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Star cationic graphene dispersant and its application

A graphene dispersant and cation technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve difficult problems such as dispersant interaction, achieve obvious steric hindrance, good stability, strong The effect of entropy protection

Active Publication Date: 2021-10-01
中润超油(北京)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, no effective dispersant has been found for the dispersion of graphene, because the surface active groups of graphene are removed during the reduction process and become an inert material, which is difficult to interact with the dispersant

Method used

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  • Star cationic graphene dispersant and its application
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  • Star cationic graphene dispersant and its application

Examples

Experimental program
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preparation example Construction

[0038] The preparation method of the star-shaped cationic graphene dispersant disclosed by the invention, the concrete steps are as follows:

[0039] Step 1, synthesizing star initiators, such as trimethylolpropane tri(α-bromoisobutyrate), dipentaerythritol hexa(α-bromoisobutyrate);

[0040] Step 2, using a star initiator to initiate the polymerization of an acrylate monomer to obtain a star polymer;

[0041] Step 3: Dissolve the star-shaped polymer synthesized above in a solvent, then add N-methylimidazole at 100-120°C for reaction, react for 48-96 hours, react under nitrogen or argon atmosphere, and the reaction ends Finally, the solvent was removed to obtain a light yellow solid, which was the star-shaped cationic graphene dispersant.

[0042] Weigh the above-mentioned star-shaped cationic graphene dispersant and dissolve it in a solvent, add a certain mass of graphene, stir evenly, place the solid-liquid mixture in a sand mill for high-speed dispersion, and finally obtain...

Embodiment 1

[0045] 1. Synthesis of Star Trifunctional Initiator Trimethylolpropane Tris(α-Bromoisobutyrate)

[0046] 6.5 g of trimethylolpropane, 30 g of triethylamine and 200 mL of tetrahydrofuran were sequentially added into a 1000 ml reaction flask, and placed under an ice-water bath with sealed mechanical stirring. Slowly drip 65g of α-bromoisobutyryl bromide into the flask, and after 15 minutes of dropping, react in the dark for 48 h. After the reaction, use filter paper to remove the salt, wash the filtrate with 5% sodium hydroxide solution to remove excess α-bromoisobutyryl bromide, then use dichloroethane as the extractant to extract, and then distill under reduced pressure to remove tetrahydrofuran and dichloroethane. alkane, then recrystallize with absolute ethanol, and dry to obtain the product of white powder, which is trifunctional initiator trimethylolpropane three (alpha-bromoisobutyrate), and its structure is as follows:

[0047]

[0048] 2. Polymerization of butyl acr...

Embodiment 2

[0057] 1. Synthesis of star-shaped hexafunctional initiator dipentaerythritol hexa(α-bromoisobutyrate)

[0058] The specific steps are the same as the trimethylolpropane three (α-bromoisobutyrate) of the star-shaped trifunctional initiator, and the trimethylolpropane is replaced by dipentaerythritol to obtain dipentaerythritol hexa(α-bromoisobutyrate). ), the structure is as follows:

[0059]

[0060] 2. Polymerization of butyl acrylate initiated by dipentaerythritol hexa(α-bromoisobutyrate)

[0061] Add 12.8 g of butyl acrylate BA, 1.37 g of dipentaerythritol hexa(α-bromoisobutyrate) and (CuBr 2 ) 0.6381 g , (Me 6 TREN) 0.232 g, (Sn(EH) 2 ) 0.81 g, mixed solvent toluene 4g and anisole 1g, after mixing evenly, nitrogen bubbles for 30 minutes to remove oxygen; reaction temperature 70°C, time 12h, remove catalyst, solvent, etc. after the reaction to obtain a star polymer. Using gel permeation chromatography (GPC) test, number average molecular weight 8100, molecular weigh...

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Abstract

The invention discloses a star-shaped cationic graphene dispersant and its application. A star-shaped polymer is obtained by using a star-shaped initiator to initiate the polymerization of an acrylate monomer; under an inert atmosphere, the star-shaped polymer is reacted with an imidazole compound to obtain a star-shaped graphene Cationic graphene dispersant. The star-shaped cationic graphene dispersant is added into the solvent, and then the graphene is added to disperse to obtain a graphene dispersion system. The dispersant prepared by the invention is a star-shaped polymer with a special topological structure, strong entropy protection, obvious steric hindrance, and obvious advantages in dispersing graphene compared with linear polymers.

Description

technical field [0001] The invention belongs to the field of nano-graphene materials, in particular to a preparation method and application of a star-shaped cationic graphene dispersant. Background technique [0002] In 2004, two British scientists stripped graphene from graphite by mechanical stripping method, and won the Nobel Prize in Physics in 2010. Graphene is a monoatomic layer of graphite, the thinnest known material. Graphene is a hexagonal honeycomb-shaped two-dimensional material composed of carbon atoms with sp2 hybrid orbitals. It has many excellent properties, such as: electrical conductivity is 100 times that of silicon, thermal conductivity is more than ten times that of copper, hardness It is harder than diamond and so on. The excellent performance of graphene determines that it has a wide range of applications in many fields. However, the current industrialization process of graphene is not smooth. There are two main reasons: one is that the original str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/30C08F120/18C08F4/00C01B32/194
CPCC08F4/00C08F8/30C08F120/18C01B32/194
Inventor 陈俊李烈刚
Owner 中润超油(北京)新材料有限公司
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