CN109041556A - Absorbing material and its preparation method and application - Google Patents
Absorbing material and its preparation method and application Download PDFInfo
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- CN109041556A CN109041556A CN201810778282.6A CN201810778282A CN109041556A CN 109041556 A CN109041556 A CN 109041556A CN 201810778282 A CN201810778282 A CN 201810778282A CN 109041556 A CN109041556 A CN 109041556A
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- sheet
- absorbing material
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- magnetosphere
- ball
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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
Abstract
The present invention relates to absorbing material fields, and in particular to a kind of absorbing material and its preparation method and application.The absorbing material includes magnetosphere and optional shielded layer, and the magnetosphere contains sheet-like magnetic powder, wherein the sheet-like magnetic powder is separated from each other, and along the axis direction parallelly distribute on of described magnetospheric one end to the other end in the magnetosphere.The absorbing material can be applied to electromagnetism interference, electromagnetic screen, OLED screen, in RFID tag.The absorbing material has the ability of preferably shielding properties and electromagnetic wave absorption.
Description
Technical field
The present invention relates to absorbing material fields, and in particular to a kind of absorbing material and its preparation method and application.
Background technique
With the rapid development of electronics industry, wireless charging technology is popularized, and 5G network is commercial to be approached step by step, people
To the Electro Magnetic Compatibility of each electronic product and reliability, more stringent requirements are proposed for safety.Modern electronic product, function
Stronger and stronger, electronic circuit also becomes increasingly complex, and electromagnetic interference (EMI) problem is more and more prominent, electromagnetism interference suction wave
Material gradually embodies his value.
EMC Design is actually to be directed to the electromagnetic interference generated in electronic product to carry out design optimization, is allowed to
The product for meeting various countries or regional EMC Standard can be become, and the design of many electronic products can not completely from the root
Electromagnetic interference is eliminated, the final solution of EMI problem just needs to use absorbing material at this time.
The application field of absorbing material is very wide:
5G communication is carried out by the principle of photoelectric conversion, compared to 4G network, the transmission speed of 5G network faster, EMI
Problem seriously affects the normal work of core component optical module, and absorbing material is needed to solve the problems, such as that this is extremely urgent.
RFID electronic label, the development that modern transportation stores industry be unable to do without the identification of electronic tag, and RFID electronic label is met
It cannot be normally identified to metal, pasting absorbing material on the rfid labels can solve this problem.
Electronic component electromagnetism interference, the electronic products such as mobile phone, computer that we use have many electronics on pcb board
Component, wherein core component is generally highly susceptible to the interference in the magnetic field of external magnetic field or the transmitting of other electronic components,
The operational efficiency for influencing core component can effectively shield external magnetic field to the device in core component surface mount absorbing material
Interference.
Electromagnetic screen, electromagnetic screen are the third generation display technologies after touch screens and capacitance plate, and writing because of it has " former pen
The characteristics of mark ", is typically employed in professional drawing, teaching, the special dimension of electronic signature, and electromagnetic screen needs in different environment
Steady operation, absorbing material then unify its working environment as suction wave layer.
OLED adds wireless charging, and the application of self-luminous organic diode screen breaks with tremendous force, and the low-intensity magnetic field of interior of mobile phone is not
Big interference can be caused to OLED screen curtain, OLED screen curtain can generate larger reaction to the magnetic field of wireless charging, solve this and ask
Topic also be unable to do without the support of absorbing material.
It solves the above problems, Wireless charging coil, which is built in mobile phone terminal, needs to face many technical problems, first
Absorbing material is needed to accomplish that magnetic conductivity is relatively high, so that the wave-absorbing effect of absorbing material is promoted, in addition, electronic product is lightening
Trend determines that absorbing material must be made thin, these just propose very high requirement to absorbing material.
Absorbing material preparation process in the prior art is complicated, the effect is unsatisfactory for electromagnetic wave absorption.
Summary of the invention
The purpose of the invention is to overcome, absorbing material preparation process of the existing technology is complicated, electromagnetic wave absorption effect
The bad problem of fruit provides a kind of absorbing material and its preparation method and application, the suction being prepared using the preparation method
Wave material has the ability of better shielding properties and electromagnetic wave absorption.
To achieve the goals above, first aspect present invention provides a kind of absorbing material, and the absorbing material includes magnetism
Layer and optional shielded layer, the magnetosphere contain sheet-like magnetic powder, wherein the sheet-like magnetic powder divides each other
From, and along the axis direction parallelly distribute on of described magnetospheric one end to the other end in the magnetosphere.
Second aspect of the present invention provides a kind of preparation method of above-mentioned absorbing material, method includes the following steps:
1) sheet-like magnetic powder is formed；
2) hydrogenation treatment is carried out to the sheet-like magnetic powder；
3) the sheet-like magnetic powder after hydrogenation treatment that step 2) obtains is mixed with insulating binder and carries out slurrying, obtained
Then the coating sizing-agent is coated with to form magnetosphere, and controls formation by coating sizing-agent in substrate surface or shielding layer surface
Sheet-like magnetic powder described in magnetosphere is separated from each other, and flat along the axis direction of described magnetospheric one end to the other end
Row is distributed in the magnetosphere；
4) hot pressing is carried out to the material that step 3) obtains, and optionally removes substrate.
Third aspect present invention provides a kind of absorbing material adopted and prepared with the aforedescribed process.
Fourth aspect present invention provide a kind of above-mentioned absorbing material or using above method preparation absorbing material in anti-electricity
Magnetic disturbance, electromagnetic screen, OLED screen, the application in RFID tag.
Through the above technical solutions, invention achieves below the utility model has the advantages that
1) present invention can effectively restore Powder Oxidation phenomenon caused by high-temperature heat treatment and ball milling by hydrogenation treatment,
The magnetic conductivity for utmostly improving absorbing material, enhances the suction wave efficiency of absorbing material；
2) present invention wraps up sheet Magnaglo using the mobility of insulating binder, keeps the sheet-like magnetic powder mutual
Separation, reduces the resistivity of absorbing material, to reduce absorbing material to the reflectivity of electromagnetic wave, makes the absorbing material
With higher magnetic field shielding performance；
3) present invention uses ball-milling technology, makes Magnetic Spherical powder flattening, the absorbing material finally obtained is effectively reduced
Thickness, and improve the magnetic conductivity of absorbing material；
4) present invention is produced by the way of coating, and step is simple, and operation is easy, and substantially increases production efficiency,
The absorbing material is set to carry out large-scale industrial production；
5) present invention increases magnetic field in coating or directing agent is added when slurrying, facilitates in unified slurry
Sheet-like magnetic powder direction, keep the sheet-like magnetic powder regularly arranged, to effectively prevent sheet-like magnetic powder
Reunite and stack, further decrease magnetic layer thickness, and then utmostly reduce final absorbing material thickness obtained, is not dropping
Under the premise of low absorbing material shielding properties, realize that product is lightening.
