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Graphene/HDPE thermistor composite material and preparation method

A high-density polyethylene and composite material technology, applied in graphene/high-density polyethylene PTC thermistor composite material and preparation, polymer-based PTC thermistor composite material field, can solve the problem of low conductive filler content, carbon nanometer Tubes are easily entangled with each other, and PTC strength is low, so as to achieve the effect of high PTC strength, avoiding environmental pollution problems and high production efficiency

Active Publication Date: 2016-03-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, carbon nanotubes are easy to entangle with each other, and the conductive network formed when the matrix is ​​heated and expanded is not easy to break, so the PTC strength of the composite material is low, which makes it possible to develop materials with low conductive filler content, high PTC strength, and good cycle performance. Composites have a clear need

Method used

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  • Graphene/HDPE thermistor composite material and preparation method
  • Graphene/HDPE thermistor composite material and preparation method
  • Graphene/HDPE thermistor composite material and preparation method

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preparation example Construction

[0024] The preparation method of polymer-based PTC thermistor composite material of the present invention, the preparation steps of this composite material are as follows:

[0025] (1) Use a high-speed universal pulverizer to pulverize high-density polyethylene (HDPE) particles, the powder particle size is 100-500 μm, and then weigh a certain amount of pulverized HDPE and graphene according to the ratio (the particle size of graphene powder is 10 ~60μm), and finally mix the two evenly.

[0026] (2) Add the mixture obtained in step (1) into a torque rheometer and melt blend for 5-15 minutes at a temperature of 150-180° C. and a rotational speed of 80-100 r / min.

[0027] (3) Add an appropriate amount of the blend obtained in step (2) into a mold with a thickness of 0.1 to 3mm, preheat on a flat vulcanizing machine at a temperature of 150 to 180°C for 5 to 10 minutes, and hot press for 5 to 15 minutes at a pressure of 10 to 10 minutes. 15MPa, take it out after cooling to room te...

Embodiment 1

[0031] 48g high-density polyethylene powder and 0.48g (1wt%) graphene powder were premixed in a high-speed mixer at 3000rpm for 5 minutes to obtain a uniformly mixed graphene / high-density polyethylene composite powder. Then, the composite powder was blended with a torque rheometer at 160° C. and a rotational speed of 90 r / min for 10 minutes to obtain a blend of graphene and high-density polyethylene. Then the obtained blend was added to a mold with a thickness of 2mm, preheated on a flat vulcanizer at 160°C for 7 minutes, hot pressed for 10 minutes at a pressure of 12MPa, cooled to room temperature and taken out to obtain a composite sheet. After the material was shaped, it was taken out and cooled to room temperature; the prepared plate was put into a vacuum incubator for heat treatment, kept at 130°C for 18 hours, and then cooled to room temperature. However, due to the high resistance of the prepared PTC composite material at room temperature, there is no obvious PTC effect...

Embodiment 2

[0033] 47.01 g of high-density polyethylene powder and 1.50 g (3 wt%) of graphene powder were premixed in a high-speed mixer at a speed of 4000 rpm for 10 minutes to obtain a uniformly mixed graphene / high-density polyethylene composite powder. All the other preparation methods are the same as in Example 1. The resistance of the obtained PTC material is still large at room temperature, so there is no obvious PTC effect.

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Abstract

The invention relates to a polymer-based PTC (positive temperature coefficient) thermistor composite material, in particular to a graphene / high-density polyethylene PTC thermistor composite material and a preparation method thereof, and belongs to the field of high molecular composite materials. The composite material comprises a graphene conductive filler and a high-density polyethylene base body, wherein the weight percentage of the graphene in the components of the PTC thermistor composite material is 1%-10%. The preparation method comprises the following steps: grinding high-density polyethylene particles into powder by a high-speed universal grinder, mixing the powder with the graphene, performing melt blending through a torque rheometer, and finally performing hot-pressing by a press vulcanizer to prepare the graphene / high-density polyethylene PTC thermistor composite material. The polymer-based composite material taking the graphene as the conductive filler has the advantages of low initial resistance, high response speed, high PTC intensity, good circularity and the like, and can lay a foundation for an application of the graphene to a thermistor and indicate a direction for the application of the graphene.

Description

technical field [0001] The invention relates to a polymer-based PTC thermistor composite material, specifically a graphene / high-density polyethylene PTC thermistor composite material and a preparation method thereof, belonging to the field of functional polymer composite materials. Background technique [0002] PTC (positive temperature coefficient) material is a positive temperature coefficient heat-sensitive material, which has the characteristic that the resistivity increases with the increase of temperature. The resistivity of the material remains basically unchanged before the critical transition temperature, and when the temperature reaches a certain temperature, that is, the Curie temperature, the resistivity will increase rapidly within a narrow temperature range of a few degrees or more than ten degrees. 3 ~10 9 Magnitude. [0003] At present, the PTC materials used are mainly divided into BaTiO 3 , V 2 o 3 Mainly ceramic-based PTC materials and polymer-based P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08K3/04B29C43/58
CPCB29C43/58C08K3/04C08K2201/001C08L2207/062C08L23/06
Inventor 曾尤杨铖王函英哲任文才成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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