A kind of preparation method of special graphene micro-sheet for thermally conductive plastics

A graphene micro-sheet and thermally conductive plastic technology, applied in the field of graphene materials, can solve problems such as dispersion, and achieve the effects of improving compatibility, improving utilization, and reducing electrical conductivity

Active Publication Date: 2018-03-06
内蒙古石墨烯材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The graphene microflakes prepared by the present invention can be directly added to heat-conducting plastics, which solves the current problem that graphene must be dispersed through a solution when applied to heat-conducting plastics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Mix 70 parts by weight of natural flake graphite, 10 parts by weight of nano-alumina, and 5 parts by weight of aqueous magnesium stearate through an expansion extruder for 30-50 minutes to obtain a premix;

[0031](2) Mix the premix obtained in step (1) with 20 mol / L urea solution at a mass ratio of 1:5, react at 60~80°C for 1~2h under stirring, and centrifuge to obtain After the precipitate is washed with absolute ethanol and dried, the urea intercalated graphite composite is obtained; then the urea intercalated graphite composite is pumped into the twin-screw vibrating extruder, and the twin-screw vibrating extruder is from the feed end to the discharge The grinding section, the intercalation section, and the stripping section are set in sequence at the end, and the temperature of the grinding section is controlled at 60~80°C; the temperature of the intercalation section is 150~180°C; the temperature of the stripping section is 180~360°C; The decomposition of urea...

Embodiment 2

[0035] Preparation method of graphene microchip composite material for concrete heat-conducting plastics:

[0036] (1) 80 parts by weight of natural flake graphite, 10 parts by weight of nano-aluminum nitride, and 5 parts by weight of sodium stearate were mixed for 30 to 50 minutes by an expanding extruder to obtain a premix;

[0037] (2) Mix the premix obtained in step (1) with 10 mol / L urea solution at a mass ratio of 1:8, react at 60~80°C for 1~2h under stirring, and centrifuge to obtain After the precipitate is washed with absolute ethanol and dried, the urea intercalated graphite composite is obtained; then the urea intercalated graphite composite is pumped into the twin-screw vibrating extruder, and the twin-screw vibrating extruder is from the feed end to the discharge The grinding section, the intercalation section, and the stripping section are set in sequence at the end, and the temperature of the grinding section is controlled at 60~80°C; the temperature of the inte...

Embodiment 3

[0041] Preparation method of graphene microchip composite material for wood heat-conducting plastics:

[0042] (1) Mix 80 parts by weight of natural flake graphite, 15 parts by weight of nano-boron nitride, and 10 parts by weight of aqueous zinc stearate through an expansion extruder for 30 to 50 minutes to obtain a premix;

[0043] (2) Mix the premix obtained in step (1) with the urea solution with a concentration of 15 mol / L at a mass ratio of 1:6, react at 60~80°C for 1~2h under stirring, and centrifuge to obtain After the precipitate is washed with absolute ethanol and dried, the urea intercalated graphite composite is obtained; then the urea intercalated graphite composite is pumped into the twin-screw vibrating extruder, and the twin-screw vibrating extruder is from the feed end to the discharge The grinding section, the intercalation section, and the stripping section are set in sequence at the end, and the temperature of the grinding section is controlled at 60~80°C; t...

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Abstract

The invention provides a method for preparing graphene nanoplatelets special for thermal conductive plastic. Natural flake graphite is taken as the main material, intercalation modification is conducted by means of urea, shear stripping is conducted by means of a twin-screw vibration extruder, a large amount of gas is discharged through quick decomposition of urea under the heating condition to achieve stripping of a large number of graphitic layers, and flake graphite is stripped layer by layer into the graphene nanoplatelets through temperature control in different stages, so that the structure defect of the graphene nanoplatelets is reduced and the heat conducting property of graphene is improved; then the graphene nanoplatelets are coated by means of organic microcapsules, so that the electrical conductivity of graphene is reduced, compatibility between the graphene nanoplatelets and thermal conductive plastic macromolecules is improved, the utilization rate of graphene is increased, and the application cost of graphene in thermal conductive plastic is reduced. The graphene nanoplatelets prepared with the mechanical stripping method are small in structure defect and high in heat conducting property, the whole process is safe and reliable, cost is low, environment friendliness is realized, and the market application value is remarkable.

Description

technical field [0001] The invention relates to the field of graphene materials, in particular to graphene materials for heat-conducting plastics, and in particular to a method for preparing graphene microchips for heat-conducting plastics. Background technique [0002] Since its discovery in 2004 by scientists Andre Heim and Konstantin Novoselov of the University of Manchester, graphene has been a hot topic of research. Graphene is a two-dimensional material with a honeycomb hexagonal planar structure formed by sp2 hybridization of a layer of carbon atoms. Its thickness is only 0.335nm, which is the thinnest material known in the world. Graphene has high mechanical modulus (1.0 TPa), thermal conductivity (5300 W / m K), specific surface area (2630 m 2 / g) and charge mobility (250,000 cm 2 / V•s), has potential application prospects in many fields such as energy, electronic materials, biomedicine, and environmental protection. [0003] Thermally conductive plastic has the ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/10C08K9/04C08K3/04C08L77/00
CPCC08K3/04C08K9/04C08K9/10C08K2201/003C08L77/00
Inventor 梁贺君
Owner 内蒙古石墨烯材料研究院
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