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 kind of Macromolecule Based Conductive Composite Material includes Macromolecule Based Material, conductive filler and coupling agent. Its' characteristics are as below:
(a) The mentioned Macromolecule Based Materials are one kind of and the mixture of polythene, polypropylene, PVDF, Polyolefin elastomer, epoxy resin, ethylene-vinyl acetate copolymer, polymethylmethacrylate and ethylene-acrylic acid copolymer. It accounts for 20%˜75% of volume fraction in the Macromolecule Based Conductive Composite Material. (b) Conductive filler with particles structure of core-shell type, which accounts for 25%˜80% of volume fraction of the Macromolecule Based Conductive Composite Material. Its' particle diameter is 0.1 um˜20 um, and volume resistivity is under 10−2 Ω·m. The mentioned conductive filler is dispersed in the Macromolecule Based material. (c) Coupling agent accounts for 0.05%˜5% of the volume of conductive filler. The mentioned coupling agent is one or more mixture of titanate coupling agent, single type alkoxy titanate coupling agent, single alkoxy pyrophosphate titanate coupling agent, chelate type titanate coupling agent, coordination type titanate coupling agent and quaternary ammonium salt type titanate coupling agent.