CN1111310C - Thermosensitive resistor and its manufacture - Google Patents
Thermosensitive resistor and its manufacture Download PDFInfo
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- CN1111310C CN1111310C CN 99124219 CN99124219A CN1111310C CN 1111310 C CN1111310 C CN 1111310C CN 99124219 CN99124219 CN 99124219 CN 99124219 A CN99124219 A CN 99124219A CN 1111310 C CN1111310 C CN 1111310C
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Abstract
The present invention relates to a thermal resistor and a manufacturing method thereof. The thermal resistor is composed of a core material, metal foil sheets, layer-shaped or lead-shaped extraction electrodes and an insulation layer, wherein the metal foil sheets are attached to both surfaces of the core material; the layer-shaped or lead-shaped extraction electrodes are welded on the outer surfaces of the metal foil sheets; the insulation layer is coated on the outer surface of the thermal resistor; the core material is formed by compounding macromolecule PTC materials of which the formula comprises: 40 to 60 wt% of heavy polymer, 30 to 59 wt% of conductive filler, 0 to 20 wt% of inorganic filler and 1 to 5 wt% of processing agent. Compared with the prior art, the thermal resistor of the present invention has low heat transformation temperature and high PTC property.
Description
The present invention relates to conducting high polymers thing composite material is the electronic devices and components of primary raw material, relates in particular to a kind of thermistor and manufacture method thereof.
As everyone knows, the resistivity of a lot of electric conducting materials varies with temperature.Conductor with positive temperature coefficient (PTC) characteristic, in certain temperature range, the resistivity of self can increase with the rising of temperature.After the high molecular polymer of mass part crystallization and the conducting particles blend, has the obvious PTC characteristic.These partially crystalline polymers comprise polyethylene, polypropylene, Kynoar, polytrifluorochloroethylene, nylon, poly terephthalic acid diethylester, polybutyl terapthalate, polyformaldehyde etc., and their copolymer.Conducting particles comprises the glass microballoon of carbon black, graphite, carbon fiber, metal dust (as silver powder, copper powder, aluminium powder, nickel powder, stainless steel powder etc.), metal oxide and plating metal on surface etc.When lower temperature, this class conductor presents lower resistivity, be elevated near its high molecular polymer fusing point and work as temperature, and during just so-called " shutoff " temperature, the hurried rising of resistivity.This class conductor with ptc characteristics has been made thermistor, is applied to the overcurrent and overheating protection equipment 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 thermistor; its temperature can be elevated to " shutoff " temperature suddenly, perhaps because of other reasons makes circuit overheated, all can 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.
Thermistor has been widely applied in communication, computer, automobile, Industry Control, the electronics various fields.At present the ptc characteristics of the low resistance that occurs, low thermal transition temperature high molecular PTC material is relatively poor, that is to say reach " shutoffs " temperature after, the multiplying power of its resistance rising is less, can not play good insulation effect.
Purpose of the present invention is exactly to provide a kind of for the defective that overcomes described prior art existence to have than low resistance low thermal transition temperature, the thermistor that ptc characteristics is good.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of thermistor, it is by core and the tinsel that is covered on this core two sides, the insulating barrier formation that is welded on stratiform or the lead-in wire shape extraction electrode on this tinsel outer surface and is coated on the outside, it is characterized in that described core is composited by the high molecular PTC material (A) that has low thermal transition temperature respectively and the high molecular PTC material (B) of higher ptc characteristics, its composite bed is at least two-layer, described core prescription following (percetage by weight): high molecular polymer 40%～60%, conductive filler 30%～59%, inorganic filler 0～20%, processing aid 1～5%; Described high molecular polymer can be made up of the blend of wherein a kind of of following polymer or two or more polymer wherein, and these polymer mainly are: polyethylene, polypropylene, poly-1-butylene, Kynoar, polytrifluorochloroethylene, nylon, poly terephthalic acid diethylester, polybutyl terapthalate, ethylene-vinyl acetate copolymer, vinyl-acrylate copolymer; Described conductive filler can be made up of following material two or more mixtures of material a kind of or wherein wherein, and these materials mainly are carbon black, graphite, carbon fiber, metal dust, metal oxide etc.; Described inorganic filler mainly is the inorganic matter of particle diameter＜50 μ m, as magnesium oxide, aluminium oxide, silicon dioxide, potter's clay, talcum powder, calcium carbonate, magnesium hydroxide, aluminium hydroxide; Described processing aid is meant antioxidant, crosslinking accelerator, coupling agent, and wherein antioxidant can be phenols or aminated compounds, and crosslinking accelerator can be the polyfunctional group unsaturated compound, and coupling agent can be silane or titanate ester organic compound.
