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Preparing method of magnetic functionalization graphene composite

A composite material and magnetic function technology, applied in the direction of magnetic materials, diamagnetic/paramagnetic materials, magnetic objects, etc., can solve the problems of unfavorable composite surface properties, uneven dispersion of graphene, unstable composite materials, etc. Low resistance, wide application range, easy coating effect

Active Publication Date: 2018-05-11
HUNAN INSTITUTE OF ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is not conducive to improving the surface properties of the composite material. The dispersion of graphene is not uniform, resulting in uneven heating. The composite material itself is unstable and prone to aging, which makes the scope of use severely restricted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of magnetic functionalized graphene composite material, comprising the following steps:

[0026] 1) At room temperature, the graphene microflakes and magnetic nanoparticles are mixed evenly by airflow dispersion, the dispersion time is 4 hours, and the mass ratio of magnetic nanoparticles to graphene microflakes is 1:1.2; the specific operation of airflow dispersion is : Put the graphene microchips and magnetic nanoparticles into the airtight container, and blow compressed air into the airtight container, so that the materials in the airtight container are in a fluidized state and fully mixed into a uniform material.

[0027] 2) At 65°C, the mixture obtained in step 1) was dispersed in an ethanol solvent by ultrasonic dispersion, and the dispersion time was 4 hours at 200w to prepare a solution with a solid content of 60%;

[0028] 3) Add silane coupling agent, auxiliary agent and maleic anhydride grafted polypropylene to the mixture of step 2) and ...

Embodiment 2

[0033] A preparation method of magnetic functionalized graphene composite material, comprising the following steps:

[0034] 1) At room temperature, the graphene microflakes and magnetic nanoparticles are mixed evenly by airflow dispersion, the dispersion time is 4 hours, and the mass ratio of magnetic nanoparticles to graphene microflakes is 1:1.2; the specific operation of airflow dispersion is : Put the graphene microchips and magnetic nanoparticles into the airtight container, and blow compressed air into the airtight container, so that the materials in the airtight container are in a fluidized state and fully mixed into a uniform material.

[0035]2) At 65°C, the mixture obtained in step 1) was dispersed in an ethanol solvent by ultrasonic dispersion, and the dispersion time was 4 hours at 250w to prepare a solution with a solid content of 70%;

[0036] 3) Add silane coupling agent, auxiliary agent and maleic anhydride grafted polypropylene to the mixture of step 2) and m...

Embodiment 3

[0041] A preparation method of magnetic functionalized graphene composite material, comprising the following steps:

[0042] 1) At room temperature, the graphene microflakes and magnetic nanoparticles are mixed evenly by airflow dispersion, the dispersion time is 4 hours, and the mass ratio of magnetic nanoparticles to graphene microflakes is 1:1.2; the specific operation of airflow dispersion is : Put the graphene microchips and magnetic nanoparticles into the airtight container, and blow compressed air into the airtight container, so that the materials in the airtight container are in a fluidized state and fully mixed into a uniform material.

[0043] 2) At 65°C, the mixture obtained in step 1) was dispersed in an ethanol solvent by ultrasonic dispersion, and the dispersion time was 4 hours at 210w to prepare a solution with a solid content of 65%;

[0044] 3) Add silane coupling agent, auxiliary agent and maleic anhydride grafted polypropylene to the mixture of step 2) and ...

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PUM

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Abstract

The invention relates to a preparing method of a magnetic functionalization graphene composite. The method includes the following steps of firstly, evenly mixing graphene microchips and magnetic nanoparticles in a gas flow dispersing mode; secondly, dispersing the mixture in an ethyl alcohol solvent in an ultrasonic dispersing mode; thirdly, adding a silane coupling agent, an additive and maleic-anhydride-grafted polypropylene to be evenly mixed; fourthly, preparing functionalization carbon material powder through a spray drying device; fifthly, sintering the carbon material powder to obtain the magnetic functionalization graphene composite. The composite using graphene and magnetic nanoparticles as the body has the advantages of being good in conductivity, small in internal resistance, uniform in graphene distribution and simple in coating.

Description

technical field [0001] The invention relates to a method for modifying a graphene material, in particular to a method for preparing a magnetically functionalized graphene composite material. Background technique [0002] Graphene is a two-dimensional periodic honeycomb lattice structure composed of a single layer of carbon atoms, and is the thinnest two-dimensional nanomaterial so far. Since Andre Geim and Kostya Novoselov first reported its micromechanical exfoliation preparation method in 2004, graphene has been known for its unique structure and excellent properties, such as high theoretical surface area, high charge mobility, and high Young's modulus. Quantity, high thermal conductivity, etc. have aroused widespread concern of scientists. [0003] Due to the potential applications in the fields of materials, chemistry, and biomedicine, such as magnetically oriented targeted drug carriers, magnetic resonance imaging, electrode materials, etc., the preparation and propert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/00H01F1/44C04B35/532C04B35/622
CPCC04B35/521C04B35/522C04B35/532C04B35/622C04B2235/616C04B2235/656H01F1/0018H01F1/0045H01F1/44
Inventor 张向华徐海清
Owner HUNAN INSTITUTE OF ENGINEERING
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