Lubricant Oil Composition Comb Polymer Mist Suppression
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Solution Overview
Problem
Lubricating oils with low viscosity for internal combustion engines face issues with mist formation, which leads to deposit accumulation on piston surfaces and increased oil consumption, while attempts to improve mist suppression often compromise shear stability.
Innovation Solution
A lubricating oil composition comprising a base oil, a comb-shaped polymer, and an olefin-based copolymer, with specific molecular weight and content ratios, and the inclusion of an ashless dispersant, to achieve a viscosity index of 200 or more and kinematic viscosity of 9.3 to 11.0 mm²/s, enhancing fuel-saving performance and shear stability while suppressing mist formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the viscosity of engine oils is lowered to improve fuel-saving performance, then fuel consumption is reduced, but mist formation increases leading to deposit accumulation and increased oil consumption
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight distribution of the polymer additive and its content in the lubricant composition. By optimizing these parameters, the oil maintains low viscosity for fuel efficiency while the polymer's specific molecular characteristics suppress mist formation through enhanced film-forming properties and reduced volatility.
Solution Approach 2:
The patent uses a composite material approach by combining base oil with a specific polymer additive having controlled molecular weight distribution. This composite lubricant composition achieves synergistic effects where the polymer modifies the base oil's properties to simultaneously reduce mist formation and maintain low viscosity, resolving the contradiction between fuel efficiency and mist suppression.
2Use of energy by moving object
If the viscosity of engine oils is lowered to improve fuel-saving performance, then fuel consumption is reduced, but deposit accumulation on piston surfaces increases
Solution Approach 1:
The patent controls the molecular weight distribution parameters of the polymer additive to prevent deposit formation. By optimizing the polymer's molecular characteristics and concentration, the lubricant maintains low viscosity for fuel efficiency while the polymer's specific structural parameters prevent coking and deposit accumulation on piston surfaces.
Solution Approach 2:
The composite lubricant composition combines base oil with a polymer additive of controlled molecular weight distribution. This composite structure provides fuel-saving performance through low viscosity while the polymer component acts as a deposit inhibitor, preventing carbon buildup and coking on engine surfaces.
3Use of energy by moving object
If the viscosity of engine oils is lowered to improve fuel-saving performance, then fuel consumption is reduced, but oil consumption increases
Solution Approach 1:
The patent optimizes the molecular weight distribution parameters of the polymer additive to reduce oil consumption. By controlling these parameters, the lubricant maintains appropriate viscosity for fuel efficiency while the polymer's specific molecular characteristics enhance film strength and reduce oil vaporization and consumption through improved lubrication film stability.
4Object-generated harmful factors
If additives are added to suppress mist formation, then mist formation is reduced, but shear stability deteriorates
Solution Approach 1:
The patent resolves this contradiction by changing the molecular weight distribution parameters of the polymer additive. By optimizing the molecular weight and its distribution within specific ranges, the polymer provides effective mist suppression while maintaining shear stability through its molecular structure that resists degradation under shear stress.
Solution Approach 2:
The composite lubricant composition uses a polymer additive with controlled molecular weight distribution that provides both mist suppression and shear stability. The specific molecular characteristics of the polymer create a composite material that simultaneously addresses mist formation and maintains compositional stability under shear conditions.
Data Source
AI summary
A lubricating oil composition containing a base oil (A), a comb-shaped polymer (B), and an olefin-based copolymer (C), wherein a content of the component (B) is more than 0.80 mass % based on the total amount of the lubricating oil composition, a weight average molecular weight of the component (C) is 500,000 or more, and the lubricating oil composition has a viscosity index of 200 or more and a kinematic viscosity at 100° C. of 9.3 to 11.0 mm2/s.