CN110484112B - Electromagnetic wave interference inhibiting paint and method for preparing electromagnetic wave interference inhibiting coating - Google Patents

Electromagnetic wave interference inhibiting paint and method for preparing electromagnetic wave interference inhibiting coating Download PDF

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Publication number
CN110484112B
CN110484112B CN201811566637.1A CN201811566637A CN110484112B CN 110484112 B CN110484112 B CN 110484112B CN 201811566637 A CN201811566637 A CN 201811566637A CN 110484112 B CN110484112 B CN 110484112B
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coating
electromagnetic wave
wave interference
weight
curing
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CN110484112A (en
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许嘉颂
胡庆江
田城华
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Zhejiang Yuanbang Material Technology Co ltd
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Zhejiang Yuanbang Material Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/32—Radiation-absorbing paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K2003/023—Silicon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/0812—Aluminium
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/0856—Iron

Abstract

The invention discloses an electromagnetic wave interference suppression coating, which comprises soft magnetic powder, thermoplastic polyurethane, an organic curing agent, an organic solvent and a surfactant; the invention also provides a preparation method of the electromagnetic wave interference suppression coating, which comprises the steps of coating the coating on a continuously rotating polymer film support to form a coating, and simultaneously carrying out rotating magnetic field orientation treatment on the coating; and peeling the formed coating from the polymer film support, and curing at least one layer of the formed coating. The electromagnetic wave interference suppression coating prepared by the invention has strong electromagnetic wave absorbability and excellent mechanical strength and processability.

Description

Electromagnetic wave interference inhibiting paint and method for preparing electromagnetic wave interference inhibiting coating
Technical Field
The invention relates to the technical field of electronic component materials, in particular to an electromagnetic wave interference suppression coating and a preparation method of a high-permeability electromagnetic wave interference suppression coating capable of effectively suppressing the electromagnetic interference problem in a high-frequency electronic circuit/device.
Background
With the popularization of electronic devices such as mobile phones, personal computers, tablet computers and the like, the mutual interference, misoperation or information theft of electromagnetic waves become a technical problem and a social problem. Conventionally, as a measure for suppressing such electromagnetic interference, a soft magnetic material having a high magnetic permeability is generally used as an electromagnetic wave absorber. After the soft magnetic material absorbs the electromagnetic waves, the energy of the electromagnetic waves can be converted into heat through spin reversal or magnetic wall movement, so that the intensity of the transmitted or reflected electromagnetic waves is reduced.
The electromagnetic interference suppressing coating layer is generally prepared by a kneading and rolling method. In this method, a single-layer electromagnetic interference suppression coating layer is obtained by kneading flat soft magnetic powder with a binder such as rubber and chlorinated polyethylene at a predetermined ratio in a kneader, calendering the resultant kneaded product in a device such as a roll to a predetermined thickness, and heating and crosslinking the binder as necessary. This method has advantages that the soft magnetic powder can be filled at high density, the soft magnetic powder can be oriented in the in-plane direction by rolling, and the sheet thickness can be easily adjusted. However, in the kneading and rolling method, strain is generated in the soft magnetic powder during kneading, and it is difficult to fill the electromagnetic interference suppression coating layer with the soft magnetic powder at a high density, so that the magnetic properties of the soft magnetic powder itself are lowered, and there is a problem that the magnetic permeability of the electromagnetic interference suppression coating layer cannot be increased. Further, the thickness of the sheet changes in a direction of increasing the thickness under a high-temperature or high-temperature and high-humidity environment, and the permeability is lowered. Further, with the miniaturization and thinning of electronic devices, there is a demand for electromagnetic interference suppression coatings that are thinner and lighter and have excellent electromagnetic wave absorption performance.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method for preparing an electromagnetic interference suppressing coating layer having high magnetic permeability, which is not only strong in electromagnetic wave absorbability but also excellent in mechanical strength, workability, lightness, thinness, softness, and shape retentivity.
In order to solve the technical problems, the invention provides an electromagnetic wave interference suppression coating, which comprises 29-59% of soft magnetic powder, 5-9% of thermoplastic polyurethane, 0.5-1.6% of organic curing agent and 35-62% of organic solvent by weight percent.
The soft magnetic powder of the present invention includes at least one of Fe-Si-Al alloy, Fe-Cr-Al-Si alloy, Fe-Ni alloy, Fe-Cu-Si alloy, Fe-Si-B (-Cu-Nb) alloy, Fe-Si-Cr-Ni alloy, Fe-Si-Cr alloy, Fe-Si-Al-Ni-Cr alloy, and ferrite. A preferable embodiment is Fe-Si-Al alloy powder as the soft magnetic powder. The Fe-Si-Al alloy powder preferably has an average particle diameter of 0.5 to 100 μm and an average thickness of 0.1 to 3.0. mu.m, and more preferably has an average particle diameter of 10 to 100 μm and an average thickness of 0.5 to 2.5. mu.m. In order to increase the permeability of the electromagnetic interference suppression coating layer, it is effective to increase the particle size of the soft magnetic powder, reduce the interval between particles, and increase the aspect ratio of the soft magnetic powder to reduce the influence of demagnetization in the soft magnetic powder.
The molecular weight of the thermoplastic polyurethane of the invention is 10000-1000000 g/mol. A preferred embodiment is where the molecular weight of the thermoplastic polyurethane is 300000-7000000 g/mol. The thermoplastic polyurethane functions to bind the soft magnetic powder.
The organic curing agent of the present invention includes at least one of 1, 3-bis (t-butylperoxyisopropyl) benzene, N' -m-phenylene bismaleimide, triallyl isocyanurate, isocyanate compounds, dicumyl peroxide, diacyl peroxide, t-alkyl peroxyester, alkyl hydroperoxide, dialkyl peroxide, and dialkyl peroxyketal. A preferred embodiment is 1, 3-bis (tert-butylperoxyisopropyl) benzene and N, N' -m-phenylene bismaleimide as thermoplastic polyurethane. The organic curing agent undergoes a cross-coupling reaction with the thermoplastic polyurethane during the heating and pressure molding process, and is cured mainly in the vicinity of the surface of the electromagnetic interference suppression coating layer, thereby preventing the soft magnetic powder and the thermoplastic polyurethane from falling off from the electromagnetic interference suppression coating layer. The thermoplastic polyurethane component is insufficient, and the thickness unevenness is generated on the coated surface, the hot workability is deteriorated, and the streaks are generated at the time of coating. In addition, if the amount of the thermoplastic polyurethane is relatively large relative to the amount of the organic curing agent, the electromagnetic wave interference suppression coating layer becomes soft; if the amount of the organic curing agent is relatively increased, the electromagnetic wave interference suppression coating layer becomes hard. Therefore, when the thermoplastic polyurethane is contained in the paint in an amount of 5 to 9% by weight and the organic curing agent is contained in an amount of 0.5 to 1.6% by weight, and the organic curing agent is used in a relatively large amount, the electromagnetic interference suppressing coating layer with high reliability can be obtained.
The organic solvent comprises at least one of cyclohexanone, tetrahydrofuran, acetone, methyl ethyl ketone, methyl isobutyl ketone, toluene, xylene, benzene, ethyl acetate, n-butyl acetate and dioxane. Preferred embodiments are cyclohexanone and/or toluene as organic solvent.
The coating also comprises 0.2 to 3 weight percent of surfactant.
The surfactant of the coating is selected from at least one of di (2-ethylhexyl) phthalate, graphite, molybdenum disulfide, tungsten disulfide, lecithin, fatty acid with carbon number of 2-26, fatty acid ester formed by the fatty acid and alcohol with carbon number of 2-26, terpene compounds, oligomer of the terpene compounds, silicone oil and dioctyl adipate. The surfactant can promote the high uniform dispersion of the soft magnetic powder in the slurry, reduce bubbles generated in the electromagnetic interference suppression coating and ensure the smoothness and the flatness of the surface of the electromagnetic interference suppression coating.
The thermoplastic polyurethane of the invention is dissolved by an organic solvent to prepare a solution with the solid content of 30 percent for storage and standby. In a preferred scheme, cyclohexanone is used as an organic solvent to dissolve the thermoplastic polyurethane to prepare a solution with the solid content of 30% for storage and standby.
The invention also provides a preparation method of the electromagnetic wave interference suppression coating, which sequentially comprises the following steps:
(1) coating any one of the electromagnetic interference suppression coatings on a continuously rotating polymer film support to form a coating, performing orientation treatment on the coating by a rotating magnetic field, and then drying at 85-155 ℃, wherein the thickness of the formed coating is 0.06-0.2 mm;
(2) and (3) post-treatment: stripping the formed coating from the polymer film support, and curing at least one layer of the formed coating at a curing temperature of 170-200 ℃ and a curing pressure of 6-8.5MPa to obtain the electromagnetic wave interference suppression coating.
In step 1 of the method for preparing an electromagnetic interference suppression coating by coating according to the present invention, a coating method for forming an electromagnetic interference suppression coating on a polymer film support is not particularly limited, and conventional methods such as air knife coating, blade coating, wire bar coating, air knife coating, extrusion coating, dip coating, reverse roll coating, transfer roll coating, gravure coating, kiss coating, cast coating, extrusion coating, slit coating, spin coating, and the like can be used. By using the coating apparatus of these methods, a polymer film support can be coated on one side or both sides. The polymer membrane support may be other polymer thin films such as polyethylene terephthalate (PET), Polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polypropylene (PP), polyamide, polyether, and polyether sulfone.
In the step 1 of the method for preparing the electromagnetic wave interference suppression coating by coating, the coating is subjected to rotating magnetic field orientation treatment. In the coating process, due to the influence of shape anisotropy, the magnetic moments of the soft magnetic powder tend to be arranged in the sheet, so that after an external magnetic field is applied to the soft magnetic powder in disordered distribution, a torque is generated to act on the soft magnetic powder due to the deviation of the magnetization direction from the easy magnetization surface, so that the easy magnetization surface tends to be arranged along the magnetic field direction. Since the thermoplastic polyurethane adhesive is in a liquid or gel state at this time, the friction force of the soft magnetic powder when it rotates is greatly reduced. After such an orientation process has continued for more than 1 minute, the movement of the soft magnetic powder reaches a certain equilibrium, and the thermoplastic polyurethane gradually solidifies, holding the soft magnetic powder in a specific orientation. The soft magnetic powder with the specific orientation enables the electromagnetic wave interference suppression coating to have a high absorption coefficient for electromagnetic waves in the specific orientation, and is beneficial to being widely applied to electronic equipment generating electromagnetic interference with the specific orientation.
In the step 1 of the method for preparing the electromagnetic interference suppression coating by coating, the drying treatment is a gradient sectional heating process. The gradient sectional heating treatment avoids the phenomenon that the coating generates bubbles and cracks due to the fact that the solvent is volatilized too fast because the coating is heated too fast.
In the step 1 of the method for preparing the electromagnetic wave interference suppression coating by coating, the coating speed ranges from 2m/min to 4.2 m/min. The coating treatment is carried out in the speed range of 2-4.2m/min, and the electromagnetic wave interference suppression coating with continuous and uniform thickness and high filling degree of the soft magnetic powder can be obtained, so that the coating has higher magnetic permeability.
In step 2 of the method for preparing the electromagnetic interference suppression coating by coating, the curing speed ranges from 0.3m/min to 2.5 m/min. The curing treatment is carried out within the curing speed range of 0.3-2.5m/min, which is beneficial to obtaining the electromagnetic wave interference suppression coating with high curing degree, uniform thickness, high toughness and high filling degree of the soft magnetic powder, thereby having higher magnetic permeability.
The electromagnetic wave interference suppression coating has insufficient compression when the tensile strength is too low, the soft magnetic powder cannot be tightly packed, air is possibly mixed in the coating, and the thickness change is increased; conversely, when the tensile strength is too high, the coating layer is excessively compressed and the flexibility of the coating layer is lowered, and therefore, it is preferably 20MPa or more and 50MPa or less, more preferably 25MPa or more and 45MPa or less. When the tensile strength is within this range, the sheet itself has hardness, and excellent workability and workability, while having appropriate flexibility, and the yield when the electromagnetic interference suppression coating layer is incorporated into an electronic device or the like is not reduced. The method of setting the tensile strength of the coating layer in this preferred range can be performed by adjusting the curing pressure, the curing process speed, or the amount of the soft magnetic powder used.
The invention has the beneficial effects that: the present invention provides an electromagnetic interference suppression coating material and a method for preparing an electromagnetic interference suppression coating layer with high magnetic permeability by coating, which combines the advantages of a coating method, and the electromagnetic interference suppression coating layer prepared by the coating method not only has strong electromagnetic wave absorbability, but also has excellent mechanical strength, processability, lightness, thinness, softness and shape retentivity.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.
