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A polymer-based insulating and heat-conducting composite material with both high-efficiency thermal conductivity and excellent mechanical properties

A technology of insulation and heat conduction and composite materials, which is applied in home appliances, other home appliances, applications, etc., can solve the problems of high thermal conductivity of conductive and thermal conductive fillers, loss of filling efficiency, and failure to reach, etc., to improve the conductive threshold seepage value , excellent mechanical properties, the effect of increasing the filling amount

Active Publication Date: 2017-10-24
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method also has an essential defect, that is, while shielding its electrical conductivity through the surface coating layer, the high thermal conductivity of the conductive and thermally conductive filler will also be greatly affected, and its filling efficiency will be lost (RSC Advances , 2013, 3, 17373-17379), and thus failed to achieve the expected effect

Method used

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  • A polymer-based insulating and heat-conducting composite material with both high-efficiency thermal conductivity and excellent mechanical properties
  • A polymer-based insulating and heat-conducting composite material with both high-efficiency thermal conductivity and excellent mechanical properties
  • A polymer-based insulating and heat-conducting composite material with both high-efficiency thermal conductivity and excellent mechanical properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Choose high-density polyethylene (5000s, produced by Yanshan Petrochemical Co., Ltd.), with a melt index of 1g / 10min (190°C, 2.16kg); graphite (325 mesh, Qingdao Xingyuan Graphite Milk Co., Ltd.), with a particle size of about 44 μm. High-density polyethylene and graphite are mixed in a high-speed stirrer at a weight ratio of 67:33, and then dried in a vacuum oven at 80°C for 12 hours after dispersion.

[0030] (2) Use the twin-screw extruder to mix and granulate the dried mixture to form a granular premix with a diameter of about 1mm and a length of about 3mm. The twin-screw feeding port, conveying section, melting section, uniform The temperatures of the chemical section and the die are 155°C, 195°C, 195°C, 195°C, and 190°C, respectively. The prepared granular premix was placed in a vacuum oven at 80°C and dried for 12 hours.

[0031] (3) Put the dried granular premix obtained above into the self-developed multi-stage stretching extrusion equipment (such as fig...

Embodiment 2

[0034] (1) Choose high-density polyethylene (5000s, produced by Yanshan Petrochemical Co., Ltd.), with a melt index of 1g / 10min (190°C, 2.16kg); graphite (325 mesh, Qingdao Xingyuan Graphite Milk Co., Ltd.), with a particle size of about 44 μm; silicon carbide (Qinhuangdao Yinuo High-tech Material Development Co., Ltd.), the particle size is about 2.9 μm. Among them, high-density polyethylene and graphite are mixed in a high-speed blender at a weight ratio of 67:33, and then silicon carbide accounting for 10% of the overall mass fraction is added, mixed again, dispersed, and dried in a vacuum oven at 80°C for 12 hours.

[0035] (2) Use the twin-screw extruder to mix and granulate the dried mixture to form a granular premix with a diameter of about 1mm and a length of about 3mm. The twin-screw feeding port, conveying section, melting section, uniform The temperatures of the chemical section and the die are 155°C, 195°C, 195°C, 195°C, and 190°C, respectively. The prepared granu...

Embodiment 3

[0039] (1) Choose high-density polyethylene (5000s, produced by Yanshan Petrochemical Co., Ltd.), with a melt index of 1g / 10min (190°C, 2.16kg); graphite (325 mesh, Qingdao Xingyuan Graphite Milk Co., Ltd.), with a particle size of about 44 μm; silicon carbide (Qinhuangdao Yinuo High-tech Material Development Co., Ltd.), the particle size is about 2.9 μm. Among them, high-density polyethylene and graphite are mixed in a high-speed blender at a weight ratio of 67:33, and silicon carbide accounting for 20% of the overall mass fraction is added, mixed again, dispersed, and dried in a vacuum oven at 80°C for 12 hours.

[0040] (2) Use the twin-screw extruder to mix and granulate the dried mixture to form a granular premix with a diameter of about 1mm and a length of about 3mm. The twin-screw feeding port, conveying section, melting section, uniform The temperatures of the chemical section and the die are 155°C, 195°C, 195°C, 195°C, and 190°C, respectively. The prepared granular p...

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Abstract

The invention discloses a polymer-based insulating and heat conducting composite material with efficient heat conductivity and excellent mechanical properties. The composite material is characterized in that in the preparation process, through a specific biaxial tensile force field, high dispersion of fillers in a composite system and complete orientation of anisotropic fillers can be effectively achieved, the quantity of the fillers can be increased, the integral heat conductivity of the material can be improved and the excellent mechanical properties of the material can be ensured. The greatest advantages of the composite material are that high filling of electricity and heat conducting fillers can be achieved and the integral insulativity of the material can be still maintained, thus the limitation of lower electricity conducting percolation threshold to the additive amount of the electricity and heat conducting fillers in an insulation system can be broken through and the advantage of high heat conductivity of the electricity and heat conducting fillers can be given play to. Meanwhile, the composite material has the advantages of simplicity in operation, convenience in control, continuous production and stable quality, has good industrialization capacity and market prospect and can be widely applied to preparation of plates, sheets and membrane materials with excellent mechanical properties and efficient insulativity and heat conductivity.

Description

technical field [0001] The invention relates to a polymer-based insulating and heat-conducting composite material with high-efficiency thermal conductivity and excellent mechanical properties and a preparation method thereof, belonging to the technical field of functional composite materials. Background technique [0002] With the development of electronic products in the direction of integration, light weight and high speed, the phenomenon of local heat release is particularly serious. It can be seen from previous studies that electronic devices are very sensitive to temperature. When the temperature has a small change, such as an increase of 10-15°C, its service life will be shortened by two times or more (Ceramics International, 2014, 40, 2047-2056). Therefore, how to prepare composite materials with efficient thermal conductivity and satisfy the mechanical properties of their use environment has become the top priority to promote their further development. It can be fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/00C08L77/00C08L67/00C08L71/00C08K3/22C08K3/14C08K3/34C08K3/04C08K7/24C08K3/08B29C47/92B29B9/06B29C48/92
CPCB29B9/06B29C48/92B29C2948/92704B29L2007/00C08J5/18C08J2323/06C08K3/04C08K3/34C08K2201/001C08K2201/003C08K2201/014C08L2203/16C08L2207/062C08L23/06
Inventor 吴宏张晓朦郭少云
Owner SICHUAN UNIV
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