Rubber magnet with self-repairing function and preparation method thereof

Abstract

This invention discloses a self-healing rubber magnet and its preparation method. The preparation method includes: S1, weighing the following components in parts by weight: 100 parts rubber matrix; 150-400 parts magnetic powder; 10-45 parts self-healing agent; 2-5 parts vulcanizing agent; 1-2 parts vulcanization auxiliaries; 1-6 parts coupling agent; 0.5-2 parts antioxidant; mixing and drying the magnetic powder and coupling agent to obtain surface-modified magnetic powder; S2, plasticizing the rubber matrix, then adding the self-healing agent and antioxidant and mixing to obtain a rubber mixture, wherein the self-healing agent is selected from polysulfide rubber containing dynamic disulfide bonds, a composite of natural rubber grafts containing carboxyl groups and ZnO, or polyether thiourea glycol; S3, adding the modified magnetic powder to the rubber mixture and mixing, then adding the vulcanizing agent and vulcanization auxiliaries and continuing to mix to obtain a compound; S4, vulcanizing and molding the compound. This rubber magnet maintains high magnetic properties while possessing a highly efficient self-healing function.

Description

Technical Field

[0001] This invention relates to the field of magnetic composite materials technology, and in particular to a self-healing rubber magnet and its preparation method. Background Technology

[0002] Rubber magnets are primarily used in static or low-bending environments, such as refrigerator magnets, toys, and magnetic clips for office whiteboards. The performance requirements for these products mainly focus on magnetic properties, dimensional stability, and low-cost processing, with cracking not being the primary failure mode. However, as rubber magnets are increasingly used in wearable and dynamically bending applications such as wireless magnetic rings and smartwatch straps, the risk of cracking has become a real engineering problem.

[0003] For the failure mode of rubber magnetic cracking, existing technologies mainly adopt physical isolation (coating / capping), adding rigid fillers (fibers / nanoparticles) for reinforcement, and microcapsules in low-filling systems. In essence, these are all passive protection or idealized repair, and none of them can systematically solve the fundamental contradiction of self-healing failure caused by spatial steric hindrance and interface defects in high-filling magnetic powder. Summary of the Invention

[0004] The purpose of this invention is to provide a rubber magnet with self-healing function. This rubber magnet not only has excellent magnetic and mechanical properties, but also has a highly efficient self-healing function, which can automatically restore its performance after damage and significantly extend its service life.

[0005] To achieve the above objectives, the solution of the present invention is: a method for preparing a self-healing rubber magnet, comprising the following steps: S1. Weigh the following components according to the following weight parts: 100 parts of rubber matrix; 150-400 parts of magnetic powder; 10-45 parts of self-healing agent; 2-5 parts of vulcanizing agent; 1-2 parts of vulcanizing aid; 1-6 parts of coupling agent; 0.5-2 parts of antioxidant; mix the magnetic powder and coupling agent evenly, and dry at 80-120℃ for 1-3 hours to obtain surface-modified magnetic powder; S2. Plasticize the rubber matrix at 40~80℃ for 5~10 minutes, then add the self-healing agent and antioxidant, and continue to mix for 10~30 minutes to obtain the rubber mixture; The self-healing agent is selected from any one of polysulfide rubber containing dynamic disulfide bonds, a composite of natural rubber graft containing carboxyl groups and ZnO, and polyether thiourea glycol. S3. Add the modified magnetic powder to the rubber mixture and mix at 50~70℃ for 15~30 minutes. Then add the vulcanizing agent and vulcanizing aid and continue mixing at 40~80℃ for 5~10 minutes to obtain the compound. S4. Prepare the compounded rubber into the desired product shape and place it in the corresponding vulcanization mold. Vulcanize it for 10-20 minutes at 140-160℃ and 10-15MPa to obtain a rubber magnet with self-healing function.

[0006] Preferably, the polysulfide rubber containing dynamic disulfide bonds is a reaction product obtained by reacting liquid polysulfide rubber with a dynamic disulfide bond initiator, wherein the dynamic disulfide bond initiator is 2,2'-dithiodiethanol or tetramethylthiuram disulfide.

[0007] Preferably, the carboxyl-containing natural rubber graft and ZnO composite is obtained by grafting natural rubber with unsaturated carboxylic acid under the action of a peroxide initiator, and then performing an ionic crosslinking reaction with nano-ZnO.