Example 1
98 parts by weight of thermoplastic polyurethane (manufactured by Sigma-Aldrich, average molecular weight: 40 ten thousand) was dissolved with 170 parts by weight of toluene and 130 parts by weight of cyclohexanone as organic solvents to prepare a glue, and 500 parts by weight of Fe-Si-Al alloy soft magnetic powder (specific surface area: 0.23 m)2G, anisotropic magnetic field 135Oe, resonance frequency fr ″: 2000MHz) was dispersed in the glue, followed by addition of 200 parts by weight of cyclohexanone and 10 parts by weight of organic curing agent 1, 3-bis (t-butylperoxyisopropyl), 12 parts by weight of surfactant di (2-ethylhexyl) phthalate, to make a uniform coating.
Adjusting the temperature of the coating to 25 ℃, coating the coating at a coating speed of 2m/min and spreading the coating on a continuously rotating PET high polymer film support to form a coating, simultaneously carrying out orientation treatment on the coating by a rotating magnetic field, then carrying out drying treatment at 85-155 ℃, drying the coating by a three-stage oven at 90 ℃, 110 ℃ and 130 ℃, then drying by a fourth-stage oven, a fifth-stage oven and a sixth-stage oven at 135 ℃, 140 ℃ and 145 ℃, and finally drying by a seventh-stage oven at 150 ℃, so as to obtain the coating with the thickness of about 0.1mm after drying.
And peeling the formed coating from the PET high polymer film support. 4 pieces of the peeled coating layers were prepared and laminated, and both surfaces of the laminated layer were sandwiched by peelable PET, and further, a paper material having a thickness of 100 μm was disposed as a buffer material on both surfaces, and both sides were sandwiched by two stainless steel plates, and the laminate was cured by a drum vulcanizer at a pressure of 6MPa and a curing speed of 2m/min at 175 ℃ to obtain an electromagnetic interference suppressing coating layer.
The obtained emi suppression coating was subjected to a heat resistance test (left to stand in an oven at a temperature of 80 ℃ and a humidity of 60 Rh% for 72 hours), and the thickness of the emi suppression coating after the heat resistance test was changed in the direction of decreasing thickness, but the rate of change was less than 1% based on the emi suppression coating before the heat resistance test. The effective permeability mu 'value is above 50 and the magnetic loss mu' is lower than 2. The effective permeability μ' is obtained by measuring the inductance and resistance value at a carrier frequency (13.4MHz) using an impedance analyzer (provided by Agilent Technology) and calculating the permeability.
The gloss of the obtained electromagnetic interference suppressing coating layer at an incident angle of 60 ° (-60 °) was measured to be 31% using a gloss meter. The gloss is preferably in the range of 20 to 50%.
The tensile strength of a sample 0.25mm thick, 50mm wide and 100mm long was measured to be 32MPa using a tensile tester. The tensile strength is preferably in the range of 20 to 50 MPa.
Using a wear tester at 50N/m2The sample of the electromagnetic wave interference suppression coating is worn for 30mins under pressure, the abrasion loss is less than 5%, the obtained coating is not observed to fall off, and the soft magnetic powder does not fall off when the coating is touched.
The prepared electromagnetic wave interference suppression coating shows good results in magnetic permeability, glossiness, tensile strength, electric resistance, flexibility and shape retentivity.
Example 2
88 parts by weight of thermoplastic polyurethane (manufactured by Sigma-Aldrich, average molecular weight: 40 ten thousand) was dissolved with 100 parts by weight of toluene and 170 parts by weight of cyclohexanone as organic solvents to prepare a glue, and 500 parts by weight of Fe-Si-Al alloy soft magnetic powder (specific surface area: 0.27 m)2G, anisotropic magnetic field 115Oe, resonance frequency fr ″: 2000MHz) was dispersed in the glue, and then 500 parts by weight of cyclohexanone, 4 parts by weight of organic curing agent 1, 3-bis (t-butylperoxyisopropyl) benzene, 4 parts by weight of N, N' -m-phenylene bismaleimide, 5 parts by weight of surfactant di (2-ethylhexyl) phthalate were added to make a uniform coating.
Adjusting the temperature of the coating to 25 ℃, coating the coating at a coating speed of 2m/min and spreading the coating on a continuously rotating PET high polymer film support to form a coating, simultaneously carrying out orientation treatment on the coating by a rotating magnetic field, then carrying out drying treatment at 85-155 ℃, drying the coating by a three-stage oven at 90 ℃, 110 ℃ and 130 ℃, then drying by a fourth-stage oven, a fifth-stage oven and a sixth-stage oven at 135 ℃, 140 ℃ and 145 ℃, and finally drying by a seventh-stage oven at 150 ℃, so as to obtain the coating with the thickness of about 0.1mm after drying.
And peeling the formed coating from the PET high polymer film support. 2 pieces of peeled coating layers were prepared and laminated, and both surfaces of the laminate were sandwiched by peelable PET, and further, a paper material having a thickness of 100 μm was disposed as a buffer material on both surfaces, and both sides were sandwiched by two stainless steel plates, and cured by a drum vulcanizer at a pressure of 6MPa and a curing speed of 2m/min at 175 ℃ to obtain an electromagnetic interference suppressing coating layer.
The obtained emi suppression coating was subjected to a heat resistance test (left to stand in an oven at a temperature of 80 ℃ and a humidity of 60 Rh% for 72 hours), and the thickness of the emi suppression coating after the heat resistance test was changed in the direction of decreasing thickness, but the rate of change was less than 1% based on the emi suppression coating before the heat resistance test. The effective permeability mu 'value is above 60 and the magnetic loss mu' is below 3. The effective permeability μ' is obtained by measuring the inductance and resistance value at a carrier frequency (13.4MHz) using an impedance analyzer (provided by Agilent Technology) and calculating the permeability.
The gloss of the obtained electromagnetic interference suppressing coating layer was measured to be 29% at an incident angle of 60 ° (-60 °) using a gloss meter. The gloss is preferably in the range of 20 to 50%.
The tensile strength of a sample 0.16mm thick, 50mm wide and 100mm long was measured to be 28MPa using a tensile tester. The tensile strength is preferably in the range of 20 to 50 MPa.
Using a wear tester at 50N/m2The sample of the electromagnetic wave interference suppression coating is worn for 30mins under pressure, the abrasion loss is less than 5%, the obtained coating is not observed to fall off, and the soft magnetic powder does not fall off when the coating is touched.
