CN103730220A - Preparation method of PPTC (Polymeric Positive Temperature Coefficient) thermistor with high electrode peeling strength and uniform resistance distribution - Google Patents
Preparation method of PPTC (Polymeric Positive Temperature Coefficient) thermistor with high electrode peeling strength and uniform resistance distribution Download PDFInfo
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Abstract
The invention discloses a preparation method of a PPTC (Polymeric Positive Temperature Coefficient) thermistor. The preparation method achieves continuous extrusion calendaring molding of the PPTC thermistor by selecting a specific technology. The preparation method provided by the invention is better in stability and high in efficiency, and the surface of a prepared macromolecule plate electrode is free from phenomena of pocking marks and bubbles; the resistance of the thermistor is good in uniformity, the electrode peeling strength is high, the inoxidizability is excellent, the resistance change rate during a durability test is small, the weather resistance is good, the product yield is higher, with the adoption of the preparation method, materials are saved, manual and energy source costs are reduced, and the preparation method has an important industrial application value.
Description
Technical field
The present invention relates to macromolecular thermosensitive resistor field, relate in particular to the preparation method of the PPTC thermistor that distribution of resistance that a kind of stripping electrode intensity is high is consistent.
Technical background
Macromolecular positive temperature coefficient thermosensitive resistor (PPTC, Polymer Positive Temperature Coefficient thermistor) claim again resettable fuse, be called for short PPTC thermistor, PPTC thermistor is the resistance that a kind of typical case has temperature sensitivity, while surpassing certain temperature (switch temperature), its resistance value is along with the rising of temperature is increasing of step evolution.Its operation principle is: when circuit is normally worked, the very little electric current that do not hinder of PPTC thermistor resistance passes through; And when overcurrent, overload or the fault such as overheated appear in circuit, thermistor temp rises rapidly, while surpassing switch temperature, moment rises to high-impedance state, thereby limiting circuit electric current is to very low level protective circuit in time; After fault is got rid of, PPTC thermistor is cooling and return to former low resistive state rapidly, circuit recover normal after this thermistor can again reuse.
The main feature of PPTC thermistor is highly sensitive, and volume is little, easy to use, is easy to the feature of processing and good stability, and it has been widely used in the circuit protection in the industrial fields such as computer, communication, consumer electronics, automobile, path, digital content.
The common alligatoring Copper Foil of the many employings of PPTC thermistor under existing technology is produced by tablet press machine process for pressing, copper foil surface alligatoring face shape is unfavorable for adhering to, roughness is inadequate, directly affect the form of nickel coating, when the macromolecule temperature coefficient thermistor and the bond strength of high molecular polymer inadequate, cause its serviceability not up to standard, cause existing combined strength bination be lowly that peeling force is little, non-oxidizability is poor, can not long-term storage, distribution of resistance is discrete, the shortcoming that rate of finished products is lower; And thermistor chip after long-term storage, easily occur resistance unstable, be again prone to the chip phenomenons such as electrode comes off of bubbling even after welding, bring inconvenience to actual application.
Summary of the invention
The object of the invention is to the problem for above-mentioned existence, the preparation method of the PPTC thermistor that distribution of resistance that a kind of stripping electrode intensity is high is consistent has been proposed, to solve PPTC thermistor in prior art, have that stripping electrode power is little, non-oxidizability is poor, can not long-term storage, distribution of resistance is discrete and rate of finished products is lower shortcoming.
To achieve these goals and other objects, the present invention is achieved by the following technical solutions:
A preparation method for the macromolecular PTC thermistor that distribution of resistance that stripping electrode intensity is high is consistent, comprises the following steps:
1) base material treatment: base material batching, pulverizing, mix;
2) double screw extruder is extruded: after mixing in step 1), base material vacuumizes and extrudes through double screw extruder; The extrusion temperature of double screw extruder is 180～220 ℃;
3) extrusion calendaring: calendering obtains sheet forming on calender after single screw extrusion machine is extruded, described sheet forming is by wrap-up automatic winding; During calendering, select mushroom alligatoring face or dendroid alligatoring face nickel plating Copper Foil as electrode, described electrode unreels automatically by unwinding device, when single screw extrusion machine is extruded, head temperature is 180～220 ℃, and during calendering, the roller temperature of cylinder calender is 150-210 ℃;
4) die-cut: after sheet forming is cooling, to carry out die-cut;
5) heat treatment: heat-treat at 140-190 ℃;
6) cross-linking radiation: with cobalt source or electron beam to irradiate crosslinked, irradiation dose is 5-100Mrad;
7) heat treatment: heat-treat at 140-190 ℃.
