CN1416141A - High molecular PTC thermistor and method for producing same - Google Patents
High molecular PTC thermistor and method for producing same Download PDFInfo
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- CN1416141A CN1416141A CN 02137203 CN02137203A CN1416141A CN 1416141 A CN1416141 A CN 1416141A CN 02137203 CN02137203 CN 02137203 CN 02137203 A CN02137203 A CN 02137203A CN 1416141 A CN1416141 A CN 1416141A
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Abstract
The macromolecular PTC thermistor is composed of the core material, and the metals foils pasted on the both sides of the core material; the extraction electrodes soldered on the said foils and the insulation layer. The core material is prepared by mixing the powdery conduction macromolecular composite material 1 and the powdery conduction macromolecule composite material 2. The weight percentage of the formulation for the said material 1 is high polymer 35%-50%, the carbon black 46%-60% and the processing agent 0.10%-10%. The weight percentage of the formulation for the said material 2 is high polymer 55%-70%, the carbon black 30%-45% and the processing agent 0.10%. The invention provides the performances of the low electric resistance value and the high the strength of PTC as well as raises the safe and dependability.
Description
Affiliated technical field
It is the electronic devices and components and the manufacture method thereof of primary raw material that a kind of high molecular PTC thermistor of the present invention and manufacture method thereof relate to conducting high polymers thing composite material.
Background technology
Usually, in the crystallization of filled conductive particle or hypocrystalline polymer composite, can show positive temperature coefficient PTC (positive temperature coefficient) phenomenon.That is to say that in certain temperature range, the resistivity of self can increase with the rising of temperature.These crystallizations or semi-crystalline polymer comprise polyethylene, polypropylene, Kynoar, polytrifluorochloroethylene, and their copolymer.Conducting particles comprises carbon black, graphite, carbon fiber, metal dust (as silver powder, copper powder, aluminium powder, nickel powder, stainless steel powder).When lower temperature, this class conductor presents lower resistivity, be elevated near its high molecular polymer fusing point and work as temperature, and when just reaching so-called " shutoff " temperature, the hurried rising of resistivity.Have the thermistor that this class electric conductor of ptc characteristics is made, be applied to the overcurrent protection setting of circuit.In the normal state; electric current in the circuit is less relatively; the thermistor actuator temperature is lower; and when the big electric current that is caused by fault passes through this from the renaturation fuse; its temperature can be elevated to " shutoff " temperature suddenly; cause its resistance value to become very big, so just make circuit be in a kind of approximate " open circuit " state, thereby protected other elements in the circuit.And after fault was got rid of, the temperature of thermistor descended, and its resistance value can return to the low resistance state again.
High molecular PTC thermistor has been widely applied in the various fields such as communication, computer, automobile, Industry Control, household electrical appliance.Is both to have required resistance low for battery protection with the problem that high molecular PTC thermistor faced, and has high PTC intensity again.And the conducting particles in the low resistance high molecular PTC material that occurs at present is generally carbon black, in order to reach than low resistance, often needs to add a large amount of carbon blacks, can cause element PTC intensity to reduce like this, can not play a very good protection to battery.In order to overcome the defective that above-mentioned technology exists, the invention provides a kind of new technical scheme.
Summary of the invention
The object of the present invention is to provide the high molecular PTC thermistor and the manufacturing process thereof of the high PTC intensity of a kind of low resistance.
The object of the invention can be achieved through the following technical solutions: a kind of high molecular PTC thermistor, it is by core and the tinsel that is covered on the core two sides, the insulating barrier formation that is welded on the extraction electrode on this tinsel outer surface and is coated on the outside, characteristics are that described core is formed by two kinds of Powdered conductive polymer composites mixing compactings, wherein, Powdered conductive polymer composite is mixed by high molecular polymer, carbon black, carbon black dispersant and other processing aid, and its prescription is by weight percentage:
Powdered conductive polymer composite 1
High molecular polymer 1 35%~50%
Carbon black 2 46%~60%
Processing aid 0.1%~10%
Powdered conductive polymer composite 2
High molecular polymer 2 55%~70%
Carbon black 2 30%~45%
Processing aid 0.1%~10%
On the technique scheme basis, high molecular polymer can be the blend of one or more polymer in polyethylene, polypropylene, Kynoar, poly-trichloroethylene etc. and their copolymer in the described Powdered conductive polymer composite component; High molecular polymer can be identical in described Powdered conductive polymer composite 1 and above-mentioned Powdered conductive polymer composite 2 components, also can be inequality; Described processing aid is carbon black dispersant, antioxidant, crosslinking accelerator, coupling agent, wherein the carbon black dispersion can be one or more in paraffin, the oxidic polyethylene, antioxidant can be phenols or aminated compounds, crosslinking accelerator can be the polyfunctional group unsaturated compound, as triallyl isocyanurate (TAIC), coupling agent is silane or titanate ester organic compound.Processing aid can be identical in described Powdered conductive polymer composite 1 and Powdered conductive polymer composite 2 components, also can be inequality; Carbon black is meant conductive carbon black, colour black and reinforcement carbon black in the described Powdered conductive polymer composite component, carbon black can be identical in described Powdered conductive polymer composite 1 and above-mentioned Powdered conductive polymer composite 2 components, also can be inequality.
