A soft magnetic composite material, its preparation method and application

Abstract

The present invention belongs to the technical field of soft magnetic materials, and particularly relates to a soft magnetic composite material, a preparation method thereof and an application. The raw material components of the soft magnetic composite material of the present invention include a magnetic conductor, a binder and an auxiliary agent; and the mass ratio of the magnetic conductor, the binder and the auxiliary agent is (70-93):(4.5-22):(2.7-9); the binder is a polymer material; the binder includes at least one of rubber, resin and ester compounds. The soft magnetic composite material of the present invention has excellent magnetic permeability, can greatly optimize the attenuation of magnetic permeability at high frequencies; has a high working frequency, which can be increased from 0.1 MHz of amorphous to 3 MHz; the width can reach 900 mm; the product thickness can be adjusted, and a single layer can reach 0.5 mm, without the need for multi-layer lamination, greatly simplifying the production process and reducing the cost; in addition, the product of the present invention has good flexibility, does not require crushing treatment, and is convenient and simple to assemble.

Description

Technical Field

[0001] The present invention belongs to the technical field of soft magnetic materials, and particularly relates to a soft magnetic composite material, a preparation method thereof, and an application thereof. Background Art

[0002] The heat-not-burn electronic cigarette achieves the purpose of smoking tobacco products or tobacco-like products by means of non-combustion low-temperature heating (around 300 °C). Compared with the traditional method of burning tobacco, this method only produces distillation and simple pyrolysis reactions.

[0003] Currently, the magnetic conductors used in the inductive heating components of heat-not-burn smoking devices mainly use amorphous or nanocrystalline ribbons, which are placed around the electromagnetic induction coil of the electromagnetic induction heating device by multi-layer winding with double-sided tape. However, due to the following problems of amorphous and nanocrystalline materials: (1) The amorphous and nanocrystalline ribbons themselves have the property of a glassy atomic structure, making them hard and brittle and difficult to process; (2) The single-layer thickness is only 0.025 mm. When a thicker ribbon is required in actual production, multiple layers need to be laminated. When it is more than 0.3 mm, even 8-10 layers of lamination are required, and the process is complex and cumbersome, and the processing cost is high; (3) The working frequency of the amorphous and nanocrystalline ribbons is low, and the magnetic permeability is low, while the inductive heating efficiency is positively correlated with the circuit working frequency; (4) After the amorphous and nanocrystalline ribbons are annealed, they need to be crushed. After crushing, it is easy to drop debris, and on the one hand, the debris will cause a short circuit of the circuit, and on the other hand, it will also be inhaled into the human lungs, which is harmful to the human body; (5) There are limitations in the width of the amorphous and nanocrystalline ribbons. Currently, the width cannot exceed 300 mm, which limits both the production efficiency and the automated production.

[0004] Therefore, there is an urgent need to provide a soft magnetic composite material that has good magnetic permeability, working frequency, controllable thickness and width; and is simple to process and has a low cost. Summary of the Invention

[0005] The present invention aims to solve one or more technical problems existing in the prior art, and at least provides a beneficial choice or creation condition. The present invention provides a soft magnetic composite material that has good magnetic permeability, working frequency, controllable thickness and width; and is simple to process and has a low cost.

[0006] Inventive concept of the present invention: The raw material components of the soft magnetic composite material of the present invention include a magnetic conductor, a binder, and an auxiliary agent; the mass ratio of the magnetic conductor, the binder, and the auxiliary agent is (70-93):(4.5-22):(2.7-9); the binder includes at least one of rubber, resin, and ester compounds; the auxiliary agent includes a vulcanizing agent. The present invention obtains a soft magnetic composite material by compounding a magnetic conductor, a binder, and an auxiliary agent in a certain proportion, and uses a specific type of polymer material as an adhesive to manufacture a magnetic conductive material, avoiding the complex processing technology of amorphous or nanocrystalline ribbons, while achieving the magnetic conductivity function of amorphous or nanocrystalline ribbons, realizing the normal operation of the electronic cigarette device while reducing costs. The heat source for the electronic cigarette device is provided by electromagnetic induction, which has good magnetic permeability and high working frequency, and can be increased from 0.1 MHz of amorphous to 3 MHz; the width can reach 900 mm, the thickness can be adjusted, and the production process is greatly simplified.

