CN114613567A - Plastic soft magnetic conductive and wireless charging magnetic isolation device and preparation method and application thereof - Google Patents
Plastic soft magnetic conductive and wireless charging magnetic isolation device and preparation method and application thereof Download PDFInfo
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- CN114613567A CN114613567A CN202210382095.2A CN202210382095A CN114613567A CN 114613567 A CN114613567 A CN 114613567A CN 202210382095 A CN202210382095 A CN 202210382095A CN 114613567 A CN114613567 A CN 114613567A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/24—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
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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
- H01F41/0253—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 for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention discloses a plastic soft magnetic conductive and wireless charging magnetism isolating device, a preparation method and application thereof, wherein the raw materials of the product comprise the following components in percentage by weight: 5% -15% of an adhesive; the component M is more than or equal to 85 wt%; the component M is silicon-coated iron powder particles with magnetic conductivity mu larger than or equal to 50 and insulated from each other. The invention has simple production process, does not need high-temperature sintering, post-processing (grinding) and other procedures, and can realize the preparation of novel high-Bs high-efficiency plastic soft magnetic conductive and wireless charging magnetism isolating products with integrated oversized size, ultrathin thickness, complex structure, impact resistance and good mechanical strength; the product prepared by the process has stable magnetic conductivity and excellent magnetic conductivity, can be used in wireless charging occasions, has high charging efficiency reaching QI standard, and has high saturation magnetic flux density Bs, wherein Bs is as high as more than 1400 mT.
Description
Technical Field
The invention belongs to the technical field of magnetic material preparation, and particularly relates to a plastic soft magnetic conductive and wireless charging magnetism isolating device, and a preparation method and application thereof.
Background
The wireless charging magnetic separation sheet applied to the market at present is mostly prepared by sintering ferrite magnetic materials, and the magnetic separation sheet is prepared by adopting the ferrite magnetic materials.
Therefore, how to prepare a novel high-efficiency plastic wireless charging magnetic conductive and magnetic isolating material which is not easy to deform, integrates an oversized magnetic element, has an ultrathin complex structure, is a precise magnetic element, has impact resistance and good mechanical strength becomes the main direction of current research.
Disclosure of Invention
The invention aims to provide a plastic soft magnetic conductive and wireless charging magnetism isolating device, a preparation method and application thereof, and solves the problems that magnetic conductive and magnetism isolating sheets are fragile and easy to deform and cannot be integrated into an oversized, ultrathin and structurally complex plastic soft magnetic conductive and wireless charging magnetism isolating device in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a plastic soft magnetic conductive wireless charging magnetic isolation device, wherein the raw materials include the following components by weight: 5% -15 wt% of an adhesive; the component M is more than or equal to 85 wt%; wherein the component M is silicon-coated iron powder particles with the magnetic conductivity mu larger than or equal to 50 and insulated from each other.
According to the invention, the component M is iron powder silicon-coated iron-silicon-aluminum alloy with the magnetic conductivity mu not less than 50, or the component M is carbonyl iron powder particles with the magnetic conductivity mu not less than 50, or the component M is silicon-coated iron-silicon-aluminum/carbonyl iron powder particles with the magnetic conductivity mu not less than 50. Preferably, when the component M is silicon-coated iron-silicon-aluminum/carbonyl iron powder particles with the magnetic conductivity mu being more than or equal to 50, the weight ratio of the silicon-coated iron-silicon-aluminum particles to the silicon-coated carbonyl iron powder particles is 1: 9-9: 1; more preferably 4:6 to 6: 4.
According to the invention, the adhesive is selected from one or more of polyether ether ketone powder, polyether sulfone resin, polyurethane powder, nylon, polybutylene and polyethylene.
According to the invention, the component M is micro powder with the particle size of 50-800 meshes; the adhesive is micropowder with the particle size of 10-1000 meshes. Preferably, the component M accounts for more than 90wt% of the total proportion, and the particle size is 100-600 meshes.
According to the invention, the raw materials also comprise a toughening agent and/or a lubricant, wherein the toughening agent is POE (polyolefin elastomer) grafted maleic anhydride, and the addition amount of the toughening agent accounts for 0.5-3 wt% of the total proportion; the lubricant is paraffin wax, and the addition amount of the lubricant is 0.5-3 wt% of the total proportion.
