CN105799261B - A kind of suction wave electromagnetic membrane and its manufacturing method - Google Patents
A kind of suction wave electromagnetic membrane and its manufacturing method Download PDFInfo
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- CN105799261B CN105799261B CN201610145090.2A CN201610145090A CN105799261B CN 105799261 B CN105799261 B CN 105799261B CN 201610145090 A CN201610145090 A CN 201610145090A CN 105799261 B CN105799261 B CN 105799261B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
- B32B15/082—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising vinyl resins; comprising acrylic resins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
- B32B37/156—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is calendered and immediately laminated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/16—Drying; Softening; Cleaning
- B32B38/164—Drying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
The invention discloses a kind of suction wave electromagnetic membrane and manufacturing methods, this method comprises: taking iron powder body, resin is added as adhesive, organic solvent is added as dispersing agent, then ball milling at normal temperature uses casting technique, slurry obtained is cast into the electromagnetic membrane of 20-100 μ m-thick on a thin film substrate；Then in 100-300 DEG C of progress vacuum solidification after the electromagnetic membrane single-layer or multi-layer being stacked.This method inhales wave electromagnetic membrane by wet process casting technique and the manufacture of vacuum solidification technique, and technique simplifies, at low cost, and absorbent contents are high, is easy to compound with other materials, is suitble to industrial production.The suction wave frequency band of finished product reaches 2-18GHz, and not only absorbing property is good, itself there is certain bearing capacity, can be widely applied.
Description
Technical field
The present invention relates to suction wave electromagnetic membrane and its manufacturing methods, more particularly to one kind to be cast to obtain film-form suction by wet process
Wave material and its manufacturing method.
Background technique
Absorbing material refers to a kind of material that can absorb the electromagnetic wave energy for projecting its surface, mainly can be by electromagnetism
Wave energy is converted into the energy of other forms and is dissipated, and in stealth technology, improves overall performance, safeguard protection, micro-
The Military and civil fields such as wave darkroom, improvement electromagnetic pollution are with a wide range of applications.Absorbing material generally by radio-radar absorber and
Basis material is combined, wherein what is played a major role is radio-radar absorber, conducting staple fiber, ferrite, metal are former at present
The resins base composite wave-absorbing material such as son is using main body.
Composite material made of Si-C conducting staple fiber and epoxy resin, by Si-C staple fiber and grafting imide group with
Epoxy resin modification by copolymerization is the structural material of matrix composition, and absorbing property is all very excellent.But the mechanics of this absorbing material
Performance is poor, needs the Material cladding good with other bearing capacitys, it is difficult to be applied to the higher instrument of thickness requirement.
In the prior art, radio-radar absorber is generally formed a film using common mill milling, but this method is to resin
Content requirement is higher, forms a film when absorbent contents are high difficult, it is difficult to the electromagnetic membrane of high-selenium corn agent content be made.
Summary of the invention
First technical problem that present invention needs solve is: in view of the deficiencies of the prior art, providing a kind of film forming absorption
Agent content height, the manufacturing method with the good suction wave electromagnetic membrane of certain bearing capacity, absorbing property.
Second technical problem that present invention needs solve is: in view of the deficiencies of the prior art, providing a kind of film forming absorption
Agent content is high, with the good suction wave electromagnetic membrane of certain bearing capacity, absorbing property.
Technical scheme is as follows:
A kind of suction wave electromagnetism film manufacturing method is the following steps are included: take a certain amount of resin to be dissolved in organic solvent, so
After iron powder body is added, ball milling obtains casting slurry at normal temperature, in the casting slurry mass ratio of resin and iron powder be 1:1-1:
19；
Then wet process casting technique is used, the casting slurry is cast into the electromagnetism of 20-100 μ m-thick on a thin film substrate
Film solidifies under 100-300 DEG C, 0-0.1MPa vacuum condition after the electromagnetic membrane single layer or multiple superposed, obtains inhaling wave electricity
Magnetic film.
Wherein, the partial size of the iron powder body is 50-100 mesh, and iron powder body is flake iron powder or spherical iron powder.
The mass ratio of resin and iron powder is preferably 1:3-1:19 in the casting slurry obtained by ball milling.
