CN112672626A - Multi-band magnetic wave-absorbing film and preparation method thereof - Google Patents
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- 230000002745 absorbent Effects 0.000 claims abstract description 45
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- 239000000843 powder Substances 0.000 claims abstract description 27
- 239000002002 slurry Substances 0.000 claims abstract description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 229920000642 polymer Polymers 0.000 claims abstract description 14
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000002270 dispersing agent Substances 0.000 claims abstract description 13
- 230000000737 periodic effect Effects 0.000 claims abstract description 13
- 239000002562 thickening agent Substances 0.000 claims abstract description 13
- 239000000080 wetting agent Substances 0.000 claims abstract description 13
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 7
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 7
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 4
- 229910000531 Co alloy Inorganic materials 0.000 claims abstract description 4
- 229910000599 Cr alloy Inorganic materials 0.000 claims abstract description 4
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims abstract description 4
- 239000004642 Polyimide Substances 0.000 claims abstract description 4
- XEVZIAVUCQDJFL-UHFFFAOYSA-N [Cr].[Fe].[Si] Chemical compound [Cr].[Fe].[Si] XEVZIAVUCQDJFL-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 4
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- 239000000788 chromium alloy Substances 0.000 claims abstract description 4
- 239000003822 epoxy resin Substances 0.000 claims abstract description 4
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- -1 iron-silicon-aluminum Chemical compound 0.000 claims abstract description 4
- 229910052751 metal Inorganic materials 0.000 claims abstract description 4
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- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 4
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- 229920005749 polyurethane resin Polymers 0.000 claims abstract description 4
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- 239000007787 solid Substances 0.000 claims description 43
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Abstract
The invention discloses a multi-band magnetic wave-absorbing film and a preparation method thereof, belonging to the technical field of magnetic materials and comprising a base film and magnetic absorbent slurry on the surface of the base film; the magnetic absorbent slurry comprises a magnetic absorbent, a liquid high molecular polymer and an auxiliary agent; the magnetic absorbent comprises one or more of flaky iron-based metal powder, flaky iron-based alloy powder, flaky iron-silicon-aluminum alloy powder, flaky iron-silicon-chromium alloy powder, flaky cobalt-based alloy powder and flaky iron-nickel alloy powder; the liquid high molecular polymer comprises one or more of polyurethane resin, silicone resin, acrylic resin, epoxy resin, polyimide and ethylene-vinyl acetate copolymer; the auxiliary agent comprises one or more of a dispersing agent, a flatting agent, a wetting agent, a thickening agent and a defoaming agent. Through the periodic modulation of the magnetic wave-absorbing film, the magnetic wave-absorbing film has a multi-band absorption effect, and a broadband electromagnetic interference suppression effect is realized under the condition of unchanged thickness.
Description
Technical Field
The invention belongs to the technical field of magnetic materials, and particularly relates to a multi-band magnetic wave-absorbing film and a preparation method thereof.
Background
In recent years, with the progress of electronic technology, electronic devices have been gradually miniaturized and thinned. Further, with the application of 5G technology, electronic devices are increasingly developed to the aspect of multi-band and wide-band integrated application. However, the development trend undoubtedly increases the design and manufacturing difficulty of electronic devices, and the problems of mutual interference and mutual compatibility of multiple frequency bands also become the key difficulty of the integrated design of the existing electronic devices.
In the design of the prior electronic equipment, the problem of electromagnetic compatibility between modules and between chips is often solved by adding a conductive shielding cover. The electromagnetic field interference between the modules and between the chips is blocked in a physical isolation mode, so that the problem of electromagnetic compatibility between the modules and between the chips is solved. However, as the internal space of the electronic device is further reduced and the internal modules and chips of the electronic device are further increased, the electromagnetic compatibility problem inside the electronic device cannot be comprehensively solved by singly adopting the conductive shielding case. Therefore, the wave-absorbing film is pasted in the electronic equipment to relieve the electromagnetic interference problem in the equipment, and the method is another universal means for designing the high-integration electronic equipment at present.
However, in the present stage, the single mean wave absorbing film often has the problems that the wave absorbing frequency band is narrow, and high and low frequencies cannot be considered at the same time. The problem is solved by increasing a plurality of layers of wave-absorbing films or improving the thickness of the wave-absorbing films, but the utilization rate of the internal space of the equipment is reduced by the method, and the high-density integration of the equipment is not facilitated.
Disclosure of Invention
The invention aims to provide a multiband magnetic wave-absorbing film and a preparation method thereof, and aims to solve the problem that the utilization rate of the internal space of electronic equipment is reduced by adding a plurality of layers of wave-absorbing films or increasing the thickness of the wave-absorbing films.
