Polymer PTC heat sensitive material obtained by compound extruding method

A heat-sensitive material and polymer technology, applied in the field of polymer PTC heat-sensitive materials, can solve the problems such as the metal electrode and the polymer matrix are not tightly combined, it is difficult to meet the requirements of the thermistor, and it is difficult to ensure the uniformity of the metal coating. To achieve the effect of avoiding the possibility of environmental pollutants, low cost and large production capacity
CN101335124AInactive Publication Date: 2008-12-31FSPG HI TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FSPG HI TECH
Publication Date
2008-12-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for preparing macromolecule PTC heat sensitive material by utilizing an extrusion laminating method, which comprises the following steps: (1) master batch of the PTC heat sensitive material is prepared as a matter of routine; (2) by adopting the extrusion laminating method, the master batch obtained in step (1) is laminated with metal foil at an extrusion die head by molten resin; (3) the composite membrane obtained in step (2) is cooled on a quenching roller and then wrapped up and parted off to form a semi-manufactured membrane; (4) the composite membrane obtained in step (3) is crosslinked by irradiation. The macromolecule PTC heat sensitive material, prepared by adopting the extrusion laminating method of the invention, is applicable to mechanized production and has low cost and high efficiency. The prepared macromolecule PTC heat sensitive material increases the composite forces of metal electrodes and macromolecule matrixes and can be wrapped up. Furthermore, products can be produced into small ones.
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Description

technical field

[0001] The invention relates to a polymer PTC thermosensitive material, its preparation method and its application. Background technique

[0002] As we all know, adding conductivity factors to crystalline or semi-crystalline polymers can exhibit positive temperature coefficient (Positive Temperature Coefficient or PTC) characteristics: the resistivity can increase rapidly with the rise of temperature in a relatively short temperature range , because the polymer PTC thermistor has a low initial resistance, and it increases rapidly by nearly 5 orders of magnitude in a relatively fast time, which can effectively prevent the circuit from malfunctioning, such as short circuit, lap, induction, etc. Avoid damage to other important components in the circuit caused by large currents in the circuit. When the circuit fault is eliminated, the temperature of the thermistor drops, and its resistance value returns to a low resistance state, which does not need to be replac...

Claims

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