Described composite bed is two-layer, respectively is up and down material (A) layer and material (B) layer.
Described composite bed is three layers, and the centre is material (B) layer, respectively is up and down material (A) layer.
Described composite bed is three layers, and the centre is material (A) layer, respectively is up and down material (B) layer.
A kind of manufacture method of thermistor is characterized in that core component high molecular polymer, conductive filler, inorganic filler and processing aid mixingly under 100～200 ℃ of temperature, and making area with mold pressing or the method extruded then is 100～1000cm
2, the sheet material of thick 0.1～1.0mm; The method that reusable heat is pressed is carried out the sheet material that has low thermal transition temperature and high ptc characteristics respectively compound, makes core; On hot press, tinsel is compound in two surfaces of described core, makes composite sheet, again with this composite sheet gamma-rays (Co
60) or electron beam to irradiate crosslinked, dosage is 5～100Mrad, and then composite sheet is slit into the small pieces of certain size, sheet or lead-in wire shape metal electrode in the welding, and the outside behind the coated insulation layer, promptly obtains the polymer thermistor device again.
A kind of manufacture method of thermistor is characterized in that core component high molecular polymer, conductive filler, inorganic filler and processing aid mixingly under 100～200 ℃ of temperature, and making area with mold pressing or the method extruded then is 100～1000cm
2, the sheet material of thick 0.1～1.0mm; The method that reusable heat is pressed is carried out the sheet material that has low thermal transition temperature and high ptc characteristics respectively compound, makes core; Again with this core gamma-rays (Co
60) or electron beam to irradiate crosslinked, dosage is 5～100Mrad, on hot press, tinsel is compound in two surfaces of described core then, make composite sheet, again composite sheet is slit into the small pieces of certain size, sheet or lead-in wire shape metal electrode in the welding, outside behind the coated insulation layer, promptly obtain the polymer thermistor device again.
Compared with prior art, advantage of the present invention is to have adopted the combined type core, has both had lower thermal transition temperature, has the high PTC characteristic again.Product of the present invention also has characteristics such as resistance is low, power consumption is little, action is fast, recovery time is short, anti-high-rate performance is good, can use repeatedly.
Accompanying drawing is the composite construction schematic diagram of the core in the product of the present invention.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment 1:
Table 1
Unit: g
| High density polyethylene (HDPE) | Carbon black | Magnesium hydroxide | Antioxidant | Crosslinking coagent | Coupling agent |
| 400 | 380 | 50 | 2 | 2 | 1 |
Annotate: 135 ℃ of high density polyethylene (HDPE) fusing points
Table 2
| Vinyl-acrylate copolymer | Carbon black | Antioxidant | Crosslinking coagent | Coupling agent |
| 400 | 400 | 2 | 2 | 1 |
Annotate: 85 ℃ of vinyl-acrylate copolymer fusing points
Each component in the table 1 is mixing even in banbury under 200 ℃ of temperature, through cooling, place it in after the pulverizing in the pressing mold, pressure 5Mpa is pressed into area 200cm under 180 ℃ of conditions of temperature
2, thick 0.2mm sheet material (B)
Each component in the table 2 is mixing even in banbury under 140 ℃ of temperature, through cooling, place it in after the pulverizing in the pressing mold, pressure 5Mpa is pressed into area 200cm under 140 ℃ of conditions of temperature
2, thick 0.2mm sheet material (A)
Sheet material (A) and sheet material (B) are stacked, and in pressing mold, pressure 5Mpa is pressed into thick 0.35mm, area 200cm under 160 ℃ of the temperature
2Composite core material.
