CN101166413A - Electromagnetic wave absorption materials - Google Patents
Electromagnetic wave absorption materials Download PDFInfo
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- CN101166413A CN101166413A CNA2006101360620A CN200610136062A CN101166413A CN 101166413 A CN101166413 A CN 101166413A CN A2006101360620 A CNA2006101360620 A CN A2006101360620A CN 200610136062 A CN200610136062 A CN 200610136062A CN 101166413 A CN101166413 A CN 101166413A
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- electromagnetic wave
- absorbent material
- wave absorbent
- barium titanate
- titanate powder
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Abstract
The electromagnetic-wave absorbing material is suitable to frequency between 30MHz to 1GHz. The invention adds carbon and barium titanate into insulated macromolecules. After mixing or pugging operations, the invention adds coupling agent, dispersing agent, or flow promotor into the admixture. Passing through jet molding procedure, the admixture can be matched to any complex exterior. Absorptivity of the admixture is 99.7% for 30MHz electromagnetic wave, and absorptivity is larger than 95% for 1GHz electromagnetic wave.
Description
Technical field
The present invention relates to a kind of composite material, more specifically, relate to the application of this material in electro-magnetic wave absorption.
Background technology
For the unlikely human body that influences of electromagnetic wave that general electrical appliance is produced, industry has been developed multiple electromagnetic shielding material in recent years.United States Patent (USP) No. 5571991, No. 5714102, No. 5595689; No. the 3248658th, Deutsche Bundespatent; WO patent publication No. No. 98/05043, No. 96/28007; The flat 05-306602 of Japanese patent application number, clear 58-236080 number; Or patent such as European patent No. 0218183, No. 0454311, No. 0401141, lie in and add electric conducting material such as stainless steel, copper, aluminium, nickel plated carbon fiber etc. in the plastic material, not only costliness but also ejection formation easily have problems such as floating fibre or poly-fibre.
No. the 5696169th, United States Patent (USP) vacuum evaporation thickness on plastic casing easily has problems such as adhesive force is not good, not scratch resistance, processing procedure discharge of wastewater greater than one micron metal, and partly conductive paint comes off and then can cause screening effect bad.
In addition, prior art also has magnetic material such as iron oxide, zinc oxide, the moulding of manganese oxide equimagnetic powder sintering.Or after in elastomer (as iso-amylene rubber, itrile group rubber or silicone rubber etc.), adding magnetic such as iron oxygen magnetic or metal powder, mixing flakiness.This thin slice covers efficient less than 10db (decibel), effectively electromagnetic wave shielding in the electromagnetic wave scope (between the 30MHz to 1GHz) of general household electrical appliance.This mandatory declaration be, 10db refers to 90% electromagnetic wave crested, 20db refers to 99.9% electromagnetic wave crested, by that analogy.
United States Patent (USP) No. 5201039, No. 3213605, No. 3139096; The WO patent discloses No. 05/084097 in early days; Japan Patent No. 0232786, No. 4129312, No. 7326543, No. 2075785; No. the 2124788th, Romania's patent; No. the 2277217th, British patent; And patent such as No. the 1308971st, European patent then is to adopt composite component, and it has ceramic condenser, battery lead plate, sheet metal, and magnetic, is combined into penetrating type structure (L-C type) with electromagnetic wave shielding.
United States Patent (USP) then is for No. 5512196, No. 5407129, No. 5856700 and European patent the 0583809th B1 number to mix behind ferroelectric material and the magnetic material with the high pressure pressing again through the high temperature sintering moulding.The composite material that this kind practice forms almost can't cover the following electromagnetic wave of 100MHz, and the molding mode costliness is time-consuming.
Summary of the invention
Be the molding mode consumption consuming time worker of electromagnetic wave absorbent material in the solution prior art, and can't be applicable to the electromagnetic wave scope shortcomings such as (between the 30MHz to 1GHz) of general household electrical appliances, the invention provides a kind of electromagnetic wave absorbent material, comprise barium titanate powder; Carbon; And insulation macromolecule; Wherein said carbon and described barium titanate powder are dispersed in the described insulation macromolecule.
