CN102300446A - Composite electromagnetic wave absorbing material used for radio frequency identification of internet of things - Google Patents
Composite electromagnetic wave absorbing material used for radio frequency identification of internet of things Download PDFInfo
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- CN102300446A CN102300446A CN201110174363A CN201110174363A CN102300446A CN 102300446 A CN102300446 A CN 102300446A CN 201110174363 A CN201110174363 A CN 201110174363A CN 201110174363 A CN201110174363 A CN 201110174363A CN 102300446 A CN102300446 A CN 102300446A
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Abstract
The invention relates to a composite electromagnetic wave absorbing material used for radio frequency identification (RFID) of internet of things. The absorbing material comprises an absorbent and an adhesive; the absorbent is composed of a mixture including a soft magnetic ferrite powder with a length of 0.5 micros to 10 micros and a micro soft magnetic metal powder; and the adhesive consists of organic resin, chlorinated polyethylene and silicone rubber and the like. According to the invention, an absorbent is utilized to enable realization of a hysteresis loss of a high frequency (13.56 MHz) electromagnetic wave and an ultrahigh frequency (900 MHz) electromagnetic wave; diffusion and attenuation influences on an electromagnetic wave between particles are combined; and an eddy current loss is formed on a surface of a composite shielding absorber, so that an absorbing performance with specific requirements is obtained. Meanwhile, the absorbing material provided in the invention is suitable for being manufactured into composite absorbing shields with different shapes and different thickness in various modes, thereby meeting requirements of packaging of RFID chips and antennas with different standards.
Description
Technical field
The present invention relates to a kind of electromagnetic wave absorbent material, particularly a kind of electromagnetic wave compound absorbing material that is used for the Internet of Things radio-frequency (RF) identification.
Background technology
Radio-frequency (RF) identification (RFID) technology is the important component part in the Internet of Things, and radio-frequency (RF) identification (RFID) technology is from being an automatic identification technology in essence.Usually, rfid system is made up of these three major parts of electronic tag, read write line and data management system.Electronic tag is made up of antenna and RFID chip, and each chip all contains unique identification code, is used for representing the object that electronic tag is accompanying.Read write line is used for reading and writing the information in the electronic tag, and read write line is by network and other computers or system communication, finish to the information of electronic tag obtain, explanation and data management.Can be widely used in communications and transportation (as ticketing system, logistic management system etc.), enterprise production process control (as safety of coal mines control system for identifying, enterprise product anti-counterfeit recognition system etc.) and other need carry out industry (as library management system, sub-district access control system) of dynamic management or the like to article.
The main performance index of rfid system is a reading distance, is also referred to as operating distance, and it is illustrated in farthest to distance how far last, and reader can be reliably and the electronic tag exchange message, i.e. the information of reader in can reading tag.This system carries out transfer of data by radio wave, and when radio wave ran into metal or liquid or electromagnetic interference, the signal conduction will produce interference attenuation, and then influences the reliability and the accuracy of data read.Must in electronic tag, encapsulate the anti-electromagnetic shielding absorbing material of one deck in order just to address this problem.The RFID label operates mainly in 512KHz, 13.56MHz, four frequency ranges of 900MHz, 2.4GHz according to the IEC standard.Wherein 512KHz and 2.4GHz are mainly active label, and because of adding power supply in its label, operating power is bigger, and all kinds of electromagnetism noise jamming are less relatively to the signal attenuation that the communications of this frequency range causes.And be used for the electronic tag of 13.56MHz, 900MHz frequency range, be generally passive electronic label, operating power is less, all kinds of electromagnetism clutter frequencies are mainly in 0.1MHz to 1GHz scope simultaneously, therefore the signal attenuation that the communications of these two frequency ranges is caused is bigger, so unaffected in order to guarantee 13.56MHz, 900MHz frequency range electronic tag effective communication distance, it is unaffected to ensure communication distance to be necessary to adopt anti-electromagnetic shielding absorbing material and RFID electronic tag to be packaged together.The kind of anti-electromagnetic shielding absorbing material is a lot, as the ferrite sintered body sheet, the wedge shape absorber, sponge formula absorber etc., they generally are mainly used in 1GHz-18 GHz, are not having effect for the electronic tag of 13.56MHz and 900MHz frequency RFID substantially aspect anti-electromagnetic interference, the reliability that improves data read, the reading distance (operating distance).
