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Positive temperature coefficient composite material and thermistor

A positive temperature coefficient, composite material technology, applied in the direction of resistors with positive temperature coefficient, etc., can solve the problems of high cost and complicated process

Active Publication Date: 2013-07-17
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the technical problems of the negative temperature resistance effect existing in the use process of the existing positive temperature coefficient composite material or the complex process and high cost of preparing the positive temperature coefficient composite material without the negative temperature resistance effect, and to provide a simple and easy-to-use material. A low-cost positive temperature coefficient composite material without negative temperature resistance effect

Method used

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  • Positive temperature coefficient composite material and thermistor
  • Positive temperature coefficient composite material and thermistor
  • Positive temperature coefficient composite material and thermistor

Examples

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Effect test

preparation example Construction

[0025] The preparation method of the positive temperature coefficient thermistor includes placing the positive temperature coefficient composite material in a hot press, covering the upper and lower sides with a conductive matrix, and performing hot pressing at a temperature of 160-180 ° C to form a three-layer composite core. The positive temperature coefficient composite material put into the hot press can be mixed powder or formed material. Then, the lead-out electrodes are respectively connected on the two conductive substrates, and the connection can be made by solder paste welding. Except that the PTC composite material is the PTC composite material provided by the present invention, the preparation method of the thermistor and the Conditions are known to those skilled in the art.

[0026] Preferably, the method further includes forming an epoxy resin film layer on the surface of the thermistor to prevent the thermistor from being oxidized. The method for forming an epox...

Embodiment 1

[0029](1) Take 750g of indium-tin alloy particles (the average particle size is 10μm, the indium content is 40 wt%, and the melting range is 140°C), add it to the isopropanol solution containing 1g of titanate, and put it in a high-mixer Mix and stir for 0.5 hours, take it out, dry it at room temperature, and dry it in a vacuum oven at 120°C for 1 hour to prepare granule A;

[0030] (2) Take 210g of high-density polyethylene particles (Tm is 130°C), 2g of magnesium hydroxide, 1g of stearic acid and the above-prepared particles A and put them in a planetary ball mill at a speed of 150r / min for 12 hours to obtain positive Mixed powder of temperature coefficient composite material;

[0031] (3) Put the mixed powder obtained above in a hot press, cover the top and bottom with a piece of nickel-plated copper foil and perform hot-press molding at a temperature of 160°C, and punch the material into small pieces of 3*3mm, Use solder paste to weld the lead-out electrode sheets on the ...

Embodiment 2

[0033] The mixed powder of the positive temperature coefficient composite material and the positive temperature coefficient thermistor were prepared by the same method as in Example 1. The difference is that the mass of indium-tin alloy is 690g, and that of polyethylene is 270g.

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Abstract

The invention provides a positive temperature coefficient composite material and a thermistor. The composite material is a product obtained by mixture mixing, wherein the mixture comprises a polymer and indium-tin alloy. Based on the total amount of the mixture, the mass percentage content of the indium-tin alloy is 60-90%. Under room temperature, the material has excellent electrical conductivity and excellent PTC effect performance. The material is simple and is easy to obtain. No subsequent step such as radiation crosslinking is needed. The process is simple, and the cost is low. The prepared thermistor has no NTC effect and can be widely applied in practical applications.

Description

technical field [0001] The invention relates to a positive temperature coefficient composite material and a thermistor. Background technique [0002] Positive temperature coefficient (PTC) polymer composite materials are widely used in computers and their peripheral equipment, mobile phones, battery packs, telecommunication and network equipment, transformers, industrial control equipment, automobiles and other electronic products, which can cause overcurrent or overcurrent. The role of thermal protection. PTC composites mainly contain polymers and conductive particles, which are characterized in that the resistivity of the material increases sharply with the increase of temperature in a narrow temperature range (near the glass transition temperature of the polymer). The temperature near the temperature can suddenly increase by several or even a dozen orders of magnitude. With the help of this relationship between the resistivity and the temperature, the positive temperatur...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08K3/08H01C7/02
Inventor 刘倩倩刘子岳陈炎
Owner BYD CO LTD