Description of drawings
Fig. 1 is the comparative graph of the preferred embodiment of the present invention and Comparative Examples.
Embodiment
The invention provides electromagnetic wave absorbent material applicable to various complicated appearances and forming method thereof.At first, the insulation macromolecule is added carbon and barium titanate powder, after mixing between in 200 to 250 ℃ of twin-screw mixer machine or other suitable machine, can add coupling agent, dispersant or flow promortor according to circumstances.Said mixture can mate all complicated appearances behind ejection formation, can be to 30MHz absorption of electromagnetic wave rate greater than 99.7%, and can be to 1GHz absorption of electromagnetic wave rate greater than 95%.With 100 weight portions insulation macromolecule is that benchmark calculates, and barium titanate powder accounts for about 5 to 30 weight portions, and carbon accounts for about 2 to 10 weight portions.
The suitable insulation macromolecule can be Merlon (PC), phenylethylene/butadiene/acrylonitrile copolymer (ABS), polypropylene (PP), polyethylene (PE) or above-mentioned combination.In a preferred embodiment of the invention, the insulation macromolecule can be PC/ABS, as PC-540 or PC-510 and the unusual GE C2800 that sells, GE C6600 or the GE C2950 that strange U.S. sold.
The shape of barium titanate powder is preferably particle diameter spherical or oval between about 100nm to 6 μ m, or strip or the sheet of particle diameter between about 0.5 μ m to 10 μ m.Barium titanate powder is preferably perovskite structure (perovskite), and preferred crystal habit is a tetragonal crystal system, and preferred dielectric constant is between about 20 to 2000.General barium titanate structural formula is Ba
xTi
yO
3, x/y of the present invention serves as preferred with 4/1 to 1/5.
The used carbon of the present invention can be powdered graphite, carbon fiber, carbon black powders or above-mentioned combination.If adopt graphite, then its shape can be sphere, ellipse, strip or sheet.If adopt carbon fiber, its diameter/length ratio can be between about 1/10 to 1/100.
In the preferred embodiment of the present invention, make benchmark (100 weight portion) with the insulation macromolecule, can add the coupling agent of 0.5 to 4 weight portion, the dispersant of 0.5 to 6 weight portion according to circumstances, the antioxidant of the flow promortor of 1.0 to 7 weight portions or 0.1 to 1 weight portion.In the preferred embodiment of the present invention, coupling agent can be ken-React, Lica38 or the Lica44 that Changxing chemical industry is sold that Taiwan plastic company is sold.Preferred dispersing agent can be KD10 or the KD01 that the tall chemical industry of Krator Fg1901 or state that Taiwan plastic company sold is sold.Flow promortor can be known magnesium stearate of general industry or calcium stearate.Suitable antioxidant can be Irganox1076 (Ao-3) or the P-3 that the tall chemical industry of state is sold.For making the clearer feature of the present invention of those skilled in the art, especially exemplified by following preferred embodiment and Comparative Examples.
[embodiment 1]
After the PC/ABS that the graphite powder of the barium titanate powder of 10 weight portions and 3 weight portions is added 100 weight portions mixes, pour this mixture the feed well of double helix bar mixing roll into, its temperature is 200 ℃.The dispersant (KD10), and the flow promortor (magnesium stearate) of 2.5 weight portions that then add coupling agent (Lica38), 2 weight portions of 1.5 weight portions in the compression section of 220 ℃ mixing roll.The antioxidant (Irganox1076 (Ao-3)) that adds at last 0.2 weight portion at the melt zone of 250 ℃ mixing roll.Above-mentioned composite material is after the water-bath cooling and dicing, ejection formation is the thin slice (numbering 1) of 3 millimeters of thickness, its electro-magnetic wave absorption parameter such as table one can find clearly that absorption efficiency between 30MHz to 1GHz all greater than 10db, promptly absorbs the electromagnetic wave more than 90%.