The resin is cyanate ester resin, epoxy resin, acrylate, any one in unsaturated polyester resin or two
Kind or more combination.The organic solvent be tetrahydrofuran, acetone, butanone, any one or two kinds in alcohol and with
On combination.Resin is as adhesive, and organic solvent is as dispersing agent.
The time of ball milling material (i.e. iron powder body, resin and organic solvent) is 3-24 hours at normal temperature, ratio of grinding media to material 1:
1-10:1.Soaking time when solidification is 1-6 hours.
The film substrate is preferably pvdf membrane (PVDF membrane).
When by the electromagnetic spectrum multiple superposed, the electromagnetic spectrum of middle layer first removes PVDF basilar memebrane and carries out lamination again.
Using a kind of suction wave electromagnetic membrane made from above-mentioned manufacturing method, which is single layer structure or several layers of electricity
Magnetic film composite construction, the electromagnetic membrane are the absorbing materials for being uniformly mixed with the resin of iron powder and being formed by wet process casting technique,
Iron powder mass content is 50%-95% in the electromagnetic membrane, and iron powder partial size is 50-100 mesh.
Wave electromagnetic membrane is inhaled using another kind made from above-mentioned manufacturing method, which is that 5-50 layers of electromagnetic membrane are compound
Structure, the electromagnetic membrane are the absorbing material for being uniformly mixed with the resin of iron powder and being formed by wet process casting technique, the electromagnetism
Iron powder mass content is 75%-95% in film, and iron powder partial size is 50-100 mesh；The suction wave frequency band of the suction wave electromagnetic membrane is 2-18GHz.
Wherein, the content of iron powder is identical or different in each layer electromagnetic membrane, and the layer of electromagnetic membrane is with a thickness of 20-100 μm.
The present invention solidifies by wet process casting technique casting film-forming and by the electromagnetic membrane after lamination, obtains having one
Determine the film-form absorbing material of bearing capacity；Due to using wet process casting technique, high-selenium corn agent content is can be used in when curtain coating
The slurry of (50%-95%), and then obtain the suction wave electromagnetic membrane of high-selenium corn agent content；Simultaneously because slurry sufficiently connects with casting knife
Touching, thus the electromagnetic membrane of uniform ground can be obtained；And by the way that, in 100-300 DEG C of vacuum solidification, this temperature can protect after lamination
Resin in card electromagnetic membrane sufficiently solidifies, and the iron powder in same electromagnetic membrane closely connects, resin and iron between different electromagnetic membranes
Powder is well-bonded, thus has certain bearing capacity；Simultaneously at this temperature, the absorbing property of absorbing material will not be broken
Bad, especially under vacuum conditions, ferrous powder granules will not be oxidized, and obtained suction wave electromagnetic membrane absorbing property is good, while also having
There is certain bearing capacity.
The present invention inhales wave electromagnetic membrane, at low cost, simple process, behaviour by wet process casting technique and the manufacture of vacuum solidification technique
Facilitate, absorbent contents are high, are easy to compound with other materials, are suitable for industrial production.The suction wave electromagnetic membrane finally obtained
Suction wave frequency band reach 2-18GHz, not only absorbing property is good, due also to this is as resin base, also has certain bearing capacity, can
To be widely applied.
Detailed description of the invention
Fig. 1 is the suction wave electromagnetic membrane structure sectional view that the embodiment of the present invention 3 obtains；
Fig. 2 is the wet process casting device structural schematic diagram that the present invention uses；
Fig. 3 is that 20 layers of structure that embodiment 2 obtains inhale absorbing property of the wave electromagnetic membrane in 2-18GHz frequency range (instead
Penetrate rate) figure；
It is attached marked in the figure: pvdf membrane volume 1, pvdf membrane 2, idler wheel 3, curtain coating box 4, slurry 5, casting knife 6, drying device 7, electricity
Magnetic film 8, electromagnetism film roll 10, PVDF substrate 11, electromagnetic membrane 12, electromagnetic membrane 13, inhales wave electromagnetic membrane 14 at shaft 9.
Specific embodiment
With reference to embodiments, the present invention will be further described for attached drawing.
