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Graded dispersion method and device for preparing graphene-based waterborne dispersion liquid

A technology of dispersion liquid and alkene water, applied in chemical instruments and methods, inorganic pigment treatment, dyeing physical treatment, etc., can solve the problems of poor dispersion liquid stability, low dispersion liquid concentration, unfavorable side reactions or side effects, etc., to promote development , excellent stability, solve the effect of difficult dispersion

Active Publication Date: 2016-10-12
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above methods all use a single or simple graded pure mechanical dispersion process, which has disadvantages such as the need to add dispersing aids, poor stability of the dispersion, and low concentration of the dispersion.
The introduction of foreign non-graphene impurities in the dispersion system not only hinders the development of graphene nano-characteristics, but also causes unfavorable side reactions or side effects in applications, which adversely affects the application characteristics of graphene powders and restricts the development of graphene. industrial development

Method used

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  • Graded dispersion method and device for preparing graphene-based waterborne dispersion liquid
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  • Graded dispersion method and device for preparing graphene-based waterborne dispersion liquid

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Embodiment 1

[0040] A stabilizing electric field device, which includes an insulating annular wall 2, an annular electrode 3 (connected to a DC negative pole), a central electrode 4 (connected to a DC positive pole), an insulating base plate 5, an insulating annular wall 2 connected to an insulating base plate 5, and the center of the insulating base plate 5 The center electrode 4 is vertically connected at the center, the outer wire 1 of the center electrode 4 is installed in the insulating bottom plate 5, and the ring electrode 3 is installed in the insulating ring wall 2.

[0041] (1) According to the ratio of graphene powder: water mass ratio of 1:9, weigh 5g of graphene powder and 45g of deionized water respectively, add them to the beaker, and use the DLH overhead stirrer from Verp, Italy to carry out the stirring at a constant speed. Stir, and adjust the speed of the stirrer to 100rpm, stir for 30min, so that the water is fully wetted on the graphene surface to obtain a pre-wetting s...

Embodiment 2

[0048] (1) According to the ratio of graphene powder:solvent mass ratio of 1:80, weigh 5g of graphene powder and 400g of deionized water respectively, add them to the beaker, and use the DLH overhead stirrer from Italy Werp to carry out constant speed Stir, and adjust the speed of the stirrer to 10rpm, stir for 25min, so that the water is fully wetted on the graphene surface, and obtain a pre-wetting liquid;

[0049] (2) Transfer the graphene pre-wetting solution gained in step (1) to the T18 high-speed disperser of Germany IKA for primary dispersion, adjust the dispersing machine dispersion disk speed to be 1000rpm, and the working time is 60min to obtain the primary dispersion;

[0050] (3) Transfer the primary dispersion obtained in step (2) to a vacuum ultrasonic cup, and use a vacuum degassing ultrasonic cleaning machine from Wuxi Taiming Ultrasonic Environmental Technology Co., Ltd., set the vacuum to -0.1MPa, and the ultrasonic power to 2000W. The working time is 15 min...

Embodiment 3

[0055] (1) According to the ratio of graphene powder: solvent mass ratio of 1:99, weigh 10g of graphene powder and 990g of deionized water respectively, add them into a beaker, and use WIGGENS WB3000-D of Beijing Sangyi Experimental Instrument Research Institute Stir at a constant speed with a high-speed large-torque stirrer, adjust the stirrer speed to 500rpm, and stir for 10 minutes to fully wet the graphene surface with water to obtain a pre-wetting solution;

[0056] (2) Transfer the graphene pre-wetting solution obtained in step (1) to a German Wiggens D500 high-shear dispersing emulsifier for primary dispersion, adjust the dispersing emulsifying machine dispersion disk speed to 10000rpm, and work for 30min to obtain the primary dispersion ;

[0057] (3) Transfer the primary dispersion obtained in step (2) to a constant temperature sealed ultrasonic reactor still produced by Shanghai Bilang Instrument Manufacturing Co., Ltd., and set the vacuum to be -0.06MPa, the ultraso...

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Abstract

The invention discloses a graded dispersion method for preparing a graphene-based waterborne dispersion liquid. The method comprises steps as follows: pre-soaking of a graphene material, primary dispersion, vacuum and ultrasonic secondary dispersion and electric field stabilization treatment in a stabilized electric filed device in the method, and the graphene-based waterborne dispersion liquid is obtained. The graphene-based waterborne dispersion liquid prepared with the method has the solid content being 0.1 wt%-10wt% and has the advantages that a dispersion aid is not required to be added, the procedure is continuous and prepared slurry can be stored for six months or longer in a normal-temperature and normal-pressure environment without remarkable settlement. The graphene-based waterborne dispersion liquid has the advantages that external non-graphene impurities are not required to be introduced, a use range of the dispersion liquid is wide, the dispersion degree is high, the process is simple, environmental protection is realized and the stability is good.

Description

technical field [0001] The invention belongs to the technical field of graphene material dispersion, and in particular relates to a method and a device for preparing graphene aqueous dispersion liquid by a hierarchical dispersion method. Background technique [0002] Graphene is a carbon atom through sp 2 A new material with a two-dimensional monolithic layered structure formed by hybridization and mutual bonding. Its basic structural unit is a stable six-membered benzene ring. Material. Graphene is the basic structural unit that constitutes other graphitic materials. It can be warped to form zero-dimensional fullerenes, curled to form one-dimensional carbon nanotubes, and stacked to form three-dimensional graphite or diamond. This special structure endows it with unique and magical physical and chemical properties, such as graphene materials with up to ≥2630m 2 / g ultra-high theoretical specific surface area; its electron mobility exceeds 15000cm at room temperature 2 / ...

Claims

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Application Information

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IPC IPC(8): C09C1/46C09C3/04C09C3/06
CPCC09C1/46C09C3/006C09C3/04C09C3/06
Inventor 陈成猛李晓明孔庆强谢莉婧苏方远何敬奎
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI