CN102127287A - Conductive composite material and PTC (Positive Temperature Coefficient) thermal sensitive element prepared from same - Google Patents
Conductive composite material and PTC (Positive Temperature Coefficient) thermal sensitive element prepared from same Download PDFInfo
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- CN102127287A CN102127287A CN2011100333241A CN201110033324A CN102127287A CN 102127287 A CN102127287 A CN 102127287A CN 2011100333241 A CN2011100333241 A CN 2011100333241A CN 201110033324 A CN201110033324 A CN 201110033324A CN 102127287 A CN102127287 A CN 102127287A
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Abstract
The invention relates to a conductive composite material and a PTC (Positive Temperature Coefficient) thermal sensitive element prepared from the same. The conductive composite material comprises the following components in parts by volume: 15-75 percent of crystalline polymer substrate and 25-85 percent of conductive filler with the particle size between 0.1 mum and 10 mum, wherein the conductive filler is dispersed in the crystalline polymer; and a coupling agent is titanic acid ester which accounts for 0.05-5 percent by volume of the conductive filler. The structural formula of the conductive composite material is (R1O)m-Ti-(OX-R2-Y)n, wherein radical R1 is alkyl, radical X is phosphoric acid easer base, radical R2 is alkyl, radical Y is acyloxy, m is more than or equal to 1 and less than or equal to 4, n is more than or equal to 1 and less than or equal to 3, and m and n are integers. The PTC thermal sensitive element prepared from the conductive composite material is formed by fixedly clamping a conductive composite material layer between two metal foils. The invention has the advantages that: the conductive material has high electric conductivity; and the PTC element prepared from the conductive composite material has very low room temperature resistivity, high PTC intensity and resistance reproducibility.
Description
Technical field
The present invention relates to the polymer core that uses in the PTC thermal sensing element, especially a kind of conducing composite material and PTC thermal sensing element prepared therefrom with low room temperature resistivity.
Background technology
Conducing composite material with resistance positive temperature coefficient can be kept extremely low resistance value under normal temps; and have the sharp characteristic of temperature variation reaction; promptly when overcurrent taking place in the circuit or crosses high temperature phenomenon; its resistance can be increased to a high value moment; make circuit be in trip condition, to reach the purpose of holding circuit element.Therefore can be connected to conducing composite material in the circuit, as the material of current sensing with resistance positive temperature coefficient.This type of material has been widely used on the electronic circuit protection components and parts.
Conducing composite material with resistance positive temperature coefficient generally is composited by at least a crystalline polymer and conductive filler material, is uniformly distributed in the described crystalline polymer on the conductive filler material macroscopic view.Polymkeric substance is generally polyolefine and multipolymer thereof, for example: and polyethylene or ethylene-vinyl acetate copolymer etc., and conductive filler material is generally carbon black, metal powder or conductivity ceramics powder.For the conducing composite material of making conductive filler material with carbon black with resistance positive temperature coefficient, because special aggregate structure and its surface of carbon black has polar group, make the tack of carbon black and polymkeric substance better, therefore have good resistance stability.But,, can't satisfy extremely low-resistance requirement because the conductive capability of carbon black itself is limited.With the metal powder is the conducing composite material with resistance positive temperature coefficient of conductive filler material, has extremely low resistance, but because the easy oxidation of metal powder, need seal conducing composite material, to stop because of the rising of the metal powder resistance that oxidation causes in air, and the volume of the PTC element that process is sealed can not effectively reduce, and is difficult to satisfy the requirement of electronic devices and components miniaturization.For obtaining extremely low resistance value and satisfying the requirement of electronic devices and components miniaturization, tend to gradually with the conductive filler material of metallic carbide ceramics powder (as titanium carbide) as low resistance resistance positive temperature coefficient conducing composite material, but make an addition to the large percentage of the metallic carbide ceramics powder in the conducing composite material, in polymkeric substance, disperse not goodly, cause its resistance further to reduce.The present invention discloses a kind of conducing composite material and PTC element prepared therefrom, and inferior class conducing composite material has good processing dispersiveness, and PTC element prepared therefrom has lower room temperature resistivity.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of conducing composite material, is particularly useful for having the PTC thermal sensing element of low room temperature resistivity.
A technical problem more to be solved by this invention is to provide the PTC thermal sensing element by above-mentioned conducing composite material preparation, and this PTC element has low room temperature resistivity.
