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Insulating and heat conducting polyamide composite material with high cost performance and preparation method thereof

An insulating and thermally conductive, composite material technology, applied in the field of composite materials, can solve the problems of difficult processing, expensive nitrides, and low thermal conductivity of composite materials.

Active Publication Date: 2012-07-25
NANJING JULONG SCI&TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To obtain insulating and heat-conducting materials, it is usually to add nitrides or fill high-content metal oxides, etc. Nitride is very expensive and the cost is high; while filling high-content inorganic fillers brings processing difficulties, and the obtained compound The thermal conductivity of the material is not too high, both methods have obvious defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of insulating and heat-conducting polyamide composite material, by weight percentage, comprises the following composition:

[0025] PA6: 82%, modified ordinary graphite: 10%, modified expanded graphite: 5%, modified mica: 2%, paraffin: 1%; antioxidant: 1010 (0.1%), 168 (0.15%), anti-oxidant The amount of oxygen agent added is 0.1% and 0.15% of the sum of PA6, modified ordinary graphite, modified expanded graphite, modified mica and paraffin. Ordinary graphite: the particle size is 5μm, the carbon content is more than 99%; the surface area of ​​expanded graphite is 250m 2 / g; the ratio of mica diameter to thickness is 50 times, and the particle size is 800 mesh.

[0026] Preparation of modified ordinary graphite: Add ordinary graphite and titanate coupling agent into a blender, and blend for 10 minutes at 50°C to obtain modified ordinary graphite. The amount of titanate coupling agent added is 1 / 2 of the weight of ordinary graphite 0.5%;

[0027] Preparation of...

Embodiment 2

[0035] A kind of insulating and heat-conducting polyamide composite material, by weight percentage, comprises the following composition:

[0036] PA6: 79%, modified ordinary graphite: 15%, modified expanded graphite: 10%, modified talc: 5%, paraffin: 1%; antioxidant: 1010 (0.1%), 168 (0.15%), anti-oxidant The amount of oxygen agent added is 0.1% and 0.15% of the sum of PA6, modified ordinary graphite, modified expanded graphite, modified talc and paraffin. The particle size of ordinary graphite is 5μm, and the carbon content is more than 99%; the surface area of ​​expanded graphite is 250m 2 / g; talc diameter-thickness ratio 50 times, particle size 800 mesh.

[0037] Preparation of modified ordinary graphite: Add ordinary graphite and silane coupling agent into a blender, blend at 60°C for 8 minutes to obtain modified ordinary graphite, and the amount of silane coupling agent added is 2.5% of the weight of ordinary graphite;

[0038] Preparation of modified expanded graphite...

Embodiment 3

[0046] A kind of insulating and heat-conducting polyamide composite material, by weight percentage, comprises the following composition:

[0047]PA6: 60%, modified ordinary graphite: 20%, modified expanded graphite: 7%, modified kaolin: 8%, paraffin: 5%; antioxidant: 1010 (0.15%), 168 (0.25%), anti-oxidant The amount of oxygen agent added is 0.15% and 0.25% of the sum of PA6, modified ordinary graphite, modified expanded graphite, modified talc and paraffin. The particle size of ordinary graphite is 5μm, and the carbon content is more than 99%; the surface area of ​​expanded graphite is 250m 2 / g; the diameter-thickness ratio of kaolin is 50 times, and the particle size is 800 mesh.

[0048] Preparation of modified ordinary graphite: Add ordinary graphite and aluminate coupling agent into a blender, and blend for 7 minutes at 70°C to obtain modified ordinary graphite. The amount of aluminate coupling agent added is 1 / 2 of the weight of ordinary graphite 3.5%;

[0049] Prepa...

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Abstract

The invention relates to a composite material, particularly to an insulating and heat conducting polyamide composite material with high cost performance and a preparation method of the composite material. The components are as follows by weight percentage: 40-95 of polyamide, 5-35 of common modified graphite, 1-10 of modified expanded graphite, 1-10 of a modified flake inorganic filler, 1-5 of a lubricant, and 0.1-1 of an antioxidant, and the sum of above components is 100%. The preparation method is as follows: adding the common modified graphite, the modified expanded graphite and the modified flake inorganic filler into a blending machine, blending for 5-10min at a temperature of 50-90 DEG C to obtain a modified heat conducting filler; adding polyamide, the modified heat conducting filler, the antioxidant and the lubricant into the blending machine, and blending for 5-10min; adding the uniformly mixed materials into a main feed hopper of a double screw extruder, and performing melt extrusion and granulation at a temperature of 230-260 DEG C. The composite material disclosed by the invention is good in insulating and heat conducting performance and good in comprehensive mechanical property.

Description

technical field [0001] The invention relates to a composite material, in particular to a cost-effective insulating and heat-conducting polyamide composite material and a preparation method thereof. Background technique [0002] In the field of electronic technology, as the integration of electronic circuits is getting higher and higher, the accumulation of heat is also increasing. The accumulation of heat causes the temperature of the electronic device to rise and the working stability to decrease. In the field of aerospace, due to the lack of heat conduction of air, the heat conduction of electronic devices must be considered. In the field of emerging LED industries, if the heat energy generated by LEDs cannot be exported, the junction temperature of LEDs will be too high, which will affect the product life cycle, luminous efficiency, and stability. At present, most LED heat sinks are made of aluminum. Due to the shortcomings of aluminum, such as conductivity, high densit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/00C08L77/02C08L77/06C08K13/06C08K9/04C08K9/06C08K3/04C08K7/24C08K3/34
Inventor 吴建国薛建峰李云岩
Owner NANJING JULONG SCI&TECH CO LTD
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