Defoaming agent, lubricating oil composition containing defoaming agent, and machine using lubricating oil composition

By using defoamers formed from polymerizable monomers with specific structures, the problem of reduced defoaming properties of polysiloxane-based defoamers at high temperatures has been solved, achieving the effect of maintaining excellent defoaming and lubrication performance at high temperatures.

CN122121935APending Publication Date: 2026-05-29DIC CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DIC CORP
Filing Date
2024-10-31
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing polysiloxane-based defoamers exhibit significantly reduced defoaming properties at high temperatures, failing to meet the defoaming requirements of lubricating oils at high temperatures, thus leading to decreased lubrication performance.

Method used

By using specific polymerizable monomers as polymer components, including polymerizable monomers with -[OSi(R)2]x- and -Si[OSi(R)3]n[R']3-n structures, and combining them with other polymerizable monomers such as (meth)acryloyl groups, defoamers with excellent defoaming properties are formed.

Benefits of technology

It maintains excellent defoaming and lubricating properties in high-temperature environments, prevents lubricating oil from foaming, improves the cooling efficiency of lubricating oil, and prevents wear.

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Abstract

The present invention provides a defoaming agent that exhibits excellent defoaming properties even in a high-temperature environment. A defoaming agent containing, as a polymer that polymerizes a polymerization component, at least a polymerization monomer (a1) having a polysiloxane structure represented by -[OSi(R)2] x (R is independently an alkyl group having 1 to 6 carbon atoms; x is a repeating number) and having two or more polymerizable unsaturated groups, and / or a polymerization monomer (a2) having -Si[OSi(R)3] n [R'] 3‑n (n is an integer of 1 to 3; R is independently an alkyl group having 1 to 6 carbon atoms; R' is independently an alkyl group having 1 to 6 carbon atoms) as a functional group and having two or more polymerizable unsaturated groups.
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