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Conductive composite with positive temperature coefficient (PTC), preparation method and application thereof

A conductive composite material, positive temperature coefficient technology, applied in resistors with positive temperature coefficient, resistors with current response, etc., can solve the problems of poor adhesion, can not effectively reduce the overall resistance value, poor resistance reproducibility, etc. Adhesion, saving labor cost and raw material cost, effect of reducing resistance value

Inactive Publication Date: 2013-02-27
上海神沃电子有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] Oxygen-free ceramic powder does not have a concave-convex surface like carbon black, and its adhesion to polymers such as polyolefins is worse than that of carbon black, and its resistance reproducibility is poor
In order to increase the adhesion between polymers such as polyhydrocarbons and ceramic powders, conventional conductive composite materials using ceramic powders as conductive fillers will add a coupling agent, such as anhydride compounds or silane compounds, to strengthen polyolefin polymers. Adhesion with ceramic powder, however, the overall resistance cannot be effectively reduced after adding a coupling agent

Method used

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  • Conductive composite with positive temperature coefficient (PTC), preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Set the feed temperature of the batch mixer (Hakke-600) at 170°C, the feed program is to add a certain amount of high-density polyethylene 180G and ionomer 1 to 1.8g, and then add titanium carbide after stirring for 1 minute 1080, the mixing speed is set at 15rmp. After 2 minutes, immediately increase the speed to 60rmp. After continuing to knead for 5 minutes, the material was discharged to form a conductive composite material with a positive temperature coefficient.

[0050] The above composite material is then plasticized on an open mill, and peroxide 1 is added, with a mass of 1.8g, and drawn into a sheet of 10cm*20cm. Put a layer of Teflon release cloth on the top and bottom of the above materials, heat it for 2 minutes first, and pre-press the operating pressure at 10Kg / cm 2 , the temperature is 180°C, and the exhaust and pressurization are performed once. Press again, the time is 10 minutes, and the pressing pressure is controlled at 150kg / cm 2 , the temperatur...

Embodiment 2

[0052] The procedure for preparing the positive temperature coefficient element is the same as that of Example 1, except that the ionomer 1 is changed to 72 g, and the electrical properties of the positive temperature coefficient element are shown in Table 2.

Embodiment 3

[0054] The steps for preparing the positive temperature coefficient element are the same as in Example 2, except that ionomer 1 is replaced by ionomer 2, the mass is 72 g, and the electrical properties of the positive temperature coefficient element are shown in Table 2.

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Abstract

The invention provides a conductive composite with a PTC. The composite comprises a polymer, a conductive filler, an ionomer and a peroxide crosslinking agent. The ionomer and the peroxide are added into the composite, therefore the resistance of a chip can be reduced obviously, good heat shock resistance and environmental aging test performances are provided for a core material, simultaneously, not only the adhesiveness between the polymer and the conductive filler can be improved, but also the resistance can be reduced effectively.

Description

technical field [0001] The invention relates to a conductive polymer composite material, in particular to a conductive composite material with positive temperature coefficient (PTC), its preparation method and application. Background technique [0002] Generally speaking, the PTC (positive temperature coefficient) phenomenon of positive temperature coefficient can be exhibited in crystalline or semi-crystalline polymer composite materials filled with conductive particles. That is, at lower temperatures, such conductors exhibit low resistivity, which increases sharply when the temperature rises above the melting point, the so-called "shut-off" temperature. [0003] At present, positive temperature coefficient conductive composite materials are composed of one or more crystalline polymers and conductive fillers. The polymer is generally a polyolefin polymer, such as polyethylene, polyethylene graft polymer, polyvinylidene fluoride and copolyester, etc. The conductive filler ...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L51/06C08K3/28C08K3/14C08K5/14H01C7/02H01C7/13
Inventor 张爱丽史宇正侯李明任井柱
Owner 上海神沃电子有限公司
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