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Method for improving dispersing performance of graphene

A technology of dispersion performance and graphene, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of graphene performance impact, dispersion efficiency, dispersion stability, graphene structure damage, graphene easy to agglomerate, etc. Achieve the effects of high dispersion stability, easy industrialization and high dispersion efficiency

Active Publication Date: 2018-08-28
深圳名飞远科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the graphene dispersant of this invention can quickly disperse graphene and does not agglomerate for a long time, it uses a wide variety of dispersants, which will have a certain impact on the performance of graphene
[0006] Therefore, in the prior art, there is still a lack of a method that can uniformly disperse graphene in water with high dispersion efficiency, high dispersion stability, and less damage to the graphene structure, so as to solve the problem that graphene is easy to agglomerate, and can meet the requirements of industrialization. preparation requirements

Method used

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  • Method for improving dispersing performance of graphene

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Effect test

Embodiment 1

[0027] Embodiment 1, a kind of method that improves graphene dispersion property

[0028] The method for described improving graphene dispersibility, comprises the following steps:

[0029] S1 Add graphene to the container, add N,N-dimethylformamide, the amount of N,N-dimethylformamide added is 28 times the mass of graphene, mix well, seal the container, and use ultrasonic cell The pulverizer is ultrasonic, the ultrasonic frequency is 23kHz, the ultrasonic time and the intermittent time are 3s and 2s respectively, in order to make the temperature of the dispersion liquid lower than 30°C, the container is treated in an ice bath to obtain a graphene / DMF mixture, which is filtered to obtain a surface Functionalized graphene;

[0030] S2 disperses the surface-functionalized graphene obtained in step S1 in deionized water through an ultrasonic water bath, the ultrasonic power is 300W, and the ultrasonic time is 15min, so that the content of the surface-functionalized graphene in t...

Embodiment 2

[0033] Embodiment 2, a kind of method that improves graphene dispersion property

[0034] The method for described improving graphene dispersibility, comprises the following steps:

[0035] S1 Add graphene to the container, add N,N-dimethylformamide, the amount of N,N-dimethylformamide added is 32 times the mass of graphene, mix well, seal the container, and use ultrasonic cell The pulverizer is ultrasonic, the ultrasonic frequency is 25kHz, the ultrasonic time and the intermittent time are 3s and 2s respectively, in order to make the temperature of the dispersion liquid lower than 30°C, the container is treated in an ice bath to obtain a graphene / DMF mixture, which is filtered to obtain a surface Functionalized graphene;

[0036] S2 disperses the surface-functionalized graphene obtained in step S1 in deionized water through an ultrasonic water bath, the ultrasonic power is 500W, and the ultrasonic time is 25min, so that the content of surface-functionalized graphene in the s...

Embodiment 3

[0039] Embodiment 3, a kind of method that improves graphene dispersion property

[0040] The method for described improving graphene dispersibility, comprises the following steps:

[0041] S1 Add graphene to the container, add N,N-dimethylformamide, the amount of N,N-dimethylformamide added is 30 times the mass of graphene, mix well, seal the container, and use ultrasonic cell The pulverizer is ultrasonic, the ultrasonic frequency is 24kHz, the ultrasonic time and the intermittent time are 3s and 2s respectively, in order to make the temperature of the dispersion liquid lower than 30°C, the container is treated in an ice bath to obtain a graphene / DMF mixture, which is filtered to obtain a surface Functionalized graphene;

[0042] S2 disperses the surface-functionalized graphene obtained in step S1 in deionized water through an ultrasonic water bath. agent and vitamin C, the above surfactant is composed of dimethyl diallyl ammonium chloride-styrene-acrylamide copolymer and s...

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Abstract

The invention belongs to the technical field of graphene materials, and specifically relates to a method for improving the dispersing performance of graphene. The method for improving the dispersing performance of graphene, provided by the invention, comprises the following steps: filtering a graphene / DMF mixture obtained through ultrasonic treatment of a N,N-dimethyl formamide solvent so as to obtain surface-functionalized graphene, dispersing the surface-functionalized graphene into deionized water through ultrasonic water bath, adding a surface active gent and vitamin C to obtain a mixed liquor, uniformly mixing the mixed liquor, carrying out centrifugalization, collecting upper liquid to obtain a dispersion liquid, putting the dispersion liquid into a three-mouth flask provided with aconstant flow pump, increasing the temperature to be 90 to 100 DEG C, adding hydrazine hydrate and vitamin C, carrying out a reaction for 1.5 to 3 h under constant speed magnetic stirring, and coolingto room temperature. According to the method for improving the dispersing performance of graphene, provided by the invention, the graphene can be uniformly dispersed in water, the method is high in dispersion efficiency and high in dispersion stability, and the requirement of industrial preparation can be met.

Description

technical field [0001] The invention belongs to the technical field of graphene materials, in particular to a method for improving the dispersion performance of graphene. Background technique [0002] Perfect graphene is made of carbon atoms via sp 2 The stable two-dimensional planar structure formed by hybridization bonds, such an inert surface structure brings difficulties to the stable existence of single-sheet graphene and its dispersion in other solvents, thus limiting the development of graphene and graphene-based composites. Research development and application. In order to realize the widespread application of graphene, the first problem to be solved is the dispersion stability of graphene. For how to improve the dispersion of graphene, a large number of researchers have done a series of research in this area, the methods mainly focus on the surface modification of graphene, the introduction of foreign molecules such as loading nanoparticles, adding surfactant mole...

Claims

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Application Information

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IPC IPC(8): C01B32/194
Inventor 曾深王飞蓉王伯杰许名飞曾立平
Owner 深圳名飞远科技有限公司
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