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Preparation method of star-shaped heat conducting filler with multiple heat conducting points

A technology of thermally conductive fillers and carbon nanotubes, applied in fibrous fillers, chemical instruments and methods, inorganic pigment treatment, etc., can solve problems such as low hybridization efficiency and unstable processing, and achieve improved dispersion performance, improved thermal conductivity, The effect of structural stability

Inactive Publication Date: 2013-02-06
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to study a star-shaped packing utilizing carbon nanotubes and carbon black chemically combined with multiple conductive hot spots to overcome the problem of low hybridization efficiency caused by unstable processing

Method used

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  • Preparation method of star-shaped heat conducting filler with multiple heat conducting points
  • Preparation method of star-shaped heat conducting filler with multiple heat conducting points
  • Preparation method of star-shaped heat conducting filler with multiple heat conducting points

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preparation example Construction

[0030] The embodiment of the present invention provides a method for preparing a star-shaped filler with multiple heat conduction points. The process flow is as follows: figure 1 Shown. The preparation method of the filler includes the following steps:

[0031] S1 Carbon black, carbon nanotube surface treatment

[0032] Carboxylation treatment on the surface of carbon black and carbon nanotubes: Use strong acids to carboxylate carbon black and carbon nanotubes.

[0033] Surface grafting and hydrolysis treatment of S2 carbon nanotubes

[0034] The surface treatment of the carbon nanotubes is carried out with a silane coupling agent, and the silane coupling agent is grafted to the surface of the carbon nanotubes under the action of the diimide substance.

[0035] The carbon nanotube grafted with the silane coupling agent is hydrolyzed in an ethanol solution to make the surface of the carbon nanotube bear hydroxyl groups.

[0036] Preparation and purification of S3 star packing

[0037] The...

Embodiment 1

[0047] The carbon black and carbon nanotubes were refluxed with concentrated nitric acid at 60°C for 4 hours respectively. The mass ratios of carbon black, carbon nanotubes and concentrated nitric acid were 1:10 and 1:5 respectively. After the reaction was completed, reflux with xylene for 4 hours , Filter with deionized water until it is neutral, and dry for later use. The carboxylated carbon nanotubes, KH540, and EDC were subjected to a mass ratio of 1:1:0.4 under nitrogen protection at 65°C in a water bath for 2 hours, and filtered with deionized water until neutral. Hydrolyze the carbon black grafted with silane in a 5:1 diluted ethanol solution for 2 hours, and then react with carboxylated carbon black and EDC at a mass ratio of 4:1:0.3 for 4 hours at 60°C after drying. The product is deionized The water and xylene are suction filtered until they are neutral to remove unreacted carbon black and carbon nanotubes. The star-shaped filler is made with a particle size of about ...

Embodiment 2

[0049] The carbon black and carbon nanotubes were refluxed with concentrated sulfuric acid at 100°C for 2 hours respectively. The mass ratios of carbon black, carbon nanotubes and concentrated nitric acid were 1:14 and 1:8 respectively. After the reaction was completed, reflux with xylene for 4 hours , Filter with deionized water until it is neutral, and dry for later use. The carboxylated carbon nanotubes, KH550, and DCC were subjected to a mass ratio of 1:1:0.2 under nitrogen protection at 65°C in a water bath for 2 hours, and filtered with deionized water until neutral. Hydrolyze the carbon black grafted with silane in a 5:1 diluted ethanol solution for 2 hours. After drying, react with carboxylated carbon black and DCC at a mass ratio of 6:1:0.5 at 70°C for 4 hours, and deionize the product. Water and xylene are suction filtered until they are neutral to remove unreacted carbon black and carbon nanotubes. The star-shaped filler is made with a particle size of about 5 micron...

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Abstract

The invention discloses a preparation method of a star-shaped heat conducting filler with multiple heat conducting points. The preparation method comprises the steps that surfaces of carbon black and a carbon nano-tube are treated; the carbon nano-tube is subjected to surface grafting and hydrolytic treatment; and the star-shaped heat conducting filler is prepared and purified. According to the preparation method, the carbon block is taken as an inner core, the carbon nano-tube is grafted to the surface of the carbon black by utilizing a simple chemical method, and the star-shaped heat conducting filler with the multiple heat conducting points is formed on the surface of the carbon black by utilizing high heat conductivity of the carbon nano-tube, so that a dispersion problem of the carbon nano-tube can be solved to a large extent, and the heat conducting effect can be improved.

Description

technical field [0001] The invention belongs to the technical field of high-performance powder material preparation, and in particular relates to a preparation method of a star-shaped heat-conducting filler with multiple conduction spots. Background technique [0002] Metal materials are good conductors of heat in the traditional sense. In common industrial products, a large number of metal materials are used to make heat conduction and heat dissipation devices. While meeting the heat conduction requirements, it also brings products with simple appearance and heavy weight. Resistance to chemical corrosion defects. With the advancement of science and technology, people's requirements for thermally conductive materials have been further improved. Light weight, easy processing and molding, impact resistance, chemical corrosion resistance, thermal fatigue resistance, excellent electrical insulation performance and chemical stability, etc. New requirements for thermally conducti...

Claims

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Application Information

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IPC IPC(8): C08K9/06C08K9/04C08K9/02C08K7/00C08K3/04C08L101/00C09C1/44C09C3/12C09C3/08C09C3/06
Inventor 徐睿杰雷彩红吴文德
Owner GUANGDONG UNIV OF TECH
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