Rubber magnet with self-repairing function and preparation method thereof

By introducing a self-healing agent into rubber magnetic materials and modifying the surface of magnetic powder, a dynamic chemical bond network is constructed, which solves the problem of self-healing failure of rubber magnets in highly filled systems. This achieves synergistic optimization of efficient self-healing and excellent magnetic properties, extending the product's service life.

CN122325859APending Publication Date: 2026-07-03BAOTOU INST MAGNETIC NEW MATERIALS CO LTD
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Patent Information

Application Number
CN202610797499.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-04
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing technologies cannot effectively solve the self-healing failure problem of rubber magnets in highly filled magnetic powder systems caused by spatial steric hindrance and interface defects. In particular, the risk of cracking is high in dynamic bending environments, and existing protection measures are passive and unsystematic.

Method used

By introducing a self-healing agent into rubber magnetic materials and using a coupling agent to modify the surface of the magnetic powder, combined with optimized material formulation and preparation process, a dynamic chemical bond network is constructed to achieve self-healing function.

Benefits of technology

Rubber magnetic materials maintain excellent magnetic properties while possessing efficient self-healing capabilities, with a repair rate of up to 92%, significantly extending their service life. Moreover, the preparation method is simple and feasible, making them suitable for large-scale industrial production.

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Abstract

The invention discloses a rubber magnet with a self-repairing function and a preparation method thereof. The preparation method comprises the following steps: S1, weighing the following components in parts by weight: 100 parts of rubber matrix; 150 to 400 parts of magnetic powder; 10-45 parts of a self-repairing agent; 2-5 parts of a vulcanizing agent; 1-2 parts of a vulcanizing aid; 1-6 parts of a coupling agent; 0.5-2 parts of an anti-aging agent; mixing and drying the magnetic powder and a coupling agent to obtain surface modified magnetic powder; s2, after the rubber matrix is plastified, a self-repairing agent and an anti-aging agent are added for mixing, a rubber mixture is obtained, and the self-repairing agent is selected from polysulfide rubber containing dynamic disulfide bonds, a compound of a carboxyl-containing natural rubber graft and ZnO or polyether thiourea glycol; s3, adding the modified magnetic powder into the rubber mixture for mixing, and then adding a vulcanizing agent and a vulcanizing aid for continuous mixing to obtain a rubber compound; and S4, carrying out vulcanization molding on the rubber compound. The rubber magnet has an efficient self-repairing function while keeping high magnetic performance.
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