The present invention solves the problems of the technologies described above the technical scheme of being taked: a kind of conducing composite material, and wherein, described conducing composite material comprises:
(a) crystalline polymer base material, account for described conducing composite material volume parts 15%～75%;
(b) conductive filler material is a kind of sosoloid, account for described conducing composite material volume parts 25%～85%, its particle diameter is 0.1 μ m～10 μ m, and volume specific resistance is not more than 200 μ Ω .cm, described conductive filler material is scattered among the described crystalline polymer;
(c) coupling agent is titanic acid ester, accounts for 0.05%～5% of conductive filler material volume, and its structural formula is:
Wherein, R
1Group is a kind of in ethyl, propyl group, butyl, amyl group or their isomers;
The X group is a kind of in carboxyl, sulfonic group, sulfuryl, phosphate-based, tetra-sodium ester group, the phosphorous acid ester group;
R
2Group is a kind of in hexyl, heptyl, octyl group or their isomers, and Y group is a kind of in acyloxy, the amino;
1≤m≤4,1≤n≤3, m, n are integer.
Concrete, be divided into 6 different functional zone in the structure of coupling agent.
Wherein, the effect of functional zone I is to make inorganics and titanium coupling; The effect of functional zone II is to have transesterification and crosslinked function; The functional zone III is for connecting the group at titanium center; The functional zone IV is that the long-chain of thermoplastic polymer tangles group; The functional zone V is the reactive group of thermosetting polymer; The functional zone VI is represented the functionality of titanic acid ester.
Concrete, the volume parts of crystalline polymer base material can be 15,20,25,30,35,40,45,50,55,60,65,70 or 75%.
The volume parts of conductive filler material can be 25,30,35,40,45,50,55,60,65,70,75,80 or 85%, and its particle diameter can be 0.1,0.5,1,2,3,4,5,6,7,8,9 or 10 μ m.
The amount that coupling agent accounts for the conductive filler material volume can be 0.05,0.1,0.2,0.5,1,1.5,2,2.5,3,3.5,4,4.5 or 5%.
The volume parts that described crystalline polymer base material accounts for described conducing composite material is preferably 25%～65%, and more excellent is 30%～55%.
The volume parts that described conductive filler material accounts for described conducing composite material is preferably 35%～75%, and more excellent is 40%～70%.
The particle diameter of described conductive filler material is preferably 0.01 μ m～50 μ m, and more excellent is 0.1 μ m～10 μ m.
The volume specific resistance of described conductive filler material is preferably less than 150 μ Ω .cm, and optimum is less than 100 μ Ω .cm.
The consumption of described coupling agent is preferably 0.1%～5% of conductive filler material volume, and more excellent is 0.5%～3%, most preferably is 0.5%～1.5%.
On the basis of such scheme, described crystalline polymer base material is one or more the mixture in Resins, epoxy, polyethylene, polypropylene, polyvinylidene difluoride (PVDF), ethylene-vinyl acetate copolymer, polymethylmethacrylate, the ethylene-acrylic acid copolymer.
On the basis of such scheme, described conductive filler material is the sosoloid of metallic carbide, and its composition comprises two or more in tantalum carbide, vanadium carbide, zirconium carbide, titanium carbide, niobium carbide, molybdenum carbide, hafnium carbide, chromium carbide, wolfram varbide, norbide, the beryllium carbide.
Concrete for example: tantalum carbide-niobium carbide sosoloid, contain chromium tungsten carbide-titanium carbide-tantalum carbide solid solution, titanium carbide-titanium carbide tungsten-tantalum carbide sosoloid, titanium carbide-titanium carbide tungsten-niobium carbide sosoloid, titanium carbide-titanium carbide tungsten solid solution, titanium carbide-titanium carbide tungsten-niobium carbide-tantalum carbide sosoloid, wolfram varbide-tantalum carbide sosoloid and titanium carbide-titanium carbide tantalate solid solution body etc.
On the basis of such scheme, described coupling agent is monoalkoxy type titanate coupling agent, monoalkoxy pyrophosphate type titanate coupling agent, sting one or more the mixture in mould assembly titanate coupling agent, corrdination type titanate coupling agent, the quaternary titanate coupling agent.
On the basis of such scheme, described conducing composite material comprises that also oxidation inhibitor, radiation crosslinker (often are called irradiation promotor, linking agent or crosslinking accelerator, cyanacrylate for example), dispersion agent, stablizer, non-conductive filler (as magnesium hydroxide), fire retardant, arc light inhibitor or other additives, the total amount of additive accounts for 20% of conducing composite material cumulative volume at the most, for example is 5% of conducing composite material cumulative volume.
