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Method for preparing heat-conductive composite material

A technology of heat-conducting composite materials and heat-conducting fillers, applied in the field of preparing heat-conducting composite materials, can solve problems such as low production efficiency, poor mechanical properties, and good mechanical properties, and achieve the effects of improving mechanical properties, improving dispersion, and increasing thermal conductivity

Active Publication Date: 2014-04-30
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of solvent is required in the process of treating the thermally conductive filler with a coupling agent, and the treatment time is long and drying at a high temperature is required, resulting in high energy consumption
In addition, some people abroad have studied to improve the thermal conductivity through different processing methods [Agari Y, Xu G. J. Appl. Polym. Sci. 1991, 42, 1665-1669], and found that the products obtained by direct molding method have the highest thermal conductivity, but the mechanical Poor performance and low production efficiency; the thermal conductivity is the lowest when melt processing is used, but the mechanical properties are better

Method used

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  • Method for preparing heat-conductive composite material
  • Method for preparing heat-conductive composite material
  • Method for preparing heat-conductive composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A raw material of a polyethylene-based heat-conducting composite material includes the following components and contents in parts by weight:

[0050]

[0051] The first step, at first prepare raw materials by above-mentioned components;

[0052] In the second step, first place the thermally conductive filler boron nitride in an oven at 100 °C for 6 hours;

[0053] In the third step, the dry boron nitride and high-density polyethylene obtained in the second step are pre-mixed in a high-density polyethylene mixer for 5 minutes at a speed of 100 rpm to obtain a thermally conductive filler and high-density polyethylene premix ;

[0054] Then, put the obtained thermally conductive filler and high-density polyethylene premix into a twin-screw extruder for melt blending, extrusion, and granulation to obtain premixed composite particles of high-density polyethylene and boron nitride. The pellets were dried in a forced air oven at 100°C for 3 hours. The temperatures of fee...

Embodiment 2

[0061] A raw material of a polyethylene-based heat-conducting composite material includes the following components and contents in parts by weight:

[0062]

[0063] The first step, at first prepare raw materials by above-mentioned components;

[0064] In the second step, first place the thermally conductive filler boron nitride in an oven at 100 °C for 6 hours;

[0065] In the third step, the dry boron nitride and high-density polyethylene obtained in the second step are pre-mixed in a high-density polyethylene mixer for 5 minutes at a speed of 100 rpm to obtain a thermally conductive filler and high-density polyethylene premix ;

[0066] Then, put the obtained thermally conductive filler and high-density polyethylene premix into a twin-screw extruder for melt blending, extrusion, and granulation to obtain premixed composite particles of high-density polyethylene and boron nitride. The pellets were dried in a forced air oven at 100°C for 3 hours. The temperatures of fee...

Embodiment 3

[0072] A raw material of a nylon-6 base heat-conducting composite material includes the following components and contents in parts by weight:

[0073]

[0074] The first step, at first prepare raw materials by above-mentioned components;

[0075] In the second step, dry the thermally conductive filler boron nitride in an oven at 100 °C for 6 hours; place nylon-6 in a blast oven at 100 °C for 3 hours;

[0076] In the third step, the dry boron nitride obtained above and dry nylon-6 are placed together in a high mixer for premixing for 5 minutes at a speed of 100 rpm to obtain a thermally conductive filler and nylon-6 premix;

[0077] Then, put the obtained thermally conductive filler and nylon-6 premix into a twin-screw extruder for melt blending, extrusion, and granulation to obtain premixed composite particles of nylon-6 and boron nitride, and premix the composite particles in the Dry in a blast oven at 100°C for 3 hours. The temperatures of feed port, conveying section, ...

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Abstract

The invention discloses a method for preparing a heat-conductive composite material, wherein a crystalline polymer and a heat-conductive filling material are used as the raw materials; the crystalline polymer and the heat-conductive filling material are mixed according to the weight ratio of (50-80):(50-20); in the event of processing, polymer melt flows through a strong-shearing flow field; the dispersed state of the filling material in a polymer matrix is improved; more mutual contact heat-conductive network structures including the heat-conductive filling material, polymer crystal and the heat-conductive filling material are formed, and therefore, the heat-conductive coefficient of the composite material can also be greatly increased. On the basis of the existing traditional extrusion equipment, a bidirectional tensile mixer is additionally arranged; and the method for preparing the heat-conductive composite material prepared by the invention has the advantages of being simple to operate, continuous for production, convenient for operation control, steady in quality and high in production efficiency and has wide industrialization and market prospects.

Description

technical field [0001] The invention relates to a method for preparing a heat-conducting composite material, which belongs to the technical field of functional composite materials. Background technique [0002] Since polymer materials are insulators with extremely low thermal conductivity, their application in the field of heat conduction is largely limited. Therefore, polymer materials with high thermal conductivity and excellent comprehensive performance have been developed to further broaden the application of polymer materials in the field of thermal conductivity [Zhou Wenying, Qi Shuhua, Tu Chunchao. Plastic Industry, 2005, 33(B5): 99-102], which is of great significance. Especially in recent years, the vigorous development of high information industry, such as high heat dissipation interface materials and packaging materials widely used in electrical appliances and microelectronics fields, power tubes, integrated blocks, heat pipes, integrated circuits, Components su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B9/06B29C47/92B29C47/70C08L23/06C08K3/38C08L77/02B29C48/525B29C48/92
CPCB29C47/38B29C47/6012B29C48/92B29C2948/92704B29C48/04B29C48/395B29C48/911B29C2948/92895B29C2948/92904B29C48/40B29C48/525
Inventor 吴宏张先龙郭少云
Owner SICHUAN UNIV
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