Low-percolation-threshold polypropylene-based composite electroconductive high polymer material and preparation method thereof

Abstract

The invention discloses a low-percolation-threshold polypropylene-based composite electroconductive high polymer material which is composed of, by weight, 40-50 parts of polypropylene, 1-2 parts of carbon nano tube, 20-30 parts of electroconductive carbon black, 5-12 parts of glass fiber, 5-10 parts of titanium-magnesium alloy, 5-8 parts of calcium powder, 5-10 parts of decabromodiphenyl ether and 1-2 parts of silicone oil.The invention further discloses a preparation method of the material.The silicone oil is adopted as a phase solvent, so that dispersity of the electroconductive carbon black in polypropylene is improved, percolation value of the composite material is lowered, and electroconductivity of the material is improved greatly; various fillers are compounded and added, overall mechanical performance of the material is improved, and the material has better properties.

Description

Technical field: [0001] The invention relates to the field of materials, in particular to a polypropylene-based composite conductive polymer material with a low percolation threshold. Background technique: [0002] Polypropylene-based composite conductive polymer material refers to a composite material with certain conductivity and good mechanical properties that is obtained by using general-purpose polymer polypropylene as a matrix, adding various conductive substances, and compounding through physical and chemical methods. A conductive material with the widest application and the largest amount, among which the dispersed composite conductive polymer material is usually filled with conductive particles or conductive fibers, such as carbon black, carbon fiber, metal powder, metal fiber, metallized glass fiber, etc., among which carbon black is Currently the most widely used conductive filler with the largest amount, its volume resistivity is 0.1~10Ω·cm, the conductivity is s...

AI Technical Summary

Problems solved by technology

However, the addition of carbon black to the polymer matrix has a significant impact on the mechanical properties and processing properties of the material, and it was found during the preparation process that the conductive carbon black has poor dispersion in polypropylene, resulting in a relatively low percolation value of the composite material. high

Therefore, the single use of conductive carbon black as a conductive filler cannot meet the requirements, and the preparation of composite materials with multiple fillers has become the focus of research.