Glycol Ether Aryl Lubricant Base Stocks for Low Viscosity and Volatility
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Solution Overview
Problem
Current lubricant base stocks face challenges in achieving simultaneous improvements in fuel economy, solubility and dispersibility of polar additives, oxidative stability, and hydrolytic stability, particularly in high-temperature and oxidative stress environments, while also meeting volatility and viscosity requirements.
Innovation Solution
The development of glycol ether substituted aryl compounds with specific viscosity, volatility, and thermal-oxidative stability properties, which are used as base stocks or cobase stocks in lubricating oils to enhance fuel economy, solvency for polar additives, and oxidative stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If base oil viscosity is lowered to improve fuel economy, then fuel economy improves, but volatility increases and thermal-oxidative stability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the base stock by introducing glycol ether substituted aryl compounds with specific molecular structures (Formula I and II). These compounds have carefully controlled molecular weights, aromatic content, and ether linkage configurations that enable ultra-low viscosity (Kv100 < 2 cSt) while maintaining adequate volatility (Noack < 15%) and thermal-oxidative stability through the stabilizing effect of the aromatic rings and ether oxygens.
Solution Approach 2:
The patent creates a composite base stock system by blending glycol ether substituted aryl compounds with other lubricant base stocks (PAO, GTL, or other esters). This composite approach allows the glycol ether aryl component to provide ultra-low viscosity and fuel economy benefits, while the blended mixture maintains overall thermal-oxidative stability and meets API specification requirements through synergistic interactions between components.
2Use of energy by moving object
If base oil viscosity is lowered to improve fuel economy, then fuel economy improves, but volatility increases
Solution Approach 1:
The patent modifies the physical-chemical parameters of the base stock by using glycol ether substituted aryl compounds with specific molecular weight ranges (C10-C30 total carbons) and controlled aromatic ring substitutions. These parameter optimizations enable the base stock to achieve Kv100 < 2 cSt for fuel economy while the aromatic rings and ether linkages provide intermolecular forces that reduce volatility and meet Noack < 15% requirements.
3Stability of the object's composition
If polar additives are added to improve solubility and dispersancy, then solubility and dispersancy improve, but oxidative stability deteriorates
Solution Approach 1:
The patent changes the base stock's polarity parameters by incorporating glycol ether substituted aryl compounds that contain both aromatic rings (non-polar) and ether oxygens (polar). This creates a base stock with moderate polarity that enhances solubility and dispersancy of polar additives while the dominant aromatic structure maintains oxidative stability, eliminating the need for high concentrations of polar cobase stocks that would compromise oxidative stability.
Data Source
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AI summary
A composition that includes one or more compounds represented by the formula R1 -- O - R2 wherein R1 is a substituted or unsubstituted aryl or polyaryl group having from about 4 to about 40 carbon atoms, and R2 is the residue of a substituted or unsubstituted glycol ether having from about 4 to about 40 carbon atoms. The composition has a viscosity (Kv100) from about 1 to about 10 cSt at 100°C as determined by ASTM D-445, a viscosity index (VI) from about -100 to about 300 as determined by ASTM D-2270, and a Noack volatility of no greater than 50 percent as determined by ASTM D-5800. The disclosure also relates to a process for producing the composition, a lubricating oil base stock and lubricating oil containing the composition, and a method for improving one or more of oxidative stability, solubility and dispersancy of polar additives of a lubricating oil by using as the lubricating oil a formulated oil containing the composition.