CN110853861B - Magnetic separation sheet for wireless charging receiving end and preparation method thereof - Google Patents
Magnetic separation sheet for wireless charging receiving end and preparation method thereof Download PDFInfo
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- CN110853861B CN110853861B CN201911198440.1A CN201911198440A CN110853861B CN 110853861 B CN110853861 B CN 110853861B CN 201911198440 A CN201911198440 A CN 201911198440A CN 110853861 B CN110853861 B CN 110853861B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/04—Cores, Yokes, or armatures made from strips or ribbons
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
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Abstract
The invention belongs to the technical field of wireless charging, and discloses a magnetism isolating sheet for a wireless charging receiving end and a preparation method thereof. The magnetic separation sheet for the wireless charging receiving end is a composite material formed by alternately compounding a nanocrystalline sheet and a soft magnetic composite material layer, wherein the soft magnetic composite material layer contains soft magnetic powder and a high polymer binder, and the soft magnetic powder is scaly iron-based alloy magnetic powder. Due to the magnetic permeability of the soft magnetic composite layer, the magnetic line of force generated by the wireless charging system in the working process is more uniformly distributed in the magnetic separation sheet, and the transmission efficiency of the wireless charging system is further improved. In addition, in the micro-crushing treatment process, the soft magnetic composite layer material is vitrified or vulcanized under the action of pressure and temperature, so that the density and magnetism of the soft magnetic composite material are improved, and meanwhile, the caking property of the nano-crystal thin sheet and the soft magnetic composite layer is enhanced.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a magnetic separation sheet for a wireless charging receiving end and a preparation method thereof.
Background
With the rapid development of electronic technology, wireless charging technology gradually enters the daily life of people, and is applied to the fields of consumer electronics, industrial medical treatment and the like. The Qi standard is mainly adopted in a wireless charging system of a mobile phone at present, the application frequency is 100 kHz-200 kHz, and the power is usually small and does not exceed dozens of watts.
The wireless charging system mainly comprises a magnetism isolating sheet and a coil, wherein the magnetic conduction and shielding properties of the magnetism isolating sheet have important influence on the electric energy transmission efficiency of the system. Generally, the magnetic shield material mainly comprises a ferrite magnetic sheet and a nanocrystalline magnetic sheet, wherein the ferrite magnetic sheet has the characteristics of high magnetic conductivity, low loss and the like, and the nanocrystalline material has magnetic conductivity equivalent to that of ferrite after being subjected to fragmentation treatment, and the saturation magnetization intensity is much higher than that of ferrite, so that the nanocrystalline material is gradually becoming the mainstream magnetic shield material of a low-power wireless charging system.
However, nanocrystalline materials have a lower resistivity, resulting in greater eddy current losses when used at high frequencies, greatly affecting the efficiency of power transmission. An improved method is to carry out micro-crushing treatment on the nano-crystal, improve the resistivity of the nano-crystal and reduce the eddy current loss under high frequency. However, the thickness of the single-layer nanocrystalline magnetic sheet is only about 20 μm, which cannot meet the requirement of wireless charging, and generally 3-5 layers of nanocrystalline sheets need to be stacked for use.
Because the nanocrystalline thin sheet is extremely fragile and is extremely easy to damage in the fragmentation and lamination processes, the nanocrystalline thin sheet needs to be subjected to fragmentation treatment in the preparation process of the multilayer nanocrystalline magnetic shielding sheet, and then the multilayer nanocrystalline thin sheets subjected to fragmentation treatment are attached through double-sided adhesive tape to finally form the nanocrystalline magnetic shielding sheet so as to ensure the mechanical properties of the nanocrystalline magnetic shielding sheet.
At present, most of the magnetic shielding sheets used at the wireless charging receiving end of the mobile phone are composite structures of multilayer nanocrystalline sheets and alternately alternated adhesive layers. The existence of the adhesive layer can ensure that the nanocrystalline magnetic shielding sheet has certain mechanical property and flexibility, but also has some problems, such as: (1) the design space of the mobile phone is very narrow, the thickness of the magnetism isolating material at the wireless charging receiving end also needs to be strictly controlled, the glue layer is made of a non-magnetic material, and the volume of the glue layer in the whole magnetism isolating sheet accounts for about 20%, so that the space of the magnetic material is greatly occupied by the non-magnetic glue layer, and the magnetic property of the magnetism isolating sheet is reduced to a certain extent; (2) the structure of the magnetic shielding sheet is a multilayer composite structure formed by alternating multilayer nanocrystalline sheets and adhesive layers, and the adhesive layers separate adjacent nanocrystalline sheets, so that magnetic lines of force of the magnetic shielding sheet cannot be uniformly distributed in the magnetic shielding sheet in the working process, and the electric energy transmission efficiency in the wireless charging process is further influenced; (3) most of the adhesive layer is made of high-molecular materials, and the heat conductivity coefficient is poor, so that the heat dissipation of the whole wireless charging system is influenced; (4) a glue film price is comparatively expensive for in the wireless receiving end magnetism barrier material that charges, greatly increased wireless charging system's cost.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provides the magnetism isolating sheet for the wireless charging receiving end and the preparation method thereof.
