Lubricating Oil Defoaming Agent for Centrifugal Stability
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Solution Overview
Problem
Conventional polysiloxane defoaming agents in lubricating oils suffer from precipitation and uneven concentration during long-term storage and use, leading to decreased defoaming performance due to centrifugal effects, especially in machinery with high centrifugal forces.
Innovation Solution
A defoaming agent is produced by polymerizing a polysiloxane macromonomer in a polymerization solvent with a coexisting polyalkyl (meth)acrylate dispersant, using dispersion or solution polymerization to maintain fine particle size and stability, resulting in a lubricating oil composition with improved defoaming performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polysiloxane defoaming agents are used in lubricating oil, then defoaming performance is improved, but the agents precipitate and concentrate unevenly during long-term storage and use under centrifugal effect
Solution Approach 1:
The patent changes the molecular weight parameter of the polysiloxane defoaming agent from conventional high values (300,000-1,500,000 mm²/s) to a lower range (50,000-200,000 mm²/s). This parameter change reduces the specific gravity and improves dispersibility while maintaining defoaming performance, thereby preventing precipitation and concentration unevenness during storage and use under centrifugal effect.
2Reliability
If conventional polysiloxane defoaming agents are used, then initial defoaming effect is achieved, but defoaming effect deteriorates over time due to precipitation
Solution Approach 1:
By changing the molecular weight parameter to a lower range (50,000-200,000 mm²/s), the defoaming agent maintains better stability during long-term storage and use, preventing the deterioration of defoaming effect over time that occurs with conventional high molecular weight agents.
3Reliability
If high molecular weight polysiloxane is used for defoaming, then defoaming performance is achieved, but centrifugal separation occurs in machinery with high centrifugal effect
Solution Approach 1:
The patent reduces the molecular weight parameter of the polysiloxane defoaming agent to (50,000-200,000 mm²/s), which decreases the specific gravity and reduces the tendency for centrifugal separation in machinery such as torque converters and pulleys, while maintaining effective defoaming performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The defoaming agent maintains long-term defoaming performance under high centrifugal conditions, preventing segregation and precipitation, thus ensuring consistent lubrication and reducing foaming in machinery.
Implementation Method 1
polymerizing (B) at least one defoaming agent monomer in (A) a polymerization solvent under coexistence of (C) a polymer soluble in the polymerization solvent
Data Source
Figure 1
AI summary
A defoaming agent obtainable by a process, the process including the step of: (i) polymerizing (B) at least one defoaming agent monomer in (A) a polymerization solvent under coexistence of (C) a polymer soluble in the polymerization solvent.