Multifunctional Lubricant Polymer Blend for Viscosity Control
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Solution Overview
Problem
Current multifunctional lubricating oils fail to achieve optimal viscosity levels simultaneously in engines, gearboxes, and hydraulic circuits, leading to performance compromises and issues with hot behavior in engines and cold starting of hydraulics, due to the sensitivity of viscosity-improving polymers to shear rates.
Innovation Solution
A lubricating composition comprising a blend of polymers with different shear stabilities, specifically type 'A', 'B', and 'C' polymers, which differ in their permanent shear stability index (PSSI), is used to maintain optimal viscosity across various components, ensuring quick adaptation to specific conditions through a tailored viscosity profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a very shear-sensitive viscosity-improving polymer is used, then the viscosity drops quickly in high-shear components like hydraulic circuits, but the minimum viscosity requirements in engines and gearboxes fall below the required levels
Solution Approach 1:
The patent divides the viscosity-improving polymer function into multiple segments by using a blend of at least two different polymers with different shear stabilities. This allows different polymers to serve different functions: some polymers provide quick viscosity drop for hydraulic circuits while others maintain minimum viscosity for engines and gearboxes, thereby resolving the contradiction between fast adaptation and minimum viscosity maintenance.
Solution Approach 2:
The patent changes the parameter of polymer shear stability by selecting polymers with different permanent shear stability indices (PSSI). By adjusting the PSSI values and proportions of different polymers in the blend, the formulation achieves both quick viscosity adaptation for hydraulic circuits and sustained minimum viscosity for engines and gearboxes, resolving the contradiction through parameter optimization.
2Stability of the object's composition
If a very shear-stable polymer is used, then the viscosity remains high for a long time, but it takes a very long time for the viscosity to reach sufficiently low values in high-shear components like hydraulic circuits
Solution Approach 1:
The patent segments the viscosity control function by using a polymer blend where some polymers provide immediate viscosity reduction for hydraulic circuits while others maintain stability for engines and gearboxes. This segmentation allows simultaneous achievement of fast adaptation and long-term stability without relying on a single polymer type.
Solution Approach 2:
The patent employs a composite approach by formulating a lubricant with a blend of at least two different polymers having different shear stabilities. This composite polymer system combines the advantages of both shear-sensitive and shear-stable polymers, achieving both rapid viscosity adaptation and sustained stability across different operating conditions.
3Adaptability or versatility
If intermediate behavior polymer is used, then the viscosity adjusts moderately, but the performance levels are not achieved simultaneously in all three target organs
Solution Approach 1:
The patent segments the viscosity control function by using a blend of at least two different polymers with different shear stabilities. This allows different polymers to serve different functions: some polymers provide quick viscosity drop for hydraulic circuits while others maintain minimum viscosity for engines and gearboxes, thereby resolving the contradiction between fast adaptation and minimum viscosity maintenance.
Solution Approach 2:
The patent employs a composite approach by formulating a lubricant with a blend of at least two different polymers having different shear stabilities. This composite polymer system combines the advantages of both shear-sensitive and shear-stable polymers, achieving both rapid viscosity adaptation and sustained stability across different operating conditions.
4Ease of operation
If a single multifunctional oil is used for engine, gearbox and hydraulic circuit, then maintenance and storage are simplified, but the viscosity levels cannot be optimized for all three components simultaneously
Solution Approach 1:
The patent achieves multi-functionality by formulating a single lubricant that can be used in engines, gearboxes, and hydraulic circuits simultaneously. The blend of at least two polymers with different shear stabilities enables this universal lubricant to provide appropriate viscosity levels for all three components, resolving the contradiction between operational simplicity and performance optimization.
Solution Approach 2:
The patent uses parameter changes by adjusting the composition and proportions of different polymers in the blend to achieve optimal viscosity levels across multiple applications. By optimizing the polymer blend parameters, the lubricant can simultaneously satisfy the viscosity requirements of engines, gearboxes, and hydraulic circuits while maintaining ease of maintenance and storage.
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 composition effectively maintains viscosity levels suitable for engines, gearboxes, and hydraulic circuits, addressing performance limitations by adapting to shear conditions, thus enhancing heat resistance in engines and transmissions while ensuring proper cold starting of hydraulics.
Implementation Method 1
the permanent shear undergone by the viscosity-improving polymer leads to a reduction in the viscosity of the oil
Implementation Method 2
The greater or lesser shear stability of the viscosity-improving polymer incorporated in these multifunctional engine, gearbox and hydraulic circuit oils will determine the respective viscosity levels reached by this oil in each component
Data Source
AI summary
The multi-functional lubricating fluid is lubricant composition comprising oil of group I-V and mixture of at least two polymers. The lubricating fluid has viscosity of more than 9 cSt, preferably 9-12 cSt for 30 grade starting oil and more than 12 cSt, preferably 12-15 cSt for 40 grade starting oil at 1000[deg] C, viscosity of more than 8.5 cSt, preferably 8.5-11 cSt for 30 or 40 grade starting oil at 1000[deg] C after 20 hours KRL test, and viscosity of less than 51 cSt, preferably 41-51 cSt for 30 or 40 grade starting oil at 400[deg] C after 3 hours KRL test for 3 hours. The multi-functional lubricating fluid is a lubricant composition comprising at least one oil of group I-V and a mixture of at least two polymers having difference of permanent shearing stability index (PSSI) of 50 measured by standardized KRL test at 1000[deg] C for 20 hours. The lubricating fluid has viscosity of more than 9 cSt, preferably 9-12 cSt for 30 grade starting oil and more than 12 cSt, preferably 12-15 cSt for 40 grade starting oil at 1000[deg] C after 30 cycle Bosch test following CEC-L-14-A-93 standard, viscosity of more than 8.5 cSt, preferably 8.5-11 cSt for 30 or 40 grade starting oil at 1000[deg] C after 20 hours KRL test following CEC-L-45-A-99 standard, and viscosity of less than 51 cSt, preferably 41-51 cSt for 30 or 40 grade starting oil at 400[deg] C after 3 hours KRL test following CEC-L-45-A-99 standard for 3 hours.