[0007] Therefore, in the first aspect of the present invention, a soft magnetic composite material is provided.

[0008] Specifically, a soft magnetic composite material, the raw material components of which include a magnetic conductor, a binder, and an auxiliary agent; and the mass ratio of the magnetic conductor, the binder, and the auxiliary agent is (70-93):(4.5-22):(2.7-9);

[0009] The binder includes at least one of rubber, resin, and ester compounds;

[0010] The auxiliary agent includes a vulcanizing agent.

[0011] Preferably, the mass ratio of the magnetic conductor, the binder, and the auxiliary agent is (75-90):(5-20):(3-8).

[0012] Preferably, the magnetic conductor includes at least one of iron-based soft magnetic materials and iron-based alloys.

[0013] Preferably, the iron-based soft magnetic material includes at least one of ferrite, magnetic iron nanomaterials, and carbonyl iron powder.

[0014] Preferably, the iron-based alloy includes at least one of iron silicon aluminum, iron silicon, iron nickel, iron nickel molybdenum, iron silicon boron copper niobium, and iron silicon boron copper niobium nickel molybdenum.

[0015] Preferably, the binder includes at least one of polyurethane, acrylic resin, nitrile rubber, vinyl acetate, polyvinyl alcohol resin, epoxy resin, silicone rubber, and fluororubber.

[0016] Preferably, the auxiliary agent further includes at least one of a plasticizer, a promoter, an activator, and an antioxidant.

[0017] Preferably, the auxiliary agent further includes a plasticizer, a promoter, an activator, and an antioxidant.

[0018] Preferably, in the auxiliary agent, the mass ratio of the plasticizer, accelerator, activator, antioxidant, and vulcanizing agent is (1.3 - 2.2):(0.25 - 1.1):(0.45 - 1.7):(0.45 - 1.7):(0.25 - 1.1).

[0019] More preferably, the mass ratio of the plasticizer, accelerator, activator, antioxidant, and vulcanizing agent is (1.5 - 2):(0.3 - 1):(0.5 - 1.5):(0.5 - 1.5):(0.3 - 1).

[0020] Preferably, the plasticizer is a non - phthalate plasticizer.

[0021] More preferably, the plasticizer is diisononyl cyclohexane - 1,2 - dicarboxylate.

[0022] Preferably, the accelerator is selected from at least one of thiazoles, guanidines, sulfenamides, imides, and aldehyde amines.

[0023] Preferably, the activator is a stearate.

[0024] More preferably, the activator is selected from at least one of zinc stearate and calcium stearate.

[0025] Preferably, the antioxidant is selected from at least one of pentaerythritol tetra[β - (3,5 - di - tert - butyl - 4 - hydroxyphenyl)propionate] (antioxidant 1010), distearyl pentaerythritol diphosphite (antioxidant 618), and tris(2,4 - di - tert - butylphenyl) phosphite (antioxidant 168).

[0026] Preferably, the vulcanizing agent is a peroxide vulcanizing agent.

[0027] Preferably, the vulcanizing agent includes at least one of dicumyl peroxide (DCP), 2,5 - dimethyl - 2,5 - di - tert - butylperoxyhexane (DPBMH), and di - tert - butyl peroxide cumene (BIPB).

[0028] Preferably, the soft magnetic composite material is selected from any one of sheet materials and coil materials.

[0029] The second aspect of the present invention provides a method for preparing the soft magnetic composite material described in the first aspect of the present invention.

[0030] Specifically, the method for preparing the soft magnetic composite material includes the following steps:

[0031] Mix the raw material components and vulcanize to obtain the soft magnetic composite material.

