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Thermally conductive fillers, thermally conductive compounds and heat sinks

A technology of thermally conductive composite materials and thermally conductive fillers, which is applied in the field of composite materials and can solve problems such as limiting the application of composite materials and decreasing mechanical properties

Active Publication Date: 2022-02-22
ENN GRAPHENE TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of flake graphite makes the composite material hard and brittle, and the mechanical properties decrease, which also limits the application of flake graphite filled polymer composites.

Method used

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  • Thermally conductive fillers, thermally conductive compounds and heat sinks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 2g flake graphite (diameter 300 microns), 0.1g graphene (diameter 20 microns), 0.02g phthalate plasticizer, 0.02g styrene-butadiene-styrene, 0.01g epoxy Ethane, 0.02g magnesium hydroxide and 0.01g polyethylene oxide were ultrasonically mixed in 50ml ethanol for 30min to obtain a thermally conductive filler dispersion; 7.9g polypropylene (PP) powder was ultrasonically mixed in 50ml absolute ethanol for 30min to obtain a polypropylene dispersion Then mix the thermally conductive filler dispersion and the polypropylene dispersion, stir in a magnetic stirrer for 4 hours, make it fully mixed, and then put it in an oven and keep it at 80°C for 3 hours to obtain PP / graphene nanosheets / flaky graphite Dry the material, and then circulate the dry material in the twin-screw extruder for 4 minutes to fully disperse the filler in the polymer matrix. Out of the barrel, it is then injection molded on an injection molding machine. The barrel temperature of the injection molding machine...

Embodiment 2

[0044] 2g graphite flakes (diameter 300 microns), 0.2g graphene (diameter 20 microns), 0.015g terephthalate plasticizer, 0.022g styrene-polyethylene / butyl-polyethylene block copolymer Compound, 0.02g basic lead carbonate, 0.018g melamine cyanuric acid complex salt and 0.015g polyether ester acetamide were ultrasonically mixed in 50ml of ethanol for 30min to obtain a thermally conductive filler dispersion. liquid; 7.8g polypropylene (PP) powder was ultrasonicated in 50ml of absolute ethanol for 30min to obtain a polypropylene dispersion, then the thermally conductive filler dispersion and the polypropylene dispersion were mixed and stirred in a magnetic stirrer for 4h to fully Mix evenly, then put it in an oven, keep at 80°C for 3 hours to obtain dry material of PP / graphene nanosheets / flaky graphite, then circulate the dry material in the twin-screw extruder for 4 minutes to fully disperse the filler in the polymer matrix, The temperature of the upper and lower plates of the ex...

Embodiment 3

[0046] 2.5g graphite flakes (diameter 300 microns), 0.2g graphene (diameter 20 microns), 0.01g epoxy plasticizer, 0.02g styrene-isoprene-styrene, 0.02g stearic acid Salt, 0.021g chlorinated polyethylene and 0.01g polyether ester amide were ultrasonically mixed in 50ml ethanol for 30min to obtain a thermally conductive filler dispersion; 7.5g polypropylene (PP) powder was ultrasonically mixed in 50ml absolute ethanol for 30min to obtain polypropylene Dispersion liquid, then mix the thermal conductive filler dispersion liquid and polypropylene dispersion liquid, stir in a magnetic stirrer for 4 hours, make it fully mixed, then put it in an oven, keep it at 80°C for 3 hours, and obtain PP / graphene nanosheets / scales Dry the material with graphite, then circulate the dry material in the twin-screw extruder for 4 minutes to fully disperse the filler in the polymer matrix. The barrel of the extruder is then injection molded on the injection molding machine. The temperature of the bar...

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Abstract

The invention discloses a thermally conductive filler, a thermally conductive composite material and a radiator. The thermally conductive filler includes flake graphite and graphene, wherein the graphene has a sheet diameter of 0.1 to 30 microns, and the flake graphite has a sheet diameter of 200-500 microns. Thus, the thermally conductive filler adopts flake graphite and graphene, graphene can be filled between flake graphite, and small-size graphene and large-size flake graphite can cooperate to construct a three-dimensional heat conduction channel, thereby applying it to composite materials It can improve the thermal conductivity and mechanical properties of composite materials.

Description

technical field [0001] The invention belongs to the technical field of composite materials, in particular, the invention relates to a thermally conductive filler, a thermally conductive composite material and a radiator. Background technique [0002] With the development of miniaturization and high power of electronic devices, the temperature inside the device has increased significantly, and thermal management has become a key factor determining its life and power. At present, in the heat conduction and heat dissipation industry, metal materials or alloys are traditionally used as heat conduction materials. Due to the characteristics of large proportion of metal heat conduction products, high machining cost, easy corrosion, and easy conduction, its further development in the field of heat conduction is limited. Polymers have attracted extensive attention in the field of thermal conductivity because of their good processability, low density, good chemical stability and insu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K3/04C08L23/12C08K13/02
CPCC08K3/04C08K3/042C08L23/12C08K2201/003C08K2201/011C08L2205/03
Inventor 丁天朋白树林任艳娟张亚飞李金来
Owner ENN GRAPHENE TECH CO LTD