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A thermoplastic polymer-based thermally conductive composite material and its preparation method

A thermoplastic polymer, thermally conductive composite material technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve problems such as increasing material cost, low thermal conductivity of composite materials, and inability to meet application requirements, and achieve high thermal conductivity. Effect

Inactive Publication Date: 2011-12-21
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the main problems in improving the thermal conductivity of polymer materials by filling plastics with thermally conductive fillers are: (1) In the case of low filling amount of thermally conductive fillers, the thermal conductivity of composite materials is not high; (2) this method often needs to A large amount of thermally conductive filler (generally above 40%) is added to the polymer matrix. In the case of high filling amount, although the thermal conductivity is significantly improved, the cost of the material will be greatly increased, and the mechanical properties and processability of the material will also be obvious. For example, if 30% graphite is added to PTFE, its tensile strength is only 0.44 times that of PTFE; when the mass content of graphite is 40%, the tensile strength of the thermally conductive material is only 5MPa, which cannot meet the engineering requirements at all. Requirements

Method used

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  • A thermoplastic polymer-based thermally conductive composite material and its preparation method
  • A thermoplastic polymer-based thermally conductive composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1kg PPS, 0.1kg graphite, 0.83kgPA6 and other processing aids are added to the twin-screw extruder at one time and blended (the volume ratio of PPS and PA6 is 50 / 50, and the graphite addition is 10% of the PPS mass), extruded The output temperature is 300°C, and the PPS-based thermal conductive composite material is obtained. The measured thermal conductivity of the PPS-based thermally conductive composite material is 0.5701W / mK, the tensile strength is 64.85MPa, the bending strength is 93.27MPa, and the impact strength is 32.34Kj / m 2 .

Embodiment 2

[0028] Add 1.3kg ABS, 0.13kg BN, and 1kg PC to the twin-screw extruder at one time for blending (the volume ratio of ABS and PC is 60 / 40, and the amount of graphite added is 10% of the mass of ABS), and the extrusion temperature is 280 °C, the ABS-based thermally conductive composite material was obtained; the measured thermal conductivity of the ABS-based thermally conductive composite material was 0.5209W / mK, the tensile strength was 52.73MPa, the bending strength was 58.91MPa, and the impact strength was 44.85Kj / m2 .

[0029] Comparative example 1: 1.2kgABS and 0.12kgBN were added to a twin-screw extruder for blending, and the extrusion temperature was 280°C to obtain an ABS / BN composite material. The measured thermal conductivity was 0.3073W / mK, and the tensile strength was 56.29MPa, bending strength is 61.24MPa, impact strength is 48.32Kj / m 2 .

[0030] By comparing the examples of the present invention with the comparative examples, it can be seen that, using the method...

Embodiment 3

[0032] Add 2kg PA6, 0.48kg aluminum powder, and 0.1kg PE to the twin-screw extruder at one time for blending (the volume ratio of PA6 and PE is 95 / 5, and the amount of graphite added is 20% of the mass of PA6), and the extrusion temperature is At 250°C, a PA6-based thermally conductive composite material was obtained; the measured thermal conductivity of the PA6-based thermally conductive composite material was 0.6427W / mK, the tensile strength was 58.49MPa, the bending strength was 81.94MPa, and the impact strength was 30.51Kj / m 2 .

[0033] Comparative example 1: 1.6kg PA6 and 0.32kg aluminum powder were added to the twin-screw extruder for blending, and the extrusion temperature was 250°C to obtain a PA6 / aluminum powder composite material. The measured thermal conductivity was 0.4193W / mK. The tensile strength is 61.86MPa, the bending strength is 92.58MPa, and the impact strength is 31.74Kj / m 2 .

[0034] By comparing the examples of the present invention with the comparati...

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Abstract

The invention discloses a thermoplastic polymer-based heat-conducting composite material, which belongs to the technical field of polymer materials. The thermoplastic polymer-based thermally conductive composite material provided by the present invention has a higher thermal conductivity when adding less thermally conductive filler; the thermally conductive composite material includes a thermoplastic polymer matrix and a thermally conductive filler, and also includes compatible polymers. The present invention introduces a polymer that is incompatible with the polymer matrix into the composite system, so that the thermally conductive filler is selectively distributed in one of the phases, thereby significantly increasing the packing density of the thermally conductive filler in the polymer component of this phase, thereby improving the The overall thermal conductivity of the material; when the ratio of the two is 50 / 50, the thermal conductivity of the material can reach the thermal conductivity when the amount of thermal conductive filler is doubled.

Description

technical field [0001] The invention relates to a thermoplastic polymer-based heat-conducting composite material and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] With the development of industry in recent years, the corrosion resistance, mechanical strength, electrical insulation performance and processing performance of thermal conductive materials are required, and traditional thermal conductive materials such as metals can no longer meet the application requirements in some fields. Polymer materials have the characteristics of light weight, chemical corrosion resistance, excellent forming and processing performance, excellent electrical insulation performance, excellent mechanical and fatigue properties, etc., but polymer materials themselves are mostly poor conductors of heat, and heat tends to concentrate in local areas and continue to increase , and the transfer between different regions of the polym...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L101/00C09K5/14C08L81/02C08L77/02C08L55/02C08L69/00C08L23/06C08K3/04C08K3/38C08K3/08
Inventor 王孝军杨杰陈建野张刚龙盛如
Owner SICHUAN UNIV
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