Detailed description of the invention
Figure 1A is of the invention only including the structural schematic diagram of magnetospheric absorbing material；
Figure 1B is the structural schematic diagram of the absorbing material including magnetosphere and shielded layer of the invention；
Fig. 2 is magnetospheric structural schematic diagram of the invention；
Fig. 3 is the mechanical milling process schematic diagram of Magnetic Spherical powder of the invention；
Fig. 4 is pulping process schematic diagram of the invention；
Fig. 5 is coating process schematic diagram of the invention；
Fig. 6 is hot pressing schematic diagram of the invention；
Fig. 7 is preparation method process flow chart of the invention；
Fig. 8 is the operation principle schematic diagram of field generator for magnetic of the invention；
Fig. 9 be in the embodiment of the present invention 1 spherical iron sial powder be successively heat-treated, ball milling and the dry sheet formed
The electron scanning micrograph of iron sial powder；
Figure 10 be in the embodiment of the present invention 2 ball shaped hydroxy iron powder be successively heat-treated, ball milling and the dry piece formed
The electron scanning micrograph of shape iron carbonyl powder.
Description of symbols
10 magnetosphere, 20 shielded layer, 30 substrate
101 Magnetic Spherical powder, 102 sheet-like magnetic powder, 103 additive
104 directing agent, 105 insulating binder, 11 coating sizing-agent
31 32 ball grinder of ball milling canister direction of rotation, 33 abrading-ball
41 mixing machine agitating shaft, 51 slurry conveying chamber, 52 field generator for magnetic
53 coating head, 54 exhaust pipe, 55 drying room
56 heating device, 57 cooling blasting device, 58 cooling chamber
59 finished product rewinding spools
Specific embodiment
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
First aspect present invention provides a kind of absorbing material, and as shown in Figure 1A, Figure 1B and Fig. 2, the absorbing material includes
Magnetosphere 10 and optional shielded layer 20, the magnetosphere 10 contain sheet-like magnetic powder 102, wherein the sheet-like magnetic powder
End 102 is separated from each other, and along the axis direction parallelly distribute on of one end of the magnetosphere 10 to the other end in the magnetism
In layer 10.
In the present invention, the uncontrollable factor being limited in actual production process, it is difficult to meet the sheet-like magnetic powder
102 are all separated from each other, and ensure that the sheet-like magnetic powder 102 reaches 100% ground parallelly distribute on, therefore, even if practical raw
There is the phenomenon that 2-3 sheet-like magnetic powder 102 is reunited and stacked in the sheet-like magnetic powder 102 during production, described parallel
Distribution refers to substantially parallel distribution, the 102 place in-plane of sheet-like magnetic powder and the 10 place in-plane of magnetosphere
Between in be greater than 0 and the angle less than 30 °, can be considered as the sheet-like magnetic powder 102 of the present invention phase each other
Mutually separation, and along the axis direction parallelly distribute on of one end of the magnetosphere 10 to the other end in the magnetosphere 10.
According to the present invention, the absorbing material includes that magnetosphere 10 and optional shielded layer 20 refer to, the absorbing material
It can only include magnetosphere 10, also may include magnetosphere 10 and shielded layer 20.When described when the absorbing material only includes magnetic
Property layer 10 when, the structural schematic diagram of the absorbing material is as shown in Figure 1A, when the absorbing material include magnetosphere 10 and shielding
When layer 20, the structural schematic diagram is as shown in Figure 1B.
According to the present invention, in order to make absorbing material magnetic conductivity with higher and electromagnetic shielding performance, the sheet
Magnaglo 102 is preferably sheet iron sial powder, flaky carbonyl iron powder end, sheet carbonyl nickel powder and sheet carbonyl cobalt dust
At least one of.
According to the present invention, in order to make the absorbing material further obtain higher effectiveness, it is preferable that described
The average piece diameter of sheet-like magnetic powder 102 is 10-300 μm, with a thickness of 0.1-2 μm, radius-thickness ratio 5-2000；It is highly preferred that institute
The average piece diameter for stating sheet-like magnetic powder 102 is 50-250 μm, with a thickness of 0.1-2 μm, radius-thickness ratio 100-2000.
According to the present invention, as shown in Figure 1B, the absorbing material includes magnetosphere 10 and shielded layer 20, the shielded layer 20
It being contacted with the magnetosphere 10, the lamination order of the shielded layer 20 and the magnetosphere 10 is not particularly limited, as long as two
Person contacts with each other.
According to the present invention, there is no particular limitation for the type of the shielded layer 20, as long as having conductive effect, example
Such as, the shielded layer 20 can be metal foil, at least one of conductive fabric and conducting resinl.Preferably, the shielded layer 20 is aluminium
At least one of foil, copper foil, conductive fabric and conducting resinl.
According to the present invention, in order to enable the absorbing material obtains optimal comprehensive performance, the thickness of the absorbing material
Should be moderate, the thickness of the absorbing material is preferably 0.02-0.5mm, such as absorbing material thickness can for 0.02mm,
In the range that any two in 0.05mm, 01.mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm and these point values are constituted
Arbitrary value.If the thickness of the absorbing material is excessively high, the lightening of electronic product cannot achieve, and reduce the suction wave material
The flexibility of material causes the application of the absorbing material limited；If the thickness of the absorbing material is too low, can not be managed
The electromagnetic wave absorption effect thought, and increase the difficulty of process implementing, in order to make the absorbing material have both excellent magnetic conductivity and
Flexibility, it is highly preferred that the absorbing material with a thickness of 0.03-0.1mm.
According to the present invention, under the precursor conditions that the absorbing material meets above-mentioned thickness range, the magnetosphere 10
Thickness can be 10-500 μm, and the thickness of the shielded layer 20 can be 1-100 μm.
Second aspect of the present invention provides a kind of method for preparing aforementioned absorbing material, and the preparation method process flow chart is such as
Shown in Fig. 7, method includes the following steps:
1) sheet-like magnetic powder 102 is formed；
2) hydrogenation treatment is carried out to the sheet-like magnetic powder 102；
3) the sheet-like magnetic powder 102 after hydrogenation treatment that step 2) obtains is mixed with insulating binder 105 and is made
Slurry, obtains coating sizing-agent, is then coated on 30 surface of substrate or 20 surface of shielded layer and to form magnetosphere 10 coating sizing-agent,
And it controls sheet-like magnetic powder 102 described in the magnetosphere 10 of formation and is separated from each other, and along one end of the magnetosphere 10
To the other end axis direction parallelly distribute in the magnetosphere 10；
4) hot pressing is carried out to the material that step 3) obtains, and optionally removes substrate 30.
