PTC thermistor and substrate applied therein and manufacturing method thereof

A technology of thermistor and manufacturing method, applied in the direction of resistors with positive temperature coefficient, etc., can solve the problems of poor ability to withstand high current multiple shocks, low PTC strength, etc., and achieve the ability to withstand high current multiple shocks Good, low resistance, good for absorption

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 shortcomings of the existing PTC thermistors such as low PTC strength and poor ability to withstand multiple impacts of large currents, and provide a PTC with high strength and strong ability to withstand multiple impacts of high currents. PTC thermistor and its applied base material and its manufacturing method

Method used

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  • PTC thermistor and substrate applied therein and manufacturing method thereof
  • PTC thermistor and substrate applied therein and manufacturing method thereof

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preparation example Construction

[0041] The present invention also proposes the second preparation method of the thermistor, which includes the following steps:

[0042] Step 1: Preheat the conductive filler and auxiliary filler at 70-180°C for 2-24 hours before use;

[0043] Step 2: Pre-mix a polymer material, auxiliary filler, and antioxidant to make a masterbatch, mix it with another polymer material at room temperature, and mix it with conductive filler, coupling agent, crosslinking agent, and sensitizer The cross-linking agent is mixed at a temperature of 30-60 °C above the melting point of the polymer material, and then extruded or hot-pressed by a single-screw extruder;

[0044] Step 3: Composite the metal electrodes on the upper and lower surfaces of the sheet by hot pressing, and perform heat treatment, punch into chips on a punching machine and pass through gamma rays, electron accelerators or cobalt sources (Co 60 ) for radiation cross-linking, the radiation dose is 70~200KGY;

[0045] Step 4: Af...

Embodiment 1

[0049] First preheat the conductive filler and auxiliary filler in an oven at 110 degrees for 4 hours, and then put

[0050] Conductive filler: carbon black (VXC200 model produced by Cabot Corporation of the United States) 660g,

[0051] Auxiliary filler: magnesium hydroxide 600g,

[0052] Coupling agent: vinyltriethoxysilane 24g

[0053] Mix well in a high speed blender, mix the above mixture with

[0054] Polymer material: high-density polyethylene 1000g,

[0055] Cross-linking agent: DCP (dicumyl peroxide) 3.6g,

[0056] Sensitizing crosslinking agent: Trimethylolpropane triacrylate 30g,

[0057] Antioxidants: Tetrakis[methyl-β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester (Antioxidant 1010) 4g, and tris(2,4-diphosphite tert-butylphenyl) ester (antioxidant 168) 12g, put into the internal mixer and knead at 180°C, after 10 minutes of kneading time, the material will be crushed, and the above crushed product will be uniformly mixed at room temperatu...

Embodiment 2

[0064] First preheat the conductive filler and auxiliary filler in an oven at 110 degrees for 4 hours, and then put

[0065] Conductive filler: carbon black (model VXC605 produced by Cabot Corporation of the United States) 460g,

[0066] Auxiliary filler: alumina 800g,

[0067] Mix well at room temperature, then mix the above mixture with

[0068] Polymer material: 800g high-density polyethylene,

[0069] Sensitizing crosslinking agent: Trimethylolpropane trimethacrylate 20g,

[0070] Add it into the internal mixer and mix it at 180°C. After 10 minutes of mixing time, the material will be crushed. Mix the above crushed material evenly at room temperature and then mix it in the twin-screw extruder. The temperature of each section of the extruder Set at 170°C, 180°C, 190°C, and 200°C respectively, and extrude the pull sheet into a sheet with a thickness of 1.6mm;

[0071] Combine the nickel foil that has been roughened on one side on the upper and lower surfaces of the above...

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Abstract

A PCT thermistor comprises a substrate and two tinsel-shaped electrodes which are combined with two surfaces of the substrate. The substrate is made of the following components in weight percentage: 28-55% of high-polymer material; 22-32% of conductive filling material; 13-46% of auxiliary filling material; and 1-5% of auxiliary agent in processing. The high-polymer material is obtained through mixing one or multiple materials selected from: polyethylene, polypropylene, maleic anhydride grafted polyethylene, ethane-vinyl acetate copolymer, ethane-acrylic acid copolymer, polyvinylidene fluoride, polycaprolactam, polyhexamethylene adipamide, polydecamethylene sebacamide and polyundecylamide. The auxiliary agent in processing is one component or a mixture of multiple components selected from: an anti-oxidant, a coupling agent, a cross-linking agent and a sensitized cross-linking agent. The sensitized cross-linking agent is one component or multiple components selected from the unsaturated compounds of multiple functional groups with higher decomposition temperature. The PTC thermistor of the invention has the following advantages: high strength, and high resistance for multiple times of large current impact.

Description

technical field [0001] The invention relates to a thermistor and a manufacturing method thereof, in particular to a manufacturing method of a polymer positive temperature coefficient thermistor. Background technique [0002] Polymer PTC (Positive Temperature Coefficient, Positive Temperature Coefficient) thermistor is a new type of functional material developed in the 1990s. It is mainly made of insulating high Composite molecular polymer materials and conductive fillers can exhibit a positive temperature coefficient (Positive Temperature Coefficient, referred to as PTC) characteristics, that is, the resistivity increases significantly with the increase of temperature. At room temperature, this type of resistor has a low resistance value. When the temperature rises to the melting point of the polymer substrate, the resistivity begins to rise rapidly, and the resistance value can rapidly increase to more than 4 orders of magnitude. [0003] When the electrical equipment is...

Claims

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Application Information

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