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Polymer ptc device

A technology of PTC components and polymers, applied in the direction of electrical components, non-adjustable metal resistors, resistors, etc., can solve the problem of resistance change rate that is impossible to realize the display switch function

Inactive Publication Date: 2011-01-26
TYCO ELECTRONICS RAYCHEM BVBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, although some changes in resistance (usually several times to tens of times) caused by transition points such as glass transition temperature can be realized when PTC elements are prepared by using amorphous polymers such as thermosetting resins, it is still used as circuit protection components. , it is impossible to achieve the required resistance change rate of the display switch function (usually at least 1000 times)

Method used

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Examples

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Embodiment Construction

[0072] The present invention will be described in detail below through the examples. This example is only a solution of the present invention, and the present invention is not limited by these examples.

[0073] As explained below, a PTC element was fabricated using a nickel-cobalt alloy filler as a conductive filler, polyethylene as a polymer material, and nickel metal foil as a metal electrode.

[0074] (1) Preparation of conductive filler

[0075] Heat 1125ml of sodium hydroxide aqueous solution containing tartaric acid to 85°C while stirring, add 19.5g of nickel chloride aqueous solution converted to metal Ni, and then add 89.1g of hydrazine as a sufficient reducing agent to reduce and precipitate Ni metal powder .

[0076] Next, an aqueous solution of cobalt chloride containing 3.9 g as cobalt metal and an aqueous nickel chloride solution containing 15.6 g as nickel metal were prepared. These solutions are mixed, added to the aqueous solution containing Ni metal powde...

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Abstract

There is provided a polymer PTC device which has a further improved performance. Such PTC device comprises (A) a polymer PTC element containing (a1) an electrically conductive filler and (a2) a polymer material, and (B) at least one metal electrode disposed on at least one surface of the polymer PTC element, and the electrically conductive filler is an Ni alloy filler which has oxidation resistance under a high temperature and dry atmosphere, and the polymer material is a thermoplastic crystalline polymer.

Description

technical field [0001] The present invention relates to a polymer PTC element containing Ni alloy filler (such as nickel-cobalt alloy granular or powder) having oxidation resistance under high-temperature dry conditions as a conductive filler, especially an element that can be used as a circuit protection device, And an electrical device assembled with the above elements. Background technique [0002] PTC (Positive Temperature Coefficient) elements are used, for example, as circuit protection elements for protecting circuits, in electrical devices such as various electrical and electronic instruments. The resistance of the PTC element changes with temperature. Generally, when the temperature of a PTC element rises from room temperature and exceeds a specific threshold temperature called an operating temperature, the resistance of the PTC element has a property of rapidly increasing. In this way, the property that the resistance increases, preferably sharply, as the tempera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/02
CPCH01C7/027H01C7/02
Inventor 田中新野村圭一郎
Owner TYCO ELECTRONICS RAYCHEM BVBA
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