CN101085842A - Method for preparing electromagnetic shielding plastic master batch and composite plastic - Google Patents
Method for preparing electromagnetic shielding plastic master batch and composite plastic Download PDFInfo
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- CN101085842A CN101085842A CN 200610021121 CN200610021121A CN101085842A CN 101085842 A CN101085842 A CN 101085842A CN 200610021121 CN200610021121 CN 200610021121 CN 200610021121 A CN200610021121 A CN 200610021121A CN 101085842 A CN101085842 A CN 101085842A
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Abstract
The invention discloses a method for preparing a new type electromagnetic screen plastic master batch and complex plastic material, belonging to functional material field. The base resin material is added with high conductivity and high magnetic conductivity functional base material, the multiple layer combination idea is introduced for structure design, and the structural unit layer squence of fucntional electromagnetic screen plastic according to screen source character and screen purpos. The comprehensive electromagnetic screen effect is more than 38db. The invention is characterized by simple process, easy operation, wide application for product as electronic device shell material, and reduced electromagnetic wave irraditive pollution and electromagnetic signal leakage.
Description
(1) technical field: the present invention relates to the preparation method of novel electromagnetic shielding plastic master batch and composite plastic, function of dominant material technology field.
(2) background technology: also do not see the relevant patent report of novel electromagnetic shielding plastic master batch at present both at home and abroad with the composite plastic preparation method.The existing preparation method of the electromagnetic shielding plastic that research is more that reported adopts the method for mechanical blending, the mineral material that has filler such as carbon system, metal system, metal oxide, the low melting point alloy of high conductivity and high magnetic permeability and have a shielding properties is added in the polymeric matrix, make polymer matrix composite with better effectiveness.And multilayer complex functional plastics that granular filler, fiber, wire netting blend are made and functionally gradient plastics report seldom.Through inquiry, relate to 4 pieces of the patents of associated electrical magnetic shielding material abroad, report 6 pieces; 2 pieces of domestic patents are reported 4 pieces.These domestic and international patents and relevant report can be summarized as:
1, external aspect, the patent that Japan announced in 2004 is that mixing tourmalinite and porous material prepare electromagnetic shielding sheet material; U.S. Mobay chemical company develops the electromagnetic shielding plastic of a kind of Al filled polycarbonate, ABS compound, and when the Al volume content reached a value, its shielding properties was 45～65dB in 0.5～960MHz range of frequency; Japan artificial silk company of eastern nation adopts the chemical gaseous phase deposition method to deposit the nickel dam of 1 μ m at carbon fiber surface, use the modified polyphenylene ether resin coating again, be cut into the long staple fibre of 10mm then, mix with polystyrene, make the thick shielding material of 3mm, shield effectiveness is 40dB (500MHz); Japan has announced an electromagnetic shielding material patent in 1996, be with magnetite and amido ethyl formate mixed with resin, prepares a kind of electromagnetic shielding separator material; U.S. RTP company and cyanamide company have developed the shielding plastic that the nickel plating graphite fibre is filled respectively.It is that the nickel plating graphite fibre of 0.5 μ m is done filler that American Cyanamid Company adopts diameter 7 μ m thickness of coating, and high filler loading capacity 40% (weight) is filled ABS resin, makes shielding plastic.These plastics are when 1000MHz, and SE is well to shield the material material up to 80dB.
