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A kind of preparation method of modified graphene oxide composite polypropylene packaging film

A graphene composite and packaging film technology, applied in the field of packaging materials, can solve the problems of difficulty in graphene oxide, poor gas barrier properties, and difficulty in uniform dispersion of graphene oxide, so as to improve mechanical properties and heat resistance, and improve the interface. Compatibility, gas barrier performance improvement effect

Active Publication Date: 2021-04-13
浙江弥格科技有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention is: when traditional olefinic polymers are directly used as packaging materials, the gas barrier performance is not good, and the gas barrier performance can be improved after graphene oxide is added, but due to the large amount of The existence of oxygen-containing functional groups makes it difficult for graphene oxide to be uniformly dispersed in non-polar olefinic polymer matrix, because graphene oxide is difficult to effectively and uniformly disperse, resulting in the disadvantage that the gas barrier performance of the product after its addition cannot be further improved. Provided is a preparation method of modified graphene oxide composite polypropylene packaging film

Method used

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  • A kind of preparation method of modified graphene oxide composite polypropylene packaging film

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example 1

[0020]Mix graphene oxide and water into a beaker at a mass ratio of 1:20, stir and mix with a stirrer at a speed of 500r / min for 60 minutes, and then add a nonionic surfactant of 0.4 times the mass of graphene oxide to the beaker, Then, at a temperature of 56°C and an ultrasonic frequency of 60 kHz, constant temperature ultrasonic treatment was performed for 2 hours to obtain a graphene oxide dispersion; vinylbenzyl octadecyl dimethyl ammonium chloride and graphite oxide were mixed in a mass ratio of 1:12 The olefin dispersion was mixed and poured into a hydrothermal reaction kettle. Under the conditions of temperature of 160°C, pressure of 1.2MPa, and rotation speed of 600r / min, after hydrothermal stirring and reaction for 5 hours, the hydrothermal reaction kettle was opened, and the pressure was released to normal pressure. Suction filter the material in the hydrothermal reaction kettle to obtain a filter cake, and wash the filter cake with deionized water for 5 times, then t...

example 2

[0022] In parts by weight, successively take 20 parts of styrene, 60 parts of graphene oxide, 5 parts of initiator, 3 parts of emulsifier, 5 parts of electrolyte, and 300 parts of water, first add graphene oxide and emulsifier into water, and stir Stir and mix at a speed of 600r / min for 60min to obtain a water emulsion, then transfer the water emulsion into the reactor, and feed an inert gas into the reactor at a rate of 600mL / min, and under the protection of the inert gas, add Styrene, under the condition of ultrasonic frequency of 60kHz, after ultrasonic dispersion for 60min, then add the initiator, continue under the state of inert gas protection, at the temperature of 85°C, the stirring speed of 800r / min, after constant temperature stirring reaction for 8h, Add an electrolyte to demulsify, and then filter to obtain a filter residue, wash the filter residue 6 times with deionized water, and then vacuum freeze-dry the washed filter residue to obtain modified graphene oxide; i...

example 3

[0024] In parts by weight, take 30 parts of graphene oxide, 80 parts of polypropylene, and 400 parts of xylene in sequence, first pour graphene oxide and xylene into a mixer, and ultrasonically disperse them for 2 hours at a frequency of 60 kHz, then add poly Propylene, at a temperature of 145°C and a rotational speed of 800r / min, heat and stir to dissolve for 2 hours, slowly add the material in the mixer to absolute ethanol at a rate of 10g / min, and wait until the material in the mixer is added dropwise After completion, filter to obtain a precipitate, and then freeze-dry the obtained precipitate in a vacuum, and then heat-press to form a film at a temperature of 200° C. and a pressure of 15 MPa to obtain a modified graphene oxide composite polypropylene packaging film. The nonionic surfactant is octylphenol polyoxyethylene ether. The initiator is ammonium persulfate. The emulsifier is emulsifier OP-10. The electrolyte is magnesium sulfate. The inert gas is nitrogen. The ...

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Abstract

The invention discloses a preparation method of a modified graphene oxide composite polypropylene packaging film, which belongs to the technical field of packaging materials. In the present invention, graphene oxide, non-ionic surfactant and water are ultrasonically treated to obtain a graphene oxide dispersion, which is then mixed with vinyl benzyl octadecyl dimethyl ammonium chloride, and reacted with hydrothermal stirring , suction filtration, washing, ball milling, and sieving to obtain pretreated graphene oxide; then react pretreated graphene oxide with emulsifier, styrene, initiator and other substances under the protection of inert gas to obtain modified graphite oxide After that, the modified graphene oxide, polypropylene and xylene were mixed, then added dropwise to absolute ethanol, and then filtered, dried, and hot-pressed to form a film to obtain the modified graphene oxide composite polypropylene packaging film. The modified graphene oxide composite polypropylene packaging film obtained in the invention has excellent gas barrier performance.

Description

technical field [0001] The invention discloses a preparation method of a modified graphene oxide composite polypropylene packaging film, which belongs to the technical field of packaging materials. Background technique [0002] Olefin polymers are widely used in food and pharmaceutical packaging because of their excellent mechanical properties, processability and low cost. However, the poor gas barrier property has become a key problem restricting its application in the packaging field, and improving its gas barrier property has become an important research direction. Lamellar nanofiller filling is an effective method to improve the gas barrier properties of polymers. Graphene oxide (GO), as a lamellar carbon nanofiller, has a small sheet thickness and a large aspect ratio. Therefore, a very small amount of GO filling can effectively improve the gas barrier properties of polymers. [0003] Huang Huadong et al. found that only 0.72% (volume fraction) of GO reduced the oxyge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08K9/04C08K7/00C08K3/04C08J5/18
CPCC08J5/18C08J2323/12C08K7/00C08K9/04C08K3/042
Inventor 徐冬马俊杰朱东东
Owner 浙江弥格科技有限公司
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