[0008] Preferably, the polyether thiourea glycol is prepared by reacting polyethylene glycol with diisocyanate and then using a chain extender containing thiourea groups.

[0009] Preferably, the rubber matrix is ​​at least one of nitrile rubber and natural rubber.

[0010] Preferably, the magnetic powder is at least one of neodymium iron boron magnetic powder, ferrite magnetic powder, and samarium iron nitrogen magnetic powder.

[0011] Preferably, the coupling agent is at least one of a silane coupling agent and a titanate coupling agent.

[0012] Preferably, the vulcanizing agent is a mixture of dicumyl peroxide and zinc acrylate in a ratio of 1:10; The vulcanization aid is at least one of accelerator CZ and accelerator DM.

[0013] Preferably, the antioxidant is antioxidant 4010NA.

[0014] The present invention also provides a self-healing rubber magnet, comprising the following components by weight: 100 parts of rubber matrix; Magnetic powder 150-400 parts; 10-45 parts of self-healing agent; 2-5 parts of vulcanizing agent; 1-2 parts of vulcanizing aid; 1-6 parts of coupling agent; Anti-aging agent 0.5-2 parts; The self-healing agent is selected from any one of polysulfide rubber containing dynamic disulfide bonds, a composite of natural rubber graft containing carboxyl groups and ZnO, and polyether thiourea glycol.

[0015] After adopting the above solution, the beneficial effects of the present invention are as follows: This invention introduces a self-healing agent into rubber magnetic materials, utilizing the reversible breakage and recombination of dynamic chemical bonds to achieve self-healing functionality. This effectively repairs cracks and damage generated during use, significantly extending product lifespan. Specifically: In view of what is generally known in the art, the addition of self-healing agents can lead to problems such as decreased magnetic powder dispersibility, deterioration of mechanical properties, and increased costs. This invention uses a coupling agent to modify the surface of the magnetic powder, improving the interfacial bonding between the magnetic powder and the rubber matrix, and enhancing the mechanical and magnetic properties of the material. Addressing the common concern among those skilled in the art that in highly filled rubber magnetic systems, molecular chains are anchored by a large amount of magnetic powder, hindering effective movement and preventing effective self-repair even with the addition of self-healing agents, this invention achieves synergistic optimization of magnetic properties, mechanical properties, and self-healing performance through material formulation and preparation process optimization. This enables the rubber magnetic material to maintain excellent magnetic properties while possessing highly efficient self-healing capabilities, achieving a repair rate of 92% and meeting magnetic performance standards. The preparation method of the present invention is simple and feasible, with controllable production costs, and is suitable for large-scale industrial production. Attached Figure Description

[0016] Figure 1 This is a flowchart of the rubber magnet preparation method of the present invention. Detailed Implementation

[0017] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] This invention provides a self-healing rubber magnet, comprising the following components by weight: 100 parts rubber matrix, 150-400 parts magnetic powder, 10-45 parts self-healing agent, 2-5 parts vulcanizing agent, 1-2 parts vulcanizing aid, 1-6 parts coupling agent, and 0.5-2 parts antioxidant.

[0019] The preparation method of this self-healing rubber magnet includes the following steps (see reference). Figure 1 ): S1. Mix the magnetic powder and coupling agent evenly, and dry at 80~120℃ for 1~3 hours to obtain surface-modified magnetic powder. The magnetic powder is at least one of neodymium iron boron magnetic powder, ferrite magnetic powder, and samarium iron nitrogen magnetic powder. The coupling agent is at least one of silane coupling agent and titanate coupling agent.

[0020] This step utilizes a coupling agent to modify the surface of the magnetic powder, forming an organic coating layer on the powder surface. This transforms the magnetic powder surface from hydrophilic to oleophilic, overcoming the interfacial defects caused by the natural incompatibility between the magnetic powder and the rubber matrix. Unmodified magnetic powder and rubber interfaces contain numerous microscopic voids that disrupt the self-healing network. After modification with the coupling agent, these interfacial defects are filled, and the organic matrix phase forms a continuous, uninterrupted matrix, providing unobstructed channels for the self-healing network. Simultaneously, the modified magnetic powder exhibits significantly improved dispersion uniformity, preventing agglomeration and providing a solid foundation for subsequent mixing and vulcanization.

[0021] S2. Add the rubber matrix to the internal mixer and plasticize at 40~80℃ for 5~10 minutes. Then add the self-healing agent and antioxidant and continue mixing for 10~30 minutes to obtain the rubber mixture.