2, domestic aspect, announced a kind of electromagnetic shielding composite material and preparation method thereof in 2002, it contains porous material carrier and tourmaline particle, and the particle diameter of tourmaline particle is 0.3～10 micron, and the content of tourmalinite in shielding material is 5～30% (weight).This matrix material can be made into the shell of radiation household electrical appliances (as mobile phone, microwave oven) or as housing skin, also can be woven into the radioprotective cloth and make clothes, or make radiation shielding coating, because of its can with the airborne water generation negative ion that reacts, with in and the positively charged ion that sends of radiation object, and reduce or weaken harmful electromagnetic radiation; Announced a kind of electro-magnetic screen function polyolefin plastics master batch that has in 2004, it is characterized in that forming: polyolefin plastics 60～84% by following constituent and weight percent, contain the brilliant ore deposit of tourmalinite micro mist 5～15%, mineral filler 5～10%, dispersion agent 0.5～1%, aluminium powder 5～15%, it is described that to contain the brilliant ore deposit of tourmalinite micro mist be the tourmalinite breeze of high boron content, its chemical ingredients is the silicate that contains B, Al, Si, Mg, Mn, Zn, Ti, and its granularity is a submicron order.The advantage of this invention is to utilize to have the plastics energy shielding electromagnetic wave that electro-magnetic screen function polyolefin plastics master batch is made, the safety of the protection person and product; Dalian University of Technology studied with the doped polyaniline be filler, silicon rubber be matrix matrix material electroconductibility with and effectiveness of shielding under the 3-1500MHz frequency range.Result of study shows that along with the increase of polyaniline add-on, body resistivity obviously descends, and effectiveness of shielding is stable to be improved.When the adding weight ratio was 100: 100, effectiveness of shielding was at 16-19.3dB, and body resistivity and former rubber phase are than 12 orders of magnitude that descend; People such as the Shi Chunsheng of University Of Tianjin adopt plating Cu, Ni and Fe-Ni to coat polyacrylonitrile-radical, viscose glue base, asphalt base carbon fiber felt, and the PAN-based carbon fiber felt has electroconductibility preferably, is easy at its copper-depositing on surface, nickel and iron nickel alloy; Viscose-based carbon fiber felt poorly conductive, and hole is less, is difficult to obtain good coating with universal plating bath; The electroconductibility of asphalt base carbon fiber felt is best, is easy to deposit all kinds of metal plating; Sichuan University electromagnetic shielding material research department is coated with under inscription ancient type of banner hoisted on a featherdecked mast professor's the leader the member of Chinese Academy of Engineering, develops and satisfy the Ni-based electromagnetic shielding composite coating that GJB2604-96 " military electromagnetic screen coating general specification " requires in 10kHz～1GHz scope.
(3) summary of the invention:
1, design philosophy: according to the Schelkunoff principle of electromagnetic shield-ing, the available formula SE=R+A+B of shield effectiveness (SE) represents that R is electromagnetic reflection loss in the formula, and A is the absorption of electromagnetic wave loss, and B is the multipath reflection loss of hertzian wave in shielding material inside.Reflection loss R is charged particle and an electromagnetic field results of interaction in the material, and is relevant with the size of specific conductivity μ r/ magnetic permeability σ r, and conductivity of electrolyte materials is more little, and magnetic permeability is big more, and reflection loss is just more little; Absorption loss A is that the thermal losses that electric dipole or magneto-dipole and electromagnetic field effect produced in the material causes, after specific conductivity reached certain value, the absorbed loss that magnetic permeability is big was big more; The impedance of material and air impedance be approaching, mate when better, and hertzian wave is a little less than reflection on the interface, and most of hertzian wave passes the interface and is transmitted to the material the inside, and absorbed loss itself is not strong, so total electromagnetic wave attenuation is less; For two-layer or two-layer above shielding material, impedance matching situation between them and front and back built-up sequence thereof have a significant impact the final shielding properties of material.This research is starting point with the impedance matching that changes each layer reflection loss R, absorption loss A and material and air, several multilayer composite plastics with better capability of electromagnetic shielding of research preparation.The high-conductivity filler is added in the resin matrix, improved the specific conductivity of plastics sheet, reflection loss R is increased; Add the high magnetic permeability filler and improve absorption loss; When a wire netting sandwich of layers being arranged in the middle of two plastic tabs or when being prepared into the multilayered structure shielding plastic, be equivalent to more than material internal a plane of reflection, reflection loss will mainly take place in hertzian wave on the interface, solved material between impedance and mate similar problem.
2, goal of the invention: the present invention adopts the method for mechanical blending to prepare a kind of have electroconductibility height, strong adhesion, wear resistance is good, moulding process is easy, with low cost novel electromagnetic shielding plastics.Under study for action by change filling kind, grain through size, fiber length through than, wire netting space, multiple layer combination sequential scheduling parameter, obtain preparing the optimum technology parameter of novel electromagnetic shielding plastics, for industrialization prepares the service of novel electromagnetic shielding plastics.
