Modified nitrile rubber, method for producing the same, and use thereof

CN122167663APending Publication Date: 2026-06-09CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2024-12-06
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In the existing technology, nitrile rubber has poor adhesion to metal, and demulsification and uneven crystal dispersion are prone to occur during the modification process, which affects the bonding strength.

Method used

Nonionic composite emulsifier and graft monomer methacrylic acid are added to nitrile rubber latex to form methacrylic acid-grafted nitrile rubber through initiation reaction. Then, flocculation treatment is carried out, and finally, it is mixed with zinc oxide to obtain modified nitrile rubber, which enhances its polarity and improves its adhesion index to the metal matrix.

Benefits of technology

It improves the adhesion strength between nitrile rubber and the metal matrix, simplifies the surface treatment process, and enhances the adhesion with the metal skeleton.

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Abstract

This invention belongs to the technical field of rubber products and their preparation, specifically relating to modified nitrile butadiene rubber (NBR) for metal bonding, its preparation method, and applications. The preparation method of the modified NBR according to this invention includes the following steps: first, a nonionic composite emulsifier is added to NBR latex, followed by the addition of the grafted monomer methacrylic acid. Through an initiation reaction, a methacrylic acid-grafted NBR latex is obtained. Then, after flocculation treatment, the grafted modified NBR is obtained. Finally, an initiator and zinc oxide are added, and the mixture is stirred to obtain the modified NBR. The modified NBR prepared by the method of this invention exhibits strong polarity and a high adhesion index to the metal matrix after vulcanization.
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