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High-temperature resistant PTC electroconductive composition, high-temperature resistant PTC device containing composition and manufacturing method thereof

A technology of a conductive composition and a manufacturing method, applied in the direction of a current-responsive resistor, a resistor with a positive temperature coefficient, etc., can solve the problems such as resistance deviation from the initial value, low PTC strength, poor resistance energization cycle stability, etc. The effect of resistance value, high PTC strength, excellent resistance stability

Active Publication Date: 2009-10-21
SHANGHAI KETER POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such products generally have defects such as poor resistance cycle stability, that is, the resistance deviates greatly from the initial value after multiple actions, and the PTC strength is low when the initial resistance is low, which limits its use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 45wt% nylon 12 (Aesno-TL, melting point: 165-180°C, melting index: 0.3g / 10min, ElfAtochem Company), 50wt% carbon black Raven 430 (particle size 82nm, DBP value 78cm 3 / 100g, Columbian company), 4.5wt% magnesia (MgO) and 0.5wt% antioxidant 1010 (Irganox1010, Ciba Geigy company) are premixed and then added to the twin-screw extruder for melt blending, and the mixture melt is produced by The machine head directly enters the single-screw extruder, and then is pressed to a certain thickness of 0.3mm by a double-roller calender, and at the same time, nickel-plated copper foil electrodes are pasted on the upper and lower surfaces of the composition to obtain a PTC sheet. Place the PTC sheet in an oven at 200°C for 30 minutes, then turn off the power of the oven, and slowly cool down to room temperature. The heat-treated sheet is cross-linked with γ-rays, and the irradiation dose is 20 Mrads. Finally, punch the irradiated sheet into 8×12mm PTC chips. Measure its resistance at ...

Embodiment 2

[0035] A PTC device was fabricated in the same manner as described in Example 1, except that the nylon 12 (Aesno-TL) content was changed from 45 wt% to 41 wt%, and the carbon black Raven 430 content was changed from 50 wt% to 54 wt%. The physical properties of the PTC device were measured in the same manner as described in Example 1, and the results are listed in Table 2.

Embodiment 3

[0037] A PTC device was fabricated in the same manner as described in Example 1, but changing the content of nylon 12 (Aesno-TL) from 45 wt% to 37 wt%, and the content of carbon black Raven 430 from 50 wt% to 58 wt%. The physical properties of the PTC device were measured in the same manner as described in Example 1, and the results are listed in Table 2.

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Abstract

The invention relates to a high-temperature resistant PTC electroconductive composition, which comprises 20 to 70 percent of organic polymers, 25 to 75 percent of electroconductive filler, 1 to 30 percent of inorganic filler and 0.1 to 10 percent of additive, wherein the preferred melting point of the organic polymers is more than 150 DEG C; the organic polymers are one or more crystalline or semi-crystalline polymers and made of one or more of nylon 11, nylon 12, polyvinylidene fluoride, soluble poly(tetrafluoroethylene), ethylene-tetrafluoroethylene copolymers, perfluoroethylene-propylene, ethylene-chlorotrifluoroethylene and copolymers thereof. The invention also provides a high-temperature resistant PTC device containing the composition and a manufacturing method thereof. The high-temperature resistant PTC device containing the composition has low resistance, high PTC strength and superior resistance stability, so that the high-temperature resistant PTC device can be used for overcurrent protection of circuits in high-temperature environments such as automobile motors and the like. Moreover, the high-temperature resistant PTC device is simple and convenient to manufacture and has high efficiency.

Description

technical field [0001] The present invention relates to the technical field of conductive compositions, in particular to the technical field of positive temperature coefficient (Positive temperature coefficient, PTC) conductive compositions, in particular to a high temperature resistant PTC conductive composition, a high temperature resistant PTC device comprising the composition and its Manufacturing method. Background technique [0002] PTC (Positive temperature coefficient) materials are also called positive temperature coefficient materials. Before the critical transition temperature, the resistivity remains basically constant. After reaching the critical transition temperature, the resistivity suddenly increases and changes by several orders of magnitude. Since the resistance of this type of material has the PTC characteristic that increases with the increase of the ambient temperature, the current can be reduced or cut off at a higher temperature to achieve temperature...

Claims

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Application Information

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IPC IPC(8): C08L77/00C08L27/18C08L27/12C08L23/08C08K13/02H01C7/02H01C7/13
Inventor 李大军李波涛王俊刚金华玲汤先文史宇正
Owner SHANGHAI KETER POLYMER MATERIAL
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