Ternary Ethylene-Propylene-Butylene Polymer Viscosity Index Improver
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Solution Overview
Problem
Conventional ethylene-propylene copolymers used as viscosity index improvers in lubricating oils contribute to piston deposits and oil thickening when subjected to high temperature operations, limiting their effectiveness.
Innovation Solution
A lubricant composition comprising a polymer with structural units derived from ethylene, propylene, and butylene, in specific molecular ratios, along with a dispersant and an overbased sulfonate detergent, to reduce piston deposits and viscosity increase under high temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional ethylene-propylene copolymers are used as viscosity index improvers, then viscosity improvement is achieved, but piston deposits and oil thickening occur under high temperature conditions
Solution Approach 1:
The patent changes the compositional parameters of the copolymer by limiting ethylene content to 10-30 mol% and propylene to 70-90 mol%, which fundamentally alters the polymer's thermal behavior and deposit-forming tendencies while preserving viscosity improvement capability
Solution Approach 2:
The invention creates a composite polymer structure incorporating three types of structural units (ethylene, propylene, and higher α-olefin) with specific compositional ratios, where each component contributes different properties that collectively resolve the contradiction between viscosity improvement and deposit reduction
2Stability of the object's composition
If conventional ethylene-propylene copolymers are used as viscosity index improvers, then viscosity improvement is achieved, but oil thickening occurs under high temperature conditions
Solution Approach 1:
The patent modifies the compositional parameters by incorporating higher α-olefins (C4-C20) in specific amounts (5-40 mol%), which changes the polymer's thermal response characteristics and reduces excessive viscosity increase at high temperatures
Solution Approach 2:
The invention introduces structural diversity at the molecular level by incorporating higher α-olefin units with specific carbon chain lengths (C4-C20), creating local structural variations that prevent uniform polymer collapse or aggregation under high temperature stress
Data Source
AI summary
The disclosed invention relates to lubricant compositions containing viscosity index improvers in the form of polymers comprising structural units derived from ethylene, propylene and butylenes.