Lubricant Composition Bi-Modal Side Chain Distribution
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Solution Overview
Problem
Lubricant compositions, particularly those using API Group III base stocks, face challenges in achieving improved low temperature flow properties to meet stringent performance requirements for oil volatility and fuel efficiency.
Innovation Solution
A lubricant composition comprising an API Group III base stock, a semi-crystalline viscosity modifier, and lubricating oil flow improvers (LOFIs) with specific side-chain distribution characteristics, including a bi-modal distribution with a lower portion primarily composed of C12 and an upper portion of C16 or C18, ensuring the total mole percentage of the upper portion is less than the lower portion, and C12 constitutes at least 40 mole % of the total side chain distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If API Group III base stocks are used to meet volatility and fuel efficiency requirements, then oil volatility and fuel efficiency are improved, but low temperature flow properties deteriorate
Solution Approach 1:
The patent applies parameter changes by carefully controlling the side-chain distribution parameters of the LOFI molecules. Specifically, it sets the average side-chain carbon number between 12.4-14.4 and creates a bi-modal distribution with C12 and C16/C18 components, where C12 constitutes at least 40 mole %. This precise parameter control allows the LOFI to effectively modify wax crystal morphology without excessive viscosity increase, resolving the contradiction between fuel efficiency and low temperature flow properties
Solution Approach 2:
The patent uses a composite approach by combining multiple components with specific functions: API Group III base stock for volatility and fuel efficiency, semi-crystalline viscosity modifier for viscosity control, and bi-modal LOFI for wax crystal modification. This composite formulation allows each component to address specific requirements, collectively resolving the contradiction between improved fuel efficiency and maintained low temperature flowability
2Stability of the object's composition
If viscosity modifiers are added to improve viscosity characteristics, then viscosity stability is improved, but low temperature pumpability deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the side-chain distribution of LOFI to have a bi-modal pattern with average carbon number 12.4-14.4. This specific parameter range allows the LOFI to effectively interact with wax crystals at low temperatures without causing excessive viscosity increase, thereby maintaining pumpability while providing viscosity stability through the semi-crystalline viscosity modifier
3Strength
If LOFI with higher viscosity is used to improve film strength, then lubrication performance is improved, but flow properties at low temperature deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the side-chain carbon distribution (bi-modal with C12 ≥40 mole %, average 12.4-14.4) of the LOFI. This parameter optimization allows the molecule to provide adequate film strength through effective wax crystal modification while maintaining low enough viscosity to ensure good low temperature flow properties, thus resolving the contradiction between film strength and flowability
Data Source
AI summary
A lubricant composition is disclosed. The lubricant composition is made up of (a) an API Group III base stock; (b) one or more semi-crystalline viscosity modifier; and (c) one or more LOFIs having a side-chain distribution which satisfies the following requirements: (1) the distribution contains side chains ranging from C8 to C18 with an average carbon number ranging from 12.4 to 14.4; (2) the side chain distribution is bi-modal with a lower portion of the bi-modal distribution made up primarily of C12 and an upper portion of the distribution made up primarily of C16, C18 or combinations thereof; (3) the total mole % of the upper portion of the distribution must be less than that of the lower portion of the distribution; and (4) the amount of C12 on the side chain must be at least 40 mole % of the total side chain distribution.