In order to realize the purpose of the invention, the technical scheme is as follows: a multi-band magnetic wave-absorbing film comprises a base film and magnetic absorbent slurry coated on the surface of the base film; the magnetic absorbent slurry comprises a magnetic absorbent, a liquid high molecular polymer and an auxiliary agent; the magnetic absorbent comprises one or more of flaky iron-based metal powder, flaky iron-based alloy powder, flaky iron-silicon-aluminum alloy powder, flaky iron-silicon-chromium alloy powder, flaky cobalt-based alloy powder and flaky iron-nickel alloy powder; the liquid high molecular polymer comprises one or more of polyurethane resin, silicone resin, acrylic resin, epoxy resin, polyimide and ethylene-vinyl acetate copolymer; the auxiliary agent comprises one or more of a dispersing agent, a flatting agent, a wetting agent, a thickening agent and a defoaming agent.
As a further alternative, in the magnetic absorbent slurry, the solid content of the liquid high molecular polymer is 5 to 20 parts by weight relative to 100 parts by weight of the magnetic absorbent.
As a further alternative, in the magnetic absorbent slurry, with respect to 100 parts by weight of the magnetic absorbent: the solid content of the dispersing agent is 0.1-7 parts by weight, and/or the solid content of the flatting agent is 0.1-3 parts by weight, and/or the solid content of the wetting agent is 0.1-5 parts by weight, and/or the solid content of the thickening agent is 0.1-20 parts by weight, and/or the solid content of the defoaming agent is 0.1-8 parts by weight.
The invention also provides a preparation method of the multiband magnetic wave-absorbing film, which is characterized by comprising the following steps:
s1, preparing magnetic absorbent slurry;
s2, preparing a magnetic film: carrying out film preparation on the surface of the base film by coating the prepared magnetic absorbent slurry to prepare a magnetic film;
s3, periodic modulation of the magnetic film: before the magnetic film is not dried, the prepared magnetic film is subjected to periodic modulation through a strip-shaped magnetic field which is periodically arranged; the magnetic film passes through the strip-shaped magnetic field which is arranged in parallel or in a crossed way in a single period or multiple periods, and the strip-shaped magnetic field forms interference fringes which are arranged in parallel or in a crossed way in a single period or multiple periods on the magnetic film;
s4, drying the magnetic film: drying the magnetic film subjected to periodic modulation;
s5, forming of a magnetic film: and sequentially carrying out hot pressing and cold pressing on the dried magnetic film.
As a further alternative, in step S3, the interval between the periodically arranged strip-shaped magnetic fields is 0.5mm to 100 mm.
As a further alternative, in the step S2, the thickness of the prepared magnetic film is 0.02 mm-0.5 mm.
As a further alternative, in step S5, the dried magnetic film is introduced into a hot roller rolling mechanism, which is a two-roller or multi-roller rolling mechanism; after heating and rolling, the magnetic film is guided into a cold roll rolling mechanism which is a double-roll or multi-roll rolling mechanism.
As a further alternative, the temperature range of the hot roller rolling mechanism is 50-280 ℃, and the temperature range of the cold roller rolling mechanism is 10-20 ℃.
As a further alternative, the magnetic thin film introduced into the hot roll rolling mechanism and the cold roll rolling mechanism is a single-layer magnetic thin film or a stack of multiple layers of magnetic thin films.
As a further alternative, in step S4, the drying is performed by a multi-temperature-zone drying tunnel, where the drying temperature of the multi-temperature-zone drying tunnel is from low to high, and the temperature range is 40 ℃ to 180 ℃.
The invention has the beneficial effects that: 1. the magnetic wave-absorbing film and the preparation method can realize continuous film preparation; 2. the occupied space is small, multi-band expansion is realized through magnetic field fringe interference, and the thickness of the film is not increased; 3. the process is simple, and the used equipment and the process are both traditional film production equipment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The invention will be further illustrated with reference to specific examples.
The multi-band magnetic wave-absorbing film provided by the embodiment of the invention comprises a base film and magnetic absorbent slurry coated on the surface of the base film; the magnetic absorbent slurry comprises a magnetic absorbent, a liquid high molecular polymer and an auxiliary agent; the magnetic absorbent comprises one or more of flaky iron-based metal powder, flaky iron-based alloy powder, flaky iron-silicon-aluminum alloy powder, flaky iron-silicon-chromium alloy powder, flaky cobalt-based alloy powder and flaky iron-nickel alloy powder; the liquid high molecular polymer comprises one or more of polyurethane resin, silicone resin, acrylic resin, epoxy resin, polyimide and ethylene-vinyl acetate copolymer; the auxiliary agent comprises one or more of a dispersing agent, a flatting agent, a wetting agent, a thickening agent and a defoaming agent.
