Thermistor

一种热敏电阻、热敏电阻元件的技术，应用在电阻器、不可调金属电阻器、电路等方向，能够解决室温电阻值低、室温电阻值升高等问题

Inactive Publication Date: 2006-07-12
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, conventional organic thermistors do not necessarily have sufficiently low room temperature resistance, and further improvement is required from this point of view.
In addition, conventional organic thermistors undergo a thermal process in a reflow process or the like in order to be mounted on a substrate, and there is a problem that the resistance value at room temperature is significantly higher than that before the thermal process.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0065]

[0066] Mix epoxy resin "Adeka Resin EP-4005" (trade name, manufactured by Asahi Denka Co., Ltd.) and anhydride-based curing agent "Epoxy Resin B-570" (trade name, manufactured by Dainippon Ink Chemical Co., Ltd.), and add Conductive particle nickel particles (manufactured by Nikko Rika Co., Ltd.), so that the content of nickel particles is 75% of the curable resin composition as a whole, using a homogenizer "Selmaster one" (trade name, manufactured by Asswan Co., Ltd.), with a rotation speed of 5000rpm This was kneaded for 50 minutes to obtain a curable resin composition for forming a thermistor element layer.

[0067]

[0068] A part of the obtained curable resin composition was taken out, the resin component was removed by dissolving in acetone, and a Ni particle sample for particle diameter measurement was taken out. Using a micro-trajectory particle size distribution analyzer ("9320HRA (X-100)", trade name, manufactured by Nikkiso Co., Ltd.), the particle diam...

Embodiment 2、3 and comparative example 1、2

[0074] Except that the number of revolutions of the homogenizer when preparing the curable resin composition is the number of revolutions shown in Table 1, the others are the same as in Example 1, prepare the curable resin composition, measure the particle diameter of the Ni particles, make a thermistor and Make an evaluation. However, in Comparative Example 1, due to insufficient kneading, the curable resin composition could not be molded into a sheet shape, and a thermistor could not be produced either. Table 1 shows the particle size of the Ni particles and the room temperature resistance value of the thermistor.

reference example 1

[0076] The ratio of Ni in the curable resin composition was taken as 60% by mass, and when the curable resin composition was prepared, a stirrer ("Turned" (trade name) manufactured by AZWON Co., Ltd.) having a stirring blade was used instead of a homogenizer. Except stirring at 180 rpm for 45 minutes, a curable resin composition was prepared in the same manner as in Example 1, the particle diameter of Ni particles was measured, and a thermistor was fabricated and evaluated. Table 1 shows the particle size of the Ni particles together with the room temperature resistance value of the thermistor.

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PUM

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Abstract

A thermistor is provided with a pair of opposed electrodes, and a thermistor body layer disposed between the pair of electrodes(2,3) and including a cured body of a curable resin composition containing a thermosetting resin and conductive particles(1), and an average particle diameter of secondary particles of the conductive particles is in a range of 3.8 to 17.0 mum.

Description

technical field [0001] The present invention relates to a thermistor using an organic-based material as a thermistor element. Background technique [0002] A thermistor that uses a material composed of a polymer layer and conductive particles dispersed in the layer as a thermistor element is generally called an organic thermistor, especially a PTC that has a sharp increase in resistance value as the temperature rises ( Positive Temperature Coefficient: A thermistor with positive temperature coefficient) characteristics, sometimes called an organic positive characteristic thermistor. Such thermistors can be used in devices such as overcurrent and heating protection elements, self-control heating elements, and temperature sensors. [0003] As an organic thermistor, for example, there is a proposal to use, as a thermistor element, a material obtained by dispersing conductive particles in epoxy resin, which is a thermosetting resin (Patent Document 1). [0004] However, conven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02
CPCH01C7/027
Inventor 白井智士森由纪江
Owner TDK CORPARATION
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