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Preparation method of NTC (Negative Temperature Coefficient) nickel-based thermistor material

A thermistor, nickel-based technology, applied in the field of preparation of NTC nickel-based thermistor materials, can solve the problems of low volatilization temperature, inconsistent batches, volatilization of raw material components, etc., to achieve high temperature resistance and high pressure resistance, components uniform effect

Active Publication Date: 2018-11-23
JURONG BOYUAN ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In normal temperature NTC thermistors, spinel NTC thermistor elements made of oxides of transition metals manganese, nickel, cobalt, iron, and copper are mainly used, but due to the low volatilization temperature of these transition metal oxides, During the preparation and sintering process of this kind of NTC thermistor element, the volatilization of raw material components is easy to occur, causing the problem of inconsistency between batches

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] S1: According to the molecular formula (Ni 0.97 Zn 0.03 ) 0.998 Fe 0.002 O for batching, take basic nickel carbonate, iron oxide and zinc acetate, basic nickel carbonate and iron oxide are dissolved in dilute nitric acid, add ammonia water to adjust the pH value to be about 8, zinc acetate is dissolved in deionized water, and then the two solutions Mix and mix evenly in a magnetic stirrer, heat and dry to obtain powder, then calcinate at 720°C for 2.5h, then raise the temperature to 960°C at 15°C / min and keep it for 1.5h, take out and quench to obtain nickel-based resistance powder;

[0018] S2: Mix polyvinylidene fluoride and maleic anhydride at a mass ratio of 1:1, add dibutyltin lauryl and hydrogen peroxide in sequence at an oil bath temperature of about 100°C, and stir for 3 to 5 hours to obtain maleic anhydride grafted polyvinylidene fluoride Ethylene: Mix the obtained maleic anhydride grafted polyvinylidene fluoride and polyphenylene sulfide in a weight ratio o...

Embodiment 2

[0022] S1: According to the molecular formula (Ni 0.99 Zn 0.01 ) 0.995 Fe 0.005 O for batching, take basic nickel carbonate, iron oxide and zinc acetate, basic nickel carbonate and iron oxide are dissolved in dilute nitric acid, add ammonia water to adjust the pH value to be about 8, zinc acetate is dissolved in deionized water, and then the two solutions Mix and mix evenly in a magnetic stirrer, heat and dry to obtain a powder, then calcinate at 650°C for 3 hours, then raise the temperature to 930°C at 10°C / min for 2 hours, take out and quench to obtain a nickel-based resistance powder;

[0023] S2: Mix polyvinylidene fluoride and maleic anhydride at a mass ratio of 1:0.8, add dibutyltin lauryl and hydrogen peroxide in sequence at an oil bath temperature of about 100°C, and stir for 3 to 5 hours to obtain maleic anhydride grafted polyvinylidene fluoride Ethylene: Mix the obtained maleic anhydride grafted polyvinylidene fluoride and polyphenylene sulfide at a weight ratio o...

Embodiment 3

[0027] S1: According to the molecular formula (Ni 0.96 Zn 0.04 ) 0.999 Fe 0.001 O for batching, take basic nickel carbonate, iron oxide and zinc acetate, basic nickel carbonate and iron oxide are dissolved in dilute nitric acid, add ammonia water to adjust the pH value to be about 8, zinc acetate is dissolved in deionized water, and then the two solutions Mix and mix evenly in a magnetic stirrer, heat and dry to obtain powder, then calcinate at 760°C for 2 hours, then raise the temperature to 980°C at 20°C / min for 1 hour, take out and quench to obtain nickel-based resistance powder;

[0028] S2: Mix polyvinylidene fluoride and maleic anhydride at a mass ratio of 1:1.2, add dibutyltin lauryl and hydrogen peroxide in sequence at an oil bath temperature of about 100°C, and stir for 3 to 5 hours to obtain maleic anhydride grafted polyvinylidene fluoride Ethylene: Mix the obtained maleic anhydride grafted polyvinylidene fluoride and polyphenylene sulfide at a weight ratio of 1 t...

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PUM

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Abstract

The invention discloses a preparation method of an NTC (Negative Temperature Coefficient) nickel-based thermistor material. The preparation method comprises the following steps: preparing materials according to a molecular formula (Ni1-xZnx)1-yFeyO, wherein x is greater than or equal to 0.01 and less than or equal to 0.04 and y is greater than or equal to 0.001 and less than or equal to 0.005; calcining by sections to obtain nickel-based resistor powder; then mixing the nickel-based resistor powder with conductive filler prepared by compounding maleic anhydride grafted polyvinylidene fluorideand polyphenylene sulfide; extruding and granulating through a double-screw extruder; carrying out mold pressing and forming to prepare the nickel-based thermistor material. According to the preparation method disclosed by the invention, the nickel-based resistor material is prepared by adopting sectioned calcining for the first time; the first section is carried out at 650 to 760 DEG C and the second section is carried out at 930 to 980 DEG C; the problem that transition metal including nickel, iron and the like is easy to volatilize through one-time high-temperature calcining is avoided; a high molecular polymer is prepared by compounding the maleic anhydride grafted polyvinylidene fluoride and the polyphenylene sulfide and the high-temperature-resisting conductive filler is prepared; the nickel-based thermistor material prepared by compounding the high molecular polymer and the high-temperature-resisting conductive filler has uniform components and has relatively high high-temperature-resisting and high-voltage-resisting capabilities.

Description

technical field [0001] The invention relates to a preparation method of an NTC nickel-based thermistor material, belonging to the field of resistance material preparation. Background technique [0002] Thermistor is a kind of sensitive element that is sensitive to temperature and exhibits different resistance values ​​at different temperatures. According to different temperature coefficients, it is divided into positive temperature coefficient thermistor (PTC) and negative temperature coefficient thermistor. (NTC). Among them, the negative temperature coefficient thermistor (NTC) is a kind of semiconductor material whose resistance value decreases with the increase of temperature. It has the functions of temperature measurement, temperature control, temperature compensation, and surge suppression. In normal temperature NTC thermistors, spinel NTC thermistor elements made of oxides of transition metals manganese, nickel, cobalt, iron, and copper are mainly used, but due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/10H01C7/04
CPCC04B26/10C04B2111/00844H01C7/04C04B24/166C04B22/14C04B14/024C04B14/386C04B14/34C04B14/28C04B14/06C04B24/42C04B24/026C04B22/06C04B24/12C04B24/10C04B24/16
Inventor 汤成平
Owner JURONG BOYUAN ELECTRONICS
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