In order to achieve the purpose of the invention, the magnetism isolating sheet for the wireless charging receiving end is a composite material formed by alternately compounding a nanocrystalline sheet and a soft magnetic composite material layer, wherein the soft magnetic composite material layer comprises soft magnetic powder and a high polymer binder, and the soft magnetic powder is scaly iron-based alloy magnetic powder.
Preferably, the soft magnetic powder is iron-silicon, iron-silicon-aluminum, iron-nickel and iron-nickel-molybdenum system magnetic powder; more preferably, the soft magnetic powder is a sendust or iron-nickel system magnetic powder.
Further, the high molecular binder is one or a mixture of more of epoxy resin, polyurethane, phenolic resin, acrylic resin, urea resin, nitrile rubber, chloroprene rubber and synthetic rubber.
Preferably, the soft magnetic composite material layer consists of sheet-shaped Fe-Si-Al soft magnetic powder and polyurethane, and the component of the Fe-Si-Al soft magnetic powder is Fe85Si9.6Al5.4Or consists of sheet iron-nickel soft magnetic powder and epoxy resin, wherein the component of the iron-nickel soft magnetic powder is Fe50Ni50。
Further, the nanocrystalline thin-film layer is not limited in composition, and is required to be suitable for wireless charging, and is preferably an iron-based nanocrystalline system.
Further, the weight percentage of the soft magnetic powder and the polymer binder in the soft magnetic composite material layer is 50-90: 10-50.
Furthermore, the soft magnetic composite material layer can also contain auxiliary materials, the auxiliary materials are additive materials which are beneficial to preparing the soft magnetic composite material layer for molding, the magnetic characteristics of the composite soft magnetic material are not influenced, and preferably, the weight percentage content of the auxiliary materials in the soft magnetic composite material layer is not higher than 1.5%.
Further, the thickness of the nanocrystalline sheet is 14-25 μm.
Further, the soft magnetic composite layer has a thickness of 5 μm to 30 μm, for example 5 μm to 15 μm.
Furthermore, the nanocrystalline thin sheets and the soft magnetic composite material layer are all multilayer, the number of the nanocrystalline thin sheets is m, and m is more than or equal to 2 and less than or equal to 6; the number of the soft magnetic composite material layer layers is n, and n is m-1.
On the other hand, the invention also provides a preparation method of the magnetic separation sheet for the wireless charging receiving end, which comprises the following steps:
(1) preparing slurry containing soft magnetic powder, a high-molecular binder, auxiliary materials and a solvent, uniformly mixing, coating the soft magnetic composite material on the surface of the nanocrystalline sheet by adopting casting, coating and spraying processes, adjusting the thickness of a soft magnetic composite layer, and removing the solvent to form a composite magnetic sheet;
(2) attaching a nanocrystalline sheet to the surface of the soft magnetic composite material layer of the composite magnetic sheet in the step (1), and realizing the close attachment of the nanocrystalline sheet and the soft magnetic composite material layer by means of the self-adhesive property of the soft magnetic composite material;
(3) repeating the step (1) and the step (2) to prepare a multilayer nano-crystal thin sheet and soft glutinous rice composite material alternate laminated structure;
(4) and (4) placing the composite magnetic sheet in the step (3) into a pair of roller presses with a heating function for micro-crushing treatment, and finally obtaining the magnetic separation sheet.
The method of the present invention requires heating function in roller press for vitrification conversion or sulfurization of high molecular material in the soft magnetic composite material layer of the composite magnetic sheet.
Further, the rolling pressure to the roller press is 50kg to 75kg, for example 60kg to 65 kg.
Further, the rolling speed of the double-roller press is 5m/min-10 m/min.
Further, the rolling times are 2-6 times, and the rolling is performed along the x-axis direction and the y-axis direction in sequence.
