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Star-shaped cationic graphene dispersing agent and applications thereof

A graphene dispersant and cationic technology, applied in the direction of inorganic chemistry, non-metallic elements, carbon compounds, etc., can solve problems such as difficult dispersant interaction, achieve obvious steric hindrance, strong entropy protection, and improve agglomeration Effect

Active Publication Date: 2020-01-07
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-shaped cationic graphene dispersing agent and applications thereof
  • Star-shaped cationic graphene dispersing agent and applications thereof
  • Star-shaped cationic graphene dispersing agent and applications thereof

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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 dispersing agent and applications thereof. According to the dispersing agent, a star-shaped initiator initiates the polymerization of an acrylate monomer to obtain a star-shaped polymer; the star-shaped polymer reacts with an imidazole compound in an inert atmosphere to obtain a star-shaped cationic graphene dispersing agent; and the star-shaped cationic graphene dispersing agent is added into a solvent, graphene is added, and dispersing is performed to obtain the graphene dispersing system. According to the invention, the prepared dispersing agent is a star-shaped polymer, has a special topological structure, has strong entropy protection effect and obvious steric hindrance effect, and has obvious advantages in dispersion of graphenecompared 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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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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