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Application of star-shaped block polymer as dispersing agent in preparation of graphene dispersion liquid

A graphene dispersion and block polymer technology, applied in carbon compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of difficult preparation of graphene dispersion, low concentration of graphene dispersion, small electrostatic repulsion, etc. Problems, to achieve the effect of simplifying the stripping process, cost green and environmental protection, and low cost

Pending Publication Date: 2022-08-02
合肥艾克思维新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These above-mentioned dispersing agents have certain exfoliation effect, but because the steric hindrance or electrostatic repulsion that it provides when being adsorbed on the graphene sheet is little, thereby exfoliation efficiency is low, it is difficult to prepare high-quality graphene dispersion liquid, the obtained graphene The concentration of the dispersion is low, which reduces the utilization rate of raw materials; in addition, part of the subsequent use needs to be concentrated, which increases the cost of industrial production of graphene

Method used

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  • Application of star-shaped block polymer as dispersing agent in preparation of graphene dispersion liquid
  • Application of star-shaped block polymer as dispersing agent in preparation of graphene dispersion liquid
  • Application of star-shaped block polymer as dispersing agent in preparation of graphene dispersion liquid

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preparation example Construction

[0056] A second aspect of the present invention provides a method for preparing a graphene dispersion, characterized in that it comprises the following steps:

[0057] After mixing graphite, star-shaped block polymer Polyglycerol-g-X-b-Y and deionized water uniformly, the graphene dispersion is obtained by liquid phase exfoliation.

[0058] Wherein, the type and size of the graphite are not particularly limited, and the type of graphite conventionally used to prepare the graphene dispersion in the art can be prepared by the preparation method of the present invention, and can be selected according to the actual situation. In some specific embodiments, the graphite is selected from one of natural flake graphite and artificial graphite, and the size of the graphite is 32-10000 mesh.

[0059] Further scheme, the consumption of star-shaped block polymer can be adjusted according to the consumption of graphite, in some specific embodiments of the present invention, the mass ratio o...

Embodiment 1

[0064] Preparation of star block polymers

[0065] The preparation of star block polymer in this example is as follows figure 1 As shown in, in an ice-water bath, tetraglycerol was dissolved in 30 mL of N-methylpyrrolidone to form a homogeneous solution, to which 2-bromoisobutyryl bromide was added, wherein tetraglycerol and 2-bromoisobutyryl bromide were added. The molar ratio of butyryl bromide is 1:30; after fully mixing the reaction with magnetic stirring, the reaction solution is repeatedly precipitated and purified to obtain the tetraglycerol macromolecular initiator Polyglycerol-Br;

[0066] Polyglycerol-Br, styrene, cupric chloride and 4,4'-dinonyl-2,2'-bipyridine were added in a molar ratio of 1:500:1.0:10:20 to 30 mL of N,N-dimethylformaldehyde. In the Schlenk bottle of methylformamide, after fully stirring, pass nitrogen to exhaust the air, after freezing with liquid nitrogen and vacuum deaeration, cuprous chloride is added, and the reaction is carried out at 60 ...

Embodiment 2

[0079] Preparation of star block polymers

[0080] In an ice-water bath, diglycerol was dissolved in 30 mL of N,N-dimethylformamide to form a homogeneous solution, and 2-bromo-2-methylpropionyl bromide was added to it, wherein diglycerol and 2 -The molar ratio of bromo-2-methylpropionyl bromide is 1:20; after fully mixing the reaction with magnetic stirring, the reaction solution is repeatedly precipitated and purified to obtain the diglycerol macromolecular initiator Polyglycerol-Br;

[0081] Add Polyglycerol-Br, methylstyrene, copper bromide, and tris(2-pyridylmethyl)amine in a molar ratio of 1:300:0.1:0.9:2 to a Schlenk bottle containing 30 mL of anisole, fully After stirring, the air was discharged through nitrogen, and after being frozen in liquid nitrogen and deoxygenated by vacuum, cuprous bromide was added, and the reaction was carried out at 60 ° C to obtain the polymer Polyglycerol-g-polymethylstyrene; when the desired polymer The molecular weight reaches 3.4×10 ...

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Abstract

The invention discloses an application of a star-shaped block polymer as a dispersant in preparation of a graphene dispersion liquid, the star-shaped block polymer is a polymer with polyglycerol as a core and an X-b-Y diblock copolymer as an arm, and the general formula of the star-shaped block polymer is Polyglyceral-g-X-b-Y, wherein the molecular structure of the monomer of the block X has a benzene ring, the benzene ring is connected with a branched chain with a carbon-carbon double bond, and the number of carbon atoms of the branched chain with the carbon-carbon double bond is less than or equal to 4; and the block Y is a water-soluble polymer. By using the star-shaped block polymer as a dispersing agent, the water-soluble graphene dispersion liquid with high stability, high solid content, high yield and no agglomeration can be prepared, and the advantages of high economic benefit and large-scale production are provided for preparation of the graphene dispersion liquid.

Description

technical field [0001] The invention belongs to the technical field of graphene preparation, in particular to the application of a star-shaped block polymer as a dispersant in preparing a graphene dispersion. Background technique [0002] Graphene is composed of a single layer of carbon atoms with sp 2 Due to its perfect two-dimensional structure, the material with a two-dimensional honeycomb lattice structure composed of hybrid close packing occupies several "best properties" - the highest intrinsic strength (~130GPa), the highest carrier migration rate (up to 200000cm 2 / V·s) and the highest room temperature thermal conductivity (~5000W·m -1 ·K -1 , in-plane thermal conductivity), etc. Therefore, graphene has broad application prospects in the fields of flexible energy storage devices, optoelectronics, sensors, semiconductor materials, and drug carriers. [0003] In the prior art, commonly used methods for preparing graphene include mechanical exfoliation method, chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194C08F293/00
CPCC01B32/194C08F293/005C08F2438/01Y02E60/13
Inventor 张建安朱媛媛吴明元吴庆云杨建军刘久逸
Owner 合肥艾克思维新材料科技有限公司
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