Summary of the invention
The objective of the invention is: provide a kind of electromagnetic wave compound absorbing material that is used for the Internet of Things radio-frequency (RF) identification, to remedy the deficiencies in the prior art.
The object of the present invention is achieved like this:
A kind of electromagnetic wave compound absorbing material that is used for the Internet of Things radio-frequency (RF) identification, by weight percentage, form by following component:
Electromagnetic interference absorbent: 60%-95%,
Adhesive: 5%-40%,
Surfactant: electromagnetic interference absorbent weight
0.5%-1.5%.
Described electromagnetic interference absorbent, be by 0.5 micron～10 microns soft magnetic ferrite powder and magnetic permeability greater than 2000 micron order soft magnetic metal powder, both mix the mixture that become by the weight ratio of 2:1～1:4.
Described soft magnetic ferrite powder can be any soft magnetic ferrite powder in Ni-Zn based ferrite, Mn-Zn based ferrite, Mg-Zn based ferrite, Cu-Zn based ferrite, Ni-Cu-Zn based ferrite, Fe-Ni-Zn-Cu based ferrite, the Fe-Mg-Zn-Cu based ferrite; Described micron order soft magnetic metal powder can be one or more soft magnetic metal mixed powders in Fe, Fe-Ni alloy, Fe-Ni-Mo alloy, Fe-Ni-Si-B alloy, Fe-Si alloy, the Fe-Si-Al alloy.
Described adhesive comprises organic resin, haloflex, silicon rubber;
Described surfactant comprises silane coupler, titanate coupling agent.
Making is used for the method for the electromagnetic wave compound absorbing material of Internet of Things radio-frequency (RF) identification, and step is as follows:
One step of the mat woven of fine bamboo strips, soft magnetic ferrite is made 0.5 micron～10 microns powder, magnetic permeability is made micron-sized powder greater than 2000 soft magnetic metal, again two kinds of powder are evenly mixed by the weight ratio of 2:1～1:4, its mixture promptly is the electromagnetic interference absorbent;
Two steps of the mat woven of fine bamboo strips, in the electromagnetic interference absorbent that makes, dose surfactant,
WithAmount is the 0.5%-1.5% of electromagnetic interference absorbent weight, and the even oleophylic that carries out of Jiao Ban Zhuo is handled;
The 3rd step, dose adhesive in the electromagnetic interference absorbent after handle and mix through oleophylic, amount of filling is: electromagnetic interference absorbent: adhesive=60%-95%: 5%-40% obtains being used for the electromagnetic wave composite absorption raw material of Internet of Things radio-frequency (RF) identification;
In the 4th step,,, make the laminar composite shielding absorber of 0.1mm-0.5mm thickness as required by thick film silk screen printing or rolling mill practice with the electromagnetic wave composite absorption raw material of described radio-frequency (RF) identification; Or make strip or tubulose composite shielding absorber by expressing technique; Or make the composite shielding absorber of annular, round or other shape by compressing and forming process.
The composite shielding absorber is placed the bottom and the periphery of RFID chip, can effectively absorb the electromagnetic wave that passes behind the RFID chip, avoid reflection of electromagnetic wave to disturb.Inverse signal during the work of the electronic tag of front is not because of being subjected to the interference of reflected wave, thereby makes greatly raising of read write tag sensitivity (distance of swiping the card).
