CN1364052A - Composite material for electromagnetic shielding - Google Patents
Composite material for electromagnetic shielding Download PDFInfo
- Publication number
- CN1364052A CN1364052A CN 01100150 CN01100150A CN1364052A CN 1364052 A CN1364052 A CN 1364052A CN 01100150 CN01100150 CN 01100150 CN 01100150 A CN01100150 A CN 01100150A CN 1364052 A CN1364052 A CN 1364052A
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- China
- Prior art keywords
- tourmaline
- electromagnetic shielding
- shielding material
- radiation
- electromagnetic
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Abstract
The invention discloses an electromagentic shielding material that contains carrier of porous material and granules of tourmaline whose content is 5-30% (weight) in the shielding material. Outside shell or its surface layer of radiant electrical appliance (such as mobile, microwave oven) as well as cloth and paint with property of radiation protection can be made of this compound material. The material acts to water in air to generate negative ion that neutralizes positive ion generated from radiant object so as to reduce harmful electromagnetic radiation.
Description
The present invention relates to a kind of electromagnetic shielding composite material.
Electromagnetic radiation is the product of modern civilization, high speed development along with wireless communication tool, radio and television services, the all-round popularization of office computer automation, popularizing rapidly of household electrical appliance, though bring great convenience with quick to people's life, also produced a kind of novel environmental pollution---electromagnetic radiation.
In today of information age, electromagnetic radiation is ubiquitous in our life, except TV, broadcasting, radar detection, and fields such as aviation management, astronomical surveing, wireless remotecontrol and communication, and household electrical appliances are until nuclear energy, and none is not radiating the electromagnetic radiation of various energy.Thisly cannot see, can not touch, smell less than, make the imperceptible harm of people, bringing to seriously influence to human health, become the inducement of numerous disease.
The harmful electromagnetic wave that relates to herein mainly is meant the radio frequency electromagnetic that is in the human habitat.Radio frequency electromagnetic comprises medium wave, shortwave, ultrashort wave, and its fundamental frequency is the 10--40 megacycle, and harmonic frequency is tens to the hundreds of megacycle, non-directional, it is nonmetal almost can to penetrate the overwhelming majority, it can't be limited in and touch certain space, also is difficult for shielding isolation with the crowd.
As everyone knows, long term exposure is harmful under electromagnetic radiation, it can make cell membrane and body internal protein change, destroy the biological structure and the nervous system of human body, research report shows, long electromagnetic radiation having the greatest impact to children, fetus, can cause children's cancer morbidity 2--3 times above arm's length standard, fetal abortion and aberration rate heighten: simultaneously, mass data shows, the amount of electromagnetic radiation of commercially available mobile phone is more than 20 times of defined standard, and long-term the use can produce adverse consequencess such as abalienation, amnesia, eyesight attenuating; Because the electromagnetic radiation that computer, TV produce can be brought out cancer, leukaemia etc., causes the people fatal position in unconsciously.High dose and long-time radiation effect are clearly, yet, can cause disease even death than the long-time radiation of low dosage with sample.
At present also there are not a kind of effective methods to avoid the harm of electromagnetic radiation.A kind of simpler method is, sets up a screen that human body and radiation are separated between people and radiation source, stops that as plumbous target X-ray, microwave oven establish the isolated microwave emission of a copper mesh.Another technology be exactly the Applied Physics principles of chemistry absorb, in and electromagnetic radiation.Electromagnetic radiation is undertaken by positive ion beam in human body.If before cation reaches human body, just be neutralized, absorb, just can avoid its negative effect.
The purpose of this invention is to provide a kind of composite material that can electromagnetic radiation shielding.
Tourmaline is because the crystal structure of itself uniqueness---and same direction is all pointed on top, silicon-oxy tetrahedron angle, therefore has electric polarity, is the unique mineral with positive and negative electrode of nature.Its spontaneous electrode voltinism is not influenced by extraneous factor; Different types of tourmaline all has this character.
Superfine tourmaline powder by the electrostatic field that forms between the positive and negative electrode, the airborne hydrone of electrolysis, forms anion, with in and the cation that sends of radiation object, and reduce or weaken harmful electromagnetic radiation.