Compared with the prior art, the invention has the following advantages:
(1) compared with the traditional magnetism isolating sheet formed by bonding a plurality of layers of nanocrystalline thin sheets by glue, the magnetism isolating sheet provided by the invention is formed by compounding the nanocrystalline thin sheets and a soft magnetic composite material in a multi-layer mode, the soft magnetic composite layer has good magnetic conductivity, the occupation ratio of the magnetic material in the whole magnetism isolating sheet is greatly improved, the magnetism isolating sheet has higher magnetic conductivity, inductance and Q value, and the wireless charging efficiency is favorably improved;
(2) due to the magnetic permeability of the soft magnetic composite layer, magnetic lines of force generated by the wireless charging system in the working process are more uniformly distributed in the magnetism isolating sheet, and the transmission efficiency of the wireless charging system is further improved.
(3) In the traditional magnetic shield sheet preparation process, firstly, the nanocrystalline sheet is subjected to micro-crushing treatment, and then, layer-by-layer sticking molding is carried out. According to the invention, the multilayer nanocrystalline thin sheet and the soft magnetic composite layer are compounded and then subjected to micro-crushing treatment, so that the process is simpler and the cost is lower.
(4) In the micro-crushing treatment process, the soft magnetic composite layer material is vitrified or vulcanized under the action of pressure and temperature, so that the density and magnetism of the soft magnetic composite material are improved, and meanwhile, the cohesiveness of the nanocrystalline thin sheet and the soft magnetic composite layer is enhanced; in addition, simultaneously respectively to carrying out little fragmentation from two complete vertically directions, the nanocrystalline thin slice fragmentation after the processing is more even, is favorable to wireless charging system transmission efficiency's promotion.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention. It is to be understood that the following description is only illustrative of the present invention and is not to be construed as limiting the present invention.
The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
The technical features of the embodiments of the present invention may be combined with each other as long as they do not conflict with each other.
Example 1
The nano-crystal thin-film layer has the composition of 1K107B, namely Fe73.5Si13.5B9Nb3Cu1(weight percentage), the thickness of the thin slice is 20 μm, and the number of the layers of the nanocrystalline thin slice is 4;
the soft magnetic composite material layer consists of sheet-shaped Fe-Si-Al soft magnetic powder and polyurethane, wherein the component of the Fe-Si-Al soft magnetic powder is Fe85Si9.6Al5.4The average thickness of the scaly magnetic powder is 1.1 μm, the average size in the radial direction is 99.6 μm, and the number of layers of the soft magnetic composite material layer is 3. The thickness of the soft magnetic composite layer was 10 μm. The weight percentage of the soft magnetic powder and the high molecular binder is 85 percent of the soft magnetic powder and 15 percent of the high molecular binder.
The preparation method comprises the following steps:
(1) preparing slurry containing scaly iron-silicon-aluminum magnetic powder, polyurethane and absolute ethyl alcohol (solvent), uniformly mixing, coating the soft magnetic composite material on the surface of the nanocrystalline sheet by adopting a spraying process, and drying to remove the absolute ethyl alcohol to form a composite magnetic sheet;
(2) attaching a nanocrystalline sheet to the surface of the soft magnetic composite material layer of the composite magnetic sheet in the step (1), and realizing the close attachment of the nanocrystalline sheet and the soft magnetic composite material layer by means of the self-adhesive property of the soft magnetic composite material;
(3) and (3) repeating the step (1) and the step (2) to prepare a multilayer nano-crystal thin sheet and soft glutinous rice composite material alternating laminated structure.
(4) And (4) placing the composite magnetic sheet in the step (3) into a double-roller press for micro-crushing treatment. The roll pressing machine has a heating function, and the roll temperature is 150 ℃; the rolling pressure is 65 kg; the rolling speed was 8 m/min. The rolling times are 2 times, and the rolling is performed once along the directions of the x axis and the y axis. The total thickness of the obtained magnetic shielding sheet is 0.11 mm.
Comparative example 1
As comparative example 1 of example 1, the nanocrystalline sheet of example 1 was selected as a raw material, and subjected to a micro-crushing treatment by a roll machine, and the micro-crushed nanocrystalline sheets were adhered together by a double-sided tape, wherein the nanocrystalline sheet had 4 layers, the adhesive layer had 3 layers, the adhesive layer had a thickness of 10 μm, and the total thickness of the magnetic spacer sheet was 0.11 mm.
