CN102634177B - A kind of composite electromagnetic shield materials for cable - Google Patents
A kind of composite electromagnetic shield materials for cable Download PDFInfo
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- CN102634177B CN102634177B CN201210146180.5A CN201210146180A CN102634177B CN 102634177 B CN102634177 B CN 102634177B CN 201210146180 A CN201210146180 A CN 201210146180A CN 102634177 B CN102634177 B CN 102634177B
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Abstract
The invention provides a kind of composite electromagnetic shield materials for field of power electronics, described composite electromagnetic shield materials primarily of mass ratio be 30 ~ 60: 70 ~ 40 electromagnetic shielding filler and thermoplastics make.Electromagnetic shielding filler is the conductive carbon complex microsphere particle being coated with Zn2-W type ferrite.Filler and thermoplastics are through mixing, mixing, extruding pelletization and obtaining, and can be used for shell or the screen layer of power electronic devices, this material has stronger shielding and absorptive function simultaneously.
Description
Technical field
The present invention relates to a kind of electromagnetic shielding material for field of power electronics, this material can the effective inside and outside hertzian wave produced of shielding cable, electrical equipment and electronic devices and components.
Background technology
Electromagnetic compatibility (Electromagneticcompatibility, EMC), refers to that certain electronics neither disturbs other equipment, simultaneously also not by the performance that other equipment affect.Along with power electronics industrial expansion and people, the requirement to product quality and security improves, and electromagnetic compatibility has become an important index of quality product.The Main Means realizing electromagnetic compatibility is electromagnetic shielding, namely to the isolation carrying out electric field between two area of space, to control electric field, magnetic field and hertzian wave by a region to the induction in another region and radiation, specifically, be surrounded with the interfering source of shielding material by components and parts, circuit, subassembly, cable or whole system exactly, prevent interfere with electromagnetic field to external diffusion; Or utilize shielding material receiving circuit, equipment or system to be surrounded, prevent them to be subject to the impact of external electromagnetic field.
The main mechanism that can produce shielding effect produces sorption (eddy-current loss), reflex action (boundary reflection of hertzian wave on shielding) and negative function from shielding material to the interference hertzian wave of the outsides such as wire, cable, component, circuit or system and internal electrical magnetic wave, and (electromagnetic induction produces reverse electromagnetic field on the shielding layer, part can be offset and disturb hertzian wave), thus make to weaken electromagnetic interference.
At present, conventional screen method has following several: (1), when the frequency of interfere with electromagnetic field is higher, utilizes the eddy current produced in the metallic substance of low-resistivity, forms the negative function to external electromagnetic wave, thus reaches the effect of shielding.At present, that has applied has copper system, nickel system, silver material as the filler of electromagnetic shielding material; (2) material of high permeability to be adopted when disturbing electromagnetic frequency lower, thus make magnetic line of force be limited in shielding inside, prevent the space being diffused into shielding from going, such as adopt metallic substance or the soft magnetic ferrite of high magnetic permeability.(3) in some cases, if when requiring, to high and low frequency electromagnetic field, all there is good shield effectiveness, often adopt different metallic substance composition multilayer screen bodies, such as adopt Ag/Cu, Cu/ graphite, Ag/SiO
2deng.
In system conventional at present, be difficult to accomplish effectively to absorb low-and high-frequency hertzian wave, in addition, adopt metal as conductive filler material, make the density of shielding material increase in height filling situation, suppleness declines, and its application is restricted simultaneously.According to the principle of electromagnetic shielding, what really affect shielding effectiveness of shielding must be conduct electricity continuous print because to have two: one be whole shielding surface, and another to have the magnetic conductor directly penetrating shielding.When adopting separately conductive metal filler, shielding has and much conducts electricity point of discontinuity, these non-conductive gaps, non-conductive gap that a topmost type shielding body different piece junction is formed just create electromagnetic leakage, as fluid can gap from container be leaked.