The prepared electromagnetic interference suppression coating layer showed better results in permeability, glossiness, tensile strength, electric resistance, flexibility, and shape retention than those of example 1.
Example 3
80 parts by weight of thermoplastic polyurethane (manufactured by Sigma-Aldrich, average molecular weight: 40 ten thousand) was dissolved in 200 parts by weight of cyclohexanone as an organic solvent to prepare a glue, and 500 parts by weight of Fe-Si-Al alloy soft magnetic powder (specific surface area: 0.23 m)2G, anisotropic magnetic field 115Oe, resonance frequency fr ″: 2000MHz) was dispersed in the glue, followed by addition of 570 parts by weight of cyclohexanone, 4 parts by weight of 1, 3-bis (t-butylperoxyisopropyl) benzene as an organic curing agent, 4 parts by weight of N, N' -m-phenylene bismaleimide, and 6 parts by weight of di (2-ethylhexyl) phthalate as a surfactant to prepare a uniform coating.
Adjusting the temperature of the coating to 25 ℃, coating the coating at a coating speed of 2m/min and spreading the coating on a continuously rotating PET high polymer film support to form a coating, simultaneously carrying out orientation treatment on the coating by a rotating magnetic field, then carrying out drying treatment at 85-155 ℃, drying the coating by a three-stage oven at 90 ℃, 110 ℃ and 130 ℃, then drying by a fourth-stage oven, a fifth-stage oven and a sixth-stage oven at 135 ℃, 140 ℃ and 145 ℃, and finally drying by a seventh-stage oven at 150 ℃, so as to obtain the coating with the thickness of about 0.1mm after drying.
And peeling the formed coating from the PET high polymer film support. 2 pieces of peeled coating layers were prepared and laminated, and both surfaces of the laminate were sandwiched by peelable PET, and further, a paper material having a thickness of 100 μm was disposed as a buffer material on both surfaces, and both sides were sandwiched by two stainless steel plates, and cured by a drum vulcanizer at a pressure of 7MPa and a curing speed of 2m/min at 175 ℃ to obtain an electromagnetic interference suppressing coating layer.
The obtained emi suppression coating was subjected to a heat resistance test (left to stand in an oven at a temperature of 80 ℃ and a humidity of 60 Rh% for 72 hours), and the thickness of the emi suppression coating after the heat resistance test was changed in the direction of decreasing thickness, but the rate of change was less than 1% based on the emi suppression coating before the heat resistance test. The effective permeability mu 'value is above 60 and the magnetic loss mu' is below 1.5. The effective permeability μ' is obtained by measuring the inductance and resistance value at a carrier frequency (13.4MHz) using an impedance analyzer (provided by Agilent Technology) and calculating the permeability.
The gloss of the obtained electromagnetic interference suppressing coating layer was measured to be 32% at an incident angle of 60 ° (-60 °) using a gloss meter. The gloss is preferably in the range of 20 to 50%.
The tensile strength of a sample 0.16mm thick, 50mm wide and 100mm long was measured to be 28MPa using a tensile tester. The tensile strength is preferably in the range of 20 to 50 MPa.
Using a wear tester at 50N/m2The sample of the electromagnetic wave interference suppression coating is worn for 30mins under pressure, the abrasion loss is less than 5%, the obtained coating is not observed to fall off, and the soft magnetic powder does not fall off when the coating is touched.
The prepared electromagnetic wave interference suppression coating shows good results in magnetic permeability, glossiness, tensile strength, electric resistance, flexibility and shape retentivity.
Example 4
100 parts by weight of thermoplastic polyurethane (manufactured by Sigma-Aldrich, average molecular weight: 40 ten thousand) was dissolved in 270 parts by weight of cyclohexanone as an organic solvent to prepare a glue, and 500 parts by weight of Fe-Si-Al alloy soft magnetic powder (specific surface area: 0.23 m)2G, anisotropic magnetic field 115Oe, resonance frequency fr ″: 2000MHz) was dispersed in the glue, and then 500 parts by weight of cyclohexanone, 6 parts by weight of organic curing agent 1, 3-bis (t-butylperoxyisopropyl) benzene, 6 parts by weight of N, N' -m-phenylene bismaleimide, 12 parts by weight of surfactant di (2-ethylhexyl) phthalate were added to make a uniform coating.
Adjusting the temperature of the coating to 25 ℃, coating the coating at a coating speed of 2m/min and spreading the coating on a continuously rotating PET high polymer film support to form a coating, simultaneously carrying out orientation treatment on the coating by a rotating magnetic field, then carrying out drying treatment at 85-155 ℃, drying the coating by a three-stage oven at 90 ℃, 110 ℃ and 130 ℃, then drying by a fourth-stage oven, a fifth-stage oven and a sixth-stage oven at 135 ℃, 140 ℃ and 145 ℃, and finally drying by a seventh-stage oven at 150 ℃, so as to obtain the coating with the thickness of about 0.1mm after drying.
And peeling the formed coating from the PET high polymer film support. Preparing 1 piece of peeled coating, clamping two sides of the coating by using the peeled PET, further configuring paper materials with the thickness of 100 mu m on the two sides as buffer materials, clamping two sides by using two stainless steel plates, and curing by using a drum vulcanizer at the curing speed of 2m/min at the temperature of 175 ℃ under the pressure of 8Mpa to obtain the electromagnetic wave interference suppression coating.
The obtained emi suppression coating was subjected to a heat resistance test (left to stand in an oven at a temperature of 80 ℃ and a humidity of 60 Rh% for 72 hours), and the thickness of the emi suppression coating after the heat resistance test was changed in the direction of decreasing thickness, but the rate of change was less than 1% based on the emi suppression coating before the heat resistance test. The effective permeability mu 'value is above 60 and the magnetic loss mu' is below 1.5. The effective permeability μ' is obtained by measuring the inductance and resistance value at a carrier frequency (13.4MHz) using an impedance analyzer (provided by Agilent Technology) and calculating the permeability.
The gloss of the obtained electromagnetic interference suppressing coating layer was measured to be 32% at an incident angle of 60 ° (-60 °) using a gloss meter. The gloss is preferably in the range of 20 to 50%.
The tensile strength of a sample 0.08mm thick, 50mm wide and 100mm long was measured to be 22MPa using a tensile tester. The tensile strength is preferably in the range of 20 to 50 MPa.
Using a wear tester at 50N/m2The sample of the electromagnetic wave interference suppression coating is worn for 30mins under pressure, the abrasion loss is less than 5%, the obtained coating is not observed to fall off, and the soft magnetic powder does not fall off when the coating is touched.
