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Anisotropic heat and electricity-conductive polymer composite material and preparation method thereof

A technology of electrical and thermal conductivity, composite materials, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of high processing conditions, high injection speed (high energy consumption, complex microstructure design, etc., to achieve the effect of enhanced shearing)

Active Publication Date: 2018-12-11
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the above method solves the problem of preparing functionalized anisotropic polymer composites by injection molding, the design of the microstructure of the material is relatively complicated, requiring multiple steps of structural design, and the formation of the multilayer structure of the composite strongly depends on the resin material. The choice, and must rely on extremely harsh processing conditions such as ultra-high injection speed (high energy consumption) to be able to achieve

Method used

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  • Anisotropic heat and electricity-conductive polymer composite material and preparation method thereof
  • Anisotropic heat and electricity-conductive polymer composite material and preparation method thereof
  • Anisotropic heat and electricity-conductive polymer composite material and preparation method thereof

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specific Embodiment approach

[0040] (1) Melt-blending the graphene nanoplatelet (GNP) and the polymer using a torque rheometer to ensure that the GNP is uniformly dispersed in the polymer, thereby preparing the polymer / GNP blend raw material; wherein, The mixing temperature of the torque rheometer is set to: 180-220°C;

[0041] (2) Ultra-high-speed pulverization of the blend raw material prepared in step (1) at room temperature, so that the polymer / GNP blend raw material is broken from a block into a polymer / GNP blend with a size of 80-500 mesh pellets for multi-melt multiple injection molding;

[0042] (3) The anisotropic polymer / GNP composite material with planar orientation GNP structure is prepared by multi-melt multiple injection molding, and a multi-melt injection mold cavity is adopted, and the multi-melt injection mold cavity has a main body Cavity 1, a drainage cavity 2 communicating with the main cavity is arranged above the main cavity; the thickness of the main cavity 1 is 1 mm, and the thick...

Embodiment 1

[0048] Isotactic polypropylene (iPP, grade PPH-T03, produced by China Maoming Petrochemical Company) and graphene nanoplatelets (Graphene nanoplatelet, GNP, grade GT-G03, produced by Xiamen Kaina Graphene Technology Co., Ltd., with a diameter of 5-20 μm , thickness 1-5nm) was added to the torque rheometer according to the mass ratio of 75:25 for blending, so that the GNP was uniformly dispersed in the PP matrix to obtain the blend raw material; then it was crushed at room temperature by a high-speed crushing device to obtain PP / GNP blend particles; finally, the PP / GNP composite material is prepared by multi-melt multiple injection molding. The cavity parameters and the specific molding process are:

[0049] (1) if figure 2 As shown in (a), the main cavity is designed as a thin-plate-shaped special-shaped cavity with variable cross-section, which is composed of cavity 1 and cavity 2, in which the drainage cavity 2 is rectangular on TD, the main cavity 1 is a thin plate, and t...

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Abstract

The invention belongs to the field of high polymer materials and relates to an anisotropic heat and electricity-conductive polymer composite material and a preparation method thereof. The invention provides a heat and electricity-conductive polymer composite material which is prepared from a polymer matrix and a two-dimensional heat and electricity-conductive filler through a multi-flux repeated injection molding process, wherein the two-dimensional heat and electricity-conductive filler is uniformly dispersed in the polymer matrix; the two-dimensional heat and electricity-conductive filler inthe composite material is parallel to a plane formed by the injection flow direction and the horizontal direction; the two-dimensional heat and electricity-conductive filler has a multilayer planar orientating direction along a normal direction; the horizontal direction is vertical to the injection flow direction; the normal direction is vertical to the plane formed by the injection flow direction and the horizontal direction. The composite material acquired according to the invention has anisotropic electricity conductivity and anisotropic heat conductivity, the preparation method is simpleand convenient, and the composite material can be continuously large-scale produced.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, in particular to an anisotropic two-dimensional conductive and thermally conductive functionalized polymer composite material and a preparation method thereof. Background technique [0002] With the rapid development of information technology, more and more attention has been paid to the heat dissipation of electronic devices with front-end Moore's Law. Therefore, the demand for functional materials with unidirectional conductivity and heat dissipation performance in the field of electronic technology is becoming increasingly strong. Polymer composites added with conductive and thermally conductive fillers (such as carbon black, carbon nanotubes, etc.) are increasingly used in the electrical conduction and Heat dissipation problem solved. In order to meet the unidirectional conduction and heat dissipation requirements of electronic devices, the research on the preparation of polymer-ba...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08K7/00C08K3/04C09K5/14
CPCC08K3/042C08K7/00C08K2201/001C08K2201/011C09K5/14C08L23/12
Inventor 杨鸣波黄炎昊刘正英陈瑞陈历波杨伟
Owner SICHUAN UNIV
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