According to another aspect of the present invention, there is provided a method for preparing any one of the above plastic soft magnetic, wireless charging and magnetic isolating devices, comprising the following steps: high-temperature banburying, namely adding the adhesive and the component M into a high-temperature banbury mixer according to a specified proportion to carry out banburying so as to uniformly mix the adhesive and the component M; and (3) granulation: the adhesive and the component M are subjected to high-temperature banburying and then prepared into composite particles by a granulator; molding: performing high-temperature injection molding or high-temperature die-casting molding on the composite material particles to obtain the plastic soft magnetic conductive and wireless charging magnetism isolating device; wherein the component M is silicon-coated iron powder particles with magnetic conductivity mu larger than or equal to 50 and insulated from each other; the adhesive accounts for 5-15 wt% of the total proportion; the component M accounts for more than 85wt% of the total specific gravity.
According to the invention, the temperature of high-temperature banburying is 150-460 ℃.
According to the invention, in the forming step, the forming temperature is 150-460 ℃.
According to the invention, the composite material particles are regular or irregular, and the granularity is controlled to be about 1-6 mm.
According to another aspect of the invention, the application of any one of the plastic soft magnetic permeability and wireless charging magnetism isolating devices in radar wireless power supply magnetic elements and automobile-end high-power wireless charging magnetism isolating pieces is further provided.
Compared with the prior art, the invention has the following beneficial effects:
1) the production process is simple, and the preparation of novel high-Bs high-efficiency plastic soft magnetic conductive and wireless charging magnetism isolating products with integrated oversized size (600 x 800MM), ultrathin (thinnest 0.3 MM) and complex structure (multi-step structure, precise size chain +/-0.03 level) and good impact resistance and mechanical strength can be realized without high-temperature sintering, post-processing (grinding) and other procedures.
2) The product prepared by the process has stable magnetic conductivity, high charging efficiency reaching QI standard when being used in wireless charging occasions, excellent magnetic conductivity, high saturation magnetic flux density Bs, and Bs as high as more than 1400mT, and the highest Bs of the commonly used magnetism isolating material ferrite magnetic core Bs in the market is 530 mT.
3) The product has the same volume and can bear larger magnetic field intensity, thereby generating larger magnetic field excitation and bearing larger power; the product has good stability, no deformation and impact resistance, and the production yield can reach more than 98%. In addition, the production equipment is simple, the input cost is low, and the adopted internal mixers, granulators, injection molding machines and the like are all of mature models in the market.
Drawings
FIG. 1 is a photograph of a wireless charging magnetic separator sheet obtained by the preparation method of the present invention;
fig. 2 is a schematic front structure view of the wireless charging magnetic separator sheet obtained by the preparation method of the present invention;
FIG. 3 is a schematic front view of a wireless charging magnetic-shielding sheet obtained by the preparation method of the present invention;
fig. 4 and 5 are photographs of the magnetic shielding sheet of the wireless charging receiving module of the smart watch obtained by the preparation method of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be emphasized that the specific embodiments described herein are merely illustrative of some, but not all, embodiments of the invention and are not to be considered as limiting. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a plastic soft magnetic conductive and wireless charging magnetism isolating product, which comprises the following raw materials, by weight, 5-15 wt% of an adhesive and 85wt% or more of a component M; the component M is silicon-coated iron powder particles with magnetic conductivity mu larger than or equal to 50 and insulated from each other.
Preferably, the component M is iron powder silicon-coated iron-silicon-aluminum alloy with the magnetic permeability mu not less than 50, or the component M is carbonyl iron powder particles with the magnetic permeability mu not less than 50, or the component M is silicon-coated iron-silicon-aluminum alloy/carbonyl iron powder particles with the magnetic permeability mu not less than 50 (the composition of the silicon-coated iron-silicon-aluminum alloy and the silicon-coated carbonyl iron powder particles). When the component M is silicon-coated iron-silicon-aluminum/carbonyl iron powder particles with the magnetic conductivity mu larger than or equal to 50, preferably, the weight ratio of the silicon-coated iron-silicon-aluminum particles to the silicon-coated carbonyl iron powder particles is 1: 9-9: 1; more preferably 4:6 to 6: 4.
