CN100518481C - Metal fiber/polymer compound electromagnetic shielding material and its making method - Google Patents
Metal fiber/polymer compound electromagnetic shielding material and its making method Download PDFInfo
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- CN100518481C CN100518481C CNB2007101219980A CN200710121998A CN100518481C CN 100518481 C CN100518481 C CN 100518481C CN B2007101219980 A CNB2007101219980 A CN B2007101219980A CN 200710121998 A CN200710121998 A CN 200710121998A CN 100518481 C CN100518481 C CN 100518481C
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Abstract
A metal fibre/ polymer composite electromagnetic shielding material and the preparation method of the material relates to a functional composite material of shielding the interfering of electromagnetic wave. The invention consists of electromagnetic shielding components that are compositely formed by metal fibre and conducting polymer and a resin matrix. The preparation method includes the cutting of the metal fibre and acquiring the electromagnetic shielding material through ball milling by mixing the metal fibre with the conducting polymer and the resin mechanically. As the invention makes use of the metal fibre as the metal jointing to replace metal powder and the metal fibre has a certain slenderness ratio which is more beneficial to forming a conducting network, the invention plays a remarkable role on reducing cost as well as the weight of the electromagnetic shielding material. The composition of the metal fibre and polymer increases the bandwidth of shielding efficiency and can acquire a higher shielding efficiency in a wider frequency range. Adopting different metal fibre assemblies or alloy fibre can design the electromagnetic performances of the metal fibre conducting network .and increase the absorption loss in shielding efficiency thereby reducing the secondary pollution caused by reflection. The method has the advantages of easy preparation and operation.
Description
Technical field
The present invention relates to the electro-magnetic screen function composite material, be used for shielding electromagnetic wave and disturb.
Background technology
Along with the progress of electronic technology and electronic equipment, electromagnetic wave need obtain administering to the normal use and the harm of human beings'health ground of electronic equipment.Electromagnetic shielding material is effectively to administer electromagnetic harm, the important means that shielding electromagnetic wave is disturbed.At present the composite electromagnetic screen coating of research and development all is to be main electrically-conducting paint with spherical metal dust.Reported among the disclosed Chinese patent 03121536.X on September 10th, 2003 " organic/inorganic composite electromagnetic wave absorbent curtain coating material " that a kind of organic/inorganic composite electromagnetic suction involves the formation pattern of shielding coating.Disclosed on March 23rd, 2005 among the Chinese patent 1597308A " a kind of organic/inorganic multilayer hybrid circuit structure, the preparation method of shielding material " and described the simple preparation method of direct mixing, absorbed and screening effectiveness but need utilize MULTILAYER COMPOSITE to improve.Above-mentioned two patents all are to utilize metal dust as main conductive filler.Because the spherical feature of metal dust, be difficult for forming conductive network, so the percetage by weight of often having relatively high expectations is obtained desired conductive network and screening effectiveness, generally speaking the content of its metal dust of screening effectiveness often requires to reach 50% percetage by weight in order to obtain preferably.And for the use of metallic fiber, only have at present and utilize stainless steel fibre to make the research of conductive plastics.According to the research " performance study of LDPE-stainless steel fibre electromagnetic shielding material " of Beijing Institute of Technology and the introduction of documents such as " stainless steel fibre are filled thermoplastic conductive plastics progress ", all be to use stainless steel fibre to produce conductive plastics by mixing and injection moulding.See that from present result this class research often can only make the conductive plastics anti-static product, its screening effectiveness is also lower, and manufacture craft and technology more complicated, is difficult to control.For utilizing metallic fiber not appear in the newspapers as yet as conductive filler combines preparation composite electromagnetic screen coating with conducting polymer work.
Summary of the invention
The present invention proposes and utilize metallic fiber, with conducting polymer and mixed with resin and obtain efficient lightweight composite electromagnetic shield materials composition proportion and preparation method.This method technology is simple, is easy to control also to access the shielding material with higher screening effectiveness.
The present invention is made up of metallic fiber and compound electromagnetic shielding component and the resin matrix of forming of conducting polymer, and the percetage by weight of metallic fiber in shielding material is 1 to 50%, and the percetage by weight of conducting polymer is 0.5 to 40%, and all the other are resin matrix.The metallic fiber diameter range that adopts is at 5 to 30 microns, and the length range of fiber is at 0.1 to 1 millimeter.The resistance of the conducting polymer that adopts should be less than 100 Europe.
Metallic fiber can be the combination or the alloy fiber of single simple metal fiber or multiple metallic fiber.
The preparation method of metallic fiber/conducting polymer composite electromagnetic shield materials that the present invention proposes clips to metallic fiber 0.1 to 1 millimeter length, directly carry out mechanical mixture with conducting polymer and reisn base material, after the ball mill ball milling is more than 10 minutes, obtain electromagnetic shielding material.
