Preparation method of conductive polymer composite material possessing positive temperature coefficient characteristics

A technology of conductive polymer and positive temperature coefficient, applied in the field of preparation of conductive polymer composite materials, can solve the problems of lower percolation threshold, complicated operation process, inability to improve toughness, etc., and achieves good compatibility, simple operation process, Effect of changing switch temperature

Inactive Publication Date: 2004-12-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The percolation threshold of the treated conductive composite material is reduced, the electrical performance indicators such as positive temperature coefficient strength are improved, and the amount of carbon black can be reduced while maintaining the positive temperature coefficient strength of the material, but the toughness cannot be improved.
It is more difficult to achieve the purpose of significantly improving the electrical properties, toughness and other mechanical properties of conductive composite materials, and at the same time it brings problems such as complicated operation process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Treatment of conductive carbon black At room temperature, the polyisoprene rubber epoxy-modified aqueous emulsion is based on the dry rubber contained therein, and the ratio with carbon black is 4: 100, and the degree of epoxidation is 50% polyisoprene rubber epoxy-modified water-based emulsion is sprayed and dispersed on the surface of carbon black stirred at high speed. The amount of water is less than 0.1%;

[0023] (2) Preparation of conductive composite materials Put polyethylene pellets into a rubber-plastic internal mixer, at a speed of 25 to 35 rpm and a temperature of 170°C, after plasticizing for 4 minutes, press polyethylene and conductive carbon black The weight ratio is 100:15. Add the surface-treated carbon black into the high-temperature plasticized polyethylene and continue to knead for 6 minutes; take it out and cool it to room temperature, and use a plastic crusher to make a high-conductivity high Molecular composite pellets. The obtained granule...

Embodiment 2

[0025] (1) Treatment of conductive carbon black At room temperature, the polyisoprene rubber epoxy-modified aqueous emulsion is based on the dry rubber contained therein, and the ratio with carbon black is 20: 100, and the degree of epoxidation is 25% polyisoprene rubber epoxy-modified water-based emulsion is sprayed and dispersed on the surface of carbon black stirred at high speed. The amount of water is less than 0.1%;

[0026] (2) Preparation of conductive composite materials Put polyethylene pellets into a rubber-plastic internal mixer, at a speed of 25 to 35 rpm and a temperature of 220°C, after plasticizing for 3 minutes, press polyethylene and conductive carbon black The weight ratio of the carbon black is 100:40. Add the surface-treated carbon black into the high-temperature plasticized polyethylene and continue to knead for 10 minutes; take it out and cool it to room temperature, and use a plastic crusher to make a high-conductivity high-conductivity material with a ...

Embodiment 3

[0028] (1) Treatment of conductive carbon black At room temperature, the polyisoprene rubber epoxy-modified aqueous emulsion is based on the dry rubber contained therein, and the ratio with carbon black is 15: 100, and the degree of epoxidation is 15% polyisoprene rubber epoxy-modified water-based emulsion is sprayed and dispersed on the surface of carbon black stirred at high speed. The amount of water is less than 0.1%;

[0029] (2) Preparation of conductive composite materials Put polyethylene pellets into a rubber-plastic internal mixer, at a speed of 25 to 35 rpm and a temperature of 190°C, after plasticizing for 3 minutes, press polyethylene and conductive carbon black The weight ratio is 100:30. Add the surface-treated carbon black to the polyethylene that has been plasticized at high temperature, and continue to mix for 15 minutes; take it out and cool it to room temperature, and use a plastic crusher to make a high-conductivity high-conductivity material with positive...

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Abstract

An electrically conductive high-molecular composition with positive temp coefficient is prepared through treating the surface of carbon black by the epoxy modified aqueous emulsion of polyisoprene rubber, drying, high-temp plasticizing of polyethene, high-temp pugging of said carbon black and polyethene, and granulating. It has the improved electric property and toughness.

Description

1. Technical field [0001] The invention belongs to the technical field of manufacturing conductive polymer composite materials, and in particular relates to a preparation method of conductive polymer composite materials with positive temperature coefficient characteristics. 2. Background technology [0002] Conductive polymer composite materials with positive temperature coefficient characteristics, showing thermosensitive electrical switching characteristics, can be used to manufacture self-limiting temperature heaters, overcurrent protection components, micro-current switches and other temperature-sensitive devices, etc., and ceramic-based positive temperature coefficient materials In comparison, it has the characteristics of easy molding, continuous processing, flexibility, light weight, and low cost. It has a broad application market in household appliances, petrochemicals, post and telecommunications, automobile industry, medical care, agriculture, forestry, animal husba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/04C08K9/04C08L23/06
Inventor 谢邦互杨鸣波杨伟李忠明冯建民
Owner SICHUAN UNIV
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