CN105206361A - Thermistor core material and production technology thereof - Google Patents
Thermistor core material and production technology thereof Download PDFInfo
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- CN105206361A CN105206361A CN201410280855.4A CN201410280855A CN105206361A CN 105206361 A CN105206361 A CN 105206361A CN 201410280855 A CN201410280855 A CN 201410280855A CN 105206361 A CN105206361 A CN 105206361A
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- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims abstract description 14
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Abstract
The invention relates to the field of manufacturing materials of electron components, in particular to a kernel material of a novel voltage-withstanding overcurrent self-recovery protector, namely a core material manufacturing material, and the voltage-withstanding capacity can reach 600 V. The voltage-withstanding overcurrent self-recovery protector is composed of a core material arranged between two metal membranes, the metal membranes are provided with leading-out electrodes, and the outer layers of the metal membranes are enveloped with insulating and sealing materials. The core material is prepared from, by weight, high-density polyethylene, a conducting material, antioxidant 1010 and fire retardant prepared from magnesium hydrate. A novel thermistor kernel manufacturing material with good adhesive performance and the more remarkable jump performance can be provided, a thermistor has a positive temperature coefficient effect, the room temperature specific resistance is 10-2 Omega.cm, the PTC strength is larger than 107 orders of magnitude, and meanwhile a material manufacturing method is provided.
Description
Technical field
The present invention relates to electronic devices and components and make Material Field, particularly relate to the core material that a kind of voltage endurance capability can reach 600V Novel pressure-resistant type overcurrent self-recoverage protector, namely core makes material.
Background technology
It is boundless that PPTC overcurrent self-recoverage protector is applied in market prospects in circuit devcie protection, the application of product has household electrical appliances, motor, communication, security protection, toy etc., wherein communication, the market of machine field to be maximum be also forefront, its purposes proposes higher requirement to PPTC overcurrent self-recoverage protector protection components and parts, prevention communication, easily there is pyrophoricity accident being heated under high pressure-temperature or big current or short-circuit conditions in motor, therefore this Project Product is adopted to provide the protection of circuit overcurrent to it, ensure that electromechanical equipment work is smooth and easy and play good social benefit with personal security.Overcurrent self-recoverage protector be exploitation early, kind is many, development is more ripe sensitive components.Overcurrent self-recoverage protector is made up of conductive polymer composites, and the principle of utilization is that temperature causes resistance variations.When temperature is lower than Tc, the polarized charged moiety of negative electrical charge of grain boundaries is offset, and barrier height is significantly reduced, and crystal boundary is low resistive state; During higher than Tc, spontaneous polarization disappears, and the negative electrical charge of grain boundaries cannot obtain polarization charge potential barrier and be in a high position, and crystal boundary is high-impedance state.Material monolithic resistance sharply raises.The PTC overcurrent self-recoverage protector of differential responses can also be cascaded, and carries out the temperature protection of difference, can make such as like this: battery of mobile phone, the part such as electronics, electrical equipment plays the most excellent most economical protection in the different temperatures stage.But mainly there is following problem in the present situation of overcurrent self-recoverage protector now: the PTC overcurrent self-recoverage protector device principal item of over-current and-load protection has: ceramic flap-type, housing type, lock-in type and SMD etc.; China studies in this respect and starts late, technical matters level fall behind, no matter and be domestic and international, withstand voltage to product requirement, resistance to stream, volume are little, power becomes trend greatly.Along with the expansion of application, more and more higher to the performance requirement of polymer PTC overflow self-recoverage protector device, in GSM base station, interchange trunk, ADSL, SDH interface circuit, motor, in the aspects such as overcurrent protection, common pressure resistant type 250V Self-resetting protector is difficult to meet high voltage instructions for use, product pressure resistance must be improved, increasing it uses power to become pressing issues, if can the market demand be utilized, research and development department is organized to solve the problem of withstand voltage of raising 600V pressure resistant type self-recoverage overcurrent protector, not only can create huge economic benefit, also for the technological progress of society contributes.The chip of current production 250V Self-resetting overcurrent protector, adopts ordinary flat press to be difficult to meet manufacturing technique requirent, can not ensure that enough large pressure makes the black material of Copper Foil and chip bonding firmly.Its key problem is exactly that the core performance making thermistor is difficult to meet the requirement used, and limits the performance of thermistor and the development of a lot of relevant industries so far.
