Magnetic material with high elasticity and heat resistance and preparation method thereof

Abstract

The invention discloses a magnetic material with high elasticity and heat resistance and a preparation method thereof, and belongs to the field of magnetic material preparation, the magnetic material comprises 60-90 parts by weight of magnetic powder, 5-20 parts by weight of thermoplastic ethylene propylene rubber, 2-9 parts by weight of thermoplastic resin, 2-10 parts by weight of a plasticizing compatilizer, and 0.1-1 part by weight of a lubricant. The magnetic material can resist heat of 150 DEG C or above, is convenient for extrusion molding or injection molding, and is also convenient for encapsulation treatment.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic material preparation, and in particular to a magnetic material with high elasticity and heat resistance and a preparation method thereof. Background Art

[0002] Thermoplastic elastomer (TPE), also known as artificial rubber or synthetic rubber, has the physical and mechanical properties of vulcanized rubber and the processing properties of thermoplastic plastics. It is a new type of polymer material between rubber and resin. TPE material is a composite material made of SEBS or SIS materials and POE and other materials. The softening point of TPE is at a high temperature of 80 to 120°C. TPE will reach its Vicat softening point, at which time all the properties of the material will decrease, including hardness and toughness. The actual use temperature is around 90°C.

[0003] TPE magnetic data cable is a popular magnetic material. The material is generally made of TPE plastic mixed with samarium iron nitrogen or other magnetic powder to obtain the raw material for the production of magnetic data cable. For example, Chinese patent CN113674921A discloses a method for making a magnetic data cable. The scheme does not clearly claim what kind of adhesive material, but only lists TPU thermoplastic polyurethane as an example. TPU material does not have heat resistance without special modification. On the contrary, due to its high fluidity, it has a lower heat resistance temperature. For example, the glass transition temperature of polyether TPU is 100.6-106.1℃, and the glass transition temperature of polyester is 108.9~122.8℃. Therefore, the material does not have the requirement of heat resistance exceeding 150℃. Chinese patent CN118711928A discloses a flame-retardant magnetic data cable scheme with SEBS as the base material. This solution uses TPE based on SEBS, plus NdFeB magnetic powder, flame retardants, lubricants and anti-aging agents. Since it is TPE based on SEBS, the polymer chains in TPE will be decomposed or cross-linked under the action of heat at high temperatures. This change in chemical structure will cause the flexibility and ductility of the material to decrease, making it harder and brittle. High temperature environment will also accelerate the reaction of TPE with oxygen, forming hydroperoxides and further decomposing into compounds such as carbonyl. These reactions will destroy the chemical structure of the material, resulting in performance degradation, and analysis shows that it does not have heat resistance.

[0004] In order to better adapt to the application of magnetic data cables and obtain a more beautiful appearance, a layer of color coating needs to be added to the outside of the magnetic data cables. Due to the high content of magnetic powder (>80wt%), it is difficult to obtain the desired color by adding pigments or masterbatches. PE and TPU are base materials that do not have heat resistance, which is not conducive to the encapsulation of magnetic materials at high temperatures.

[0005] Therefore, how to provide a magnetic material that is suitable for extrusion molding or injection molding, but can withstand high temperatures of 150°C and is convenient for coating and encapsulation is a problem that needs to be solved.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a magnetic material with high elasticity and heat resistance and a preparation method thereof, which can achieve a heat resistance of more than 150°C and is convenient for extrusion molding or injection molding and encapsulation treatment, thereby solving the above-mentioned technical problems existing in the prior art.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] A magnetic material with high elasticity and heat resistance, comprising:

[0010]

[0011] A method for preparing the magnetic material with high elasticity and heat resistance according to the present invention comprises the following steps:

[0012] According to the formula of the present invention, various raw materials of magnetic materials with high elasticity and heat resistance are taken;

[0013] Preparation of adhesive: mixing a compatibilizer, a thermal property resin and a thermoplastic ethylene propylene rubber together to form an adhesive for magnetic materials;

[0014] The prepared adhesive is mixed with magnetic powder and lubricant, and mixed and extruded in a single-screw or twin-screw extruder to obtain a linear magnetic material, sheet magnetic material or tubular magnetic material of required specifications and sizes that does not melt when baked at a high temperature of 150-160°C for 10-60 minutes.

