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

A technology of thermistor and substrate, 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: 2012-10-10
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

Examples

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preparation example Construction

[0045] Prepare the preparation method of the base material of PTC thermistor of the present invention, comprise the following steps:

[0046] 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, lubricant 0.5-2 parts, coupling agent 0-2 parts, after weighing, pre-mix first;

[0047] Step 2: Control the temperature of the two rollers of the two-roll mill at 190-290°C, then add 100 parts of polyamide resin between the two rollers to completely melt the resin, and then disperse and premix the mixture evenly in step 1 Put the material into the roller of the double-roller mill to make it fully mixed with the molten polyamide resin, and keep turning the material to achieve the purpose of fully melting and mixing. The mixing time is 20 minutes, and finally the sheet is discharged. The thickness of the ...

Embodiment 1

[0057] Take by weighing polyamide resin PA12 (Swiss EMS company, melting point 178 ℃, density 1.01g / cm2) 100g, antioxidant 2g is made of 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 acid Imide (BMI) 1.0g, coupling agent is silane coupling agent vinyltriethoxysilane (A151) 1.0g, lubricant is stearic acid (Hst), adding amount is 2.0g, sensitizer Trimethylolpropane trimethacrylate (TMPTMA), the addition is 0.5g, the conductive particle is carbon black (Mitsubishi Conductive Carbon Black 3030B), the addition is 150g, and the inert filler is magnesium hydroxide Mg(OH) 100g;

[0058] Control the roll temperature of the two-roll mill at 190°C, first add polyamide resin PA12 into the mill, and add carbon black, fillers, antioxidants, cross-linking agents and other additives after it is comp...

Embodiment 2

[0060] 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 composition, totally 2.0g, crosslinking agent bismaleimide ( BMI) is 1.0g, coupling agent vinyltriethoxysilane (A151) is 2.0g, lubricant stearic acid (Hst) is 1.0g, sensitizer trimethylolpropane trimethacrylate (TMPTMA ) is 0.5g, conductive particle carbon black (3030B) is 130g, and the inert filler is 60g of magnesium hydroxide;

[0061] 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 thermistor comprises 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 temperature...

Claims

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Application Information

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