Utilize the PTC thermal sensing element of above-mentioned conducing composite material preparation, the PTC thermal sensing element of described PTC thermal sensing element for having conducing composite material to constitute by clamping between two tinsels.
On the basis of such scheme, described two tinsels contain uneven surface, and this uneven surface directly contacts with described conducing composite material layer.
On the basis of such scheme, described two tinsels can be serially connected with protected circuit by conductive component.Conductive component can be connected on the tinsel by plating, electroless plating, printing, immersed solder, spot welding, Reflow Soldering or electroconductive binder, thereby the PTC element is connected in the circuit.Conductive component comprise any can with the structure unit of tinsel conducting, it can be an Any shape, for example, point-like, wire, band shape, sheet, column, other are irregularly shaped and their molectron.The base material of described conductive component can be any metal and alloy thereof that can conduct electricity, as nickel, copper, aluminium, zinc, tin and alloy thereof.
The PTC element has lower volume specific resistance in the time of 25 ℃.
Conducing composite material of the present invention and the PTC element that is prepared by this conducing composite material can be prepared as follows:
Crystalline polymer, conductive filler material and coupling agent are dropped into mixing equipment, under the temperature that is higher than more than the crystalline polymer melt temperature, mediate.Mixing equipment can be torque rheometer, Banbury mixer, mill, single screw extrusion machine or twin screw extruder.Then that melting mixing is good polymer processing becomes sheet material, and this can realize by extrusion moulding, compression molding or the machine thin-pass pulling-on piece of beginning to pratise.In general, the thickness of polymer sheet is 0.01～2.0mm, is preferably 0.05～1.0mm, is 0.1～0.5mm for the convenience of processing is more excellent.
The forming method of composite product is at the two sides of polymer sheet pressing tinsel, and when this composite product was divided into discrete component, tinsel played the effect of electrode.The method that composite product is divided into discrete component comprises any method of isolating discrete component from composite product, for example die-cut, etching, scribing and laser cutting.Described discrete component has planeform, promptly have with electric current to flow through vertical two surfaces of direction, and the distance between two surfaces is quite thin, i.e. and 3.0mm at the most, preferably 2.0mm at the most particularly preferably is maximum 0.5mm, for example 0.35mm.
Described discrete component can be an Any shape, and is irregularly shaped as square, trilateral, circle, rectangle, annular, Polygons or other.Tinsel comprises at least one uneven surface and this uneven surface contacts with the polymer sheet direct physical.The thickness of tinsel generally is at most 0.1mm, preferably is at most 0.07mm, 0.05mm at the most particularly, for example, 0.035mm.The tinsel that is suitable for comprises nickel, copper, aluminium, zinc and alloy thereof.
Usually can improve the stability of PTC element function by crosslinked or heat-treating methods.
Crosslinked can be chemically crosslinked or cross-linking radiation, for example can utilize crosslinking accelerator, electron beam irradiation or Co
60Irradiation is realized.The required irradiation dose of PTC element is generally less than 100Mrad, is preferably 1～50Mrad, and more excellent is 1～20Mrad.
Thermal treatment can be annealing, thermal cycling, high low temperature alternation, for example 80 ℃/-40 ℃ high low temperature alternations.Described annealed temperature environment can be the following any temperature of ptc layer base material decomposition temperature, for example is higher than the high temperature annealing and the low-temperature annealing that is lower than conducing composite material base material melt temperature of conducing composite material base material melt temperature.
PTC element of the present invention, less than 0.5 Ω .cm, preferably less than 0.1 Ω .cm, optimum is less than 0.05 Ω .cm 25 ℃ resistivity for it, therefore PTC element of the present invention is very low at 25 ℃ resistance, for example 1.0m Ω～15m Ω.
Superiority of the present invention is:
Conducing composite material of the present invention conducts electricity very well, and has very low room temperature resistivity, good PTC intensity and resistance reproducibility by the PTC element of this conducing composite material preparation.
Description of drawings
Fig. 1 is the structural representation of PTC thermal sensing element of the present invention.
Fig. 2 is the structural representation of PTC thermal sensing element embodiment of the present invention.
11-conducing composite material 12,12 '-tinsel
13,13 '-metal pins.
Embodiment
Below the present invention is described in further detail by specific embodiment.