[0022] The rubber matrix is ​​at least one of nitrile rubber and natural rubber.

[0023] The antioxidant is at least one of antioxidant RD, antioxidant MB, and antioxidant 4010NA.

[0024] The self-healing agent is selected from any one of the following: polysulfide rubber containing dynamic disulfide bonds, a composite of natural rubber graft containing carboxyl groups and ZnO, and polyether thiourea glycol.

[0025] The preparation methods of the various self-healing agents used in this invention are as follows: The preparation method of the polysulfide rubber containing dynamic disulfide bonds is as follows: take 100g of liquid polysulfide rubber (LP-3 type), dissolve it in an appropriate amount of tetrahydrofuran, add 5~10g of 2,2'-dithiodiethanol or tetramethylthiuram disulfide as a crosslinking / introducing agent, stir and react at 60°C for 4~6h, remove the solvent by rotary evaporation, and obtain polysulfide rubber containing dynamic disulfide bonds.

[0026] The self-healing principle of the polysulfide rubber containing dynamic disulfide bonds is based on the dynamic reversible exchange reaction of disulfide bonds (-SS-) in the polysulfide rubber molecular chain. When cracks occur in the material, under external stimuli such as heating or ultraviolet light irradiation, the broken disulfide bonds can recombine, thus healing the cracks.

[0027] The method for preparing the carboxyl-containing natural rubber graft and ZnO complex is as follows: 100 parts of natural rubber and 15-40 parts of unsaturated carboxylic acid (e.g., methacrylic acid) are mixed in a mixer, and a grafting reaction is carried out under the action of a peroxide initiator (e.g., benzoyl peroxide) to obtain carboxyl-grafted natural rubber; then 5-15 parts of nano-ZnO are added and mixed to allow the nano-ZnO to undergo an ionic crosslinking reaction with the carboxyl groups to obtain the carboxyl-containing natural rubber graft and ZnO complex.

[0028] The self-healing mechanism of the carboxyl-containing natural rubber graft and ZnO complex is based on ionic interactions in supramolecular chemistry. The carboxyl groups (-COOH) grafted onto the natural rubber react with ZnO to form an ionic cross-linked network (ZnO). 2+ With carboxylate ion -COO - (Coordination effect). These ionic bonds are dynamically reversible, allowing them to recombine after material damage, thus achieving repair.

[0029] The preparation method of the polyether thiourea ethylene glycol is as follows: polyethylene glycol is reacted with diisocyanate to generate an isocyanate-terminated prepolymer, and then a chain extender containing thiourea groups is added to extend the chain, finally obtaining a polyether thiourea ethylene glycol elastomer with thiourea bonds in the main chain.

[0030] The self-healing principle of the polyether thiourea glycol is based primarily on the dynamic hydrogen bonds formed between thiourea groups. Hydrogen bonds are a typical type of non-covalent bond that can reversibly break and recombine at room temperature, enabling the material to achieve autonomous self-healing without external stimulation.

[0031] S3. Add the modified magnetic powder obtained in step S2 to the rubber mixture obtained in step S3, and mix at 50~70℃ for 15~30 minutes. Then add the vulcanizing agent and vulcanizing aid, and continue mixing at 40~80℃ for 5~10 minutes to obtain the compound rubber.

[0032] The vulcanizing agent is a mixture of dicumyl peroxide (DCP) and zinc acrylate in a 1:10 ratio. DCP acts as an initiator, decomposing at high temperatures to generate free radicals, which initiate the polymerization of zinc acrylate and simultaneously promote carbon-carbon (CC) crosslinking between rubber molecular chains, providing the material with basic skeletal strength and heat resistance. Zinc acrylate, acting as a co-crosslinking agent, undergoes in-situ polymerization under the initiation of DCP, forming a polyacrylate ionic crosslinking network. This is a highly efficient physical crosslinking point independent of the rubber molecular chains. These two substances play different roles, achieving functional synergy and providing a stronger crosslinking effect by forming an independent network that does not interfere with the original dynamic bonds.

[0033] The vulcanization aid is at least one of accelerator CZ and accelerator DM. Accelerator CZ (N-cyclohexyl-2-benzothiazole sulfenamide) has the characteristics of good scorch safety and excellent vulcanization flatness; accelerator DM (dibenzothiazole disulfide) has good compatibility with the peroxide system and can improve crosslinking efficiency. The two can be used alone or in combination to regulate vulcanization characteristics and ensure uniform crosslinking reaction.

