CN102634177A - Composite electromagnetic shielding material for cables - Google Patents
Composite electromagnetic shielding material for cables Download PDFInfo
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- CN102634177A CN102634177A CN2012101461805A CN201210146180A CN102634177A CN 102634177 A CN102634177 A CN 102634177A CN 2012101461805 A CN2012101461805 A CN 2012101461805A CN 201210146180 A CN201210146180 A CN 201210146180A CN 102634177 A CN102634177 A CN 102634177A
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- electromagnetic shielding
- shielding
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- electromagnetic
- insulating heat
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Abstract
The invention provides a composite electromagnetic shielding material, belonging to the power electronic field. The composite electromagnetic shielding material is mainly made of electromagnetic shielding filler and thermoplastic plastic, wherein the mass ratio of the electromagnetic shielding filler to the thermoplastic plastic is (30-60):(70-40). The electromagnetic shielding filler refers to conductive carbon composite micro-sphere grains of which the surface is wrapped with Zn2-W type ferrite. The filler and the thermoplastic plastic are obtained by mixing, milling, extruding and prilling; the material can be used for manufacturing shells or shielding layers of power electric appliances; and meanwhile the material has strong shielding and absorbing efficiency.
Description
Technical field
The present invention relates to a kind of electromagnetic shielding material that is used for field of power electronics, this material is the inside and outside hertzian wave that produces of shielding cable, electrical equipment and electronic devices and components effectively.
Background technology
(Electromagnetic Compatibility EMC), refers to that certain electronics neither disturbs miscellaneous equipment to electromagnetic compatibility, the performance that also not influenced by miscellaneous equipment simultaneously.Along with power electronics industrial development and people improve the requirement of product quality and security, electromagnetic compatibility has become an important index of quality product.The main means that realize electromagnetic compatibility are electromagnetic shieldings; Promptly to carrying out the isolation of EM field between two area of space; With control electric field, magnetic field and hertzian wave by a zone to another regional induction and radiation; Specifically, be surrounded with the interfering source of shielding material exactly, prevent that interfere with electromagnetic field is to external diffusion components and parts, circuit, subassembly, cable or total system; Perhaps receiving circuit, equipment or system are surrounded, prevent that them from receiving the influence of external electromagnetic field with shielding material.
The main mechanism that can produce shielding effect produces sorption (eddy-current loss), reflex action (hertzian wave is at the boundary reflection on the shielding) and negative function from shielding material to outside interference hertzian wave such as lead, cable, component, circuit or system and internal electrical magnetic wave, and (electromagnetic induction produces reverse EM field on screen layer; Can offset part and disturb hertzian wave), weaken electromagnetic interference thereby make.
At present, screen method commonly used has following several kinds: (1) utilizes the eddy current that produces in the metallic substance of low-resistivity when the frequency of interfere with electromagnetic field is higher, forms externally to come electromagnetic negative function, thereby reaches the effect of shielding.That has used at present, has copper system, nickel system, a silver-colored based material filler as electromagnetic shielding material; (2) when disturbing electromagnetic frequency low, adopt the material of high permeability, thereby make magneticline of force be limited in shielding inside, prevent that the space that is diffused into shielding from going, such as adopting high magnetic permeability metallic substance or soft magnetic ferrite.(3) under some occasion,, often adopt the different metallic material to form the multilayer screen body, such as adopting Ag/Cu, Cu/ graphite, Ag/SiO2 etc. if when requiring that the high and low frequency EM field all had good shield effectiveness.
In system commonly used at present, be difficult to accomplish the low-and high-frequency hertzian wave is effectively absorbed simultaneously, in addition, adopt metal as conductive filler material, under height filling situation, make the density of shielding material increase, suppleness descends, and makes its application be restricted.According to the principle of electromagnetic shielding, the factor that really influences the shielding effectiveness of shielding has two: one is that whole shielding surface must be the conduction successive, and another is that the magnetic conductor that directly penetrates shielding can not be arranged.Adopt under the conducting metal filler situation simple, a lot of conduction point of discontinuity are arranged on the shielding, topmost one type is the non-conductive slit that shielding different piece junction forms.These nonconducting slits have just produced electromagnetic leakage, can leak equally on the slit from container as fluid.