Example 2
The nano-crystal thin-film layer has the composition of 1K107B, namely Fe73.5Si13.5B9Nb3Cu1(weight percentage), the thickness of the thin slice is 16 μm, and the number of the layers of the nanocrystalline thin slice is 5;
the soft magnetic composite material layer consists of flaky iron-nickel soft magnetic powder and epoxy resin, wherein the component of the iron-nickel magnetic powder is Fe50Ni50The average thickness of the scaly magnetic powder was 0.9 μm, the average size in the radial direction was 132 μm, and the number of layers of the soft magnetic composite material layer was 4. The thickness of the soft magnetic composite layer was 10 μm. The weight percentage of the soft magnetic powder and the high molecular binder is 87 percent of the soft magnetic powder and 13 percent of the high molecular binder.
The preparation method comprises the following steps:
(1) preparing slurry containing scaly iron-nickel magnetic powder, polyurethane and absolute ethyl alcohol (solvent), uniformly mixing, coating the soft magnetic composite material on the surface of the nanocrystalline thin sheet by adopting a spraying process, and drying to remove the absolute ethyl alcohol to form a composite magnetic sheet;
(2) attaching a nanocrystalline sheet to the surface of the soft magnetic composite material layer of the composite magnetic sheet in the step (1), and realizing the close attachment of the nanocrystalline sheet and the soft magnetic composite material layer by means of the self-adhesive property of the soft magnetic composite material;
(3) and (3) repeating the step (1) and the step (2) to prepare a multilayer nano-crystal thin sheet and soft glutinous rice composite material alternating laminated structure.
(4) And (4) placing the composite magnetic sheet in the step (3) into a double-roller press for micro-crushing treatment. The roll pressing machine has a heating function, and the roll temperature is 160 ℃; the rolling pressure is 70 kg; the rolling speed was 8 m/min. The rolling times are 4 times, and the rolling is performed twice along the directions of the x axis and the y axis alternately. Finally obtaining the magnetic shielding sheet with the total thickness of 0.12 mm.
Comparative example 2
As comparative example 2 of example 2, the nanocrystalline sheet of example 2 was selected as a raw material, and subjected to a micro-crushing treatment by a roll machine, and the micro-crushed nanocrystalline sheets were adhered together by a double-sided tape, wherein the nanocrystalline sheet had 5 layers, the adhesive layer had 4 layers, the adhesive layer had a thickness of 10 μm, and the total thickness of the magnetic spacer sheet was 0.12 mm.
Example 3
The nano-crystal thin-film layer has the composition of 1K107B, namely Fe73.5Si13.5B9Nb3Cu1(weight percentage), the thickness of the thin slice is 16 μm, and the number of the layers of the nanocrystalline thin slice is 5;
the soft magnetic composite material layer consists of flaky iron-nickel soft magnetic powder and epoxy resin, wherein the component of the iron-nickel magnetic powder is Fe50Ni50The average thickness of the scaly magnetic powder is 0.9 μm, the average size in the radial direction is 131 μm, and the number of layers of the soft magnetic composite material layer is 4. The thickness of the soft magnetic composite layer was 20 μm. The weight percentage of the soft magnetic powder and the high molecular binder is 87 percent of the soft magnetic powder and 13 percent of the high molecular binder.
The preparation method comprises the following steps:
(1) preparing slurry containing scaly iron-nickel magnetic powder, polyurethane and absolute ethyl alcohol (solvent), uniformly mixing, coating the soft magnetic composite material on the surface of the nanocrystalline thin sheet by adopting a spraying process, and drying to remove the absolute ethyl alcohol to form a composite magnetic sheet;
(2) attaching a nanocrystalline sheet to the surface of the soft magnetic composite material layer of the composite magnetic sheet in the step (1), and realizing the close attachment of the nanocrystalline sheet and the soft magnetic composite material layer by means of the self-adhesive property of the soft magnetic composite material;
(3) and (3) repeating the step (1) and the step (2) to prepare a multilayer nano-crystal thin sheet and soft glutinous rice composite material alternating laminated structure.
(4) And (4) placing the composite magnetic sheet in the step (3) into a double-roller press for micro-crushing treatment. The roll pressing machine has a heating function, and the roll temperature is 160 ℃; the rolling pressure is 70 kg; the rolling speed was 8 m/min. The rolling times are 4 times, and the rolling is performed twice along the directions of the x axis and the y axis alternately. Finally obtaining the magnetic shielding sheet with the total thickness of 0.12 mm.
