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Heat-conductive composite material and preparation method thereof

A technology for thermally conductive composite materials and base materials, applied in the field of polymer materials, can solve the problems of high cost, affect the mechanical properties of composite materials, low thermal conductivity, etc., and achieve the effects of low cost, good thermal conductivity and simple preparation method.

Inactive Publication Date: 2015-06-10
SHENZHEN HALCYON NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal conductivity of filled polymer composites mainly depends on the thermal conductivity of the filler, the distribution of the filler in the matrix and the interaction with the matrix. thermal conductivity, but the larger the mass proportion of inorganic fillers, the easier it is to affect the mechanical properties of the composite material. In the case of the same weight percentage, the use of nano-scale fillers can significantly improve the thermal conductivity of the composite material, but the nano-scale The cost of the filler is relatively high. Considering the comprehensive cost and material performance, the thermal conductivity of the thermally conductive composite material filled with the electrodeless thermally conductive filler is generally low.

Method used

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

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Embodiment 1

[0019] This embodiment provides a thermally conductive composite material, which is prepared by the following method:

[0020] In parts by weight, 12 parts of PVA powder and 90 parts of PC plastic particles are weighed, the PVA powder and PC plastic particles are added together in the feed barrel of the twin-screw extruder, and then the cover of the feed barrel is covered. Fill the feeder with nitrogen, set the extrusion temperature of the twin-screw extruder at 210°C to 250°C, evacuate the middle section and the end section of the extruder, control the appropriate extrusion speed, and extrude to granulate.

[0021] In terms of weight percentage, in the prepared thermal conductive composite material, the content of PVA in-situ carbide with conjugated double bond carbon chain structure is 10%, and the content of PC plastic base material is 90%.

Embodiment 2

[0023] This embodiment provides a thermally conductive composite material, which is prepared by the following method:

[0024] In parts by weight, take 109 parts of PVA powder and 10 parts of resin, add PVA powder and resin together in the feeding barrel of the screw extruder, then cover the cylinder cover of the feeding barrel to make the inside of the feeding barrel The material is isolated from the outside air, and at the same time, the inert gas is introduced into the feeding barrel from the air inlet hole of the feeding barrel, and the extrusion temperature of the twin-screw extruder is controlled at 240 ° C to 260 ° C. The middle section of the extruder and the Vacuum exhaust at the end stage, control the appropriate extrusion speed, and extrude to granulate.

[0025] In terms of weight percentage, in the prepared heat-conducting composite material, the content of the PVA in-situ carbide with a conjugated double bond carbon chain structure is 90%, and the content of the ...

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Abstract

The invention relates to a heat-conductive composite material which is characterized by comprising the following components by weight percent: 10-90% of PVA (Polyvinyl Acetate) in-situ carbide with a conjugated double bonds carbon chain structure and 10-90% of polymer binder with a melting point of 200-260 degrees, wherein the PVA in-situ carbide is uniformly scattered in the polymer binder. According to the invention, the polymer binder is mixed and dispersed with the PVA through a twin-screw extruder; and in the process of heating, blending and dispersing, the PVA in situ carbide forms a carbide with a conjugated double bonds carbon chain structure, as the conjugated double bonds carbon chain has an excellent heat conduction effect, the composite material has excellent heat conductivity accordingly.

Description

【Technical field】 [0001] The invention belongs to the technical field of polymer materials, and relates to a heat-conducting composite material and a preparation method thereof. 【Background technique】 [0002] Polymer materials such as plastic, rubber or resin are mostly poor conductors of heat. If it is necessary to increase the thermal conductivity of plastic, rubber or resin and other poor conductors, the more commonly used method is to fill thermally conductive fillers, such as alumina, aluminum nitride, etc. into polymer materials to improve the thermal conductivity of the material. Most of the preparation methods are adding thermally conductive fillers to the base material for mixing and then melt injection molding. The thermal conductivity of filled polymer composites mainly depends on the thermal conductivity of the filler, the distribution of the filler in the matrix and the interaction with the matrix. thermal conductivity, but the larger the mass proportion of i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L101/00C08L29/04
Inventor 欧阳星赖华林陈军
Owner SHENZHEN HALCYON NEW MATERIALS