Tourmaline has pyroelectricity and piezoelectricity, is affected by the external environment, and as variations in temperature, also charge generation can be arranged; When tourmaline places extra electric field, variations in temperature that can generation itself, there is stress to produce.This has greatly strengthened its field effect, more helps the effect of electromagnetic shielding.
Continue to produce anion by tourmaline particles and airborne hydrone effect, in and the cation that sent of radiant body, to avoid hazards of Electromagnetic Radiation.Because it is the electrostatic field at the two poles of the earth that the tourmaline particles surface exists with its C axle axial plane, E
0=6.2*10
6V/m
0(T.Nakamuraand T.Kubo, 1992).Electrostatic field is along with weakening rapidly away from the center, but for the tourmaline particles of several microns of diameters, within the particle diameter several times scope, promptly in tens micrometer ranges, all has 10 around tourmaline particles
7-10
4The high field intensity of V/m.Under the effect of electrostatic field, the hydrone generation electrolysis around the tourmaline particles forms H
+And OH
-Electrostatic field attracts the cation and and the OH of process
-React, neutralized.In addition, heat that household electrical appliances produced when using or the pressure that is subjected to also make the surrounding environment of tourmaline change, and owing to the pyroelectricity and the piezoelectricity of tourmaline produces stronger electric field, send more anion, and electromagnetic shielding action is strengthened.
The invention provides a kind of electromagnetic shielding material, it contains porous material carrier and tourmaline particle, the particle diameter of described tourmaline particle between the 0.3-10 micron, preferred about 3 microns.Thin more in theory good more, little particle diameter has big specific area, and as much as possible evenly distributing and react with airborne water in porous carrier can be the most effective.If particle diameter is excessive, then reaction effect is not obvious.The content of tourmaline in shielding material can be in 5-30% (weight), preferred 10-15% (weight).
Used tourmaline can be any tourmaline well known in the prior art in the electromagnetic shielding material of the present invention.For example can be the Fe-tourmaline, molecular formula NaFe
3Al
6[Si
6O
18] (BO
3)
3(OH F), claims schorl again.In theory, tourmaline natural or that synthesize all can use.From price, the Fe-tourmaline is only, and it is extensive in distributed in nature, except a small amount of industry is used, does not obtain utilizing at all.Other crude tourmaline, elbaite NaLi
3Al
6[Si
6O
18] (BO
3)
3(OH F), also can use, and just price is expensive, and cost is higher.Dravite NaMg
3Al
6[Si
6O
18] (BO
3)
3(OH, F), uvite CaMg
3Al
6[Si
6O
18] (BO
3)
3(OH F) also can use, and effect is poor slightly.
In the electromagnetic shielding material of the present invention, described porous carrier materials can be any material that can the bearing electric stone granulate.This material can be made up of porous resin (as high density polyethylene (HDPE)), wherein contains equally distributed tourmaline superfine powder.This material can be poured into a mould, pressing mold is made multiple profile, as sheet, planar, or the like, as the shell of general household electrical appliances, place between human body and the radiation source, play effectively isolated electromagnetic effect.Planar profile is first-selected, and it has the effect that bigger surface area contacts with air, can strengthen shielding.For example, tourmaline stirs, mixes formation several millimeters particle approximately with polyethylene, using the injection moulding curing molding, wherein can add dyestuff, various filler.Carrier material also can use other porous materials except above-mentioned polyethylene, porous ceramic for example, and textile cloth as long as enough big specific area can be arranged, can hold tourmaline and tourmaline is evenly distributed.
The fundamental reaction that produces anion is because the combining of porous carrier and particulate tourmaline.The carrier of porous makes tourmaline particles that the area that contacts with air as much as possible be arranged, by the electrolysis of the electric field around the tourmaline to hydrone on every side.The electrostatic field that tourmaline produces is equivalent to the weak current of 0.06mA, produces anion (OH
-)..Simultaneously, produce H with the generation coupling reaction of water again
3O
2 -, form the anion stream that continues.
Airborne steam is the key factor that anion produces, and enough water is in use preferably arranged in the air.
