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A kind of graphene film and continuous preparation method thereof

A graphene film and graphene technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of graphene being difficult to form a large-area continuous film, and overcome the difficulty of large-area continuous film formation. Low equipment requirements and the effect of shortening the production process

Active Publication Date: 2019-05-03
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a graphene thin film material and its continuous preparation method; the method overcomes the problem that graphene is not easy to form a large-area continuous film, and adopts the rolling method of continuous preparation to prepare a large area of ​​graphene film material

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  • A kind of graphene film and continuous preparation method thereof
  • A kind of graphene film and continuous preparation method thereof
  • A kind of graphene film and continuous preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Preparation of polytetrafluoroethylene dispersion:

[0032] Add 1.4706g of polytetrafluoroethylene concentrated dispersion (60wt%) and 50mL of ethanol into a beaker, and stir continuously at room temperature until the dispersion is uniform to obtain dispersion A, that is, polytetrafluoroethylene dispersion (2.2wt%).

[0033] 2. Preparation of graphene dispersion:

[0034] Add 5g of graphene to the beaker, add ethanol continuously, and add ethanol under stirring until the graphene powder can be completely immersed in ethanol. After magnetic stirring at room temperature and ultrasonic dispersion, the power was 80W, and the ultrasonic time was 1 hour to obtain dispersion B, namely graphene dispersion (concentration: 3.5wt%).

[0035] 3. Roller slurry preparation:

[0036] Add the dispersion A to the dispersion B, stir at room temperature, put it on the heating table after being uniform, heat to 70°C and keep stirring to volatilize the ethanol until the slurry reaches ...

Embodiment 2

[0045] 1. Preparation of polytetrafluoroethylene dispersion:

[0046]Add 1.4706g of polytetrafluoroethylene concentrated dispersion (60wt%) and 50mL of ethanol into a beaker, and stir continuously at room temperature until the dispersion is uniform to obtain dispersion A, that is, polytetrafluoroethylene dispersion (2.2wt%).

[0047] 2. Preparation of graphene dispersion:

[0048] Add 3g of graphene to the beaker, add ethanol continuously, and add ethanol under stirring until the graphene powder can be completely immersed in ethanol. At room temperature, after magnetic stirring and ultrasonic dispersion, the power is 50W, and the ultrasonic time is 1 hour to obtain dispersion B, namely graphene dispersion (concentration: 3.5wt%).

[0049] 3. Roller slurry preparation:

[0050] Add the dispersion A to the dispersion B, stir at room temperature, put it on the heating table after being uniform, heat to 70°C and keep stirring to volatilize the ethanol until the slurry reaches a ...

Embodiment 3

[0058] 1. The preparation of polytetrafluoroethylene dispersion is the same as in Example 1.

[0059] 2. Preparation of graphene dispersion:

[0060] Add 5g of graphene into the beaker, then add deionized water, and keep stirring until the graphene sheets are completely immersed in deionized water. After ultrasonic dispersion by the probe, the power is 80W, and the ultrasonic time is 1h, to obtain a dispersion of graphene in water (concentration: 2wt%).

[0061] 3. Preparation of roll-pressed slurry:

[0062] Mix the polytetrafluoroethylene dispersion and the graphene dispersion, stir continuously until they are uniform, put them on the heating table, heat to 70°C and stir continuously to volatilize the deionized water until the slurry reaches a semi-solid state and meets the requirements of the roller. Until the pressure condition; the solid content of the finally obtained slurry is 60wt%.

[0063] 4. Preparation of graphene film:

[0064] Take the graphene-polytetrafluor...

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Abstract

The present invention relates to a graphene film and a continuous preparation method thereof. The graphene film comprises, by mass part, 60-95 parts of grapheme and 5-40 parts of polytetrafluoroethylene. The continuous preparation method comprises the steps of dispersing a polytetrafluoroethylene concentrated dispersion liquid in the ethyl alcohol, stirring to obtain 0.2wt%-5.0wt% of polytetrafluoroethylene dispersion liquid; dispersing the grapheme in the deionized water or the ethyl alcohol, carrying out the ultrasonic dispersion to obtain the 0.1wt%-3.0wt% grapheme dispersion liquid; mixing the polytetrafluoroethylene dispersion liquid and the grapheme dispersion liquid, heating and stirring to obtain the slurry of a semi-solid state, placing the slurry on a double-roll machine, rolling to obtain the complete film, shrinking a rolling spacing, and rolling, thereby obtaining the graphene film. The graphene film of the present invention has the good mechanical property and electrochemical property, and can be applied in the fields, such as the capacitive deionization field, the super capacitor field, etc. According to the present invention, the large-area and continuous preparation can be realized, and the industrial application is conducive.

Description

technical field [0001] The invention belongs to the field of film preparation, in particular to a graphene-based film material and a continuous preparation method thereof. The invention can realize large-area and continuous preparation, and is beneficial to industrial application. The graphene film of the invention has good mechanical properties and electrochemical properties, and has great application potential in the fields of capacitive deionization, supercapacitors and the like. Background technique [0002] With the continuous depletion of fresh water resources, in order to alleviate the water resource crisis, seawater desalination technology continues to develop, among which capacitive deionization technology with high energy efficiency and good regeneration performance has become a hot research direction. Graphene materials have great application potential in the field of capacitive deionization due to their high specific surface area, good capacitive performance, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/32H01G11/86C01B32/194
CPCY02E60/13
Inventor 王宏志王鹿郭洋李耀刚张青红
Owner DONGHUA UNIV
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