Embodiment 1
Consisting of of the conducing composite material of preparation PTC thermal sensing element:
(a) the crystalline polymer volume parts is 40%, and it is 0.952g/cm with density that melt temperature is 135 ℃
3High density polyethylene(HDPE);
(b) conductive filler material is titanium carbide-titanium carbide tantalum-wolfram varbide Solid solution, and volume parts is 60%, and its particle diameter is less than 10 μ m, volume specific resistance 42 μ Ω .cm;
(c) coupling agent is monoalkoxy type sec.-propyl two oleic acid acyloxy titanic acid ester, and volume parts is 0.5% of a conductive filler material volume, density 0.976g/cm
3
The torque rheometer temperature is set in 180 ℃, rotating speed is 30 rev/mins, add crystalline polymer and coupling agent banburying earlier after 1 minute, add conductive filler material, continued banburying then 20 minutes, obtain conducing composite material, the conducing composite material that melting mixing is good is by mill thin-pass pulling-on piece, and obtaining thickness is the conducing composite material 11 of 0.20～0.25mm.
The preparation process of PTC thermal sensing element is as follows:
See also Fig. 1 for shown in the structural representation of PTC thermal sensing element of the present invention, conducing composite material 11 is placed laterally zygomorphic two tinsels 12, between 12 ', tinsel 12,12 ' has at least one uneven surface, and described uneven surface directly contacts with conducing composite material 11.Pass through the method for hot pressing again with conducing composite material 11 and tinsel 12,12 ' is closely linked, the temperature of hot pressing is 180 ℃, elder generation's preheating 5 minutes, then with the pressure minute-pressure of 5MPa 3 minutes, with the pressure hot pressing of 12MPa 10 minutes, on chilling press, colded pressing then 8 minutes again, it is die-cut into the discrete component of 3 * 4mm with mould.
See also Fig. 2 at last for shown in the structural representation of PTC thermal sensing element embodiment of the present invention, the method by Reflow Soldering is connected two tinsels, 12,12 ' surface with two metal pins 13,13 '.
Embodiment 2
The step of preparation conducing composite material and PTC thermal sensing element is identical with embodiment 1, but the volume parts of coupling agent in the conducing composite material 0.5% is increased to 1.0% by what account for the conductive filler material volume.
The electrical specification of the PTC thermal sensing element of present embodiment is as shown in table 1.
Embodiment 3
The step of preparation conducing composite material and PTC thermal sensing element is identical with embodiment 1, but the volume parts of coupling agent in the conducing composite material 0.5% is increased to 1.5% by what account for the conductive filler material volume.
The electrical specification of the PTC thermal sensing element of present embodiment is as shown in table 1.
Embodiment 4
The step of preparation conducing composite material and PTC thermal sensing element is identical with embodiment 1, but the volume parts of coupling agent in the conducing composite material 0.5% is increased to 2.0% by what account for the conductive filler material volume.
The electrical specification of the PTC thermal sensing element of present embodiment is as shown in table 1.
Embodiment 5
The step of preparation conducing composite material and PTC thermal sensing element is identical with embodiment 2, but the coupling agent that adopts is monoalkoxy type sec.-propyl three oleic acid acyloxy titanic acid ester, and addition is to account for 1.0% of conductive filler material volume, density 1.01g/cm
3
The electrical specification of the PTC thermal sensing element of present embodiment is as shown in table 1.
Comparative example
The step of preparation conducing composite material and PTC thermal sensing element is identical with embodiment 1, but does not add any coupling agent in the conducing composite material.
The electrical specification of the embodiment of the invention and comparative example PTC thermal sensing element is as shown in table 1.
Table 1 be PTC element by conducing composite material of the present invention preparation after triggering under the condition of 6V/50A, the resistance test data after placing 1 hour in 25 ℃ the temperature environment.
R in the table 1 represents by Reflow Soldering two metal pins 13,13 ' resistance of PTC element before of burn-oning on two tinsels, 12, the 12 ' surface of PTC element;
R
0The finished product resistance of representing described PTC thermal sensing element;
R
1Represent that described PTC element continued energising (6V/50A) after 6 seconds, measured resistance value after placing 1 hour in 25 ℃ the temperature environment;
R
25Represent that described PTC thermal sensing element continued energising (6V/50A) after 6 seconds, cut off the power supply 60 seconds, so circulate 25 times, then measured resistance value after placing 1 hour in 25 ℃ the temperature environment;
R
50Represent that described PTC thermal sensing element continued energising (6V/50A) after 6 seconds, cut off the power supply 60 seconds, so circulate 50 times, then measured resistance value after placing 1 hour in 25 ℃ the temperature environment;
R
100Represent that described PTC thermal sensing element continued energising (6V/50A) after 6 seconds, cut off the power supply 60 seconds, so circulate 100 times, then measured resistance value after placing 1 hour in 25 ℃ the temperature environment.