According to the present invention, the forming process of the sheet-like magnetic powder 102 include: by Magnetic Spherical powder 101 successively into
Row heat treatment, ball milling and drying.
In the present invention, the Magnetic Spherical powder 101 requires preferable ductility, and being easy to ball milling is sheet, preferably
Ground, the Magnetic Spherical powder 101 can be at least one in spherical iron aluminum silicon powder, spherical carbonyl dust and ball shaped hydroxy powder
Kind, specifically, the spherical shape carbonyl dust can in spherical carbonyl iron powder, spherical carbonyl nickel powder and spherical carbonyl cobalt powder extremely
Few one kind；The ball shaped hydroxy powder can be ball shaped hydroxy iron powder and/or ball shaped hydroxy nickel powder.It is highly preferred that the spherical shape
The granularity of Magnaglo is 10-500 μm.
According to the present invention, the heat treatment process is not limited by equipment, heat treatment time, heat treatment mode etc., as long as
The object of the invention may be implemented, it is preferable that heat treatment process of the present invention carries out in heat-treatment furnace, carries out hot place
Reason is the internal stress in order to eliminate Magnetic Spherical powder 101, forms the resistance of sheet-like magnetic powder 102 when reducing ball milling, mentions
The magnetic property of high spherical shape Magnaglo 101；
As the preferred embodiment of the heat treatment, the heat-treatment temperature range can be 400-1000 DEG C, such as
Heat treatment temperature can be appointing in 400 DEG C, 500 DEG C, 600 DEG C, 700 DEG C, 800 DEG C, 900 DEG C, 1000 DEG C and these point values
Arbitrary value in two ranges constituted of anticipating, it is preferable that heat-treatment temperature range can be 600 DEG C -800 DEG C, specifically, institute
State heat treatment time can for 30-150min, such as can for 30min, 50min, 70min, 90min, 120min, 150min with
And the arbitrary value in the range that is constituted of any two in these point values, it is preferable that heat treatment time can be 50-
120min。
Ball milling of the invention is to reduce the thickness of absorbing material to make 101 flaking of Magnetic Spherical powder, is improved
Assimilation effect of the absorbing material to electromagnetic wave.Specific mechanical milling process is as shown in Figure 3: by the Magnetic Spherical powder after heat treatment
101 are placed in ball grinder 32, with abrading-ball 33 of different sizes, matching by a certain percentage, to spherical shape under the action of organic solvent
Magnaglo 101 carries out ball milling, and ball grinder 32 is moved according to direction of rotation shown in arrow 31 in Fig. 3, Magnetic Spherical powder 101
Flattening under the action of 33 rolling extrusion of abrading-ball, by ball milling slabbing Magnaglo 102；Wherein, the organic solvent plays
Dispersing ball Magnaglo 101, the effect for avoiding Magnetic Spherical powder 101 from reuniting, so that Magnetic Spherical powder 101 is easier quilt
Ball milling is opened.
According to the present invention, in order to which the thickness of the absorbing material finally obtained is effectively reduced, and the magnetic conductance of absorbing material is improved
Rate, the condition of the ball milling is preferably so that the piece diameter of the sheet-like magnetic powder 102 formed is 10-300 μm, with a thickness of 0.1-2 μm,
Radius-thickness ratio is 5-2000.For example, the piece diameter of the sheet-like magnetic powder 102 can be 10 μm, 50 μm, 100 μm, 150 μm, 200 μ
M, the arbitrary value in range that any two in 250 μm, 300 μm and these point values are constituted, the sheet-like magnetic powder
The range that 102 thickness can be made of any two in 0.1 μm, 0.5 μm, 1 μm, 1.5 μm, 2 μm and these point values
In arbitrary value, the radius-thickness ratio of the sheet-like magnetic powder 102 can for 5,10,20,30,40,50,80,100,120,150,
200 and these point values in the range that is constituted of any two in arbitrary value.It is highly preferred that the condition of the ball milling makes
The piece diameter of the sheet-like magnetic powder 102 of formation is 50-250 μm, with a thickness of 0.1-2 μm, radius-thickness ratio 100-2000.
Under preferable case, it is 1L's compared to volume that the ball milling condition, which may include: that the diameter of abrading-ball 33 is 2-10mm,
Ball grinder, the quantity of abrading-ball are 50-300, and the material of the abrading-ball can be low-carbon alloy steel ball, medium carbon alloy steel ball, height
At least one of manganese steel ball and rare earth chromoly ball, ratio of grinding media to material 10-50.
According to the present invention, in order to make the utmostly flattening of sheet-like magnetic powder 102 obtained, it is further preferred that institute
Stating mechanical milling process and using 3 kinds of diameters is respectively that the abrading-ball 33 of 2-3mm, 5-6mm and 7-8mm are carried out by number ratio for 3-5:5-7:1.
In the present invention, the ratio of grinding media to material refers to the weight ratio of material and abrading-ball in ball mill, illustrates in certain ball milling
Under canned carrying capacity in mechanical milling process in ball grinder retaining amount size.
According to the present invention, organic solvent used in mechanical milling process can be ethyl alcohol, the dosage of the ethyl alcohol and the ball
The weight ratio of the dosage of shape Magnaglo 101 can be 10-50.
The intermittent cycle wet ball grinding it is further preferred that the ball milling method that the present invention uses is positive/inverts uses ball
Mill-stall cycles carry out, and every ball milling 10-40min shuts down interval 10-40min；As the preferred embodiments of the invention, ball milling
Total time can be 1-100h, it is preferable that ball milling total time can be 20-70h, and specifically, such as ball milling total time can be
The arbitrary value in range that any two in 1h, 8h, 20h, 50h, 70h, 100h and these point values are constituted；As this hair
Bright preferred embodiment, drum's speed of rotation can be 100-500rpm when ball milling, it is preferable that drum's speed of rotation can be with when ball milling
It specifically, such as can be 100rpm, 200rpm, 300rpm, 400rpm, 500rpm and these point values for 200-400rpm
In the range that is constituted of any two in arbitrary value.
According to the present invention, the drying can take the drying mode of this field routine, as long as dry powder can be obtained
, it is preferable that drying mode can be drying, dry the routine operation for this field, drying device therefor, drying time,
Drying temperature etc. is unrestricted, as long as can be dry by powder.As the preferred embodiments of the invention, the drying temperature
Degree can be 40-120 DEG C, and specifically, drying temperature can be 40 DEG C, 60 DEG C, 80 DEG C, 100 DEG C, 120 DEG C and these point values
In the range that is constituted of any two in arbitrary value；Drying time can be 30-300min, it is preferable that drying time can
Think 90-210min, specifically, such as drying time can for 30min, 60min, 90min, 120min, 150min,
Appointing in the range that any two in 180min, 210min, 250min, 280min, 300min and these point values are constituted
Meaning value.