Summary of the invention
The object of this invention is to provide one and have good bonding performance, have the thermal resistance core significantly rising to performance simultaneously and make material, this thermistor has positive temperature coefficient effect, room temperature resistivity 10
-2Ω .cm, PTC intensity is greater than 10
7the individual order of magnitude, provides the manufacture method of this material simultaneously.
Technical scheme of the present invention is achieved in that a kind of thermistor core, described overcurrent self-recoverage protector is made up of the core be arranged between double layer of metal film, described metal film is provided with extraction electrode, and its outer encapsulating insulating sealing materials, it is characterized in that: described core is made up of (weight ratio) following component, 28-33% high density polyethylene (HDPE), 18-23% electric conducting material, 0.2-0.5% antioxidant 1010 i.e. four [β-(3, 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, molecular formula C73H108O12, the fire retardant composition that 44-48% magnesium hydroxide is formed.Described core best composition forms (weight ratio), 30% high density polyethylene (HDPE), 19.5% electric conducting material, 0.3% antioxidant, 46% fire retardant composition.
Also be added with other auxiliary agents of 0.1-7% in described core, other described auxiliary agents comprise zinc oxide and calcium stearate.The Main Function of other auxiliary agents improves core processing characteristics, therefore can more practical situation add.Described its coefficient optimum proportion of other auxiliary agents is 4.2%.
Electric conducting material is carbon black metal nickel powder or conductivity ceramics powder or carbon nano-tube or conductive black.
A production technology for thermistor core, described production craft step:
By each for composite material component high density polyethylene (HDPE), electric conducting material, antioxidant, fire retardant, be placed in baking oven or vacuum drying oven and carry out moisture removal preliminary treatment, temperature controls at 80 ~ 180 DEG C, and the vacuum pre-treatment time is 40 ~ 46h; Then will be evenly mixing in banbury under banbury oil temperature 160 ~ 180 DEG C of temperature, delay pressurization 30-60min through weighing and proportioning by pretreated above-mentioned raw materials, banburying time 0.8 ~ 1.5h and banburying material agglomerating after, be cut into small pieces after being cooled to normal temperature, through crusher in crushing about one-tenth≤5mm particle, then make the non-copper membrane chip material in two sides with mill or extruder;
When described high density polyethylene (HDPE), electric conducting material, antioxidant, fire retardant preliminary treatment, the technological parameter of vacuum tank be temperature range Optimal Control at 130-180 degree, vacuum degree is-0.05 ~ 0.08MPa.
Before carrying out preliminary treatment, described resin and flame retardant materials with a conventional oven at 90 ~ 100 degree of dry 2H.
Before carrying out preliminary treatment, electric conducting material is first a conventional oven 150 degree of process 24 hours.
Be cross-linked with gamma-rays (Co60) or employing electron accelerator irradiation, irradiation technique parameter, irradiation accumulated dose 50 ~ 150KGY, energy 2 ~ 10Mev, each irradiation 5 ~ 20KGY, irradiation 3 ~ 5 times.
