Preparation method of electrically conductive composite material with positive temperature coefficient effect

A conductive composite material, positive temperature coefficient technology, applied in the field of material processing, can solve the problems of poor processing performance, reduce material impact strength, increase system melt viscosity, etc., achieve good processing performance and mechanical properties, good PTC strength , the effect of low percolation threshold

Inactive Publication Date: 2007-05-30
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the metal used as the conductive filler is easily oxidized, which will make the conductivity of the conductive material and the strength of the PTC unstable after a period of time
The disadvantage of these two methods is that the content of carbon black used exceeds 20% by mass, and the percolation threshold of the composite material system is relatively large, and the previous patent also needs to irradiate the composite material system with microwaves.
Such a high filling of carbon black will bring some adverse effects, such as increasing the melt viscosity of the system and deteriorating processing performance; reducing the impact strength of the material; carbon black particles are easy to fall off, causing pollution in the clean room, etc.
Microwave irradiation of the system increases the preparation process and increases the cost of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] When polypropylene and low-density polyethylene are 40 / 60 and carbon black mass content is 7%, carbon black (particle diameter is 29nm) and low-density polyethylene and polypropylene are put together in internal mixer melt blending 12 ~15 minutes, the melting temperature is 180 ° C, the blend is molded into a film in a flat vulcanizer, the film thickness is 150 ~ 300 μm, and the PTC strength of the obtained conductive material is 3.9×10 3 .

Embodiment 2

[0022] When polypropylene and low-density polyethylene were 70 / 30 and carbon black mass content was 5%, put carbon black (particle size is 29nm) and low-density polyethylene and polypropylene together in the internal mixer and melt blending 12 ~15 minutes, the melting temperature is 180 ° C, the blend is molded into a film in a flat vulcanizer, the film thickness is 150 ~ 300 μm, and the PTC strength of the obtained conductive material is 2.3×10 4 .

Embodiment 3

[0024] When polypropylene and low-density polyethylene are 70 / 30 and carbon black mass content is 5%, first with low-density polyethylene and particle diameter be the carbon black of 29nm melt blending 6~7 minutes in internal mixer, then Add polypropylene to melt and blend for 5-6 minutes, the melting temperature is 180°C, the blend is molded into a film in a flat vulcanizer, the film thickness is 150-300 μm, and the PTC strength of the obtained conductive material is 1.6×10 4 .

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PUM

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Abstract

The invention discloses a making method of conductive composite material with positive-temperature coefficient effect, which comprises the following steps: (1) putting two blending polymers and conductive filler in the double-screw squeezing machine or sealed fusing machine to fuse 5-20 min with fusing temperature higher than fusing point of polymer by 10-50 deg.c; (2) moulding the blending material into film in the flat sulfurized machine.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a preparation method of a conductive composite material with a positive temperature coefficient effect. Background technique [0002] A characteristic of conductive composite materials with a positive temperature coefficient (PTC) effect is that the resistivity of the material increases with increasing temperature. Conductive polymer composite material is a functional polymer material formed by adding conductive substances to high molecular polymers through dispersion compounding, lamination compounding, and formation of surface conductive films. When adding conductive fillers to the polymer matrix to prepare conductive composites, the change of the conductivity of the composites is discontinuous within a certain concentration range of conductive fillers. As the filler content increases, the resistivity decreases slowly. When the filler content reaches a certain Wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/06C08L33/12C08L25/14C08K3/04C08K3/22B29C47/40B29C35/12B29C70/58B29C70/88
Inventor 张清华熊辉陈大俊
Owner DONGHUA UNIV
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