In step 2) of the present invention, the sheet-like magnetic powder 102 is subjected to hydrogenation treatment, caused by eliminating because of mechanical milling process
Internal residual stress, restore the sheet-like magnetic powder 102 because of low-level oxidation phenomenon caused by mechanical milling process.As of the invention
Preferred embodiment, the hydrotreated temperature can be 400-1000 DEG C, it is preferable that hydrotreated temperature can be
600-800 DEG C, specifically, such as can for 400 DEG C, 500 DEG C, 600 DEG C, 700 DEG C, 800 DEG C, 900 DEG C, 1000 DEG C and these
The arbitrary value in range that any two in point value are constituted；Hydrogenation time can be 30-150min, specifically, example
As the hydrotreated time can be in 30min, 50min, 80min, 100min, 120min, 150min and these point values
The arbitrary value in range that any two are constituted, it is preferable that hydrogenation time can be 50-100min.
As the preferred embodiment of step 2) of the present invention, the hydrogenation treatment can carry out under protective atmosphere, preferably
Ground, the protective atmosphere are provided by nitrogen and/or inert gas, and the inert gas is any inert gas being contemplated that,
Preferably argon gas and/or helium, the volumetric concentration of hydrogen is 0.1-2% in hydrogenation treatment environment, specifically, such as the body of hydrogen
In the range that product concentration can be made of any two in 0.1%, 0.5%, 1%, 1.5%, 2% and these point values
Arbitrary value, it is preferable that the volumetric concentration of hydrogen is 1-2% in hydrogenation treatment environment.
In step 3) of the present invention, the slurrying is the routine operation of this field, pulping equipment, mixing time and stirring speed
Degree etc. is unrestricted, as long as the object of the invention may be implemented.As the preferred embodiments of the invention, the sheet-like magnetic
The dosage weight ratio of 105 the two of powder 102 and insulating binder can be specifically 6-15:12,8 for 6-15:12:
12, the arbitrary value in the range that any two in 10:12,13:12,15:12 and these point values are constituted, specific slurrying
Process is as shown in Figure 4: insulating binder 105 and sheet-like magnetic powder 102 are made under the stirring action of mixing machine agitating shaft 41
At coating sizing-agent 11.When the dosage weight ratio of the sheet-like magnetic powder 102 and both insulating binders 105 meets above-mentioned model
When enclosing, it can effectively control the sheet-like magnetic powder 102 and be distributed in being separated from each other in the magnetosphere 10.Such as preceding institute
It states, the uncontrollable factor being limited in actual production process, it is difficult to meet the sheet-like magnetic powder 102 and is all separated from each other,
Therefore, even if sheet-like magnetic powder described in actual production process 102 2-3 sheet-like magnetic powder 102 occurs and reunites and stack
The phenomenon that can still be considered as the sheet-like magnetic powder 102 and be separated from each other.
According to the present invention, the insulating binder 105 includes organic solvent and macromolecule resin, the insulating binder
105 can be commercial products, can also prepare in the following ways: as shown in figure 4, macromolecule resin is stirred in mixing machine
It mixes and is dissolved under the stirring action of axis 41 in organic solvent, stirring rate 100-300rpm, mixing time 5-15min, shape
At insulating binder 105.Organic solvent used is the organic solvent that can be arbitrarily dissolved in macromolecule resin, the macromolecule
Resin is the conventional macromolecule resin that this field prepares insulating binder, and specifically, such as organic solvent can be NMP (N- first
Base pyrrolidones), macromolecule resin can be TPU resin；The dosage mass ratio of organic solvent and macromolecule resin can be 3-
5:1, specifically, such as the dosage mass ratio of organic solvent and macromolecule resin can be 3:1,4:1,5:1 and these point values
In the range that is constituted of any two in arbitrary value.
In step 3) of the present invention, the coating process is as shown in figure 5, substrate 30 or shielded layer 20 are put on coating machine
Volume, by coating head, is coated with the slurry, solidification is then dried, wherein the thickness of the substrate 30 can be 2-100 μ
M, the thickness of the shielded layer 20 can be 1-100 μm, and the speed unreeled is 0.5-50m/min, and the wet film of the slurry is coated with
With a thickness of 10-600 μm, the temperature of dry solidification is 20-150 DEG C, and what is formed after dry solidification is magnetic layer by layer 10 with a thickness of 10-
500μm。
According to the present invention, when the absorbing material only includes magnetosphere 10, the coating process includes that substrate 30 exists
Coating is unreeled on coating machine；When the absorbing material includes magnetosphere 10 and shielded layer 20, the coating process includes that will shield
It covers layer 20 and unreels coating on coating machine, painting parameter is as described above.
According to the present invention, the substrate 30 can be release film, what the type of the release film can be conventional for this field
Release film, it is preferable that the release film is plastic film, and specifically, such as the release film can be PET film, PI film and PVC
Any one in film；The thickness of the substrate 30 can be 2-100 μm, such as the thickness of the substrate 30 can be 2 μm, 5 μ
M, any in the range that any two in 10 μm, 25 μm, 50 μm, 75 μm, 100 μm, 125 μm and these point values are constituted
Value, it is preferable that the substrate 30 with a thickness of 25-100 μm, more preferably 50-100 μm.
According to the present invention, the shielded layer 20 is as previously mentioned, can be at least the one of metal foil, conductive fabric and conducting resinl
Kind, the preferably at least one of aluminium foil, copper foil, conductive fabric and conducting resinl, it is highly preferred that the shielded layer is conductive fabric or copper
Foil, the thickness of the shielded layer can be 1-100 μm, for example, can for 1 μm, 2 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm,
It is any in the range that any two in 50 μm, 60 μm, 70 μm, 80 μm, 90 μm and 100 μm and these point values are constituted
Value.
As a kind of preferred embodiment of the invention, in step 3), sheet magnetic described in the magnetosphere 10 of formation is controlled
Axis direction parallelly distribute on method in the magnetosphere 10 in of the property powder 102 along one end of the magnetosphere 10 to the other end
It include: that can contribute to uniformly be coated in this way as shown in figure 8, carry out the process of the coating sizing-agent in the presence of magnetic field
The direction of sheet-like magnetic powder 102 in slurry 11 makes the sheet-like magnetic powder 102 is regularly arranged to be laid in substrate 30 or screen
20 surface of layer is covered, is further decreased by the thickness of its magnetosphere 10 formed, and then utmostly reduces final suction wave obtained
Material thickness realizes that product is lightening under the premise of not reducing absorbing material shielding properties.Specifically, as shown in figure 8, institute
Stating magnetic field can be generated by field generator for magnetic 52, and the field generator for magnetic 52 can be by the two sides phase above and below apparatus for coating
To the synonyms pole composition of setting, the sheet-like magnetic powder 102 in the coating sizing-agent 11 is produced in the field generator for magnetic 52
It is regularly arranged to be laid in 20 surface of substrate 30 or shielded layer, the magnetic that the field generator for magnetic 52 generates under raw magnetic fields
Field intensity can be 0.01-1T, and the magnitude of field intensity can be according to the distance between the synonyms pole being oppositely arranged
Regulated and controled.In order to which by the thickness control of the magnetosphere 10, in optimum range, the magnetic field strength is preferably 0.5-1T.