Embodiment 1
Firstly, 250 grams of cyanate ester resin are scattered in 500ml solvent, dissolve cyanate ester resin sufficiently；Then it is added
The iron powder 750g of 50 mesh of partial size is put into ball grinder ball milling 5 hours at room temperature, obtains casting slurry, the casting slurry of preparation
With certain toughness and mobility.Wherein solvent is the mixed solution of tetrahydrofuran and acetone 1:1.
Referring to Fig. 2, casting slurry 5 is cast into electromagnetic membrane 8 by wet process casting technique on pvdf membrane 2.Described is wet
Method casting technique is stored in the casting slurry 5 after ball milling in curtain coating box 4, and the side of curtain coating box 4 is casting knife 6, casting knife 6
There is an idler wheel 3 below, casting slurry 5 is formed on pvdf membrane 2 by the edge of a knife since the rotation of idler wheel 3 drives pvdf membrane 2 to advance
Electromagnetic membrane 8, and dried in subsequent handling, drying temperature is 80 DEG C.By the adjustable stream of height for adjusting the edge of a knife in curtain coating
The thickness of the electromagnetic membrane 8 prolonged, edge height is 100 microns in the present embodiment, obtains the electromagnetic membrane 8 with a thickness of 50 microns.
After wet process curtain coating, obtaining scheduled suction wave electromagnetic membrane needs thickness and absorbing property to be achieved.
Finally by single layer electromagnetic membrane 8 under 0.1 MPa vacuum, in 180 DEG C of heat preservations, 4 hours progress curing process, make
Sample final molding obtains inhaling wave electromagnetic membrane, and wherein iron powder mass content is 75%.
Embodiment 2
Firstly, 100 grams of cyanate ester resin are scattered in 200ml solvent, dissolve cyanate ester resin sufficiently；Then it is added
The iron powder 900g of 50 mesh of partial size is put into ball grinder ball milling 4 hours at room temperature, obtains casting slurry, the casting slurry of preparation
With certain toughness and mobility.Wherein solvent is the mixed solution of tetrahydrofuran and acetone 1:1.
Referring to Fig. 2, by casting slurry 5(embodiment 2) electromagnetic membrane 8 is cast on pvdf membrane 2 by wet process casting technique.
The wet process casting technique is stored in casting slurry 5 in curtain coating box 4, and the side of curtain coating box 4 is casting knife 6, casting knife 6
There is an idler wheel 3 below, casting slurry 5 is formed on pvdf membrane 2 by the edge of a knife since the rotation of idler wheel 3 drives pvdf membrane 2 to advance
Electromagnetic membrane 8, and dried in subsequent handling, drying temperature is 85 DEG C.By the adjustable stream of height for adjusting the edge of a knife in curtain coating
The thickness of the electromagnetic membrane 8 prolonged, edge height is 100 microns in the present embodiment, obtains the electromagnetic membrane 8 with a thickness of 50 microns.
After wet process curtain coating, obtaining scheduled single layer electromagnetic membrane needs thickness (50 microns) to be achieved and absorbing property.
20 layers of electromagnetic membrane are finally subjected to lamination, under 0.1 MPa vacuum, 3 hours is kept the temperature at 200 DEG C and is consolidated
Change processing, makes sample final molding, and 20 layers of structure for obtaining 1mm thickness inhale wave electromagnetic membrane, and iron powder mass content is 90%.It will be this
The standard sample that 180mm x180mm is made in wave electromagnetic membrane is inhaled, tests its suction wave in 2-18GHz frequency range with arch method
Performance (reflectivity), test result is shown in Fig. 3.As can be seen from Fig. 3, standard sample all has suction wave in 2-18GHz frequency range
Performance, reflectivity is better than -5dB, and reaches absorption peak (- 32dB) in 4.7GHz, has good absorbing property.
Embodiment 3
150 grams of cyanate ester resin are scattered in 300ml solvent, dissolves cyanate ester resin sufficiently, 50 mesh of partial size is added
Iron powder 850g, be put into ball grinder at room temperature ball milling 6 hours casting slurry 31；100 grams of cyanate ester resin are dispersed again
In 200ml solvent, the iron powder 900g of 50 mesh of partial size is added in cyanate ester resin after completely dissolution, is put into ball grinder at room temperature
Obtain casting slurry 32 within ball milling 6 hours；Wherein, solvent is the mixed solution of tetrahydrofuran and acetone 1:1.