[0015] Compared with the prior art, the magnetic material with high elasticity and heat resistance, the preparation method and the magnetic wire provided by the present invention have the following beneficial effects:

[0016] Due to the use of heat-resistant substrate thermoplastic ethylene-propylene rubber and thermoplastic resin with good heat resistance, plasticizing compatibilizer uses high molecular weight material and highly hydrogenated material, also possesses good heat resistance, while plasticizer does not use mineral oil and white oil, but uses polyisoprene liquid rubber as plasticizer, on the one hand, avoids the precipitation of white oil or mineral oil as plasticizer, on the other hand, rubber itself also possesses good high temperature resistance, plasticizing compatibilizer guarantees heat resistance from its own characteristics and plasticizing characteristics, the overall heat resistance of three main substrates is improved and its comprehensive effect, so that the overall heat resistance of the material is improved. In addition, plasticizing compatibilizer and polyisoprene rubber plasticizing province are conducive to improving the elasticity of the material, plasticizing compatibilizer is in modified thermoplastic resin, and the fluidity is conducive to improving processing performance, and thermoplastic ethylene-propylene rubber also possesses good elasticity, so the material has both heat resistance and high elasticity. The magnetic material obtained by mixing heat-resistant plastic substrate and magnetic powder in the present invention can be a wire, sheet or wire protective cover with magnetic adsorption effect. DETAILED DESCRIPTION

[0017] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in combination with the specific content of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, which does not constitute a limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0018] First, the terms that may be used in this article are explained as follows:

[0019] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0020] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0021] The term "consisting of..." means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim closed, so that it does not contain technical feature elements other than the technical feature elements explicitly listed, except for the conventional impurities related to them. If this term only appears in a clause of a claim, it only limits the elements explicitly listed in the clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0022] The term "parts by mass" refers to the mass ratio relationship between multiple components. For example, if it is described that component X is x parts by mass and component Y is y parts by mass, then the mass ratio of component X to component Y is x:y. 1 part by mass can represent any mass, for example, 1 part by mass can be represented as 1 kg or 3.1415926 kg. The sum of the parts by mass of all components is not necessarily 100 parts, but can be greater than 100 parts, less than 100 parts or equal to 100 parts. Unless otherwise specified, the parts, proportions and percentages described herein are all measured by mass.

[0023] Unless otherwise specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0024] The orientation or position relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown and are only for the convenience of description and simplification of description, and do not explicitly or implicitly indicate that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation of this document.

[0025] The scheme provided by the present invention is described in detail below. The contents not described in detail in the embodiments of the present invention belong to the prior art known to professionals in the field. If the specific conditions are not specified in the embodiments of the present invention, they are carried out according to the conventional conditions in the field or the conditions recommended by the manufacturer. If the manufacturers are not specified in the reagents or instruments used in the embodiments of the present invention, they are all conventional products that can be purchased commercially.

[0026] The embodiment of the present invention provides a magnetic material with high elasticity and heat resistance, including:

[0027]

[0028] Preferably, in the above magnetic material, the magnetic powder is samarium iron nitrogen magnetic powder and / or neodymium iron boron magnetic powder.

[0029] The samarium iron nitrogen magnetic powder adopts 2:17 phase or 1:9 phase samarium iron nitrogen magnetic powder with a median diameter D50 of 10 to 60 μm;

[0030] The NdFeB magnetic powder has a median diameter D50 of 10 to 60 um.

[0031] Preferably, in the magnetic material, the compatibilizer is a mixed powder formed by plasticizing SEBS with polyisoprene rubber, wherein the amount of SEBS is 20 to 80 parts by weight and the amount of polyisoprene rubber is 20 to 80 parts by weight.

[0032] Preferably, in the above magnetic material, the SEBS is SEBS with a molecular weight of more than 150,000 and / or hydrogenated SEBS;

[0033] The polyisoprene rubber is used as a plasticizer, and liquid polyisoprene rubber with a weight average molecular weight of 10,000 to 60,000 is used.

