CN101763925A - Polymer positive temperature coefficient (PTC) chip and application thereof - Google Patents
Polymer positive temperature coefficient (PTC) chip and application thereof Download PDFInfo
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- CN101763925A CN101763925A CN200910200959A CN200910200959A CN101763925A CN 101763925 A CN101763925 A CN 101763925A CN 200910200959 A CN200910200959 A CN 200910200959A CN 200910200959 A CN200910200959 A CN 200910200959A CN 101763925 A CN101763925 A CN 101763925A
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Abstract
The invention relates to an electronic component for over-current protection, in particular to a polymer positive temperature coefficient (PTC) chip and the application thereof. The polymer PTC chip comprises two metal foil electrodes and a layer of polymer PTC composite conductive material which is sandwiched between the two metal foil electrodes in a compounding way. The polymer PTC composite conductive material comprises the following raw materials (components) by volume percent: 24.5-40 percent of organic polymer, 55-75 percent of conductive ceramic particles and 0.5-10 percent of carbon black. The polymer PTC chip has low resistance, stable electrical performance, good mechanical performance and excellent overall performance and is easy to process.
Description
Technical field
The present invention relates to a kind of electronic devices and components that are used for overcurrent protection, the polymer PTC overflow protection component that is specifically related to a kind of high polymer PTC chip and utilizes this high polymer PTC chip to make.
Background technology
Functional high molecule material is the focus of present material science research, and the high molecular composite conductive material with ptc characteristics is outstanding person wherein, and academia's industrial circle being is all is being researched and developed it enthusiastically so far.So-called high molecular PTC composite conducting material has the high molecular composite conductive material of PTC (positive temperature coefficient " positive temperature coefficient ") resistance characteristic exactly.That is to say that in certain temperature range, the resistivity of this electric conducting material self can increase with the rising of temperature.This high molecular PTC material is composited by macromolecular material filled conductive particle.Described macromolecular material comprises thermosetting polymer and thermoplastic polymer, and thermoplastic polymer comprises polyethylene, ethylene-methyl acrylate copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, Kynoar, polytrifluorochloroethylene etc.; Thermosetting polymer mainly contains epoxy resin.Conducting particles comprises carbon black, metal dust and the good powdered substance of some other conductivity.
Realize that at present commercial high molecular PTC composite conducting material has two kinds of systems, a kind of is carbon black-high molecular polymerization objects system, and another kind is nickel powder-high molecular polymerization objects system.The former is because carbon black is difficult for oxidation, so product stability is good, but the resistivity height is done small product size very big in order to obtain the low resistance product needed; Latter's good conductivity can prepare small size low resistance product, but because the easy oxidation of nickel powder, cause product electrical property instability, and owing in order to obtain the low resistance product, need in high molecular polymer, fill a large amount of nickel powders, make the mechanical property of materials poor, be not easy to processing.
Utilize the high molecular PTC composite conducting material to make the macromolecule overflow protecting element, can be used as the overcurrent protective device of circuit.It is connected in the circuit and uses, and lower by the electric current of macromolecule overflow protecting element during the circuit operate as normal, its temperature is lower, presents low resistance state, can not influence the circuit operate as normal.And when the big electric current that causes by fault when this macromolecule overflow protecting element, its temperature can raise suddenly, causes that himself resistance value becomes greatly suddenly, so just makes circuit present approximate off state, thereby plays the protective circuit effect.After fault was got rid of, the temperature of macromolecule overflow protecting element descended, and its resistance value can return to the low resistance state again.Therefore, this is a kind of fuse that can recover automatically in fact, has been widely applied in the fields such as computer, communication equipment, automotive electronics, family expenses and Industry Control electric equipment.
The macromolecule overflow protecting element is widely used in the overcurrent protection field, and the miniaturization of electronic devices and components is present development trends, and this also has higher requirement to the low resistanceization of high molecular PTC composite conducting material.How to obtain that resistance is low, electric performance stablity, the high molecular PTC composite conducting material that is easy to process, be the technical barrier that this area faces.
Summary of the invention
Technical problem to be solved by this invention provides that resistance is low, the high polymer PTC chip of electric performance stablity, and is easy to processing, overcomes the above-mentioned defective that prior art exists.
