CN109511255A - High-performance compound slab absorbing material and preparation method thereof - Google Patents
High-performance compound slab absorbing material and preparation method thereof Download PDFInfo
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- CN109511255A CN109511255A CN201811569889.XA CN201811569889A CN109511255A CN 109511255 A CN109511255 A CN 109511255A CN 201811569889 A CN201811569889 A CN 201811569889A CN 109511255 A CN109511255 A CN 109511255A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0088—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a plurality of shielding layers; combining different shielding material structure
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Abstract
The present invention relates to a kind of high-performance compound slab absorbing materials and preparation method thereof.The high-performance compound slab absorbing material is made of two layers of different plate absorber of carburizing ladder spreading depth, and the plate absorber is made absorbent uniform adsorption into every strata urethane foam substrate using impregnation method.High-performance compound slab absorbing material frequency of use of the invention: 700MHz~40GHz, Normal incidence reflectance rate are less than -15dB.Excision forming is easy with material.It can be used for reducing the cross jamming between adjacent antenna, prevent personal injury, reduce metal body surface electric current, selectively cover the domestic required part blocked of test wrapper；The advantages that material fire protecting performance is up to state standards B2 grades of GB8624, is used for a long time without dust releasing, and nonirritant gas generates.
Description
Technical field
The present invention relates to a kind of high-performance compound slab absorbing materials and preparation method thereof, can be with working frequency in 700MHz
Radar electromagnetic wave between~1000MHz, absorption value are better than -15dB, and absorption value is better than -20dB after frequency 1GHz.
Background technique
High-performance compound slab absorbing material is a kind of by thunderstorm activity and to be converted into the spy that other energy consumptions fall
Different material can be used for reducing the cross jamming between adjacent antenna, prevent personal injury, reduce metal body surface electric current, there is choosing
Cover the domestic required part blocked of test wrapper with selecting.Original Electromagnetic Wave Absorbing Plate is single-layer absorption, since electromagnetic wave penetrates depth
Spend it is limited, by increase thickness improve absorbent properties be limited, good absorption performance is not achieved.Therefore it is multiple to develop high-performance
Closing plate absorbing material becomes the heat subject for improving absorbent properties.Because there is superposition interface in compound slab absorbing material,
The impedance matching at interface is key, by a large number of experiments, has obtained the parameter value of compound interface, i.e. dielectric constant (resistance value),
Its absorbent properties is greatly improved, while also saving cost.Therefore high-performance compound slab absorbing material has important warp
Ji value.
Summary of the invention
The present invention provides a kind of high-performance compound slab absorbing material, and working frequency is between 700MHz~1000MHz
Radar electromagnetic wave, absorption value is better than -15dB, and absorption value is better than -20dB after frequency 1GHz.
A kind of high-performance compound slab absorbing material of the present invention is put down by two layers of carburizing ladder spreading depth is different
Plate absorbing body composition, the plate absorber use impregnation method absorbent uniform adsorption into every strata urethane foam substrate
It is made.
In the present invention, the absorbent is made of water, acetylene carbon black, fire retardant, adhesive and auxiliary agent.
Preferably, acetylene carbon black and water are 1:17 and 1:34.6 in mass ratio, and dispersant dosage is acetylene carbon black quality
20~46.7%, carbon black granules diameter is 100nm.
Preferably, the different plate absorber of two layers of carburizing ladder spreading depth, a layer thickness 65mm, phosphorus content
For 1.21kg/m3；Another a layer thickness is 100mm, phosphorus content 7.75kg/m3。
It the invention also discloses a kind of preparation method of high-performance compound slab absorbing material, is distinguished using impregnation method
Absorbent uniform adsorption into two layers of polyurethane foam substrate, the different plate absorber of carburizing ladder spreading depth is made,
It is compound again to obtain compound slab absorbing material.
Preferably, the thickness portfolio ratio of two layers of plate absorber is 100:65 and 100:50.
High-performance compound slab absorbing material of the present invention is the multilayer polyurethane being distributed by low-density, soft carburizing ladder
Broadband absorber made of foamed plastics, structure are that absorbent is adsorbed on polyurethane foam plastics, frequency of use: 700MHz~
40GHz, Normal incidence reflectance rate are less than -15dB.Material is easy excision forming.It can be used for reducing the intersection between adjacent antenna
It interferes, prevents personal injury, reduces metal body surface electric current, selectively cover the domestic required part blocked of test wrapper.It should
Material surface be it is light blue, fire protecting performance is up to state standards B2 grade of GB8624, long-time service without dust releasing, it is nonirritant
Gas generates.
Detailed description of the invention
1 high-performance compound slab absorbing material reflectance map of Fig. 1 embodiment.
