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Spherical graphite thermally conductive filler, spherical graphite/polymer thermally conductive composite material and preparation method thereof

A technology for thermally conductive composite materials and polymer materials, which is applied in the treatment of dyed polymer organic compounds, heat exchange materials, dyed low-molecular-weight organic compounds, etc. Simple steps and good mechanical properties

Active Publication Date: 2019-09-17
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this chemical modification caused a significant decrease in thermal conductivity due to the creation of a large number of defects on the surface of the carbon material. For thermal conductivity applications, sometimes the gain outweighs the gain.

Method used

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  • Spherical graphite thermally conductive filler, spherical graphite/polymer thermally conductive composite material and preparation method thereof
  • Spherical graphite thermally conductive filler, spherical graphite/polymer thermally conductive composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Disperse 50g of spherical graphite in 200mL of 2% cetyltrimethylammonium bromide alcohol aqueous solution (the mass ratio of water and ethanol as a solvent is 9:1), mechanically stir for 1h, and then filter with suction. Wash 3 times with hot water, wash 2 times with ethanol, and then wash 2 times with water to obtain wet spherical graphite;

[0046] Add a small amount of it to 200mL graphene oxide aqueous dispersion with a mass fraction of 0.3% multiple times while it is wet, stir it magnetically for 2 hours, filter it with suction, and wash it with hot water for 3 times; dry and pulverize the product to obtain a graphene oxide package Spherical graphite powder, that is, spherical graphite thermally conductive filler;

[0047] Get the spherical graphite powder wrapped by 40g graphene oxide, mix with 160g polyamide-6 particles, extrude and granulate on a twin-screw extruder, to obtain spherical graphite / polyamide-6 with a mass fraction of spherical graphite thermally co...

Embodiment 2

[0052] Immerse 100g of spherical graphite in 300mL of polyethyleneimine aqueous solution with a mass fraction of 10%, mechanically stir for 30min, then suction filter, and wash with water twice to obtain wet spherical graphite;

[0053] Add it to 2L graphene oxide aqueous dispersion with a mass fraction of 0.2% several times in small amounts, keep vigorous mechanical stirring during the period, keep stirring for 30min after adding, then filter and wash 3 times with water, dry and pulverize the product Obtain spherical graphite powder wrapped in graphene oxide, i.e. spherical graphite thermally conductive filler;

[0054] Take 40g of the above powder, 50g of epoxy resin prepolymer, and 10g of curing agent, stir and mix evenly to form a thick slurry, pour it into a mold, cure at 80°C for 4 hours, and then cure at 160°C for 24 hours to obtain the mass fraction of spherical graphite thermally conductive filler 40% spherical graphite / epoxy thermally conductive composite material; ...

Embodiment 3

[0058] In the 250mL three-necked flask, add 150g mass fraction and be 10% polydiallyl dimethyl ammonium chloride aqueous solution and 50g spherical graphite, mechanical stirring impels the two to mix; Take out the air in the three-necked flask with a vacuum water pump, then Ventilate slowly and restore the air pressure, so that the aqueous solution of polydiallyldimethylammonium chloride with high viscosity can be fully adsorbed in the spherical graphite; after the aeration is completed, the mixed solution is suction-filtered and washed 5 times with water to obtain wet spherical graphite ;

[0059] Add it to 1L of graphene oxide aqueous dispersion with a mass fraction of 0.5% several times in small amounts, keep gentle mechanical stirring during the period, keep stirring for 30min after adding, then filter and wash 5 times with water; get wet graphene oxide Wrapped spherical graphite, that is, spherical graphite thermally conductive filler;

[0060] The spherical graphite wra...

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Abstract

The embodiments of the invention relate to a spherical graphite thermal-conduction filler and a preparation method thereof, and a spherical graphite / polymer thermal-conduction composite material and apreparation method thereof, wherein the spherical graphite thermal-conduction filler sequentially comprises spherical graphite, a coagulant and graphene oxide from inside to outside. The preparationmethod of the spherical graphite thermal-conduction filler comprises: mixing spherical graphite and a coagulant, and separating the spherical graphite adsorbing the coagulant from the coagulant; and mixing the spherical graphite adsorbing the coagulant and graphene oxide while wet, and separating. The spherical graphite / polymer thermal-conduction composite material is prepared from the following raw materials: the spherical graphite thermal-conduction filler and a polymer material. The preparation method of the spherical graphite / polymer thermal-conduction composite material comprises: mixingthe spherical graphite thermal-conduction filler and the polymer material, and compounding. According to the present invention, the spherical graphite / polymer thermal-conduction composite material uses the spherical graphite thermal-conduction filler, and has advantages of high thermal conductivity, good mechanical property, simple process and low cost.

Description

technical field [0001] The invention relates to a spherical graphite heat-conducting filler, a spherical graphite / polymer heat-conducting composite material and a preparation method thereof. Background technique [0002] Thermally conductive materials are widely used in electronics, energy, chemical industry, aerospace and other fields. Commonly used heat-conducting materials include metals, carbon materials, nitrides, oxides, and polymer heat-conducting composite materials. Among them, polymer heat-conducting composite materials have the advantages of low density, easy processing, easy forming, and corrosion resistance, and are one of the most widely used types. [0003] Polymer thermally conductive composite materials are composed of thermally conductive fillers and polymers. Commonly used thermally conductive fillers include metals, carbon materials, nitrides, and metal oxides. Studies have shown that the heat dissipation performance of polymer thermally conductive com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/10C08K9/04C08K9/02C08K3/04C09C1/46C09C3/06C09C3/08C09C3/10C09K5/14C08L77/06C08L63/00C08L29/04C08L27/06C08L23/12C08L55/02
Inventor 包晨露王慧慧张松迪刘明禹
Owner TIANJIN POLYTECHNIC UNIV