Nickel sheet behind the surface coarsening after smooth, at pressure 5Mpa, is hot-pressed onto the two-sided of core under 160 ℃ of conditions of temperature, and 80 ℃ of heat treatments are after 8 hours, with gamma-rays (Co in vacuum drying oven
60) irradiation, dosage is 20Mrad, strike out the small pieces of 5 * 12mm then, and then the thick 0.10mm that burn-ons respectively on the two sides, the sheet metal electrode of 4 * 10mm size, can make the thermistor of the polymer about zero power resistance 0.10 Ω, 80 ℃ of its minimum thermal transition temperatures, the ratio of its resistance value and its resistance value in the time of 20 ℃ in the time of 130 ℃
Be not less than 10
5
Embodiment 2:
Prescription is with embodiment 1
Each component in the table 1 is mixing even in banbury under 200 ℃ of temperature, through cooling, place it in after the pulverizing in the pressing mold, pressure 5Mpa is pressed into area 200cm under 180 ℃ of conditions of temperature
2, thick 0.1mm sheet material (B)
Each component in the table 2 is mixing even in banbury under 140 ℃ of temperature, through cooling, place it in after the pulverizing in the pressing mold, pressure 5Mpa is pressed into area 200cm under 140 ℃ of conditions of temperature
2, thick 0.2mm sheet material (A)
Sheet material (A) and sheet material (B) are stacked according to (B)-(A)-(B) order, and in pressing mold, pressure 5Mpa is pressed into thick 0.35mm, area 200cm under 160 ℃ of the temperature
2Composite core material.
Nickel sheet behind the surface coarsening after smooth, at pressure 5Mpa, is hot-pressed onto the two-sided of core under 160 ℃ of conditions of temperature, and 80 ℃ of heat treatments are after 8 hours, with gamma-rays (Co in vacuum drying oven
60) irradiation, dosage is 20Mrad, strike out the small pieces of 5 * 12mm then, and then the thick 0.10mm that burn-ons respectively on the two sides, the sheet metal electrode of 4 * 10mm size, can make the polymer thermistor device about zero-power resistance 0.10 Ω, 80 ℃ of its minimum thermal transition temperatures, the ratio of its resistance value and its resistance value in the time of 20 ℃ in the time of 130 ℃
Be not less than 10
5
Embodiment 3
Prescription is with embodiment 1
Each component in the table 1 is mixing even in banbury under 200 ℃ of temperature, through cooling, place it in after the pulverizing in the pressing mold, pressure 5Mpa is pressed into area 200cm under 180 ℃ of conditions of temperature
2, thick 0.2mm sheet material (B)
Each component in the table 2 is mixing even in banbury under 140 ℃ of temperature, through cooling, place it in after the pulverizing in the pressing mold, pressure 5Mpa is pressed into area 200cm under 140 ℃ of conditions of temperature
2, thick 0.1m sheet material (A)
Sheet material (A) and sheet material (B) are stacked according to (A)-(B)-(A) order, and in pressing mold, pressure 5Mpa is pressed into thick 0.35mm, area 200cm under 160 ℃ of the temperature
2Composite core material.
Nickel sheet behind the surface coarsening after smooth, at pressure 5Mpa, is hot-pressed onto the two-sided of core under 160 ℃ of conditions of temperature, and 80 ℃ of heat treatments are after 8 hours, with gamma-rays (Co in vacuum drying oven
60) irradiation, dosage is 20Mrad, strike out the small pieces of 5 * 12mm then, and then the thick 0.10mm that burn-ons respectively on the two sides, the sheet metal electrode of 4 * 10mm size, can make the polymer thermistor device about zero-power resistance 0.10 Ω, 80 ℃ of its minimum thermal transition temperatures, the ratio of its resistance value and its resistance value in the time of 20 ℃ in the time of 130 ℃
Be not less than 10
5
Embodiment 4～6
Radiation mode changes electron beam irradiation into, and irradiation dose is identical with embodiment 1～3 respectively with other conditions, can obtain 1～3 similar product with embodiment.