[0034] S4. Prepare the compounded rubber into the desired product shape and place it in the corresponding vulcanization mold. Vulcanize it for 10-20 minutes at 140-160℃ and 10-15MPa to obtain a rubber magnet with self-healing function.

[0035] In summary, this invention employs a pre-modification of magnetic powder followed by sequential mixing. First, a coupling agent is used to modify the surface of the magnetic powder, changing its hydrophilicity to oleophilicity, eliminating interfacial micro-voids, and providing a continuous and uninterrupted matrix channel for the self-healing network. Subsequently, a self-healing agent is added after rubber plasticizing, and finally, a vulcanizing agent is added for crosslinking. This sequential mixing process avoids premature participation of the self-healing agent in the crosslinking reaction or excessive adsorption by the magnetic powder, ensuring the uniform distribution and reversible nature of dynamic bonds in the rubber matrix.

[0036] The following experimental examples demonstrate the performance advantages of the self-healing rubber magnet of this invention. Experimental Example 1: The Influence of Self-Healing Agent Type and Content on the Magnetic Properties of Self-Healing Rubber

[0037] Example 1-1 This embodiment of the self-healing rubber magnet includes the following raw materials in parts by weight: 100 parts natural rubber, 230 parts neodymium iron boron magnetic powder, 35 parts polysulfide rubber containing dynamic disulfide bonds, 3.3 parts vulcanizing agent, 1.5 parts accelerator CZ, 3.5 parts silane coupling agent KH550, and 1 part antioxidant 4010NA.

[0038] The preparation method is as follows: (1) The neodymium iron boron magnetic powder was mixed evenly with the silane coupling agent KH550 and dried at 90°C for 2 hours to obtain the modified magnetic powder; (2) Add natural rubber to a mixer and plasticize at 60°C for 10 minutes. Then add polysulfide rubber containing dynamic disulfide bonds and antioxidant 4010NA, and continue mixing for 15 minutes to obtain a rubber mixture. (3) Add the modified magnetic powder to the rubber mixture and mix at 60°C for 20 minutes. Then add the vulcanizing agent and accelerator CZ and continue mixing at 60°C for 10 minutes to obtain the compound rubber. (4) Place the compounded rubber into a mold and vulcanize it for 20 minutes at 150°C and 10MPa to obtain a rubber magnet with self-healing function.

[0039] Examples 1-2 The self-healing rubber magnet in this embodiment differs from that in Example 1-1 in that the self-healing agent uses 35 parts of a composite of carboxyl-containing natural rubber graft and ZnO, while the other raw materials and preparation methods are the same.

[0040] Examples 1-3 The self-healing rubber magnet in this embodiment differs from that in Example 1-1 in that the self-healing agent is 35 parts of polyether thiourea glycol, while the other raw materials and preparation methods are the same.

[0041] Examples 1-4 The self-healing rubber magnet in this embodiment differs from those in Examples 1-2 in that the carboxyl-containing natural rubber graft and ZnO composite in the self-healing agent is reduced to 10 parts, while the other raw materials and preparation methods remain the same.

[0042] Examples 1-5 The self-healing rubber magnet in this embodiment differs from those in Examples 1-2 in that the self-healing agent, a composite of carboxyl-containing natural rubber graft and ZnO, is increased to 45 parts, while the other raw materials and preparation methods remain the same.

[0043] Comparative Example 1-1 The difference between this comparative rubber magnet and Examples 1-2 is that the self-healing agent containing carboxyl-containing natural rubber grafts and ZnO composite is reduced to 5 parts, while the other raw materials and preparation methods are the same.

[0044] Comparative Examples 1-2 The difference between this comparative rubber magnet and Examples 1-2 is that the self-healing agent containing carboxyl-containing natural rubber grafts and ZnO composite is reduced to 50 parts, while the other raw materials and preparation methods are the same.

[0045]

[0046] The performance test structures for each embodiment and comparative example in this experiment are shown in Table 1-2: Comparing Examples 1-1 to 1-3, it can be seen that all three self-healing agents provided in this application can achieve efficient self-healing (efficiency 84%-92%). Among them, the composite of carboxyl-containing natural rubber graft and ZnO (Example 1-2) has the best overall performance (tensile strength 14.2 MPa, self-healing efficiency 92%).