According to above-mentioned steps disclosed by the invention, obtained the consistent macromolecular PTC thermistor of distribution of resistance that stripping electrode intensity of the present invention is high.
Preferably, in the present invention double screw extruder extrusion temperature than the high 40-80 ℃ of raw material fusing point.
The present invention selects nickel plating Copper Foil, has more non-oxidizability, makes macromolecular PTC thermistor resting period of making longer.
Preferably, the thickness of nickel plating Copper Foil of the present invention is 25-100um;
Preferably, the nickel coating thickness of nickel plating Copper Foil of the present invention is 5-10um;
Preferably, the width of nickel plating Copper Foil of the present invention can be 50-500mm;
Preferably, described when calendering calender roller temperature be 155-180 ℃;
Preferably, in step 3), by regulating the discharging sheet material THICKNESS CONTROL calendering aftershaping sheet metal thickness size of single screw extrusion machine head mouth, make the gauge of head mouth discharging sheet material of single screw extrusion machine compared with the thick 2.0-6.0mm of sheet forming gauge.Preferably, the gauge of single screw extrusion machine head mouth discharging sheet material is compared with the thick 2.0-5.0mm of the gauge of sheet forming.
Preferably, in step 3), the extrusion temperature of single screw extrusion machine is 180～200 ℃.
Preferably, the diameter of the pressure roller of calender described in step 3) is 200-800mm, and length is 200-800mm.
Preferably, above-mentioned steps 3) described in calender be selected from a kind of in two roll calender, tri-roll press machine, four-roll calender and five roll calendars.
Preferably, in step 5) and step 7), heat treatment temperature is high 30～60 ℃ compared with base material melting temperature.
Preferably, the irradiation dose in step 6) is 5-20Mrad.
More preferably, the irradiation dose in step 6) is 10-20Mrad.
The invention also discloses the consistent PPTC thermistor of distribution of resistance that a kind of stripping electrode intensity being obtained by above-mentioned preparation method is high.
It is Jeonyoung Electrochemical Co. that the present invention selects mushroom alligatoring face nickel plating Copper Foil, the HP-200 model that Ltd produces, its surface topography as shown in Figure 1, its microcosmic surface is area increased obviously, increase surface roughness simultaneously, when boning with macromolecular material, macromolecular material can be embedded in the depression position at mushroom edge, peeling off Shi Gengnan extracts, simultaneously bi-material binding site area obviously increases, and reduces contact resistance when can greatly improve the adhesion strength with macromolecular material.
It is the C-110 that Feitian company produces that the present invention selects dendroid alligatoring face nickel plating Copper Foil, its surface topography as shown in Figure 2, its microcosmic surface is area increased obviously, increase surface roughness simultaneously, when boning with macromolecular material, macromolecular material can be embedded in concavo-convex sunken position, branch edge deeply, while peeling off, is not drawn out easily, and can greatly improve the adhesion strength with macromolecular material.
Step 2 of the present invention) in, adopt the strong shearing force of twin-screw to be more conducive to material plasticizing, employing vacuumizes the discharge that is more conducive to air in material, aqueous vapor, while guaranteeing calendering, do not occur bubble, pit phenomenon, assurance nickel-clad copper foil electrode is combined more firm with macromolecular material.
The preparation method of the PPTC thermistor that distribution of resistance that stripping electrode intensity disclosed by the invention is high is consistent is applicable to prepare the PPTC thermistor that following plurality of raw materials is made, and described PPTC thermistor comprises base material and is compound in the nickel plating Copper Foil on this base material two sides.Described base material is comprised of macromolecule resin and packing material.Described macromolecule resin is selected from polyethylene, ethylene-methyl acrylate copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, polypropylene, polybutene, Kynoar, polytrifluorochloroethylene, nylon, polyvinyl chloride, one or more in phenolic resins, epoxy resin, polyimide resin, polyflon, bismaleimide-triazine resin, thermosetting polyphenylene ether resin and mylar.Described packing material is selected from one or more in glass fabric, aramid fiber non woven fabric, carbon black, nickel powder, magnesium hydroxide, aluminium hydroxide, kaolin, white carbon, calcium carbonate and titanium dioxide.
The PPTC thermistor obtaining by the above-mentioned disclosed preparation method of the present invention can be assembled according to customer demand model in actual applications, does not need in the art completed knocked down products to have: annular nude film class, circular nude film class, square nude film class; Need completed knocked down products to have: radially copper (steel) line draw do not seal class, radially copper (steel) line draw seal class, nickel (steel nickel plating) electrode is laterally drawn class, SMD patch type, metal patch class).