So people adopt Ferrite Material to be used as absorbing material to eliminate the defect of simple reflection of electromagnetic wave.The brilliant M-type strontium ferrite of hexagonal is the very important radio-radar absorber of a class, its natural resonant frequency is higher, not easily produce skincurrent in high frequency, specific inductivity is less, can regulate with other absorbing materials electromagnetic parameter to microwave absorbing coating used in combination, but, shortcoming is that technology difficulty is comparatively large in the preparation, and the variation a little of technique will have an impact to absorbing property, simultaneously, improve the magnetic permeability of single M type ferrite, difficulty is also larger.If adopt the ferromagnetic metal powder absorption agent of higher magnetic permcability, although it has good temperature stability and higher saturation magnetization Ms, but because being limited to " skin effect ", granularity can not be too large under microwave frequency band for these ferromagnetic metal powder absorption agents, and require to be evenly distributed, volume fraction can not be excessive, therefore also limits the raising of its loading level.In addition, ferromagnetic metal material has heavy defect equally.
Therefore, in shielding material, be no matter single employing ferrite or ferromagnetic metal material and the simple composite between them, all cannot obtain lightweight, highly to fill, the shielding material of good effectiveness of shielding.Want to obtain and break through, need to innovate in the structure of shielding filler.Consider that the usable reflection of hertzian wave in screen layer is the essence reaching best shield effectiveness with absorbing, if the structure of filler can make hertzian wave multiple reflections and absorption in screen layer, reduce electric leakage leakage field, then it is contemplated that, shield effectiveness will improve greatly.Applicant finds utilizing hydrothermal method to prepare in the research of carbosphere, by controlling preparation technology, desirable conductive carbon spheroidal particle can be obtained, so, in the later stage that carbon spheroidal particle is formed, if introduce the W-type ferrite simultaneously with high saturation and magnetic intensity on surface, then can form a kind of new complex conductive fillers, with the screen layer that this filler is made, hertzian wave repeatedly reflection and absorption in filler particles can be made, reach good wave-absorbing effect.Thus constitute thinking of the present invention.
Summary of the invention
The object of the invention is to provide a kind ofly has the light composite material compared with strong electromagnetic function of shielding.
The technical solution used in the present invention is:
For a composite electromagnetic shield materials for power electronics cable, described composite electromagnetic shield materials primarily of mass ratio be 30 ~ 60: 40 ~ 70 electromagnetic shielding filler and thermoplastics make.
Described thermoplastics is the conventional thermoplastics for cable material in this area.Thermoplastics is a current consumption base polymer material widely, has the characteristic of thermoplastic, hardening by cooling, and namely when heating, deliquescing can be flowed, and hardening when cooling can be shaping, and this process can be carried out repeatedly.Be usually used in as insulation layer or the protective layer of isolating with external environment in power cable field, as polyethylene, polypropylene, polyvinyl chloride, polystyrene, nylon, polybutylene terephthalate (PBT) etc.The present invention adopts conventional polybutylene terephthalate.
Described electromagnetic shielding filler is the conductive carbon micro ball particle adopting hydrothermal method obtained, and meanwhile, this microsphere surface is enclosed with one deck Zn
2-W-type ferrite.Show through research, this complex microsphere can give full play to top layer Zn
2the electromagnetic wave absorption function of-W-type ferrite and the electromagnetic wave shielding function of center conductive carbosphere.Hertzian wave is absorbed by ferrite layer after the multiple reflections of carbosphere surface, reaches stronger effectiveness.Meanwhile, relative to traditional conductive metal shield material, because ferrite layer and carbosphere all have lower density, make this electromagnetic shielding material more lightweight.
Described composite conducting carbosphere particle size is 0.5 μm ~ 10 μm.
In order to ensure combination good between electromagnetic shielding filler and polybutylene terephthalate resin matrix, in described electromagnetic shielding material, also comprise the coupling agent that quality is described electromagnetic shielding filler quality 0.5% ~ 1%.
Described coupling agent is the conventional coupling agent for electromagnetic shielding material in this area, as silane coupling agent and titanate coupling agent etc., according to result of study of the present invention, find that the associativity of silane coupling agent and polybutylene terephthalate is better, therefore, the Silane coupling agent KH550 that in the present invention, preferred sexual valence is higher.
Described composite electromagnetic shield materials is prepared by following methods: the silane coupling agent adding 0.3 ~ 0.6 mass parts in the composite conducting carbosphere of 30 ~ 60 mass parts, with the polybutylene terephthalate mixed with resin of 70 ~ 40 mass parts through twin screw extruder mixing extrusion, melting temperature is 230 DEG C, obtains described composite electromagnetic shield materials.
