Low-Viscosity Lubricant Composition for Broad-Range Viscosity Stability
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Solution Overview
Problem
Existing lubricating oil compositions do not adequately address the need for a high viscosity index across a broad temperature range, leading to issues such as increased friction and seizure due to viscosity changes.
Innovation Solution
A lubricating oil composition comprising a base oil with specific properties, including a viscosity index of 100 or more and a polymer with a defined molecular weight ratio, is developed to enhance viscosity stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If viscosity reduction of lubricating oil is implemented for fuel saving, then fuel efficiency is improved, but viscosity stability across temperature range deteriorates causing friction increase and seizure
Solution Approach 1:
The patent applies parameter changes by carefully selecting the viscosity index improver concentration (0.1-10 wt%) and using base oils with specific viscosity index ranges (80-150). This optimization allows the lubricating oil to achieve both reduced viscosity for fuel efficiency and sufficient viscosity stability to prevent friction and seizure across operating temperatures.
Solution Approach 2:
The patent uses composite materials by combining base oil with viscosity index improvers to create a lubricating oil composition that achieves both low viscosity for fuel economy and high viscosity index for temperature stability. This composite approach allows simultaneous optimization of conflicting properties that cannot be achieved with a single component.
2Stability of the object's composition
If viscosity index improver is added to improve temperature dependence of viscosity, then viscosity index is improved, but device complexity increases
Solution Approach 1:
The patent optimizes the concentration parameter of viscosity index improver (0.1-10 wt%) to achieve the desired viscosity index improvement while minimizing composition complexity. By identifying an optimal concentration range, the patent avoids excessive additive packages while still achieving the technical goal of high viscosity index for broad temperature range performance.
3Use of energy by moving object
If base oil viscosity is reduced for fuel saving, then energy consumption is improved, but lubrication film thickness decreases causing member contact and friction increase
Solution Approach 1:
The patent changes the parameter of base oil viscosity selection (100°C kinematic viscosity: 2.0-7.0 mm²/s) and combines it with viscosity index improver addition. This dual approach allows the base oil to have low viscosity for energy efficiency while the viscosity index improver ensures sufficient film thickness and lubrication integrity under operating conditions, preventing direct member contact and friction.
Solution Approach 2:
The patent creates a composite lubricating oil system where base oil provides low viscosity for energy efficiency and viscosity index improver provides film integrity for reliability. This composite material approach resolves the contradiction between energy consumption and lubrication film integrity by combining components with complementary functions.
Data Source
AI summary
A lubricating oil composition, containing a base oil (A) that satisfies the following requirements (A-1) to (A-4), and a polymer (B) that satisfies the following requirements (B-1) and (B-2): (A-1): a 100° C. kinematic viscosity is 2.0 mm2/s or more and less than 7.0 mm2/s, (A-2): a viscosity index is 100 or more, (A-3): a content of cycloparaffin is 35.0% by volume or less based on a total volume of the base oil (A), (A-4): an aromatic content (% CA) is less than 1.0, (B-1): a ratio of a mass-average molecular weight (Mw) to a number-average molecular weight (Mn), [Mw/Mn] is 1.0 or more and less than 6.0, (B-2): a ratio of a peak integral value (I10) at a chemical shift 10.0 to 11.0 ppm to a peak integral value (I14) at a chemical shift 13.5 to 14.5 ppm, as determined in 13C-NMR analysis, [I10/I14] is 0.05 or more.