The invention adopts silicon-coated iron-silicon-aluminum particles or silicon-coated carbonyl iron powder particles or a combination of the silicon-coated iron-silicon-aluminum particles and the silicon-coated carbonyl iron powder particles as raw materials, and aims to ensure that the iron powder particles have surface insulating layers, namely, the particles are insulated from each other, so that the iron powder particles are bonded together under the action of an alternating magnetic field to avoid the product from generating eddy current to generate heat.
The silicon-coated iron-silicon-aluminum or silicon-coated carbonyl iron powder particles adopted by the invention can be a commercially available product and can also be prepared by the following method: smelting silicon, aluminum and pure iron in a certain proportion into uniformly mixed molten iron at high temperature, pouring the mixed liquid nitrogen into a prepared deep well, and instantly changing the molten iron into nano-scale micro-particles-iron powder when the molten iron meets the ultralow temperature of-180 ℃. Similarly, proper phosphorus is added in the process of preparing the pure iron powder, and an oxide layer is generated on the surface of the iron powder, so that the carbonyl iron powder is obtained.
Preferably, the adhesive is micro powder with the particle size of 10-1000 meshes; the particle size of the component M (silicon-coated iron-silicon-aluminum/carbonyl iron powder) is 50-800 meshes, and the weight accounts for more than 85wt% of the total specific gravity. More preferably, the particle size of the component M is between 100 meshes and 600 meshes, and the weight accounts for more than 90wt% of the total proportion.
Preferably, the adhesive used in the present invention is selected from one or more of polyether ether ketone (PEEK), polyether sulfone resin (PES), polyurethane powder (TPU), nylon (PA6\ PA66), Polybutylene (PB) and Polyethylene (PE).
According to the invention, the raw material also comprises a toughening agent and/or a lubricant auxiliary component, wherein the toughening agent is selected from maleic anhydride, and the addition amount of the toughening agent accounts for 0.5-3 wt% of the total proportion; the lubricant is selected from paraffin, and the addition amount of the lubricant accounts for 0.5-3 wt% of the total specific gravity. Maleic anhydride is a light energy group with very strong polarity, so that the toughening agent and materials such as nylon and the like can be well combined. Maleic anhydride is tightly bonded to the elastomer by one polar bond and nylon by one polar bond, so that it can play a very strong bond compatibility role. The toughness and the formability of the product can be improved by adding auxiliary components.
According to another aspect of the invention, a method for preparing a plastic soft magnetic conductive wireless charging magnetic isolation device is also provided, which comprises the following steps: high-temperature banburying, namely adding the adhesive and the component M into a high-temperature banbury mixer according to the proportion to carry out banburying so as to uniformly mix the adhesive and the component M; and (3) granulation: the adhesive and the component M are subjected to high-temperature banburying and then prepared into composite particles by a granulator; molding: the composite material particles are molded by high-temperature injection molding or high-temperature die casting, and the high-temperature injection molding of a high-temperature injection molding machine is preferably adopted. The component M is silicon-coated iron powder particles with magnetic conductivity mu larger than or equal to 50 and insulated from each other; the adhesive accounts for 5-15 wt% of the total proportion; the component M accounts for more than 85wt% of the total specific gravity.
Preferably, the temperature of high-temperature banburying is 150-460 ℃. Banburying within the temperature range mainly considers that the application environment of the product can reach 120 ℃ or even higher, and ensures that the product can normally work in a high-temperature environment; otherwise, if the ambient temperature is too high, the product will melt and fail, and if the temperature is too low, the product will not adapt well to the high temperature working environment.
The granulator adopted by the invention is an extrusion granulator or a granule extraction granulator. The composite material particles obtained after granulation are regular or irregular in shape, and the granularity is controlled to be about 1-6 mm. If the granularity is too large or too small, the uniformity of product components and the overall fluidity of the material in the injection molding process of the next manufacturing procedure are influenced, and the composite material granules are controlled within the range by comprehensively considering the invention so as to ensure the overall production qualified rate of the product.
According to the present invention, in the molding step, the molding temperature is set to 150 to 460 ℃ depending on the composition of the binder. And controlling the forming temperature within the range to ensure that the product has higher magnetic conductivity stability and higher saturation magnetic flux density Bs.
The invention recombines the single high-permeability iron powder particles which are coated by silicon and aluminum in a loose state by using a small amount of adhesive to form a ferromagnetic product with uniform and closely distributed iron powder particles, so that the ferromagnetic product has higher magnetic permeability of iron, and simultaneously separates micro ferromagnets to generate a micro air gap between each micro ferromagnet, thereby avoiding the generation of eddy current to cause the self heating of the product under the action of a high-frequency magnetic field, and leading the product to play the roles of magnetic permeability and magnetic isolation.