In addition, after general assembled formation, do not need heat treatment, only radially copper (steel) line is drawn and is sealed class and when operation is solidified, need heat treatment again sealing.
The preparation method of the PPTC thermistor that distribution of resistance that preferably, in the present invention, disclosed stripping electrode intensity is high is consistent also comprises assembled formation step.Thermistor in the present invention can carry out assembled formation according to method in routine techniques according to actual process and product requirement.
In the prior art, in design with while producing thermistor, be all generally to adjust resistance that composition and engineering makes to obtain can meet and reach specific resistance value and the performance requirement of the maximum current that can bear and maximum voltage value etc.
The preparation method of the PPTC thermistor that distribution of resistance that preferably, in the present invention, disclosed stripping electrode intensity is high is consistent also comprises the aging step of surge: the aging step of described surge is that the maximum voltage that requires with the thermistor that above-mentioned technique makes and maximum current are to its energising 3～45S.
Whether the thermistor of not only can inspection institute preparing by the aging step process of surge meets resistive performance designing requirement, meet practical application, and can make the molecules align of the polymer in thermistor that in the present invention prepared by method more stable and permanent, thereby further improve the combination property of thermistor.
To sum up, the preparation method of the PPTC thermistor that distribution of resistance that in the present invention, disclosed stripping electrode intensity is high is consistent is by selecting specific technique to realize the continuous extrusion calendaring moulding of PPTC thermistor, this preparation method's stability is better, efficiency is high, and the macromolecule sheet material electrode surface preparing is without pit bubble phenomenon; The resistance high conformity of thermistor, stripping electrode power is high, non-oxidizability is good, it is little to carry out durable test resistance change rate, good weatherability, and rate of finished products is higher, and use this preparation method to save the costs such as material, the artificial and energy, there is important industrial application value.
accompanying drawing explanation
Fig. 1 is the surperficial Electronic Speculum figure of the thick picture nickel plating of mushroom Copper Foil;
Fig. 2 is the surperficial Electronic Speculum figure of dendroid alligatoring face nickel plating Copper Foil.
embodiment
Below, by specific instantiation explanation embodiments of the present invention, those skilled in the art can understand other advantage of the present invention and effect easily by the disclosed content of this specification.The present invention can also be implemented or be applied by other different embodiment, and the every details in this specification also can be based on different viewpoints and application, carries out various modifications or change not deviating under spirit of the present invention.
Embodiment 1
In the present embodiment, base material is: high density polyethylene (HDPE) 4400g, carbon black 4000g, magnesium hydroxide 4200g.
Processing step concrete in the present embodiment is:
1) base material treatment: carry out base material batching, then base material poured in mixer and mixed according to said components;
2) double screw extruder is extruded: after mixing in step 1), base material vacuumizes and extrudes through double screw extruder; Two spiral shells
The extrusion temperature of bar extruder is 190～200 ℃;
3) extrusion calendaring: through single screw extrusion machine 190-195 ℃ extrude after on calender calendering obtain sheet forming, described sheet forming is by wrap-up automatic winding; During calendering, select the thick picture nickel plating of the wide mushroom of 110mm Copper Foil as electrode, described electrode unreels automatically by the unwinding device of belt tension, and when single screw extrusion machine is extruded, head temperature is 180～220 ℃, and during calendering, the roller temperature of cylinder calender is 160 ℃; The head width 100mm of described single screw extrusion machine, head discharge hole for discharge sheet metal thickness 5.0mm, the THICKNESS CONTROL of described sheet forming is at 1.96-2.00mm;
4) die-cut: after sheet forming is cooling, to carry out die-cutly, cut into 5.5mm * 5.5mm chip;
5) heat treatment: heat-treat at 155 ℃ 1 hour;
6) cross-linking radiation: with cobalt source or electron beam to irradiate crosslinked, irradiation dose is 15Mrad;
7) heat treatment: heat-treat at 155 ℃ 1 hour;
8) surge is aging: aging with 220V/3A/15S surge.
The thick picture nickel plating of mushroom described in the present embodiment Copper Foil is Jeonyoung Electrochemical Co., the HP-200 that Ltd produces, and its surface picture is as shown in Figure 1.