By implementing the present invention, can make full use of absorbent to high frequency (13.56MHz) and the electromagnetic magnetic hysteresis loss of hyperfrequency (900MHz), in conjunction with between particle to electromagnetic diffusion attenuation, and in shielding absorber surface formation eddy current loss, thereby obtain the absorbing property of particular requirement, simultaneously, the present invention is fit to make in many ways the composite absorption shield of difformity, different-thickness, to satisfy the encapsulation of different size RFID chip and antenna.
Embodiment
Below in conjunction with example, the present invention is described further:
Embodiment one:
Select the Fe powder and the Ni-Cu-Zn based ferrite of purity 98.5% for use, as the electromagnetic interference absorbent, wherein diameter of particle is 0.5 micron～4 microns scope with the 1:1 mixed, with mixed electromagnetic interference absorbent through silane coupler (
WithAmount is 0.5% of electromagnetic interference absorbent weight) after the surface treatment, select for use haloflex as adhesive, the weight ratio of absorbent and adhesive is about 80:20.Absorbent is mixed with haloflex, be rolled into thickness and be: the thin slice of 0.1mm～0.15mm.Adopt the network analysis instrument measurement method, this thin slice in the attenuation by absorption of 0.1MHz～1GHz is :-5dB～-10dB, magnetic permeability υ
1(when 1MHz) is: 45, and this thin slice is pasted on the RFID label with two-sided tape, has at label under the condition of interference (there is metal object at the label back, than the forceful electric power magnetoreflection), and effective communication distance is glitch-free 70%.
Embodiment two:
Select Ni-Zn ferrite and Fe-Si-Al alloy for use, with the 2:1 mixed as the electromagnetic interference absorbent, wherein diameter of particle is 0.5 micron～4 microns scope, with mixed electromagnetic interference absorbent after titanate coupling agent (consumption be electromagnetic interference absorbent weight 1.0%) surface treatment, select polyurethane resin for use, its weight is 10% of absorbent, behind ketone or benzene class organic solvent dissolution, stir into pasty state with absorbent, adopt silk screen printing to be coated with into the thick shielding absorbing membranous layer of 0.5mm, the network analysis instrument measurement method is adopted in dry back, and this rete in the attenuation by absorption of 0.1MHz～1GHz frequency range is :-8dB～-12dB, magnetic permeability υ
1(when 1MHz) is: 30.This thin slice is pasted on the RFID label with two-sided tape, has at label under the condition of interference (there is metal object at the label back, than the forceful electric power magnetoreflection), and effective communication distance is glitch-free 90%.
Embodiment three:
Select Fe-Mg-Zn-Cu soft magnetic ferrite and Fe-Si alloy for use, as the electromagnetic interference absorbent, wherein diameter of particle is 0.9 micron～10 microns scope with the 1:4 mixed, with mixed electromagnetic interference absorbent through silane coupler
(useAmount is 1.2% of electromagnetic interference absorbent weight) surface treatment, select for use epoxy resin as adhesive, the weight ratio of absorbent and epoxy resin is about 95:5, in the sheet of 40MPa pressure compacting 200mm * 200mm * 2mm.After solidifying, adopt the network analysis instrument measurement method, the suction wave plate that 2mm is thick in the attenuation by absorption of 0.1MHz～1GHz is :-10dB～-15dB; Magnetic permeability υ
1(when 1MHz) is: 80.This composite shielding is inhaled the wave plate sheet and is pasted on the RFID label with two-sided tape, has at label under the condition of interference (there is metal object at the label back, than the forceful electric power magnetoreflection), and effective communication distance is glitch-free 90%.