Electromagnetic shielding material of the present invention can be applicable to suitable extensive fields, can send the household electrical appliances of electromagnetic radiation as all: mobile phone, microwave oven, computer, broadcast receiver, television set, air-conditioning, electric blanket, refrigerator or the like and Medical Devices and industrial electric facility.Material of the present invention also can absorb harmful long-wave electromagnetic waves (0.15--10m).
Tourmaline not only can play electromagnetic shielding action, and the formed anion of the airborne hydrone of its electrolysis intersperses among in the air, can play calm function, make the people even-tempered and good-humoured.Tourmaline capable sends the electromagenetic wave radiation that wavelength is the far infrared zone of 4-14 micron simultaneously, can be used for influencing the white blood cell activity of human body, the peroxidating of inhibition unrighted acid, improve blood circulation, promote health, can also make card and be placed on anti-odour in the pocket, anti-smoke.
Embodiment:
Electromagnetic wave shield film is a raw material with peach tourmaline (Li tourmaline).The micro mist of making thus (about 5 microns of granularities) forms with the ratio of low density polyethylene (LDPE) in 1: 9, evenly mixing, curing.Tourmaline evenly distributes in polyethylene, naked eyes undistinguishable particle and carrier.Film every between human body and radiation generation source, also can be bonded at any body surface attached on the household electrical appliances that can send electromagnetic radiation, plays the effect of isolated radiation.
Electromagnetic shielding panel, raw material are aphrizite (uvite that contains Fe).By its superfine powder of making, about 0.3 micron of granularity forms in evenly mixing with top identical ratio, solidifying with high density polyethylene (HDPE), about 2 millimeters of plate thickness, sky-blue is transparent, places the preceding 5 millimeters places of television screen, start shooting after 5 minutes, the electromagnetism intensity before the television set is reduced to 15V/m.Before and after using, electromagnetism intensity, power density all reduce 40-50%, reach China's statutory standards.
Electromagnetic shielding phone housing, raw material are the Fe-tourmaline of black non transparent.Add granularity and be about 3 microns Fe-tourmaline micro mist in the ordinary production raw material, the cast pressing mold forms.Compare with the plastic casing of general mobile phone, (Motorola 368 and Nokia 8110) experimentizes to two kinds of brand mobile phones, and its power density is reduced to 0.03mW/cm respectively
2, 0.01mW/cm
2, decreasing by 70-90%, shield effectiveness is remarkable.
List of references:
1.Sidey?B.Lang，The?history?of?pyroelectricity：from?ancient?Greece?tospace?missions，Ferroelectrics，Vol.230，pp.99-108，1999
2.R.V.Dietrich，the?tourmaline?group，Van?Nostrand?ReinholdCompany，New?York，1985.
3.Gabrielle?Donnay，Structure?mechanism?of?pyroelectricity?intourmaline，Acta?Cryst.A33，927-932，1977
4.T.Nakamura?and?T.Kubo，tourmaline?group?crystals?reaction?with?water，Ferroelectrics，Vol.137，pp.13-31，1992
5.U.S.Patent?Documents，5928784?Jul.，1999?Sugihara?et?al.428/372.
6.Kubo，Permanent?electrode?carrier?using?tourmaline，U.S.PatentDocuments?5,601,909，February?11，1997
Claims (6)
1. electromagnetic shielding material, it contains porous material carrier and tourmaline particle, and the particle diameter of described tourmaline particle is the 0.3-10 micron, and the content of tourmaline in shielding material is 5-30% (weight).
2. according to the described electromagnetic shielding material of claim 1, the particle diameter of wherein said tourmaline particle is 3 microns.
3. according to claim 1 or 2 described electromagnetic shielding materials, wherein, the content of tourmaline in shielding material is 10-15% (weight).
4. according to the described electromagnetic shielding material of claim 1, wherein said tourmaline is Fe, Mg, Li, Mn or Al tourmaline.
5. according to the described electromagnetic shielding material of claim 4, wherein said tourmaline is the Fe-tourmaline.