According to GB GB/T2791-1995 method, carry out peel strength test, according to GB/T7153-2002 method, carry out resistance test, according to the GB/T7153-2002 standard testing rate of change of resistance to leakage resistance; According to withstand voltage 48 hours resistance change rates of GB/T7153-2002 standard testing 250V, and place 1000 hours resistance change rates according to 40 ℃ of 95% humidity of GB/T7153-2002 standard testing, acquisition the results are shown in Table 1.
Embodiment 2
In the present embodiment, base material is: high density polyethylene (HDPE) 4400g, carbon black 4000g, magnesium hydroxide 4200g.
Processing step concrete in the present embodiment is:
1) base material treatment: carry out base material batching, then base material poured in mixer and mixed according to said components;
2) double screw extruder is extruded: after mixing in step 1), base material vacuumizes and extrudes through double screw extruder; The extrusion temperature of double screw extruder is 190～200 ℃;
3) extrusion calendaring: through single screw extrusion machine 190-195 ℃ extrude after on calender calendering obtain sheet forming, described sheet forming is by wrap-up automatic winding; During calendering, select the wide dendroid nickel plating of 110mm Copper Foil as electrode, described electrode unreels automatically by the unwinding device of belt tension, and when single screw extrusion machine is extruded, head temperature is 180～220 ℃, and during calendering, the roller temperature of cylinder calender is 160 ℃; The head width 100mm of described single screw extrusion machine, head discharge hole for discharge sheet metal thickness 5.0mm, the THICKNESS CONTROL of described sheet forming is at 1.96-2.00mm;
4) die-cut: after sheet forming is cooling, to carry out die-cutly, cut into 5.5mm * 5.5mm chip;
5) heat treatment: heat-treat at 155 ℃ 1 hour;
6) cross-linking radiation: with cobalt source or electron beam to irradiate crosslinked, irradiation dose is 15Mrad;
7) heat treatment: heat-treat at 155 ℃ 1 hour;
8) surge is aging: 220V/3A/15S surge is aging.
The thick picture nickel plating of dendroid described in the present embodiment Copper Foil is the C-110 that Feitian company produces, and its surface picture as shown in Figure 2.
According to GB GB/T2791-1995 method, carry out peel strength test, according to GB/T7153-2002 method, carry out resistance test, according to the GB/T7153-2002 standard testing rate of change of resistance to leakage resistance; According to withstand voltage 48 hours resistance change rates of GB/T7153-2002 standard testing 250V, and place 1000 hours resistance change rates according to 40 ℃ of 95% humidity of GB/T7153-2002 standard testing, acquisition the results are shown in Table 1.
Embodiment 3
The present embodiment is the check experiment of embodiment 1 and 2, in the situation that other process conditions are constant, do not adopt vacuum extruding and adopt common alligatoring Copper Foil as electrode when double screw extruder is extruded, and obtains final macromolecular PTC thermistor.Described common alligatoring Copper Foil is selected from the alligatoring Copper Foil of the 35um thickness of Shanghai treasure.
In the present embodiment, base material is: high density polyethylene (HDPE) 4400g, carbon black 4000g, magnesium hydroxide 4200g.
Processing step concrete in the present embodiment is:
1) base material treatment: carry out base material batching, then base material poured in mixer and mixed according to said components;
2) double screw extruder is extruded: after mixing in step 1), base material is extruded through double screw extruder; The extrusion temperature of double screw extruder is 190～200 ℃;
3) extrusion calendaring: through single screw extrusion machine 190-195 ℃ extrude after on calender calendering obtain sheet forming, described discharging sheet material is by wrap-up automatic winding; During calendering, select the wide common alligatoring Copper Foil of 110mm as electrode, described electrode unreels automatically by unwinding device, and when single screw extrusion machine is extruded, head temperature is 180～220 ℃, and during calendering, the roller temperature of cylinder calender is 160 ℃; The head width 100mm of described single screw extrusion machine, the discharging sheet metal thickness 5.0mm of head discharging, the THICKNESS CONTROL of described sheet forming is at 1.96-2.00mm;
4) die-cut: after sheet forming is cooling, to carry out die-cutly, cut into 5.5mm * 5.5mm chip;
5) heat treatment: heat-treat at 155 ℃ 1 hour;
6) cross-linking radiation: with cobalt source or electron beam to irradiate crosslinked, irradiation dose is 15Mrad;
7) heat treatment: heat-treat at 155 ℃ 1 hour;
8) surge is aging: 220V/3A/15S surge is aging.