Powdered conductive polymer composite particle diameter of the present invention is not more than 80 orders.
Manufacture method of the present invention is, the first step, respectively that core component high molecular polymer, carbon black, processing aid is mixing under 100~200 ℃ of temperature, the cooling back is pulverized abrasive dust and is made Powdered conductive polymer composite 1 and Powdered conductive polymer composite 2; Second step, will above-mentioned Powdered conductive polymer composite 1 and Powdered conductive polymer composite 2 according to a certain percentage fully after the mixing, making the two sides with mould pressing method, to paste the tinsel area be 100~1000cm
2, the composite sheet of thick 0.1~1.0mm; The 3rd step is with this composite sheet gamma-rays (Co
60) or electron irradiation crosslinked, dosage is 5~100Mrad; At last, sheet material is cut into the small pieces of certain size, extraction electrode in the welding, the coated insulation layer makes high molecular PTC thermistor outside.
The present invention compared with prior art, its core mixes compacting by two kinds of Powdered conductive polymer composites and forms, therefore being interspersed in the microstructure of core has the microcosmos area of different conductive characteristics and different ptc characteristicses, thereby has made the high molecular PTC thermistor of the high PTC intensity of low resistance.
Embodiment
Table 1
Unit: g
Powdered conductive polymer composite | High density polyethylene (HDPE) | Carbon black | The carbon black dispersant oxidic polyethylene | Antioxidant | Triallyl isocyanurate | Titanium coupling agent TCF |
????1 | ??334 | ??394 | ????40 | ????16 | ????8 | ????8 |
????2 | ??384 | ??344 | ????40 | ????16 | ????8 | ????8 |
Annotate: high density polyethylene (HDPE): the BHB5012 of Philips Petroleum Co.
Carbon black: the XC-72 of Cabot Co.,Ltd
Antioxidant: the U.S. big lake chemical industry ANOX70 of Co., Ltd
Each component in the table 1 is mixing even in banbury under 190 ℃ of temperature respectively, through cooling, behind the pulverizing abrasive dust, obtain particle diameter 120 purpose powder, it is even in stirrer for mixing respectively to get 700 grams then.Get above-mentioned powder 3 grams, it is clipped between the two-layer nickel plating Copper Foil, be put in the pressing mold, pressure 5MPa is pressed into area 200cm under 180 ℃ of conditions of temperature
2, thick 0.2mm sheet material.80 ℃ of heat treatments are after 16 hours, with gamma-rays (Co in vacuum drying oven
60) irradiation, dosage is 20Mrad, and then become the small pieces of 5mm*12mm size with the punch press punching out, weld 4mm*10mm respectively on its two sides, the extraction electrode of thick 0.13mm coats one deck polyester tape at last, promptly can be made into the high molecular PTC thermistor of normal temperature zero power resistance 20m Ω, in the time of 140 ℃, its zero power resistance is not less than 100K Ω.
