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Electrically conductive composite material possessing positive temperature coefficient

A conductive composite material and positive temperature coefficient technology, applied in the field of conductive polymer composite materials, can solve the problems of strict chemical cross-linking processing technology, damage to the mechanical properties of composite materials, high cross-linking requirements, etc., to achieve continuous work and The effects of long intermittent operation life, improved repetitive stability, and good thermal conductivity

Inactive Publication Date: 2006-07-12
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual cross-linking methods include chemical cross-linking, radiation cross-linking or silane cross-linking, etc. Although they are of great help to improve the electrical properties of materials, there are also some problems in practical applications: firstly, cross-linking has great influence on the process or Equipment has high requirements, for example, chemical cross-linking has strict requirements on processing technology, which is difficult to control during processing, and radiation cross-linking requires high-energy radiation sources, which are not available in general factories.
In addition, cross-linking also damages the mechanical properties of composite materials.

Method used

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  • Electrically conductive composite material possessing positive temperature coefficient
  • Electrically conductive composite material possessing positive temperature coefficient
  • Electrically conductive composite material possessing positive temperature coefficient

Examples

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Embodiment Construction

[0031] The present invention will be further described below through embodiments and accompanying drawings.

[0032] Examples 1-11 manufactured PTC conductive composite materials according to the above-mentioned specific steps and process conditions, and Comparative Examples 1-4 except that the conductive filler was not treated, other steps and process conditions were the same as in the examples. Following table 1, table 2 are the character of each component raw material used in embodiment and comparative example, and table 3 is the charging amount (by weight) of component raw material in each embodiment and comparative example, and table 4 is each embodiment And the performance of the product composite material of comparative example.

[0033] type

[0034] The average particle size

[0035] A1 / A2

[0036] Room temperature resistivity

[0037] *In order to characterize the PTC effect of the material or the characteristics of the r...

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Abstract

An electrically conductive composite high-molecular material with positive temp coefficient (PTC) for heater with self limitation of temp and over-current protection element is prepared through pre-treating the electrically conductive filler by reactive treating agent and chemically graft reaction between said filler, treating agent and high-molecular base body. Its advantages include high adhesive to metallic electrode, high PTC and high stability.

Description

technical field [0001] The invention relates to a conductive polymer composite material with a positive temperature coefficient (PTC) which is formed by modifying a conductive filler to fill a polymer or a resin matrix of a blend thereof by using an in-situ grafting method. Background technique [0002] A conductive polymer composite material with positive temperature coefficient characteristics composed of a single polymer matrix filled with unmodified conductive fillers such as carbon black, has adjustable conductivity in a wide range, easy to shape, and flexible , low cost and high PTC strength (≥10 5 ) and other characteristics (see: US4,514,620; US4,732,701; US5,164,133; CN87102932; CN87102924). On this basis, the PTC composite material (Chinese patent application: CN97108956) composed of a blended polymer matrix is ​​filled with an unmodified conductive filler, so that the stability of the PTC effect of the composite material is imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/00C08K3/04
Inventor 张明秋侯艳辉容敏智
Owner SUN YAT SEN UNIV
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