Embodiment 7～12
The preparation of core is used extruder instead and is extruded, and the control of each section of extruder temperature is set at respectively:
110 ℃ 120 ℃ 130 ℃ 140 ℃ of sheet materials (A)
150 ℃ 160 ℃ 170 ℃ 180 ℃ of sheet materials (B)
The melt of extruding is finalized the design with calender, cuts into the sheet material of certain size after the cooling again, and other conditions are identical with embodiment 1～6 respectively, obtains the product similar to embodiment 1～6 respectively.
Embodiment 13
Table 3
Unit: g
| High density polyethylene (HDPE) | Carbon black | Magnesium hydroxide | Antioxidant | Crosslinking coagent | Coupling agent |
| 410 | 370 | 80 | 2 | 2 | 2 |
Annotate: 135 ℃ of high density polyethylene (HDPE) fusing points
Table 4
| Vinyl-acrylate copolymer | Carbon black | Antioxidant | Crosslinking coagent | Coupling agent |
| 400 | 380 | 2 | 2 | 2 |
Annotate: 102 ℃ of vinyl-acrylate copolymer fusing points
Each component in the table 3 is mixing even in banbury under 200 ℃ of temperature, through cooling, place it in after the pulverizing in the pressing mold, pressure 5Mpa is pressed into area 200cm under 180 ℃ of conditions of temperature
2, thick 0.2mm sheet material (B)
Each component in the table 4 is mixing even in banbury under 160 ℃ of temperature, through cooling, place it in after the pulverizing in the pressing mold, pressure 5Mpa is pressed into area 200cm under 140 ℃ of conditions of temperature
2, thick 0.2mm sheet material (A)
Sheet material (A) and sheet material (B) are stacked, and in pressing mold, pressure 5Mpa is pressed into thick 0.35mm, area 100cm under 160 ℃ of the temperature
2Composite core material.
Nickel sheet behind the surface coarsening after smooth, at pressure 5Mpa, is hot-pressed onto the two-sided of core under 160 ℃ of conditions of temperature, and 85 ℃ of heat treatments are after 8 hours, with gamma-rays (Co in vacuum drying oven
60) irradiation, dosage is 20Mrad, strikes out the little garden sheet of Φ 9.0mm then on punch press, the tin-coated copper lead-in wire of the Φ 0.6mm that burn-ons respectively on the two sides again, and then seal material package with epoxy and seal, obtain and the similar product of embodiment 1 electrical property.
Embodiment 14
Prescription is with embodiment 13
Each component in the table 3 is mixing even in banbury under 200 ℃ of temperature, through cooling, place it in after the pulverizing in the pressing mold, pressure 5Mpa is pressed into area 200cm under 180 ℃ of conditions of temperature
2, thick 0.1mm sheet material (B)
Each component in the table 4 is mixing even in banbury under 160 ℃ of temperature, through cooling, place it in after the pulverizing in the pressing mold, pressure 5Mpa is pressed into area 200cm under 160 ℃ of conditions of temperature
2, thick 0.2mm sheet material (A)
Sheet material (A) and sheet material (B) are stacked according to (B)-(A)-(B) order, and in pressing mold, pressure 5Mpa is pressed into thick 0.35mm, area 200cm under 160 ℃ of the temperature
2Composite core material.
Nickel sheet behind the surface coarsening after smooth, at pressure 5Mpa, is hot-pressed onto the two-sided of core under 160 ℃ of conditions of temperature, and 85 ℃ of heat treatments are after 8 hours, with gamma-rays (Co in vacuum drying oven
60) irradiation, dosage is 20Mrad, strikes out the little garden sheet of Φ 9.0mm then on punch press, the tin-coated copper lead-in wire of the Φ 0.6mm that burn-ons respectively on the two sides again, and then seal material package with epoxy and seal, obtain and implement the similar product of 13 electrical properties.
