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

Inactive Publication Date: 2008-12-31
FSPG HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the combination of electrodes by electroplating, the investment in equipment is large and the process is more complicated, and often because the metal electrode and the polymer matrix are not tightly combined, the resistance value of the thermistor at room temperature is increased, and it is difficult to ensure the uniformity of the metal coating. The resistance value is usually between 1-10Ω, which is difficult to meet the requirements of the mΩ level of thermistor

Method used

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  • Polymer PTC heat sensitive material obtained by compound extruding method
  • Polymer PTC heat sensitive material obtained by compound extruding method

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Add the masterbatch prepared by the formula in Table 1 and the conventional method into the compound group of the extruder, and the equipment used is such as figure 1 shown. The masterbatch is extruded by a twin-screw extruder in a molten state (melting processing temperature is 200-240°C), and reaches the extrusion die through a connecting pipe (the temperature at the die is 190-230°C). The molten resin is compounded with two layers of aluminum foil on the left and right by twin-roll extrusion, and a film with a thickness of 50 μm and a width of 1.5 m is obtained through a quenching roll at 30-40 ° C. The heat-sensitive film is then subjected to gamma rays (Co 60 ) irradiation with a dose of 50-80Mrad, the polymer PTC thermosensitive film of the present invention is obtained.

Embodiment 2

[0042] The raw materials in Table 1 are mixed by an internal mixer and then directly extruded through a single-screw or twin-screw extruder to form a molten state (melting processing temperature is 200-240 ° C), and reach the extrusion die through the connecting pipe (die head temperature at 190-230°C), the molten resin is compounded with two layers of copper foil on the left and right by twin-roll extrusion at the die head, and after a quenching roll at 80-100°C, a film with a thickness of 50 μm and a width of 1.5 m is obtained. film. Then, the heat-sensitive film is irradiated with electron beams, and the dose is 50-80 Mrad, so as to obtain the polymer PTC heat-sensitive film of the present invention.

Embodiment 3

[0044] Add the masterbatch prepared in Table 1 into the compounding group of the extruder. The masterbatch is extruded through a single-screw or twin-screw extruder in a molten state (melting processing temperature is 200-240°C), and the connecting pipe reaches At the extrusion die head (the temperature at the die head is 190-230°C), the molten resin is compounded with two layers of aluminum foil on the left and right by double-roller extrusion at the die head, and the thickness is obtained by quenching the roll at 80-100°C. 100μm thin film with a width of 1.0m. The heat-sensitive film is then subjected to gamma rays (Co 60 ) irradiation with a dose of 50-80Mrad, the polymer PTC thermosensitive film of the present invention is obtained.

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02B32B37/02B32B15/08C08J3/24
Inventor 蔡朝辉吴耀根沈勇蔡敏杰
Owner FSPG HI TECH
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