[0034] Preferably, in the above magnetic material, the compatibilizer is prepared in the following manner, including:

[0035] SEBS and polyisoprene rubber are plasticized in a mixer at a mixing temperature of 40 to 80° C. for 3 to 5 hours. The mixed powder obtained after mixing is the plasticizing compatibilizer.

[0036] Preferably, in the magnetic material, the compatibilizer, the thermoplastic resin and the thermoplastic ethylene-propylene rubber are made into an adhesive in the following manner, including:

[0037] The compatibilizer, thermoplastic plastic and thermoplastic EPDM rubber are mixed together to form a binder for the magnetic material.

[0038] Preferably, in the above magnetic material, the hardness of the thermoplastic ethylene-propylene rubber is 20 to 70 shA.

[0039] Preferably, in the above magnetic material, the lubricant is boron nitride powder.

[0040] The present invention also provides a method for preparing the above-mentioned magnetic material with high elasticity and heat resistance, comprising the following steps:

[0041] According to the above formula, various raw materials of magnetic materials with high elasticity and heat resistance are taken;

[0042] Preparation of adhesive: mixing plasticizing compatibilizer, thermoplastic resin and thermoplastic ethylene-propylene rubber together to form an adhesive for magnetic materials;

[0043] The prepared adhesive is mixed with magnetic powder and lubricant, and mixed and extruded in a single-screw or twin-screw extruder to obtain a linear magnetic material, sheet magnetic material or tubular magnetic material of required specifications and sizes that does not melt when baked at a high temperature of 150-160°C for 10-60 minutes.

[0044] Preferably, in the above method, the plasticizing compatibilizer is prepared in the following manner, including:

[0045] 20 to 80 parts by weight of SEBS and 20 to 80 parts by weight of polyisoprene rubber are mixed and plasticized in a mixer at a mixing temperature of 40 to 80° C. for 3 to 5 hours. The mixed powder obtained after mixing is the plasticizing compatibilizer.

[0046] In summary, the magnetic material of the embodiment of the present invention adopts a heat-resistant substrate thermoplastic ethylene-propylene rubber and a polyphenylene ether with good heat resistance, and the SEBS (SEBS is a linear triblock copolymer with polystyrene as the terminal segment and ethylene-butene copolymer obtained by hydrogenating polybutadiene as the middle elastic block, and its full English name is Styrene Ethylene Butylene Styrene, referred to as SEBS) in the plasticizer compatibilizer adopts a high molecular weight material and a highly hydrogenated material, and also has good heat resistance. At the same time, the plasticizer does not use mineral oil and white oil, but uses polyisoprene liquid rubber as a plasticizer. On the one hand, the precipitation of white oil or mineral oil as a plasticizer is avoided, and on the other hand, the rubber itself also has good high temperature resistance. SESB ensures heat resistance from its own characteristics and plasticization characteristics. The overall heat resistance of the three main substrates is improved and their combined effect improves the overall heat resistance of the material. In addition, SEBS and polyisoprene rubber plasticization are beneficial to improve the elasticity of the material. The plasticized SEBS is used as a compatibilizer to modify the fluidity of thermoplastic resins such as PPO (PPO, English Polyphenylene Oxide) or PPE (English: Polypheylene ether, Chinese name is polyphenylene ether) and is beneficial to improve processing performance. Thermoplastic ethylene propylene rubber also has good elasticity, so the material has both heat resistance and high elasticity. The magnetic material prepared by mixing the heat-resistant plastic substrate and the magnetic powder in the present invention can be a wire, sheet or wire protective cover with magnetic adsorption. By using thermoplastic EPDM, compared with SEBS or TPU substrate, the problem of insufficient heat resistance is solved. Compared with silicone substrate, the problem of high cost due to vulcanization is solved, and the poor filling of silicone makes it difficult to obtain magnetic materials with high performance. By adding polyphenylene ether, the mechanical properties, water resistance, heat resistance and flexibility of the polymer can be improved. With the plasticizing compatibilizer, it plays the dual role of compatibilizer and fluidity regulator. The two are compatible, which makes up for the characteristics of good heat resistance but slightly poor fluidity of polyphenylene ether. Due to the microscopic phase morphology of thermoplastic vulcanized EPDM prepared by dynamic full vulcanization technology, during the melt blending process, the highly vulcanized cross-linked rubber phase is sheared into 1-5μm fine particles dispersed in the polyolefin matrix to form a dispersed phase, which has nothing to do with the amount of rubber phase. The micro-regions of the rubber and plastic phases are both separated and have a certain connection form, which makes it have many superior properties. The heat-resistant temperature of thermoplastic EPDM can be above 150℃.