1 plate absorbing material reflectance map of Fig. 2 comparative example.
2 plate absorbing material reflectance map of Fig. 3 comparative example.
Specific embodiment
Embodiment 1:
One, prepared by sample 1
1 absorbent 1 of table formula
1, it is formulated according to table 1 and weighs first component (510g/6g/30g) and be successively put into its three kinds of materials by numeric order
With revolving speed high-speed stirred 20 minutes of 500 revs/min, i.e. component one in pill tank；
2, two kinds of materials of second component (80g/30g) are weighed successively to be added in component one, continue to stir 20 points with 500 revs/min
Clock, i.e. component two；
3, the component two after stirring grinder is squeezed into grind 25-30 minutes；
4, ground semi-finished product are stirred again with 300-450 revs/min of revolving speed, it is while stirring plus third group load weighted
Point 150g and auxiliary agent (defoaming agent) 5g is stirred 30 minutes, absorbent 1；
5, the viscosity and resistance of maceration extract (absorbent 1) are surveyed, it is desirable that 28 ± 2s of viscosity, resistance are not more than 3000 Ω；
6, the sponge substrate that need to be impregnated is placed on dipping tank two pressure plates by the quantity and disposing way of prescribed requirement
Between, start squeeze buttons, be immersed in substrate in impregnant and be squeezed, air is discharged, then slowly decompression, substrate is made to restore itself
Elastic force sucks impregnant, same cycle extrusion 8 times；
7, the sponge after rubbing each piece is placed on electronic scale and weighs, when weight is more than to control weight (5.1~5.4kg/
Pcs is calculated according to phosphorus content) upper limit when need to place on impregnator and to squeeze the mark until control weighs again, under weighing less than and controlling again
It then needs to impregnate again in limited time until weight is up to standard；
8, the qualified material of dipping is placed on drying frame, is neatly put by dipping group to designated place and is dried.Note: from dipping
Between into the transportational process of drying ground it is noted that prevent all may damage the collision phenomenon of product generation.Reach specified drying ground
It needs to check whether product placement has extruding, puts phenomena such as not positive after point；
9, dryness in the sun obtains sample 1:BPFLD100；It is with a thickness of 100mm.
Two, prepared by sample 2
2 absorbent 2 of table formula
1, it is formulated according to table 2 and weighs first component (519g/7g/15g) and be successively put into its three kinds of materials by numeric order
With revolving speed high-speed stirred 20 minutes of 500 revs/min, i.e. component one in pill tank；
2, two kinds of materials of second component (60g/22g) are weighed successively to be added in component one, continue to stir 20 points with 500 revs/min
Clock, i.e. component two；
3, the component two after stirring grinder is squeezed into grind 25-30 minutes；
4, ground semi-finished product are stirred again with 300-450 revs/min of revolving speed, it is while stirring plus third group load weighted
Point 135g and auxiliary agent (defoaming agent) 5g is stirred 30 minutes, absorbent 2；
5, the viscosity and resistance of maceration extract (absorbent 2) are surveyed, it is desirable that 250 ± 2s of viscosity, resistance are not more than 5000 Ω；
6, the sponge substrate that need to be impregnated is placed on dipping tank two pressure plates by the quantity and disposing way of prescribed requirement
Between, start squeeze buttons, be immersed in substrate in impregnant and be squeezed, air is discharged, then slowly decompression, substrate is made to restore itself
Elastic force sucks impregnant, same cycle extrusion 8 times；
7, the sponge after rubbing each piece is placed on electronic scale and weighs, when weight is more than to control weight (3.0~3.2kg/
Pcs is calculated according to phosphorus content) upper limit when need to place on impregnator and to squeeze the mark until control weighs again, under weighing less than and controlling again
It then needs to impregnate again in limited time until weight is up to standard；
8, the qualified material of dipping is placed on drying frame, is neatly put by dipping group to designated place and is dried.Note: from dipping
Between into the transportational process of drying ground it is noted that prevent all may damage the collision phenomenon of product generation.Reach specified drying ground
It needs to check whether product placement has extruding, puts phenomena such as not positive after point；
9, dryness in the sun obtains sample 2:BPFLD65；It is with a thickness of 65m.
Three, compound obtained high-performance compound slab of the present invention
10, sample 2 (BPFLD65) is superimposed with sample 1 (BPFLD100), and upper layer (sample 2) with a thickness of 65mm, phosphorus content is
1.21kg/m3；Lower layer's (sample 1) is with a thickness of 100mm, phosphorus content 7.75kg/m3, its absorbing property is tested, sees attached drawing 1.