[0047] Comparing Examples 1-2 with Comparative Examples 1-1 and 1-2, it can be seen that insufficient self-healing agent (Comparative Example 1-1) leads to a reduction in the number of dynamic bonds, discontinuity in the dynamic network, and a significant decrease in self-healing efficiency. Simultaneously, the mechanical properties of the material (especially toughness) are also reduced. Conversely, excessive addition of self-healing agent (Comparative Example 1-2) over-dilutes the main network, significantly reducing the original mechanical strength and magnetism of the material, and resulting in a decrease in self-healing efficiency. Experimental Example 2: The Effect of the Ratio of Magnetic Powder to Rubber Matrix on the Magnetic Properties of Rubber

[0048] Example 2-1 The rubber magnet with self-healing function in this embodiment differs from those in Examples 1-2 in that the amount of neodymium iron boron magnetic powder is reduced to 150 parts, while the other raw materials and preparation methods are the same.

[0049] Example 2-2 The self-healing rubber magnet in this embodiment differs from those in Examples 1-2 in that it contains 60 parts of nitrile rubber, 40 parts of natural rubber, and 400 parts of neodymium iron boron magnetic powder. The remaining raw materials and preparation methods are the same.

[0050] Example 2-3 The self-healing rubber magnet in this embodiment differs from those in Examples 1-2 in that the magnetic powder used is ferrite magnetic powder, while the other raw materials and preparation methods are the same.

[0051] Examples 2-4 The self-healing rubber magnet in this embodiment differs from those in Examples 1-2 in that the magnetic powder used is samarium iron nitrogen magnetic powder, while the other raw materials and preparation methods are the same.

[0052] Comparative Example 2-1 The difference between this comparative rubber magnet and Examples 1-2 is that the amount of neodymium iron boron magnetic powder is reduced to 50 parts, while the other raw materials and preparation methods are the same.

[0053] Comparative Example 2-2 The difference between this comparative rubber magnet and Examples 1-2 is that the amount of neodymium iron boron magnetic powder is increased to 900 parts, while the other raw materials and preparation methods are the same.

[0054]

[0055] The performance test structures for each embodiment and comparative example in this experiment are shown in Table 2-2: As shown in Table 2-2, low magnetic powder content (Comparative Example 2-1) has no significant adverse effect on self-healing performance, but the magnetic properties are significantly lower than the practical standard. As the proportion of magnetic powder increases, the remanence and other magnetic properties of the rubber continue to improve. However, excessive magnetic powder (Comparative Example 2-2) disrupts the continuity of the rubber and hinders dynamic bond recombination. The self-healing efficiency drops from 92% to 23%, indicating that excessive magnetic powder has an adverse effect on self-healing performance.

[0056] Comparing Examples 1-2, 2-3, and 2-4, it can be seen that the self-healing agent of the present invention (a complex of natural rubber graft containing carboxyl groups and ZnO) can function in all three magnetic powder systems and has good magnetic powder compatibility.

[0057] Experimental Example 3: The Effect of Coupling Agent Content on the Magnetic Properties of Rubber

[0058] Example 3-1 The self-healing rubber magnet in this embodiment differs from those in Examples 1-2 in that the coupling agent used is 3.5 parts of titanate coupling agent NDZ-201, while the other raw materials and preparation methods are the same.

[0059] Example 3-2 The self-healing rubber magnet in this embodiment differs from those in Examples 1-2 in that the silane coupling agent KH550 is reduced to 1.5 parts, while the other raw materials and preparation methods remain the same.

[0060] Comparative Example 3-1 The difference between this comparative rubber magnet and Examples 1-2 is that the silane coupling agent KH550 is reduced to 0.5 parts, while the other raw materials and preparation methods are the same.

[0061] Comparative Example 3-2 The difference between this comparative rubber magnet and Examples 1-2 is that the silane coupling agent KH550 is increased to 8 parts, while the other raw materials and preparation methods are the same.

[0062]

[0063] The performance test structures for each embodiment and comparative example in this experiment are shown in Table 3-2: As can be seen from Table 3-2, the coupling agent can modify the surface of the magnetic powder, improve the interfacial bonding force between the magnetic powder and the rubber matrix, and enhance the mechanical and magnetic properties of the material.

[0064] When the amount of coupling agent is insufficient (Comparative Example 3-1), the interface defects are not completely filled, the self-healing network is broken, which significantly reduces the mechanical properties and self-healing efficiency of the material, but has no significant effect on the macroscopic magnetic properties. However, when an excessive amount of coupling agent is added (Comparative Example 3-2), the excessively thick interface layer hinders the smooth flow of the dynamic bond network, which significantly reduces the original tensile strength of the material, while increasing the elongation at break (indicating that the material becomes softer), and the self-healing efficiency also decreases.