As another preferred embodiment of the invention, in step 3), sheet described in the magnetosphere 10 of formation is controlled
Axis direction parallelly distribute on side in the magnetosphere 10 in of the Magnaglo 102 along one end of the magnetosphere 10 to the other end
Method includes: that directing agent is added, obtains the coating sizing-agent containing directing agent 104 in pulping process, is then reused described containing fixed
It is coated to the coating sizing-agent of agent.Polar group when containing directing agent in the coating sizing-agent, in the directing agent 104
There is good attraction to the sheet-like magnetic powder 102, can securely attract the sheet-like magnetic powder 102, described
102 surface of sheet-like magnetic powder forms one layer of clad, as shown in Fig. 2, generating during coating film forming and tending to film air
The power at interface, and since 102 diameter areas of the sheet-like magnetic powder are much larger than thickness radial direction interfacial area, so can generate floating
Power is poor, soaks the sheet-like magnetic powder 102 with the insulating binder 105 and then promotes levelling, under levelling effect, applies
Cloth slurry forms a kind of convergent force in the drying process, so that forgotten about it in the upright sheet-like magnetic powder 102, thus
Generate orientation.And the sheet-like magnetic powder 102 has insulating binder 105, the sheet-like magnetic powder radially around
End 102 coating sizing-agent wet-film thickness it is more thin level off to the sheet-like magnetic powder 102 thickness when, can more be formed and institute
Stating magnetosphere 10 is in the angle for tending to 0 °, and the sheet-like magnetic powder 102 is made to arrive the other end along one end of the magnetosphere 10
Axis direction parallelly distribute on is in the magnetosphere 10.
According to the present invention, as previously mentioned, being limited to the uncontrollable factor in actual production process, it is difficult to ensure the sheet
Magnaglo 102 reaches 100% ground parallelly distribute on, therefore, even if where sheet-like magnetic powder described in actual production process 102
In 0 and the angle less than 30 ° is greater than between 10 place in-plane of in-plane and the magnetosphere, it can still be considered described
Shape Magnaglo 102 along one end of the magnetosphere 10 to the other end axis direction parallelly distribute in the magnetosphere 10.
According to the present invention, the directing agent 104 may include benzothiazole compound, acetate butyrate cellulose ester and poly- second
At least one of alkene waxy compound, it is preferable that described relative to the dosage of sheet-like magnetic powder 102 described in 100 parts by weight
The dosage of directing agent 104 is 0.1-2 parts by weight.
According to the present invention, it in above-mentioned pulping process, can also be added as needed in levelling agent, wetting agent and dispersing agent
At least one additive 103, further assist the sheet-like magnetic powder 102 to spread more evenly across in the slurry.It is excellent
Selection of land, the dosage of the additive 103 can be 0-2 parts by weight.
A kind of preferred embodiment according to the present invention, as shown in figure 5, the mode of the coating preferably includes: by substrate
30 or shielded layer 20 unreeled on coating machine, by coating head 53, field generator for magnetic 52, institute are provided at the coating head 53
It states field generator for magnetic 52 to be made of the synonyms pole that upper and lower two sides are oppositely arranged, when substrate 30 or the coated head 53 of shielded layer 20
When being coated with the coating sizing-agent 11, what the sheet-like magnetic powder 102 in the coating sizing-agent 11 was generated in field generator for magnetic 52
Regularly arranged to be laid in substrate surface under magnetic field, the substrate 30 or shielded layer 20 for being then coated with slurries 11 are unreeled with coating machine, first
By drying room 55, solidification is dried using the heat that heating device 56 provides, using cooling chamber 58, is blown using cooling
System 57 cools down, and is ultimately delivered to finished product rewinding spool 59 and collects the thin material semi-finished product, wherein the coating
Slurry 11 is sent into coating machine spiral by slurry conveying chamber 51, and the drying room 55 is additionally provided with exhaust pipe 55, applies for accelerating
The dry solidification speed of coating sizing-agent 11 is accelerated in the evaporation of organic solvent in cloth slurry 11.
In step 4) of the present invention, the heat-press step is also known as cross-linking step, and the absorbing material that coating is completed carries out
Linear macromolecule is formed net high-polymer, increases absorbing material toughness, controls the thickness and density of magnetosphere 10 by hot pressing,
And then control absorbing material magnetic property；The heat-press step be this field routine operation, hot pressing device therefor, hot pressing time,
Hot pressing speed etc. is unrestricted, and temperature and speed etc. can adjust according to the actual situation, as the preferred embodiments of the invention, institute
Stating hot pressing temperature can be 50-200 DEG C, such as hot pressing temperature can be 50 DEG C, 100 DEG C, 150 DEG C, 200 DEG C and these point values
In the range that is constituted of any two in arbitrary value, it is preferable that the hot pressing temperature is 100-150 DEG C；The hot pressing speed
Degree can be 0.5-30m/min, and specific hot pressing is as shown in fig. 6, magnetosphere 10 and substrate 30 are rolled repeatedly on hot press
Pressure, the absorbing material eventually formed with a thickness of 0.02-0.5mm, such as absorbing material thickness can for 0.02mm,
In the range that any two in 0.05mm, 01.mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm and these point values are constituted
Arbitrary value, it is preferable that absorbing material with a thickness of 0.1-0.3mm.It is highly preferred that the heat-press step, so that magnetism obtained
The density of layer 10 is 2-4g/cm3, can further ensure that the magnetosphere 10 can have both excellent magnetic property and flexure in this way
Performance.
According to the present invention, substrate 30 is optionally removed described in step 4) to refer to, when the absorbing material only includes magnetism
When layer 10, the hot pressing terminates later to further include removal substrate 30；When the absorbing material includes magnetosphere 10 and shielding
When layer 20, the coating process includes that shielded layer 20 is unreeled to coating on coating machine, does not include removal substrate 30 after hot pressing
The step of.
According to the present invention, the method for the removal substrate 30 can be mechanical stripping.
In a preferred embodiment of the invention, can also include: 5) to the hot pressing finished product of absorbing material carry out cross cutting or
Person cuts into the step of size needed for practical application.This step also belongs to the routine operation of this field, for being die cut or cutting
There is no limit as long as the size of available needs for tool used.For example, when the absorbing material is used to be used as electronics
When the electromagnetic screen of product device, the hot pressing finished product of the absorbing material can be die cut or cut into 1-500mm (length) × 1-
Circle, ellipse and other irregular geometric figures that the rectangle specification or radius of curvature of 500mm (width) is 1-250mm
Specification.
