Defoaming Agent for Lubricating Oil Centrifugal Stability
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Solution Overview
Problem
Conventional lubricating oils with silicone defoaming agents suffer from precipitation and uneven concentration over time, leading to reduced defoaming performance due to centrifugal effects in machinery, causing increased foaming and impaired lubrication.
Innovation Solution
A defoaming agent is developed through a polymerization process involving polymerizable monomers and non-polymerizable polysiloxanes, which are dissolved in a solvent, ensuring the agent remains finely dispersed and stable even under high centrifugal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional silicone defoaming agent is used in lubricating oil, then initial defoaming performance is achieved, but defoaming performance degrades over time due to precipitation and concentration unevenness
Solution Approach 1:
The invention uses a composite defoaming agent consisting of polysiloxane combined with at least one of fluorinated hydrocarbons or perfluorinated hydrocarbons. This composite structure prevents phase separation and precipitation that occur with conventional single-component silicone defoaming agents, maintaining concentration uniformity and reliable defoaming performance over time.
Solution Approach 2:
The invention changes the chemical composition parameters by introducing fluorinated or perfluorinated hydrocarbons with specific fluorine content (at least one fluorine atom). This parameter change alters the density and chemical properties of the defoaming agent, preventing centrifugal separation and precipitation while maintaining effective defoaming concentration throughout the lubricating oil's service life.
2Reliability
If a silicone defoaming agent is used in machinery with high centrifugal effects, then initial defoaming function is provided, but the agent separates and concentrates in specific positions, reducing defoaming effectiveness
Solution Approach 1:
The composite defoaming agent combining polysiloxane with fluorinated or perfluorinated hydrocarbons creates a chemically stable mixture that resists centrifugal separation. The fluorinated components adjust the overall density and intermolecular forces, ensuring uniform concentration distribution even in machinery with high centrifugal effects like torque converters and CVT pulleys.
Solution Approach 2:
The fluorinated or perfluorinated hydrocarbons act as intermediary substances between the polysiloxane and the lubricating oil. This intermediary composition mediates the interaction forces, preventing the defoaming agent from separating and concentrating in specific positions under centrifugal influence, thereby maintaining uniform distribution and consistent defoaming function.
3Duration of action of stationary object
If long-term storage of lubricating oil with silicone defoaming agent occurs, then storage is possible, but precipitation and concentration unevenness occur, causing defoaming performance to disappear
Solution Approach 1:
The composite defoaming agent structure of polysiloxane combined with fluorinated or perfluorinated hydrocarbons provides long-term storage stability. The chemically stable composite prevents precipitation and maintains concentration uniformity during extended storage periods, ensuring defoaming performance is preserved from initial use through long-term storage and into extended service life.
Solution Approach 2:
The invention applies beforehand cushioning by pre-combining polysiloxane with fluorinated or perfluorinated hydrocarbons to create a stable composite formulation. This preparatory compositional adjustment cushions against future precipitation and concentration unevenness that would otherwise occur during long-term storage, preserving defoaming performance throughout the lubricating oil's entire service cycle.
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 solution prevents defoaming performance degradation during long-term storage and maintains effective lubrication under high centrifugal conditions, suppressing foaming and related issues like hydraulic control failure and wear.
Implementation Method 1
polymerizing (A) at least one polymerizable monomer in a composition, the composition comprising (C) a solvent and (B) at least one non-polymerizable polysiloxane dissolved in the (C) solvent
Implementation Method 2
a defoaming agent that can prevent defoaming performance from impairing even during long-term storage, and that can keep the deforming performance of a lubricating oil for a long time even under such a lubricating condition that a high centrifugal effect occurs
Implementation Method 3
a torque converter included in an automatic transmission, or a pulley included in a metal belt-type continuously variable transmission has a position where a very great centrifugal effect occurs. When a lubricating oil is supplied to such a position, a silicone defoaming agent compound used as a defoaming agent is separated by such a centrifugal effect, and concentrates in a specific position of the machinery
Data Source
AI summary
A defoaming agent obtainable by a process that includes: polymerizing (A) at least one polymerizable monomer in a composition, the composition comprising (C) a solvent and (B) at least one non-polymerizable polysiloxane dissolved in the (C) solvent, wherein the component (A) optionally comprises at least one Si-atom-containing monomer in an amount of less than 10 mass % on the basis of the total mass of the component (A).