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High-concentration graphene slurry and its preparation method and device

A preparation device and graphene technology, applied in the field of graphene, can solve the problems of increased preparation process, high energy consumption, increased cost, etc., and achieve the effect of reducing preparation steps, simple preparation process, and improving mechanization

Active Publication Date: 2019-11-12
BEIJING TUNGHSU CARBON ADVANCED MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Evaporation and concentration will increase the preparation process and high energy consumption. At the same time, a large amount of evaporated water needs to be equipped with an evaporated water collection system, which increases the cost

Method used

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  • High-concentration graphene slurry and its preparation method and device

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preparation example Construction

[0040] The invention provides a preparation method of graphene slurry.

[0041] The preparation method of the graphene slurry provided by the present invention comprises weighing expanded graphite, a dispersant and a solvent, and dividing the expanded graphite into N parts, which are respectively the first expanded graphite, ..., the Nth Expanded graphite, the N is greater than or equal to 2, the dispersant is divided into M parts, respectively the first dispersant, ..., the M dispersant, the M is greater than or equal to 2 ; The first expanded graphite, the first dispersant and all solvents are first stirred, and the first mixed solution is obtained after stirring; the first mixed solution is placed in an ultrasonic system, and graphene is obtained after ultrasonic Slurry precursor; Stir remaining expanded graphite and dispersant in batches, and add in batches to described ultrasonic system, after ultrasonic, obtain described graphene slurry, by mass percentage, described Th...

Embodiment 1

[0060] Prepare 10kg of aqueous slurry whose concentration of graphene slurry is 10wt%. The dispersant is polyvinylpyrrolidone, and the mass ratio of polyvinylpyrrolidone and expanded graphite is 0.3. Calculate the expanded graphite required for the slurry to be 1 kg, the dispersant to be 0.3 kg, and the total mass of the solvent to be 8.7 kg.

[0061] The preparation device of the graphene slurry that present embodiment provides is as figure 1 shown. In the device provided in this embodiment, the ultrasonic system includes a flange 11 of the ultrasonic device, a flange 12 of the ultrasonic device, a water outlet 13 of the water wall, an energy-concentrating ultrasonic rod 14, a water wall 15, an ultrasonic system reactor cavity 16, and a water cooling wall. Wall water inlet 17; peristaltic pump 31 includes peristaltic pump head 32. At this time, the first switch 34 , the second switch 35 , the third switch 36 and the fourth switch 37 are all in the off state.

[0062] The ...

Embodiment 2

[0073]Prepare 20kg of NMP phase slurry whose graphene slurry concentration is 5wt%. The dispersant is polyoxypropylene-polyoxyethylene copolymer, and the mass ratio of dispersant to expanded graphite is 0.2. Calculate the expanded graphite required for the slurry to be 1 kg, the dispersant to be 0.2 kg, and the total mass of the solvent to be 18.8 kg.

[0074] Step 1: Stir 0.25kg of expanded graphite, 0.05kg of polyoxypropylene-polyoxyethylene copolymer, and 18.8kg of water in the stirring system 21, and use a peristaltic pump 31 to slowly place the materials in the stirring system in the ultrasonic system. The circulating liquid volume of the pump is 15kg / min, and the ultrasonic reaction system is turned on, so that all the materials in the stirring system enter the reaction kettle cavity 16 of the ultrasonic system;

[0075] Step 2: Open the third switch 36 and the fourth switch 37, close the first switch 34 and the second switch 35, and ultrasonically peel to D50<3um, D90<...

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Abstract

The invention provides a high-concentration graphene slurry, and a preparation method and a preparation device thereof. The high-concentration graphene slurry is prepared through stage addition of expandable graphite and a dispersant and one-shot addition of a solvent without concentration. The preparation method of the slurry further mechanizes the preparation process of the graphene slurry, and facilitates the large-scale production of the high-concentration graphene slurry.

Description

technical field [0001] The invention relates to the field of graphene, in particular to a high-concentration graphene slurry, a preparation method and a preparation device. Background technique [0002] Due to its excellent mechanical, electrical and thermal properties, graphene is attracting more and more research teams to carry out its theoretical and applied research. The price of graphene is relatively high, and the development of green, high-quality, large-scale, and high-concentration preparation processes has become a research hotspot in the field of graphene, and it is also one of the keys to whether graphene can be applied industrially and replace traditional products. [0003] The preparation of graphene by liquid phase exfoliation of expanded graphite is one of the methods to realize green, high-quality and large-scale preparation of graphene. Expanded graphite is a non-polar material with excellent adsorption properties. The oil absorption value is more than 10 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19
Inventor 李青杜雄伟李赫然王忠辉
Owner BEIJING TUNGHSU CARBON ADVANCED MATERIALS TECH CO LTD
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