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A kind of multistage dispersion method of graphene

A graphene dispersion, graphene technology, applied in graphene, chemical instruments and methods, nano-carbon and other directions, can solve the problems of graphene industrial application difficulties, easy agglomeration and stratification, short storage period, etc., to achieve large industrial Improve application value, prevent agglomeration, and have a long storage period

Active Publication Date: 2022-07-12
四川恒力盛泰石墨烯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the existing problems in the prior art are: graphene is difficult to disperse in aqueous dispersion medium, easy to agglomerate and delaminate, and has a short storage period, which has brought huge benefits to the industrial application of graphene difficulty

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of multilevel dispersion method of graphene, concrete preparation steps are:

[0039] (1) Primary dispersion: Mix 95 parts of dipropylene glycol methyl ether (DPM) organic solvent, 2 parts of alkyl sulfate, and 1 part of sodium polycarboxylate evenly, and stir evenly under the action of a high-speed mixer at a stirring speed of 400 rpm. Then adopt the method of gas-phase feeding, pass 2 parts of graphene, the thickness of graphene is 3-5nm, pass into the above-mentioned organic solvent that mixes uniformly, stir and disperse for 30min, make graphene evenly disperse, namely obtain the first grade graphene dispersion liquid.

[0040] (2) Secondary dispersion: Slowly add the primary graphene dispersion into the polyurethane dispersion with a solid content of 37% and stir evenly. The ratio of the primary graphene dispersion to the polyurethane dispersion is 7:3, and ultrasonically Disperse for 120 min and the ultrasonic power is 1000W to obtain the secondary graphen...

Embodiment 2

[0043] A kind of multilevel dispersion method of graphene, concrete preparation steps are:

[0044] (1) Primary dispersion: Mix 90 parts of dipropylene glycol methyl ether (DPM) organic solvent, 3 parts of polyoxyethylene alkyl phenol ether, and 2 parts of sulfonate evenly, and stir them evenly under the action of a high-speed mixer. to 600 rpm. Then adopt the method of gas-phase feeding, pass 5 parts of graphene, the thickness of graphene is 1-3nm, pass into the above-mentioned organic solvent that mixes uniformly, stir and disperse for 30min, make graphene evenly disperse, namely obtain the first grade graphene dispersion liquid.

[0045] (2) Secondary dispersion: Slowly add the primary graphene dispersion into the polyurethane dispersion with a solid content of 43% and stir evenly. The ratio of the primary graphene dispersion to the polyurethane dispersion is 8:1, and ultrasonically Disperse for 60 min and the ultrasonic power is 1500W to obtain the secondary graphene disp...

Embodiment 3

[0048] A kind of multilevel dispersion method of graphene, concrete preparation steps are:

[0049] (1) Primary dispersion: Mix 80 parts of tripropylene glycol n-butyl ether, 0.1 part of polyoxyethylene polyoxypropylene block copolymer, and 5 parts of alkyl quaternary ammonium salt, and stir them evenly under the action of a high-speed mixer. The speed is 300 rpm. Then adopt the method of gas phase feeding, put 0.1 part of graphene, the thickness of graphene is 10nm, into the above-mentioned uniformly mixed organic solvent, stirring and dispersing for 120min, so that the graphene is uniformly dispersed, that is, a first-grade graphene dispersion liquid is obtained.

[0050] (2) Secondary dispersion: Slowly add the primary graphene dispersion into the polyurethane dispersion with a solid content of 37% and stir evenly. The ratio of the primary graphene dispersion to the polyurethane dispersion is 1:1, and ultrasonically Disperse for 30 min and the ultrasonic power is 3000W to ...

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Abstract

The invention discloses a multi-level dispersion method of graphene, comprising the following steps: firstly dispersing graphene in an organic solvent by a primary dispersion process to obtain a primary graphene dispersion; then by a secondary dispersion process The graphene dispersion is uniformly mixed with a certain proportion of polyurethane dispersion to obtain a secondary graphene dispersion. Finally, deionized water, thickener, ammonia water, surfactant and secondary dispersion are uniformly dispersed and mixed by a tertiary dispersion process. The graphene aqueous dispersion that is stable for long-term storage, no nodules and no sedimentation can be obtained. The graphene multi-level dispersion method of the present invention can effectively disperse the graphene, prevent the graphene from agglomerating, has a long storage period, a simple dispersion process, and has great industrial application value.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a multi-level dispersion method of graphene. Background technique [0002] Since the discovery of graphene, due to its excellent electrical conductivity, thermal conductivity and mechanical strength, it has been widely studied in many fields such as functional coatings, polymer composite materials, transparent electrodes, lithium-ion batteries, supercapacitors, and semiconductors. . However, due to the large specific surface area of ​​graphene, the surface activation energy of graphene is large, and it is easy to agglomerate on the microscopic level, which is difficult to disperse, which greatly limits the further application of graphene. Therefore, how to uniformly disperse graphene in liquid or solid to form a film base or connect a network structure to utilize graphene's excellent electrical conductivity, thermal conductivity, barrier, mechanical strengt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/194
CPCC01B32/194C01B2204/28Y02E60/13
Inventor 李昆洲蔡弦
Owner 四川恒力盛泰石墨烯科技有限公司
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