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Base materials of PTC (Positive Temperature Coefficient) thermistor, PTC thermistor and preparation method thereof

A thermistor and substrate technology, applied in the direction of resistors with positive temperature coefficient, etc., can solve the problems of personnel and environmental damage, PTC components can not work normally, etc., to achieve the effect of a wide range of applications

Inactive Publication Date: 2011-09-07
深圳市长园维安电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the fact that the existing PTC elements cannot work normally in high temperature environment, and the toxic and harmful gases that may be produced during the processing and application of the current high temperature PTC elements with PVDF as the carrier are harmful to personnel and Defects caused by the environment, providing a PTC thermistor that can withstand high temperatures, is non-toxic and harmless, has high PTC strength, and has excellent resistance stability and its preparation method

Method used

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  • Base materials of PTC (Positive Temperature Coefficient) thermistor, PTC thermistor and preparation method thereof
  • Base materials of PTC (Positive Temperature Coefficient) thermistor, PTC thermistor and preparation method thereof
  • Base materials of PTC (Positive Temperature Coefficient) thermistor, PTC thermistor and preparation method thereof

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preparation example Construction

[0039] Prepare the preparation method of the base material of PTC thermistor of the present invention, comprise the following steps:

[0040] Step 1: According to the relative weight ratio, mix 80-150 parts of conductive particles, 20-100 parts of inert filler, 0.5-3 parts of crosslinking agent, 0-1 part of nucleating agent, 0.5-5 parts of sensitizer, antioxidant 0.5~3 parts, 0.5~2 parts of lubricant, 0~2 parts of coupling agent, after weighing, pre-mix first;

[0041] Step 2: Control the temperature of the double rolls of the double roll mill at 190-290°C, then add 100 parts of polyamide resin between the two rolls to melt the resin completely, and then disperse the premixed material in step 1 evenly , put it into the roller of the double-roller mill, make it fully mixed with the molten polyamide resin, and continuously turn over the material to achieve the purpose of fully melting and mixing. The thickness is 0.9-1.2mm, after cooling, it is cut into 80×225 mm sheet, which i...

Embodiment 1

[0051] Weigh 100 g of polyamide resin PA12 (Switzerland EMS company, melting point 178 ° C, density 1.01 g / cm2), antioxidant 2 g by tetrakis [methyl-β- (3,5-di-tert-butyl-4-hydroxybenzene base) propionate] pentaerythritol ester (1010) 1.5g and auxiliary antioxidant dilauryl thiodipropionate (DLTP) 0.5g, combined at a fixed ratio of 3:1, the crosslinking agent is bismaleic Imide (BMI) 1.0 g, coupling agent is silane coupling agent vinyltriethoxysilane (A151) 1.0 g, lubricant is stearic acid (Hst), the addition amount is 2.0 g, sensitizer It is trimethylolpropane trimethacrylate (TMPTMA), the addition amount is 0.5 g, the conductive particle is carbon black (Japan Mitsubishi conductive carbon black 3030B), the addition amount is 150 g, and the inert filler is magnesium hydroxide Mg(OH)2 100g;

[0052] Control the roll temperature of the two-roll mill at 190°C, first add polyamide resin PA12 into the mill, wait until it is completely melted and cover the rolls, then add carbon b...

Embodiment 2

[0054] Switch the resin to polyamide PA11 (French Atofina M-BMN, melting point 186°C, density 1.07g / cm2), and the antioxidant consists of tetrakis[methyl-β-(3,5-di-tert-butyl-4 -Hydroxyphenyl) propionate] pentaerythritol ester (1010) 1.5g and auxiliary antioxidant dilauryl thiodipropionate (DLTP) 0.5g, a total of 2.0g, crosslinking agent bismaleimide ( BMI) is 1.0 g, the coupling agent vinyltriethoxysilane (A151) is 2.0 g, the lubricant stearic acid (Hst) is 1.0 g, the sensitizer trimethylolpropane trimethacrylate (TMPTMA ) is 0.5 g, conductive particle carbon black (3030B) is 130 g, and the inert filler is magnesium hydroxide 60 g;

[0055] The processing technology and method are the same as in Example 1, and the temperature of the double-rollers for refining is set to 200°C, and the molding temperature is set to 210°C, and its properties are shown in Table 2;

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Abstract

The invention provides a base material of a PTC (Positive Temperature Coefficient) thermistor, a PTC thermistor and a preparation method thereof. The base material of a PTC themistor comprise the following components in parts by weight: 100 parts of polyamide resin, 80-150 parts of conducting particles, 20-100 parts of inert filter, 0.5-3 parts of cross-linking agent, 0-1 part of nucleating agent, 0.5-5 parts of sensitizing agent, 0.5-3 parts of antioxidant, 0.5-2 parts of lubricant, 0-2 parts of coupling agent; wherein the polyamide resin can be one of or a mixture of several of polyamide11, polyamide12, polycaprolactam, polycaprylamide, polypelargonamide, polyhexamethylene sebacamide, polydecamethylene sebacamide and polyhexamethylene adipamide; the conducting particle is carbon black, graphite, metal particle or conductive ceramics; the sensitizing agent is a polyfunctional acrylic ester reactive monitor. The PTC thermistor disclosed by the invention is mainly applied to overcurrent protection of an electrical motor in the automobile field in a harsh environment condition, as also can be applied to other special fields with higher ambient temperature.

Description

technical field [0001] The invention relates to a PTC (Positive Temperature Coefficient, positive temperature coefficient) thermistor base material, a PTC thermistor using the base material, and a preparation method of the base material and the PTC thermistor. The PTC thermistor of the present invention is mainly used in the overcurrent protection of motors in the automotive field with relatively harsh environmental conditions, and can also be used in some other special fields with relatively high ambient temperatures. Background technique [0002] PTC (Positive Temperature Coefficient, positive temperature coefficient) thermistors made of polymer resins have been widely used in overcurrent protection in circuits. The material prepared by adding conductive particles to the crystalline resin can show a characteristic of positive temperature coefficient, that is, the PTC effect, that is, at normal temperature, the material shows a low resistance state, and when the temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02
Inventor 晏国安连铁军覃迎锋
Owner 深圳市长园维安电子有限公司
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