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The preparation method of polyvinyl alcohol-graphite oxide-fe3O4 composite film

A technology of polyvinyl alcohol and composite film, which is applied in the field of composite material preparation, and achieves the effects of high safety, good environmental protection, great practicality and promotional value

Active Publication Date: 2018-03-23
陕西正丰航天科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above studies are made of composite materials by casting or casting technology isothermal drying without external magnetic field, which improves the barrier properties of the material. So far, there is no preparation of high barrier film by casting technology isothermal drying method under the action of magnetic field. report

Method used

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  • The preparation method of polyvinyl alcohol-graphite oxide-fe3O4 composite film
  • The preparation method of polyvinyl alcohol-graphite oxide-fe3O4 composite film

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Step 1, add 4 g of expandable graphite to 100 ml of concentrated H 2 SO 4 , stirred in an ice-water bath; then gradually added 12g KMnO 4 , reacted at 12°C for 2h; then continued to react in a constant temperature water bath at 35°C for 1h, then added 400ml of deionized water and 8ml of 30% H 2 o 2 , stirred evenly and filtered while hot to obtain a paste mixture, which was first washed with 5% HCl solution, and then repeatedly washed with deionized water until there was no SO in the filtrate. 4 2- , and finally dried at 45°C for 48h to obtain graphite oxide;

[0032] Step 2, add 0.4g of graphite oxide into 400ml of deionized water for ultrasonic dispersion to obtain a graphite oxide dispersion, pass nitrogen into the graphite oxide dispersion and heat to 48°C, then add 80mg of FeCl 3 ·6H 2 O and 216 mg FeCl 2 4H 2 O, stirred for 25 minutes, then added 1mL of ammonia water dropwise, reacted at 40°C for 45min and cooled to room temperature, and finally the obtain...

Embodiment 2

[0035] Step 1, add 3 g of expandable graphite to 100 ml of concentrated H 2 SO 4 , stirred in an ice-water bath; then gradually added 12g KMnO 4 , reacted at 15°C for 2h; then continued to react for 1h in a constant temperature water bath at 38°C, and then added 600ml of deionized water and 5ml of 30% H 2 o 2 , stirred evenly and filtered while hot to obtain a paste mixture, which was first washed with 5% HCl solution, and then repeatedly washed with deionized water until there was no SO in the filtrate. 4 2- , and finally dried at 50°C for 48 hours to obtain graphite oxide;

[0036] Step 2, add 0.4g of graphite oxide into 400ml of deionized water for ultrasonic dispersion to obtain a graphite oxide dispersion, pass nitrogen into the graphite oxide dispersion and heat to 45°C, then add 90mg of FeCl 3 ·6H 2 O and 240 mg FeCl 2 4H 2 O, stirred for 20 minutes, then added 1.5mL of ammonia water dropwise, reacted at 35°C for 50min and cooled to room temperature, and finally...

Embodiment 3

[0039] Step 1, add 2 g of expandable graphite to 100 ml of concentrated H 2 SO 4 , stirred in an ice-water bath; then gradually added 10g KMnO 4 , reacted at 10°C for 2h; then continued to react for 1h in a constant temperature water bath at 40°C, and then added 800ml of deionized water and 10ml of 30% H 2 o 2 , stirred evenly and filtered while hot to obtain a paste mixture, which was first washed with 5% HCl solution, and then repeatedly washed with deionized water until there was no SO in the filtrate. 4 2- , and finally dried at 40°C for 48 hours to obtain graphite oxide;

[0040] Step 2, add 0.4g of graphite oxide into 400ml of deionized water for ultrasonic dispersion to obtain a graphite oxide dispersion, pass nitrogen into the graphite oxide dispersion and heat to 50°C, then add 100mg of FeCl 3 ·6H 2 O and 232mgFeCl 2 4H 2 O, stirred for 30 minutes, then added 2 mL of ammonia water dropwise, reacted at 50°C for 40 minutes and cooled to room temperature, and fin...

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Abstract

The invention discloses a preparation method of a polyvinyl alcohol-graphite oxide-Fe3O4 composite film. Dry graphite oxide-Fe3O4 is mixed with deionized water, ultrasonically dissociated and stirred to obtain a graphite oxide-Fe3O4 suspension; Adding polyvinyl alcohol aqueous solution to Fe3O4 suspension to obtain polyvinyl alcohol-graphite oxide-Fe3O4 dispersion solution; standing to remove the bubbles in the dispersion solution, pouring it into a PS mold, drying and demolding to obtain. The polyvinyl alcohol-graphite oxide-Fe3O4 nanocomposite film obtained by the preparation method of the present invention under the action of a magnetic field not only has high safety, but also has good environmental protection, and the oxygen permeability coefficient has decreased by 300 times, and has high oxygen barrier properties, which can meet various requirements. Packaging requirements for food, pharmaceuticals and other products. The preparation process is simple, the safety is high, the cost is low, and it has great practical and popularization value.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, in particular to a polyvinyl alcohol-graphite oxide-Fe 3 o 4 Preparation method of composite film. Background technique [0002] In recent years, plastic packaging has been widely used in food and pharmaceutical packaging due to its excellent comprehensive performance. However, the intermediate loss of the product is as high as 30-50% due to the poor barrier properties of common plastic packaging materials. Therefore, improving the barrier properties of plastic packaging films has become an urgent problem to be solved. In the technology of improving the barrier properties of plastic films, nano-sheet blending is to use the good interfacial interaction between fillers and polymers and the "multi-path effect" or "permeable area" of gas permeation caused by nano-sheet fillers in the polymer matrix. "Reducing effect" to improve the barrier properties of the polymer matrix h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K3/22C08J5/18C08L29/04C08K3/04
Inventor 任鹏刚肖志超王浩斌
Owner 陕西正丰航天科技有限公司
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