6. according to the described electromagnetic shielding material of claim 1, wherein, described porous carrier materials is high density polyethylene (HDPE), porous ceramic or textile material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01100150XA CN1172567C (en) | 2001-01-09 | 2001-01-09 | Composite material for electromagnetic shielding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01100150XA CN1172567C (en) | 2001-01-09 | 2001-01-09 | Composite material for electromagnetic shielding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1364052A true CN1364052A (en) | 2002-08-14 |
| CN1172567C CN1172567C (en) | 2004-10-20 |
Family
ID=4651332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01100150XA Expired - Fee Related CN1172567C (en) | 2001-01-09 | 2001-01-09 | Composite material for electromagnetic shielding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1172567C (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100335587C (en) * | 2005-12-01 | 2007-09-05 | 上海交通大学 | Dielectric/magnetic composite wave-absorbing powder preparation method |
| CN100387080C (en) * | 2004-09-22 | 2008-05-07 | 乐金电子(中国)研究开发中心有限公司 | Far-infrared ray generating apparatus for portable terminal and method thereof |
| CN101683019B (en) * | 2007-03-22 | 2012-07-18 | 3M创新有限公司 | Electromagnetic wave shielding material and sheet |
| CN102711427A (en) * | 2012-06-20 | 2012-10-03 | 张小亚 | Multifunctional electromagnetic radiation absorber |
| CN103289642A (en) * | 2013-06-14 | 2013-09-11 | 邬汝源 | Negative oxygen ion porous soft material body and production method thereof |
| CN103289643A (en) * | 2013-06-14 | 2013-09-11 | 邬汝源 | Negative oxygen ion hard porous material body and production method thereof |
| CN104017539A (en) * | 2014-01-20 | 2014-09-03 | 黄国强 | Negative oxygen ion porous material |
| CN104608454A (en) * | 2015-01-27 | 2015-05-13 | 深圳金芝麻科技有限公司 | Radiation neutralizing film for electronic product and preparation method for radiation neutralizing film |
| CN109302517A (en) * | 2018-12-06 | 2019-02-01 | 哈尔滨盛世康虹生物技术有限公司 | Mobile phone antiradiation energy material and anti-radiation device of mobile telephone |
| CN117682807A (en) * | 2023-12-13 | 2024-03-12 | 江苏凯尔门业有限公司 | Low-heat-conductivity infrared reflection and radiation integrated material and preparation method and application thereof |
-
2001
- 2001-01-09 CN CNB01100150XA patent/CN1172567C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100387080C (en) * | 2004-09-22 | 2008-05-07 | 乐金电子(中国)研究开发中心有限公司 | Far-infrared ray generating apparatus for portable terminal and method thereof |
| CN100335587C (en) * | 2005-12-01 | 2007-09-05 | 上海交通大学 | Dielectric/magnetic composite wave-absorbing powder preparation method |
| CN101683019B (en) * | 2007-03-22 | 2012-07-18 | 3M创新有限公司 | Electromagnetic wave shielding material and sheet |
| CN102711427A (en) * | 2012-06-20 | 2012-10-03 | 张小亚 | Multifunctional electromagnetic radiation absorber |
| CN103289642A (en) * | 2013-06-14 | 2013-09-11 | 邬汝源 | Negative oxygen ion porous soft material body and production method thereof |
| CN103289643A (en) * | 2013-06-14 | 2013-09-11 | 邬汝源 | Negative oxygen ion hard porous material body and production method thereof |
| CN104017539A (en) * | 2014-01-20 | 2014-09-03 | 黄国强 | Negative oxygen ion porous material |
| CN104608454A (en) * | 2015-01-27 | 2015-05-13 | 深圳金芝麻科技有限公司 | Radiation neutralizing film for electronic product and preparation method for radiation neutralizing film |
| CN109302517A (en) * | 2018-12-06 | 2019-02-01 | 哈尔滨盛世康虹生物技术有限公司 | Mobile phone antiradiation energy material and anti-radiation device of mobile telephone |
| CN117682807A (en) * | 2023-12-13 | 2024-03-12 | 江苏凯尔门业有限公司 | Low-heat-conductivity infrared reflection and radiation integrated material and preparation method and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1172567C (en) | 2004-10-20 |
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Granted publication date: 20041020 Termination date: 20110109 |