The prepared electromagnetic wave interference suppression coating shows good results in magnetic permeability, glossiness, tensile strength, electric resistance, flexibility and shape retentivity.
Example 5
100 parts by weight of thermoplastic polyurethane (manufactured by Sigma-Aldrich, average molecular weight: 40 ten thousand) was dissolved in 270 parts by weight of cyclohexanone as an organic solvent to prepare a glue, and 500 parts by weight of Fe-Si-Al alloy soft magnetic powder (specific surface area: 0.23 m)2G, anisotropic magnetic field 115Oe, resonance frequency fr ″: 2000MHz) was dispersed in the glue, and then 500 parts by weight of cyclohexanone, 5 parts by weight of organic curing agent 1, 3-bis (t-butylperoxyisopropyl) benzene, 5 parts by weight of N, N' -m-phenylene bismaleimide, and 10 parts by weight of surfactant di (2-ethylhexyl) phthalate were added to prepare a uniform coating.
Adjusting the temperature of the coating to 25 ℃, coating the coating at a coating speed of 2m/min and spreading the coating on a continuously rotating PET high polymer film support to form a coating, simultaneously carrying out orientation treatment on the coating by a rotating magnetic field, drying the coating by a tertiary oven at 85 ℃, 95 ℃ and 105 ℃, then drying by a quaternary, a quinary and a quinary oven at 115 ℃, 120 ℃ and 130 ℃, and finally drying by a quinary oven at 140 ℃, thus obtaining the coating with the thickness of about 0.1mm after drying.
And peeling the formed coating from the PET high polymer film support. Preparing 1 piece of peeled coating, clamping two sides of the coating by using the peeled PET, further configuring paper materials with the thickness of 100 mu m on the two sides as buffer materials, clamping two sides by using two stainless steel plates, and curing by using a drum vulcanizer at the curing speed of 0.3m/min at the temperature of 175 ℃ under the pressure of 8.5Mpa to obtain the electromagnetic wave interference suppression coating.
The obtained emi suppression coating was subjected to a heat resistance test (left to stand in an oven at a temperature of 80 ℃ and a humidity of 60 Rh% for 72 hours), and the thickness of the emi suppression coating after the heat resistance test was changed in the direction of decreasing thickness, but the rate of change was less than 1% based on the emi suppression coating before the heat resistance test. The effective permeability mu 'value is above 60 and the magnetic loss mu' is below 1.5. The effective permeability μ' is obtained by measuring the inductance and resistance value at a carrier frequency (13.4MHz) using an impedance analyzer (provided by Agilent Technology) and calculating the permeability.
The gloss of the obtained electromagnetic interference suppressing coating layer was measured to be 37% at an incident angle of 60 ° (-60 °) using a gloss meter. The gloss is preferably in the range of 20 to 50%.
The tensile strength of a sample 0.08mm thick, 50mm wide and 100mm long was measured to be 22MPa using a tensile tester. The tensile strength is preferably in the range of 20 to 50 MPa.
Using a wear tester at 50N/m2The sample of the electromagnetic wave interference suppression coating is worn for 30mins under pressure, the abrasion loss is less than 5%, the obtained coating is not observed to fall off, and the soft magnetic powder does not fall off when the coating is touched.
The prepared electromagnetic wave interference suppression coating shows good results in magnetic permeability, glossiness, tensile strength, electric resistance, flexibility and shape retentivity.
Example 6
138 parts by weight of thermoplastic polyurethane (manufactured by Sigma-Aldrich, average molecular weight: 40 ten thousand) was dissolved in 322 parts by weight of cyclohexanone as an organic solvent to prepare a glue, and 500 parts by weight of Fe-Si-Al alloy soft magnetic powder (specific surface area: 0.23 m)2G, anisotropic magnetic field 115Oe, resonance frequency fr ″: 2000MHz) was dispersed in the glue, and then 764 parts by weight of cyclohexanone, 4.3 parts by weight of organic hardener 1, 3-bis (t-butylperoxyisopropyl) benzene, 4.3 parts by weight of N, N' -m-phenylene bismaleimide, 6 parts by weight of surfactant di (2-ethylhexyl) phthalate were added to make a uniform coating.
Adjusting the temperature of the coating to 25 ℃, coating the coating at a coating speed of 4.2m/min and spreading the coating on a continuously rotating PET high polymer film support to form a coating, simultaneously carrying out orientation treatment on the coating by a rotating magnetic field, drying the coating by a drying oven at three stages of 85 ℃, 95 ℃ and 105 ℃, drying by a drying oven at a fourth stage, a fifth stage and a sixth stage at a temperature of 115 ℃, 120 ℃ and 130 ℃, and finally drying by a drying oven at a seventh stage of 140 ℃, so as to obtain the coating with the thickness of about 0.1mm after drying.
And peeling the formed coating from the PET high polymer film support. 1 piece of the coating was prepared by peeling off, and both sides of the coating were sandwiched by PET, and further, a paper material having a thickness of 100 μm was disposed on both sides as a buffer material, and both sides were sandwiched by two stainless steel plates, and curing was carried out by a drum vulcanizer at a curing speed of 2.5m/min at 175 ℃ under a pressure of 8.5MPa, to obtain an electromagnetic interference suppressing coating.
The obtained emi suppression coating was subjected to a heat resistance test (left to stand in an oven at a temperature of 80 ℃ and a humidity of 60 Rh% for 72 hours), and the thickness of the emi suppression coating after the heat resistance test was changed in the direction of decreasing thickness, but the rate of change was less than 1% based on the emi suppression coating before the heat resistance test. The effective permeability mu 'value is above 60 and the magnetic loss mu' is below 1.5. The effective permeability μ' is obtained by measuring the inductance and resistance value at a carrier frequency (13.4MHz) using an impedance analyzer (provided by Agilent Technology) and calculating the permeability.
The gloss of the obtained electromagnetic interference suppressing coating layer was measured to be 42% at an incident angle of 60 ° (-60 °) using a gloss meter. The gloss is preferably in the range of 20 to 50%.
The tensile strength of a sample 0.08mm thick, 50mm wide and 100mm long was measured to be 29MPa using a tensile tester. The tensile strength is preferably in the range of 20 to 50 MPa.
Using a wear tester at 50N/m2The sample of the electromagnetic wave interference suppression coating is worn for 30mins under pressure, the abrasion loss is less than 5%, the obtained coating is not observed to fall off, and the soft magnetic powder does not fall off when the coating is touched.