[0032] Preferably, the method for preparing the soft magnetic composite material comprises the following steps:

[0033] (1) Mix the raw material components and coat them to obtain a film; or, mix the raw material components and calender them to obtain a sheet;

[0034] (2) Vulcanize the single-layer film or single-layer sheet obtained in step (1) to obtain the soft magnetic composite material; or, calender and vulcanize at least two layers of films or at least two layers of sheets obtained in step (1) to obtain the soft magnetic composite material; or, calender and vulcanize at least one layer of film and at least one layer of sheet obtained in step (1) to obtain the soft magnetic composite material.

[0035] Preferably, in step (1), the raw material components are mixed in an organic solvent, and the organic solvent includes cyclohexanone.

[0036] Preferably, in step (1), after coating, there is also a process of drying to remove the organic solvent.

[0037] Preferably, in step (1), the calendering speed is 25 - 35 Hz, and the calendering temperature is 27 - 55 °C; further preferably, in step (1), the calendering speed is 27 - 33 Hz, and the calendering temperature is 30 - 50 °C.

[0038] Preferably, in step (2), the vulcanization is selected from any one of calender vulcanization and mold pressing vulcanization.

[0039] Preferably, for the calender vulcanization, the calendering rotation speed is 1 - 38 Hz, and the calendering temperature is 135 - 165 °C; further preferably, for the calender vulcanization, the calendering rotation speed is 1 - 35 Hz, and the calendering temperature is 140 - 160 °C.

[0040] Preferably, for the mold pressing vulcanization, the mold pressing pressure is 9 - 270 MPa, and the mold pressing temperature is 130 - 185 °C; further preferably, for the mold pressing vulcanization, the mold pressing pressure is 10 - 250 MPa, and the mold pressing temperature is 140 - 175 °C.

[0041] Preferably, in step (2), when vulcanizing, protective films need to be covered on the upper and lower surfaces of the product to be vulcanized.

[0042] Preferably, in step (2), the calendering speed is 25 - 35 Hz, and the calendering temperature is 27 - 55 °C; further preferably, in step (2), the calendering speed is 27 - 33 Hz, and the calendering temperature is 30 - 50 °C.

[0043] Preferably, the thickness of the protective film is 4.5 - 160 μm; more preferably, the thickness of the protective film is 5 - 150 μm.

[0044] Preferably, the protective film is selected from any one of PET film, PI film, PE film, PP film, copper foil, aluminum foil, aluminum foil mylar, and copper foil mylar.

[0045] Preferably, the mylar material in the aluminum foil mylar and copper foil mylar is selected from any one of PET film and PI film.

[0046] Preferably, the thickness of the mylar material is 4.5 - 110 μm; more preferably, the thickness of the mylar material is 5 - 100 μm.

[0047] Preferably, after the soft magnetic composite material is obtained by vulcanization, it further includes attaching an adhesive to the sheet or roll material, and then performing die-cutting to obtain a finished product for assembly.

[0048] Preferably, the adhesive is double-sided tape or glue.

[0049] Specifically, the function of the binder is to paste and assemble the soft magnetic composite material with other components of the electronic cigarette.

[0050] The third aspect of the present invention provides an electronic cigarette device.

[0051] Specifically, the electronic cigarette device includes the soft magnetic composite material described in the first aspect of the present invention.

[0052] Compared with the prior art, the beneficial effects of the technical solution provided by the present invention are as follows:

[0053] In the present invention, a magnetic conductor, a binder, and an additive are compounded in a certain proportion, and a specific type of polymer material is used as the binder to produce the magnetic conductive material, avoiding the complex processing technology of amorphous or nanocrystalline strip materials, while achieving the magnetic conductive function of amorphous or nanocrystalline strip materials. It realizes the normal operation of the electronic cigarette device while reducing costs. It has excellent magnetic permeability and can significantly optimize the attenuation of magnetic permeability at high frequencies; it has a high working frequency, which can be increased from 0.1 MHz of amorphous to 3 MHz; the width can reach 900 mm, and it can be continuously wound and die-cut in large quantities according to the design of the automated production line; the present invention is a polymer composite material, and the product thickness can be arbitrarily controlled, and a single layer can reach 0.5 mm, without the need for multi-layer lamination, greatly simplifying the production process, with low costs and facilitating industrial application; in addition, the product of the present invention can overcome the hard and brittle problems of traditional amorphous materials, has good flexibility, does not require crushing treatment, and is convenient for assembly. Description of the Drawings