Claims (4)
1. high molecular PTC thermistor, it is by core and the tinsel that is covered on the core two sides, the insulating barrier formation that is welded on the extraction electrode on this tinsel outer surface and is coated on the outside, it is characterized in that described core mixes compacting by two kinds of Powdered conductive polymer composites and forms, wherein, Powdered conductive polymer composite is mixed by high molecular polymer, carbon black, carbon black dispersant and other processing aid, and its prescription is by weight percentage:
Powdered conductive polymer composite 1
High molecular polymer 1 35%~50%
Carbon black 1 46%~60%
Processing aid 0.1%~10%
Powdered conductive polymer composite 2
High molecular polymer 2 55%~70%
Carbon black 2 30%~45%
Processing aid 0.1%~10%
2. a kind of high molecular PTC thermistor according to claim 1, it is characterized in that high molecular polymer can be the blend of one or more polymer in polyethylene, polypropylene, Kynoar, poly-trichloroethylene and their copolymer in the described Powdered conductive polymer composite component; High molecular polymer can be identical in described Powdered conductive polymer composite 1 and above-mentioned Powdered conductive polymer composite 2 components, also can be inequality; Described processing aid is carbon black dispersant, antioxidant, crosslinking accelerator, coupling agent, wherein the carbon black dispersion can be one or more in paraffin, the oxidic polyethylene, antioxidant can be phenols or aminated compounds, crosslinking accelerator can be the polyfunctional group unsaturated compound, coupling agent is silane or titanate ester organic compound, processing aid can be identical in described Powdered conductive polymer composite 1 and Powdered conductive polymer composite 2 components, also can be inequality; Carbon black is meant conductive carbon black, colour black and reinforcement carbon black in the described Powdered conductive polymer composite component, carbon black can be identical in described Powdered conductive polymer composite 1 and above-mentioned Powdered conductive polymer composite 2 components, also can be inequality.
3. according to claim 1,2 described modified model high molecular PTC thermistors, it is characterized in that above-mentioned Powdered conductive polymer composite particle diameter is not more than 80 orders.
4. according to the manufacture method of claim 1,2 described a kind of high molecular PTC thermistors, it is characterized in that the first step, respectively that core component high molecular polymer, carbon black, processing aid is mixing under 100~200 ℃ of temperature, the cooling back is pulverized abrasive dust and is made Powdered conductive polymer composite 1 and Powdered conductive polymer composite 2; Second step, will above-mentioned Powdered conductive polymer composite 1 and Powdered conductive polymer composite 2 fully after the mixing, making the two sides with mould pressing method, to paste the tinsel area be 100~1000cm
2, the composite sheet of thick 0.1~1.0mm; The 3rd step is with this composite sheet gamma-rays (Co
60) or electron irradiation crosslinked, dosage is 5~100Mrad; At last, sheet material is cut into the small pieces of certain size, extraction electrode in the welding, the coated insulation layer makes high molecular PTC thermistor outside.
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CN 02137203 CN1278340C (en) | 2002-09-27 | 2002-09-27 | High molecular PTC thermistor and method for producing same |
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CN 02137203 CN1278340C (en) | 2002-09-27 | 2002-09-27 | High molecular PTC thermistor and method for producing same |
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CN1416141A true CN1416141A (en) | 2003-05-07 |
CN1278340C CN1278340C (en) | 2006-10-04 |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100411067C (en) * | 2005-02-24 | 2008-08-13 | 深圳市固派电子有限公司 | Macromolecular positive temperature coefficient thermosensitive resistor and method for making same |
CN100416709C (en) * | 2004-12-23 | 2008-09-03 | 比亚迪股份有限公司 | Carbon oil in use for making carbon resistance element, preparation method, and prepared element of carbon resistance |
CN100427537C (en) * | 2006-02-15 | 2008-10-22 | 上海中大科技发展有限公司 | Carbon sensitive material, its preparation method and application |
CN103594214A (en) * | 2013-11-06 | 2014-02-19 | 中国科学技术大学 | Composite PTC (positive temperature coefficient) material for normal temperature heat control |
-
2002
- 2002-09-27 CN CN 02137203 patent/CN1278340C/en not_active Expired - Fee Related
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100416709C (en) * | 2004-12-23 | 2008-09-03 | 比亚迪股份有限公司 | Carbon oil in use for making carbon resistance element, preparation method, and prepared element of carbon resistance |
CN100411067C (en) * | 2005-02-24 | 2008-08-13 | 深圳市固派电子有限公司 | Macromolecular positive temperature coefficient thermosensitive resistor and method for making same |
CN100427537C (en) * | 2006-02-15 | 2008-10-22 | 上海中大科技发展有限公司 | Carbon sensitive material, its preparation method and application |
CN103594214A (en) * | 2013-11-06 | 2014-02-19 | 中国科学技术大学 | Composite PTC (positive temperature coefficient) material for normal temperature heat control |
CN103594214B (en) * | 2013-11-06 | 2016-03-30 | 中国科学技术大学 | Normal temperature thermal control compound ptc material |
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CN1278340C (en) | 2006-10-04 |
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Address after: Shanghai City, Siping Road No. 710 715Z Patentee after: Shanghai Changyuan Wayon Circuit Protection Co., Ltd. Address before: Room 201, 401 Jinqiao Road, Shanghai, Pudong Patentee before: Weian Thermoelectrical Materials Co., Ltd., Shanghai |
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