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Method for preparing composite heat-conducting silicone grease from carbon nitride modified carbon nanotubes

A technology of nanotube compounding and heat-conducting silicone grease, which is applied in the direction of chemical instruments and methods, heat exchange materials, etc., to achieve industrial production, improve thermal conductivity, and high practical value

Active Publication Date: 2021-12-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Theoretical simulation calculations found that the thermal conductivity of carbon nitride is 14.1-111.9W m -1 K -1 between, and has good electrical insulation, it is expected to be used as a thermally conductive filler, but there are few reports so far

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of carbon nitride-modified carbon nanotubes: Disperse 0.5g of carboxylated carbon nanotubes and 5g of melamine in 200mL of water, shake for 12 hours, filter and dry, then put them into a tube furnace, the atmosphere is nitrogen , set the heating rate to 5° C. / min, heat up to 550° C. for 2 hours, and cool to room temperature to obtain carbon nitride-modified carbon nanotubes.

[0025] (2) Preparation of heat-conducting silicone grease: Weigh 1.2g of silicone oil and 7g of aluminum nitride with an average particle size of 30 microns, grind them evenly, put them into a planetary mixer, set the speed at 2000r / min, and take them out after vacuum stirring for 1 minute; Add 1.5g of aluminum nitride with an average particle size of 1 micron, put it into a planetary mixer after grinding, and take it out after vacuum stirring for 1 minute; then add 0.3g of carbon nanotubes modified by carbon nitride, put it into a planetary mixer after grinding Stirrer, vacuum sti...

Embodiment 2

[0028] (1) Preparation of carbon nitride-modified carbon nanotubes: Disperse 0.5 g of carboxylated carbon nanotubes and 3 g of 2,4-diamino-6-phenyl-1,3,5-triazine into 200 mL of methanol , shake for 12 hours, remove the solvent, put it in a vacuum oven and dry it for 12 hours, put the obtained mixture in a tube furnace, the atmosphere is nitrogen, set the heating rate at 5°C / min, raise the temperature to 370°C for 2 hours, and cool to Carbon nitride-modified carbon nanotubes were obtained after room temperature.

[0029] (2) Preparation of heat-conducting silicone grease: Weigh 1.5g of silicone oil and 6g of alumina with an average particle size of 30 microns, grind them evenly, put them into a planetary mixer, set the speed at 2000r / min, and take them out after vacuum stirring for 1 minute; add After grinding 1.5g of zinc oxide with an average particle size of 1 micron, put it into a planetary agitator, and take it out after vacuum stirring for 1 minute; add 0.5g of carbon ni...

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Abstract

The invention provides a method for preparing composite heat-conducting silicone grease from carbon nitride modified carbon nanotubes. A nitrogen-rich compound is adopted as a carbon nitride precursor, carbon nitride grows on the surface of a carbon nanotube in situ through a thermal polycondensation method, a carbon nitride modified carbon nanotube is prepared, and then the carbon nitride modified carbon nanotube is mixed with other heat-conducting filler and silicone oil to prepare the heat-conducting silicone grease. The modification of the carbon nitride can enhance the interface performance of the carbon nanotubes, improve the dispersity and addition amount of the carbon nanotubes in the silicone oil, and facilitate the formation of a heat-conducting passage in the heat-conducting silicone grease, thereby improving the heat-conducting capability of the heat-conducting silicone grease. On the other hand, the carbon nitride is used as an insulating material, so that the increase of the conductivity of the heat-conducting silicone grease caused by the carbon nanotubes can be remarkably reduced, and the preparation of the high-heat-conductivity and high-insulation heat-conducting silicone grease is facilitated. The method for modifying the carbon nanotubes by using the carbon nitride is simple and effective, low in cost and beneficial to industrialization.

Description

technical field [0001] The invention belongs to the technical field of thermal interface materials, and in particular relates to a preparation method of carbon nitride-modified carbon nanotube composite heat-conducting silicone grease. Background technique [0002] During the rapid development of modern electronic information technology, a prominent problem is the heat dissipation of electronic components. Due to the limitation of processing accuracy, there is inevitably a gap between the electronic chip and the heat sink, which increases the contact thermal resistance and affects the rapid heat transfer of the chip. Thermally conductive silicone grease is one of the thermal interface materials. Its main components are silicone oil and thermally conductive fillers, which are used to fill the gap between the chip and the heat sink, increase the contact area between the two, and significantly improve the heat dissipation effect. [0003] At present, the thermally conductive f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/14
CPCC09K5/14Y02P20/10
Inventor 李立东崔倩玲牛萍健
Owner UNIV OF SCI & TECH BEIJING
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