Third aspect present invention provides a kind of absorbing material prepared using the above method.
Fourth aspect present invention provides a kind of absorbing material in electromagnetism interference, electromagnetic screen, OLED screen, RFID tag
Using.Specifically, the absorbing material is suitable for the electromagnetism interference of the equal components of circuit board or CPU, and the absorbing material can
It is 10KHz-50GHz with applicable frequency range.
The present invention will be described in detail by way of examples below, but protection scope of the present invention is not limited to that.
In following embodiment and comparative example, iron sial Magnaglo is purchased from upper sea green conspicuous new material Science and Technology Ltd.,
The trade mark is LH-FSA78；Resin is purchased from Lu Borun special type chemical industry (Shanghai) Co., Ltd., trade mark 80AT3；Copper foil is purchased from Shanghai
Lv He new material Science and Technology Ltd., trade mark LH-C10, with a thickness of 10 μm.
Embodiment 1
(1) the spherical iron sial powder that granularity is 100-300 μm is subjected to heat treatment 80min in 800 DEG C of heat-treatment furnace；
(2) as shown in figure 3, the spherical iron sial powder after heat treatment is carried out in the ball mill with the revolving speed of 300rpm
Positive/negative to turn intermittent cycle wet ball grinding, every ball milling 20min shuts down interval 40min, and Ball-milling Time is 50h, mechanical milling process altogether
In, using 3 kinds of diameters is respectively that the abrading-ball of 2mm, 5mm and 7mm are carried out by number ratio for 3:5:1, and ball milling tank volume is 5L, abrading-ball
Total quantity is 600, and the material of the abrading-ball is 440C stainless steel ball (high carbon alloy steel ball), presence of the ball milling in ethyl alcohol
The weight ratio of the dosage of lower progress, the dosage of the ethyl alcohol and the spherical iron sial powder is 18:1；
(3) by the 65 DEG C of drying 120min in an oven of the iron sial powder after ball milling, obtained sheet iron sial powder
Electron scanning micrograph is as shown in figure 9, the average piece diameter of the sheet iron sial powder is 50-250 μm, with a thickness of 0.1-
2 μm, radius-thickness ratio 100-2000；
(4) by the sheet iron sial powder after drying in the argon gas that hydrogen volume concentration is 1%, in 800 DEG C of baking oven
Carry out 80min hydrogenation treatment；
(5) as shown in figure 4, insulating sticky is made by TPU resin and organic solvent NMP under the stirring of mixing machine agitating shaft
Mixture, wherein the dosage molar ratio of the organic solvent NMP and TPU resin is 5:1；
(6) as shown in figure 4, by the sheet after the insulating binder that step (5) obtains and the hydrogenation treatment that step (4) obtain
Coating sizing-agent, the iron sial powder and insulating binder dosage is made under the stirring of mixing machine agitating shaft in iron sial powder
Weight ratio be 11:12；
(7) as shown in figure 5, the coating sizing-agent that step (6) is obtained passes through coating in the copper foil surface with a thickness of 10 μm
Mode forms magnetosphere, and the process of the coating includes: to unreel copper foil on coating machine, by coating head, is coated with the painting
Then solidification is dried in cloth slurry, wherein two sides are relatively set with synonyms pole formation magnetic field strength to the coating head up and down
For the magnetic field (as shown in Figure 8) of 0.8T, the speed unreeled is 5m/min, and the wet film coating thickness of the slurry is 35 μm, dry
Cured temperature is 150 DEG C, and the magnetic layer thickness formed after dry solidification is 30 μm, obtains absorbing material semi-finished product；
(8) as shown in fig. 6, the absorbing material semi-finished product that step (7) obtains are carried out hot pressing, hot pressing temperature on hot press
It is 150 DEG C, hot pressing time 15min, is finally made the absorbing material with a thickness of 0.04mm, the absorbing material includes magnetosphere
And shielded layer, structure is as shown in Figure 1B, and the magnetosphere contains sheet iron sial powder, and the sheet iron sial powder is each other
It is separated from each other, and along the axis direction parallelly distribute on of described magnetospheric one end to the other end in the magnetosphere.
Embodiment 2
Absorbing material is prepared according to the method for embodiment 1, unlike, it is 100-300 μm that step (1), which uses granularity,
Ball shaped hydroxy iron powder, in the pulping process of step (6), be additionally added polyethylene waxy compound directing agent, the iron aluminum silicon powder
The weight ratio of end and directing agent dosage is 50:1, and does not provide magnetic field when step (7) coating, and obtained absorbing material includes magnetism
Layer and shielded layer, the electron scanning micrograph for the sheet iron carbonyl powder that the magnetosphere contains is as shown in Figure 10, described
The average piece diameter of sheet iron carbonyl powder is 50-250 μm, with a thickness of 0.1-2 μm, radius-thickness ratio 100-2000, the sheet hydroxyl
Base iron powder is separated from each other, and along the axis direction parallelly distribute on of described magnetospheric one end to the other end in the magnetism
In layer.
Embodiment 3
Absorbing material is prepared according to the method for embodiment 1, unlike, the absorbing material only includes magnetosphere, knot
Structure is as shown in Figure 1A, and the coating process in step (7) includes: that will unreel on coating machine with a thickness of 10 μm of PVC film substrate, warp
Coating head is crossed, the coating sizing-agent is coated with, is then dried solidification, further includes mechanical stripping after hot pressing in step (8)
The PVC film substrate, obtained absorbing material only include magnetosphere, in the magnetosphere, the sheet iron sial powder
Average piece diameter is 50-250 μm, with a thickness of 0.1-2 μm, radius-thickness ratio 100-2000, sheet iron sial powder in the magnetosphere
It is separated from each other, and along the axis direction parallelly distribute on of described magnetospheric one end to the other end in the magnetosphere.
Embodiment 4
Absorbing material is prepared according to the method for embodiment 1, unlike, step (1) heat treatment temperature is 400 DEG C.
Embodiment 5
Absorbing material is prepared according to the method for embodiment 1, unlike, step (1) heat treatment temperature is 1000 DEG C.
Embodiment 6
Absorbing material is prepared according to the method for embodiment 1, unlike, the Ball-milling Time of step (2) is 1h, obtained suction
Wave material includes magnetosphere and shielded layer, and in the magnetosphere, the average piece diameter of the sheet iron sial powder is 100-250
μm, with a thickness of 0.5-2 μm, radius-thickness ratio 80-2000.
