A high-temperature macromolecule PTC thermal resistor and its making method

A thermistor and polymer technology, applied in the field of grades, can solve the problems of resistance value increase, limit application, influence use, etc., and achieve the effect of improving the withstand voltage level

Inactive Publication Date: 2007-07-11
SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the withstand voltage level of the product by increasing the thickness of the product will inevitably increase the resistance value of the product, which greatly limits the application of PPTC products in the automotive field, and after repeated actions, especially for a long time in the protection state, the resistance after troubleshooting Compared with the value before protection, there will be a large increase in resistance, which seriously affects its use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A high-temperature polymer PTC thermistor, which is composed of a core material, a metal foil coated on both sides of the core material, a lead-out electrode welded on the outer surface of the metal foil, and an insulating layer coated on the outside. The core material is pressed by conductive polymer material, wherein thermosetting fluororesin and surface-treated layered silicate clay are added to the conductive polymer material. Wherein, the high molecular polymer is polyvinylidene fluoride, fusible polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, nylon 11, nylon 12, perfluoroethylene propylene, ethylene chlorotrifluoroethylene and its copolymer one or a combination thereof; the thermosetting fluororesin is in powder form, and its fluorine content is not less than 60%; the processing aids are carbon black dispersants, antioxidants, and crosslinking accelerators 1. One or a combination of coupling agents, the layered silicate clay is kaolin or montmoril...

Embodiment 2

[0040] Manufacture method is all identical with embodiment 1, just the formula of core material component is different, and this formula is: (by weight percentage %)

[0041] Polyvinylidene fluoride 40

[0042] Carbon black 40

[0043] Thermosetting fluororesin powder 1

[0044] Surface-treated layered silicate clay 10

[0045] Processing aids 9.

Embodiment 3

[0047]Manufacture method is all identical with embodiment 1, just the formula of core material component is different, and this formula is: (by weight percentage %)

[0048] Polyvinylidene fluoride 43

[0049] Carbon black 38

[0050] Thermosetting fluororesin powder 12

[0051] Surface-treated layered silicate clay 4

[0052] Processing aids 3.

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PUM

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Abstract

This invention relates to one high temperature macromolecule PTC heat sensitive resistance, which is made of conductive macromolecule materials by press, wherein, the materials is added with heat fluro-resin and the layer silicon salt clay through surface process; the formula is as: macromolecule polymer for 30 to 60 percent; carbon for 30 to 55 percent; heat fix fluro-resin for 0.5 to 20 percent; layer silicon salt for 25 to 25 percent; process aid for 0.1 to 10 percent; the macromolecule polymer is of polyvinylidene fluoride, melt politef, ethene perfluoroethylene polymer, nylon 11 and 12, fluorinated ethylenepropylene copolymer and chlorotrifluoroethylene.

Description

technical field [0001] The invention relates to a high-temperature-grade high-molecular PTC thermistor and a manufacturing method thereof, which relate to the manufacture of electronic components with conductive high-molecular polymer composite materials as the main raw material, and in particular to a method for improving the withstand voltage of the high-molecular PTC thermistor. level method. Background technique [0002] Generally, a positive temperature coefficient (PTC) phenomenon can be exhibited in a crystalline or semi-crystalline polymer composite material filled with conductive particles. That is, at lower temperatures, such conductors exhibit low resistivity, and when the temperature rises above the melting point of its polymer, which is the so-called "shutoff" temperature, the resistivity rises sharply. high. Current conventional polymer materials include polyethylene, polypropylene, polystyrene, EVA, EAA, EBA, and conductive fillers include carbon black, grap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02
Inventor 刘峰侯李明王军吴国臣连铁军刘正平
Owner SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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