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Low-viscosity graphene oxide slurry and preparation method thereof, and graphene oxide film and preparation method thereof

A graphene film and graphene technology, applied in the direction of graphene, chemical instruments and methods, graphite, etc., can solve the problems of reducing the viscosity of graphene oxide slurry, reducing the diameter of graphene oxide sheets, etc., so as to reduce the preparation cost, The effect of improving efficiency

Active Publication Date: 2021-02-26
CHANGZHOU FUXI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] For one or more of the existing problems in the prior art, the technical problem to be solved in the present invention is to improve the efficiency of graphene oxide slurry coating, the main method is to pass graphene oxide through high-pressure shear, high-speed impact and strong Ultra-micronization by the action of holes, reducing the sheet diameter of graphene oxide, reducing the viscosity of graphene oxide slurry, increasing the solid content of graphene oxide slurry, thereby improving the coating efficiency of graphene oxide slurry

Method used

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  • Low-viscosity graphene oxide slurry and preparation method thereof, and graphene oxide film and preparation method thereof
  • Low-viscosity graphene oxide slurry and preparation method thereof, and graphene oxide film and preparation method thereof
  • Low-viscosity graphene oxide slurry and preparation method thereof, and graphene oxide film and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0083] Step 1): Disperse the graphene oxide filter cake with a solid content of 5.0% in deionized water using a dispersing device, the linear velocity of the dispersion is 5m / s, and the viscosity of the graphene oxide slurry obtained after dispersing for 2h is 100000mPa·s;

[0084] Step 2): The graphene oxide slurry is ultra-micronized, the pressure is 50MPa, and the obtained low-viscosity graphene oxide slurry has a viscosity of 20000mPa·s;

[0085] Step 3): Use a defoaming device to vacuum defoam the low-viscosity graphene oxide slurry in step 2), and the vacuum value is -80kPa;

[0086] Step 4): Apply the defoamed slurry in step 3) onto the PET film by scraper coating, and dry at 80°C for 75 minutes to obtain the graphene oxide film, which is directly peeled and rolled, and the thickness of the coating is 2.5mm , the coating speed is 1.2m / min;

[0087] Step 5): Slitting the graphene oxide film coiled material obtained in step 4) winding, such as Figure 6 As shown, a grap...

Embodiment 2

[0091] Step 1): Disperse the graphene oxide filter cake with a solid content of 10.0% in deionized water using a dispersing device, the linear speed of dispersion is 5m / s, and the viscosity of the graphene oxide slurry obtained after dispersing for 2h is 200000mPa·s;

[0092] Step 2): The graphene oxide slurry is ultra-micronized, the pressure is 100MPa, and the obtained low-viscosity graphene oxide slurry has a viscosity of 20000mPa·s;

[0093] Step 3): Use a defoaming device to vacuum defoam the low-viscosity graphene oxide slurry in step 2), and the vacuum value is -80kPa;

[0094]Step 4): Apply the defoamed slurry in step 3) onto the PET film by doctor blade coating, and dry at 120°C for 11 minutes to obtain the graphene oxide film, which is directly peeled and rolled, and the thickness of the coating is 0.75mm , the coating speed is 8.0m / min;

[0095] Step 5): Slitting the graphene oxide film coiled material obtained in step 4) winding, such as Figure 8 As shown, a gra...

Embodiment 3

[0099] Step 1): Disperse the graphene oxide filter cake with a solid content of 8.0% in deionized water using a dispersing device, the linear speed of dispersion is 5m / s, and the viscosity of the graphene oxide slurry obtained after dispersing for 2h is 150000mPa·s;

[0100] Step 2): The graphene oxide slurry is ultra-micronized, the pressure is 100MPa, and the obtained low-viscosity graphene oxide slurry has a viscosity of 20000mPa·s;

[0101] Step 3): Use a defoaming device to vacuum defoam the low-viscosity graphene oxide slurry in step 2), and the vacuum value is -80kPa;

[0102] Step 4): Apply the defoamed slurry in step 3) onto the PET film by using a doctor blade, and dry at 100°C for 30 minutes to obtain a graphene oxide film that is directly peeled and rolled, and the thickness of the coating is 1.5mm , the coating speed is 3m / min;

[0103] Step 5): Slitting the graphene oxide film coiled material obtained in step 4) winding, such as Figure 9 As shown, a graphene o...

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Abstract

The invention provides low-viscosity graphene oxide slurry and a preparation method thereof, a graphene oxide film and a preparation method thereof, and a graphene heat conduction film and a preparation method thereof. According to the method mainly adopted by the invention, the graphene oxide is subjected to superfine grinding under the actions of high-pressure shearing, high-speed impact and strong holes, and the sheet diameter of the graphene oxide is reduced, so that the viscosity of the graphene oxide slurry is reduced, the solid content of the graphene oxide slurry is improved, and the efficiency of coating the graphene oxide slurry into a graphene oxide film is improved.

Description

technical field [0001] The invention relates to the field of graphene materials, in particular to a process for improving the preparation efficiency of a graphene heat-conducting film prepared by a thermal reduction method. Background technique [0002] Since its discovery in 2004, graphene has been extensively studied in sensing devices, optoelectronics, and energy materials due to its large specific surface area, high electrical conductivity, excellent chemical and thermodynamic stability, and physical and mechanical properties. and apply. [0003] In the prior art, the main method for preparing a graphene heat-conducting film with good thermal conductivity is: first disperse the graphene oxide filter cake prepared by the Hummers method into a slurry, coat the slurry on the substrate, and prepare it after drying. Graphene oxide film, and then perform high-temperature thermal reduction on the graphene oxide film to obtain a graphene heat-conducting film. [0004] However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/23
CPCC01B32/23C01B2204/26C01B2204/20C01P2004/20C01P2004/61C01B32/198C01P2006/10C01P2006/32C01B32/184
Inventor 卢静周步存周仁杰李峰
Owner CHANGZHOU FUXI TECH CO LTD
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