3, technological line:
The first step: the different choice function of shielding primitive filler according to shielding purpose and shielding mode, then, function of shielding primitive filler is carried out pre-treatment, remove the organism and the impurity on surface, reach activation and increase the long-pending purpose of filling surface.Second step: on the first step basis, function of shielding primitive filler is carried out coupling agent (titanate coupling agent, silane coupling agent) surface modification treatment.The 3rd step: on the second step basis, preparation shielding master batch.The proportioning of carrying out to filler/resin is calculated, and extrudes at forcing machine by the filler/resin matrix of a certain amount of proportioning, will extrude-granulation-extrude this process and repeat repeatedly, and filler relatively is evenly dispersed in the resin matrix.The 4th step: on the 3rd step basis, the preparation plastic tab.Well-mixed plastic matrix is pressed into the plastics sheet materials of certain thickness and size under certain pressure.The 5th step: on the basis in the 4th step, the functionally gradient shielding composite plastic of preparation multilayered structure, plastic tab/wire netting/plastic tab multilayered structure shielding composite plastic, plastic tab/plastic tab multilayered structure shielding composite plastic and preparation plastic tab/functional paint (preparation in advance) shielding composite plastic.The 5th step: on the basis of above step, the multilayer screen composite plastic for preparing is carried out performance test.
4, innovative point of the present invention: the plastics technology of preparing in the traditional technology is attached to molding process, formed the special shielding plastic fabricating technology of autonomous research, reduced the cost input like this, shortened technical process, its prepared electromagnetic shielding plastic has characteristics such as electroconductibility height, shield effectiveness is good, density is little, and its synthetic technology is being represented the developing direction that material is synthetic and prepare; When adopting that the mechanical blending method is synthetic to have more excellent shielding properties novel electromagnetic shielding plastics,, make high conductivity, high magnetic permeability filler uniform distribution in resin matrix by to processing such as filler high-temperature activation, surface modifications; Multiple filler uses jointly, taken into full account use single filler contact area few, be not easy the dispersive shortcoming.In addition, structurally the thought of multiple layer combination is adopted in design, be equivalent to material internal many many several plane of reflection, reflection loss will mainly take place in hertzian wave on a little interfaces.
5, Application Areas: along with electronic industry, developing rapidly of information technology, electromagnetic side effect is obvious day by day, the normal running of the reception of electromagnetic radiation TV and telediffusion, medical treatment device and air equipment, even having influence on the healthy of people, hertzian wave pollutes has become the focus that people pay close attention to.Because the novel electromagnetic shielding plastics have good processability, physical and mechanical properties, economic performance and environmental protection effect, and electromagnetic radiation shielding effectively, utilization widely obtained in recent years in dual-use field.The novel electromagnetic shielding plastics are mainly used in and prevent that military, civilian electromagnetic signal from leaking, giving away secrets and mutually on the interferential protection question, and civilian electromagnetic pollution is limited within the specific limits, with the pollution of minimizing to human body; In addition, the plain plastics of electromagnetic shielding can also be widely used in the anti-electromagnetic shielding industries such as printed circuit board (PCB), thin film switch, thick film integrated circuit, liquid-crystal display, television cabin, full dynamic formula membrane keyboard and decorative art panel.
(4) embodiment:
1, the modification of raw material is handled: carbon black, graphite pre-treatment, treating method are under the protection of inert gas atmosphere it to be heated 20min under 800 ℃ high temperature, and this treatment process can be removed the organism on surface, and reach the purpose of activation carbon black, graphite; The pre-treatment of carbon fiber, sodium chlorate and sulfuric acid mixed solution thermooxidizing carbon fiber are adopted in this research, handle in the carbon fiber immersion silane coupling agent KH550 solution with oxidation again.Perhaps adopt nitric acid thermooxidizing carbon fiber, further process with the carbon fiber of titanate coupling agent after then oxidation.The carbon fiber that these two kinds of methods are handled is more effective than single oxidation style with the avidity of resin; The wire netting pre-treatment mainly is that degreasing and rust removal is handled, and treating method is difference functional quality mark 4%～6%NaOH and HCl solution-treated, and is standby with the clean dry back of flushing with clean water then; The pretreated purpose of resin matrix mainly is to remove resin to inhale the moisture that (ABS etc.) receive, because most of resins contain strong polar groups such as cyano group, water-absorbent is bigger, and the reply resin carries out drying treatment before the processing, makes its water content below 0.2%.This research and utilization microwave oven drying is no more than 60mm at granulosa thickness, and temperature is dry 1.5h between 100～120 ℃ the time.
