Macromolecule-based conductive composite material and PTC element

摘要

A macromolecule-based conductive composite material and a PTC element. The macromolecule-based conductive composite material comprises: a macromolecule base material, having a volume fraction of the macromolecule base material of 20%-75%; a conductive filler with a core-shell granule structure and dispersed in the macromolecule base material, having a volume fraction of 25%-80%; and a coupling agent, being a titanate coupling agent and accounting for 0%-5% of the volume of the conductive filler. The PTC element prepared by using the macromolecule-based conductive composite material comprises at least two metal electrode plates (12, 12′), a macromolecule-based conductive composite material (11) being closely combined with the metal electrode plates (12, 12′). The PTC element prepared from the macromolecule-based conductive composite material has the advantages of low room-temperature resistivity, outstanding weather durability, good voltage resistance and good resistor repeatability.

主权项

1. A conductive composite material, comprising:
a polymer bases material; and a conductive filler, wherein the polymer base material is selected from the group consisting of polyethylene, polypropylene, polyvinylidene difluoride, polyolefin elastomer, epoxy resin, ethylene-vinyl acetate copolymer, polymethylmethacrylate, ethylene-acrylic acid copolymer and a mixture thereof, the conductive filler comprises core-shell particles having a core made of a core material and a shell made of a shell material different from the core material wherein the polymer base material account for 20%˜70% of volume fraction in the conductive composite material; and the conductive filler accounts for 25%˜80% of volume fraction of the conductive composite material; and the core material is selected from the group comprising of tantalum, zirconium, titanium, niobium, molybdenum, hafnium, tungsten, chromium and beryllium, and the shell material is selected from boride, nitride, carbide or silicide of the core material.