[0047] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the solution provided by the embodiment of the present invention is described in detail with specific embodiments below.

[0048] Embodiment 1:

[0049] The present invention provides a magnetic material with high elasticity and heat resistance, which is a magnetic material capable of withstanding heat of more than 150 degrees, comprising:

[0050]

[0051] Furthermore, in the above-mentioned magnetic material, the magnetic powder adopts samarium iron nitride magnetic powder or neodymium iron boron magnetic powder, or a composite magnetic powder mixed with the two; wherein the samarium iron nitride magnetic powder adopts 2:17 phase or 1:9 phase samarium iron nitride magnetic powder with a median diameter D50 of 10-60um, and the neodymium iron boron magnetic powder adopts neodymium iron boron magnetic powder with a median diameter D50 of 10~60um.

[0052] Furthermore, in the magnetic material, the plasticizing compatibilizer is a mixed powder formed by plasticizing SEBS with polyisoprene rubber, wherein SEBS is 20 to 80 parts by weight and polyisoprene rubber (PI) is 20 to 80 parts by weight.

[0053] To obtain a high temperature resistant and highly elastic material, SEBS is preferably SEBS with a molecular weight of more than 150,000 or hydrogenated SEBS (HN-SEBS), or a combination thereof. Rubber-type liquid polyisoprene rubber is used as a plasticizer, and the liquid polyisoprene rubber is preferably liquid polyisoprene rubber with a weight average molecular weight of 10,000-60,000.

[0054] 20 to 80 parts by weight of SEBS and polyisoprene rubber (PI) are plasticized in a mixer at a mixing temperature of 40 to 80° C. for 3 to 5 hours to obtain a plasticized compatibilizer.

[0055] The plasticizing compatibilizer, thermoplastic resin and thermoplastic EPDM rubber are mixed together to form an adhesive for magnetic materials.

[0056] Furthermore, in the above magnetic material, the thermoplastic resin is polyphenylene ether PPO or polyether ester elastomer TPEE.

[0057] Furthermore, in the above magnetic material, the hardness of the thermoplastic ethylene-propylene rubber is 20 to 70 shA.

[0058] Furthermore, in the above magnetic material, the lubricant is preferably boron nitride powder.

[0059] The magnetic material is prepared in the following manner, including:

[0060] First, prepare a plasticizing compatibilizer: plasticize 20 to 80 parts by weight of SEBS and 20 to 80 parts by weight of polyisoprene rubber in a mixer at a mixing temperature of 40 to 80° C. for 3 to 5 hours, and obtain a mixed powder which is the plasticizing compatibilizer;

[0061] Prepare the adhesive: mix the plasticizer, thermoplastic resin and thermoplastic EPDM rubber together to form the adhesive for magnetic materials.

[0062] Finally, the magnetic material is prepared: the prepared adhesive and magnetic powder are mixed together, and mixed and extruded in a single-screw or twin-screw extruder to obtain the required linear magnetic material, sheet magnetic material or tubular magnetic material of different specifications and sizes. The obtained linear magnetic material does not melt when baked at a high temperature of 150 to 160°C for 10 to 60 minutes.