2, the preparation of shielding plastic master batch: with pretreated function of shielding primitive filler, resin matrix thorough mixing according to a certain percentage, under certain processing condition, the form by changing the used functional motif filler of preparation shielding masterbatch (grain through size, long through than), the serial function of shielding master batches of relation preparation such as kind, content and proportioning.
3, MULTILAYER COMPOSITE shielding plastic preparation: shielding plastic masterbatch (12MPa) under certain pressure is pressed into the plastic tab of pre-determined thickness (or by changing the proportion relation of filler, be prepared into the functionally gradient composite plastic of multilayered structure), plastic tab is made up with wire netting, paint with electromagnetic shielding function, tinsel respectively, under certain processing condition, be prepared into multilayered structure electromagnetic shielding composite plastic.
4, specific embodiment: (1) electrical conductor plastic master batch/strong magnetic wire netting/electrical conductor plastic master batch series:
Proportion relation between the electrical conductor plastic master batch filler
| The embodiment numbering | Weight percentage (wt%) | ||
| Carbon black | Carbon fiber | Stainless Steel Fibre | |
| 1 | 100 | 0 | 0 |
| 2 | 0 | 100 | 0 |
| 3 | 0 | 0 | 100 |
| 4 | 70 | 30 | 0 |
| 5 | 40 | 0 | 60 |
| 6 | 50 | 50 | 0 |
| 7 | 30 | 60 | 10 |
| 8 | 40 | 40 | 20 |
| 9 | 50 | 20 | 30 |
Kicker magnet: adopt iron net, nickel screen, iron-nickel alloy net.
(2) kicker magnet plastic master batch/electrical conductor wire netting/kicker magnet plastic master batch series:
Proportion relation between the kicker magnet plastic master batch filler
| The embodiment numbering | Weight percentage (wt%) | ||
| Carbon black | Iron powder | Nickel powder | |
| 1 | 100 | 0 | 0 |
| 2 | 0 | 100 | 0 |
| 3 | 0 | 0 | 100 |
| 4 | 70 | 30 | 0 |
| 5 | 40 | 0 | 60 |
| 6 | 50 | 50 | 0 |
| 7 | 30 | 60 | 10 |
| 8 | 40 | 40 | 20 |
| 9 | 50 | 20 | 30 |
Electrical conductor: adopt 100# red copper net, stainless (steel) wire and 50# brass screen, stainless (steel) wire.
(3) kicker magnet plastic master batch/electrical conductor plastic master batch series:
Proportion relation between the kicker magnet plastic master batch filler
| The embodiment numbering | Weight percentage (wt%) | ||
| Iron powder | Nickel powder | Stainless Steel Fibre | |
| 1 | 100 | 0 | 0 |
| 2 | 0 | 100 | 0 |
| 3 | 0 | 0 | 100 |
| 4 | 70 | 30 | 0 |
| 5 | 40 | 0 | 60 |
| 6 | 50 | 50 | 0 |
| 7 | 30 | 60 | 10 |
| 8 | 40 | 40 | 20 |
| 9 | 50 | 20 | 30 |
Proportion relation between the electrical conductor plastic master batch filler
| The embodiment numbering | Weight percentage (wt%) | ||
| Graphite | The charcoal fiber | Stainless Steel Fibre | |
| 1 | 100 | 0 | 0 |
| 2 | 0 | 100 | 0 |
| 3 | 0 | 0 | 100 |
| 4 | 70 | 30 | 0 |
| 5 | 40 | 0 | 60 |
| 6 | 50 | 50 | 0 |
| 7 | 30 | 60 | 10 |
| 8 | 40 | 40 | 20 |
| 9 | 50 | 20 | 30 |
(4) functionally gradient electromagnetic shielding plastic series (the high electromagnetic shielding plastic that absorbs of low reflection)
Experimental formula
| The embodiment numbering | Weight percentage (wt%) | ||
| Nickel | Zinc-ferrite | Matrix (resin) | |
| 1 | 80 | 0 | 20 |
| 2 | 65 | 15 | 20 |
| 3 | 44 | 36 | 20 |
| 4 | 36 | 44 | 20 |
| 5 | 15 | 65 | 20 |
| 6 | 0 | 80 | 20 |
Structure design
