Composite material and macromolecule positive temperature coefficient thermistor made of composite material

Abstract

The invention discloses a composite material and a macromolecule positive temperature coefficient thermistor prepared from the composite material. The composite material comprises a macromolecule crystalline polymer, a conductive filler and a compatilizer, wherein the macromolecule crystalline polymer accounts for 5-15 wt% of the composite material, the conductive filler accounts for 70-95 wt% ofthe composite material, the compatilizer accounts for 0.5-2 wt% of the composite material, the conductive filler is a mixture of a carbide and metal tungsten, the metal tungsten accounts for 2-6 wt% of the weight of the conductive filler, the compatilizer is an ethylene-vinyl alcohol copolymer, the thermistor comprises two conductive layers and a composite material layer, the composite material layer is arranged between the two conductive layers, the composite material layer is made of a composite material, and the thermistor has the characteristic of low initial resistance and can still keepthe characteristic of low resistance after multiple high-low temperature cycles so as to meet lithium battery stability.

Description

technical field [0001] The invention relates to a composite material used in electronic components and a polymer positive temperature coefficient thermistor made of the composite material. Background technique [0002] The polymer positive temperature coefficient thermistor can maintain an extremely low resistance value at normal temperature, and has the characteristic of being sensitive to temperature changes, that is, when an overcurrent or overtemperature occurs in the circuit, its resistance will instantly increase to one High resistance value keeps the circuit in an open circuit state to achieve the purpose of protecting circuit components. Therefore, conductive composite materials with a positive temperature coefficient of resistance can be connected to the circuit. As materials for current sensing components, such conductive composite materials have been widely used in electronic circuit protection components. [0003] However, with the popularization of electric loc...

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Problems solved by technology

[0005] In order to make the polymer positive temperature coefficient thermistor have excellent resistance reproducibility after repeated high and low temperature cycles, the prior art uses a coupling agent or maleic anhydride grafted polyethylene to increase the polymer and The interface binding property of conductive particles, however, if a coupling agent is used, there will be a problem of precipitation of the coupling agent during use

If maleic anhydride-grafted polyethylene is used, because the grafting rate of maleic anhydride-grafted polyethylene is low, generally only 0.4% to 2%, so in order to achieve the purpose, grafted polymers such as maleic anhydride are required. A large amount will affect the resistance value

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