So people adopt Ferrite Material to be used as the defective that absorbing material is eliminated simple reflection of electromagnetic wave.The brilliant M type of hexagonal strontium ferrites is one type of very important radio-radar absorber, and its natural resonant frequency is higher, under high frequency, is difficult for producing skincurrent; Specific inductivity is less, can mix with other absorbing material the electromagnetic parameter that is used for to microwave absorbing coating is regulated, yet; Shortcoming is that technology difficulty is bigger in the preparation, and the change a little of technology will exert an influence to absorbing property, simultaneously; Improve the magnetic permeability of single M type ferrite, difficulty is also bigger.If adopt the ferromagnetic metal powder absorption agent of higher magnetic permcability; Though it has good temperature stability and higher saturation magnetization Ms; But these ferromagnetic metal powder absorption agents can not be too big because of being subject to " skin effect " granularity under microwave frequency band; And require to be evenly distributed, volume(tric)fraction can not be excessive, therefore also limits the raising of its loading level.In addition, ferromagnetic metal material has heavy defective equally.
Therefore, in shielding material, no matter be single employing ferrite or ferromagnetic metal material and the simple composite between them, all can't obtain the shielding material of lightweight, high filling, good effectiveness of shielding.Seek out breakthrough, need on the structure of shielding filler, innovate.Consider that the usable reflection of hertzian wave in screen layer is the essence that reaches best shield effectiveness with absorbing,, reduce the electric leakage leakage field, it is contemplated that then shield effectiveness will improve greatly if the structure of filler can make hertzian wave multiple reflection and absorption in screen layer.The applicant finds in the research that utilizes the Hydrothermal Preparation carbosphere, through control preparation technology, can obtain ideal conductive carbon spheroidal particle; So, in the later stage that the carbon spheroidal particle forms, if introducing has the W type ferrite of high saturation and magnetic intensity simultaneously on the surface; Then can form a kind of new complex conductive fillers; With the screen layer that this filler is processed, can make repeatedly reflection and absorption in filler particles of hertzian wave, reach good wave-absorbing effect.Constituted thinking of the present invention thus.
Summary of the invention
The object of the invention provides a kind of at the light composite material that has than forceful electric power magneticshielding function.
The technical scheme that the present invention adopts is:
A kind of composite electromagnetic shield materials that is used for the power electronics cable, said composite electromagnetic shield materials are that 30～60: 40～70 electromagnetic shielding filler and thermoplastics are processed by mass ratio mainly.
Said thermoplastics is used for the thermoplastics of cable material for this area routine.Thermoplastics is a present consumption base polymer material widely, has the characteristic of thermoplastic, hardening by cooling, and deliquescing can be flowed in when heating, and hardening can moulding during cooling, and this process can be carried out repeatedly.Be usually used in the power cable field as insulation layer or with the isolated resist of external environment, like Vilaterm, Vestolen PP 7052, SE, PS, nylon, polybutylene terephthalate etc.The present invention adopts polybutylene terephthalate commonly used (PBT).
The conductive carbon micro ball particle of said electromagnetic shielding filler for adopting hydrothermal method to make, simultaneously, this microsphere surface is enclosed with one deck Zn
2-W type ferrite.Show that through research this complex microsphere can be given full play to top layer Zn
2The electromagnetic wave shielding function of the electromagnetic wave absorption function of-W type ferrite and center conductive carbosphere makes hertzian wave behind the multiple reflection of carbosphere surface, absorbed by ferrite layer, reaches stronger effectiveness.Simultaneously, with respect to traditional conducting metal shielding material,, make more lightweight of this electromagnetic shielding material because ferrite layer and carbosphere all have lower density.
Said composite conducting carbosphere particulate is of a size of 0.5～10 μ m.
In order to guarantee good binding between electromagnetic shielding filler and the polyvinyl resin matrix, comprise also in the said insulating heat-conduction material that quality is the coupling agent of said electromagnetic shielding filler quality 0.5～1%.
Said coupling agent is this area routine be used to insulate coupling agent of thermal conducting material; Like silane coupling agent and titanate coupling agent etc., the result of research according to the present invention finds that silane coupling agent and polyethylene property are better; Therefore, be preferably the higher silane coupling agent KH550 of cost performance among the present invention.
Said insulating heat-conduction material is prepared by following method: the silane coupling agent that in the composite conducting carbosphere of 30～60 mass parts, adds 0.3～0.6 mass parts; With the polybutylene terephthalate mixed with resin of 70～40 mass parts after twin screw extruder is mixing extrudes; Melting temperature is 230 ℃, obtains said insulating heat-conduction material.
Beneficial effect of the present invention is mainly reflected in: adopt special electromagnetic shielding filler; This filler can obtain good capability of electromagnetic shielding on the basis that guarantees the plastic substrate excellent machinability, have lower density simultaneously, than traditional conducting metal filler; Capability of electromagnetic shielding improves 20%; Density reduces half the, and has good flexibility, does not influence the requirements such as bending winding of cable.Require to have better application prospect in the field of electromagnetic shielding and flexible light weight at the same time.