Embodiment 7
Absorbing material is prepared according to the method for embodiment 1, unlike, the Ball-milling Time of step (2) is 100h, is obtained
Absorbing material includes magnetosphere and shielded layer, and in the magnetosphere, the average piece diameter of the sheet iron sial powder is 150-
300 μm, with a thickness of 0.1-1.5 μm, radius-thickness ratio 150-2000.
Embodiment 8
Absorbing material is prepared according to the method for embodiment 1, unlike, the hydrotreating temperatures of step (4) are 1000 DEG C.
Embodiment 9
Absorbing material is prepared according to the method for embodiment 1, unlike, the hydrotreating temperatures of step (4) are 400 DEG C.
Embodiment 10
Absorbing material is prepared according to the method for embodiment 1, unlike, the volume fraction of hydrogen in step (4) argon gas
It is 0.5%.
Embodiment 11
Absorbing material is prepared according to the method for embodiment 1, unlike, the volume fraction of hydrogen in step (4) argon gas
It is 2%.
Embodiment 12
Absorbing material is prepared according to the method for embodiment 1, unlike, the magnetic field strength in step (7) is 0.05T, is obtained
To absorbing material include magnetosphere and shielded layer, in the magnetosphere, the sheet iron sial powder is separated from each other,
In greater than 0 and less than 15 ° between in-plane where in-plane where the sheet iron sial powder and the magnetosphere
Angle.
Comparative example 1
Absorbing material is prepared according to the method for embodiment 1, unlike, the protective atmosphere of step (4) is pure argon, is free of
Hydrogen does not carry out hydrogenation treatment to the sheet-like magnetic powder.
Comparative example 2
Absorbing material is prepared according to the method for embodiment 1, unlike, step (7) does not provide magnetic field when being coated with, final to make
In the absorbing material obtained, the sheet iron sial powder is in random distribution in the magnetosphere 10.
Comparative example 3
Absorbing material is prepared according to the method for embodiment 2, unlike, in the pulping process of step (6), poly- second is not added
Alkene waxy compound directing agent, and magnetic field is not provided when step (7) coating, in final absorbing material obtained, the sheet hydroxyl
Base iron powder is in random distribution in the magnetosphere 10.
Comparative example 4
Absorbing material is prepared according to the method for embodiment 1, unlike, step (1)-(4) are not carried out, directly using spherical
Iron sial powder carries out slurrying coating, is spherical Magnaglo in the magnetosphere 10.
Test case
Using WK6500B impedance analyzer, coil uses test1.0 coil, test frequency 100KHz, by what is prepared
Absorbing material magnetosphere is placed on coil towards test coil, the resin briquetting of diameter about 50mm is placed on absorbing material
Side, the inductance value and quality factor of the absorbing material that testing example 1-12 and comparative example 1-4 are obtained simultaneously record impedance analyzer
The data of display；Using E5071B Network Analyzer, test frequency 6GHz, according to the test method of IEC 62333-2-2006
S11 the and S21 parameter for the absorbing material that testing example 1-12 and comparative example 1-4 are obtained, test result are as shown in table 1.
Table 1
| Embodiment number | Inductance value/μ H | Quality factor q | S11 | S21 |
| Embodiment 1 | 8.67 | 27 | -0.75dB | -23dB |
| Embodiment 2 | 8.28 | 25 | -0.71dB | -22dB |
| Embodiment 3 | 8.18 | 23 | -0.61dB | -21dB |
| Embodiment 4 | 7.24 | 19 | -0.55dB | -18dB |
| Embodiment 5 | 7.31 | 19 | -0.55dB | -18dB |
| Embodiment 6 | 7.48 | 20 | -0.56dB | -19dB |
| Embodiment 7 | 7.95 | 22 | -0.60dB | -20dB |
| Embodiment 8 | 7.89 | 20 | -0.58B | -20dB |
| Embodiment 9 | 8.42 | 26 | -0.68dB | -21dB |
| Embodiment 10 | 8.47 | 26 | -0.70dB | -22dB |
| Embodiment 11 | 8.60 | 27 | -0.71dB | -22dB |
| Embodiment 12 | 8.78 | 28 | -0.81dB | -25dB |
| Comparative example 1 | 6.78 | 18 | -0.51dB | -25dB |
| Comparative example 2 | 6.10 | 13 | -0.52dB | -28dB |
| Comparative example 3 | 6.02 | 11 | -0.51dB | -30dB |
| Comparative example 4 | 5.86 | 10 | -0.50dB | -35dB |
Note: the inductance value in upper table indicates that a kind of quality index of energy storage device storage energy ability, quality factor indicate
The one kind of stored energy with the ratio between each cycle loss of energy in one energy storage device (such as inductance coil, capacitor), resonance circuit
Quality index, the inductance value and quality factor are higher, indicate that the ability of the electromagnetic wave absorption of the absorbing material is stronger, shielding
Performance is better；S11 indicates a kind of index of reflection of electromagnetic wave rate, and S21 indicates a kind of index of electromagnetic wave tansmittivity, the S11
Absolute value it is higher, the absolute value of the S21 is lower, indicate that the ability of the electromagnetic wave absorption of the absorbing material is stronger, shield
Performance is better.
It can be seen that the inductance and quality factor that hydrogenation treatment helps to improve absorbing material by the result of table 1, improve
The ability of material electromagnetic wave absorption；In heat treatment temperature appropriate, Ball-milling Time, hydrotreating temperatures, hydrotreated atmosphere
The absorbing material is processed under middle density of hydrogen and magnetic field strength, is helped that material is made preferably to discharge internal stress, is improved and inhale
The inductance and quality factor of wave material improve the ability of material electromagnetic wave absorption；Using suction wave prepared by preparation method of the present invention
In material, the magnetosphere contains sheet-like magnetic powder, and the sheet-like magnetic powder is separated from each other, and along the magnetosphere
One end to the other end axis direction parallelly distribute in the magnetosphere have better shielding properties and electromagnetic wave absorption
Ability.
The preferred embodiment of the present invention has been described above in detail, and still, the present invention is not limited thereto.In skill of the invention
In art conception range, can with various simple variants of the technical solution of the present invention are made, including each technical characteristic with it is any its
Its suitable method is combined, and it should also be regarded as the disclosure of the present invention for these simple variants and combination, is belonged to
Protection scope of the present invention.
Claims (15)
1. a kind of absorbing material, the absorbing material includes magnetosphere (10) and optional shielded layer (20), which is characterized in that institute
It states magnetosphere (10) and contains sheet-like magnetic powder (102), wherein the sheet-like magnetic powder (102) is separated from each other, and edge
One end of the magnetosphere (10) to the other end axis direction parallelly distribute in the magnetosphere (10).