[0054] Figure 1Schematic cross-sectional view of the soft magnetic composite material obtained in step (3) of Embodiment 1 of the present invention;

[0055] Figure 2 Schematic structural view of the soft magnetic composite material matching the electronic cigarette device prepared in Embodiment 1 of the present invention;

[0056] Figure 3 Schematic structural view of the electronic cigarette device after the soft magnetic composite material of Embodiment 1 of the present invention is applied to the electronic cigarette device;

[0057] Figure 4 Magnetic permeability curve graph of the soft magnetic composite materials of Embodiments 1-5 of the present invention and the commercially available product amorphous strip of Comparative Example 1;

[0058] Figure 5 Magnetic permeability curve graph of the soft magnetic composite material of Embodiment 2 of the present invention and the material of Comparative Example 2. Detailed implementation manners

[0059] In order to make those skilled in the art more clearly understand the technical solutions of the present invention, the following embodiments are listed for illustration. It should be noted that the following embodiments do not limit the scope of protection required by the present invention.

[0060] The raw materials, reagents or devices used in the following embodiments can be obtained from conventional commercial channels or can be obtained by existing known methods without special instructions.

[0061] Embodiment 1

[0062] A soft magnetic composite material, by weight, its raw material components include 83 parts of flaky iron-silicon soft magnetic powder, 12 parts of nitrile rubber, 1 part of cyclohexane 1,2-dicarboxylic acid diisononyl ester plasticizer, 0.5 part of N-(diethyleneglycol)-2-benzothiazole sulfenamide accelerator, 1 part of zinc stearate activator, 0.5 part of antioxidant 1010, 0.5 part of antioxidant 168, and 2 parts of vulcanizing agent DCP.

[0063] A preparation method of a soft magnetic composite material, comprising the following steps:

[0064] (1) By weight, add flaky iron-silicon soft magnetic powder, nitrile rubber, cyclohexane 1,2-dicarboxylic acid diisononyl ester plasticizer, N-(diethyleneglycol)-2-benzothiazole sulfenamide accelerator, zinc stearate activator, antioxidant 1010, antioxidant 168, and vulcanizing agent DCP into cyclohexanone solvent, mix and stir evenly to obtain a slurry;

[0065] (2) Coating the slurry obtained in step (1) on a PET film with a thickness of 50 μm, drying it in a drying tunnel, and then peeling off the PET film to obtain a dry film;

[0066] (3) Cover each side of the dry film obtained in step (2) with a PET film having a thickness of 50 μm. The three-layer dry film is subjected to compression molding and vulcanization at 100 MPa, 150 °C for 15 min to obtain a rolled soft magnetic composite material with a thickness of 100 μm.

[0067] The present invention further includes backing double-sided adhesive and release paper on the soft magnetic composite material obtained in step (3) through a back gluing machine, and then performing die cutting to obtain a soft magnetic composite material matching an electronic cigarette device.

[0068] Among them, the preparation method of the flaky iron-silicon soft magnetic powder includes the following steps:

[0069] Stir the granular iron-silicon powder for 10 h, and then perform annealing treatment at a temperature of 750 °C for 30 min to obtain flaky iron-silicon soft magnetic powder with D10: 25 - 45 μm, D50: 65 - 95 μm, D90: 120 - 200 μm, and the powder thickness is 0.5 - 1.5 μm.

[0070] The cross-sectional schematic diagram of the soft magnetic composite material obtained in step (3) of Example 1 is as Figure 1 shown.

[0071] The structural schematic diagram of the soft magnetic composite material matching the electronic cigarette device prepared in Example 1 is as Figure 2 shown.