According to GB GB/T2791-1995 method, carry out peel strength test, according to GB/T7153-2002 method, carry out resistance test, according to the GB/T7153-2002 standard testing rate of change of resistance to leakage resistance; According to withstand voltage 48 hours resistance change rates of GB/T7153-2002 standard testing 250V, and place 1000 hours resistance change rates according to 40 ℃ of 95% humidity of GB/T7153-2002 standard testing, acquisition the results are shown in Table 1.
Embodiment 4
In the present embodiment, adopt as the twin-screw vacuum extruding technique in embodiment 1 and embodiment 2, but electrode is selected the wide common alligatoring Copper Foil of 110mm, when double screw extruder is extruded, adopt to vacuumize and extrude, the head discharging sheet metal thickness of described double screw extruder is 8.0mm, obtains final macromolecular PTC thermistor.Described common alligatoring Copper Foil is selected from the alligatoring Copper Foil of the 35um thickness of Shanghai treasure.
In the present embodiment, base material is: high density polyethylene (HDPE) 4400g, carbon black 4000g, magnesium hydroxide 4200g.
Processing step concrete in the present embodiment is:
1) base material treatment: carry out base material batching, then base material poured in mixer and mixed according to said components;
2) double screw extruder is extruded: after mixing in step 1), base material vacuumizes and extrudes through double screw extruder; The extrusion temperature of double screw extruder is 190～200 ℃;
3) extrusion calendaring: through single screw extrusion machine 190-195 ℃ extrude after on calender calendering obtain discharging sheet material, described discharging sheet material is by wrap-up automatic winding; During calendering, select the wide common alligatoring Copper Foil of 110mm as electrode, described electrode unreels automatically by the unwinding device of belt tension, and when single screw extrusion machine is extruded, head temperature is 180～220 ℃, and during calendering, the roller temperature of cylinder calender is 160 ℃; The head width 100mm of described single screw extrusion machine, head discharge hole for discharge sheet metal thickness 8.0mm, the THICKNESS CONTROL of described sheet forming is at 1.96-2.00mm;
4) die-cut: after sheet forming is cooling, to carry out die-cutly, cut into 5.5mm * 5.5mm chip;
5) heat treatment: heat-treat at 155 ℃ 1 hour;
6) cross-linking radiation: with cobalt source or electron beam to irradiate crosslinked, irradiation dose is 15Mrad;
7) heat treatment: heat-treat at 155 ℃ 1 hour;
8) surge is aging: 220V/3A/15S surge is aging.
According to GB GB/T2791-1995 method, carry out peel strength test, according to GB/T7153-2002 method, carry out resistance test, according to the GB/T7153-2002 standard testing rate of change of resistance to leakage resistance; According to withstand voltage 48 hours resistance change rates of GB/T7153-2002 standard testing 250V, and place 1000 hours resistance change rates according to 40 ℃ of 95% humidity of GB/T7153-2002 standard testing, acquisition the results are shown in Table 1.
Embodiment 5
In the present embodiment, adopt as the twin-screw vacuum extruding technique in embodiment 1 and embodiment 2, but electrode is selected the wide common alligatoring Copper Foil of 110mm, during twin-screw extrusion, do not adopt vacuum extruding, the head discharging opening thickness of described double screw extruder is 3.0mm, obtains final macromolecular PTC thermistor.Described common alligatoring Copper Foil is selected from the alligatoring Copper Foil of the 35um thickness of Shanghai treasure.
In the present embodiment, base material is: high density polyethylene (HDPE) 4400g, carbon black 4000g, magnesium hydroxide 4200g.
Processing step concrete in the present embodiment is:
1) base material treatment: carry out base material batching, then base material poured in mixer and mixed according to said components;
2) double screw extruder is extruded: after mixing in step 1), base material is extruded through double screw extruder; The extrusion temperature of double screw extruder is 190～200 ℃;
3) extrusion calendaring: through single screw extrusion machine 190-195 ℃ extrude after on calender calendering obtain sheet forming, described sheet forming is by wrap-up automatic winding; During calendering, select the wide common alligatoring Copper Foil of 110mm as electrode, described electrode unreels automatically by the unwinding device of belt tension, and when single screw extrusion machine is extruded, head temperature is 180～220 ℃, and during calendering, the roller temperature of cylinder calender is 160 ℃; The head width 100mm of described single screw extrusion machine, head discharge hole for discharge sheet metal thickness 3.0mm, the THICKNESS CONTROL of described sheet forming is at 1.96-2.00mm;
4) die-cut: after sheet forming is cooling, to carry out die-cutly, cut into 5.5mm * 5.5mm chip;
5) heat treatment: heat-treat at 155 ℃ 1 hour;
6) cross-linking radiation: with cobalt source or electron beam to irradiate crosslinked, irradiation dose is 15Mrad;
7) heat treatment: heat-treat at 155 ℃ 1 hour;
8) surge is aging: 220V/3A/15S surge is aging.
