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Heat-conductive polyethylene composite material and preparation method thereof

A composite material and polyethylene technology, which is applied in the field of thermally conductive polyethylene composite materials and their preparation, can solve problems such as low thermal conductivity, achieve high mechanical properties, improve impact resistance, and improve heat dissipation effects.

Active Publication Date: 2014-09-17
BEIJING SINOREFINE AIR CONDITIONING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to provide a heat-conducting polyethylene composite material and its preparation method to solve the problem of low thermal conductivity of polyethylene composite materials in the prior art

Method used

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  • Heat-conductive polyethylene composite material and preparation method thereof
  • Heat-conductive polyethylene composite material and preparation method thereof
  • Heat-conductive polyethylene composite material and preparation method thereof

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preparation example Construction

[0035] In addition, the present invention also provides a method for preparing a heat-conducting polyethylene composite material, which includes the following steps: S1. In parts by weight, 15-50 parts of polyethylene, 4-35 parts of heat-conducting fiber and 23-80 parts Parts of heat-conducting particles are mixed in a mixer to obtain a mixture; S2, extruding, pulling and granulating the mixture to obtain the heat-conducting polyethylene composite material. The application of fibrous thermally conductive fillers can form an overlapping network between different thermally conductive fibers, thereby forming a thermally conductive network. This enables the heat in the matrix to be transported out instantly through the heat conduction network, which is conducive to improving the heat conduction performance of the polyethylene composite material. At the same time, when the composite material is subjected to external force, such an overlapping network can use its own deformation to ...

Embodiment 1

[0042] In this embodiment, a heat-conducting polyethylene composite material is prepared.

[0043] Preparation raw materials:

[0044] raw material

Dosage (g)

parameters

polyethylene

40

Weight average molecular weight 4×10 5

carbon fiber long fiber

5

The fiber length is 1mm, and the thermal conductivity is 90w / (mk)

carbon fiber staple

3

The fiber length is 0.15mm, and the thermal conductivity is 90w / (mk)

expanded graphite

30

The initial expansion temperature is 260°C; the particle size is 200 mesh

flake graphite

3

Particle size 2000 mesh

glass fiber

5

Fiber length 50mm

Toughener (EPDM rubber)

10

--

[0045] Decabromodiphenyl ether

2.5

--

Antimony trioxide

0.5

--

Silane coupling agent (KH560)

1

--

[0046] Preparation Process:

[0047] The polyethylene and the toughening agent particles are sub...

Embodiment 2

[0053] In this embodiment, a heat-conducting polyethylene composite material is prepared.

[0054] Preparation raw materials:

[0055] raw material

Dosage (g)

parameters

polyethylene

30

Weight average molecular weight 8×10 5

carbon fiber long fiber

8

The fiber length is 3mm, and the thermal conductivity is 90w / (mk)

carbon fiber staple

5

The fiber length is 0.2mm, and the thermal conductivity is 90w / (mk)

expanded graphite

35

The initial expansion temperature is 260.℃; the particle size is 100.mesh

flake graphite

6

Particle size 2000 mesh

glass fiber

5

Fiber length 50mm

Toughener (ethylene-octene copolymer)

7

--

Decabromodiphenyl ether

2.5

--

Antimony trioxide

0.5

--

Silane coupling agent (KH560)

1

--

[0056] Preparation Process:

[0057] The polyethylene and the toughening agent particles are subjected ...

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Abstract

The invention provides a heat-conductive polyethylene composite material and a preparation method thereof. The composite material comprises the following components in parts by weight: 15 to 50 parts of polyethylene, 4 to 35 parts of heat-conductive fibers and 23 to 80 parts of heat-conductive granules. The heat-conductive fibers taken as heat-conductive filling materials are added into the polyethylene substrate, so that the heat-conductive polyethylene composite material is formed. Compared with granular heat-conductive filling materials, according to the composite material provided by the invention, after the fibriform heat-conductive fibers enter the polyethylene substrate, an overlapping state can be easily formed between the heat-conductive fibers and the polyethylene substrate, so that the formed overlapping network can easily pass through the whole polyethylene substrate; and thus, the heat in the substrate can be rapidly dispersed under the heat-conductive action of the overlapping network, thereby being favorable for improving the heat transfer efficiency of the composite material. Meanwhile, after the heat-conductive granules are added, the heat-conductive granules can be used for enwrapping joints among the different heat-conductive fibers, so that strong heat-conductive channels are formed among the heat-conductive fibers.

Description

technical field [0001] The invention relates to the field of polymer material processing, in particular to a heat-conducting polyethylene composite material and a preparation method thereof. Background technique [0002] With the development of science and technology, the electronic field and the LED field have increasingly higher requirements on the power and integration of devices. Correspondingly, high power and high integration make the heat generation of devices under normal working conditions higher and higher. This requires the device to have high heat transfer performance to achieve timely heat dissipation. As an important preparation material for these devices, the thermal conductivity of polymer materials has also been increasingly challenged. The polymer matrix used in most thermally conductive polymer composites today is polyphenylene sulfide and polyamide. However, these materials have poor processing properties or high prices, and are not suitable for large-s...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K9/06C08K7/06C08K7/14C08K7/24C08K3/04
CPCC08K3/04C08K7/06C08K7/14C08K7/24C08K9/06C08K13/06C08K2201/003C08K2201/004C08L23/06C08L23/16C08L23/0815
Inventor 冷鸿飞刘昕李学灿陈亮亮孙文倩
Owner BEIJING SINOREFINE AIR CONDITIONING TECH
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