Referring to Fig.1, casting slurry 31 is cast the electromagnetism answered in pairs by wet process casting technique by Fig. 2 on a pvdf membrane
Film 12(is with embodiment 1)；Casting slurry 32 is cast on another pvdf membrane to the electromagnetism answered in pairs also by wet process casting technique
Film 13(is with embodiment 1).After wet process curtain coating, thickness, the absorbing property that scheduled two kinds of single layer electromagnetic membranes need are obtained.
2 layers of electromagnetic membrane 12 and 2 layer electromagnetic membrane 13 are finally subjected to lamination, need first to remove positioned at the electromagnetic membrane of middle layer
PVDF basilar memebrane, in 250 DEG C of heat preservations, 5 hours progress curing process, makes sample final molding, obtains under 0.1 MPa vacuum
Wave electromagnetic membrane 14 is inhaled to four-layer structure, iron powder mass content is 85% in electromagnetic membrane 12, and iron powder mass content is in electromagnetic membrane 13
11 be PVDF substrate in 90%, Fig. 1.
Embodiment 4
It prepares three kinds of casting slurries: 100 grams of cyanate ester resin being scattered in 200ml solvent, cyanate ester resin is sufficiently molten
The iron powder 900g of 50 mesh of partial size is added after solution, is put into ball grinder and obtains casting slurry 41 within ball milling 6 hours at room temperature.By cyanate
200 grams of resin are scattered in 400ml solvent, and the iron powder 800g of 50 mesh of partial size is added in cyanate ester resin after completely dissolution, are put into ball
Casting slurry 42 is obtained within ball milling 6 hours at room temperature in grinding jar.300 grams of cyanate ester resin are scattered in 600ml solvent again, cyanic acid
The iron powder 700g of 50 mesh of partial size is added in ester resin after completely dissolution, and slurry must be cast in ball milling 6 hours at room temperature by being put into ball grinder
Material 43.Solvent in three kinds of casting slurries is the mixed solution of tetrahydrofuran and acetone 1:1.
Referring to Fig. 2 and embodiment 1, three kinds of casting slurries 41,42,43 are passed through into wet process casting technique in pvdf membrane 2 respectively
On be cast into three kinds of electromagnetic membranes 41 ', 42 ', 43 '.And dried in subsequent handling, drying temperature is 85 DEG C.Knife in the present embodiment 4
Open height is adjusted to 90 microns, and the thickness of three kinds of electromagnetic membranes is 40 microns.
6 layers of electromagnetic membrane 41 ', 6 layers of electromagnetic membrane 42 ' and 6 layers of electromagnetic membrane 43 ' are finally subjected to lamination, in 0.1 MPa vacuum
Under atmosphere, in 130 DEG C of heat preservations, 4 hours progress curing process, make sample final molding, obtain 18 layers of structure and inhale wave electromagnetic membrane,
Each 6 layers of middle iron powder mass content 90%, 80% and 70%.
In the various embodiments described above, by adjusting, the height of 6 edge of a knife of casting knife is adjustable to be cast obtained electromagnetism in curtain coating
The thickness of film 8.According to design requirement, the thickness of electromagnetic membrane 8 can be adjusted in 20-100 μ m.
The time of ball milling material (i.e. iron powder body, resin and organic solvent) is 3-24 hours at normal temperature, and ratio of grinding media to material can be
1:1-10:1。
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all not depart from the protection scope of the claims in the present invention.