| Specimen coding | Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | Sample 6 | ||
| Thickness (unit millimeter) | Impedance matching layer | 5 | 0.5 | 0.2 | 0.1 | 0.01 | 0.02 | |
| The impedance transition zone | 4 3 2 1 | 0.5 0.5 0.5 0.5 | 0.2 0.2 0.2 0.2 | 0.1 0.1 0.1 0.1 | 0.01 0.01 0.01 0.01 | 0.02 0.02 0.02 0.02 | ||
| High absorbing area | 0 | 3 | 0.5 | 1 | 2 | 2.9 | 2.9 | |
| The impedance transition zone | 1 2 3 4 | 0.2 0.2 0.2 0.2 | 0.1 0.1 0.1 0.1 | 0.01 0.01 0.01 0.01 | ||||
| Impedance matching layer | 5 | 0.2 | 0.1 | 0.01 | ||||
(5) proportion relation of shielding coating/electrical conductor or kicker magnet plastic master batch/shielding coating series function shielding coating filler
| The embodiment numbering | Weight percentage (wt%) | ||
| Graphite | Magnetite | Nickel powder | |
| 1 | 100 | 0 | 0 |
| 2 | 0 | 100 | 0 |
| 3 | 0 | 0 | 100 |
| 4 | 60 | 40 | 0 |
| 5 | 40 | 0 | 60 |
| 6 | 50 | 50 | 0 |
| 7 | 30 | 60 | 10 |
| 8 | 40 | 40 | 20 |
| 9 | 50 | 20 | 30 |
(6) paste tinsel/electrical conductor or kicker magnet plastic master batch series
Pasting the tinsel shielding plastic is with aluminium foil, Copper Foil, and iron foil and electrical conductor or kicker magnet plastic tab bond together compression moulding then earlier with tackiness agent.(plastic tab adopts the prescription series of (1)～(3)).
Preparation novel electromagnetic shielding plastics described in the embodiment of the invention use the granularity of electromagnetic shielding primitive filler at 50～220 orders; Fibre diameter is 7 μ m, long 2～5mm; The wire netting that described preparation novel electromagnetic shielding plastics are used adopts 100# red copper net, stainless (steel) wire and 50# brass screen, stainless (steel) wire, iron net, nickel screen, mesh eye size 2～3 μ m, and the twine thickness is 0.5～1 μ m.
By the electromagnetic shielding composite plastic of above embodiment preparation, its comprehensive effectiveness reaches the above (1MHz～1.8GHz) of 38dB (dB).
Can prepare the product that reaches the object of the invention by the foregoing description batching and according to aforementioned production method.
The embodiment of the inventive method all can specifically implement, and is not limited to above embodiment.
Claims (10)
1, the preparation method of a kind of novel electromagnetic shielding plastic master batch and composite plastic is characterized in that, at first selects different function of shielding primitive fillers according to difference shielding purpose; Then function of shielding primitive functional stuffing is carried out surface impurity and remove processing; Then the functional motif filler is carried out the coupling agent surface modification treatment; According to the proportioning of shield element functional stuffing, prepare shielding plastic master batch and multilayer functionally gradient composite plastic two-layer, that multilayered structure shields composite plastic and the high absorption of low reflection at last.
2, the preparation method of novel electromagnetic shielding plastic master batch according to claim 1 and composite plastic, it is characterized in that, the preparation of described shielding plastic master batch, will be by proportioning blended functional motif filler/resin matrix, repeat repeatedly to be extruded into the shielding plastic master batch by forcing machine, and the granulating processing parameter is set according to filler and resin matrix characteristic.
