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Method for preparing polymer-based conductive composite material with low excess effusion value

A conductive composite material, percolation value technology, applied in conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problems of low stability, poor material processing performance and mechanical properties, poor compatibility, etc. High stability, good processability and mechanical properties, and low cost

Inactive Publication Date: 2005-10-26
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this type of system, the compatibility between the polymer matrix is ​​poor, the processability and mechanical properties of the material are not good, and the stability is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] At room temperature, slowly add conductive carbon black with a particle size of 50nm into a polyether polyurethane emulsion with a concentration of 15%. The particle size of the polyurethane emulsion is about 290nm. Then, the mixture was coated on an epoxy plate with comb-shaped electrodes and dried naturally at room temperature. The percolation value of the conductive composite material prepared by this method is 0.3%.

Embodiment 2

[0013] At room temperature, slowly add conductive carbon black with a particle size of 50nm to a polyester polyurethane emulsion with a concentration of 15%. The particle size of the polyurethane emulsion is about 280nm. Polyurethane emulsion, and then, this mixed solution is coated on the epoxy plate that has comb-shaped electrode and is dried naturally at room temperature. The percolation value of the conductive composite material prepared by this method is 0.5%.

Embodiment 3

[0015] Slowly add conductive carbon black with a particle size of 50nm to the polyether polyurethane emulsion with a concentration of 15% at room temperature. The particle size of the polyurethane emulsion is about 240nm. Then, the mixture was coated on an epoxy plate with comb-shaped electrodes and dried naturally at room temperature. The percolation value of the conductive composite material prepared by this method is 0.6%.

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Abstract

Naturally drying the mixed polyurethane emulsion and conduction carbon black makes the composite material. The prepared composite material possesses the advantages of low filtration value, favorable processability of material and mechanical property as well as high stability. Moreover, the method provides simple processing technique, low cost and safe environment protection.

Description

technical field [0001] The invention relates to a preparation method of a polymer-based conductive composite material with low percolation value. Background technique [0002] When conductive carbon black is added to the polymer matrix to prepare conductive composite materials, the change of the conductivity of the composite material within a certain range of carbon black concentration is discontinuous, and the conductivity will change suddenly at a certain concentration of carbon black, that is, when the carbon black When the black concentration reaches a certain value, carbon black forms a continuous conductive chain (conductive percolation grid of carbon black particles) in the polymer matrix. At this time, the critical volume fraction of carbon black particles is called percolation value. For conductive composite materials, a large percolation value means adding more conductive fillers, which may make the processing of the material difficult and affect the mechanical pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K3/04C08L75/04H01B1/24
Inventor 章明秋胡继文李明威程根水
Owner SUN YAT SEN UNIV