Claims (7)
1. a kind of suction wave electromagnetism film manufacturing method, it is characterised in that the following steps are included:
It takes a certain amount of cyanate ester resin to be dissolved in organic solvent, the iron powder that partial size is 50-100 mesh is then added, in room temperature
Under casting slurry obtained in 3-24 hours with ratio of grinding media to material 1:1-10:1 ball milling；Cyanate ester resin described in the casting slurry and iron powder
Mass ratio is 1:1-1:19；The organic solvent uses the mixed solution of tetrahydrofuran and acetone 1:1, or uses tetrahydro furan
It mutters；
Then wet process casting technique is used, the casting slurry is cast into the electromagnetism of 20-100 μ m-thick in PVDF thin film substrate
Film；After the electromagnetic membrane single layer or multiple superposed, solidifies 1-6 hours under 130-300 DEG C, 0-0.1MPa vacuum condition, make
Iron powder in same layer electromagnetic membrane closely connects, and the resin and iron powder between different layers electromagnetic membrane are well-bonded, obtains cyanate
Resin base inhales wave electromagnetic membrane.
2. inhaling wave electromagnetism film manufacturing method as described in claim 1, which is characterized in that the iron powder is flake iron powder or ball
Shape iron powder.
3. inhaling wave electromagnetism film manufacturing method as described in claim 1, which is characterized in that cyanate described in the casting slurry
The mass ratio of resin and iron powder is 1:3-1:19.
4. the manufacturing method of the suction wave electromagnetic membrane as described in claims 1 or 2 or 3, which is characterized in that by the electromagnetic membrane multilayer
When stacked, the electromagnetic membrane of middle layer first removes PVDF thin film substrate and carries out lamination again.
5. using a kind of suction wave electromagnetic membrane made from manufacturing method described in claim 1-4 any one, which is characterized in that should
Inhaling wave electromagnetic membrane is single layer structure or several layers of electromagnetic membrane composite construction, and the electromagnetic membrane is the cyanate for being uniformly mixed with iron powder
The absorbing material that resin is formed by wet process casting technique, iron powder mass content is 50%-95%, iron powder partial size in the electromagnetic membrane
For 50-100 mesh;The layer of the electromagnetic membrane is with a thickness of 20-100 μm.
6. using a kind of suction wave electromagnetic membrane made from manufacturing method described in claim 1-4 any one, which is characterized in that should
Inhaling wave electromagnetic membrane is 5-50 layer electromagnetic membrane composite construction, the electromagnetic membrane be uniformly be mixed with iron powder cyanate ester resin pass through it is wet
The absorbing material that method casting technique is formed, iron powder mass content is 75%-95% in the electromagnetic membrane, and iron powder partial size is 50-100
Mesh；For the layer of the electromagnetic membrane with a thickness of 20-100 μm, the suction wave frequency band for inhaling wave electromagnetic membrane is 2-18GHz.
7. inhaling wave electromagnetic membrane as claimed in claim 6, which is characterized in that wherein the content of iron powder is identical or not in each electromagnetic membrane
Together.
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| CN106739324B (en) * | 2016-12-13 | 2019-02-22 | 北京元六鸿远电子科技股份有限公司 | Multilayer electromagnetic shielding film and preparation method thereof |
| CN106587037A (en) * | 2016-12-15 | 2017-04-26 | 陕西科技大学 | Preparation method of Z-type ferrite and r-GO tape casting lamination microwave-absorbing composite material |
| CN115537024B (en) * | 2022-08-26 | 2024-04-09 | 奇遇新材料科技(佛山)有限公司 | Hydrophobic self-cleaning wave-absorbing electromagnetic film and preparation method thereof |
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| US20080311373A1 (en) * | 2007-06-12 | 2008-12-18 | Jen-Sung Hsu | Electromagnetic wave absorbing material and method for preparing the same |
| KR101565425B1 (en) * | 2010-09-28 | 2015-11-03 | 생-고뱅 퍼포먼스 플라스틱스 코포레이션 | Cast fluoropolymer film for bushings |
| CN104339510B (en) * | 2013-07-23 | 2018-04-27 | 深圳光启创新技术有限公司 | A kind of preparation method for inhaling ripple part and suction ripple part |
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Address after: Shenzhen Graduate School of Guangdong Province, Shenzhen City Xili 518055 Nanshan District University City Tsinghua University Patentee after: Tsinghua Shenzhen International Graduate School Address before: Shenzhen Graduate School of Guangdong Province, Shenzhen City Xili 518055 Nanshan District University City Tsinghua University Patentee before: GRADUATE SCHOOL AT SHENZHEN, TSINGHUA University |
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