High polymer PTC chip of the present invention comprises two metal foil electrodes and is clipped in the compound formation of high molecular PTC composite conducting material layer between described two metal foil electrodes.Described high molecular PTC composite conducting material is by comprising that following component and proportion raw material are composited:
The organic high molecular polymer percent by volume is 24.5%-40%;
Conductivity ceramics particle volume percentage is 55%-75%;
The carbon black percent by volume is 0.5%-10%.
Preferably, described high molecular PTC composite conducting material is by comprising that following component and proportion raw material are composited:
The organic high molecular polymer percent by volume is 26%-38%;
Conductivity ceramics particle volume percentage is 55%-73.5%;
The carbon black percent by volume is 0.5%-10%.
Described macromolecular material is a thermoplastic polymer, comprises polyethylene, ethylene-methyl acrylate copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, Kynoar etc., preferred high density polyethylene (HDPE).
Described conductivity ceramics particle is an IV family metal nitride, perhaps IV family metal carbides, perhaps their mixture, preferred titanium carbide, titanium nitride.Why conducting particles selects IV family metal nitride or carbide, on the one hand is because IV family metal nitride and carbide have the electric conductivity near metal, but can oxidation in air, good stability; On the other hand, discover, if adopt other nonmetal conductive materials such as carbon blacks, graphite etc., though also have the characteristic that is difficult for oxidation, because its conductivity is relatively poor, if want to make low electrical resistant material, need loading very big, cause the ptc characteristics of these materials very poor, lose practical value.
Described carbon black comprises hard carbon black, colour carbon black and conductive black etc., preferred hard carbon black.Because above-mentioned conductivity ceramics particle and polyethylene kind thermoplastic polymer compatibility are poor, especially when high filler loading capacity, can cause the bad mechanical property of mixture, fragility is big, be difficult to be processed into sheet material, therefore need add a certain amount of carbon black simultaneously, utilize the lubricated and strengthening action of carbon black, improve the processability of product.
High polymer PTC chip of the present invention can adopt following method preparation:
Mixed material utilizes mixer mixing in proportion, then through the mill pulling-on piece PTC composite conducting material sheet material that secures satisfactory grades, utilize vulcanizing press metal foil electrode to be pressed to the two sides of above-mentioned sheet material, through behind the crosslinking with radiation, cut into the small pieces of certain size, promptly obtain high polymer PTC chip.
The present invention also provides a kind of polymer PTC overflow protection component, contains above-mentioned high polymer PTC chip.
The preparation method of polymer PTC overflow protection component is with the banded extraction electrode of weld metal on the both sides metal foil electrode of above-mentioned high polymer PTC chip, promptly obtains the high molecular PTC element.Can be applicable to the overcurrent protection of lithium ion chargeable battery.
Low, the electric performance stablity of high polymer PTC chip resistance of the present invention, and good mechanical property, easily processing, high comprehensive performance.
Description of drawings
Fig. 1 high polymer PTC chip schematic diagram, wherein
1---upper strata metal foil electrode
2---high molecular PTC composite conducting material layer
3---lower metal foil electrode
Fig. 2 high molecular PTC element schematic diagram, wherein
1---upper strata metal foil electrode
2---high molecular PTC composite conducting material layer
3---lower metal foil electrode
4---upper strata extraction electrode
5---lower floor extraction electrode
Embodiment
The present invention will be further elaborated below to enumerate concrete execution mode, should be understood that embodiment is used to limit the scope of the invention.
Embodiment 1-4
Numeral is a percent by volume in table 1 table
| Numbering | High density polyethylene (HDPE) | Carbon black | Titanium carbide | Titanium nitride |
| ??1 | ??26％ | ??0.5％ | ??73.5％ | |
| ??2 | ??38％ | ??1％ | ??61％ | |
| ??3 | ??32％ | ??3％ | ??30％ | ??35％ |
| ??4 | ??35％ | ??10％ | ??55％ | |
| Comparative Examples 1 | ??26％ | ??74％ |
Annotate: high density polyethylene (HDPE) Liaoyang petrochemical industry 7750
Carbon black CABOT, n660
Titanium carbide particle diameter 80nm
Titanium nitride particle diameter 40nm
Each component in the table 1 is mixed in proportion, utilize mixer mixing, then through the mill pulling-on piece, obtain the sheet material of thickness 0.32mm, by the cutting of the size of the long 400mm of wide 300mm, utilize vulcanizing press that the nickel plating Copper Foil of a roughening is pressed to the two sides of above-mentioned sheet material then, pass through crosslinking electron beam irradiation, dosage is 100Mrad, utilizes the punch press punching out to become the small pieces of the long 4mm of wide 3mm then.