Comparative example 1:
Sample 3 is prepared according to the essentially identical method of sample 1 in embodiment 1, the difference is that sample 3 is named as
BPFLD165；It is with a thickness of 165mm..Its absorbing property is tested, sees attached drawing 2.
Comparative example 2:
Sample 4 is prepared according to the essentially identical method of sample 2 in embodiment 1, the difference is that sample 4 is named as
BPFLD-F165；It is with a thickness of 165mm..Its absorbing property is tested, sees attached drawing 3.
Electromagnetic wave absorption performance:
Using the vector network analyzer of The 41st Institute of CETC model AV3672, survey
Trying frequency range: 10MHz~40GHz, resolution ratio: 1Hz measures the reflectivity of high-performance compound slab absorbing material, absorbs
Performance test curve is listed in illustrating attached drawing.
Fig. 1 is that embodiment 1 obtains the normal incident absorption coefficient of high-performance compound slab absorbing material, as can be known from Figure, when
For frequency in 700MHz, microwave absorption value is -19dB.When frequency is between 700MHz~1GHz, microwave absorption value is by -19dB
Increase to -25.3dB.
Fig. 2 is that comparative example 1 obtains the normal incident absorption coefficient of plate absorbing material, as can be known from Figure, when frequency exists
When 700MHz, it is -10.6dB that microwave absorption value, which improves,.When frequency is between 700MHz~1GHz, microwave absorption value improve for-
12.6dB。
Fig. 3 is that comparative example 2 obtains the normal incident absorption coefficient of plate absorbing material, as can be known from Figure, when frequency exists
When 700MHz, it is -8.6dB that microwave absorption value, which improves,.When frequency is between 700MHz~1GHz, microwave absorption value improve for-
11.6dB。
Claims (6)
1. a kind of high-performance compound slab absorbing material, which is characterized in that by the different plate of two layers of carburizing ladder spreading depth
Absorber composition, the plate absorber are made absorbent uniform adsorption into every strata urethane foam substrate using impregnation method
At.
2. high-performance compound slab absorbing material as described in claim 1, which is characterized in that the absorbent is by water, acetylene
Carbon black, fire retardant, adhesive and auxiliary agent composition.
3. high-performance compound slab absorbing material as claimed in claim 2, it is characterised in that acetylene carbon black and water are in mass ratio
For 1:17 and 1:34.6, dispersant dosage is the 20~46.7% of acetylene carbon black quality.
4. high-performance compound slab absorbing material as described in claim 1, which is characterized in that two layers of carburizing ladder distribution
The different plate absorber of thickness, a layer thickness 65mm, phosphorus content 1.21kg/m3；Another a layer thickness is 100mm, carbon containing
Amount is 7.75kg/m3。
5. a kind of preparation method of high-performance compound slab absorbing material is using impregnation method respectively absorbent uniform adsorption
Into two layers of polyurethane foam substrate, the different plate absorber of carburizing ladder spreading depth is made, then it is compound obtain it is compound flat
Plate absorbing material.
6. the preparation method of high-performance compound slab absorbing material as claimed in claim 5, which is characterized in that described two layers flat
The thickness portfolio ratio of plate absorbing body is 100:65 and 100:50.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811569889.XA CN109511255A (en) | 2018-12-21 | 2018-12-21 | High-performance compound slab absorbing material and preparation method thereof |
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| CN201811569889.XA CN109511255A (en) | 2018-12-21 | 2018-12-21 | High-performance compound slab absorbing material and preparation method thereof |
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| CN109511255A true CN109511255A (en) | 2019-03-22 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101449268B1 (en) * | 2013-04-15 | 2014-10-08 | 현대자동차주식회사 | Two layer composite for absorbing low frequency electromagnetic wave |
| CN106659104A (en) * | 2016-12-28 | 2017-05-10 | 南京南大波平电子信息有限公司 | Moisture-proof and antioxidant low-frequency electromagnetic wave absorbing materials |
-
2018
- 2018-12-21 CN CN201811569889.XA patent/CN109511255A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101449268B1 (en) * | 2013-04-15 | 2014-10-08 | 현대자동차주식회사 | Two layer composite for absorbing low frequency electromagnetic wave |
| CN106659104A (en) * | 2016-12-28 | 2017-05-10 | 南京南大波平电子信息有限公司 | Moisture-proof and antioxidant low-frequency electromagnetic wave absorbing materials |
Non-Patent Citations (1)
| Title |
|---|
| WAN-CHONG LI: "The electromagnetic wave absorbing properties of the silicon carbide/carbon foam material based on tetrakaidecahedron model", 《MATERIAL RESEARCH EXPRESS》 * |
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