According to GB GB/T2791-1995 method, carry out peel strength test, according to GB/T7153-2002 method, carry out resistance test, according to the GB/T7153-2002 standard testing rate of change of resistance to leakage resistance; According to withstand voltage 48 hours resistance change rates of GB/T7153-2002 standard testing 250V, and place 1000 hours resistance change rates according to 40 ℃ of 95% humidity of GB/T7153-2002 standard testing, acquisition the results are shown in Table 1.
Embodiment 6
The present embodiment is in prior art, to prepare the technique of macromolecular PTC thermistor.
In the present embodiment, base material is: high density polyethylene (HDPE) 440g, carbon black 400g, magnesium hydroxide 420g.
In the present embodiment, technique is specially:
1) base material is poured in mixer and mixed, then by 180 ℃ of banburyings, pulverizing granulation;
2) then pass through twin-screw extruder pulling-on piece polymer base material 2.2～2.5mm;
3) then with the wide common alligatoring Copper Foil of 170 ℃ of compound 110mm of vulcanizing press, thickness 1.96～2.00mm.
4) be die-cut into 5.5mm * 5.5mm chip;
5) through 155 ℃ of heat treatments in 1 hour;
6) 15Mrad dosage cross-linking radiation;
7) 155 ℃ of heat treatments in 1 hour;
8) 220V/3A/15S surge is aging.。
According to GB GB/T2791-1995 method, carry out peel strength test, according to GB/T7153-2002 method, carry out resistance test, according to the GB/T7153-2002 standard testing rate of change of resistance to leakage resistance; According to withstand voltage 48 hours resistance change rates of GB/T7153-2002 standard testing 250V, and place 1000 hours resistance change rates according to 40 ℃ of 95% humidity of GB/T7153-2002 standard testing, acquisition the results are shown in Table 1.
Table 1
Embodiment 7
In the present embodiment, base material is: Kynoar 4000g, carbon black 1500g.
Processing step concrete in the present embodiment is:
3) base material treatment: carry out base material batching, then base material poured in mixer and mixed according to said components;
4) double screw extruder is extruded: after mixing in step 1), base material vacuumizes and extrudes through double screw extruder; The extrusion temperature of double screw extruder is 200～220 ℃;
5) extrusion calendaring: through single screw extrusion machine 195～210 ℃ extrude after on calender calendering obtain sheet forming, described sheet forming is by wrap-up automatic winding; During calendering, select the thick picture nickel plating of the wide mushroom of 110mm Copper Foil as electrode, described electrode unreels automatically by the unwinding device of belt tension, and during calendering, the roller temperature of cylinder calender is 200 ℃; The head width 100mm of described single screw extrusion machine, head discharge hole for discharge sheet metal thickness 3.0mm, calendering aftershaping sheet metal thickness is controlled at 0.52～0.55mm;
6) die-cut: after sheet forming is cooling, to carry out die-cutly, cut into 15.35mm * 11mm chip;
7) heat treatment: heat-treat at 190 ℃ 1 hour;
8) cross-linking radiation: with cobalt source or electron beam to irradiate crosslinked, irradiation dose is 20Mrad;
9) heat treatment: heat-treat at 140 ℃ 4 hours;
10) assembly welding: by reflow soldering, at two nickel-plated steel plate electrodes of the upper and lower assembly welding of chip;
11) surge is aging: with the aging 6S of DC15V50A surge.
The thick picture nickel plating of mushroom described in the present embodiment Copper Foil is Jeonyoung ElectrochemicalCo., the HP-200 that Ltd produces, and its surface picture is as shown in Figure 1.
According to GB GB/T2791-1995 method, carry out peel strength test, peel strength is 42N/cm, with reference to GB/T7153-2002 method, carry out resistance test, resistance is 125～140m Ω, 1000 resistance change rates of resistance to current test of DC16V50A energising are that 48 hours resistance change rates of 8%, DC16V50A energising are 48%; 40 ℃ of 95% humidity is placed 1000 hours resistance change rates 5%.
According to the preparation method of the present embodiment by selecting specific technique to realize the continuous extrusion calendaring moulding of macromolecular PTC thermistor, this preparation method's stability is better, efficiency is high, and the macromolecule sheet material electrode surface preparing is without pit bubble phenomenon; The resistance high conformity of thermistor, peeling force is high, non-oxidizability is good, it is little to carry out durable test resistance change rate, good weatherability, rate of finished products is higher, and uses this preparation method to save the costs such as material, the artificial and energy.