3, the preparation method of novel electromagnetic shielding plastic master batch according to claim 1 and composite plastic, it is characterized in that, the preparation of described multilayer screen composite plastic, the shielding plastic master batch is depressed to the plastic tab of pre-determined thickness at pressing machine, again plastic tab respectively with wire netting, tinsel, function of shielding coating combined preparation MULTILAYER COMPOSITE shielding plastic.
4, the preparation method of novel electromagnetic shielding plastic master batch according to claim 1 and composite plastic, it is characterized in that, the preparation of the high multilayer functionally gradient composite plastic that absorbs of described low reflection, by changing the prescription of preparation shielding plastic master batch filler, the high multilayer functionally gradient composite plastic that absorbs of the low reflection of preparation.
5, the preparation method of novel electromagnetic shielding plastic master batch according to claim 1 and composite plastic, it is characterized in that, the kind of the functional motif filler that described preparation shielding plastic order grain is used, particle grain through size, fiber length through than the proportioning between, content and the filler.
6, the preparation method of novel electromagnetic shielding plastic master batch according to claim 1 and composite plastic is characterized in that, described preparation shielding plastic master batch kind choose and the weight percentage of each component in matrix is:
1), carbon fiber: 0～100%;
2), carbon black: 0～100%;
3), Stainless Steel Fibre: 0～100%;
4), iron powder, nickel powder: 0～100%;
5), iron net, nickel screen, iron-nickel alloy net: 0～100%;
6), zinc-ferrite; 0～100%;
7), graphite: 0～100%;
8), tinsel: 0～100%;
9), magnetite: 0～100%;
10), coupling agent: 2～3%.
11) resin matrix 20%～50%.
7, the preparation method of novel electromagnetic shielding plastic master batch according to claim 1 and composite plastic is characterized in that, used functional motif characteristic; Function of shielding primitive filler under reducing atmosphere, is warming up to 800 ℃ of heating 20min; The wire netting pre-treatment, functional quality mark 4%～6%NaOH and HCl solution-treated, clean with flushing with clean water then, drying; Plastic resin treatment is utilized the microwave oven drying, is no more than 60mm at granulosa thickness, and temperature is dry 1.5h between 100～120 ℃ the time.
8, the preparation method of novel electromagnetic shielding plastic master batch according to claim 1 and composite plastic is characterized in that, the built-up sequence between the multilayered structure shielding composite plastic layer, and the built-up sequence between its layer is determined by shielding source and shielding mode.
9, the preparation method of novel electromagnetic shielding plastic master batch according to claim 3 and composite plastic, it is characterized in that used wire netting is 100# copper mesh, stainless (steel) wire, iron net, nickel screen, iron-nickel alloy net and 50# copper mesh, stainless (steel) wire, iron net, nickel screen, iron-nickel alloy net etc.; Width of mesh is 2～3 μ m; The twine thickness is 0.5～1 μ m; Metal foil thickness is 0.5～1mm.
10, the preparation method of described novel electromagnetic shielding plastic master batch of claim 4 and composite plastic, it is characterized in that, described modular construction layer is made up of impedance matching layer, the excessive layer of impedance, high absorption layer, and the composition of modular construction layer and prescription are determined by impedance matching between the layer and consistency.