[0072] The structural schematic diagram of the electronic cigarette device after the soft magnetic composite material of Example 1 of the present invention is applied to the electronic cigarette device is as Figure 3 shown.

[0073] Example 2

[0074] A soft magnetic composite material, by weight, its raw material components include 85 parts of flaky iron-silicon-aluminum soft magnetic powder, 10 parts of polyurethane elastomer, 1 part of cyclohexane 1,2 - dicarboxylic acid diisononyl ester plasticizer, 0.5 part of N-(oxydiethylene)-2-benzothiazole sulfenamide accelerator, 1 part of zinc stearate activator, 0.5 part of antioxidant 1010, 0.5 part of antioxidant 168, and 2 parts of vulcanizing agent DCP.

[0075] A preparation method of a soft magnetic composite material includes the following steps:

[0076] (1) By weight, add flaky iron-silicon-aluminum soft magnetic powder, polyurethane elastomer, cyclohexane 1,2 - dicarboxylic acid diisononyl ester plasticizer, N-(oxydiethylene)-2-benzothiazole sulfenamide accelerator, zinc stearate activator, antioxidant 1010, antioxidant 168, and vulcanizing agent DCP into cyclohexanone solvent, mix and stir evenly to obtain a slurry;

[0077] (2) Coating the slurry obtained in step (1) onto a PET film with a thickness of 50 μm by means of coating, drying it in a drying oven, and then peeling off the PET film to obtain a dry film;

[0078] (3) Covering both sides of the dry film obtained in step (2) with PET films with a thickness of 50 μm, subjecting three layers of the dry film to molding by die pressing and vulcanization at 100 MPa, 150 °C for 15 min to obtain a rolled soft magnetic composite material with a thickness of 100 μm;

[0079] The present invention also includes applying double-sided adhesive and release paper to the soft magnetic composite material obtained in step (3) through a back coating machine, and then performing die cutting to obtain a soft magnetic composite material that matches an electronic cigarette device.

[0080] Among them, the preparation method of the flaky iron-silicon-aluminum soft magnetic powder includes the following steps:

[0081] Stirring and grinding the granular iron-silicon-aluminum powder for 10 h, and then performing annealing treatment at a temperature of 750 °C for 30 min to obtain a flaky iron-silicon-aluminum soft magnetic powder with D10: 25 - 45 μm, D50: 65 - 95 μm, D90: 120 - 200 μm, and the powder thickness is 0.5 - 1.5 μm.

[0082] Example 3

[0083] A soft magnetic composite material, by weight, its raw material components include 85 parts of flaky iron-silicon soft magnetic powder, 10 parts of polyurethane elastomer, 1 part of cyclohexane 1,2 - dicarboxylic acid diisononyl ester plasticizer, 0.5 part of N-(oxydiethylene)-2-benzothiazole sulfenamide accelerator, 1 part of zinc stearate activator, 0.5 part of antioxidant 1010, 0.5 part of antioxidant 168, and 2 parts of vulcanizing agent BIPB.

[0084] A preparation method of a soft magnetic composite material includes the following steps:

[0085] (1) By weight, adding flaky iron-silicon soft magnetic powder, polyurethane elastomer, cyclohexane 1,2 - dicarboxylic acid diisononyl ester plasticizer, N-(oxydiethylene)-2-benzothiazole sulfenamide accelerator, zinc stearate activator, antioxidant 1010, antioxidant 168, and vulcanizing agent BIPB into cyclohexanone solvent, mixing and stirring evenly to obtain a slurry;

[0086] (2) Coating the slurry obtained in step (1) onto a PET film with a thickness of 50 μm by means of coating, drying it in a drying oven, and then peeling off the PET film to obtain a dry film;

[0087] (3) Cover both sides of the dry film obtained in step (2) with PET films having a thickness of 50 μm. Three layers of the dry film are subjected to compression molding and vulcanization at 150 MPa, 150 °C for 15 min to obtain a rolled soft magnetic composite material with a thickness of 50 μm.