Embodiment four:
Select Mn-Zn based ferrite and Mg-Zn based ferrite for use, ratio preparation with 3:1 mixes soft magnet powder, select for use again the Fe-Ni-Mo alloy with aforementioned mix soft magnet powder with the mixed of 3:2 as the electromagnetic interference absorbent, wherein diameter of particle is 3 microns～8 microns scope, with mixed electromagnetic interference absorbent through silane coupler (consumption be electromagnetic interference absorbent weight 0.8%) surface treatment, select for use NBR rubber (the fine content 40 of fourth) as adhesive, the weight ratio of absorbent and NBR rubber is about 85:15, after two roller mills are plasticated evenly, in 100 tons of vulcanizers, at pressure 10MPa, about 130 ℃ of temperature, under 20 minutes conditions of cure time, moulding obtains the elastic composite shielding absorbing sheet of 200mm * 200mm * 1mm.Adopt the network analysis instrument measurement method, the elasticity that 1.5mm is thick is inhaled wave plate and in the attenuation by absorption of 0.1MHz～1GHz is :-8dB～-12dB; Magnetic permeability υ
1(when 1MHz) is: 50.This elasticity shielding is inhaled the wave plate sheet and is pasted on the RFID label with two-sided tape, has at label under the condition of interference (there is metal object at the label back, than the forceful electric power magnetoreflection), and effective communication distance is glitch-free 85%.
Embodiment five
Select for use Fe-Ni alloy and Fe-Ni-Si-B alloy to prepare the hybrid alloys powder with the mixed of 3:2, select for use Cu-Zn ferrite and aforementioned hybrid alloys powder to prepare the electromagnetic interference absorbent again with the ratio of 1:3, wherein Cu-Zn ferrite powder particle diameter is 0.8～2 micron, and the alloyed powder particle diameter is 6～10 microns.With mixed electromagnetic interference absorbent through titanate coupling agent (consumption be electromagnetic interference absorbent weight 1.5%) surface treatment, selecting haloflex for use is adhesive, the weight ratio of electromagnetic interference absorbent and haloflex is about 89:11, the preparation size is the particle about 2mm*2mm*3mm after adding pressure type banbury banburying evenly, obtain flexible compound shielding wave-absorber in the extrusion molding of Φ 65B plastics screw extruding machine, its shape can be stripe shape, cast, watt type and other different in nature shape.With the bar of its 40mm length * 1mm that extrudes, shear the length of 200mm, as test sample, adopt the network analysis instrument measurement method, the elasticity that 1.0mm is thick is inhaled wave plate and in the attenuation by absorption of 0.1MHz～1GHz is :-10dB～-12dB; Magnetic permeability υ
1(when 1MHz) is: 60.This elasticity shielding is inhaled the wave plate sheet and is pasted on the RFID label with two-sided tape, has at label under the condition of interference (there is metal object at the label back, than the forceful electric power magnetoreflection), and effective communication distance is glitch-free 90%.
Claims (5)
1. electromagnetic wave compound absorbing material that is used for the Internet of Things radio-frequency (RF) identification, by weight percentage, form by following component:
Electromagnetic interference absorbent: 60%-95%,
Adhesive: 5%-40%,
Surfactant: the 0.5%-1.5% of electromagnetic interference absorbent weight.
2. according to the electromagnetic wave compound absorbing material of the described radio-frequency (RF) identification of claim 1, it is characterized in that: described electromagnetic interference absorbent, be by 0.5 micron～10 microns soft magnetic ferrite powder and magnetic permeability greater than 2000 micron order soft magnetic metal powder, both mix the mixture that become by the weight ratio of 2:1～1:4.
3. according to the electromagnetic wave compound absorbing material of the described radio-frequency (RF) identification of claim 2, it is characterized in that: described soft magnetic ferrite powder can be any soft magnetic ferrite powder in Ni-Zn based ferrite, Mn-Zn based ferrite, Mg-Zn based ferrite, Cu-Zn based ferrite, Ni-Cu-Zn based ferrite, Fe-Ni-Zn-Cu based ferrite, the Fe-Mg-Zn-Cu based ferrite; Described micron order soft magnetic metal powder can be one or more soft magnetic metal mixed powders in Fe, Fe-Ni alloy, Fe-Ni-Mo alloy, Fe-Ni-Si-B alloy, Fe-Si alloy, the Fe-Si-Al alloy.