[0063] Embodiment 2:

[0064] This embodiment provides a magnetic material with high elasticity and heat resistance, and the preparation method thereof is as follows, comprising:

[0065] First, prepare a plasticizing compatibilizer: plasticize 40 parts by weight of SEBS and 60 parts by weight of polyisoprene rubber PI in a mixer at 80° C. for 3 hours to obtain a plasticized SEBS compatibilizer powder, which is the plasticizing compatibilizer;

[0066] Then prepare the adhesive: 3 parts by weight of a plasticizer, 9 parts by weight of a thermoplastic ethylene-propylene rubber and 2.8 parts by weight of polyphenylene ether (PPO) are mixed together to prepare the adhesive;

[0067] Finally, the magnetic material is prepared: 85 parts by weight of Beijing Samarium Yuan's ST1015 samarium iron nitrogen magnetic powder in a ratio of 2:17 and 0.2 parts by weight of the above-prepared binder and boron carbide as a lubricant are selected, and granulated in a twin-screw extruder to obtain extruded particles with a particle size of 1 to 10 mm. The extruded particles are then formed into linear magnetic materials on the extruder. The product test shows that the heat resistance effect can reach 150°C and be baked for 40 minutes.

[0068] Embodiment 3:

[0069] This embodiment provides a magnetic material with high elasticity and heat resistance, and the preparation method thereof is as follows, comprising:

[0070] First, prepare a plasticizing compatibilizer: plasticize 40 parts by weight of SEBS and 60 parts by weight of polyisoprene rubber PI in a mixer at 80° C. for 3 hours to obtain a plasticized SEBS compatibilizer powder, which is the plasticizing compatibilizer;

[0071] Then prepare the adhesive: 4 parts by weight of a plasticizer, 12 parts by weight of a thermoplastic ethylene-propylene rubber and 4 parts by weight of polyphenylene ether (PPO) are mixed together to prepare the adhesive;

[0072] Finally, the magnetic material is prepared: 80 parts by weight of 1:9 phase samarium iron nitrogen magnetic powder with D50 = 50-60um is selected and mixed with the above-prepared binder and 0.2 parts by weight of boron carbide as a lubricant. After mixing in an internal mixer, the magnetic material is formed into sheets or strips in a single-screw extruder. The product test shows that it can achieve a short-term heat resistance of 160 degrees for 10 minutes.

[0073] Embodiment 4:

[0074] This embodiment provides a magnetic material with high elasticity and heat resistance, and the preparation method thereof is as follows, comprising:

[0075] First, prepare a plasticizing compatibilizer: plasticize 20 parts by weight of SEBS and 80 parts by weight of polyisoprene rubber PI in a mixer at 60° C. for 5 hours to obtain a plasticized SEBS compatibilizer powder, which is the plasticizing compatibilizer;

[0076] Then prepare the adhesive: 6 parts by weight of a plasticizer, 14.7 parts by weight of a thermoplastic ethylene-propylene rubber and 4 parts by weight of polyphenylene ether (PPO) are mixed together to prepare the adhesive;

[0077] Finally, prepare the magnetic material: select 80 parts by weight of magnetic powder of isotropic or anisotropic samarium iron nitrogen with a phase ratio of 2:17, mix with the above-prepared binder and 0.3 parts by weight of boron carbide as a lubricant, mix in an internal mixer and form strip-shaped magnetic material in a single-screw extruder. The product test can achieve a heat resistance effect of 150°C for 30 minutes. The product has good elasticity. When the anisotropic samarium iron nitrogen is extruded, a magnetic orientation field is added to the mold to obtain a high-performance, high-elasticity heat-resistant extruded magnetic strip.

[0078] Embodiment 5:

[0079] This embodiment provides a magnetic material with high elasticity and heat resistance, and the preparation method thereof is as follows, comprising:

[0080] First, prepare a plasticizing compatibilizer: 20 parts by weight of SEBS HY-604 and 80 parts by weight of polyisoprene rubber PI (molecular weight 30,000) are plasticized in a mixer at 60° C. for 5 hours to obtain a plasticized SEBS compatibilizer powder, which is the plasticizing compatibilizer;

[0081] Then prepare the adhesive: 2 parts by weight of a plasticizer, 8 parts by weight of a thermoplastic ethylene-propylene rubber and 2 parts by weight of polyphenylene ether (PPO) are mixed together to prepare the adhesive;

[0082] Finally, the magnetic material was prepared by selecting 88 parts by weight of samarium iron nitrogen magnetic powder with a D50 of 10-15 um in a 2:17 phase, the binder prepared above, and 0.1 parts by weight of boron carbide as a lubricant, mixing them in an internal mixer and then forming a tubular magnetic material in a single screw extruder. The product test showed that it could withstand heat at 150°C for more than 60 minutes in a short time. The product had good elasticity.