The magnetic absorbent has a sheet thickness of 0.3 to 2 μm and a radial width of 4 to 200 μm.
In the magnetic absorbent slurry, the solid content of the liquid high molecular polymer is 5 to 20 parts by weight relative to 100 parts by weight of the magnetic absorbent.
In the magnetic absorbent slurry, with respect to 100 parts by weight of the magnetic absorbent: the solid content of the dispersing agent is 0.1-7 parts by weight, and/or the solid content of the flatting agent is 0.1-3 parts by weight, and/or the solid content of the wetting agent is 0.1-5 parts by weight, and/or the solid content of the thickening agent is 0.1-20 parts by weight, and/or the solid content of the defoaming agent is 0.1-8 parts by weight; the auxiliary agent comprises one or more of the above.
The embodiment of the invention also provides a preparation method of the multiband magnetic wave-absorbing film, which comprises the following steps:
s1, preparing magnetic absorbent slurry;
s2, preparing a magnetic film: carrying out film preparation on the surface of the base film by coating the prepared magnetic absorbent slurry to prepare a magnetic film;
s3, periodic modulation of the magnetic film: before the magnetic film is not dried, the prepared magnetic film is subjected to periodic modulation through a strip-shaped magnetic field which is periodically arranged; the magnetic film passes through the strip-shaped magnetic field which is arranged in parallel or in a crossed way in a single period or multiple periods, and the strip-shaped magnetic field forms interference fringes which are arranged in parallel or in a crossed way in a single period or multiple periods on the magnetic film;
s4, drying the magnetic film: drying the magnetic film subjected to periodic modulation;
s5, forming of a magnetic film: and sequentially carrying out hot pressing and cold pressing on the dried magnetic film. After the pressing forming, the edge cutting and winding can be carried out.
Through the periodic modulation of the magnetic wave-absorbing film, the magnetic wave-absorbing film has a multi-band absorption effect, and a broadband electromagnetic interference suppression effect is realized under the condition of unchanged thickness.
The coating mode is one or more of blade casting coating, lip extrusion coating, transfer coating and base film immersion coating.
In step S3, the interval between the periodically arranged strip magnetic fields may be 0.5mm to 100 mm. In step S2, the thickness of the prepared magnetic film is 0.02 mm-0.5 mm.
In step S4, the drying is multi-temperature zone drying tunnel drying, the drying temperature of the multi-temperature zone drying tunnel is from low to high, and the temperature range is 40-180 ℃. Each temperature zone can be baked for 30 min.
In step S5, the dried magnetic film is introduced into a hot roller rolling mechanism, which is a double-roller or multi-roller sheeting rolling mechanism; after heating and rolling, the magnetic film is guided into a cold roll rolling mechanism which is a double-roll or multi-roll rolling mechanism. Wherein the temperature range of the hot roller rolling mechanism can be 50-280 ℃, and the temperature range of the cold roller rolling mechanism can be 10-20 ℃. The magnetic film introduced into the hot roller rolling mechanism and the cold roller rolling mechanism is a single-layer magnetic film or a superposition of multiple layers of magnetic films.
Example 1
In the magnetic absorbent slurry of the multiband magnetic wave-absorbing film, relative to 100 parts by weight of a magnetic absorbent, the solid content of a liquid high-molecular polymer is 12.5 parts by weight, the solid content of a dispersing agent is 0.35 part by weight, the solid content of a flatting agent is 1.5 parts by weight, the solid content of a wetting agent is 2.5 parts by weight, the weight of a thickening agent is 10 parts by weight, and the weight of a defoaming agent is 4 parts by weight.
The preparation method comprises the following steps of taking 400 parts by weight of flaky iron-silicon alloy powder with the thickness of 1 mu m and the sheet diameter of 100 mu m, 100 parts by weight of acrylic resin emulsion with the solid content of 50%, 20 parts by weight of dispersing agent with the solid content of 70%, 30 parts by weight of leveling agent with the solid content of 20%, 20 parts by weight of wetting agent with the solid content of 50%, 40 parts by weight of thickening agent and 16 parts by weight of defoaming agent. Adding into a high-speed dispersion machine together for dispersion, taking out after 1 hour of dispersion, and standing. Standing for 1 hour, and defoaming in a vacuum defoaming machine. And defoaming to obtain the magnetic absorbent slurry.
