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Method for preparing high-barrier graphene oxide-polyethylene nano composite film

A high-barrier, nano-composite technology, applied in chemical instruments and methods, lamination, coating, etc., can solve the problems of difficult combination of nano-filler and polymer matrix interface, limited application range, and uncontrollable film thickness. Achieve the effects of wide practicability and promotion value, high safety, and ultra-high oxygen barrier property

Active Publication Date: 2014-07-02
上海追得新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, layered nanofiller composite is the focus of attention in recent years. This system is based on the good interfacial interaction between polymer and filler and the "multipath effect" or "nano-barrier effect" of gas permeation caused by nanosheet filler in the polymer matrix. "wall effect" to effectively improve the barrier properties of the polymer matrix. Although this method has many advantages such as convenient processing and high product cost performance, it also has the problem that the interface between the nanofiller and the polymer matrix is ​​not easy to combine, and its film thickness is also uncontrollable. , which limits the application range of the technique

Method used

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  • Method for preparing high-barrier graphene oxide-polyethylene nano composite film
  • Method for preparing high-barrier graphene oxide-polyethylene nano composite film
  • Method for preparing high-barrier graphene oxide-polyethylene nano composite film

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preparation example Construction

[0023] The preparation method of the high barrier graphene oxide-polyethylene nanocomposite film of the present invention, concrete steps are as follows:

[0024] Step 1, modified Hummer method prepares graphene oxide

[0025] First weigh 3~5g K 2 S 2 o 8 , 3~5g P 2 o 5 Mix with 5~7g of graphite powder, then add 20~30ml of concentrated sulfuric acid and stir at 75~85°C for 4~5h, then cool to room temperature, add 1~1.5L of distilled water and stir for 12~14 hours, use 0.4~0.5 Filter with microporous filter paper of μm to remove some residual acid, and dry the product for 24-30 hours to obtain pre-oxidized graphite;

[0026] Add pre-oxidized graphite to 240-250ml concentrated sulfuric acid, stir continuously and add 25-35g KMnO in ice bath 4 , Stir at 30-40°C for 2-3 hours, add 450-550ml distilled water to dilute, continue stirring for 1-2 hours, then add 1-1.5L distilled water, continue stirring, and finally add 40-50ml, 25-35% H 2 o 2 Continue stirring the solution un...

Embodiment 1

[0036] Step 1, the preparation of graphene oxide

[0037] First weigh 5g K 2 S 2 o 8 , 5g P 2 o 5 Mix with 6g of graphite powder, then add 25ml of concentrated sulfuric acid and stir at 80°C for 5 hours, then cool to room temperature, add 1L of distilled water and stir for 12 hours, filter with 0.45μm microporous filter paper to remove the remaining part of the acid, the The product was dried for 24 hours to obtain pre-oxidized graphite;

[0038] Add pre-oxidized graphite to 250ml concentrated sulfuric acid, stir constantly and add 30g KMnO in ice bath 4 , stirred at 40°C for 2 hours, then added 500ml of distilled water to dilute, continued to stir for 2 hours, then added 1.5L of distilled water, continued to stir, and finally added 40ml of 30% H 2 o 2 The solution was continuously stirred until the solution was light yellow, filtered, washed, and dried in a vacuum at 60° C. to obtain graphite oxide;

[0039] Dissolve graphite oxide in 150ml of distilled water and ultr...

Embodiment 2

[0049] Step 1, the preparation of graphene oxide

[0050] First weigh 4g K 2 S 2 o 8 、3g P 2 o 5 Mix with 5g of graphite powder, then add 20ml of concentrated sulfuric acid and stir at 85°C for 4 hours, then cool to room temperature, add 1.2L of distilled water and stir for 14 hours, filter with 0.40μm microporous filter paper to remove some residual acid, The product was dried for 28 hours to obtain pre-oxidized graphite;

[0051] Add pre-oxidized graphite to 240ml concentrated sulfuric acid, stir constantly and add 35g KMnO in ice bath 4 , stirred at 35°C for 3 hours, then added 450ml of distilled water to dilute, continued to stir for 1.5 hours, then added 1.0L of distilled water, continued to stir, and finally added 50ml of 25% H 2 o 2 The solution was continuously stirred until the solution was light yellow, filtered, washed, and dried in a vacuum at 50° C. to obtain graphite oxide;

[0052] Dissolve graphite oxide in 100ml of distilled water and ultrasonically di...

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Abstract

The invention discloses a method for preparing a high-barrier graphene oxide-polyethylene nano composite film. The method comprises the following steps: ultrasonically dispersing modified graphene oxide into xylene and heating; then adding high-density polyethylene and stirring so as to obtain an ODA-GO / HDP mixed solution; cleaning an ultra-high molecular weight polyethylene film by xylene; after xylene is evaporated, soaking a UHMWPE film into a hot ODA-GO / HDPE mixed solution in a dipping manner; drying; and repeating the above steps until the required layer quantity is reached. The high-barrier graphene oxide-polyethylene nano composite film prepared by the method is high in safety and good in environmental protection property; the oxygen permeating coefficient is reduced by about 49%; the nano composite film has ultra-high oxygen barrier property, can meet the packaging requirements of a plurality of foods and drugs and use of other products, is simple in process and low in cost, and has broad practicability and promotional value.

Description

technical field [0001] The invention belongs to the technical field of polymer nanocomposite material preparation, and in particular relates to a method for preparing a high-barrier graphene oxide-polyethylene nanocomposite film. Background technique [0002] In recent years, olefin polymers have been more and more widely used in food and pharmaceutical packaging due to their excellent mechanical properties, outstanding molding processability, good chemical stability and low price. However, gas barrier properties Poor performance has become a key problem restricting its application in packaging. In order to meet market demand, improving its gas barrier performance has become an important research direction. At present, the methods to improve the barrier properties of polymers mainly include vacuum evaporation, multi-layer co-extrusion compounding and layered nano-filler compounding. Among them, the compounding of layered nanofillers has been the focus of attention in recent...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K3/04B32B37/02
CPCC08J7/042C08J2323/06C08J2423/06C08K3/04C08K9/02C08K9/04C08L2201/14C08L2203/16C08L2207/062C08L2207/068C08L23/06
Inventor 任鹏刚张晓亮任联振张媛
Owner 上海追得新材料科技有限公司
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