Beneficial effect of the present invention is:
By adopting high density polyethylene, electric conducting material, antioxidant, the scientific matchings such as fire retardant, special banburying, under Vacuum Pressure blade technolgy, be cross-linked through gamma-rays (Co60) electron accelerator irradiation again, stable conductive network is formed in core, making has positive temperature coefficient, high PTC intensity, the thermal resistance core of low-resistivity, this core only has 1/3 of mill run, and overall dimension also can significantly be reduced, make in application that it can be more convenient and electron trade, especially be applicable to using in the small size electronic equipments such as mobile phone/panel computer,
This core also has good cementability simultaneously, because its high-voltage resistance capability reaches 600V, therefore to ensureing that electronic equipments safety has significant effect; Above-mentioned core room temperature resistivity is 0-2 Ω .cm, and PTC intensity is greater than 10
7the individual order of magnitude, prepares the super-small of circuit protection, the PPTC product of super-low resistance.Step out a substantive step in the small size of PPTC material product and resistance lowering application aspect, break the technical monopoly of external element manufacturer, reduce the purchase cost of domestic electronic enterprise.The present invention is withstand voltage, and 600V type Self-resetting overcurrent protector (PPTC thermistor product) can use in 60 ~ 90 DEG C of high temperature, 600V high voltage environment; overcoming when 600V under high voltage can not the defect of Long-Time Service; in use when under high pressure, temperature exceedes certain value, its resistance value along with the rising of temperature be almost in 10
5~ 10
6increasing of phase step type, plays available protecting circuit function.Solve the problem that PTC product resistance to pressure is inadequate, ensure that product pressure resistance improves 30%.
Product the key technical indexes: proof voltage 480V exceedes national standard >=25%, maximum proof voltage ability reaches 600V; Can performance recovery to the leveled time t≤1min of initial value about 1.6 times; Ohmic polarization rate extreme difference δ value and dynamic electric resistor rate of change are all less than 30%, and energising in ageing-resistant 1 minute+1 minute power-off cyclic fatigue 1000 times, does not burn and do not split.Exceed material Curie point 130 ~ 140 DEG C once product temperature, its resistance value along with the rising of temperature be almost increasing in phase step type; There is unique positive temperature coefficient resistor characteristic, extensively can be suitable as over-current protection device.
The present invention is also by unique processing technology in addition, and as banburying core, vacuum compressing tablet etc., banburying matrix process for pressing, can improve homogeneity of product to a greater extent, and significantly reduction operator's working strength and product quality depend on human users's level unduly.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
The present invention essentially discloses the core technology in a kind of thermistor core, namely be used in this overcurrent self-recoverage protector by the core be arranged between double layer of metal film, the electric property of this chip material to thermistor plays conclusive effect, described core is made up of (weight ratio) following component, 28-33% high density polyethylene, 18-23% electric conducting material, 0.2-0.5% antioxidant 1010 i.e. four [β-(3, 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, molecular formula C73H108O12, the fire retardant composition that 44-48% magnesium hydroxide is formed.The present invention adopts the resin material with high strength PTC effect; namely high density polyethylene; with electric conducting material and other auxiliary materials; under special banburying, Vacuum Pressure blade technolgy; make the withstand voltage 600V compound chip material of high PTC intensity, low-resistivity; be cross-linked through gamma-rays (Co60) electron accelerator irradiation, form stable conductive network at compound chip material, making can withstand voltage 600V Self-resetting overcurrent protector (PPTC thermistor).Electric conducting material wherein can use electric conducting material for metal nickel powder or conductivity ceramics powder or or carbon nano-tube etc. there is the material of good electric conductivity.And by add suitable auxiliary material as: fire retardant and antioxidant etc. improve the combination property of core.The overcurrent self-recoverage protector overall dimension made by adopting above-mentioned core is 1/2 of mill run, and internal resistance is 1/3 of mill run, has that size is little, internal resistance is low, high voltage bearing feature.Under the said goods possesses the prerequisite of volume and performance advantage at the same time, provide technical guarantee for developing the little premium quality product of electron trade making volume rapidly.
