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PTC composite, its manufacturing method and obtained thermosensitive electronic material therefrom

A manufacturing method and technology of thermistors, applied to resistors with a positive temperature coefficient, conductive materials dispersed in non-conductive inorganic materials, resistors, etc., can solve problems such as low heat resistance and thermal shock resistance , to achieve the effect of excellent heat resistance and thermal shock resistance, high density

Inactive Publication Date: 2003-12-17
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when the density of the composition is high or the thickness of the molded article made of the composition during the radiation crosslinking treatment is thick, if the molded article is subjected to radiation crosslinking treatment, there is a problem of its heat resistance. The problem of low performance and thermal shock resistance

Method used

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  • PTC composite, its manufacturing method and obtained thermosensitive electronic material therefrom
  • PTC composite, its manufacturing method and obtained thermosensitive electronic material therefrom
  • PTC composite, its manufacturing method and obtained thermosensitive electronic material therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] 57% by volume of linear low-density polyethylene (melting point 122°C, specific gravity 0.93) produced using a metallocene catalyst as a polymer matrix, and 8% by volume of ethylene homopolymer (melting point 99°C) as a low-melting organic compound , mixed with 35% by volume of filiform nickel powder (average particle diameter 0.5-1.0 μm) having spike-shaped protrusions as a conductive substance, and then added 0.5% by weight of phenol-based and sulfur-based antioxidants relative to the total organic components Thereafter, it was kneaded in a mill for 30 minutes while heating at 150° C. to obtain a kneaded product (mixture).

[0091] The obtained kneaded product was sandwiched between Ni foils with a thickness of 25 μm, and the Ni foil was bonded to the kneaded product with a hot press set at 150° C. to obtain a molded product with a thickness of 300 μm including electrodes.

[0092] An electron beam having an acceleration voltage of 2000 kV was irradiated at a time wit...

Embodiment 2

[0105] Except that the irradiation amount of the electron beam is set to 100kGy, and this is divided into 5 times and irradiates 20kGy at a time, all the other are the same as in Example 1 to obtain a thermistor element sample, which is subjected to the same procedure as in Example 1. evaluate. The result of the various characteristics of embodiment 2 is shown in table 1, and R-T curve is as image 3 shown.

Embodiment 3

[0107] Except that the irradiation amount of the electron beam is set to 200kGy, and this is divided into 10 times and irradiates 20kGy each time, all the other are the same as in Example 1 to obtain a thermistor element sample, which is subjected to the same procedure as in Example 1. evaluate. The result of the various characteristics of embodiment 3 is shown in table 1, and R-T curve is as image 3 shown.

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Abstract

In a aspect of the present invention, a PTC composition contains (a) a crosslinked polymer matrix having a gel fraction of at least 10%, and (b) an electrically conductive substance containing a filamentary nickel powder having a spiky protrusion. An article shaped therefrom yields an electric resistance of at least 50 m OMEGA at 25 DEG C after being placed in an environment repeating 200 times of a temperature change between -40 DEG C and +85 DEG C, and exhibits no thermal deformation when placed on a hot plate at 200 DEG C for 5 minutes.

Description

technical field [0001] The present invention relates to a kind of PTC composition that is used as a temperature sensor or an overcurrent protection element and has a positive temperature coefficient (positive temperature coefficient of resistance, hereinafter referred to as PTC) characteristic that its resistance value increases as the temperature rises, its manufacturing method and The thermistor material thus obtained. Background technique [0002] It is known that a composition obtained by dispersing a conductive substance in a crystalline polymer matrix exhibits PTC properties (see US Pat. Nos. 3,243,753 and 3,351,882). In recent years, there has been a demand for a composition exhibiting this property (hereinafter referred to as a PTC composition accordingly) in order to be suitable for a lithium-ion battery represented by a mobile phone or a protective element of a general circuit. Therefore, the PTC composition needs to have high heat resistance and high stability. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/08H01C7/02H01C17/065
CPCH01C7/027C08K3/08H01C17/06586C08K2003/0862
Inventor 户坂久直山下保英繁田德彦小林一三
Owner TDK CORPARATION