Embodiment 8
In the present embodiment, base material is: Kynoar 4000g, carbon black 1800g, aluminium hydroxide 300g.
Processing step concrete in the present embodiment is:
1) base material treatment: carry out base material batching, then base material poured in mixer and mixed according to said components;
2) double screw extruder is extruded: after mixing in step 1), base material vacuumizes and extrudes through double screw extruder; The extrusion temperature of double screw extruder is 200～220 ℃;
3) extrusion calendaring: through single screw extrusion machine 195-210 ℃ extrude after on calender calendering obtain sheet forming, described sheet forming is by wrap-up automatic winding; During calendering, select the thick picture nickel plating of the wide mushroom of 100mm Copper Foil as electrode, described electrode unreels automatically by the unwinding device of belt tension, and during calendering, the roller temperature of cylinder calender is 200 ℃; The head width 100mm of described single screw extrusion machine, head discharge hole for discharge sheet metal thickness 3.0mm, calendering formation aftershaping sheet metal thickness is controlled at 0.8～1.0mm;
4) die-cut: after sheet forming is cooling, to carry out die-cutly, cut into 14.85mm * 11.0mm chip;
5) heat treatment: heat-treat at 190 ℃ 1 hour;
6) cross-linking radiation: with cobalt source or electron beam to irradiate crosslinked, irradiation dose is 10Mrad;
7) heat treatment: heat-treat at 140 ℃ 4 hours;
8) assembling is sealed: the tinned wird of diameter phi 0.8 in the welding of product two ends, then at chip place, seal the epoxy resin of insulation, and by 160 ℃, within 1 hour, solidify.
9) surge is aging: with the aging 6S S of DC15V50A surge.
The thick picture nickel plating of mushroom described in the present embodiment Copper Foil is Jeonyoung Electrochemical Co., the HP-200 that Ltd produces, and its surface picture is as shown in Figure 1.
According to GB GB/T2791-1995 method, carry out peel strength test, peel strength is 45N/cm, with reference to GB/T7153-2002 method, carry out resistance test, resistance is 17～22m Ω, 1000 resistance change rates of resistance to current test of DC16V50A energising are that 48 hours resistance change rates of 5%, DC16V50A energising are 36%; 40 ℃ of 95% humidity is placed 1000 hours resistance change rates 9%.
According to the preparation method of the present embodiment by selecting specific technique to realize the continuous extrusion calendaring moulding of macromolecular PTC thermistor, this preparation method's stability is better, efficiency is high, and the macromolecule sheet material electrode surface preparing is without pit bubble phenomenon; The resistance high conformity of thermistor, peeling force is high, non-oxidizability is good, it is little to carry out durable test resistance change rate, good weatherability, rate of finished products is higher, and uses this preparation method to save the costs such as material, the artificial and energy.
Embodiment 9
In the present embodiment, base material is: bismaleimide-triazine resin 400g, high density polyethylene (HDPE) 1500g, titanium dioxide 1000g.
Processing step concrete in the present embodiment is:
1) base material treatment: carry out base material batching, then base material poured in mixer and mixed according to said components;
2) double screw extruder is extruded: after mixing in step 1), base material vacuumizes and extrudes through double screw extruder; The extrusion temperature of double screw extruder is 190～200 ℃;
3) extrusion calendaring: through single screw extrusion machine 190-195 ℃ extrude after on calender calendering obtain sheet forming, described sheet forming is by wrap-up automatic winding; During calendering, select the thick picture nickel plating of the wide dendroid of 110mm Copper Foil as electrode, described electrode unreels automatically by the unwinding device of belt tension, and during calendering, the roller temperature of cylinder calender is 185 ℃; The head width 100mm of described single screw extrusion machine, the thickness 3.0mm of head discharge hole for discharge sheet material, calendering formation aftershaping sheet metal thickness is controlled at 0.28～0.32mm;
4) die-cut: after sheet forming is cooling, to carry out die-cutly, cut into 3.0mm * 6.0mm chip;
5) heat treatment: heat-treat at 140 ℃ 1 hour;
6) cross-linking radiation: with cobalt source or electron beam to irradiate crosslinked, irradiation dose is 5Mrad;
7) heat treatment: heat-treat at 140 ℃ 1 hour;
8) assembly welding: the tinned wird of diameter phi 0.6 in the welding of product two sides
9) surge is aging: with the aging 10S of DC12V100A surge.
