Alpha-Olefin Copolymer Viscosity Improver for High-Shear Lubrication
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Solution Overview
Problem
Existing lubricating oils face challenges in maintaining viscosity stability under high-temperature and high-shear conditions, leading to increased metal wear and reduced fuel efficiency in internal combustion engines.
Innovation Solution
A lubricating oil viscosity index improver is developed using a liquid alpha-olefin copolymer with a specific molecular weight range, shear stability index, and thickening power, which is copolymerized with ethylene and alpha-olefin monomers, enhancing shear stability and high-temperature high-shear viscosity properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the molecular weight of lubricating oil viscosity index improver is increased to achieve high viscosity index, then the viscosity index is improved, but shear stability is reduced due to high shear conditions
Solution Approach 1:
The patent changes the molecular weight parameter of the viscosity index improver from conventional high molecular weight (>650,000 g/mol) to a specific lower range (150,000-650,000 g/mol), while simultaneously optimizing the thickening power parameter (2.2-3.5 cSt at 100°C). This parameter transformation resolves the contradiction by achieving adequate viscosity index improvement while maintaining shear stability under high shear conditions.
2Ease of operation
If conventional viscosity index improvers are used to maintain viscosity at low temperatures, then cold start performance is improved, but viscosity stability at high temperatures deteriorates
Solution Approach 1:
The patent optimizes the molecular weight distribution and thickening power parameters of the viscosity index improver to achieve a balanced performance across temperature ranges. By controlling the molecular weight (150,000-650,000 g/mol) and thickening power (2.2-3.5 cSt at 100°C), the formulation maintains adequate viscosity at low temperatures for cold starts while ensuring viscosity stability at high operating temperatures.
3Temperature
If molecular weight of viscosity index improver is increased to improve high-temperature viscosity, then high-temperature viscosity is improved, but fuel efficiency deteriorates due to increased friction
Solution Approach 1:
The patent transforms the molecular weight parameter from conventional high values (>650,000 g/mol) to an optimized range (150,000-650,000 g/mol) and controls thickening power within 2.2-3.5 cSt at 100°C. This parameter optimization maintains adequate high-temperature viscosity for engine protection while reducing excessive friction, thereby improving fuel efficiency.
Data Source
AI summary
Proposed is a lubricating oil viscosity index improver containing a liquid alpha-olefin copolymer in which ethylene and an alpha-olefin monomer having 3 or more carbon atoms are copolymerized, wherein the liquid alpha-olefin copolymer is characterized by having a weight average molecular weight (Mw) in the range of 10,000 to 120,000 g/mol, a permanent shear stability index (PSSI) of greater than 1 and less than 25, and a thickening power of greater than 2.5 cSt and less than 3.6 cSt at a temperature of 100°C. In addition, proposed is a lubricating oil composition containing the lubricating oil viscosity index improver.