Unlock instant, AI-driven research and patent intelligence for your innovation.

Flake graphite-graphene heat conduction composite material and preparation method thereof, system and cooler

A heat-conducting composite material and flake graphite technology, applied in the field of flake graphite-graphene heat-conducting composite material and its preparation, can solve problems such as mechanical properties decline, limit the application of composite materials, etc., achieve low specific gravity, overcome poor comprehensive performance, performance improved effect

Pending Publication Date: 2018-07-17
PEKING UNIV +1
View PDF6 Cites 7 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Flake graphite-graphene heat conduction composite material and preparation method thereof, system and cooler
  • Flake graphite-graphene heat conduction composite material and preparation method thereof, system and cooler
  • Flake graphite-graphene heat conduction composite material and preparation method thereof, system and cooler

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0059] According to the method for preparing flake graphite-graphene thermally conductive composite material according to the embodiment of the present invention, by using flake graphite and graphene mixed as a thermally conductive filler, graphene can be filled between flake graphite, small-sized graphene and large-sized flake graphite A three-dimensional heat conduction channel can be constructed synergistically, and the thermally conductive filler dispersion containing flake graphite and graphene and the polymer matrix dispersion are magnetically stirred, so that graphene and flake graphite can be evenly dispersed in the polymer matrix, so that the obtained composite The material has excellent thermal conductivity and mechanical properties, thereby overcoming the problem of poor comprehensive performance of graphene and flake graphite single-particle filled composite materials, and the composite material obtained in this application has an obvious advantage of low specific gr...

Embodiment 1

[0072] Mix 2g of flake graphite (300 microns in diameter) and 0.1g of graphene (20 microns in diameter) in 50ml of ethanol for 30 minutes to obtain a thermally conductive filler dispersion; 7.9g of polypropylene (PP) powder in 50ml of absolute ethanol Ultrasound for 30 minutes 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 nanosheet / flaky graphite dry material, then circulate the dry material in the twin-screw extruder for 4 minutes to fully disperse the filler in the polymer matrix, set the temperature of the upper and lower plates of the extruder to 190°C, and then put the The blended material is extruded into the barrel of the extruder, and then it is injection-molded on the injection molding machine. The barrel temperature of the injection molding machine is...

Embodiment 2

[0074] Mix 2g of flake graphite (300 microns in diameter) and 0.2g of graphene (20 microns in diameter) in 50ml of ethanol for 30 minutes to obtain a thermally conductive filler dispersion; 7.8g of polypropylene (PP) powder in 50ml of absolute ethanol Ultrasound for 30 minutes 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 nanosheet / flaky graphite dry material, then circulate the dry material in the twin-screw extruder for 4 minutes to fully disperse the filler in the polymer matrix, set the temperature of the upper and lower plates of the extruder to 195°C, and then put the The blended material is extruded into the barrel of the extruder, and then it is injection-molded on the injection molding machine. The barrel temperature of the injection molding machine is...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Film diameteraaaaaaaaaa
Film diameteraaaaaaaaaa
Thermal conductivityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a flake graphite-graphene heat conduction composite material and a preparation method thereof, a system and a cooler. The preparation method comprises the steps that 1, flake graphite and graphene are subjected to ultrasonic dispersion in ethyl alcohol, and heat conduction filler dispersion liquid is obtained; 2, a polymer matrix is subjected to ultrasonic dispersion in ethyl alcohol, and polymer matrix dispersion liquid is obtained; 3, the heat conduction filler dispersion liquid and the polymer matrix dispersion liquid are mixed and subjected to magnetic stirring, andmixed materials are obtained; 4, the mixed materials are dried, and the dried materials are obtained; 5, the dried materials are subjected to melt blending in an extruder, and a melt blending material is obtained; 6, the melt blending material is subjected to injection molding, and the flake graphite-graphene heat conduction composite material is obtained. Therefore, by means of the preparation method, the composite material with the excellent heat-conducting property and mechanical property can be obtained, and the composite material has the advantage of being obviously low in proportion compared with metal parts.

Description

technical field [0001] The invention belongs to the technical field of composite materials. Specifically, the invention relates to flake graphite-graphene heat conduction composite materials, a preparation method and system thereof, 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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08L23/12C08K7/00C08K3/04C09K5/14B29C45/00F28F21/02F28F21/06
CPCF28F21/02F28F21/06C09K5/14C08K3/04C08K7/00B29C45/0001C08K2201/011C08L23/12
Inventor 白树林任艳娟张亚飞丁天朋李金来
Owner PEKING UNIV