[0088] This invention also includes backing double-sided adhesive and release paper on the soft magnetic composite material obtained in step (3) through a backcoating machine, and then performing die cutting to obtain a soft magnetic composite material that matches an electronic cigarette.

[0089] Among them, the preparation method of the flaky iron-silicon soft magnetic powder includes the following steps:

[0090] Stir and grind the granular iron-silicon powder for 10 h, and then perform annealing treatment at a temperature of 700 °C for 30 min to obtain flaky iron-silicon soft magnetic powder with D10: 25 - 45 μm, D50: 65 - 95 μm, D90: 120 - 200 μm, and the powder thickness is 0.5 - 1.5 μm.

[0091] Example 4

[0092] A soft magnetic composite material, by weight, its raw material components include 85.5 parts of flaky iron-silicon-boron-copper-niobium-nickel-molybdenum soft magnetic powder, 9.5 parts of polyurethane elastomer, 1 part of cyclohexane 1,2 - dicarboxylic acid diisononyl ester plasticizer, 0.5 part of N-(oxydiethylene)-2-benzothiazole sulfenamide accelerator, 1 part of zinc stearate activator, 0.5 part of antioxidant 1010, 0.5 part of antioxidant 168, and 2 parts of vulcanizing agent BIPB.

[0093] A preparation method of a soft magnetic composite material includes the following steps:

[0094] (1) By weight, add flaky iron-silicon-boron-copper-niobium-nickel-molybdenum soft magnetic powder, polyurethane elastomer, cyclohexane 1,2 - dicarboxylic acid diisononyl ester plasticizer, N-(oxydiethylene)-2-benzothiazole sulfenamide accelerator, zinc stearate activator, antioxidant 1010, antioxidant 168, and vulcanizing agent BIPB into cyclohexanone solvent, and mix and stir evenly to obtain a slurry.

[0095] (2) Coat the slurry obtained in step (1) on a PET film with a thickness of 50 μm in a coating manner, dry it through a drying tunnel, and then peel off the PET film to obtain a dry film.

[0096] (3) Cover both sides of the dry film obtained in step (2) with PET films having a thickness of 50 μm. Three layers of the dry film are subjected to compression molding and vulcanization at 100 MPa, 150 °C for 15 min to obtain a rolled soft magnetic composite material with a thickness of 100 μm.

[0097] The present invention further includes applying double-sided adhesive and release paper to the soft magnetic composite material obtained in step (3) through a back-gluing machine, and then performing die-cutting to obtain a soft magnetic composite material matching an electronic cigarette.

[0098] Among them, the preparation method of the flaky iron-silicon-boron-copper-niobium-nickel-molybdenum soft magnetic powder includes the following steps:

[0099] Stir and grind the granular iron-silicon-boron-copper-niobium-nickel-molybdenum powder for 12 h, and then perform annealing treatment at a temperature of 450 °C for 30 min to obtain flaky iron-silicon-boron-copper-niobium-nickel-molybdenum powder with D10: 25-45 μm, D50: 65-95 μm, and D90: 120-200 μm, and the powder thickness is 0.5-1.5 μm.

[0100] Example 5

[0101] A soft magnetic composite material, by weight, its raw material components include 85 parts of flaky iron-silicon-boron-copper-niobium soft magnetic powder, 10 parts of polyurethane elastomer, 1 part of cyclohexane 1,2-dicarboxylic acid diisononyl ester plasticizer, 0.5 part of N-(oxydiethylene)-2-benzothiazole sulfenamide accelerator, 1 part of zinc stearate activator, 0.5 part of antioxidant 1010, 0.5 part of antioxidant 168, and 2 parts of vulcanizing agent DCP.