In the prior art, the ferrite magnetic material is adopted for manufacturing, the ferrite magnetic material is easy to deform in high-temperature sintering, the yield of the product is extremely low and is only 50-60%, the cost is extremely high, and the mass production difficulty is very high. By adopting the formula and the process, the defects that the magnetic separation sheet is fragile and easy to deform and the like caused by high-temperature sintering are overcome, the ultrathin complex structure and the integrated large-size product are realized, and the manufacturing difficulty of the ferrite magnetic material product is greatly improved, so that the plastic wireless charging magnetic separation material and other products can be manufactured at high efficiency.
The product is particularly suitable for integrated ultra-thin precise magnetic elements (radar wireless power supply magnetic elements) with ultra-large size (600 x 800MM), ultra-thin (thinnest 0.3 MM), complex structure (multi-step structure) and high requirement on dimensional precision (precision dimension chain +/-0.03 level), high-power wireless charging magnetic isolation sheets at the automobile end, and can also be applied to small-sized precise magnetic elements and scenes of large size, high power, mechanical impact resistance and the like.
The technical solution of the present invention will be described in detail with reference to specific examples.
Component M in the following examples was purchased from Pasteur, Germany.
Example 1
1) High-temperature banburying: weighing nylon accounting for 8wt% of the total proportion and a component M accounting for 92wt% of the total proportion, wherein the component M is silicon-coated ferrum-silicon-aluminum/carbonyl iron powder particles with the magnetic conductivity of more than or equal to 50 (the weight ratio of the silicon-coated ferrum-silicon-aluminum to the silicon-coated carbonyl iron powder particles is 4: 6), and adding the silicon-coated ferrum-silicon-aluminum/carbonyl iron powder particles into a high-temperature internal mixer for internal mixing to ensure that the two are uniformly mixed, and the internal mixing temperature is 200 ℃.
2) And (3) granulation: uniformly mixing nylon and silicon-coated ferrum-silicon-aluminum/carbonyl iron powder particles with the magnetic conductivity of more than or equal to 50, and making into nylon composite particles with the size of rice grains by using a granulator (an extrusion granulator or a grain extraction granulator). The granules are regular or irregular in shape, and the granularity is controlled to be about 1 to 6 mm.
3) Molding: and (3) carrying out high-temperature injection molding on the obtained nylon composite material particles. The molding temperature was set to 220 ℃ in accordance with the composition in which the binder was nylon.
The photo of the prepared wireless charging magnetic separation sheet prepared in the example 1 is shown in fig. 1, the structure is shown in fig. 2 and fig. 3, the size is moderate, the outer diameter is 42.4mm, the bottom B is extremely thin, the thickness is 0.95mm, and the width of the frame A is only 0.9 mm.
The wireless charging magnetic separation sheet obtained by the method is a pot-shaped product, the structure is complete, no deformation is caused, and the product yield is up to 98%. The product in the example 1 is subjected to performance test by adopting a Bs test instrument, and the saturation magnetic flux density Bs is as high as more than 1400 mT.
The mechanical strength of the product is tested by adopting a free fall falling method, and the data is that the product is not damaged, deformed and cracked under the condition of no protection of free fall at the height of 1 m.
The A11 standard coil is placed at a slot position, and the inductance Ls is greater than 5.0mH under the condition of HP 4284100 KHz 1V, which shows that the product has excellent magnetic conductivity.
Example 2
1) High-temperature banburying: weighing nylon accounting for 5wt% of the total proportion, a component M accounting for 89wt% of the total proportion, a toughening agent POE grafted maleic anhydride accounting for 3wt% of the total proportion, and lubricant paraffin accounting for 3wt% of the total proportion, wherein the component M is silicon-coated ferrum-silicon-aluminum/carbonyl iron powder particles with the magnetic conductivity of more than or equal to 50 (the weight ratio of the silicon-coated ferrum-silicon-aluminum to the silicon-coated carbonyl iron powder particles is 4: 6), and adding the silicon-coated ferrum-silicon-aluminum/carbonyl iron powder particles into a high-temperature internal mixer for internal mixing to uniformly mix the two. The high-temperature banburying temperature is 150 ℃.