Compared with prior art, the present invention is owing to utilize metallic fiber to come the substituted metal powder as metallic stuffing, and metallic fiber has certain draw ratio, help forming conductive network more, so can use more a spot of metallic fiber to reach the purpose that forms conductive network and obtain desired screening effectiveness, have remarkable effect for the weight that reduces cost with electromagnetic shielding material.The compound bandwidth that increases screening effectiveness of metallic fiber and polymer can obtain higher screening effectiveness in wider frequency.Adopt different metal fiber combinations or alloy fiber can design the electromagnetic performance of metal fibre conductive network simultaneously, increase the absorption loss in the screening effectiveness, thereby reduce the secondary pollution that reflection causes.It is simple to utilize metallic fiber to prepare electromagnetic shielding material technology, easy operating.
Owing to can select the combination (multiple metallic fiber combination) or the alloy fiber of different metallic fiber (single simple metal fiber) or metallic fiber for use, can satisfy the effect of high screening effectiveness and high absorption loss and reduce reflection loss, thereby reach the purpose of low secondary pollution.In screening component, select for use conducting polymer can improve the screening effectiveness of high-frequency band.
Building masonry wall, electronic equipment casing and other occasions that need shield that this applying material is shielded at needs, when coating layer thickness is the 0.2-0.4 millimeter, the metallic fiber amount reaches 15% when above, can reach more than the 60dB in the frequency range inner shield usefulness of 30MHz-1500MHz.
Embodiment
Embodiment 1: selecting diameter for use is 12 microns austenite (304) stainless steel fibre, and hammer-shears is cut into the short fiber of 1 millimeter.Select the electrically conductive polyaniline that utilizes the DBSA secondary doping for use, its sheet resistance is the solvent that 2 Europe and acrylic resin matrix constitute electromagnetic screen coating.With percetage by weight is that 10% stainless steel fibre and percetage by weight are after 4% electrically conductive polyaniline and percetage by weight are 86% acrylic resin mechanical mixture, is placed in the ball mill ball milling and makes electromagnetic screen coating in 1 hour.It is to be used to test screening effectiveness on 115 millimeters the resin substrate that shielding coating is coated in diameter.The thickness of coating is 0.4 millimeter.This sample its screening effectiveness in the frequency range of 30MHz-1500MHz reaches more than the 45dB after tested.
Embodiment 2: selecting diameter for use is 11 microns ferrite (430) stainless steel fibre, and hammer-shears is cut into the short fiber of 0.6 millimeter.Select the electrically conductive polyaniline that utilizes the DBSA secondary doping for use, its sheet resistance is the solvent that 2 Europe and acrylic resin matrix constitute electromagnetic screen coating.With weight fraction is that 10% stainless steel fibre and weight fraction are after 4% electrically conductive polyaniline and weight fraction are 86% acrylic resin mechanical mixture, is placed in the ball mill ball milling and makes electromagnetic screen coating in 15 minutes.It is to be used to test screening effectiveness on 115 millimeters the resin substrate that shielding coating is coated in diameter.The thickness of coating is 0.4 millimeter.This sample its screening effectiveness in the frequency range of 30MHz-1500MHz reaches more than the 40dB after tested.
Embodiment 3: selecting diameter for use is 11 microns ferrite (430) stainless steel fibre, and hammer-shears is cut into the short fiber of 0.6 millimeter.Select the electrically conductive polyaniline that utilizes the DBSA secondary doping for use, its sheet resistance is the solvent that 2 Europe and acrylic resin matrix constitute electromagnetic screen coating.With weight fraction is that 25% stainless steel fibre and weight fraction are after 5% electrically conductive polyaniline and weight fraction are 70% acrylic resin mechanical mixture, is placed in the ball mill ball milling and makes electromagnetic screen coating in 2 hours.It is to be used to test screening effectiveness on 115 millimeters the resin substrate that shielding coating is coated in diameter.The thickness of coating is 0.4 millimeter.This sample its screening effectiveness in the frequency range of 30MHz-1500MHz reaches more than the 60dB after tested.
Embodiment 4: selecting diameter for use is 20 microns Ni metallic fiber, and hammer-shears is cut into the short fiber of 0.5 millimeter.Select the electrically conductive polyaniline that utilizes the HCL secondary doping for use, its sheet resistance is the solvent that 30 Europe and acrylic resin matrix constitute electromagnetic screen coating.With weight fraction is that 20% metal Ni fiber and weight fraction are after 5% electrically conductive polyaniline and weight fraction are 75% acrylic resin mechanical mixture, is placed in the ball mill ball milling and makes electromagnetic screen coating in 1 and a half hours.It is to be used to test screening effectiveness on 115 millimeters the resin substrate that shielding coating is coated in diameter.The thickness of coating is 0.4 millimeter.This sample its screening effectiveness in the frequency range of 30MHz-1500MHz reaches more than the 40dB after tested.