The prepared electromagnetic wave interference suppression coating shows good results in magnetic permeability, glossiness, tensile strength, electric resistance, flexibility and shape retentivity.
Example 7
42 parts by weight of thermoplastic polyurethane (manufactured by Sigma-Aldrich, average molecular weight 40 ten thousand) was dissolved in 98 parts by weight of an organic solventParts of cyclohexanone were dissolved to prepare a glue, and 500 parts by weight of soft magnetic powder (specific surface area 0.23 m) of Fe-Si-Al alloy2G, anisotropic magnetic field 115Oe, resonance frequency fr ″: 2000MHz) was dispersed in the glue, and then 198 parts by weight of cyclohexanone, 4.2 parts by weight of organic curing agent 1, 3-bis (t-butylperoxyisopropyl) benzene, 4.2 parts by weight of N, N' -m-phenylene bismaleimide, and 10 parts by weight of surfactant di (2-ethylhexyl) phthalate were added to make a uniform coating.
Adjusting the temperature of the coating to 25 ℃, coating the coating at a coating speed of 4m/min and flatly spreading the coating on a continuously rotating PET high polymer film support to form a coating, simultaneously carrying out orientation treatment on the coating by a rotating magnetic field, drying the coating by a tertiary oven at 85 ℃, 95 ℃ and 105 ℃, then drying by a quaternary, a quinary and a quinary oven at 115 ℃, 120 ℃ and 130 ℃, and finally drying by a quinary oven at 140 ℃, thus obtaining the coating with the thickness of about 0.1mm after drying.
And peeling the formed coating from the PET high polymer film support. 1 piece of the coating was prepared by peeling off, and both sides of the coating were sandwiched by PET, and further, a paper material having a thickness of 100 μm was disposed on both sides as a buffer material, and both sides were sandwiched by two stainless steel plates, and curing was carried out by a drum vulcanizer at a curing speed of 2.5m/min at 175 ℃ under a pressure of 8.5MPa, to obtain an electromagnetic interference suppressing coating.
The obtained emi suppression coating was subjected to a heat resistance test (left to stand in an oven at a temperature of 80 ℃ and a humidity of 60 Rh% for 72 hours), and the thickness of the emi suppression coating after the heat resistance test was changed in the direction of decreasing thickness, but the rate of change was less than 1% based on the emi suppression coating before the heat resistance test. The effective permeability mu 'value is above 70 and the magnetic loss mu' is below 1.5. The effective permeability μ' is obtained by measuring the inductance and resistance value at a carrier frequency (13.4MHz) using an impedance analyzer (provided by Agilent Technology) and calculating the permeability.
The gloss of the obtained electromagnetic interference suppressing coating layer was measured to be 49% at an incident angle of 60 ° (-60 °) using a gloss meter. The gloss is preferably in the range of 20 to 50%.
The tensile strength of a sample 0.08mm thick, 50mm wide and 100mm long was measured to be 21MPa using a tensile tester. The tensile strength is preferably in the range of 20 to 50 MPa.
Using a wear tester at 50N/m2The sample of the electromagnetic wave interference suppression coating is worn for 30mins under pressure, the abrasion loss is less than 8%, the obtained coating is not observed to fall off, and the soft magnetic powder does not fall off when the coating is touched.
The prepared electromagnetic wave interference suppression coating shows good results in magnetic permeability, glossiness, tensile strength, electric resistance, flexibility and shape retentivity.
Example 8
90 parts by weight of thermoplastic polyurethane (manufactured by Sigma-Aldrich, average molecular weight: 40 ten thousand) was dissolved with 270 parts by weight of cyclohexanone as an organic solvent to prepare a glue, and 500 parts by weight of Fe-Si-Al alloy soft magnetic powder (specific surface area: 0.23 m)2G, anisotropic magnetic field 115Oe, resonance frequency fr ″: 2000MHz) was dispersed in the glue, followed by addition of 135 parts by weight of cyclohexanone, 2.5 parts by weight of 1, 3-bis (t-butylperoxyisopropyl) benzene as an organic curing agent, 2.5 parts by weight of N, N' -m-phenylene bismaleimide, and 4 parts by weight of di (2-ethylhexyl) phthalate as a surfactant, to prepare a uniform coating.
Adjusting the temperature of the coating to 25 ℃, coating the coating at a coating speed of 3m/min and flatly spreading the coating on a continuously rotating PET high polymer film support to form a coating, simultaneously carrying out orientation treatment on the coating by a rotating magnetic field, drying the coating by a tertiary oven at 85 ℃, 95 ℃ and 105 ℃, then drying by a quaternary, a quinary and a quinary oven at 115 ℃, 120 ℃ and 130 ℃, and finally drying by a quinary oven at 140 ℃, thus obtaining the coating with the thickness of about 0.1mm after drying.
And peeling the formed coating from the PET high polymer film support. Preparing 1 piece of peeled coating, clamping two sides of the coating by using the peeled PET, further configuring paper materials with the thickness of 100 mu m on the two sides as buffer materials, clamping two sides by using two stainless steel plates, and curing by using a drum vulcanizer at the curing speed of 2.5m/min at the temperature of 175 ℃ under the pressure of 8Mpa to obtain the electromagnetic wave interference suppression coating.
The obtained emi suppression coating was subjected to a heat resistance test (left to stand in an oven at a temperature of 80 ℃ and a humidity of 60 Rh% for 72 hours), and the thickness of the emi suppression coating after the heat resistance test was changed in the direction of decreasing thickness, but the rate of change was less than 1% based on the emi suppression coating before the heat resistance test. The effective permeability mu 'value is above 70 and the magnetic loss mu' is below 1.5. The effective permeability μ' is obtained by measuring the inductance and resistance value at a carrier frequency (13.4MHz) using an impedance analyzer (provided by Agilent Technology) and calculating the permeability.
The gloss of the obtained electromagnetic interference suppressing coating layer was measured to be 49% at an incident angle of 60 ° (-60 °) using a gloss meter. The gloss is preferably in the range of 20 to 50%.
The tensile strength of a sample 0.08mm thick, 50mm wide and 100mm long was measured to be 29MPa using a tensile tester. The tensile strength is preferably in the range of 20 to 50 MPa.
Using a wear tester at 50N/m2The sample of the electromagnetic wave interference suppression coating is worn for 30mins under pressure, the abrasion loss is less than 6%, the obtained coating is not observed to fall off, and the soft magnetic powder does not fall off when the coating is touched.
