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Heat conduction composite material and preparation method thereof

A heat-conducting composite material, mass percentage technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve problems such as the decrease of impact strength and bending strength, and the decrease of mechanical properties of composite materials.

Active Publication Date: 2012-01-11
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the above analysis, the thermal conductivity of the thermally conductive composite material is significantly improved, and the volume filling fraction of the filler must be higher than the percolation value. However, due to the large amount of inorganic filler filling, the mechanical properties of the composite material decrease significantly.
Luo used SiC to fill epoxy resin. When the mass percentage of SiC was 50%, the thermal conductivity of the composite material was 0.7152W / m.K, but the impact strength and bending strength decreased significantly (Luo YJ; Dang J; Qi HY; LiHR Polymer-Plastics Technology and Engineering 2009, 48, 877)

Method used

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  • Heat conduction composite material and preparation method thereof
  • Heat conduction composite material and preparation method thereof
  • Heat conduction composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 220g of polyethylene (PE), 220g of polyethylene-vinyl acetate (EVA), add 7.5g of wetting agent, 2.5g of antioxidant and mix well in the mixer; add 50g of nano alumina to it, Stir and mix well in the mixer. The uniformly mixed materials are melt-extruded, cooled, drawn, and pelletized through a twin-screw extruder to prepare a thermally conductive composite material (sample 1).

[0019] Use PE alone as the matrix composite as a thermal conductivity control. Weigh 440 g of PE, add 7.5 g of wetting agent, and 2.5 g of antioxidant to mix well in the mixer; add 50 g of nano alumina to it, stir and mix well in the mixer. The uniformly mixed materials are melted and extruded through a twin-screw extruder, cooled, drawn, and pelletized to prepare a thermally conductive composite material (sample 2).

[0020] A blend of PE and EVA without adding nano-alumina was used as a mechanical performance control. Weigh 245g of PE, 245g of EVA, add 7.5g of wetting agent, and 2.5g of an...

Embodiment 2

[0028] Weigh 100g polyethylene (PE), 100g polyethylene-vinyl acetate (EVA), add 7.5g wetting agent, 2.5g antioxidant and mix well in the mixer; add 290g of nano alumina to it, Stir and mix well in the mixer. The uniformly mixed materials are melted and extruded through a twin-screw extruder, cooled, drawn, and pelletized to prepare a thermally conductive composite material (sample 4).

[0029] Use PE alone as the matrix composite as a thermal conductivity control. Weigh 200 g of PE, add 7.5 g of wetting agent, and 2.5 g of antioxidant to mix well in the mixer; add 290 g of nano alumina to it, and stir and mix well in the mixer. The uniformly mixed materials are melted, extruded, cooled, drawn, and pelletized through a twin-screw extruder to prepare a thermally conductive composite material (sample 5).

[0030] Take sample 3 as a mechanical performance control.

[0031] The thermal conductivity test adopts the HC-110 thermal conductivity meter manufactured by the American EKO Compa...

Embodiment 3

[0038] Weigh 122.5g of polyethylene (PE), 122.5g of polyethylene-vinyl acetate (EVA), add 7.5g of wetting agent, and 2.5g of antioxidant to mix well in the mixer; add 245g of nano alumina , Stir and mix well in the mixer. The uniformly mixed materials are melted, extruded, cooled, drawn, and pelletized through a twin-screw extruder to prepare a thermally conductive composite material (sample 6).

[0039] Use PE alone as the matrix composite as a thermal conductivity control. Weigh 245 g of PE, add 7.5 g of wetting agent, and 2.5 g of antioxidant to mix well in the mixer. Add 245 g of nano alumina to it, stir and mix in a mixer to be uniform. The uniformly mixed materials are melted, extruded, cooled, hauled, and pelletized through a twin-screw extruder to obtain a thermally conductive composite material (sample 7)

[0040] Take sample 3 as a mechanical performance control.

[0041] The thermal conductivity test adopts the HC-110 thermal conductivity meter manufactured by the Amer...

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Abstract

The invention belongs to the field of macromolecular / inorganic nanometer composite materials, and particularly relates to a heat conduction composite material prepared by taking a blend of two polymers capable of forming two-phase structures as a matrix and adding an inorganic nanometer heat conduction filler, and a preparation method for the heat conduction composite material. The method comprises the following steps of: stirring and mixing 40 to 88 mass percentage of polyethylene and polyethylene-vinyl acetate, 1.5 mass percent of wetting agent and 0.5 mass percent of antioxidant uniformly in a mixer; adding 10 to 58 mass percent of nanometer aluminum oxide into the mixture, and stirring and mixing uniformly in the mixer; and melting and extruding the uniformly-mixed raw materials from a screw extruder, cooling, dragging and cutting into particles to obtain the heat conduction composite material, wherein a mass ratio of the polyethylene to the polyethylene-vinyl acetate is 1:1. The heat conduction composite material has the advantages of low filling, high heat conductivity and high mechanical property.

Description

Technical field [0001] The invention belongs to the field of polymer / inorganic nano composite materials, and particularly relates to a thermally conductive composite material prepared by adding an inorganic nano thermally conductive filler to a blend of two polymers capable of forming a two-phase structure as a matrix and a preparation method thereof. Background technique [0002] With the development of science and technology, more and more functional requirements are placed on polymer materials. Polymer materials are often used as auxiliary materials related to electricity due to their high resistivity, excellent processability, light weight and low price. At present, due to the integration and high-speed of device functions, the long distance of electric energy transmission, and the increasing amount of heat per unit time and volume, the effective discharge of heat has become an urgent problem to be solved. The original low thermal conductivity polymer materials can no longer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L23/08C08L31/04C08K13/02C08K3/22C09K5/14B29B9/06
Inventor 马永梅张帅曹欣宇张静坤
Owner INST OF CHEM CHINESE ACAD OF SCI
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