The prepared magnetic absorbent slurry is put into a casting box of a casting machine, the height of a scraper of the casting machine is adjusted to be 0.4mm, and the casting speed is 3 m/min. And preparing the magnetic film by a doctor blade casting coating mode.
A periodic strip magnetic field is arranged at a position 10cm away from a discharge port of a scraper of the casting machine, the strip magnetic field can be a permanent magnet or an electromagnet, and the distance between the strip magnetic fields is 50 mm. The cast film is subjected to periodic magnetic field modulation by a magnetic field.
And (4) drying the modulated magnetic film in an oven. The oven is set with multiple temperature zones, the first temperature zone is set with 60 ℃, the second temperature zone is set with 80 ℃, the third temperature zone is set with 100 ℃, and the fourth temperature zone is set with 120 ℃. Each temperature zone was baked for 30 minutes.
The dried magnetic film was introduced into a twin-roll hot roll press mechanism, set at 130 ℃ and set at an inter-roll gap of 0.15 mm.
After rolling with a hot roll, the magnetic film was introduced into a two-roll cold roll rolling mechanism, set at 15 ℃ and the gap between the rolls was set at 0.1 mm.
And (4) cutting edges and winding the finished film to prepare the magnetic wave-absorbing film.
Example 2
In the magnetic absorbent slurry of the multiband magnetic wave-absorbing film, relative to 100 parts by weight of a magnetic absorbent, the solid content of a liquid high-molecular polymer is 5 parts by weight, the solid content of a dispersing agent is 0.1 part by weight, the solid content of a flatting agent is 0.1 part by weight, the solid content of a wetting agent is 0.1 part by weight, the weight of a thickening agent is 0.1 part by weight, and the weight of a defoaming agent is 0.1 part by weight.
The preparation method comprises the following steps of taking 1000 parts by weight of sheet-shaped iron-silicon alloy powder with the thickness of 0.3 mu m and the sheet diameter of 4 mu m, 100 parts by weight of acrylic resin emulsion with the solid content of 50%, 2 parts by weight of dispersing agent with the solid content of 50%, 5 parts by weight of flatting agent with the solid content of 20%, 2 parts by weight of wetting agent with the solid content of 50%, 1 part by weight of thickening agent and 1 part by weight of defoaming agent. Adding into a high-speed dispersion machine together for dispersion, taking out after 1 hour of dispersion, and standing. Standing for 1 hour, and defoaming in a vacuum defoaming machine. And defoaming to obtain the magnetic absorbent slurry.
In comparison with example 1, the oven was set to 40 ℃ in the first temperature zone, 60 ℃ in the second temperature zone, 80 ℃ in the third temperature zone and 100 ℃ in the fourth temperature zone. Each temperature zone was baked for 30 minutes. The set temperature of the hot roller rolling mechanism is 50 ℃, and the set temperature of the cold roller rolling mechanism is 10 ℃.
Example 3
In the magnetic absorbent slurry of the multiband magnetic wave-absorbing film, relative to 100 parts by weight of a magnetic absorbent, the solid content of a liquid high-molecular polymer is 20 parts by weight, the solid content of a dispersing agent is 7 parts by weight, the solid content of a flatting agent is 3 parts by weight, the solid content of a wetting agent is 5 parts by weight, the solid content of a thickening agent is 20 parts by weight, and the weight of a defoaming agent is 8 parts by weight.
The preparation method comprises the following steps of taking 200 parts by weight of sheet-shaped iron-silicon alloy powder with the thickness of 2 mu m and the sheet diameter of 200 mu m, 80 parts by weight of acrylic resin emulsion with the solid content of 50%, 20 parts by weight of dispersing agent with the solid content of 70%, 30 parts by weight of flatting agent with the solid content of 20%, 20 parts by weight of wetting agent with the solid content of 50%, 40 parts by weight of thickening agent and 16 parts by weight of defoaming agent. Adding into a high-speed dispersion machine together for dispersion, taking out after 1 hour of dispersion, and standing. Standing for 1 hour, and defoaming in a vacuum defoaming machine. And defoaming to obtain the magnetic absorbent slurry.