Embodiment
Below in conjunction with specific embodiment the present invention is described further, but protection scope of the present invention is not limited in this:
Embodiment 1～4:
Be coated with Zn
2The preparation of the conductive carbon complex microsphere of-W type ferrite: adopt hydrothermal method and low-temperature heat treatment to obtain to be coated with Zn
2The conductive carbon complex microsphere of-W type ferrite.With the precursor material of glucose as carbosphere; After hydrothermal reaction kettle carries out for some time, add iron nitrate, zinc oxide, Strontium carbonate powder, proceed hydro-thermal reaction; Generate the surface and contain the carbosphere of Fe, Zn, Sr; Again this microballoon is heat-treated under 500-800 ℃, make its surperficial ferriteization and inner greying, obtain being coated with Zn
2The conductive carbon complex microsphere of-W type ferrite.
The conductive carbon complex microsphere that obtains is taken by weighing 300g, 400g, 450g, 500g, 550g, 600g; Add 3g, 4g, 4.5g, 5g, 5.5g, 6g silane coupling agent (model: KH550 respectively; The Zhejiang Provincial Chemical Engineering Research Inst) carries out surface treatment; Mix with 700g, 600g, 550g, 500g, 450g and 400g polybutylene terephthalate dry back, mixing extruding on the small capacity double screw extrusion press then, and melting temperature is 230 ℃.The density of gained material obtains with Archimedes's drainage, and the test of effectiveness of shielding detects according to GB12190-2006 " testing method of electromagnetic shielding chamber effectiveness of shielding " and QJ2809-1996 " testing method of planar materials effectiveness of shielding ".The measured results show, in the 1KHz-1GHz scope, the effectiveness of shielding of sample is more than 76db, and maximum effectiveness of shielding reaches 85db.In the 1GHz-30GHz scope, the effectiveness of shielding of sample is more than 35dB.
The performance of gained shielding material under the table 1 difference amount of filling out
Claims (7)
1. composite electromagnetic shield materials that is used for field of power electronics, said composite electromagnetic shield materials are that 30～60: 70～40 electromagnetic shielding filler and thermoplastics are processed by mass ratio mainly.
2. composite electromagnetic shield materials as claimed in claim 1 is characterized in that said thermoplastics is a polybutylene terephthalate.
3. insulating heat-conduction material as claimed in claim 1 is characterized in that said electromagnetic shielding filler is for being coated with Zn
2The conductive carbon complex microsphere particle of-W type ferrite.
4. insulating heat-conduction material as claimed in claim 3 is characterized in that said complex microsphere particle size is 0.5～10 μ m.
5. like the described insulating heat-conduction material of one of claim 1～4, it is characterized in that also comprising in the said electromagnetic shielding material that quality is the coupling agent of said electromagnetic shielding filler quality 0.5～1%.
6. insulating heat-conduction material as claimed in claim 5 is characterized in that said coupling agent is a silane coupling agent.
7. insulating heat-conduction material as claimed in claim 1 is characterized in that said insulating heat-conduction material is prepared by following method: at the Zn that is coated with of 30～60 mass parts
2The silane coupling agent that adds 0.3～0.6 mass parts in the conductive carbon complex microsphere of-W type ferrite mixes with the polybutylene terephthalate of 70～40 mass parts after twin screw extruder is mixing extrudes, and obtains said composite electromagnetic shield materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210146180.5A CN102634177B (en) | 2012-05-07 | 2012-05-07 | A kind of composite electromagnetic shield materials for cable |
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| CN201210146180.5A CN102634177B (en) | 2012-05-07 | 2012-05-07 | A kind of composite electromagnetic shield materials for cable |
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| CN102634177A true CN102634177A (en) | 2012-08-15 |
| CN102634177B CN102634177B (en) | 2016-04-06 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102945700A (en) * | 2012-10-31 | 2013-02-27 | 中国科学院长春光学精密机械与物理研究所 | Homemade shielded cable accessory EMC (electromagnetic compatibility) thin-film assembly of military equipment |