Table one
[embodiment 2]
After the PC/ABS that the graphite powder of the barium titanate powder of 20 weight portions and 7 weight portions is added 100 weight portions mixes, pour this mixture the feed well of double helix bar mixing roll into, its temperature is 200 ℃.The dispersant (KD10), and the flow promortor (magnesium stearate) of 2.5 weight portions that then add coupling agent (Lica38), 2 weight portions of 1.5 weight portions in the compression section of 220 ℃ mixing roll.The antioxidant Irganox1076 (Ao-3) that adds at last 0.2 weight portion at the melt zone of 250 ℃ mixing roll.Above-mentioned composite material is after the water-bath cooling and dicing, ejection formation is the thin slice (numbering 2) of 3 millimeters of thickness, its electro-magnetic wave absorption parameter such as table two can find clearly that absorption efficiency between 30MHz to 1GHz all greater than 10db, promptly absorbs the electromagnetic wave more than 90%.
Table two
[embodiment 3]
After the PC/ABS that the graphite fibre of the barium titanate powder of 10 weight portions and 3 weight portions is added 100 weight portions mixes, pour this mixture the feed well of double helix bar mixing roll into, its temperature is 200 ℃.The dispersant (KD10), and the flow promortor (magnesium stearate) of 2.5 weight portions that then add coupling agent (Lica38), 2 weight portions of 1.5 weight portions in the compression section of 220 ℃ mixing roll.The antioxidant Irganox1076 (Ao-3) that adds at last 0.2 weight portion at the melt zone of 250 ℃ mixing roll.Above-mentioned composite material is after the water-bath cooling and dicing, ejection formation is the thin slice (numbering 3) of 3 millimeters of thickness, its electro-magnetic wave absorption parameter such as table three can know that the absorption efficiency of discovery between 30MHz to 1GHz all greater than 10db, promptly absorbs the electromagnetic wave more than 90%.
Table three
[embodiment 4]
After the PC/ABS that the barium titanate powder and the 3 parts by weight of carbon black powder of 10 weight portions are added 100 weight portions mixes, pour this mixture the feed well of double helix bar mixing roll into, its temperature is 200 ℃.The dispersant (KD10), and the flow promortor (magnesium stearate) of 2.5 weight portions that then add coupling agent (Lica38), 2 weight portions of 1.5 weight portions in the compression section of 220 ℃ mixing roll.The antioxidant Irganox1076 (Ao-3) that adds at last 0.2 weight portion at the melt zone of 250 ℃ mixing roll.Above-mentioned composite material is after the water-bath cooling and dicing, ejection formation is the thin slice (numbering 4) of 3 millimeters of thickness, its electro-magnetic wave absorption parameter such as table four can know that the absorption efficiency of discovery between 30MHz to 1GHz all greater than 10db, promptly absorbs the electromagnetic wave more than 90%.
Table four
[Comparative Examples 1]
After the PC/ABS that 3 parts by weight of carbon black powder are added 100 weight portions mixes, pour this mixture the feed well of double helix bar mixing roll into, its temperature is 200 ℃.The dispersant (KD10), and the flow promortor (magnesium stearate) of 2.5 weight portions that then add coupling agent (Lica38), 2 weight portions of 1.5 weight portions in the compression section of 220 ℃ mixing roll.The antioxidant Irganox1076 (Ao-3) that adds at last 0.2 weight portion at the melt zone of 250 ℃ mixing roll.Above-mentioned composite material is after the water-bath cooling and dicing, and ejection formation is the thin slice of 3 millimeters of thickness.
[Comparative Examples 2]
After getting pure barium titanate powder sinter molding, be sliced into the thin slice of 3 millimeters of thickness in the mode of machining.
