Lubricating Oil Copolymer Sludge Reduction
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Solution Overview
Problem
Lubricating oils used in wind-power generation equipment face challenges in maintaining extreme pressure resistance while minimizing sludge generation and ensuring high viscosity index, especially in remote locations with limited maintenance access, where oxidative stability and low temperature flow characteristics are critical.
Innovation Solution
A lubricating oil composition comprising 50-90% lubricating oil base oil and 10-50% copolymer of olefin and alkyl methacrylate with a weight average molecular weight of 5000-20,000, along with 5-14% carboxylic acid ester compounds, specifically polyol esters, to enhance extreme pressure properties and reduce sludge formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extreme pressure agents are blended in gear oils to resist welding, then extreme pressure properties are improved, but sludge generation increases through ageing and oxidation
Solution Approach 1:
The patent changes the molecular weight parameter of the copolymer from conventional ranges to a specific range of 5,000 to 20,000. This parameter change optimizes the balance between extreme pressure protection and oxidative stability, reducing sludge generation while maintaining welding resistance.
Solution Approach 2:
The patent uses a composite lubricating oil formulation combining base oil, copolymer viscosity index improver (with specific molecular weight), and extreme pressure agents. This composite approach allows the different components to work synergistically, with the copolymer providing both viscosity improvement and oxidative stability to mitigate sludge formation from extreme pressure agents.
2Stability of the object's composition
If copolymers of olefins and alkyl methacrylates are used as viscosity index improvers, then viscosity index is improved, but sludge generation is not reduced
Solution Approach 1:
The patent identifies that conventional copolymers lack optimal molecular weight control. By changing the molecular weight parameter to 5,000-20,000, the copolymer achieves dual functionality: maintaining high viscosity index while providing oxidative stability that reduces sludge generation from extreme pressure agents.
Data Source
Figure 1
AI summary
The object of this invention is to offer a lubricating oil composition which has superior extreme pressure properties (ability to prevent welding), which generates a small amount of sludge and which also has a high viscosity index. The invention provides a lubricating oil composition to which has been added a copolymer of specified olefins and alkyl methacrylates.