In order to improve the performance of core of the present invention further, also be added with other auxiliary agents of 0.1-7% in described core, other described auxiliary agents comprise zinc oxide, calcium stearate, and it is crosslinked in irradiation process that zinc oxide tightens and improves resin, form stable conductive network, improve core performance; Calcium stearate is that lubricate is convenient to core processing, improves the shear action of material.Described its coefficient optimum proportion of other auxiliary agents is 4.2%.Above-mentioned two kinds of adding ingredients are the component improving processing performance, can add above-mentioned component, still can produce the core meeting performance requirement in the good situation of working condition.
Core best composition described in the present invention forms (weight ratio), 30% high density polyethylene, 19.5% electric conducting material, 0.3% antioxidant, 46% fire retardant,
2.2%calcium stearate
2%zinc oxide forms.By adopting this proportioning, technique effect of the present invention can be made to reach the highest, obviously improving the processing performance of product simultaneously, make it have best complex art effect.
Electric conducting material in the present invention is conductive black or metal nickel powder or conductivity ceramics powder or or carbon nano-tube.Above-mentioned several preferred electric conducting material, is also fine as long as use other materials to meet the performance used.
Under the prerequisite adopting above-mentioned material and proportioning, production technology of the present invention comprises following four steps:
Core material of the present invention makes, and because core is as the technological core of overcurrent self-recoverage protector, this operation will determine the basic mechanical design feature of overcurrent self-recoverage protector;
By each for composite material component high molecular polymer, conductive black, antioxidant, fire retardant, be placed in baking oven or vacuum drying oven, the use of baking oven carries out except moisture desiccation to various raw material especially resin HDPE, electric conducting material, fire retardant, once material contains moisture, affect resistance and the performance of product, product easily bubbles or bulge in welding process in addition, causes product rejection; Vacuum drying oven is convenient under negative pressure, and steam is removed as early as possible.Resin and flame retardant materials with a conventional oven at 90 ~ 100 degree of dry 2H, electric conducting material is first a conventional oven 150 degree of process 24 hours, and then put into the dry 22 ~ 24H of vacuum drying oven 150 degree and carry out preliminary treatment, here preferably temperature range as: 130-150 degree, vacuum degree is-0.05 ~ 0.08MPa.The vacuum pre-treatment time is 40 ~ 46h; Then will by pretreated above-mentioned raw materials through weighing and proportioning banbury oil temperature 160 ~ 190 DEG C of temperature, postpone pressurization 30min, pressure 0.4 ~ 0.6MPA.Under evenly mixing in banbury, banburying time 0.8 ~ 1.5h is that the banburying time is different according to banbury volume, the temperature reason proper extension banburying time, the corresponding relation of banburying time correspondence and volume/temperature etc., the volume larger banburying time is longer, the ambient temperature low banburying time is longer, after banburying material is agglomerating, be cut into small pieces after being cooled to normal temperature, through crusher in crushing about one-tenth≤5mm particle, then two sides non-copper membrane oblong chips material is made with mill or extruder, here the oblong chips material of two sides copper membrane also directly can be made by extruding copper membrane all-in-one, like this can between utilize multi-functional equipment time processing to put in place step B cited below.
B, two sides non-copper membrane oblong chips material;
Core is clipped in two-layer between the Copper Foil of plating charcoal process, be put in the pressing mold of vacuum press, 5 ~ 15MPa compressing tablet is given at vacuum press, (this back veneer vacuum vulcanization machine and vacuum press are above an equipment, compressing technique: preheating 5min, sulfuration hot pressing 5min, hot pressing pressure 5 ~ 15MPa, hot pressing temperature 170 ~ 190 DEG C, sheet thickness 2 ~ 4mm, vacuum degree-0.05 ~ 0.08MPa.
C, the materials processing of copper membrane oblong chips and process
By the sheet material pressed or the oblong chips directly making two sides copper membrane through extruding copper membrane all-in-one, loading in polybag or preservative film, being cross-linked with gamma-rays (Co60) or employing electron accelerator irradiation.Irradiation technique parameter, as irradiation accumulated dose 50 ~ 150KGY, energy 2 ~ 10Mev, each irradiation 5 ~ 20KGY, the inferior technical parameter of irradiation 3 ~ 5.