Embodiment 5: selecting diameter for use is the stainless steel fibre that 20 microns Ni metallic fiber and diameter are 12 microns, and hammer-shears is cut into the short fiber of 0.6 millimeter.Select the electrically conductive polyaniline that utilizes the HCL secondary doping for use, its sheet resistance is the solvent that 30 Europe and acrylic resin matrix constitute electromagnetic screen coating.It with weight fraction 10% metal Ni fiber, weight fraction is that 10% stainless steel fibre and weight fraction are that 5% electrically conductive polyaniline and weight fraction are after 75% the acrylic resin mechanical mixture, is placed in the ball mill ball milling and makes electromagnetic screen coating in 1 hour.It is to be used to test screening effectiveness on 115 millimeters the resin substrate that shielding coating is coated in diameter.The thickness of coating is 0.4 millimeter.This sample its screening effectiveness in the frequency range of 30MHz-1500MHz reaches more than the 55dB after tested.
Claims (5)
1, a kind of metal fiber/polymer compound electromagnetic shielding material, it is characterized in that, this composite electromagnetic shield materials is made up of metallic fiber and compound electromagnetic shielding component and the resin matrix of forming of conducting polymer, the percetage by weight of metallic fiber in shielding material is 1 to 50%, the percetage by weight of conducting polymer is 0.5 to 40%, and all the other are resin matrix.
2, metal fiber/polymer compound electromagnetic shielding material as claimed in claim 1 is characterized in that, the metallic fiber diameter range is at 5 to 30 microns, and the length range of fiber is at 0.1 to 1 millimeter.
3, metal fiber/polymer compound electromagnetic shielding material as claimed in claim 1 is characterized in that, the resistance of conducting polymer is less than 100 Europe.
4, metal fiber/polymer compound electromagnetic shielding material as claimed in claim 2 is characterized in that, metallic fiber is the combination or the alloy fiber of single simple metal fiber or multiple metallic fiber.
5, the preparation method of the described metal fiber/polymer compound electromagnetic shielding material of claim 1, it is characterized in that, directly carry out mechanical mixture with conducting polymer and reisn base material after metallic fiber clipped to desired length, form electromagnetic shielding material in the back more than 10 minutes at the ball mill ball milling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101219980A CN100518481C (en) | 2007-09-19 | 2007-09-19 | Metal fiber/polymer compound electromagnetic shielding material and its making method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101219980A CN100518481C (en) | 2007-09-19 | 2007-09-19 | Metal fiber/polymer compound electromagnetic shielding material and its making method |
Publications (2)
| Publication Number | Publication Date |
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| CN101123864A CN101123864A (en) | 2008-02-13 |
| CN100518481C true CN100518481C (en) | 2009-07-22 |
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| CNB2007101219980A Expired - Fee Related CN100518481C (en) | 2007-09-19 | 2007-09-19 | Metal fiber/polymer compound electromagnetic shielding material and its making method |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8494620B2 (en) * | 2008-06-18 | 2013-07-23 | Koninklijke Philips Electronics N.V. | Electrocardiograph for magnetic resonance imaging and electrode patch for same |
| CN101838470B (en) * | 2009-12-02 | 2012-06-27 | 上海科斗电子科技有限公司 | Electromagnetic shielding plastic |
| CN101914296B (en) * | 2010-08-04 | 2012-07-04 | 上海交通大学 | Metal fiber reinforced polymeric matrix composite material and preparation method thereof |
| US9229029B2 (en) * | 2011-11-29 | 2016-01-05 | Formfactor, Inc. | Hybrid electrical contactor |
| CN104072807B (en) * | 2014-06-25 | 2017-09-22 | 无锡水木清华国珍科技有限公司 | A kind of nickel metallic fiber and the compound electromagnetic shielding plastic masterbatch of stainless steel metal fibre and preparation method thereof |
| CN111403080A (en) * | 2020-03-24 | 2020-07-10 | 东莞讯滔电子有限公司 | Cable and manufacturing method thereof |
-
2007
- 2007-09-19 CN CNB2007101219980A patent/CN100518481C/en not_active Expired - Fee Related
Non-Patent Citations (4)
| Title |
|---|
| 聚合物基电磁屏蔽复合材料. 杜仕国等.磁性材料及器件，第31卷第5期. 2000 |
| 聚合物基电磁屏蔽复合材料. 杜仕国等.磁性材料及器件，第31卷第5期. 2000 * |
| 金属纤维填充聚合物复合材料的导电性能和电磁屏蔽性能. 谭松庭等.材料工程，第12期. 1999 |
| 金属纤维填充聚合物复合材料的导电性能和电磁屏蔽性能. 谭松庭等.材料工程，第12期. 1999 * |
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| CN101123864A (en) | 2008-02-13 |
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Effective date of registration: 20091023 Address after: Beijing, Xueyuan Road, Haidian District No. 30: 100083 Co-patentee after: Anhui University of Technology Patentee after: University of Science and Technology Beijing Address before: Beijing, Xueyuan Road, Haidian District No. 30: 100083 Patentee before: University of Science and Technology Beijing |
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