[0102] A preparation method of a soft magnetic composite material includes the following steps:

[0103] (1) By weight, add the flaky iron-silicon-boron-copper-niobium soft magnetic powder, polyurethane elastomer, cyclohexane 1,2-dicarboxylic acid diisononyl ester plasticizer, N-(oxydiethylene)-2-benzothiazole sulfenamide accelerator, zinc stearate activator, antioxidant 1010, antioxidant 168, and vulcanizing agent DCP into cyclohexanone solvent, mix and stir evenly to obtain a slurry;

[0104] (2) Coat the slurry obtained in step (1) on a PET film with a thickness of 50 μm by means of coating, dry it in a drying oven, and then peel off the PET film to obtain a dry film;

[0105] (3) Cover both sides of the dry film obtained in step (2) with PET films with a thickness of 50 μm, and subject 3 layers of dry films to molding by die pressing and vulcanization at 200 MPa, 150 °C for 15 min to obtain a rolled soft magnetic composite material with a thickness of 100 μm;

[0106] The present invention further includes applying double-sided adhesive and release paper to the soft magnetic composite material obtained in step (3) through a back-gluing machine, and then performing die-cutting to obtain a soft magnetic composite material matching an electronic cigarette.

[0107] Among them, the preparation method of the flaky iron-silicon-boron-copper-niobium soft magnetic powder includes the following steps:

[0108] The granular iron-silicon-boron-copper-niobium powder is stirred and milled for 10 h, and then annealed at a temperature of 400 °C for 30 min to obtain flaky iron-silicon-boron-copper-niobium soft magnetic powder with D10: 25-45 μm, D50: 65-95 μm, and D90: 120-200 μm, and the powder thickness is 0.5-1.5 μm.

[0109] Comparative Example 1

[0110] Comparative Example 1 is a commercially available product, the amorphous ribbon material in a heat-not-burn electronic cigarette.

[0111] Comparative Example 2

[0112] A soft magnetic composite material, by weight, its raw material components include 65 parts of flaky iron-silicon-aluminum soft magnetic powder, 25 parts of polyurethane elastomer, 1 part of cyclohexane 1,2-dicarboxylic acid diisononyl ester plasticizer, 0.5 part of N-(oxydiethylene)-2-benzothiazole sulfenamide accelerator, 1 part of zinc stearate activator, 0.5 part of antioxidant 1010, 0.5 part of antioxidant 168, and 2 parts of curing agent DCP.

[0113] A preparation method of a soft magnetic composite material includes the following steps:

[0114] (1) By weight, add flaky iron-silicon-aluminum soft magnetic powder, polyurethane elastomer, cyclohexane 1,2-dicarboxylic acid diisononyl ester plasticizer, N-(oxydiethylene)-2-benzothiazole sulfenamide accelerator, zinc stearate activator, antioxidant 1010, antioxidant 168, and curing agent DCP into cyclohexanone solvent, mix and stir evenly to obtain a slurry;

[0115] (2) Coating the slurry obtained in step (1) on a PET film with a thickness of 50 μm, drying it in a drying oven, and then peeling off the PET film to obtain a dry film;

[0116] (3) Cover both sides of the dry film obtained in step (2) with PET films with a thickness of 50 μm, and perform molding by compression molding and vulcanization at 100 MPa, 150 °C for 15 min to obtain a rolled soft magnetic composite material with a thickness of 100 μm;

[0117] The present invention further includes backing the soft magnetic composite material obtained in step (3) with double-sided tape and release paper through a back-coating machine, and then performing die-cutting to obtain a soft magnetic composite material matching an electronic cigarette device.

[0118] Among them, the preparation method of the flaky iron-silicon-aluminum soft magnetic powder includes the following steps:

[0119] The granular iron silicon aluminum powder is stirred and milled for 10 h, and then annealed at a temperature of 750 °C for 30 min to obtain flaky iron silicon aluminum soft magnetic powder with D10: 25 - 45 μm, D50: 65 - 95 μm, and D90: 120 - 200 μm, and the powder thickness is 0.5 - 1.5 μm.

[0120] Performance test

[0121] Magnetic permeability test

[0122] The magnetic permeability of the soft magnetic composites of Examples 1 - 5, the amorphous ribbon material of Comparative Example 1, and the soft magnetic composite material of Comparative Example 2 was tested using an impedance analyzer Keysight E4991.