| CN103887712A (en) * | 2013-09-22 | 2014-06-25 | 重庆力华科技有限责任公司 | Electromagnetic shielding material and spark plug cap |
| CN104361923A (en) * | 2014-12-05 | 2015-02-18 | 成都鼎智汇科技有限公司 | Metallic particle shielding layer and manufacture method thereof |
| CN105848314A (en) * | 2016-06-07 | 2016-08-10 | 安邦电气股份有限公司 | Temperature self-limited heating cable capable of electric energy saving |
| CN107276690A (en) * | 2017-06-29 | 2017-10-20 | 深圳市共进电子股份有限公司 | A kind of WiFi coupling sensitivities deterioration test system and method for testing |
| CN107325747A (en) * | 2017-08-29 | 2017-11-07 | 德阳力久云智知识产权运营有限公司 | A kind of electromagnetic shielding adhesive tape |
| CN107481792A (en) * | 2017-08-29 | 2017-12-15 | 德阳力久云智知识产权运营有限公司 | A kind of shielded cable |
| CN110498998A (en) * | 2019-08-27 | 2019-11-26 | 罗春华 | A kind of electromagnetic shielding engineering plastics and preparation method with three-dimensional structure |
| WO2020207312A1 (en) * | 2019-04-12 | 2020-10-15 | 青岛科技大学 | Magnetic composite semiconductive shielding layer for high-voltage direct current cable and preparation method thereof |
| CN114031902A (en) * | 2021-11-24 | 2022-02-11 | 江西伟普科技有限公司 | Magnetic compound plastic alloy material and preparation method thereof |
| CN114063334A (en) * | 2021-11-26 | 2022-02-18 | 深圳市海菲光电发展有限公司 | Anti-electromagnetic interference liquid crystal display screen |
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| CN102250416A (en) * | 2011-05-25 | 2011-11-23 | 佛山市顺德区高怡新塑料有限公司 | Electromagnetic shielding composite material capable of heating and preparation method thereof |
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| JPS60173052A (en) * | 1984-02-20 | 1985-09-06 | Mitsui Toatsu Chem Inc | Resin composition |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102945700A (en) * | 2012-10-31 | 2013-02-27 | 中国科学院长春光学精密机械与物理研究所 | Homemade shielded cable accessory EMC (electromagnetic compatibility) thin-film assembly of military equipment |
| CN103887712A (en) * | 2013-09-22 | 2014-06-25 | 重庆力华科技有限责任公司 | Electromagnetic shielding material and spark plug cap |
| CN103887712B (en) * | 2013-09-22 | 2016-04-13 | 重庆力华科技有限责任公司 | electromagnetic shielding material and spark plug cap |
| CN104361923A (en) * | 2014-12-05 | 2015-02-18 | 成都鼎智汇科技有限公司 | Metallic particle shielding layer and manufacture method thereof |
| CN104361923B (en) * | 2014-12-05 | 2016-08-24 | 国网山东省电力公司潍坊供电公司 | The manufacture method of metallic particles screen layer |
| CN105848314A (en) * | 2016-06-07 | 2016-08-10 | 安邦电气股份有限公司 | Temperature self-limited heating cable capable of electric energy saving |
| CN107276690A (en) * | 2017-06-29 | 2017-10-20 | 深圳市共进电子股份有限公司 | A kind of WiFi coupling sensitivities deterioration test system and method for testing |
| CN107325747A (en) * | 2017-08-29 | 2017-11-07 | 德阳力久云智知识产权运营有限公司 | A kind of electromagnetic shielding adhesive tape |
| CN107481792A (en) * | 2017-08-29 | 2017-12-15 | 德阳力久云智知识产权运营有限公司 | A kind of shielded cable |
| WO2020207312A1 (en) * | 2019-04-12 | 2020-10-15 | 青岛科技大学 | Magnetic composite semiconductive shielding layer for high-voltage direct current cable and preparation method thereof |
| CN110498998A (en) * | 2019-08-27 | 2019-11-26 | 罗春华 | A kind of electromagnetic shielding engineering plastics and preparation method with three-dimensional structure |
| CN114031902A (en) * | 2021-11-24 | 2022-02-11 | 江西伟普科技有限公司 | Magnetic compound plastic alloy material and preparation method thereof |
| CN114063334A (en) * | 2021-11-26 | 2022-02-18 | 深圳市海菲光电发展有限公司 | Anti-electromagnetic interference liquid crystal display screen |
| CN114063334B (en) * | 2021-11-26 | 2024-03-22 | 深圳市海菲光电发展有限公司 | Anti-electromagnetic interference liquid crystal display |
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| CN102634177B (en) | 2016-04-06 |
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Denomination of invention: Composite electromagnetic shielding material for cable Effective date of registration: 20220106 Granted publication date: 20160406 Pledgee: Hangzhou United Rural Commercial Bank Limited by Share Ltd. Cambridge branch Pledgor: HANGZHOU QIANSHI TECHNOLOGY Co.,Ltd. Registration number: Y2022330000006 |