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| CN102206371A (en) * | 2011-04-08 | 2011-10-05 | 青岛科技大学 | Reclaimed rubber composite material with electromagnetic shielding performance and preparation method thereof |
| CN102206365A (en) * | 2011-04-08 | 2011-10-05 | 青岛科技大学 | Rubber powder composite material with electromagnetic shielding effectiveness, and preparation method thereof |
| CN101838470B (en) * | 2009-12-02 | 2012-06-27 | 上海科斗电子科技有限公司 | Electromagnetic shielding plastic |
| CN102964899A (en) * | 2012-11-14 | 2013-03-13 | 马鞍山绿盾防护材料科技有限公司 | Low-reflectivity high-efficiency electromagnetic shielding material |
| CN105385035A (en) * | 2015-12-16 | 2016-03-09 | 苏州知瑞光电材料科技有限公司 | Conductive PP film and preparation method thereof |
| CN106231885A (en) * | 2016-08-13 | 2016-12-14 | 深圳市超梦智能科技有限公司 | Guidance path display packing |
| CN108912670A (en) * | 2018-07-23 | 2018-11-30 | 山东大学 | A kind of suction wave functionally gradient material (FGM) and preparation method thereof based on increases material manufacturing technology |
| CN108939851A (en) * | 2018-09-25 | 2018-12-07 | 张�诚 | A kind of the superparamagnetic field magnetic solution processor and its processing method of organic exhaust gas |
| CN109390324A (en) * | 2017-08-11 | 2019-02-26 | 三星电子株式会社 | Semiconductor packages and its manufacturing method |
| CN111621072A (en) * | 2019-02-28 | 2020-09-04 | 纳米Emi有限责任公司 | Composite material for shielding electromagnetic radiation, raw material for additive manufacturing method, product comprising the composite material and manufacturing method thereof |
| CN112218512A (en) * | 2020-08-31 | 2021-01-12 | 河南工程学院 | Polymer-based electromagnetic shielding composite material with gradient structure and preparation method thereof |
| CN112888288A (en) * | 2021-01-18 | 2021-06-01 | 哈尔滨工业大学 | Electromagnetic shielding curved surface optical window based on ultrathin doped metal/medium composite structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101838470B (en) * | 2009-12-02 | 2012-06-27 | 上海科斗电子科技有限公司 | Electromagnetic shielding plastic |
| CN102206371A (en) * | 2011-04-08 | 2011-10-05 | 青岛科技大学 | Reclaimed rubber composite material with electromagnetic shielding performance and preparation method thereof |
| CN102206365A (en) * | 2011-04-08 | 2011-10-05 | 青岛科技大学 | Rubber powder composite material with electromagnetic shielding effectiveness, and preparation method thereof |
| CN102964899A (en) * | 2012-11-14 | 2013-03-13 | 马鞍山绿盾防护材料科技有限公司 | Low-reflectivity high-efficiency electromagnetic shielding material |
| CN105385035A (en) * | 2015-12-16 | 2016-03-09 | 苏州知瑞光电材料科技有限公司 | Conductive PP film and preparation method thereof |
| CN106231885B (en) * | 2016-08-13 | 2018-12-14 | 深圳市超梦智能科技有限公司 | Guidance path display methods |
| CN106231885A (en) * | 2016-08-13 | 2016-12-14 | 深圳市超梦智能科技有限公司 | Guidance path display packing |
| CN109390324A (en) * | 2017-08-11 | 2019-02-26 | 三星电子株式会社 | Semiconductor packages and its manufacturing method |
| CN109390324B (en) * | 2017-08-11 | 2024-01-05 | 三星电子株式会社 | Semiconductor package and method of manufacturing the same |
| CN108912670A (en) * | 2018-07-23 | 2018-11-30 | 山东大学 | A kind of suction wave functionally gradient material (FGM) and preparation method thereof based on increases material manufacturing technology |
| CN108939851A (en) * | 2018-09-25 | 2018-12-07 | 张�诚 | A kind of the superparamagnetic field magnetic solution processor and its processing method of organic exhaust gas |
| CN111621072A (en) * | 2019-02-28 | 2020-09-04 | 纳米Emi有限责任公司 | Composite material for shielding electromagnetic radiation, raw material for additive manufacturing method, product comprising the composite material and manufacturing method thereof |
| CN115707335A (en) * | 2020-05-20 | 2023-02-17 | 摩康复合材料公司 | Additive and/or additive-additive combination for incorporation, thermoplastic synthetic material comprising same, and use of synthetic material |
| CN112218512A (en) * | 2020-08-31 | 2021-01-12 | 河南工程学院 | Polymer-based electromagnetic shielding composite material with gradient structure and preparation method thereof |
| CN112888288A (en) * | 2021-01-18 | 2021-06-01 | 哈尔滨工业大学 | Electromagnetic shielding curved surface optical window based on ultrathin doped metal/medium composite structure |
| CN112888288B (en) * | 2021-01-18 | 2022-10-28 | 哈尔滨工业大学 | Electromagnetic shielding curved surface optical window based on ultrathin doped metal/medium composite 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 |
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