The encapsulation of D, core and process
Chip after irradiation, need to be washed into the semi-finished dimensions shape of needs, extraction electrode of burn-oning respectively on the two sides being covered with copper film through punch press according to client's resistance, semi-finished product are welded by the then technological parameter such as the pre-heat treatment 80 ~ 170 temperature/0.1 ~ 0.2h time in an oven in 270 ~ 285 degree of Pb-free solder stoves.
Finally by the semi-finished product welded then through encapsulating epoxy resin or coat insulating varnish, and carry out encapsulating, heat curing processes makes finished product.The technique of solidification belongs to industry universal technology substantially.
Carry out encapsulating, curing process wants: temperature: 80 DEG C ± 2 DEG C insulations: after 30min, be immediately warming up to 150 DEG C ± 2 DEG C insulation: 30min and close baking oven, Temperature fall, to less than 60 DEG C, can go out baking oven.Product after encapsulating solidification, surface is that the epoxy resin of one deck densification can prevent the product moisture absorption and enhance product performance.After product to be solidified drops to normal temperature, take out from baking oven, caudal leg on excision wire is carried out to product, be convenient to conducting energising in energising operation, energising operation be to every only solidification after product (after excision caudal leg) to give the energising of certain electric current and voltage aging, electric current is 5 times of electric currents and voltage 220V, the time 3 ~ 10s of product work electric current, screening defective item and improve the quality of products, performance.
Exemplify the application example of several overcurrent self-recoverage protector core proportioning below:
Embodiment 1:
The pulp furnish that core adopts is: 19% high density polyethylene (HDPE); 19% nickel powder, nickel powder particle 1 ~ 2um; 0.3% antioxidant 1010 i.e. four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, molecular formula C73H108O12; The fire retardant that 45% magnesium hydroxide is formed;
6.7%zinc oxide.
First above-mentioned raw material is placed in vacuum tank or baking oven and carries out moisture removal preliminary treatment.High-density polyethylene resin and flame retardant of magnesium hydroxide material with a conventional oven at 90 degree of dry 2H, electric conducting material is first a conventional oven 150 degree of process 24 hours, and then this electric conducting material is all put into vacuum drying oven 150 degree of dry 22h carry out preliminary treatment, temperature controls at 80 ~ 150 DEG C, here adopt temperature range as: 130 degree, vacuum degree is-0.05MPa.The vacuum pre-treatment time is 46h;
Then will put into banbury by pretreated above-mentioned raw materials through weighing and proportioning, and need to illustrate to be exactly that weighing of raw material is preferably carried out after pre-processing here, the impact of water content can be avoided so as far as possible, make its proportioning more accurate.Banbury oil temperature 160 DEG C of temperature, delay pressurization 30min, pressure 0.4MPA.Under evenly mixing in banbury, banburying time 1.5h, the banburying time is according to banbury volume difference, temperature reason proper extension banburying time, the corresponding relation of banburying time correspondence and volume/temperature etc., the volume larger banburying time is longer, the ambient temperature low banburying time is longer, after banburying material is agglomerating, be cut into small pieces after being cooled to normal temperature, through crusher in crushing about one-tenth≤5mm particle, then make two sides non-copper membrane oblong chips material with mill or extruder, or extrude the oblong chips material that two sides copper membrane directly made by copper membrane all-in-one.Then two sides non-copper membrane oblong chips material is made with mill or extruder.
Embodiment 2
The pulp furnish that core adopts is: 30% high density polyethylene (HDPE); 19.5% nickel powder, the particle 1 ~ 2um of nickel powder, purity electronic level; 0.3% antioxidant 1010 i.e. four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, molecular formula C73H108O12; The fire retardant that 46% magnesium hydroxide is formed;
4.2%calcium stearate.