Embodiment 15
Prescription is with embodiment 13
Each component in the table 3 is mixing even in banbury under 200 ℃ of temperature, through cooling, place it in after the pulverizing in the pressing mold, pressure 5Mpa is pressed into area 200cm under 180 ℃ of conditions of temperature
2, thick 0.2mm sheet material (B)
Each component in the table 4 is mixing even in banbury under 160 ℃ of temperature, through cooling, place it in after the pulverizing in the pressing mold, pressure 5Mpa is pressed into area 200cm under 160 ℃ of conditions of temperature
2, thick 0.1mm sheet material (A)
Sheet material (A) and sheet material (B) are stacked according to (A)-(B)-(A) order, and in pressing mold, pressure 5Mpa is pressed into thick 0.35mm, area 200cm under 160 ℃ of the temperature
2Composite core material.
Nickel sheet behind the surface coarsening after smooth, at pressure 5Mpa, is hot-pressed onto the two-sided of core under 160 ℃ of conditions of temperature, and 85 ℃ of heat treatments are after 8 hours, with gamma-rays (Co in vacuum drying oven
60) irradiation, dosage is 20Mrad, strikes out the little garden sheet of Φ 9.0mm then on punch press, the tin-coated copper lead-in wire of the Φ 0.6mm that burn-ons respectively on the two sides again, and then seal material package with epoxy and seal, obtain and implement the similar product of 13 electrical properties.
Embodiment 16～18
Radiation mode changes electron beam irradiation into, and irradiation dose is identical with embodiment 13～15 respectively with other conditions, can obtain 13～15 similar products with embodiment respectively.
Embodiment 19～24
The preparation of core is used extruder instead and is extruded, and the control of each section of extruder temperature is set at respectively:
130 ℃ 140 ℃ 150 ℃ 160 ℃ of sheet materials (A)
150 ℃ 160 ℃ 170 ℃ 180 ℃ of sheet materials (B)
The melt of extruding is finalized the design with calender, cuts into the sheet material of certain size after the cooling again, and other conditions are identical with embodiment 13～18 respectively, obtains the product similar to embodiment 13～18 respectively.
Claims (6)
1. thermistor, it by core and be covered on this core two sides tinsel, be welded on this tinsel outer surface stratiform or the lead-in wire shape extraction electrode and be coated on the outside insulating barrier constitute, it is characterized in that, described core is composited by the high molecular PTC material layer (B) of high molecular PTC material layer (A) that has low thermal transition temperature respectively and high ptc characteristics, its composite bed is at least two-layer, and described core prescription is as follows:
(1) the high molecular PTC material layer (A) of low thermal transition temperature: the high molecular polymer percetage by weight is 40%～60%, conductive filler percetage by weight 30%～59%, inorganic filler percetage by weight 0%～20%, processing aid percetage by weight 0.599%～5%; Described high molecular polymer is made up of the blend of wherein a kind of of following high molecular polymer or two kinds of polymer wherein, and these polymer are ethene-vinyl acetate co-polymer, ethene-acrylate copolymer; Described conductive filler is made up of wherein a kind of of following material or wherein two kinds or two or more material blends wherein, and these materials are carbon black, carbon fiber, metal dust, metal oxide; Described inorganic filler is the inorganic matter of particle diameter＜50 μ m, comprises magnesium oxide, aluminium oxide, silicon dioxide, potter's clay, talcum powder, calcium carbonate, magnesium hydroxide, aluminium hydroxide; Described processing aid is meant antioxidant, crosslinking accelerator, coupling agent, wherein antioxidant is phenols or aminated compounds, and crosslinking accelerator is the polyfunctional group unsaturated compound, and coupling agent is silane or titanate ester compound.
(2) the high molecular PTC material layer (B) of high ptc characteristics: the high molecular polymer percetage by weight is 40%-60%, the conductive filler percetage by weight is 30%-59%, the inorganic filler percetage by weight is 0%-20%, and the processing aid percetage by weight is 0.599%-5%; Described high molecular polymer is made up of the blend of wherein a kind of of following high molecular polymer or two kinds of polymer wherein, and these polymer are polyethylene, polypropylene, poly-1-butylene, Kynoar, polytrifluorochloroethylene, nylon, poly terephthalic acid diethylester, polybutyl terapthalate; Described conductive filler is made up of wherein a kind of of following material or wherein two kinds or two or more material blends wherein, and these materials are carbon black, graphite, carbon fiber, metal dust, metal oxide; Described inorganic filler is the inorganic matter of particle diameter＜50 μ m, comprises magnesium oxide, aluminium oxide, silicon dioxide, potter's clay, talcum powder, calcium carbonate, magnesium hydroxide, aluminium hydroxide; Described processing aid is meant antioxidant, crosslinking accelerator, coupling agent, and wherein antioxidant is phenols or aminated compounds, and crosslinking accelerator is the polyfunctional group unsaturated compound, and coupling agent is silane or titanate ester compound.