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 ensureing plastic substrate good workability, there is lower density simultaneously, compared to traditional conductive metal filler, capability of electromagnetic shielding improves 20%, density reduces half, and has good flexibility, and the bending winding not affecting cable waits requirement.Require, in the field of electromagnetic shielding and flexible light weight, to there is good application prospect 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:
Surface is wrapped with Zn
2the preparation of the conductive carbon complex microsphere of-W-type ferrite: adopt hydrothermal method and low-temperature heat treatment to obtain and be coated with Zn
2the conductive carbon complex microsphere of-W-type ferrite.Using glucose as the precursor material of carbosphere, carry out for some time in hydrothermal reaction kettle after, add iron nitrate, zinc oxide, Strontium carbonate powder, proceed hydro-thermal reaction, generate the carbosphere of surface containing Fe, Zn, Sr, again this microballoon is heat-treated at 500 DEG C ~ 800 DEG C, make its surperficial Ferrite method and inner greying, obtain being coated with Zn
2the conductive carbon complex microsphere of-W-type ferrite.
The conductive carbon complex microsphere of acquisition is taken 300g, 400g, 450g, 500g, 550g, 600g, adds 3g, 4g, 4.5g, 5g, 5.5g, 6g silane coupling agent (model: KH550, Zhejiang Provincial Chemical Engineering Research Inst) respectively and carry out surface treatment.Mix with 700g, 600g, 550g, 500g, 450g and 400g polybutylene terephthalate after dry, then mixing extrusion on Small-size Twin-Screw Extruders forcing machine, melting temperature is 230 DEG C.The density of resulting materials 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 ".Measuring result shows, and within the scope of 1KHz ~ 1GHz, the effectiveness of shielding of sample is at more than 76dB, and maximum effectiveness of shielding reaches 85dB.Within the scope of 1GHz ~ 30GHz, the effectiveness of shielding of sample is at more than 35dB.
The performance of gained shielding material under the different loading level of table 1
Claims (3)
1. the composite electromagnetic shield materials for field of power electronics, described composite electromagnetic shield materials primarily of mass ratio be 30 ~ 60: 70 ~ 40 electromagnetic shielding filler and thermoplastics make, it is characterized in that described electromagnetic shielding filler is for being coated with Zn
2the conductive carbon complex microsphere particle of-W-type ferrite, wherein complex microsphere particle size is 0.5 μm ~ 10 μm.
2. composite electromagnetic shield materials as claimed in claim 1, is characterized in that described thermoplastics is polybutylene terephthalate.
3. composite electromagnetic shield materials as claimed in claim 1, is characterized in that described composite electromagnetic shield materials prepares by the following method: be wrapped with Zn on the surface of 30 ~ 60 mass parts
2add the silane coupling agent of 0.3 ~ 0.6 mass parts in the conductive composite microsphere of-W-type ferrite, through twin screw extruder mixing extrusion after mixing with the polybutylene terephthalate of 70 ~ 40 mass parts, obtain described composite electromagnetic shield materials.
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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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| CN102634177B true CN102634177B (en) | 2016-04-06 |
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| CN102945700B (en) * | 2012-10-31 | 2016-03-02 | 中国科学院长春光学精密机械与物理研究所 | A kind of military equipment self-control shielded type cable annex EMC film assembly |
| 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 |
| 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 |
| 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 |
| 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 |
| CN109991522A (en) * | 2019-04-12 | 2019-07-09 | 青岛科技大学 | A kind of test device and appraisal procedure for assessing semi-conductive shielding material emitting performance |
| CN110498998B (en) * | 2019-08-27 | 2021-12-24 | 宁波坚锋新材料有限公司 | Electromagnetic shielding engineering plastic with three-dimensional structure 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 |
| 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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| US4539433A (en) * | 1982-11-24 | 1985-09-03 | Tdk Corporation | Electromagnetic shield |
| CN101650977A (en) * | 2009-09-09 | 2010-02-17 | 湖南大学 | Nano iron oxide /graphite composite electromagnetic absorption material and preparation method thereof |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60173052A (en) * | 1984-02-20 | 1985-09-06 | Mitsui Toatsu Chem Inc | Resin composition |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4539433A (en) * | 1982-11-24 | 1985-09-03 | Tdk Corporation | Electromagnetic shield |
| CN101650977A (en) * | 2009-09-09 | 2010-02-17 | 湖南大学 | Nano iron oxide /graphite composite electromagnetic absorption material and preparation method thereof |
| 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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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 |