The prepared electromagnetic wave interference suppression coating shows good results in magnetic permeability, glossiness, tensile strength, electric resistance, flexibility and shape retentivity.
Example 9
84 parts by weight of thermoplastic polyurethane (manufactured by Sigma-Aldrich, average molecular weight: 40 ten thousand) was dissolved in 196 parts by weight of cyclohexanone as an organic solvent to prepare a glue, and 500 parts by weight of Fe-Si-Al alloy soft magnetic powder (specific surface area: 0.23 m)2G, anisotropic magnetic field 115Oe, resonance frequency fr ″: 2000MHz) was dispersed in the glue, then 204 parts by weight of cyclohexanone, 8 parts by weight of organic curing agent 1, 3-bis (t-butylperoxyisopropyl) benzene, 8 parts by weight of N, N' -m-phenylene bismaleimide, 5 parts by weight of surfactant di (2-ethylhexyl) phthalate were added to make a uniform coating.
Adjusting the temperature of the coating to 25 ℃, coating the coating at a coating speed of 3m/min and flatly spreading the coating on a continuously rotating PET high polymer film support to form a coating, simultaneously carrying out orientation treatment on the coating by a rotating magnetic field, drying the coating by a tertiary oven at 85 ℃, 95 ℃ and 105 ℃, then drying by a quaternary, a quinary and a quinary oven at 115 ℃, 120 ℃ and 130 ℃, and finally drying by a quinary oven at 140 ℃, thus obtaining the coating with the thickness of about 0.1mm after drying.
And peeling the formed coating from the PET high polymer film support. Preparing 1 piece of peeled coating, clamping two sides of the coating by using the peeled PET, further configuring paper materials with the thickness of 100 mu m on the two sides as buffer materials, clamping two sides by using two stainless steel plates, and curing by using a drum vulcanizer at the curing speed of 2.5m/min at the temperature of 175 ℃ under the pressure of 8Mpa to obtain the electromagnetic wave interference suppression coating.
The obtained emi suppression coating was subjected to a heat resistance test (left to stand in an oven at a temperature of 80 ℃ and a humidity of 60 Rh% for 72 hours), and the thickness of the emi suppression coating after the heat resistance test was changed in the direction of decreasing thickness, but the rate of change was less than 1% based on the emi suppression coating before the heat resistance test. The effective permeability mu 'value is above 70 and the magnetic loss mu' is below 1.5. The effective permeability μ' is obtained by measuring the inductance and resistance value at a carrier frequency (13.4MHz) using an impedance analyzer (provided by Agilent Technology) and calculating the permeability.
The gloss of the obtained electromagnetic interference suppressing coating layer was measured to be 46% at an incident angle of 60 ° (-60 °) using a gloss meter. The gloss is preferably in the range of 20 to 50%.
The tensile strength of a sample 0.08mm thick, 50mm wide and 100mm long was measured to be 28MPa using a tensile tester. The tensile strength is preferably in the range of 20 to 50 MPa.
Using a wear tester at 50N/m2The sample of the electromagnetic wave interference suppression coating is worn for 30mins under pressure, the abrasion loss is less than 3%, the obtained coating is not observed to fall off, and the soft magnetic powder does not fall off when the coating is touched.
The prepared electromagnetic wave interference suppression coating shows good results in magnetic permeability, glossiness, tensile strength, electric resistance, flexibility and shape retentivity.
Example 10
82 parts by weight of thermoplastic polyurethane (manufactured by Sigma-Aldrich, average molecular weight: 40 ten thousand) was dissolved in 196 parts by weight of cyclohexanone as an organic solvent to prepare a glue, and 500 parts by weight of Fe-Si-Al alloy soft magnetic powder (specific surface area: 0.23 m)2G, anisotropic magnetic field 115Oe, resonance frequency fr ″: 2000MHz) was dispersed in the glue, then 204 parts by weight of cyclohexanone, 2 parts by weight of di (2-ethylhexyl) phthalate, 8 parts by weight of 1, 3-bis (tert-butylperoxyisopropyl) benzene as an organic curing agent, 8 parts by weight of N, N' -m-phenylene bismaleimide, 3 parts by weight of di (2-ethylhexyl) phthalate as a surfactant were added to make a uniform coating.
Adjusting the temperature of the coating to 25 ℃, coating the coating at a coating speed of 3m/min and flatly spreading the coating on a continuously rotating PET high polymer film support to form a coating, simultaneously carrying out orientation treatment on the coating by a rotating magnetic field, drying the coating by a tertiary oven at 85 ℃, 95 ℃ and 105 ℃, then drying by a quaternary, a quinary and a quinary oven at 115 ℃, 120 ℃ and 130 ℃, and finally drying by a quinary oven at 140 ℃, thus obtaining the coating with the thickness of about 0.1mm after drying.
And peeling the formed coating from the PET high polymer film support. Preparing 1 piece of peeled coating, clamping two sides of the coating by using the peeled PET, further configuring paper materials with the thickness of 100 mu m on the two sides as buffer materials, clamping two sides by using two stainless steel plates, and curing by using a drum vulcanizer at the curing speed of 2.5m/min at the temperature of 175 ℃ under the pressure of 8Mpa to obtain the electromagnetic wave interference suppression coating.
The obtained emi suppression coating was subjected to a heat resistance test (left to stand in an oven at a temperature of 80 ℃ and a humidity of 60 Rh% for 72 hours), and the thickness of the emi suppression coating after the heat resistance test was changed in the direction of decreasing thickness, but the rate of change was less than 1% based on the emi suppression coating before the heat resistance test. The effective permeability mu 'value is above 70 and the magnetic loss mu' is below 1.5. The effective permeability μ' is obtained by measuring the inductance and resistance value at a carrier frequency (13.4MHz) using an impedance analyzer (provided by Agilent Technology) and calculating the permeability.
The gloss of the obtained electromagnetic interference suppressing coating layer was measured to be 46% at an incident angle of 60 ° (-60 °) using a gloss meter. The gloss is preferably in the range of 20 to 50%.
The tensile strength of a sample 0.08mm thick, 50mm wide and 100mm long was measured to be 28MPa using a tensile tester. The tensile strength is preferably in the range of 20 to 50 MPa.
Using a wear tester at 50N/m2The sample of the electromagnetic wave interference suppression coating is worn for 30mins under pressure, the abrasion loss is less than 3%, the obtained coating is not observed to fall off, and the soft magnetic powder does not fall off when the coating is touched.