[0083] The magnetic material obtained by mixing the heat-resistant plastic substrate and the magnetic powder can be a wire magnetic material, a sheet magnetic material or a tube magnetic material with magnetic adsorption effect, and the tube magnetic material can be used as a magnetic protective cover.

[0084] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A magnetic material with high elasticity and heat resistance, characterized in that, include:

2. The highly elastic and heat-resistant magnetic material according to claim 1, characterized in that: The magnetic powder is made of samarium iron nitrogen magnetic powder and / or neodymium iron boron magnetic powder The samarium iron nitrogen magnetic powder adopts 2:17 phase or 1:9 phase samarium iron nitrogen magnetic powder with a median diameter D50 of 10 to 60 μm; The NdFeB magnetic powder has a median diameter D50 of 10 to 60 um.

3. The magnetic material with high elasticity and heat resistance according to claim 1 or 2, characterized in that: The compatibilizer is a mixed powder formed by plasticizing SEBS with polyisoprene rubber, wherein the amount of SEBS is 20 to 80 parts by weight and the amount of polyisoprene rubber is 20 to 80 parts by weight.

4. The magnetic material with high elasticity and heat resistance according to claim 3, characterized in that: The SEBS is SEBS with a molecular weight of more than 150,000 and / or hydrogenated SEBS; The polyisoprene rubber is used as a plasticizer, and liquid polyisoprene rubber with a weight average molecular weight of 10,000 to 60,000 is used.

5. The magnetic material with high elasticity and heat resistance according to claim 3, characterized in that: The plasticizing compatibilizer is prepared in the following manner, including: SEBS and polyisoprene rubber are plasticized in a mixer at a mixing temperature of 40 to 80° C. for 3 to 5 hours. The mixed powder obtained after mixing is the plasticizing compatibilizer.

6. The magnetic material with high elasticity and heat resistance according to claim 1, characterized in that: The thermoplastic resin is polyphenylene ether plastic or polyether ester elastomer plastic.

7. The magnetic material with high elasticity and heat resistance according to claim 1 or 6, characterized in that: The plasticizing compatibilizer, thermoplastic resin and thermoplastic ethylene-propylene rubber are prepared into an adhesive in the following manner, including: The plasticizing compatibilizer, the thermoplastic resin and the thermoplastic ethylene-propylene rubber are mixed together to form the adhesive for the magnetic material.

8. The magnetic material with high elasticity and heat resistance according to claim 1 or 2, characterized in that: The hardness of the thermoplastic ethylene-propylene rubber is 20 to 70 shA; The lubricant is boron nitride powder.

9. A method for preparing a magnetic material with high elasticity and heat resistance as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: Take the raw materials of the magnetic material with high elasticity and heat resistance according to the formula described in any one of claims 1 to 8; Preparation of adhesive: mixing plasticizing compatibilizer, thermoplastic resin and thermoplastic ethylene-propylene rubber together to form an adhesive for magnetic materials; The prepared adhesive is mixed with magnetic powder and lubricant, and mixed and extruded in a single-screw or twin-screw extruder to obtain a linear magnetic material, sheet magnetic material or tubular magnetic material of required specifications and sizes that does not melt when baked at a high temperature of 150-160°C for 10-60 minutes.

10. The method for preparing a magnetic material with high elasticity and heat resistance according to claim 9, characterized in that: The plasticizing compatibilizer is prepared in the following manner, including: 20 to 80 parts by weight of SEBS and 20 to 80 parts by weight of polyisoprene rubber are mixed and plasticized in a mixer at a mixing temperature of 40 to 80° C. for 3 to 5 hours. The mixed powder obtained after mixing is the plasticizing compatibilizer.

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