Magnetic grease and preparation method thereof

By using benzyl silicone oil as the base carrier liquid in the magnetic grease, nanomagnetic particles modified by hydrocarbon substances with polar groups, micron magnetic particles coated with silica modified by epoxy modified silicone oil and hydrogen-containing silicone oil, combined with the cross-linking and curing reaction of vinyl silicone oil, the problems of uneven dispersion of magnet grease and stability in the radiation environment are solved, and efficient and reliable magnetic medium sealing effect is achieved.

CN120072440AActive Publication Date: 2025-05-30TSINGHUA UNIVERSITY
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Patent Information

Application Number
CN202510544136.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-28
Publication Date
2025-05-30
Estimated Expiration
2045-04-28

AI Technical Summary

Technical Problem

The existing magnetic greases are unevenly dispersed in the preparation process, which affects the performance of use; long-term stability and reliability in a radiation environment are difficult to guarantee, and it is impossible to effectively absorb or shield nuclear radiation, resulting in the risk of leakage of radioactive substances.

Method used

Benzyl silicone oil is used as the base carrier liquid, nanomagnetic particles modified by hydrocarbon substances with polar groups are used as magnetic powder, epoxy modified silicone oil is used as surfactant, micron magnetic particles coated with silica modified by hydrogen-containing silicone oil are used as thickening agent, and vinyl silicone oil is added as an additive, and viscoelastomer is formed through cross-linking and curing reaction to improve the stability and reliability of the seal.

Benefits of technology

It achieves good dispersion and stability of magnetic grease, improves saturation magnetization and pressure resistance, has good radiation resistance and low volatility, can maintain sealing effect in high temperature and high radiation environments, reduce the risk of leakage of radioactive substances, and improves the reliability of sealing through an intelligent seal feedback mechanism.

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Abstract

The invention provides magnetic grease and a preparation method thereof, and belongs to the technical field of magnetic materials. The magnetic grease is prepared from, by mass, 10%-20% of magnetic powder, 15%-30% of basic carrier liquid, 10%-20% of a surfactant, 10%-50% of a thickening agent and 1%-10% of an additive, the magnetic powder is nano magnetic particles modified by hydrocarbon substances with polar groups, the basic carrier liquid is polymethylphenyl siloxane oil, the surfactant is epoxy modified silicone oil, and the thickening agent is epoxy modified silicone oil. The thickening agent is micron magnetic particles coated with silicon dioxide modified by hydrogen-containing silicone oil, and the additive is vinyl silicone oil. The magnetic grease has excellent magnetic performance, stability, radiation resistance and low volatility, can be competent for a special working environment in the nuclear energy power generation field, can reduce collision and abrasion of parts when encountering abnormal friction in a working state, and automatically feeds back information that sealing is in an abnormal state, so that the reliability of the magnetic grease is improved. Therefore, an operator can find and remove faults in time.
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