2. thermistor according to claim 1 is characterized in that, described composite bed is two-layer, respectively is up and down material layer (A) and material layer (B).
3. thermistor according to claim 1 is characterized in that, described composite bed is three layers, and the centre is material layer (B), respectively is up and down material layer (A).
4. thermistor according to claim 1 is characterized in that, described composite bed is three layers, and the centre is material layer (A), respectively is up and down material layer (B).
5. the manufacture method of a thermistor, it is characterized in that, at first prepare burden by following prescription: the high molecular PTC material layer (A) of low thermal transition temperature: the high molecular polymer percetage by weight is 40%～60%, conductive filler percetage by weight 30%～59%, inorganic filler percetage by weight 0%～20%, processing aid percetage by weight 0.599%～5%; Described high molecular polymer is made up of the blend of wherein a kind of of following high molecular polymer or two kinds of polymer wherein, and these polymer are ethene-vinyl acetate co-polymer, ethene-acrylate copolymer; Described conductive filler is made up of wherein a kind of of following material or wherein two kinds or two or more material blends wherein, and these materials are carbon black, carbon fiber, metal dust, metal oxide; Described inorganic filler is the inorganic matter of particle diameter＜50 μ m, comprises magnesium oxide, aluminium oxide, silicon dioxide, potter's clay, talcum powder, calcium carbonate, magnesium hydroxide, aluminium hydroxide; Described processing aid is meant antioxidant, crosslinking accelerator, coupling agent, wherein antioxidant is phenols or aminated compounds, and crosslinking accelerator is the polyfunctional group unsaturated compound, and coupling agent is silane or titanate ester compound; High molecular PTC material layer (B) with high ptc characteristics: the high molecular polymer percetage by weight is 40%-60%, the conductive filler percetage by weight is 30%-59%, the inorganic filler percetage by weight is 0%-20%, and the processing aid percetage by weight is 0.599%-5%; Described high molecular polymer is made up of the blend of wherein a kind of of following high molecular polymer or two kinds of polymer wherein, and these polymer are polyethylene, polypropylene, poly-1-butylene, Kynoar, polytrifluorochloroethylene, nylon, poly terephthalic acid diethylester, polybutyl terapthalate; Described conductive filler is made up of wherein a kind of of following material or wherein two kinds or two or more material blends wherein, and these materials are carbon black, graphite, carbon fiber, metal dust, metal oxide; Described inorganic filler is the inorganic matter of particle diameter＜50 μ m, comprises magnesium oxide, aluminium oxide, silicon dioxide, potter's clay, talcum powder, calcium carbonate, magnesium hydroxide, aluminium hydroxide; Described processing aid is meant antioxidant, crosslinking accelerator, coupling agent, and wherein antioxidant is phenols or aminated compounds, and crosslinking accelerator is the polyfunctional group unsaturated compound, and coupling agent is silane or titanate ester compound; Respectively that high molecular polymer, conductive filler, inorganic filler and the processing aid of core component (A), (B) is mixing under 100-200 ℃ of temperature then, making area with mold pressing or the method extruded is 100-1000cm
2, the material layer of thick 0.1-1.0mm (A) sheet material and material layer (B) sheet material; The method that reusable heat is pressed is carried out high molecular PTC material layer (B) sheet material of the high molecular PTC material layer (A) of low thermal transition temperature and high ptc characteristics compound, makes core; On hot press, tinsel is compound in two surfaces of described core, makes composite sheet, again with this composite sheet gamma-rays (Co
60) or electron beam to irradiate crosslinked, dosage is 5-100Mrad, and then composite sheet is slit into the small pieces of certain size, sheet or lead-in wire shape metal electrode in the welding, and the outside behind the coated insulation layer, promptly obtains the polymer thermistor device again.