4. according to the electromagnetic wave compound absorbing material of the described radio-frequency (RF) identification of claim 1, it is characterized in that: described adhesive comprises organic resin, haloflex, silicon rubber; Described surfactant comprises silane coupler, titanate coupling agent.
5. a making is used for the method for the electromagnetic wave compound absorbing material of Internet of Things radio-frequency (RF) identification, and step is as follows:
One step of the mat woven of fine bamboo strips, soft magnetic ferrite is made 0.5 micron～10 microns powder, magnetic permeability is made micron-sized powder greater than 2000 soft magnetic metal, again two kinds of powder are evenly mixed by the weight ratio of 2:1～1:4, its mixture promptly is the electromagnetic interference absorbent;
The mat woven of fine bamboo strips two goes on foot, and doses the surfactant of described consumption in the electromagnetic interference absorbent that makes, and stirs to carry out the oleophylic processing;
The 3rd step, dose adhesive in the electromagnetic interference absorbent after handle and mix through oleophylic, amount of filling is electromagnetic interference absorbent: adhesive=60%-95%: 5%-40%, obtains being used for the electromagnetic wave composite absorption raw material of Internet of Things radio-frequency (RF) identification;
In the 4th step,,, make the laminar composite shielding absorber of 0.1mm-0.5mm thickness as required by thick film silk screen printing or rolling mill practice with the electromagnetic wave composite absorption raw material of described radio-frequency (RF) identification; Or make strip or tubulose composite shielding absorber by expressing technique; Or make the composite shielding absorber of annular, round or other shape by compressing and forming process.
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Cited By (9)
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| CN103074031A (en) * | 2013-02-07 | 2013-05-01 | 宜宾金川电子有限责任公司 | Manufacture process for optimizing electromagnetic composite absorption materials |
| CN103295049A (en) * | 2013-06-27 | 2013-09-11 | 中国兵器工业集团第五三研究所 | Flexible ultrahigh-frequency anti-metal electronic tag |
| CN104342084A (en) * | 2014-10-20 | 2015-02-11 | 宜宾金原复合材料有限公司 | Flexible composite electromagnetic wave absorbing material applied to sensing radio frequency identification for internet of things |
| CN105992508A (en) * | 2015-01-30 | 2016-10-05 | 苏州驭奇材料科技有限公司 | Novel nanostructure electromagnetic wave absorption complex and manufacturing method thereof |
| CN106803451A (en) * | 2015-11-26 | 2017-06-06 | 比亚迪股份有限公司 | Absorbing material and suction ripple substrate and suction wave plate and their preparation method and electronic equipment |
| CN107523939A (en) * | 2016-06-21 | 2017-12-29 | 刘向文 | A kind of ultrathin flexible electromagnetic shielding film and preparation method thereof |
| CN108091465A (en) * | 2017-12-08 | 2018-05-29 | 北京弗圣威尔科技有限公司 | It is easy to material of detection identification and preparation method thereof and is easy to the container of detection identification |
| CN108260337A (en) * | 2018-01-11 | 2018-07-06 | 深圳市佰瑞兴实业有限公司 | A kind of wave absorbing patch and preparation method |
| CN115820139A (en) * | 2022-12-14 | 2023-03-21 | 江苏伊诺尔新材料科技有限公司 | Magnetic conduction double sticky tape suitable for wireless field of charging |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103074031A (en) * | 2013-02-07 | 2013-05-01 | 宜宾金川电子有限责任公司 | Manufacture process for optimizing electromagnetic composite absorption materials |
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| CN115820139A (en) * | 2022-12-14 | 2023-03-21 | 江苏伊诺尔新材料科技有限公司 | Magnetic conduction double sticky tape suitable for wireless field of charging |
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