A kind of preparation method of graphene dispersion liquid

A graphene dispersion, graphene technology, applied in chemical instruments and methods, dissolution, mixer and other directions, can solve problems such as inability to meet experiments and industrial production, low dispersion stability, low efficiency, etc., to save dispersion time, The effect of high dispersion stability and simple operation

Active Publication Date: 2017-01-18
SHANDONG YUHUANG NEW ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The physical dispersion method can break up large graphene aggregates, but due to the "nano effect" of graphene and the force of extrusion in the physical dispersion method, the dispersed small-sized graphene will also be densely bonded Together; the chemical dispersion method can make the flocculent graphene on the surface of the aggregate disconnect and disperse from the aggregate, and the effect on the tightly entangled nanomaterials is almost zero
[0005] In addition, the use of a single method for dispersion has low efficiency and low dispersion stability, which cannot meet the requirements of experiments and industrial production.

Method used

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  • A kind of preparation method of graphene dispersion liquid
  • A kind of preparation method of graphene dispersion liquid
  • A kind of preparation method of graphene dispersion liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Get 10g single-layer graphene and 20g polyvinylpyrrolidone, add in 1L N-methylpyrrolidone, fully stir to obtain single-layer graphene mixed solution.

[0026] Turn on the cooling circulating water, set the cooling temperature to 7°C; put the single-layer graphene mixture into the storage tank 3, adjust the speed of the electric agitator 2 to 2000 rpm, and adjust the speed of the colloidal grinding disc 5 and the high-shear dispersing head 6 At 14000 rpm, a focused ultrasonic probe 1 (80 kHz) was added to disperse for 2 h to obtain a single-layer graphene dispersion.

Embodiment 2

[0028] Take 5 g of few-layer graphene and 10 g of polyvinyl alcohol, add them into 1L of distilled water, and stir thoroughly to obtain a few-layer graphene mixture.

[0029] Turn on the cooling circulating water, set the cooling temperature to 5°C; put the few-layer graphene mixture into the storage tank 3, adjust the speed of the electric agitator 2 to 100 rpm, and adjust the speed of the colloidal grinding disc 5 and the high-shear dispersing head 6 At 7000 rpm, add two focused ultrasonic probes 1 (20 kHz, 80 kHz) and disperse for 0.5 h to obtain a few-layer graphene dispersion.

Embodiment 3

[0031] Take 0.2 g of multilayer graphene and 2 g of lauryl polyethylene glycol ether, add them to 2L of absolute ethanol, and stir thoroughly to obtain a multilayer graphene mixed solution.

[0032] Turn on the cooling circulating water, set the cooling temperature to 10°C; put the multi-layer graphene mixture into the storage tank 3, adjust the speed of the electric stirrer 2 to 1000 rpm, and adjust the speed of the colloidal grinding disc 5 and the high-shear dispersing head 6 At 100 rpm, a focused ultrasonic probe 1 (60 kHz) was added for 12 h to disperse to obtain a multilayer graphene dispersion.

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Abstract

The invention discloses a method for preparing a graphene dispersion liquid, which comprises the following steps: (1) adding graphene and a dispersant to a solvent and mixing them uniformly; (2) using a dispersion device to disperse the uniformly mixed liquid, adjusting The rotation speed of the high-shear dispersing head and the colloidal grinding disc is 100-14000 rpm, the rotation speed of the electric agitator is 10-2000 rpm, add a concentrated ultrasonic probe, the ultrasonic frequency is within 20-80 kHz, and adjust the dispersion temperature through the cooling system 0-20°C, after a dispersion time of 0.5-24 h, a graphene dispersion is obtained. The present invention adopts the combination of multiple dispersion methods, synergistic effect, saving dispersion time, improving production efficiency, low cost, simple operation, non-toxic and pollution-free, high dispersion stability, favorable for mass production, and broad prospects for large-scale industrial application.

Description

technical field [0001] The invention belongs to the technical field of graphene materials, in particular to a method for preparing a graphene dispersion. Background technique [0002] Graphene is a carbon atom with sp 2 The hybrid orbitals form a hexagonal two-dimensional material with a thickness of only one carbon atom in a honeycomb lattice arrangement. The thermal conductivity of graphene is as high as 5300W / m . K, higher than carbon nanotubes and diamonds, and its electron mobility exceeds 15000cm at room temperature 2 / (V . s), higher than carbon nanotubes or silicon crystals, and the resistivity is only about 10 -6 Ω . cm, lower than copper or silver, is the material with the lowest resistivity. Graphene has such excellent physical and chemical properties that it has been gradually used in transparent conductive films, nanoelectronic devices, conductive inks, solar cells, lithium batteries, supercapacitors, sensors, and biomedicine. [0003] The dispersion meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01F13/10B01F15/06C01B31/04
Inventor 王卓陈欣董贺存易江平赵成龙王瑛李华锋李廷锋
Owner SHANDONG YUHUANG NEW ENERGY TECH
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