6. the manufacture method of a thermistor, it is characterized in that, at first prepare burden by following prescription: the high molecular PTC material layer (A) of low thermal transition temperature: the high molecular polymer percetage by weight is 40%～60%, conductive filler percetage by weight 30%～59%, inorganic filler percetage by weight 0%～20%, processing aid percetage by weight 0.599%～5%; Described high molecular polymer is made up of the blend of wherein a kind of of following high molecular polymer or two kinds of polymer wherein, and these polymer are ethene-vinyl acetate co-polymer, ethene-acrylate copolymer; Described conductive filler is made up of wherein a kind of of following material or wherein two kinds or two or more material blends wherein, and these materials are carbon black, carbon fiber, metal dust, metal oxide; Described inorganic filler is the inorganic matter of particle diameter＜50 μ m, comprises magnesium oxide, aluminium oxide, silicon dioxide, potter's clay, talcum powder, calcium carbonate, magnesium hydroxide, aluminium hydroxide; Described processing aid is meant antioxidant, crosslinking accelerator, coupling agent, wherein antioxidant is phenols or aminated compounds, and crosslinking accelerator is the polyfunctional group unsaturated compound, and coupling agent is silane or titanate ester compound; High molecular PTC material layer (B) with high ptc characteristics: the high molecular polymer percetage by weight is 40%-60%, the conductive filler percetage by weight is 30%-59%, the inorganic filler percetage by weight is 0%-20%, and the processing aid percetage by weight is 0.599%-5%; Described high molecular polymer is made up of the blend of wherein a kind of of following high molecular polymer or two kinds of polymer wherein, and these polymer are polyethylene, polypropylene, poly-1-butylene, Kynoar, polytrifluorochloroethylene, nylon, poly terephthalic acid diethylester, polybutyl terapthalate; Described conductive filler is made up of wherein a kind of of following material or wherein two kinds or two or more material blends wherein, and these materials are carbon black, graphite, carbon fiber, metal dust, metal oxide; Described inorganic filler is the inorganic matter of particle diameter＜50 μ m, comprises magnesium oxide, aluminium oxide, silicon dioxide, potter's clay, talcum powder, calcium carbonate, magnesium hydroxide, aluminium hydroxide; Described processing aid is meant antioxidant, crosslinking accelerator, coupling agent, and wherein antioxidant is phenols or aminated compounds, and crosslinking accelerator is the polyfunctional group unsaturated compound, and coupling agent is silane or titanate ester compound; Respectively that high molecular polymer, conductive filler, inorganic filler and the processing aid of core component (A), (B) is mixing under 100-200 ℃ of temperature then, making area with mold pressing or the method extruded is 100-1000cm
2, the material layer of thick 0.1-1.0mm (A) sheet material and material layer (B) sheet material; The method that reusable heat is pressed is carried out high molecular PTC material layer (B) sheet material of the high molecular PTC material layer (A) of low thermal transition temperature and high ptc characteristics compound, makes core; Again with this core gamma-rays (Co
60) or crosslinking electron beam irradiation, dosage is 5-100Mrad, on hot press, tinsel is compound in two surfaces of described core then, make composite sheet, again this composite sheet is slit into the small pieces of certain size, sheet or lead-in wire shape metal electrode in the welding, outside behind the coated insulation layer, promptly obtain the polymer thermistor device again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99124219 CN1111310C (en) | 1999-12-06 | 1999-12-06 | Thermosensitive resistor and its manufacture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99124219 CN1111310C (en) | 1999-12-06 | 1999-12-06 | Thermosensitive resistor and its manufacture |
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| Publication Number | Publication Date |
|---|---|
| CN1256499A CN1256499A (en) | 2000-06-14 |
| CN1111310C true CN1111310C (en) | 2003-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 99124219 Expired - Fee Related CN1111310C (en) | 1999-12-06 | 1999-12-06 | Thermosensitive resistor and its manufacture |
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1999
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