2. absorbing material according to claim 1, wherein the sheet-like magnetic powder (102) be sheet iron sial powder,
At least one of flaky carbonyl iron powder end, sheet carbonyl nickel powder and sheet carbonyl cobalt dust；
Preferably, the average piece diameter of the sheet-like magnetic powder (102) is 10-300 μm, with a thickness of 0.1-2 μm, radius-thickness ratio 5-
2000。
3. absorbing material according to claim 1, wherein the absorbing material includes magnetosphere (10) and shielded layer
(20), the shielded layer (20) contacts with the magnetosphere (10), and the shielded layer (20) is metal foil, conductive fabric and conducting resinl
At least one；
Preferably, the shielded layer (20) is at least one of aluminium foil, copper foil, conductive fabric and conducting resinl；
It is highly preferred that the shielded layer (20) with a thickness of 1-100 μm.
4. absorbing material described in any one of -3 according to claim 1, wherein the magnetosphere (10) with a thickness of 10-
500 μm, the absorbing material with a thickness of 0.02-0.5mm.
5. a kind of method for preparing absorbing material described in any one of claim 1-4, which is characterized in that this method include with
Lower step:
1) sheet-like magnetic powder (102) are formed；
2) hydrogenation treatment is carried out to the sheet-like magnetic powder (102)；
3) the sheet-like magnetic powder (102) after hydrogenation treatment that step 2) obtains is mixed with insulating binder (105) and is made
Slurry, obtains coating sizing-agent, then is coated with to form magnetism on substrate (30) surface or shielded layer (20) surface by the coating sizing-agent
Layer (10), and control sheet-like magnetic powder (102) described in the magnetosphere (10) of formation and be separated from each other, and along the magnetism
Layer (10) one end to the other end axis direction parallelly distribute in the magnetosphere (10)；
4) hot pressing is carried out to the material that step 3) obtains, and optionally removes substrate (30).
6. according to the method described in claim 5, wherein, the forming process of the sheet-like magnetic powder (102) includes: will be spherical
Magnaglo (101) is successively heat-treated, ball milling and drying；
Preferably, the temperature of the heat treatment is 400-1000 DEG C, and the time of heat treatment is 30-150min；
Preferably, the condition of the ball milling makes the piece diameter for the sheet-like magnetic powder to be formed be 10-300 μm, with a thickness of 0.1-2 μ
M, radius-thickness ratio 5-2000；
Preferably, the temperature of the drying is 40-120 DEG C, and the dry time is 30-300min.
7. according to the method described in claim 6, wherein, the Magnetic Spherical powder is spherical iron aluminum silicon powder, spherical carbonyl powder
At least one of end and ball shaped hydroxy powder；
Preferably, the spherical carbonyl dust be in spherical carbonyl iron powder, spherical carbonyl nickel powder and spherical carbonyl cobalt powder at least
It is a kind of；
Preferably, the ball shaped hydroxy powder is ball shaped hydroxy iron powder and/or ball shaped hydroxy nickel powder；
It is highly preferred that the granularity of the Magnetic Spherical powder is 10-500 μm.
8. according to the method described in claim 6, wherein, the condition of the ball milling includes: that the ball milling carries out in the ball mill,
Wherein, the diameter of abrading-ball is 2-10mm in ball mill, and compared to the ball grinder that volume is 1L, the quantity of abrading-ball is 50-300,
The material of the abrading-ball be low-carbon alloy steel ball, medium carbon alloy steel ball, potassium steel ball and rare earth chrome molybdenum steel ball at least
One kind, ratio of grinding media to material 10-50；
Preferably, ball milling method is positive/inverts intermittent cycle wet ball grinding, every ball milling 10-40min interval 10-40min, institute
The revolving speed for stating ball milling is 100-500rpm, and ball milling temperature is 15-50 DEG C, and total Ball-milling Time is 1-100h.
9. the method according to any one of claim 5-8, wherein in step 2), the hydrotreated temperature is
400-1000 DEG C, the hydrotreated time is 30-150min, and the volumetric concentration of hydrogen is 0.1-2%, institute in hydrogenation treatment environment
It states protective atmosphere to be provided by nitrogen and/or inert gas, the inert gas is preferably argon gas and/or helium.
10. the method according to any one of claim 5-8, wherein in step 3), insulating binder (105) includes
Organic solvent and macromolecule resin, and the dosage mole of the substance of organic solvent and macromolecule resin is 3-5:1；
Preferably, the dosage weight ratio of the sheet-like magnetic powder (102) after hydrogenation treatment and insulating binder (105) is 6-15:
12。
11. the method according to any one of claim 5-8, wherein in step 3), the formation of the magnetosphere (10)
Mode includes: to unreel substrate (30) or shielded layer (20) on coating machine, by coating head, is coated with the slurry, then into
Row dry solidification, wherein the substrate (30) with a thickness of 2-100 μm, the shielded layer (20) with a thickness of 1-100 μm, put
The speed of volume is 0.5-50m/min, and the wet film coating thickness of the coating sizing-agent is 10-600 μm, and the temperature of dry solidification is
20-150 DEG C, the magnetosphere (10) formed after dry solidification is with a thickness of 10-500 μm；
Preferably, the shielded layer is metal foil, at least one of conductive fabric and conducting resinl, it is highly preferred that the metallic shield
Layer is at least one of aluminium foil, copper foil, conductive fabric and conducting resinl.
12. the method according to any one of claim 5-8, wherein in step 3), control the magnetosphere (10) of formation
Described in sheet-like magnetic powder (102) along one end of the magnetosphere (10) to the other end axis direction parallelly distribute in described
Method in magnetosphere (10) includes: to carry out the process of the coating sizing-agent in the presence of magnetic field, the magnetic field in the magnetic field
Intensity is 0.01-1T；
Alternatively, directing agent is added, obtains the coating sizing-agent containing directing agent in pulping process, described contain then is reused
The coating sizing-agent of directing agent is coated；
Preferably, the directing agent (104) includes benzothiazole compound, acetate butyrate cellulose ester and polyethylene wax class chemical combination
At least one of object；
It is highly preferred that the dosage relative to sheet-like magnetic powder (102) described in 100 parts by weight, the dosage of the directing agent (104)
For 0.1-2 parts by weight.
13. the method according to any one of claim 5-8, wherein in step 4), the temperature of the hot pressing is 50-
200 DEG C, hot pressing is to roll hot pressing, and hot pressing speed is 0.5-30m/min.
14. the absorbing material of the preparation of the method as described in any one of claim 5-13.
15. absorbing material described in any one of claim 1-4 and 14 is in electromagnetism interference, electromagnetic screen, OLED screen, RFID
Application in label.
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| CN112672626A (en) * | 2020-12-18 | 2021-04-16 | 成都佳驰电子科技有限公司 | Multi-band magnetic wave-absorbing film and preparation method thereof |
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Application publication date: 20181218 |