[Comparative Examples 3]
After the PC/ABS that the barium titanate powder of 10 weight portions is added 100 weight portions mixes, pour this mixture the feed well of double helix bar mixing roll into, its temperature is 200 ℃.The dispersant (KD10), and the flow promortor (magnesium stearate) of 2.5 weight portions that then add coupling agent (Lica38), 2 weight portions of 1.5 weight portions in the compression section of 220 ℃ mixing roll.The antioxidant Irganox1076 (Ao-3) that adds at last 0.2 weight portion at the melt zone of 250 ℃ mixing roll.Above-mentioned composite material is after the water-bath cooling and dicing, and ejection formation is the thin slice of 3 millimeters of thickness.
As shown in Figure 1, be the comparative graph of the embodiment of the invention 4 with Comparative Examples 1-3.Can clearly find pure barium titanate in the following nearly unavailable of 100MHz by Fig. 1, and only the insulation macromolecule of the insulation macromolecule of blending carbon black and a blending barium titanate to the absorption of electromagnetic wave rate of 30MHz to 1GHz all less than 10db (less than 90%).The embodiment that has only simultaneously blending barium titanate powder and carbon all has absorptivity greater than 10db to the electromagnetic wave of 30MHz to 1GHz.Particularly in the electromagnetic wave bands (30 to 100MHz) of 3C Product, the present invention has outstanding especially effect (being similar to 40db).
Though the present invention discloses as above with a plurality of preferred embodiments; right its is not in order to limit the present invention; those of ordinary skill under any in the technical field; do not breaking away under the spirit and scope of the present invention; should do to change arbitrarily and retouching, so protection scope of the present invention should be as the criterion with appending claims institute restricted portion.
Claims (19)
1. electromagnetic wave absorbent material comprises:
Barium titanate powder;
Carbon; And
The insulation macromolecule;
Wherein said carbon and described barium titanate powder are dispersed in the described insulation macromolecule.
2. electromagnetic wave absorbent material as claimed in claim 1, the 30MHz electromagnetic wave absorptivity of wherein said electromagnetic wave absorbent material is greater than 99.97%.
3. electromagnetic wave absorbent material as claimed in claim 1, the 1GHz electromagnetic wave absorptivity of wherein said electromagnetic wave absorbent material is greater than 95%.
4. electromagnetic wave absorbent material as claimed in claim 1, wherein said barium titanate powder be shaped as particle diameter spherical or oval between about 100mm to 6 μ m.
5. electromagnetic wave absorbent material as claimed in claim 1, wherein said barium titanate powder be shaped as strip or the sheet of particle diameter between about 0.5 μ m to 10 μ m.
6. electromagnetic wave absorbent material as claimed in claim 1, wherein said barium titanate powder are perovskite structure.
7. electromagnetic wave absorbent material as claimed in claim 1, the crystallization of wherein said barium titanate powder are tetragonal crystal system.
8. electromagnetic wave absorbent material as claimed in claim 1, the structural formula of wherein said barium titanate powder are Ba
xTi
yO
3, x/y is between 4/1 to 1/5.
9. electromagnetic wave absorbent material as claimed in claim 1, the dielectric constant of wherein said barium titanate powder is between about 20 to 2000.
10. electromagnetic wave absorbent material as claimed in claim 1, wherein said carbon comprise powdered graphite, carbon fiber, carbon black powders or above-mentioned combination.
11. electromagnetic wave absorbent material as claimed in claim 10, the shape of wherein said powdered graphite comprises sphere, ellipse, strip or sheet.
12. electromagnetic wave absorbent material as claimed in claim 10, the diameter/length of wherein said carbon fiber is than between about 1/10 to 1/100.
13. electromagnetic wave absorbent material as claimed in claim 1, wherein said insulation macromolecule comprises Merlon, phenylethylene/butadiene/acrylonitrile copolymer, polypropylene, polyethylene or above-mentioned combination.
14. electromagnetic wave absorbent material as claimed in claim 1, wherein said insulation macromolecule accounts for 100 weight portions; Described barium titanate powder accounts for about 5 to 30 weight portions; Described carbon accounts for about 2 to 10 weight portions.