First above-mentioned raw material is placed in vacuum tank or baking oven and carries out moisture removal preliminary treatment.High-density polyethylene resin and flame retardant of magnesium hydroxide material with a conventional oven at 100 degree of dry 2H, mainly remove the moisture in raw material here, the time can suitably adjust.Electric conducting material first a conventional oven 150 degree of process 24 hours to remove moisture, and then electric conducting material is put into vacuum drying oven 180 degree of row preliminary treatment, vacuum degree is 0.08MPa.The vacuum pre-treatment time is 40h;
Then will put into banbury by pretreated above-mentioned raw materials through weighing and proportioning, and need to illustrate to be exactly that weighing of raw material is preferably carried out after pre-processing here, the impact of water content can be avoided so as far as possible, make its proportioning more accurate.Banbury oil temperature 190 DEG C of temperature, delay pressurization 40min, pressure 0.6MPA.Under evenly mixing in banbury, banburying time 0.8h, the banburying time is according to banbury volume difference, temperature reason proper extension banburying time, the corresponding relation of banburying time correspondence and volume/temperature etc., the volume larger banburying time is longer, the ambient temperature low banburying time is longer, after banburying material is agglomerating, be cut into small pieces after being cooled to normal temperature, through crusher in crushing about one-tenth≤5mm particle, then make two sides non-copper membrane oblong chips material with mill or extruder, or extrude the oblong chips material that two sides copper membrane directly made by copper membrane all-in-one.Then two sides non-copper membrane oblong chips material is made with mill or extruder.
Embodiment 3
The pulp furnish that core adopts is: 31% high density polyethylene (HDPE); 20% carbon nano-tube, the carbon nanotube technology parameter of employing is long 12um, caliber 10nm, surface area>=230m
2/ g, bulk density 0.05g/cm
3; 0.4% antioxidant 1010 i.e. four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, molecular formula C73H108O12; The fire retardant that 46% magnesium hydroxide is formed;
2.6%calcium stearate.
First above-mentioned raw material is placed in vacuum tank or baking oven and carries out moisture removal preliminary treatment.High-density polyethylene resin and flame retardant of magnesium hydroxide material with a conventional oven at 95 degree of dry 2H, mainly remove the moisture in raw material here, the time can suitably adjust.Electric conducting material first a conventional oven 150 degree of process 24 hours to remove moisture, this electric conducting material can all be put into vacuum drying oven 180 degree of row preliminary treatment more here, vacuum degree is 0.07MPa.The vacuum pre-treatment time is 42h;
Then will put into banbury by pretreated above-mentioned raw materials through weighing and proportioning, and need to illustrate to be exactly that weighing of raw material is preferably carried out after pre-processing here, the impact of water content can be avoided so as far as possible, make its proportioning more accurate.Banbury oil temperature 180 DEG C of temperature, delay pressurization 60min, pressure 0.5MPA.Under evenly mixing in banbury, banburying time 1h, the banburying time is according to banbury volume difference, temperature reason proper extension banburying time, the corresponding relation of banburying time correspondence and volume/temperature etc., the volume larger banburying time is longer, the ambient temperature low banburying time is longer, after banburying material is agglomerating, be cut into small pieces after being cooled to normal temperature, through crusher in crushing about one-tenth≤5mm particle, then make two sides non-copper membrane oblong chips material with mill or extruder, or extrude the oblong chips material that two sides copper membrane directly made by copper membrane all-in-one.Then two sides non-copper membrane oblong chips material is made with mill or extruder.
Embodiment 4
The pulp furnish that core adopts is: 31.5% high density polyethylene (HDPE); 20% conductive black, described conductive black granular size is 30 ~ 75nm; 0.4% antioxidant 1010 i.e. four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, molecular formula C73H108O12; The fire retardant that 46.5% magnesium hydroxide is formed;
0.6%zinc oxide.