[0123] The magnetic permeability test results are shown in Table 1; the magnetic permeability curves of the soft magnetic composites of Examples 1 - 5 and the commercially available amorphous ribbon of Comparative Example 1 are as Figure 4 shown; the magnetic permeability curves of the soft magnetic composite of Example 2 and the material of Comparative Example 2 are as Figure 5 shown.

[0124] Table 1: Magnetic permeability of the soft magnetic composites of Examples 1 - 5 and the materials of Comparative Examples 1 - 2

[0125] Test Items Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Permeability (H / m) 174 249 270 292 206 152 150

[0126] As can be seen from Table 1, the soft magnetic composite material of the present invention has good magnetic permeability. In addition, the operating frequency of the composite material is increased from 0.1 MHz of the amorphous ribbon material of Comparative Example 1 to 3 MHz of the soft magnetic composite material of the present invention.

[0127] In summary, the present invention obtains a soft magnetic composite material by compounding a magnetic conductor, an adhesive, and an auxiliary agent in a certain proportion, and uses a specific type of polymer material as an adhesive to produce a magnetic conductive material, avoiding the complex processing technology of amorphous or nanocrystalline ribbon materials, while achieving the magnetic conductive function of amorphous or nanocrystalline ribbon materials, realizing the normal operation of electronic cigarette devices while reducing costs. By means of electromagnetic induction, a heat source is provided for the electronic cigarette device, which has good magnetic permeability, a high operating frequency, can be increased from 0.1 MHz of amorphous to 3 MHz, and the production process is greatly simplified.

[0128] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A soft magnetic composite material, characterized in that: The raw material components are composed of a magnetic conductive agent, an adhesive, and an auxiliary agent; and the mass ratio of the magnetic conductive agent, the adhesive, and the auxiliary agent is (70-93): (4.5-22): (2.7-9); The adhesive is selected from any one of rubber, resin, and ester compounds; The auxiliary agent includes a vulcanizing agent, and at least one of a plasticizer, a accelerator, an activator, and an antioxidant; The vulcanizing agent is a peroxide vulcanizing agent.

2. The soft magnetic composite material according to claim 1, characterized in that: The magnetic conductive agent includes at least one of an iron-based soft magnetic material and an iron-based alloy.

3. The soft magnetic composite material according to claim 2, characterized in that: The iron-based soft magnetic material includes at least one of ferrite, magnetic iron nanomaterial, and carbonyl iron powder; the iron-based alloy includes at least one of iron-silicon-aluminum, iron-silicon, iron-nickel, iron-nickel-molybdenum, and iron-silicon-boron-copper-niobium.

4. The soft magnetic composite material according to claim 1, characterized in that: The adhesive is selected from any one of polyurethane, acrylic resin, nitrile rubber, vinyl acetate, polyvinyl alcohol resin, epoxy resin, silicone rubber, and fluororubber.

5. The soft magnetic composite material according to any one of claims 1 to 4, characterized in that: The soft magnetic composite material is selected from any one of a sheet material and a coil material.

6. The method for preparing the soft magnetic composite material according to any one of claims 1 to 5, characterized in that: The following steps are involved: The raw material components are mixed and vulcanized to obtain the soft magnetic composite material.

7. The method for preparing the soft magnetic composite material according to claim 6, characterized in that: The following steps are involved: (1) mixing the raw material components and coating them to obtain a film; or, mixing the raw material components and rolling them to obtain a sheet; (2) vulcanizing the single-layer membrane or single-layer sheet obtained in step (1) to obtain the soft magnetic composite material; or, calendering and vulcanizing the at least two-layer membrane or at least two-layer sheet obtained in step (1) to obtain the soft magnetic composite material; or, calendering and vulcanizing the at least one-layer membrane and at least one-layer sheet obtained in step (1) to obtain the soft magnetic composite material.

8. The preparation method according to claim 7, characterized in that: The vulcanization is selected from any one of calendering vulcanization and compression vulcanization.

9. An electronic smoking device, characterized in that: The soft magnetic composite material comprises the soft magnetic composite material as described in any one of claims 1 to 5.

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