2) And (3) granulation: the nylon and the component M are uniformly mixed and then are made into nylon composite material particles with the size of rice grains by a granulator (an extrusion granulator or a grain extraction granulator). The granules are regular or irregular in shape, and the granularity is controlled to be about 1 to 6 mm.
3) Molding: the nylon composite material particles obtained above were subjected to high-temperature injection molding at a temperature of 150 ℃ in accordance with the composition in which the binder was nylon.
The wireless charging magnetic separation sheet obtained by the method has a complete structure, the size is moderate, the outer diameter is 42.4mm, the bottom B is extremely thin and reaches 0.3mm, the width of the frame A is only 0.9mm, no deformation exists, and the product yield reaches 98%.
And a Bs testing instrument is adopted to test the performance of the product, and the saturation magnetic flux density Bs is as high as more than 1400 mT. The mechanical strength of the product is tested by adopting a free fall falling method, and the data is that the product is not damaged, deformed and cracked under the condition of no protection of free fall at the height of 1 m.
A11 standard coil is adopted and placed at a wire slot position, and Ls is greater than 5.0mH under the condition of HP 4284100 KHz 1V, which indicates that the product has excellent magnetic conductivity.
Example 3
1) High-temperature banburying: weighing the raw materials according to the weight percentage, wherein the adhesive nylon accounts for 15 weight percent of the total proportion, the component M accounts for 85 weight percent of the total proportion, the component M is silicon-coated ferrum-silicon-aluminum with the magnetic conductivity of more than or equal to 50, the particle size of the silicon-coated ferrum-silicon-aluminum is between 100 meshes and 800 meshes and accounts for 90 percent, and adding the raw materials into a high-temperature internal mixer for internal mixing to ensure that the raw materials and the silicon-coated ferrum-silicon-aluminum are uniformly mixed, wherein the internal mixing temperature is 460 ℃.
2) And (3) granulation: nylon and silicon-coated iron-silicon-aluminum/carbonyl iron powder particles with the magnetic conductivity of more than or equal to 50 are uniformly mixed and then are made into nylon composite material particles with the size of rice grains by a granulator (an extrusion granulator or a grain extraction granulator). The granules are regular or irregular in shape, and the granularity is controlled to be about 1 to 6 mm.
3) Molding: and (3) carrying out high-temperature injection molding on the obtained nylon composite material particles. The molding temperature was set to 220 ℃ in accordance with the composition in which the binder was nylon.
As shown in fig. 4 and 5, the magnetic shielding sheet of the wireless charging receiving module of the smart watch obtained in embodiment 3 has a complete structure without any deformation, and the yield of the product is as high as 98%. Besides the function and effect of wireless charging, the precision mechanical dimension of the product can be realized with low cost, and the perfect assembly effect of the product in a narrow space is ensured. The product in the example 1 is subjected to performance test by adopting a Bs test instrument, and the saturation magnetic flux density Bs is as high as more than 1400 mT.
The mechanical strength of the product is tested by adopting a free fall falling method, and the data is that the product is not damaged, deformed and cracked under the condition of no protection of free fall at the height of 1 m.
The double-layer coil with the inner diameter of 15.9MM and 8.5 circles is placed at a slot position, and under the condition of using HP 4284100 KHz 1V, Ls is greater than 12.0mH, and the magnetic conductivity is excellent.
Therefore, the product prepared by the formula and the process can obtain an integrated ultra-large-size (600 x 800MM), ultra-thin (thinnest 0.3 MM), complex-structure (multi-step structure) and ultra-thin precision magnetic element (radar wireless power supply magnetic element) with high requirements on size precision (precision size chain +/-0.03 level), and a high-power wireless charging magnetic separation sheet at an automobile end, has stable magnetic conductivity and excellent magnetic conductivity, can achieve the QI standard in charging efficiency in a wireless charging occasion, has high saturation magnetic flux density Bs (saturation magnetic flux density) and Bs (saturation magnetic flux density) up to over 1400mT, and can be applied to small-size precision magnetic elements and scenes such as large size, high power, mechanical impact resistance and the like.
The foregoing is only a preferred application of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the technical principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (10)
1. The plastic soft magnetic conductive and wireless charging magnetic isolation device is characterized in that the raw materials comprise the following components in percentage by weight:
5-15 wt% of adhesive
The component M is more than or equal to 85 wt%;
wherein the component M is silicon-coated iron powder particles with the magnetic conductivity mu larger than or equal to 50 and insulated from each other.
