High-heat-conductivity high-toughness composite material and preparation method thereof

A composite material and high toughness technology, which is applied in the field of high thermal conductivity and high toughness composite materials and their preparation, can solve the problems of poor thermal conductivity, high cost, and reduced mechanical properties of composite materials, and achieve improved thermal conductivity, high thermal conductivity and toughness. Effect

Active Publication Date: 2013-05-08
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the widely used granular and flaky thermally conductive fillers, increasing the content will reduce the mechanical properties of the composite material, which cannot meet the application in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 5 parts of granular Al 2 o 3 (particle size 5 μm), 30 parts graphite (particle size 20 μm), 1 part whisker SiC (diameter 3 μm, aspect ratio 10) and 0.3 part titanate coupling agent NDZ101 were added to a high-speed mixer for surface treatment. Then the treated thermally conductive filler was mixed with 100 parts of high-density polyethylene (JHMGC100S) and 5 parts of POE (KC170, LG Chemical) into a high-speed mixer, and extruded with a twin-screw extruder. The thermal conductivity of the prepared high thermal conductivity and high toughness composite material is 1.6W / (m﹐K), the tensile strength is 26.3 MPa, and the impact strength is 36.3kJ / m 2 .

Embodiment 2

[0027] Add 1 part of granular ZnO (particle size 3 μm), 30 parts of graphite (particle size 10 μm) and 5 parts of whisker-like MgO (diameter 3.5 μm, aspect ratio 10) and 0.3 parts titanate coupling agent NDZ101 and mix at high speed Machine surface treatment. Then the treated thermally conductive filler was mixed with 100 parts of high-density polyethylene (5000S) and 5 parts of POE (8200, DuPont, USA) into a high-speed mixer, and extruded with a twin-screw extruder. The thermal conductivity of the prepared high thermal conductivity and high toughness composite material is 1.4W / (m﹐K), the tensile strength is 26.1 MPa, and the impact strength is 36.1kJ / m 2 .

Embodiment 3

[0029] Add 10 parts of granular AlN (particle size 4 μm), 30 parts of graphite (particle size 20 μm), 5 parts of whisker ZnO (diameter 3 μm, aspect ratio 10) and 0.3 parts of titanate coupling agent NDZ101 into the high-speed mixer in surface treatment. Then the treated thermally conductive filler was mixed with 100 parts of high-density polyethylene (JHMGC100S) and 5 parts of EVA (2805, Altfina, France) into a high-speed mixer, and extruded with a twin-screw extruder. The thermal conductivity of the prepared high thermal conductivity and high toughness composite material is 1.5W / (m﹐K), the tensile strength is 26.6 MPa, and the impact strength is 34.6kJ / m 2 .

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Abstract

The invention discloses a high-heat-conductivity high-toughness composite material which is prepared from the following ingredients in parts by mass: 100 parts of matrix resin, 1-10 parts of a granular heat conductivity filler, 25-40 parts of a flake heat conductivity filler, 1-10 parts of a crystal whisker heat conductivity filler, 1-10 parts of a toughening agent and 0.1-0.5 part of a coupling agent. The invention further discloses a preparation method of the high-heat conductivity high-toughness composite material. A main body of a three-dimensional heat conductivity network is formed by graphite in the material; the crystal whisker heat conductivity filler penetrates through a resin layer and then is connected with graphite heat conductivity layers which are isolated by the resin; and the granular heat conductivity filler generates more mutual particle contact points. Thus, as the heat conductivity fillers of different shapes are effectively stacked, more heat conductivity paths are formed, and the heat conductivity property of the composite material is effectively improved; and meanwhile the granular heat conductivity filler and the crystal whisker heat conductivity filler have the toughening and enhancing functions on the composite material, so that the composite material has the advantages of high both heat conductivity and toughness.

Description

technical field [0001] The invention relates to a heat-conducting composite material, in particular to a high-heat-conducting and high-toughness composite material and a preparation method thereof. Background technique [0002] The polymer matrix material basically has no uniform and dense ordered crystal structure or charge carriers required for heat transfer, and its thermal conductivity is relatively poor. In order to improve its thermal conductivity, it can be solved in two ways: one is to prepare structural thermally conductive polymer materials, and the other is to add thermally conductive fillers. The preparation process of the first method is cumbersome, difficult and costly. However, the method of adding heat-conducting fillers to the matrix has simple processing technology and relatively low cost. [0003] For filled thermally conductive polymers, the thermal conductivity depends on the composite state between the polymer matrix and the thermally conductive fille...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/08C08K9/04C08K3/22C08K3/28C08K3/04C08K7/10C08K7/08
Inventor 周正发徐芳林徐卫兵任凤梅马海红
Owner HEFEI UNIV OF TECH
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