Esterified Polyalkylene Glycol Lubricant Additives for Viscosity Control
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Solution Overview
Problem
Current lubricants face challenges in maintaining consistent viscosity across a broad temperature range, with viscosity index improvers increasing viscosity at low temperatures and not effectively addressing friction control in hydrocarbon-based formulations.
Innovation Solution
Esterified oil-soluble polyalkylene glycols (E-OSPs) are introduced, which improve viscosity index and reduce low-temperature viscosity while acting as friction modifiers when added to hydrocarbon base oils, enhancing their performance in lubricant formulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If viscosity index improvers are added to increase viscosity index, then viscosity consistency over temperature range is improved, but low temperature viscosity increases causing high frictional losses
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of polyalkylene glycols through esterification with carboxylic acids. This chemical modification changes the molecular parameters (adding ester groups) to achieve both high viscosity index improvement and low low-temperature viscosity, resolving the contradiction between viscosity stability and low-temperature flow properties
Solution Approach 2:
The invention creates a composite additive system by combining esterified polyalkylene glycol with specific carboxylic acids. This composite structure provides dual functionality: the polyalkylene glycol backbone improves viscosity index while the ester groups reduce low-temperature viscosity, thereby resolving the contradiction between viscosity consistency and low-temperature performance
2Stability of the object's composition
If Group IV base oils (polyalphaolefins) are used to achieve high viscosity index, then viscosity consistency is improved, but cost increases
Solution Approach 1:
The patent changes the chemical parameters of readily available polyalkylene glycols through esterification modification. This transforms a cost-effective base material into a high-performance viscosity index improver that matches or exceeds Group IV base oil performance, thereby resolving the contradiction between viscosity index and manufacturing cost
3Object-generated harmful factors
If low viscosity OSPs are used to reduce low temperature viscosity, then low temperature flow properties are improved, but viscosity index values decrease
Solution Approach 1:
The patent applies parameter changes by esterifying polyalkylene glycols with carboxylic acids having specific chain lengths (C3-C20). This chemical modification allows the additive to provide both low-temperature viscosity reduction and high viscosity index improvement simultaneously, resolving the contradiction between low-temperature flow and viscosity stability
Data Source
AI summary
The present disclosure provides for a lubricant formulation and a method of forming the lubricant formulation for use in an internal combustion engine. The lubricant formulation includes a base oil and an esterified oil-soluble polyalkylene glycol (E-OSP) of Formula (I): R1 [O(R2O)n( R3O)m (C=O)R4]p wherein R1 is a linear alkyi having 1 to 18 carbon atoms, a branched alkyl having 4 to 18 carbon atoms or an aryl with 6 to 30 carbon atoms; R2O is an oxypropylene moiety derived from 1, 2 -propylene oxide; R3O is an oxvbutvlene moiety derived from butylene oxide, wherein R2O and R3O are in a block or a random distribution; R4 is a linear alkyl with 1 to 18 carbon atoms, a branched alkyl with 4 to 1 8 carbon atoms or an aryl with 6 to 18 carbon atoms; n and m are each independently integers ranging from 0 to 20 wherein n + m is greater than 0, and p is an integer from 1 to 4.