In comparison with example 1, the oven was set to a first temperature zone of 90 ℃, a second temperature zone of 120 ℃, a third temperature zone of 150 ℃ and a fourth temperature zone of 180 ℃. Each temperature zone was baked for 30 minutes. The set temperature of the hot roller rolling mechanism is 50 ℃, and the set temperature of the cold roller rolling mechanism is 10 ℃.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (10)
1. A multi-band magnetic wave-absorbing film is characterized by comprising a base film and magnetic absorbent slurry coated on the surface of the base film; the magnetic absorbent slurry comprises a magnetic absorbent, a liquid high molecular polymer and an auxiliary agent; the magnetic absorbent comprises one or more of flaky iron-based metal powder, flaky iron-based alloy powder, flaky iron-silicon-aluminum alloy powder, flaky iron-silicon-chromium alloy powder, flaky cobalt-based alloy powder and flaky iron-nickel alloy powder; the liquid high molecular polymer comprises one or more of polyurethane resin, silicone resin, acrylic resin, epoxy resin, polyimide and ethylene-vinyl acetate copolymer; the auxiliary agent comprises one or more of a dispersing agent, a flatting agent, a wetting agent, a thickening agent and a defoaming agent.
2. The multiband magnetic wave absorbing film according to claim 1, wherein the solid content of the liquid high molecular polymer in the magnetic absorbent slurry is 5 to 20 parts by weight with respect to 100 parts by weight of the magnetic absorbent.
3. The multiband magnetic wave absorbing film according to claim 1, wherein in said magnetic absorbent slurry, with respect to 100 parts by weight of the magnetic absorbent: the solid content of the dispersing agent is 0.1-7 parts by weight, and/or the solid content of the flatting agent is 0.1-3 parts by weight, and/or the solid content of the wetting agent is 0.1-5 parts by weight, and/or the solid content of the thickening agent is 0.1-20 parts by weight, and/or the solid content of the defoaming agent is 0.1-8 parts by weight.
4. A method for preparing a multiband magnetic wave absorbing film according to any one of claims 1 to 3, comprising the steps of:
s1, preparing magnetic absorbent slurry;
s2, preparing a magnetic film: carrying out film preparation on the surface of the base film by coating the prepared magnetic absorbent slurry to prepare a magnetic film;
s3, periodic modulation of the magnetic film: before the magnetic film is not dried, the prepared magnetic film is subjected to periodic modulation through a strip-shaped magnetic field which is periodically arranged; the magnetic film passes through the strip-shaped magnetic field which is arranged in parallel or in a crossed way in a single period or multiple periods, and the strip-shaped magnetic field forms interference fringes which are arranged in parallel or in a crossed way in a single period or multiple periods on the magnetic film;
s4, drying the magnetic film: drying the magnetic film subjected to periodic modulation;
s5, forming of a magnetic film: and sequentially carrying out hot pressing and cold pressing on the dried magnetic film.
5. The method for preparing a multiband magnetic wave-absorbing film according to claim 4, wherein in step S3, the interval between the periodically arranged strip-shaped magnetic fields is 0.5mm to 100 mm.
6. The method for preparing a multiband magnetic wave-absorbing film according to claim 4, wherein in the step S2, the thickness of the prepared magnetic film is 0.02mm to 0.5 mm.
7. The method for preparing a multiband magnetic wave absorbing film according to claim 4, wherein in step S5, the dried magnetic film is introduced into a hot roller rolling mechanism, the hot roller rolling mechanism is a double-roller or multi-roller sheeting rolling mechanism; after heating and rolling, the magnetic film is guided into a cold roll rolling mechanism which is a double-roll or multi-roll rolling mechanism.
8. The method for preparing the multiband magnetic wave absorbing film according to claim 7, wherein the temperature range of the hot roller rolling mechanism is 50 ℃ to 280 ℃, and the temperature range of the cold roller rolling mechanism is 10 ℃ to 20 ℃.
9. The method for preparing a multiband magnetic wave absorbing film according to claim 7, wherein the magnetic films introduced into the hot roll rolling mechanism and the cold roll rolling mechanism are a single layer magnetic film or a stack of multiple layers of magnetic films.
10. The method for preparing the multiband magnetic wave absorbing film according to claim 4, wherein the drying in step S4 is a drying tunnel with multiple temperature zones, the drying temperature of the drying tunnel with multiple temperature zones is from low to high, and the temperature range is 40 ℃ to 180 ℃.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113861660A (en) * | 2021-09-24 | 2021-12-31 | 成都佳驰电子科技股份有限公司 | High-temperature-resistant magnetic wave-absorbing film and preparation method thereof |
| CN114163820A (en) * | 2021-12-17 | 2022-03-11 | 成都佳驰电子科技股份有限公司 | Bi-component addition type silica gel wave-absorbing film and preparation method thereof |
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