A kind of preparation method of low percolation value high mechanical property polypropylene conductive film

Abstract

The invention discloses a preparation method of a conductive PP (polypropylene) thin film with a low percolation threshold and high mechanical properties. The preparation method comprises steps as follows: PP aggregates are put in a melt-blowing machine for preparation of PP fiber webs through melt-blowing; conductive particles are dispersed in a xylene solvent and subjected to ultrasonic oscillation, and a solution A is prepared; the PP fiber webs are placed in the solution A and subjected to the ultrasonic oscillation for 2-5 min, then the PP fiber webs are taken out, washed and naturally dried, and conductive fibers are obtained; the conductive fiber webs are divided into an upper layer and a lower layer and are laid on templates of a press device, a few PP aggregates are placed between the fiber webs and subjected to hot pressing in a vacuum press for 10-15 min, and the conductive PP thin film with higher comprehensive mechanical properties and the lower percolation threshold is obtained. The ultrafine PP fiber webs prepared with a melt-blowing technology have large specific surface area, surfaces of the fiber webs are uniformly modified with conductive filler with an ultrasonic dispersion method, a uniform conductive network structure is formed in the film after hot pressing, the technology is simple, and the prepared conductive thin film has both the higher mechanical properties and the lower percolation threshold.

Description

technical field

[0001] The invention belongs to the field of polymer material processing, and in particular relates to a simple preparation method of a PP conductive film with better mechanical properties and lower percolation value. Background technique

[0002] Carbon black, carbon nanotubes, graphene and other particles are commonly used fillers in the preparation of polymer conductive composites. How to improve the mechanical properties while improving the electrical conductivity, and how to use as low a conductive filler as possible to prepare materials with superior properties have attracted more and more interest in the field of conductive materials. However, the preparation of conductive composites often adopts the method of blending conductive fillers with the matrix. Not only is the operation cumbersome, the amount of conductive fillers is large, and the conductive particles are easy to agglomerate during blending, which seriously restricts the preparation of high-...

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