Comparative example 3
As comparative example 3 of example 3, the nanocrystalline sheet of example 3 was selected as a raw material, and subjected to a micro-crushing treatment by a roll machine, and the micro-crushed nanocrystalline sheets were adhered together by a double-sided tape, wherein the nanocrystalline sheet had 5 layers, the adhesive layer had 4 layers, the adhesive layer had a thickness of 6 μm, and the total thickness of the magnetic spacer sheet was 0.11 mm.
Example 4
The nano-crystal thin-film layer has the composition of 1K107B, namely Fe73.5Si13.5B9Nb3Cu1(weight percentage), the thickness of the thin slice is 20 μm, and the number of the layers of the nanocrystalline thin slice is 4;
the soft magnetic composite material layer consists of sheet iron-silicon soft magnetic powder and polyurethane, and the iron-silicon soft magnetic powder is FeSi3.5Cr0.1C0.01The average thickness of the scaly magnetic powder is 0.95 μm, the average size in the radial direction is 103 μm, and the number of layers of the soft magnetic composite material layer is 3. The thickness of the soft magnetic composite layer was 10 μm. The weight percentage of the soft magnetic powder and the high molecular binder is 85 percent of the soft magnetic powder and 15 percent of the high molecular binder.
The preparation method comprises the following steps:
(1) preparing slurry containing scale-shaped iron-silicon magnetic powder, polyurethane and absolute ethyl alcohol (solvent), uniformly mixing, coating the soft magnetic composite material on the surface of the nanocrystalline thin sheet by adopting a spraying process, and drying to remove the absolute ethyl alcohol to form a composite magnetic sheet;
(2) attaching a nanocrystalline sheet to the surface of the soft magnetic composite material layer of the composite magnetic sheet in the step (1), and realizing the close attachment of the nanocrystalline sheet and the soft magnetic composite material layer by means of the self-adhesive property of the soft magnetic composite material;
(3) and (3) repeating the step (1) and the step (2) to prepare a multilayer nano-crystal thin sheet and soft glutinous rice composite material alternating laminated structure.
(4) And (4) placing the composite magnetic sheet in the step (3) into a double-roller press for micro-crushing treatment. The roll pressing machine has a heating function, and the roll temperature is 150 ℃; the rolling pressure is 65 kg; the rolling speed was 8 m/min. The rolling times are 2 times, and the rolling is performed twice along the directions of the x axis and the y axis alternately. The total thickness of the obtained magnetic shielding sheet is 0.11 mm.
Comparative example 4
Comparative example 4, which is example 1, is different from example 1 in that the rolling pressure is 45 kg.
Comparative example 5
Comparative example 5, which is example 1, is different from example 1 in that the rolling speed is 12 m/min.
Comparative example 6
Comparative example 6 as example 1 is different from example 1 in that the number of rolling times is 1.
Comparative example 7
Comparative example 7 as example 1 is different from example 1 in that the number of rolling times is 8.
Comparative example 8
Comparative example 8 as example 1 is different from example 1 in that the rolling direction is only the x-axis direction.
Comparative example 9
Comparative example 9, which is example 3, differs from example 2 in that the soft magnetic composite layer has a thickness of 5 μm.
Comparative example 10
Comparative example 10, which is example 3, differs from example 2 in that the soft magnetic composite layer has a thickness of 15 μm.
Effects of the embodiment
And (3) blanking the magnetism isolating material into a circular ring with the outer diameter of 18.8mm and the inner diameter of 9.9mm for magnetic permeability test. The test equipment was de E4990A and the test frequency was 128 kHz. The magnetic conductivity is complex magnetic conductivity and comprises a real magnetic conductivity part mu 'and an imaginary magnetic conductivity part mu', wherein the higher the mu 'is, the better the magnetic conductivity characteristic of the magnetism isolating sheet is, and the lower the mu' is, the smaller the magnetic loss of the magnetism isolating sheet is. In order to more intuitively explain the influence of the magnetism isolating sheet on the transmission efficiency of the wireless charging system, a receiving end device of the wireless charging system, which is manufactured by IDT and has the model number of P9221-EVK, is adopted to carry out charging efficiency test, the system is 15 watts and meets the Qi standard, the magnetism isolating sheet is fixed on the back of the coil, a testing device is started, and the electric energy transmission efficiency is tested. The results are as follows:
compared with the test results of the comparative example 1 and the comparative example 1, the example 2 and the comparative example 2, and the example 3 and the comparative example 3, the magnetic sheet with the composite structure provided by the invention has the advantages of higher real part of magnetic permeability, stronger magnetic permeability, lower imaginary part, lower loss and higher electric energy transmission efficiency of a wireless charging system.
