GTL Base Oil Viscosity Index Improver for Engine Deposit Control
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Solution Overview
Problem
Conventional lubricating oil compositions for internal combustion engines fail to effectively suppress deposit formation, achieve fuel economy, and maintain performance over time, especially under conditions of engine downsizing and high supercharging, with inadequate volatility and detergency at high temperatures.
Innovation Solution
A lubricating oil composition comprising a GTL base oil as the main component, blended with a comb-like polymethacrylate viscosity index improver, which provides a higher viscosity index and improved oil film retentivity, along with a Group II base oil, to enhance fuel efficiency and detergency at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional lubricating oil compositions are used, then basic lubrication function is provided, but deposit formation occurs and fuel economy is not achieved
Solution Approach 1:
The patent changes the chemical composition parameters by using GTL base oil (50-100 mass%) with specific properties (viscosity index 120-160, sulfur content 0.03 mass% or less) and blending it with Group II base oil in controlled amounts (0-50 mass%). This parameter optimization achieves both low deposit formation and improved fuel economy by reducing oil consumption and combustion efficiency.
Solution Approach 2:
The patent creates a composite lubricating oil system by combining GTL base oil (gas-to-liquid synthetic oil) with Group II base oil (hydroprocessed mineral oil). This composite approach leverages the low sulfur and high cleanliness of GTL oil while using Group II oil to adjust viscosity and performance characteristics, achieving superior detergency and fuel economy compared to conventional single-base oils.
2Power
If engine downsizing and high supercharging are implemented, then power density is improved, but thermal load on engine oil increases and volatility deteriorates
Solution Approach 1:
The patent optimizes the viscosity index parameter to 180 or more (preferably 200-300) by using GTL base oil which naturally has high viscosity index (120-160). This allows the oil to maintain stable viscosity under high thermal loads from downsized, high-supercharged engines, preventing volatility while supporting increased power density.
Solution Approach 2:
The patent uses GTL base oil with extremely low sulfur content (0.03 mass% or less) and high cleanliness, which provides better thermal stability and oxidation resistance. This allows the oil to withstand the harsh thermal conditions of modern high-performance engines for extended periods, effectively managing the thermal load despite reduced oil change intervals.
3Loss of energy
If viscosity index improvers are added to reduce agitation resistance, then fuel consumption is reduced, but deposit formation may increase
Solution Approach 1:
The patent changes the molecular structure parameter of the viscosity index improver by specifying comb-like polymethacrylate with weight average molecular weight of 400,000 or more. This specific molecular architecture provides excellent viscosity index improvement while the low sulfur GTL base oil environment prevents deposit formation, resolving the trade-off between fuel economy and cleanliness.
Data Source
AI summary
The invention provides a lubricating oil composition for internal combustion engines, containing a base oil composition containing a GTL base oil as a main component, and having %Cn of 14 to 25% and an aniline point of 120 to 126°C, and a comb-like polymethacrylate based viscosity index improver having a weight average molecular weight (Mw) of 400,000 or more, wherein a sulfur content is 0.3 mass% or less based on a total weight of the lubricating oil composition.