As can be seen from Table 1: embodiment 1 to 5 and comparative example have the crystalline polymer and the conductive filler material of equal volume umber, but have all added a certain amount of coupling agent among the embodiment 1 to 5, and its finished product resistance value is littler than the comparative example that does not add coupling agent.And among the embodiment 2, under the situation of identical conduction packing volume umber, when the volume parts of coupling agent is 1.0%, have minimum resistance.
The employed conducing composite material of PTC thermal sensing element of the present invention has strengthened the conductive network in the matrix material owing to added the coupling agent that can improve the conductive filler material dispersion state, therefore has very low resistance value.Therefore and employed conductive filler material is difficult for oxidation, need not to make conducing composite material avoid oxidation by the mode of sealing, and can prepare that to have the loaded current area be undersized PTC element such as 1206,0805,0603,0402.
Content of the present invention and characteristics have disclosed as above; yet protection scope of the present invention should be not limited to the content that embodiment discloses; and the combination of all the elements that should be included in the different piece to be embodied; and variously do not deviate from replacement of the present invention and modification, and contained by claims of the present invention.
Claims (10)
1. conducing composite material, it is characterized in that: described conducing composite material comprises:
(a) crystalline polymer base material, account for described conducing composite material volume parts 15%～75%;
(b) conductive filler material is a kind of sosoloid, account for described conducing composite material volume parts 25%～85%, its particle diameter is 0.1 μ m～10 μ m, and volume specific resistance is not more than 200 μ Ω .cm, described conductive filler material is scattered among the described crystalline polymer;
(c) coupling agent is titanic acid ester, accounts for 0.05%～5% of conductive filler material volume, and its structural formula is:
Wherein, R
1Group is a kind of in ethyl, propyl group, butyl, amyl group or their isomers;
The X group is a kind of in carboxyl, sulfonic group, sulfuryl, phosphate-based, tetra-sodium ester group, the phosphorous acid ester group;
R
2Group is a kind of in hexyl, heptyl, octyl group or their isomers, and Y group is a kind of in acyloxy, the amino;
1≤m≤4,1≤n≤3, and m, n are integer.
2. conducing composite material according to claim 1 is characterized in that: described crystalline polymer base material is one or more the mixture in Resins, epoxy, polyethylene, polypropylene, polyvinylidene difluoride (PVDF), ethylene-vinyl acetate copolymer, polymethylmethacrylate, the ethylene-acrylic acid copolymer.
3. conducing composite material according to claim 1, it is characterized in that: described conductive filler material is the sosoloid of metallic carbide, comprises two kinds or above mixture in tantalum carbide, vanadium carbide, zirconium carbide, titanium carbide, niobium carbide, molybdenum carbide, hafnium carbide, chromium carbide, wolfram varbide, norbide, the beryllium carbide.
4. conducing composite material according to claim 1 is characterized in that: described coupling agent is monoalkoxy type titanate coupling agent, monoalkoxy pyrophosphate type titanate coupling agent, sting one or more the mixture in mould assembly titanate coupling agent, corrdination type titanate coupling agent, the quaternary titanate coupling agent.
5. conducing composite material according to claim 4 is characterized in that: described coupling agent accounts for 0.5%～1.5% of conductive filler material volume.
6. conducing composite material according to claim 1, it is characterized in that: described conducing composite material also comprises oxidation inhibitor, radiation crosslinker, dispersion agent, stablizer, non-conductive filler, fire retardant, arc light inhibitor or other additives, and the total amount of additive accounts for 20% of conducing composite material cumulative volume at the most.
7. utilize the PTC thermal sensing element of the described conducing composite material preparation of one of claim 1 to 6, it is characterized in that: the PTC thermal sensing element of described PTC thermal sensing element for having conducing composite material to constitute by clamping between two tinsels.
8. the PTC thermal sensing element of conducing composite material preparation according to claim 7, it is characterized in that: described two tinsels contain uneven surface, and this uneven surface directly contacts with described conducing composite material layer.
9. at the PTC thermal sensing element of the described conducing composite material preparation of claim 7, it is characterized in that: described two tinsels are serially connected with protected circuit by conductive component.