The prepared electromagnetic wave interference suppression coating shows good results in magnetic permeability, glossiness, tensile strength, electric resistance, flexibility and shape retentivity.
Example 11
84 parts by weight of thermoplastic polyurethane (manufactured by Sigma-Aldrich, average molecular weight: 40 ten thousand) was dissolved in 196 parts by weight of cyclohexanone as an organic solvent to prepare a glue, and 500 parts by weight of Fe-Si-Al alloy soft magnetic powder (specific surface area: 0.23 m)2G, anisotropic magnetic field 115Oe, resonance frequency fr ″: 2000MHz) was dispersed in the glue, followed by addition of 174 parts by weight of cyclohexanone, 30 parts by weight of di (2-ethylhexyl) phthalate, 2 parts by weight of di (2-ethylhexyl) phthalate, 8 parts by weight of organic hardener 1, 3-bis (tert-butylperoxyisopropyl) benzene, 8 parts by weight of N, N' -m-phenylene bismaleimide, 5 parts by weight of di (2-ethylhexyl) phthalate, a surfactant, to prepare a uniform coating.
Adjusting the temperature of the coating to 25 ℃, coating the coating at a coating speed of 3m/min and flatly spreading the coating on a continuously rotating PET high polymer film support to form a coating, simultaneously carrying out orientation treatment on the coating by a rotating magnetic field, drying the coating by a tertiary oven at 85 ℃, 95 ℃ and 105 ℃, then drying by a quaternary, a quinary and a quinary oven at 115 ℃, 120 ℃ and 130 ℃, and finally drying by a quinary oven at 140 ℃, thus obtaining the coating with the thickness of about 0.1mm after drying.
And peeling the formed coating from the PET high polymer film support. Preparing 1 piece of peeled coating, clamping two sides of the coating by using the peeled PET, further configuring paper materials with the thickness of 100 mu m on the two sides as buffer materials, clamping two sides by using two stainless steel plates, and curing by using a drum vulcanizer at the curing speed of 2.5m/min at the temperature of 175 ℃ under the pressure of 8Mpa to obtain the electromagnetic wave interference suppression coating.
The obtained emi suppression coating was subjected to a heat resistance test (left to stand in an oven at a temperature of 80 ℃ and a humidity of 60 Rh% for 72 hours), and the thickness of the emi suppression coating after the heat resistance test was changed in the direction of decreasing thickness, but the rate of change was less than 1% based on the emi suppression coating before the heat resistance test. The effective permeability mu 'value is above 70 and the magnetic loss mu' is below 1.5. The effective permeability μ' is obtained by measuring the inductance and resistance value at a carrier frequency (13.4MHz) using an impedance analyzer (provided by Agilent Technology) and calculating the permeability.
The gloss of the obtained electromagnetic interference suppressing coating layer was measured to be 46% at an incident angle of 60 ° (-60 °) using a gloss meter. The gloss is preferably in the range of 20 to 50%.
The tensile strength of a sample 0.08mm thick, 50mm wide and 100mm long was measured to be 28MPa using a tensile tester. The tensile strength is preferably in the range of 20 to 50 MPa.
Using a wear tester at 50N/m2The sample of the electromagnetic wave interference suppression coating is worn for 30mins under pressure, the abrasion loss is less than 3%, the obtained coating is not observed to fall off, and the soft magnetic powder does not fall off when the coating is touched.
The prepared electromagnetic wave interference suppression coating shows good results in magnetic permeability, glossiness, tensile strength, electric resistance, flexibility and shape retentivity.
While the invention has been described above with reference to certain embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the various embodiments of the present disclosure may be used in any combination, provided that there is no structural conflict, and the combination is not exhaustively described in this specification for brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (6)

1. The electromagnetic wave interference inhibiting paint is characterized by comprising 29-59% of soft magnetic powder, 5-9% of thermoplastic polyurethane, 0.5-1.6% of organic curing agent, 35-62% of organic solvent and 0.2-3% of surfactant in percentage by weight;
wherein the soft magnetic powder is Fe-Si-Al alloy powder, the organic curing agent comprises 1, 3-bis (tert-butylperoxyisopropyl) benzene and N, N' -m-phenylene bismaleimide, the molecular weight of the thermoplastic polyurethane is 10000-1000000g/mol, the thermoplastic polyurethane is dissolved by an organic solvent to prepare a solution with the solid content of 30% for storage and standby, and the surfactant is di (2-ethylhexyl) phthalate;
the method for preparing the electromagnetic interference coating by using the electromagnetic interference inhibition coating sequentially comprises the following steps: (1) coating the electromagnetic interference suppression coating on a continuously rotating polymer film support to form a coating, performing orientation treatment on the coating by a rotating magnetic field, and then drying at 85-155 ℃, wherein the thickness of the formed coating is 0.06-0.2 mm; (2) and (3) post-treatment: stripping the formed coating from the polymer film support, and curing at least one layer of the formed coating at a curing temperature of 170-200 ℃ and a curing pressure of 6-8.5MPa to obtain the electromagnetic wave interference suppression coating.
2. The electromagnetic wave interference suppressing paint as claimed in claim 1, wherein: the organic solvent comprises at least one of cyclohexanone, tetrahydrofuran, acetone, methyl ethyl ketone, methyl isobutyl ketone, toluene, xylene, benzene, ethyl acetate, n-butyl acetate and dioxane.
3. A preparation method of an electromagnetic wave interference suppression coating is characterized by sequentially comprising the following steps:
(1) coating the electromagnetic interference suppressing coating material as claimed in any one of claims 1 or 2 on a continuously rotating polymer film support to form a coating layer, and simultaneously subjecting the coating layer to a rotating magnetic field orientation treatment, followed by drying treatment at 85-155 ℃ to form a coating layer having a thickness of 0.06mm-0.2 mm;
(2) and (3) post-treatment: stripping the formed coating from the polymer film support, and curing at least one layer of the formed coating at a curing temperature of 170-200 ℃ and a curing pressure of 6-8.5MPa to obtain the electromagnetic wave interference suppression coating.
4. The method for preparing an electromagnetic wave interference suppressing coating layer as set forth in claim 3, wherein: in the step (1), the drying treatment is a gradient and sectional heating process, and the coating speed is in the range of 2-4.2 m/min.
5. The method for preparing an electromagnetic wave interference suppressing coating layer as set forth in claim 4, wherein: the speed range of the curing treatment in the step (2) is 0.3-2.5 m/min.
6. An electromagnetic wave interference suppressing coating prepared by the method of claim 5.
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