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Positive temperature coefficient material and thermistor containing the material and preparation method therefore

A technology of positive temperature coefficient and content, applied in the field of thermistors and their preparation, can solve the problems of poor stability of PTC strength at room temperature, and achieve good stability, good room temperature resistance stability, and good PTC strength stability. Effect

Active Publication Date: 2009-06-24
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the defects of poor room temperature resistance stability and PTC strength stability of the resistance of the positive temperature coefficient thermistor prepared by the positive temperature coefficient material prepared by the prior art after repeated use, and to provide a Thermistor with good room temperature resistance stability and PTC strength stability after repeated use, positive temperature coefficient material and their preparation method

Method used

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  • Positive temperature coefficient material and thermistor containing the material and preparation method therefore

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preparation example Construction

[0027] The preparation method of the thermistor provided by the present invention includes heating and melting the mixture containing resin, conductive filler, non-conductive filler, auxiliary agent, crosslinking agent and additive, and then extruding the obtained melt into granules, wherein the additive One or more selected from silicon dichloride, sodium fluoride and carbon tetrachloride.

[0028] According to the method of the present invention, based on the total weight of the mixture, the amount of each substance is such that the content of the resin in the mixture is 10-60% by weight, preferably 10-50% by weight; the content of the conductive filler is 30-80% by weight %, preferably 35-75% by weight; the content of non-conductive filler is 1-15% by weight, preferably 1-10% by weight; the content of auxiliary agent is 1-10% by weight, preferably 1-8% by weight; The total content of linking agent and additive is 1-10% by weight, preferably 1-8% by weight; wherein, the weig...

Embodiment 1

[0044] This embodiment is used to illustrate the preparation of the positive temperature coefficient material and thermistor of the present invention.

[0045] 14 parts by weight of high-density polyethylene (density 0.950 g / cm 3 , melting point 132°C, weight average molecular weight 200,000), 75 parts by weight of nickel powder, 5 parts by weight of silicon dioxide, 2 parts by weight of antioxidant 1010, 2 parts by weight of KT114 type titanate coupling agent and 1 part by weight of crosslinking agent The agent tetraethylene glycol dimethacrylate and 1 part by weight of the additive silicon dichloride are added to the high mixer, mixed at room temperature (25 ° C), first stirred at 800 rpm for 10 minutes, and then in the Stir at 2000 rpm for 3 minutes to obtain a mixture.

[0046] The mixture obtained above was sent into a twin-screw compounding extruder (SJSH-30 type, Nanjing Rubber and Plastic Machinery Factory), the length-to-diameter ratio of the extruder was L:D=36:1, a...

Embodiment 2

[0050] This embodiment is used to illustrate the preparation of the positive temperature coefficient material and thermistor of the present invention.

[0051] 25 parts by weight of high-density polyethylene (density 0.950 g / cm 3 , melting point 132°C, weight average molecular weight 200,000), 50 parts by weight of nickel powder and 10 parts by weight of carbon black, 6 parts by weight of magnesium oxide, 2 parts by weight of antioxidant 1010, 1 part by weight of KT114 type titanate coupling agent and Add 2 parts by weight of the crosslinking agent tetraethylene glycol dimethacrylate and 4 parts by weight of the additive sodium fluoride into the high mixer, mix at room temperature (25°C), and first stir at 800 rpm for 10 minutes , and then stirred at a speed of 2000 rpm for 5 minutes to obtain a mixture.

[0052] The mixture obtained above was fed into a twin-screw compounding extruder (SJSH-30 type, Nanjing Rubber and Plastic Machinery Factory), and the mixture was melt-extr...

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Abstract

Disclosed are a positive temperature coefficient material, a preparation method thereof, a positive temperature coefficient thermistor including the positive temperature coefficient material and a preparation method thereof. The material is a product formed by a mixture through melting; the mixture comprises resin, conductive filling, non-conductive filling, promoter and cross-linking agent, wherein, the mixture also comprises additives; and the additives are selected from silicon dichloride, sodium fluoride and carbon tetrachloride. The positive temperature coefficient material is provided with good stability and the output power of the positive temperature coefficient material is slowly attenuated along with the increase of the switching movement times, so that the thermistor prepared with the positive temperature coefficient material is provided with good room temperature resistance stability and PTC intensity stability after the thermistor is frequently used.

Description

technical field [0001] The present invention relates to a material, a resistance containing the material and their preparation method, in particular, a positive temperature coefficient material, a thermistor containing the material and their preparation method. Background technique [0002] Some polymer conductive composite materials have a positive temperature coefficient (PTC) effect, that is, the resistivity of the material increases with the increase of temperature, and the resistivity shows a sudden change of magnitude near the critical temperature. The application of polymer positive temperature coefficient materials has received more and more attention, but the stability of the materials needs to be further improved. The main problems that limit the application of positive temperature coefficient materials are: (1) the room temperature resistivity of positive temperature coefficient materials is unstable, and the resistivity of thermistors made of this material change...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02
Inventor 刘占果周勇董俊卿
Owner BYD CO LTD
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