10. the PTC thermal sensing element of conducing composite material preparation according to claim 7, it is characterized in that: the PTC thermal sensing element is the PTC element with low room temperature resistivity.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102660106A (en) * | 2012-05-18 | 2012-09-12 | 上海神沃电子有限公司 | Phenylthiocarbamide (PTC) composite material and PTC chip prepared by same and preparation method |
| CN102964663A (en) * | 2012-12-10 | 2013-03-13 | 云南昆钢新型复合材料开发有限公司 | Polyethylene laminated metal composite isolation membrane |
| CN102975456A (en) * | 2012-12-10 | 2013-03-20 | 云南昆钢新型复合材料开发有限公司 | Anti-sticking isolation film of polyethylene-polypropylene laminated metal composite material |
| CN103198910A (en) * | 2012-01-06 | 2013-07-10 | 聚鼎科技股份有限公司 | Thermistor element |
| CN103205056A (en) * | 2012-01-17 | 2013-07-17 | 比亚迪股份有限公司 | Positive temperature coefficient composite material and thermistor |
| CN103589110A (en) * | 2012-08-13 | 2014-02-19 | 上海微聚电子科技有限公司 | Polymer PTC composite material and method for preparing polymer PTC chip by using the material |
| CN103642172A (en) * | 2013-12-06 | 2014-03-19 | 上海长园维安电子线路保护有限公司 | Conductive composite material with high heat stability and positive temperature coefficient (PTC) thermo-sensitive element prepared thereby |
| CN108760835A (en) * | 2018-06-26 | 2018-11-06 | 合肥萃励新材料科技有限公司 | A kind of benzene homologues gas detecting element |
| CN109016731A (en) * | 2018-06-07 | 2018-12-18 | 太仓萃励新能源科技有限公司 | A kind of high-temp PTC material and circuit protecting element |
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| CN101887766A (en) * | 2010-07-08 | 2010-11-17 | 上海长园维安电子线路保护股份有限公司 | Conductive composite material with resistance positive temperature coefficient and over-current protection element |
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| CN1150314A (en) * | 1995-07-25 | 1997-05-21 | Tdk株式会社 | Organic PTC thermistor |
| CN101887766A (en) * | 2010-07-08 | 2010-11-17 | 上海长园维安电子线路保护股份有限公司 | Conductive composite material with resistance positive temperature coefficient and over-current protection element |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103198910A (en) * | 2012-01-06 | 2013-07-10 | 聚鼎科技股份有限公司 | Thermistor element |
| CN103198910B (en) * | 2012-01-06 | 2016-04-06 | 聚鼎科技股份有限公司 | Thermistor element |
| CN103205056A (en) * | 2012-01-17 | 2013-07-17 | 比亚迪股份有限公司 | Positive temperature coefficient composite material and thermistor |
| CN103205056B (en) * | 2012-01-17 | 2016-03-30 | 比亚迪股份有限公司 | A kind of Positive temperature coefficient composite material and a kind of thermistor |
| CN102660106A (en) * | 2012-05-18 | 2012-09-12 | 上海神沃电子有限公司 | Phenylthiocarbamide (PTC) composite material and PTC chip prepared by same and preparation method |
| CN103589110A (en) * | 2012-08-13 | 2014-02-19 | 上海微聚电子科技有限公司 | Polymer PTC composite material and method for preparing polymer PTC chip by using the material |
| CN102964663A (en) * | 2012-12-10 | 2013-03-13 | 云南昆钢新型复合材料开发有限公司 | Polyethylene laminated metal composite isolation membrane |
| CN102975456A (en) * | 2012-12-10 | 2013-03-20 | 云南昆钢新型复合材料开发有限公司 | Anti-sticking isolation film of polyethylene-polypropylene laminated metal composite material |
| CN102975456B (en) * | 2012-12-10 | 2015-08-05 | 云南昆钢新型复合材料开发有限公司 | The antiseized barrier film of a kind of polyethylene-polypropylene layered metal composite |
| CN103642172A (en) * | 2013-12-06 | 2014-03-19 | 上海长园维安电子线路保护有限公司 | Conductive composite material with high heat stability and positive temperature coefficient (PTC) thermo-sensitive element prepared thereby |
| CN109016731A (en) * | 2018-06-07 | 2018-12-18 | 太仓萃励新能源科技有限公司 | A kind of high-temp PTC material and circuit protecting element |
| CN108760835A (en) * | 2018-06-26 | 2018-11-06 | 合肥萃励新材料科技有限公司 | A kind of benzene homologues gas detecting element |
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Application publication date: 20110720 |