By each for composite material component high density polyethylene (HDPE), electric conducting material, antioxidant, fire retardant, be placed in baking oven or vacuum drying oven and carry out moisture removal preliminary treatment, temperature controls at 80 DEG C, and the vacuum pre-treatment time is 45h;
Then will put into banbury by pretreated above-mentioned raw materials through weighing and proportioning, and need to illustrate to be exactly that weighing of raw material is preferably carried out after pre-processing here, the impact of water content can be avoided so as far as possible, make its proportioning more accurate.Banbury oil temperature 180 DEG C of temperature, delay pressurization 60min, pressure 0.5MPA.Under evenly mixing in banbury, banburying time 1h, the banburying time is according to banbury volume difference, temperature reason proper extension banburying time, the corresponding relation of banburying time correspondence and volume/temperature etc., the volume larger banburying time is longer, the ambient temperature low banburying time is longer, after banburying material is agglomerating, be cut into small pieces after being cooled to normal temperature, through crusher in crushing about one-tenth≤5mm particle, then make two sides non-copper membrane oblong chips material with mill or extruder, or extrude the oblong chips material that two sides copper membrane directly made by copper membrane all-in-one.Then two sides non-copper membrane oblong chips material is made with mill or extruder.
Embodiment 5
The pulp furnish that core adopts is: 31.5% high density polyethylene (HDPE); 22% conductive black, described conductive black granular size is 30 ~ 75nm; 0.5% antioxidant 1010 i.e. four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, molecular formula C73H108O12; The fire retardant that 46.5% magnesium hydroxide is formed.Because zinc oxide and calcium stearate belong to the raw material of selectivity interpolation, therefore in the present embodiment for adding this raw material.Because processing technology is with embodiment is identical, therefore omit processing part content above.
Embodiment 6
The pulp furnish that core adopts is: 26% high density polyethylene (HDPE); 22.5% conductive black, described conductive black granular size is 30 ~ 75nm; 0.5% antioxidant 1010 i.e. four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, molecular formula C73H108O12; The fire retardant that 51% magnesium hydroxide is formed.Because zinc oxide and calcium stearate belong to the raw material of selectivity interpolation, therefore in the present embodiment for adding this raw material.Because processing technology is with embodiment is identical, therefore omit processing part content above.
Embodiment 7
The pulp furnish that core adopts is: 36% high density polyethylene (HDPE); 16% conductive black, described conductive black granular size is 30 ~ 75nm; 0.2% antioxidant 1010 i.e. four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, molecular formula C73H108O12; The fire retardant that 47.8% magnesium hydroxide is formed.Because zinc oxide and calcium stearate belong to the raw material of selectivity interpolation, therefore in the present embodiment for adding this raw material.Because processing technology is with embodiment is identical, therefore omit processing part content above.
Embodiment 8
The pulp furnish that core adopts is: 32.65% high density polyethylene (HDPE); 26% conductive black, described conductive black granular size is 30 ~ 75nm; 0.35% antioxidant 1010 i.e. four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, molecular formula C73H108O12; The fire retardant that 41% magnesium hydroxide is formed.Because zinc oxide and calcium stearate belong to the raw material of selectivity interpolation, therefore in the present embodiment for adding this raw material.Because processing technology is with embodiment is identical, therefore omit processing part content above.
Embodiment 9
The pulp furnish that core adopts is: 33% high density polyethylene (HDPE); 22% conductive black, described conductive black granular size is 30 ~ 75nm; 0.3% antioxidant 1010 i.e. four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, molecular formula C73H108O12; The fire retardant that 44.6% magnesium hydroxide is formed, adds the zinc oxide of 0.1% simultaneously.Because processing technology is with embodiment is identical, therefore omit processing part content above.
