Lubricating Oil Composition with Non-Hydrogenated Olefin Polymer
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Solution Overview
Problem
Current lubricating oil compositions for diesel engines face challenges in achieving optimal piston cleanliness, viscosity index improvement, and compliance with stringent performance criteria such as volatility, fuel economy, and environmental regulations, particularly due to limitations in additive components and base stocks.
Innovation Solution
A multigrade crankcase lubricating oil composition incorporating a minor amount of non-hydrogenated olefin polymer, such as polyisobutene, alongside mineral oil, dispersants, metal detergents, and other additives, which reduces the need for viscosity index improvers while maintaining performance standards and improving piston cleanliness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mineral oil-based lubricating oil compositions are used, then they can meet basic lubrication requirements, but they fail to achieve optimal piston cleanliness and require higher amounts of viscosity index improvers
Solution Approach 1:
The patent changes the chemical composition parameters by introducing non-hydrogenated olefin polymer (polyisobutene) with specific molecular weight (100-5000) and purity (≥90%) into the lubricating oil formulation. This parameter change enables achieving piston cleanliness of VWTDi ≤ 50 while maintaining multigrade viscosity characteristics, thereby resolving the contradiction between reliability and formulation complexity.
2Stability of the object's composition
If higher amounts of viscosity index improvers are used to maintain viscosity grade, then viscosity performance is improved, but piston cleanliness deteriorates and formulation complexity increases
Solution Approach 1:
The non-hydrogenated olefin polymer serves multiple functions simultaneously: it acts as a viscosity index improver, a piston cleanliness agent, and a formulation simplifier. By incorporating this multi-functional additive at low concentrations (1-15 mass%), the patent achieves both viscosity grade maintenance and piston cleanliness improvement without requiring separate dedicated additives for each function.
Solution Approach 2:
The patent optimizes the concentration parameter of the non-hydrogenated olefin polymer within the range of 1-15 mass% to achieve the desired balance between viscosity maintenance and piston cleanliness. This parameter optimization allows reducing the total amount of viscosity index improvers needed while maintaining multigrade performance.
3Object-affected harmful factors
If stringent performance criteria are imposed to meet environmental regulations, then environmental compliance is improved, but formulation flexibility is reduced
Solution Approach 1:
The patent adopts specific parameter specifications for the non-hydrogenated olefin polymer (molecular weight 100-5000, purity ≥90%, specific chemical structure) that enable compliance with environmental regulations regarding sulfur, phosphorus, and ash content while maintaining formulation flexibility. The defined compositional parameters provide a standardized approach that can be applied across different lubricating oil formulations.
Data Source
AI summary
A multigrade crankcase lubricating oil composition comprising a mineral oil-based basestock of lubricating viscosity in a major amount and a non-hydrogenated olefin polymer in a minor amount. The lubricating oil composition also comprises a dispersant, a metal detergent, one or more other additives, and a viscosity modifier.