2. The plastic soft magnetic-conductive wireless charging magnetism isolation device according to claim 1, wherein component M is iron powder silicon-coated sendust with a magnetic conductivity mu not less than 50, or component M is carbonyl iron powder particles with a magnetic conductivity mu not less than 50, or component M is silicon-coated sendust/carbonyl iron powder particles with a magnetic conductivity mu not less than 50;
preferably, when the component M is silicon-coated iron-silicon-aluminum/carbonyl iron powder particles with the magnetic conductivity mu being more than or equal to 50, the weight ratio of the silicon-coated iron-silicon-aluminum particles to the silicon-coated carbonyl iron powder particles is 1: 9-9: 1; more preferably 4:6 to 6: 4.
3. The plastic magnetically soft, magnetically permeable, wirelessly charged, magnetic isolation device according to claim 1, wherein the binder is selected from one or more of polyetherketonepowder, polyethersulfone resin, polyurethane powder, nylon, polybutylene, and polyethylene.
4. The plastic soft magnetic conductive, wireless charging and magnetic isolating device according to claim 1, wherein the particle size of the component M is 50-800 mesh; the adhesive is micropowder with the particle size of 10-1000 meshes;
preferably, the component M accounts for more than 90wt% of the total proportion, and the particle size is 100-600 meshes.
5. The plastic soft magnetic conductive wireless charging magnetic isolation device according to any one of claims 1 to 4, wherein the raw material further comprises a toughening agent and/or a lubricant, the toughening agent is POE grafted maleic anhydride, and the addition amount of the toughening agent is 0.5wt% -3 wt% of the total specific gravity; the lubricant is paraffin wax, and the addition amount of the lubricant is 0.5-3 wt% of the total proportion.
6. A method for preparing a plastic soft magnetic conductive wireless charging magnetic isolation device according to any one of claims 1 to 5, which comprises the following steps:
high-temperature banburying, namely adding the adhesive and the component M into a high-temperature banbury mixer according to a specified proportion to carry out banburying so as to uniformly mix the adhesive and the component M;
and (3) granulation: the adhesive and the component M are subjected to high-temperature banburying and then prepared into composite particles by a granulator;
molding: performing high-temperature injection molding or high-temperature die-casting molding on the composite material particles to obtain the plastic soft magnetic permeability and wireless charging magnetism isolating device;
wherein the component M is silicon-coated iron powder particles with magnetic conductivity mu larger than or equal to 50 and insulated from each other; the adhesive accounts for 5-15 wt% of the total proportion; the component M accounts for more than 85wt% of the total specific gravity.
7. The preparation method according to claim 6, wherein the temperature of the high-temperature banburying is 150-460 ℃.
8. The method according to claim 6, wherein in the molding step, the molding temperature is 150 ℃ to 460 ℃.
9. The preparation method according to claim 6, wherein the composite particles are regular or irregular in shape, and the granularity is controlled to be about 1-6 mm.
10. Use of the plastic soft magnetic conductive, wireless charging and magnetic isolating device according to any one of claims 1 to 5 in radar wireless power supply magnetic elements and high-power wireless charging and magnetic isolating sheets for automobile terminals.
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| CN112652434A (en) * | 2020-12-28 | 2021-04-13 | 横店集团东磁股份有限公司 | Thin film power inductance magnetic sheet and preparation method and application thereof |
| CN113223845A (en) * | 2021-04-25 | 2021-08-06 | 宁波中科毕普拉斯新材料科技有限公司 | Insulating coating method of soft magnetic alloy powder |
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| DE102012211053A1 (en) * | 2012-06-27 | 2014-01-02 | Robert Bosch Gmbh | Soft magnetic component and method for producing such |
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| CN111091946A (en) * | 2020-01-21 | 2020-05-01 | 柯昕 | Soft magnetic composite material for fluid filling process |
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| CN112652434A (en) * | 2020-12-28 | 2021-04-13 | 横店集团东磁股份有限公司 | Thin film power inductance magnetic sheet and preparation method and application thereof |
| CN113223845A (en) * | 2021-04-25 | 2021-08-06 | 宁波中科毕普拉斯新材料科技有限公司 | Insulating coating method of soft magnetic alloy powder |
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