Embodiment 10
The pulp furnish that core adopts is: 30% high density polyethylene (HDPE); 20% conductive black, described conductive black granular size is 30 ~ 75nm; 0.4% antioxidant 1010 i.e. four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, molecular formula C73H108O12; The fire retardant that 48.9% magnesium hydroxide is formed, adds the calcium stearate of 0.1% simultaneously.Because processing technology is with embodiment is identical, therefore omit processing part content above.
Described above is only preferred embodiment of the present invention, and above-mentioned specific embodiment is not limitation of the present invention.In technological thought category of the present invention, can occur various distortion and amendment, all those of ordinary skill in the art, according to describing retouching, the amendment made above or equivalent replacing, all belong to the scope that the present invention protects.
Claims (10)
1. a thermistor core; described overcurrent self-recoverage protector is made up of the core be arranged between double layer of metal film; described metal film is provided with extraction electrode; and its outer encapsulating insulating sealing materials; it is characterized in that: described core is made up of (weight ratio) following component; 28-33% high density polyethylene (HDPE); 18-23% electric conducting material; 0.2-0.5% antioxidant 1010 i.e. four [β-(3; 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester; the fire retardant composition that molecular formula C73H108O12,44-48% magnesium hydroxide is formed.
2. a kind of thermistor core according to claim 1, it is characterized in that: other auxiliary agents being also added with 0.1-7% in described core, other described auxiliary agents comprise zinc oxide and calcium stearate.
3. a kind of thermistor core according to claim 2, is characterized in that: described its coefficient optimum proportion of other auxiliary agents is 4.2%.
4. according to a kind of thermistor core of claim 1-3 described in any one, it is characterized in that: described core best composition forms (weight ratio), 30% high density polyethylene (HDPE), 19.5% electric conducting material, 0.3% antioxidant, 46% fire retardant composition.
5. a kind of thermistor core according to claim 1, is characterized in that: electric conducting material is carbon black metal nickel powder or conductivity ceramics powder or carbon nano-tube or conductive black.
6. the production technology of a kind of thermistor core according to claim 1, is characterized in that: described production craft step:
By each for composite material component high density polyethylene (HDPE), electric conducting material, antioxidant, fire retardant, be placed in baking oven or vacuum drying oven and carry out moisture removal preliminary treatment, temperature controls at 80 ~ 180 DEG C, and the vacuum pre-treatment time is 40 ~ 46h; Then will be evenly mixing in banbury under banbury oil temperature 160 ~ 180 DEG C of temperature, delay pressurization 30-60min through weighing and proportioning by pretreated above-mentioned raw materials, banburying time 0.8 ~ 1.5h and banburying material agglomerating after, be cut into small pieces after being cooled to normal temperature, through crusher in crushing about one-tenth≤5mm particle, then make the non-copper membrane chip material in two sides with mill or extruder.
7. the production technology of a kind of thermistor core according to claim 6, it is characterized in that: when described high density polyethylene (HDPE), electric conducting material, antioxidant, fire retardant preliminary treatment, the technological parameter of vacuum tank be temperature range Optimal Control at 130-180 degree, vacuum degree is-0.05 ~ 0.08MPa.
8. the production technology of a kind of thermistor core according to claim 6, is characterized in that: before carrying out preliminary treatment, described resin and flame retardant materials with a conventional oven at 90 ~ 100 degree of dry 2H.
9. the production technology of a kind of thermistor core according to claim 6, is characterized in that: before carrying out preliminary treatment, and electric conducting material is first a conventional oven 150 degree of process 24 hours.
10. the production technology of a kind of thermistor core according to claim 6, it is characterized in that: be cross-linked with gamma-rays (Co60) or employing electron accelerator irradiation, irradiation technique parameter, irradiation accumulated dose 50 ~ 150KGY, energy 2 ~ 10Mev, each irradiation 5 ~ 20KGY, irradiation 3 ~ 5 times.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106248241A (en) * | 2016-08-30 | 2016-12-21 | 广东爱晟电子科技有限公司 | Strengthen the method and device of heat sensitive chip and temperature sensor electric property stability |
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