It is the C-110 that Feitian company produces that the present invention described in the present embodiment selects dendroid alligatoring face nickel plating Copper Foil, and its surface picture as shown in Figure 2.
According to GB GB/T2791-1995 method, carry out peel strength test, peel strength is 38N/cm, with reference to GB/T7153-2002 method, carry out resistance test, resistance is 12～15m Ω, 1000 resistance change rates of resistance to current test of DC12V100A energising are that 48 hours resistance change rates of 10%, DC16V50A energising are 58%; 40 ℃ of 95% humidity is placed 1000 hours resistance change rates 7%.
According to the preparation method of the present embodiment by selecting specific technique to realize the continuous extrusion calendaring moulding of macromolecular PTC thermistor, this preparation method's stability is better, efficiency is high, and the macromolecule sheet material electrode surface preparing is without pit bubble phenomenon; The resistance high conformity of thermistor, peeling force is high, non-oxidizability is good, it is little to carry out durable test resistance change rate, good weatherability, rate of finished products is higher, and uses this preparation method to save the costs such as material, the artificial and energy.
In sum, the preparation method of the PPTC thermistor that distribution of resistance that in the present invention, disclosed peel strength is high is consistent, overcome PPTC thermistor in prior art have that peeling force is little, non-oxidizability is poor, can not long-term storage, distribution of resistance is discrete and rate of finished products is lower shortcoming, preparation method's stability is better, efficiency is high, and the resistance high conformity of the thermistor preparing, carry out durable test resistance change rate little, good weatherability is used this preparation method to save the costs such as material, the artificial and energy simultaneously.So the present invention has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all can, under spirit of the present invention and category, modify or change above-described embodiment.Therefore, such as in affiliated technical field, have and conventionally know that the knowledgeable, not departing from all equivalence modifications that complete under disclosed spirit and technological thought or changing, must be contained by claim of the present invention.
Claims (10)
1. a preparation method for the PPTC thermistor that stripping electrode intensity is high distribution of resistance is consistent, comprises the following steps:
1) base material treatment: base material batching, pulverizing, mix;
2) double screw extruder is extruded: after mixing in step 1), base material vacuumizes and extrudes through double screw extruder; The extrusion temperature of double screw extruder is 180～220 ℃;
3) extrusion calendaring: calendering obtains sheet forming on calender after single screw extrusion machine is extruded, described sheet forming is by wrap-up automatic winding; During calendering, select mushroom alligatoring face or dendroid alligatoring face nickel plating Copper Foil as electrode, described electrode unreels automatically by unwinding device, when single screw extrusion machine is extruded, cross-head temperature is 180～220 ℃, and during calendering, the roller temperature of cylinder calender is 150-210 ℃;
4) die-cut: after sheet forming is cooling, to carry out die-cut cutting;
5) heat treatment: heat-treat at 140-190 ℃; ;
6) cross-linking radiation: with cobalt source or electron beam to irradiate crosslinked, irradiation dose is 5-100Mrad;
7) heat treatment: heat-treat at 140-190 ℃.
2. preparation method as claimed in claim 1, is characterized in that, the thickness 25-100um of the Copper Foil of nickel plating described in step 3), and the nickel coating thickness of described nickel plating Copper Foil is 5-10um.
3. preparation method as claimed in claim 1, is characterized in that, in step 3), the gauge of the head mouth discharging sheet material of single screw extrusion machine is compared with the thick 2.0-6.0mm of sheet forming gauge.
4. preparation method as claimed in claim 1, is characterized in that, in step 3), the width of nickel plating Copper Foil is 50-500mm.
5. preparation method as claimed in claim 1, is characterized in that, the roller temperature of calender is 155-180 ℃ described in step 3) when calendering.
6. preparation method as claimed in claim 1, is characterized in that, the diameter of the pressure roller of calender described in step 3) is 200-800mm, and length is 200-800mm.
7. preparation method as claimed in claim 1, is characterized in that, the calender described in step 3) is selected from a kind of in two roll calender, tri-roll press machine, four-roll calender and five roll calendars.
8. preparation method as claimed in claim 1, is characterized in that, in step 5) and step 7), heat treatment temperature is high 30～60 ℃ compared with base material melting temperature.
9. preparation method as claimed in claim 1, is characterized in that, the irradiation dose in step 6) is 5-30Mrad.
10. the high consistent PPTC thermistor of distribution of resistance of stripping electrode intensity that the preparation method as described in as arbitrary in claim 1-9 obtains.
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