[0065] The above experimental examples demonstrate that the present invention, through modification of magnetic powder surface coupling agent, construction of rubber-self-healing agent dual network, control of magnetic powder dosage, and optimization of sequential mixing process, prepares a material with excellent magnetic and mechanical properties, as well as efficient self-healing function, which can automatically restore performance after damage and significantly extend service life.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the design of this case. All equivalent changes made based on the key design features of this case shall fall within the protection scope of this case.

Claims

1. A method for preparing a self-healing rubber magnet, characterized in that, Includes the following steps: S1. Weigh each component according to the following parts by weight: 100 parts rubber matrix; 150-400 parts magnetic powder; 10-45 parts self-healing agent; 2-5 parts vulcanizing agent; 1-2 parts vulcanizing aid; 1-6 parts coupling agent; 0.5-2 parts antioxidant. The magnetic powder and coupling agent are mixed evenly and dried at 80~120℃ for 1~3 hours to obtain surface-modified magnetic powder. S2. Plasticize the rubber matrix at 40~80℃ for 5~10 minutes, then add the self-healing agent and antioxidant, and continue to mix for 10~30 minutes to obtain the rubber mixture; The self-healing agent is selected from any one of polysulfide rubber containing dynamic disulfide bonds, a composite of natural rubber graft containing carboxyl groups and ZnO, and polyether thiourea glycol. S3. Add the modified magnetic powder to the rubber mixture and mix at 50~70℃ for 15~30 minutes. Then add the vulcanizing agent and vulcanizing aid and continue mixing at 40~80℃ for 5~10 minutes to obtain the compound. S4. Prepare the compounded rubber into the desired product shape, place it in the corresponding vulcanization mold, and vulcanize it for 10-20 minutes at 140-160℃ and 10-15MPa to obtain a rubber magnet with self-healing function.

2. The method for preparing a self-healing rubber magnet as described in claim 1, characterized in that: The polysulfide rubber containing dynamic disulfide bonds is a reaction product obtained by reacting liquid polysulfide rubber with a dynamic disulfide bond initiator, wherein the dynamic disulfide bond initiator is 2,2'-dithiodiethanol or tetramethylthiuram disulfide.

3. The method for preparing a self-healing rubber magnet as described in claim 1, characterized in that: The carboxyl-containing natural rubber graft and ZnO complex is obtained by grafting natural rubber with unsaturated carboxylic acid under the action of a peroxide initiator, and then carrying out an ionic crosslinking reaction with nano-ZnO.

4. The method for preparing a self-healing rubber magnet as described in claim 1, characterized in that: The polyether thiourea glycol is prepared by reacting polyethylene glycol with diisocyanate and then using a chain extender containing thiourea groups.

5. The method for preparing a self-healing rubber magnet as described in claim 1, characterized in that: The rubber matrix is ​​at least one of nitrile rubber and natural rubber.

6. The method for preparing a self-healing rubber magnet as described in claim 1, characterized in that: The magnetic powder is at least one of neodymium iron boron magnetic powder, ferrite magnetic powder, and samarium iron nitrogen magnetic powder.

7. The method for preparing a self-healing rubber magnet as described in claim 1, characterized in that: The coupling agent is at least one of a silane coupling agent and a titanate coupling agent.

8. The method for preparing a self-healing rubber magnet as described in claim 1, characterized in that: The vulcanizing agent is a mixture of dicumyl peroxide and zinc acrylate in a 1:10 ratio. The vulcanization aid is at least one of accelerator CZ and accelerator DM.

9. The method for preparing a self-healing rubber magnet as described in claim 1, characterized in that: The antioxidant is antioxidant 4010NA.

10. A rubber magnet with self-healing function, characterized in that, The following components are included in parts by weight: 100 parts of rubber matrix; Magnetic powder 150-400 parts; 10-45 parts of self-healing agent; 2-5 parts of vulcanizing agent; 1-2 parts of vulcanizing aid; 1-6 parts of coupling agent; Anti-aging agent 0.5-2 parts; The self-healing agent is selected from any one of polysulfide rubber containing dynamic disulfide bonds, a composite of natural rubber graft containing carboxyl groups and ZnO, and polyether thiourea glycol.

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