Acylated Polymeric Surfactants for Low-Viscosity Lubricant Cleanliness
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Solution Overview
Problem
Existing lubricating oil compositions face challenges in achieving effective deposit control and cleanliness while maintaining low viscosity to meet higher automobile fuel economy standards, particularly in lower viscosity grades like 0W-8, 0W-16, and 0W-20, without adversely affecting other properties.
Innovation Solution
A lubricant composition containing a polymeric surfactant compound with an acylated polymer of 500 to 50,000 Daltons molecular weight, comprising branched olefins of 8 to 30 carbon atoms, which can be further reacted with amine or alcohol to form amides, imides, or esters, providing improved dispersancy and viscometric performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher levels of additives are used to meet fuel economy standards and longer oil drain intervals, then deposit control and cleanliness are improved, but viscosity increases significantly making it difficult to attain lower motor oil viscosity grades
Solution Approach 1:
The patent combines multiple functions into a single polymeric surfactant compound that simultaneously provides dispersancy, deposit control, and viscosity modification. This merger eliminates the need for separate additive packages that would otherwise increase overall viscosity, allowing low viscosity grades (0W-8, 0W-16, 0W-20) to achieve effective deposit control and cleanliness.
Solution Approach 2:
The polymeric surfactant compound performs multiple functions including dispersant, detergent, and viscosity modifier activities in one molecule. This multi-functionality allows the lubricant composition to meet fuel economy standards with lower viscosity while maintaining deposit control and cleanliness performance.
2Reliability
If multiple separate additives are used to improve different performance characteristics, then each function is optimized, but the number of components increases adding cost and complexity
Solution Approach 1:
The patent merges dispersant, detergent, and viscosity modifier functions into a single polymeric surfactant compound. This reduces the number of separate additive components in the lubricant formulation, simplifying the overall composition while maintaining optimized performance across multiple characteristics.
Solution Approach 2:
The polymeric surfactant compound is designed with universal multi-functionality, providing dispersancy, deposit control, and viscosity stability simultaneously. This single compound replaces what would traditionally require multiple separate additives, reducing formulation complexity and cost.
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 polymeric surfactant compound enhances lubricating oil performance by improving dispersancy and viscosity stability, meeting or exceeding the requirements of various engine oil and gear oil certification programs, including ILSAC GF-5, ILSAC GF-6, API SN, and API GL-4, while maintaining low viscosity grades.
Implementation Method 1
a polymeric surfactant compound that is an acylated polymer wherein the polymer has a number average molecular weight of 500 to 50,000
Implementation Method 2
viscosity improvers are often used to reduce the extent of the decrease in viscosity as the temperature is raised or to reduce the extent of the increase in viscosity as the temperature is lowered
Data Source
AI summary
The instant disclosure relates to a lubricant composition having an oil of lubricating viscosity, a polymeric surfactant compound that is an acylated polymer having a number average molecular weight of about 500 to about 50,000 where the polymer comprises a branched olefin having from 8 to 30 carbon atoms. The acylated polymer can further be reacted with an amine or alcohol to form an amide, imide, ester or combinations thereof. The present disclosure further relates to lubricant compositions that exhibit good dispersancy and viscometric performance.