Wherein, embodiment 1-4, behind the mixer mixing, the mill pulling-on piece can carry out continuously, the non-cracking phenomenon, it is smooth to obtain sheet surface.Comparative Examples 1 behind the mixer mixing, can not utilize mill to pull out continuous sheet, and rough surface, need use the vulcanizing press compression molding again, just can obtain the sheet material of surfacing.This explanation carbon black is obvious for improving the processing characteristics effect.
With the banded extraction electrode of weld metal on the both sides metal foil electrode of above-mentioned high polymer PTC chip, promptly obtain the high molecular PTC element, can use overcurrent protection with lithium ion chargeable battery.Its electrical property sees Table 2.
Table 2.
| Embodiment | Initial resistance (m Ω) | Holding current (A) | Operating current (A) | The 10A maximum actuation time (s) | Test in DC6V/1000 hour | DC6V/50A impacts 1000 times |
| ?1 | ??4～6 | ??3.5 | ??9.0 | ??5.0 | Not quick-friedly do not split | Not quick-friedly do not split |
| ?2 | ??9～16 | ??1.85 | ??4.8 | ??4.0 | Not quick-friedly do not split | Not quick-friedly do not split |
| ?3 | ??8～15 | ??1.9 | ??4.9 | ??4.0 | Not quick-friedly do not split | Not quick-friedly do not split |
| ?4 | ??6～13 | ??2.5 | ??8.0 | ??4.5 | Not quick-friedly do not split | Not quick-friedly do not split |
| Comparative Examples 1 | ??4～7 | ??3.5 | ??9.0 | ??5.0 | Not quick-friedly do not split | Not quick-friedly do not split |
Annotate: initial resistance--under-the room temperature condition, four-wire method is measured
Holding current--under-the room temperature condition, high molecular PTC element operate as normal maximum current
Operating current--under-the room temperature condition, the high molecular PTC element starts the minimum current of protection
Analytically show data as can be known: the present invention adopts polyethylene--conductivity ceramics particle---carbon black compound system high molecular PTC material preparation high molecular PTC element; internal resistance is low; holding current is big; operate time is fast; and can bear repeatedly heavy current impact; can tolerate long-time uninterrupted voltage, be fit to very much the overcurrent protection of lithium ion chargeable battery.Compare with Comparative Examples 1, the adding of carbon black when improving processing characteristics, can not influence electrical property.
Claims (8)
1. high polymer PTC chip, by two metal foil electrodes and be clipped in that high molecular PTC composite conducting material layer between described two metal foil electrodes is compound to be constituted, described high molecular PTC composite conducting material is composited by the raw material that comprises following component and volume per distribution ratio:
Organic high molecular polymer 24.5%-40%;
Conductivity ceramics particle 55%-75%
Carbon black 0.5%-10%.
2. high polymer PTC chip according to claim 1 is characterized in that described high molecular PTC composite conducting material is composited by the raw material that comprises following component and volume per distribution ratio:
Organic high molecular polymer 26%-38%;
Conductivity ceramics particle 55%-73.5%;
Carbon black 0.5%-10%.
3. high polymer PTC chip as claimed in claim 1 or 2 is characterized in that described organic high molecular polymer is a thermoplastic polymer.
4. as high polymer PTC chip as described in the claim 3, it is characterized in that described thermoplastic polymer is selected from polyethylene, ethylene-methyl acrylate copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer and Kynoar.
5. as high polymer PTC chip as described in the claim 3, it is characterized in that described thermoplastic polymer is a high density polyethylene (HDPE).
6. as high polymer PTC chip as described in the claim 1,2 or 4, it is characterized in that described conductivity ceramics particle is an IV family metal nitride, perhaps IV family metal carbides, perhaps their mixture.
7. as high polymer PTC chip as described in the claim 6, it is characterized in that described IV family metal nitride is a titanium nitride, described IV family metal carbides are titanium carbide.
8. a polymer PTC overflow protection component contains the arbitrary described high polymer PTC chip of claim 1-7.
