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Method for manufacturing high-temp PTC thermosensitive resistor

A technology of thermistor and manufacturing method, applied in the direction of resistors with positive temperature coefficient, etc., can solve the problems of affecting the normal operation of electrical equipment, inconsistent resistance changes, wide distribution of resistance at room temperature, etc., to eliminate NTC phenomenon, resistance changes, etc. The effect of uniform rate and room temperature resistance

Active Publication Date: 2008-10-15
SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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Problems solved by technology

Most of the polymer PTC thermistors produced by existing raw materials and manufacturing methods have the disadvantages of low transition temperature, wide distribution of room temperature resistance, inconsistent resistance changes during use, and prominent NTC phenomenon at high temperatures. Normal operation of electrical equipment

Method used

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Embodiment Construction

[0008] Polyvinylidene fluoride, carbon black, magnesium hydroxide, anti-aging agent, and coupling agent are melted and mixed into a core material through an internal mixer and an open mill, and the metal electrode sheets are compounded on both sides of the core material by a press, and then punched Punched into chips with a size of 10×14mm, first place them in an oven at 180°C for 45 minutes, then slowly cool them to room temperature, take them out and place them for 24 hours, and then irradiate them with electron beams for 150KGy, and then place them at 180 ℃ oven for 45 minutes, then slowly cooled to room temperature, placed for 24 hours and cross-linked with electron beam irradiation, irradiation dose 170KGy. Measure its room temperature resistance value, the average resistance value R of the sample resistance 0 29mΩ, the resistance value is 27mΩ~31mΩ(R 0 The percentage (yield rate) of samples within the range of ±2mΩ) is 95%. Take 10 samples, shock 1000 times with 42V, 10...

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Abstract

A manufacturing method of high temperature macromolecule PTC thermal resistor relates to manufacturing method of the electronic component whose material mainly is crystalline hypo-crystalline high polymer and its mixture. A manufacturing method of high temperature PTC thermal resistor is that after the chip is forming, the chip is set in the heating equipment whose high polymer melting point is more than from five centigrade degree to thirty centigrade degree for from five minutes to fifty minutes, then slowly cooled to room temperature, later irradiated, and irradiation dosage range is 0.2- 0.7 times of which is from 20KGy to 5000KGy; after the irradiation , the chip is again set in the heating equipment whose high polymer melting point is more than from five centigrade degree to thirty centigrade degree for from five minutes to fifty minutes, then slowly cooled to room temperature, do the second irradiation, and the irradiation dosage range is 0.4- 0.8 times which is from 20KGy to 5000KGy.

Description

technical field [0001] The invention discloses a method for manufacturing a high-temperature PTC thermistor, and relates to a method for manufacturing electronic components with crystal, semi-crystalline high polymers and blends thereof as main raw materials. Background technique [0002] Polymer PTC thermistors are widely used in many fields such as communications, computers, automobiles, industrial controls, and household appliances. Most of the polymer PTC thermistors produced by existing raw materials and manufacturing methods have the disadvantages of low transition temperature, wide distribution of room temperature resistance, inconsistent resistance changes during use, and prominent NTC phenomenon at high temperatures. normal operation of electrical equipment. In order to overcome the defects in the above-mentioned technologies, the present invention proposes a new technical solution. Contents of the invention [0003] The purpose of the present invention is to pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/02
Inventor 刘峰侯李明王军王勇
Owner SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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