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Heat-conducting and insulated composite material based on carbon nanotubes and preparation method for composite material

A technology of carbon nanotubes and composite materials, which is applied in the field of thermally conductive and insulating composite materials based on carbon nanotubes and its preparation, which can solve the problems of poor fluidity, decreased mechanical properties, and inability to transfer composite materials, and achieve good insulation performance.

Inactive Publication Date: 2015-08-26
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polymer materials have the following disadvantages: except for the intrinsic type, most of them are poor conductors of heat. The heat is easy to concentrate in a local area and continue to increase, and it cannot be transmitted inside the polymer material. If this happens for a long time, the polymer material will be heated and fail.
However, this type of composite material has a high percolation threshold, poor thermal conductivity, and excessive inorganic fillers lead to poor fluidity of the composite material and a significant decline in mechanical properties.

Method used

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  • Heat-conducting and insulated composite material based on carbon nanotubes and preparation method for composite material
  • Heat-conducting and insulated composite material based on carbon nanotubes and preparation method for composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The thermally conductive and insulating composite material based on carbon nanotubes consists of the following components in parts by weight: 100 parts of polypropylene, 25 parts of boron nitride, 4.5 parts of multi-walled carbon nanotubes after treatment, 1 part of silicon-oxygen coupling agent, 0.3 parts of phenolic 1010, 2.5 parts of paraffin.

[0033] The preparation method of the above-mentioned thermally conductive and insulating composite material based on carbon nanotubes is as follows:

[0034] First dry polypropylene and boron nitride at 80°C, and then take the proportioned amount of each component and pass it through a twin-screw extruder at the temperature of each section at 160, 180, 195, 200, 200, 210 and 200°C Extrude and granulate, dry at 70-90°C, and then shape and prepare samples.

[0035] The thermal conductivity of the above-mentioned carbon nanotube-based thermally conductive and insulating composite material tested after sample preparation is 0.48...

Embodiment 2

[0037] The thermally conductive and insulating composite material based on carbon nanotubes consists of the following components in parts by weight: 100 parts of polypropylene, 40 parts of boron nitride, 3.5 parts of treated carbon nanotubes, 1.5 parts of silicon-oxygen coupling agent, phenols 0.4 parts of 1010, 3.5 parts of paraffin.

[0038] The preparation method of the above-mentioned carbon nanotube-based thermally conductive and insulating composite material is the same as that in Example 1.

[0039] The scanning electron microscope image of the thermally conductive and insulating composite material based on carbon nanotubes obtained in this embodiment is as follows figure 2As shown, due to the size distribution of the blended boron nitride in a certain range under the shear force, the boron nitride is uniformly dispersed in the matrix; in the scanning electron microscope image, the carbon nanotube conjugate system contains more electrons, and during the irradiation pro...

Embodiment 3

[0041] The thermally conductive and insulating composite material based on carbon nanotubes consists of the following components in parts by weight: 100 parts of polyphenylene sulfide, 45 parts of boron nitride, 3 parts of treated carbon nanotubes, and 1.5 parts of titanate coupling agent , 0.4 parts of phosphite ester 168, 3.5 parts of fatty acid lubricant.

[0042] The preparation method of the above-mentioned thermally conductive and insulating composite material based on carbon nanotubes is as follows:

[0043] First, dry polyphenylene sulfide and boron nitride at 90°C, and then take the proportioned amount of each component and pass it through a twin-screw extruder at the temperature of each section at 150, 300, 300, 290, 300 and 310°C Extrude and granulate, dry at 80-100°C, and then shape and prepare samples.

[0044] The thermal conductivity of the above-mentioned carbon nanotube-based thermally conductive and insulating composite material tested after sample preparati...

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Abstract

The invention discloses a heat-conducting and insulated composite material based on carbon nanotubes and a preparation method for the composite material. The composite material comprises the following components in parts by weight: 100 parts of a thermoplastic polymer, 10-70 parts of heat-conducting inorganic fillers, 1-7 parts of the carbon nanotubes, an antioxidant and a processing aid. The ratio of the inorganic fillers to the carbon nanotubes is determined and the carbon nanotubes with relatively large length-diameter ratios are connected with a plurality of isolated heat-conducting inorganic filler granules in the polymer, so that the carbon nanotubes and the inorganic filler granules form a three-dimensional network heat-conducting channel in the polymer; at the same time, the plurality of carbon nanotubes can be adsorbed on the same heat-conducting inorganic filler granule without contact, so that the composite material has relatively good mechanical property, heat-conducting property and insulation property.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a heat-conducting and insulating composite material based on carbon nanotubes and a preparation method thereof. Background technique [0002] With the simultaneous development of science and technology and industry, people have put forward higher requirements for materials. In addition to thermal conductivity, materials are also required to have light weight, excellent forming and processing performance, chemical corrosion resistance, excellent electrical insulation performance, high impact resistance, and mechanical properties. and excellent fatigue properties. Compared with metal materials, polymer materials have the advantages of low price, corrosion resistance, easy molding, electrical insulation, and good mechanical properties. They can also be recycled for secondary molding or surface treatment, which can further reduce the cost of polymer material products. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L91/06C08L81/02C08L77/02C08K13/06C08K9/02C08K7/24C08K3/38C08K5/134C08K5/526C08K3/22C08K5/18C08K5/098
CPCC08L23/12C08K3/22C08K3/38C08K5/098C08K5/18C08K5/526C08K7/24C08K9/02C08K13/06C08K2003/222C08K2003/2227C08K2003/385C08K2201/003C08K2201/004C08L91/06C08K13/02C08K5/541C08K5/1345C08L81/02C08L77/02
Inventor 王明周正勇郝永波张凯
Owner SOUTHWEST UNIVERSITY
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