Comparing the test results of example 1 with comparative example 4, comparative example 5, comparative example 6, comparative example 7, and comparative example 8, example 1 has a higher electric energy transmission efficiency, and has a higher real part of permeability and a lower imaginary part of permeability. Pressure undersize, speed are too fast, the roll-in number of times is too little, the unilateral roll-in can lead to separating magnetic sheet to smash the processing inadequately a little, leads to separating magnetic sheet's loss higher, and then influences electric energy transmission efficiency, and the roll-in number of times is too much can make the excessive fragmentation of separating magnetic sheet, leads to magnetic conductivity real part to descend obviously, and then influences electric energy transmission efficiency. Therefore, the micro-pulverization treatment process parameters in the present invention need to be strictly defined.
It will be understood by those skilled in the art that the foregoing is merely exemplary of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A preparation method of a magnetic separation sheet for a wireless charging receiving end is characterized by comprising the following steps:
(1) preparing slurry containing soft magnetic powder, a high-molecular binder, auxiliary materials and a solvent, uniformly mixing, coating the soft magnetic composite material on the surface of the nanocrystalline thin sheet by adopting a spraying process, adjusting the thickness of a soft magnetic composite layer, and removing the solvent to form a composite magnetic sheet;
(2) attaching a nanocrystalline sheet to the surface of the soft magnetic composite material layer of the composite magnetic sheet in the step (1), and realizing the close attachment of the nanocrystalline sheet and the soft magnetic composite material layer by means of the self-adhesive property of the soft magnetic composite material;
(3) repeating the step (1) and the step (2) to prepare a multilayer nano-crystal thin sheet and soft glutinous rice composite material alternate laminated structure;
(4) placing the composite magnetic sheet in the step (3) into a pair of roller presses with a heating function for micro-crushing treatment, and finally obtaining the magnetic separation sheet;
the thickness of the nanocrystalline sheet is 14-25 μm; the thickness of the soft magnetic composite material layer is 5-30 μm;
the nanocrystalline thin sheets and the soft magnetic composite material layer are all multilayer, the number of the nanocrystalline thin sheets is m, and m is more than 2 and less than or equal to 6; the number of the layers of the soft magnetic composite material layer is n, and n = m-1;
the rolling times are 2-6 times, and the rollers are alternately rolled along the directions of the x axis and the y axis in sequence during rolling;
the rolling pressure of the roller press is 50kg-75 kg; the rolling speed of the roller press is 5m/min-10 m/min.
2. The magnetism-isolating sheet obtained by the preparation method of the magnetism-isolating sheet for the wireless charging receiving end according to claim 1, wherein the soft magnetic composite material layer contains soft magnetic powder and a polymer binder, and the soft magnetic powder is scaly iron-based alloy magnetic powder.
3. The magnetism-isolating sheet obtained by the preparation method of the magnetism-isolating sheet for the wireless charging receiving end according to claim 2, wherein the soft magnetic powder is iron-silicon, iron-silicon-aluminum, iron-nickel or iron-nickel-molybdenum system magnetic powder.
4. The magnetism-isolating sheet obtained by the preparation method of the magnetism-isolating sheet for the wireless charging receiving end according to claim 2, wherein the high polymer binder is one or a mixture of more of epoxy resin, polyurethane, phenolic resin, acrylic resin, urea resin, nitrile rubber, chloroprene rubber and synthetic rubber.
5. The magnetism-isolating sheet obtained by the method for preparing the magnetism-isolating sheet for the wireless charging receiving end according to claim 4, wherein the soft magnetic composite material layer is composed of sheet-shaped sendust soft magnetic powder and polyurethane, and the sendust magnetic powder is Fe85Si9.6Al5.4Or consists of sheet iron-nickel soft magnetic powder and epoxy resin, wherein the component of the iron-nickel soft magnetic powder is Fe50Ni50。
6. The magnetism-shielding sheet for the wireless charging receiving terminal according to claim 2, wherein the nanocrystalline thin-film layer is an iron-based nanocrystalline system.
7. The magnetism-isolating sheet obtained by the preparation method of the magnetism-isolating sheet for the wireless charging receiving end according to claim 2, wherein the weight percentage of the soft magnetic powder and the polymer binder in the soft magnetic composite material layer is 50-90: 10-50.
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