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A high ptc-strength conductive composite material with isolation-double percolation structure, and preparation method and application thereof

A conductive composite material, double percolation technology, applied in the field of conductive composite materials with high PTC strength, can solve the problems of low PTC strength, poor stability, and high filling amount of conductive fillers, and achieve reduced percolation value, high stability, and improved The effect of conductivity

Active Publication Date: 2020-12-29
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the shortcomings of high conductive filler filling, low PTC strength and poor stability in the polymer / conductive filler composite conductive system in the prior art, the purpose of the present invention is to provide a high PTC strength with isolation-double percolation structure Conductive composite material, and its preparation method and application

Method used

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  • A high ptc-strength conductive composite material with isolation-double percolation structure, and preparation method and application thereof
  • A high ptc-strength conductive composite material with isolation-double percolation structure, and preparation method and application thereof
  • A high ptc-strength conductive composite material with isolation-double percolation structure, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] A conductive composite material with high PTC strength of isolation-double percolation structure, the conductive composite material is made from raw materials comprising the following components: 5g of linear low density polyethylene, 45g of polyvinylidene fluoride, 1g of conductive carbon black and antioxidant 10100.05g;

[0049] That is, the mass ratio of linear low density polyethylene and polyvinylidene fluoride is 1:9; the mass of conductive carbon black is 2% of the total mass of linear low density polyethylene and polyvinylidene fluoride; the mass of antioxidant 1010 is linear low 1% of density polyethylene mass.

[0050] Its preparation method comprises the following steps:

[0051] Dry linear low-density polyethylene and polyvinylidene fluoride in vacuum; add linear low-density polyethylene to an internal mixer at 150°C and melt for 2 minutes; then add conductive carbon black and antioxidant 1010 according to the above ratio, and melt Blend for 4 minutes to o...

Embodiment 2

[0054] A conductive composite material with high PTC strength of isolation-double percolation structure, the conductive composite material is made from raw materials comprising the following components: linear low density polyethylene 5g, polyvinylidene fluoride 45g, conductive carbon black 1.3 g and antioxidant 10100.05g;

[0055] That is, the mass ratio of linear low density polyethylene and polyvinylidene fluoride is 1:9; the mass of conductive carbon black is 2.6% of the total mass of linear low density polyethylene and polyvinylidene fluoride; the mass of antioxidant 1010 is linear low 1% of density polyethylene mass.

[0056] The preparation method is the same as in Example 1.

Embodiment 3

[0058] A kind of conductive composite material with high PTC strength of isolation-double percolation structure, this conductive composite material is made by the raw material that comprises following component: linear low density polyethylene 5g, polyvinylidene fluoride 45g, conductive carbon black 1.4 g and antioxidant 10100.05g;

[0059] That is, the mass ratio of linear low density polyethylene and polyvinylidene fluoride is 1:9; the mass of conductive carbon black is 2.8% of the total mass of linear low density polyethylene and polyvinylidene fluoride; the mass of antioxidant 1010 is linear low 1% of density polyethylene mass.

[0060] The preparation method is the same as in Example 1.

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Abstract

The embodiment of the invention relates to a conductive composite material with an isolation and double-percolation structure and high PTC strength, and a preparation method and application of the conductive composite material. The conductive composite material is prepared from raw materials comprising following components: linear low-density polyethylene, polyvinylidene fluoride, a conductive filler and an antioxidant. The preparation method of the conductive composite material comprises the following steps that the linear low-density polyethylene, the conductive filler and the antioxidant are fused and blended in an internal mixer, the temperature of the internal mixer is set to be 130-160 DEG C, and a clad master batch is prepared; then the polyvinylidene fluoride is added into the internal mixer, the temperature of the internal mixer is set to be 130-150 DEG C, and the clad master batch and the polyvinylidene fluoride are fused, blended and then taken out; and hot pressing is conduced to obtain the conductive composite material. The prepared CB / LLDPE / PVDF conductive composite material has the isolation and double-percolation structure, is low in conductive content, high in PTCstrength and high in stability, and can be used as a temperature-sensitive material.

Description

technical field [0001] The invention relates to the field of conductive polymer composite materials, in particular to a high-PTC-strength conductive composite material with an isolation-double percolation structure, as well as its preparation method and application. Background technique [0002] Composite conductive polymer materials (CPCs) are prepared by compounding one or several conductive fillers with one or several polymer matrices. The minimum critical content of conductive particles to form a conductive network is defined as the percolation threshold. However, the CPCs prepared in the prior art usually need to add a large amount of conductive filler, and the percolation threshold is relatively large. [0003] Lowering the percolation threshold has always been the focus and hotspot of CPCs research. There are many ways to reduce the percolation threshold. The combination of conductive fillers, isolation structure, and double percolation structure can all reduce the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/16C08L23/08C08K3/04
Inventor 段咏欣王彤彤张建明陈龙杨菲
Owner QINGDAO UNIV OF SCI & TECH
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