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| CN200910200959A CN101763925A (en) | 2009-12-25 | 2009-12-25 | Polymer positive temperature coefficient (PTC) chip and application thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664081A (en) * | 2012-05-25 | 2012-09-12 | 上海第二工业大学 | Preparing method of ternary-system titanium-carbide-containing positive temperature coefficient thermistor |
| CN102723153A (en) * | 2012-06-20 | 2012-10-10 | 上海神沃电子有限公司 | PTC (positive temperature coefficient) core material with positive temperature coefficient characteristics and preparation method and application thereof |
| CN102924776A (en) * | 2011-08-10 | 2013-02-13 | 富致科技股份有限公司 | Positive-temperature-coefficient (PTC) material composition, and over-current protection assembly prepared through using PTC material |
| CN103242579A (en) * | 2012-02-03 | 2013-08-14 | 富致科技股份有限公司 | High electro-conductive polymer positive temperature coefficient composition and overcurrent protection element |
| CN103730219A (en) * | 2012-10-15 | 2014-04-16 | 富致科技股份有限公司 | High-molecular positive temperature coefficient overcurrent protective device |
| CN105590710A (en) * | 2014-10-22 | 2016-05-18 | 富致科技股份有限公司 | Positive temperature coefficient over-current protection component |
| CN109509599A (en) * | 2017-09-15 | 2019-03-22 | 聚鼎科技股份有限公司 | Over-current protecting element |
| CN112466728A (en) * | 2020-11-17 | 2021-03-09 | 云南电网有限责任公司昭通供电局 | Circuit breaker opening and closing coil protection type self-recovery fuse, manufacturing process and application thereof |
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| CN1495807A (en) * | 2001-11-15 | 2004-05-12 | Tdk株式会社 | On-machine posistor and its mfg. method |
| CN101162632A (en) * | 2006-10-10 | 2008-04-16 | 聚鼎科技股份有限公司 | Overcurrent protection component |
| CN101556852A (en) * | 2009-05-20 | 2009-10-14 | 上海科特高分子材料有限公司 | Macromolecular thermistance element and manufacturing method thereof |
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| CN1495807A (en) * | 2001-11-15 | 2004-05-12 | Tdk株式会社 | On-machine posistor and its mfg. method |
| CN101162632A (en) * | 2006-10-10 | 2008-04-16 | 聚鼎科技股份有限公司 | Overcurrent protection component |
| CN101556852A (en) * | 2009-05-20 | 2009-10-14 | 上海科特高分子材料有限公司 | Macromolecular thermistance element and manufacturing method thereof |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102924776A (en) * | 2011-08-10 | 2013-02-13 | 富致科技股份有限公司 | Positive-temperature-coefficient (PTC) material composition, and over-current protection assembly prepared through using PTC material |
| CN102924776B (en) * | 2011-08-10 | 2015-10-28 | 富致科技股份有限公司 | PTC material composition and the overcurrent protection assembly be made up of it |
| CN103242579A (en) * | 2012-02-03 | 2013-08-14 | 富致科技股份有限公司 | High electro-conductive polymer positive temperature coefficient composition and overcurrent protection element |
| CN103242579B (en) * | 2012-02-03 | 2015-06-17 | 富致科技股份有限公司 | High electro-conductive polymer positive temperature coefficient composition and overcurrent protection element |
| CN102664081A (en) * | 2012-05-25 | 2012-09-12 | 上海第二工业大学 | Preparing method of ternary-system titanium-carbide-containing positive temperature coefficient thermistor |
| CN102723153A (en) * | 2012-06-20 | 2012-10-10 | 上海神沃电子有限公司 | PTC (positive temperature coefficient) core material with positive temperature coefficient characteristics and preparation method and application thereof |
| CN102723153B (en) * | 2012-06-20 | 2016-05-18 | 上海神沃电子有限公司 | A kind of PTC core and manufacture and application with ptc characteristics |
| CN103730219A (en) * | 2012-10-15 | 2014-04-16 | 富致科技股份有限公司 | High-molecular positive temperature coefficient overcurrent protective device |
| CN105590710A (en) * | 2014-10-22 | 2016-05-18 | 富致科技股份有限公司 | Positive temperature coefficient over-current protection component |
| CN109509599A (en) * | 2017-09-15 | 2019-03-22 | 聚鼎科技股份有限公司 | Over-current protecting element |
| CN109509599B (en) * | 2017-09-15 | 2021-04-09 | 聚鼎科技股份有限公司 | Overcurrent protection element |
| CN112466728A (en) * | 2020-11-17 | 2021-03-09 | 云南电网有限责任公司昭通供电局 | Circuit breaker opening and closing coil protection type self-recovery fuse, manufacturing process and application thereof |
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Application publication date: 20100630 |