15. electromagnetic wave absorbent material as claimed in claim 1 also comprises coupling agent, dispersant, flow promortor, antioxidant, or above-mentioned combination.
16. electromagnetic wave absorbent material as claimed in claim 15, wherein said coupling agent account for about 0.5 to 4 weight portion.
17. electromagnetic wave absorbent material as claimed in claim 15, wherein said dispersant account for about 0.5 to 6 weight portion.
18. electromagnetic wave absorbent material as claimed in claim 15, wherein said flow promortor account for about 1.0 to 7 weight portions.
19. electromagnetic wave absorbent material as claimed in claim 15, wherein said antioxidant account for about 0.1 to 1 weight portion.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101360620A CN100508716C (en) | 2006-10-20 | 2006-10-20 | Electromagnetic wave absorption materials |
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|---|---|---|---|
| CNB2006101360620A CN100508716C (en) | 2006-10-20 | 2006-10-20 | Electromagnetic wave absorption materials |
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| CN101166413A true CN101166413A (en) | 2008-04-23 |
| CN100508716C CN100508716C (en) | 2009-07-01 |
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|---|---|---|---|
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102907193A (en) * | 2010-05-27 | 2013-01-30 | 日东电工株式会社 | Dielectric material sheet and process for production thereof, and electromagnetic wave absorber |
| CN106554753A (en) * | 2016-10-20 | 2017-04-05 | 天津大学 | Mix potassium lanthanum manganate/Graphene composite wave-suction material and preparation method thereof |
| CN107502286A (en) * | 2017-08-15 | 2017-12-22 | 中国人民解放军火箭军疾病预防控制中心 | A kind of preparation method of nano-fiber composite material for anti-electromagnetic-radiation |
| CN107602156A (en) * | 2017-10-13 | 2018-01-19 | 四川航天机电工程研究所 | A kind of microwave-absorbing ceramic and preparation method thereof |
| CN107760954A (en) * | 2016-08-18 | 2018-03-06 | 北京大学 | A kind of new electromagnetic wave absorbing material and preparation method thereof |
-
2006
- 2006-10-20 CN CNB2006101360620A patent/CN100508716C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102907193A (en) * | 2010-05-27 | 2013-01-30 | 日东电工株式会社 | Dielectric material sheet and process for production thereof, and electromagnetic wave absorber |
| CN107760954A (en) * | 2016-08-18 | 2018-03-06 | 北京大学 | A kind of new electromagnetic wave absorbing material and preparation method thereof |
| CN107760954B (en) * | 2016-08-18 | 2019-12-03 | 北京大学 | A kind of new electromagnetic wave absorbing material and preparation method thereof |
| CN106554753A (en) * | 2016-10-20 | 2017-04-05 | 天津大学 | Mix potassium lanthanum manganate/Graphene composite wave-suction material and preparation method thereof |
| CN106554753B (en) * | 2016-10-20 | 2019-04-09 | 天津大学 | Mix potassium lanthanum manganate/graphene composite wave-suction material and preparation method thereof |
| CN107502286A (en) * | 2017-08-15 | 2017-12-22 | 中国人民解放军火箭军疾病预防控制中心 | A kind of preparation method of nano-fiber composite material for anti-electromagnetic-radiation |
| CN107502286B (en) * | 2017-08-15 | 2020-05-15 | 中国人民解放军火箭军特色医学中心 | Preparation method of nanofiber composite material for resisting electromagnetic radiation |
| CN107602156A (en) * | 2017-10-13 | 2018-01-19 | 四川航天机电工程研究所 | A kind of microwave-absorbing ceramic and preparation method thereof |
| CN107602156B (en) * | 2017-10-13 | 2020-10-16 | 四川航天机电工程研究所 | Wave-absorbing ceramic and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN100508716C (en) | 2009-07-01 |
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Granted publication date: 20090701 Termination date: 20201020 |