation coefficient of the composite film is reduced by 95.8 to the maximum extant, so that the composite film has ultrahigh oxygen barrier property and can satisfy the packaging requirements of various foods, pharmaceuticals and other products, and a problem that the polyvinyl alcohol / graphene oxide composite film prepared by the prior art has poor oxygen barrier property is solved; and the method is simple in technology and low in cost and has great application and popularization values.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, and in particular relates to a preparation method of a polyvinyl alcohol / graphene oxide composite film. Background technique [0002] In recent years, plastic packaging has been widely used in food and pharmaceutical packaging due to its excellent comprehensive properties. However, due to the poor barrier properties of general plastic packaging materials, the intermediate loss of products is as high as 30-50%. Therefore, the barrier properties of plastic packaging films should be improved. has become an urgent problem to be solved. In the technology of improving the barrier properties of plastic films, nano-sheet blending utilizes the good interfacial interaction between fillers and polymers and the multi-path effect or permeable area reduction effect of gas permeation caused by nano-sheet fillers in the polymer matrix. , to improve the barrier properties of the polymer matrix, which h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L29/04C08K9/02C08K3/04
Inventor 任鹏刚张华杨敬雄慈继豪
Owner 唐炜程
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