Complex Ester Lubricants Shear Stability
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Solution Overview
Problem
Current lubricant compositions face challenges in achieving high shear stability and low-temperature viscosity while maintaining compatibility with sealing materials and reducing the content of expensive polymeric and oligomeric thickeners, which are often costly and have low shear stability.
Innovation Solution
The development of lubricant compositions using high-viscosity complex esters in combination with polar polymers such as alkyl fumarate-alpha-olefin copolymers, which enhance shear stability and reduce viscosity loss under shear stress, allowing for reduced polymer content and improved compatibility with sealing materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric and oligomeric thickeners are used to improve viscosity index and shear stability, then the lubricant composition achieves better rheological properties, but the cost increases and low-temperature viscosity worsens
Solution Approach 1:
The patent changes the chemical composition parameters by using complex esters with specific molecular structures (polyols reacted with dicarboxylic acids and/or monocarboxylic acids) having controlled viscosity ranges (10-1000 cSt at 40°C) instead of conventional polymeric thickeners, achieving comparable shear stability without the cost penalty
Solution Approach 2:
The patent replaces expensive polymeric and oligomeric thickeners with more cost-effective complex esters that can be readily synthesized from readily available polyols and fatty acids, providing an economical alternative that delivers similar performance
2Stability of the object's composition
If polymeric thickeners are used to improve viscosity index, then the lubricant maintains better viscosity at operating temperatures, but the low-temperature viscosity increases and handling becomes difficult
Solution Approach 1:
The patent selects complex esters with specifically controlled viscosity parameters (10-1000 cSt at 40°C) that provide adequate viscosity index improvement while maintaining low enough viscosity for good low-temperature flow characteristics and handling
Solution Approach 2:
The patent uses a blend approach where complex esters with different viscosity characteristics are combined with base oils, allowing optimization of both low-temperature flow and high-temperature viscosity protection through selective component pairing
3Reliability
If high-viscosity complex esters are used to reduce polymer content, then shear stability improves and cost decreases, but the viscosity at low temperatures increases
Solution Approach 1:
The patent carefully controls the viscosity parameter of complex esters at 40°C (10-1000 cSt) to balance shear stability requirements with low-temperature flow needs, avoiding excessive viscosity that would harm cold-weather performance
Solution Approach 2:
The patent creates composite lubricant formulations combining complex esters with base oils and optional polar polymer additives, where the synergistic interaction between components achieves both high shear stability and acceptable low-temperature viscosity through complementary properties
Data Source
AI summary
Proposed are lubricant compounds with a good shear stability defined by the loss of the kinematic viscosity at 100 °C, containing base oil and a synthetic complex ester, the complex ester having a kinematic viscosity at 40°C of greater than 400 and up to 50,000 mm2/s and being obtained by conversion of a) polyols and monocarbonic acids and dicarbonic acids, or of b) polyols and mono-alcohols and dicarbonic acids, or of c) polyols and mono-alcohols and monocarbonic acids and dicarbonic acids. In addition the use of the said lubricant compounds containing the complex esters as oils for vehicle transmission, axles, industrial drives, compressors, turbines or engines is proposed.