Comb-Shaped Polymer Viscosity Index Improver for HTHS Regulation
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Solution Overview
Problem
Current lubricating oil compositions face challenges in effectively reducing High Temperature High Shear (HTHS) viscosity, which significantly impacts fuel consumption in vehicles, and existing viscosity index improvers do not adequately regulate HTHS viscosity to a lower range for improved fuel efficiency.
Innovation Solution
A viscosity index improver composition containing a comb-shaped polymer with specific structural units derived from a macromonomer and monomers like butadiene and hydrogenated butadiene, which effectively regulates HTHS viscosity by incorporating a structural unit from a monomer represented by a particular general formula, enhancing the polymer's ability to lower HTHS viscosity in the effective temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a viscosity index improver composition is added to reduce HTHS viscosity, then fuel consumption is reduced, but the lubricating oil's ability to maintain viscosity at high temperatures is compromised
Solution Approach 1:
The patent modifies the chemical structure parameters of the viscosity index improver by specifying a comb-shaped polymer with particular structural units (formula 1 with specific R1, R2, m, p values) to achieve optimal HTHS viscosity reduction while maintaining high-temperature lubrication properties
Solution Approach 2:
The patent creates a composite polymer structure combining different structural units (formula 1 units with specific side chains and main chain compositions) to achieve synergistic effects that simultaneously reduce HTHS viscosity and maintain high-temperature viscosity
2Use of energy by moving object
If the HTHS viscosity is reduced to improve fuel efficiency, then fuel consumption decreases, but the lubricating film strength is reduced
Solution Approach 1:
The patent applies local quality by designing specific regions of the polymer molecule with different functions: the comb-shaped structure provides viscosity reduction while specific structural units (formula 1) provide film-strengthening properties at the lubrication interface
Solution Approach 2:
The patent segments the polymer into distinct functional units (structural units from formula 1 with specific side chains and main chain segments) where each segment contributes differently to overall performance, with some segments reducing viscosity and others maintaining film strength
Data Source
AI summary
An object is to provide a viscosity index improver composition that is capable of properly regulating the HTHS viscosity in the effective temperature range of a lubricating oil composition to a lower range, and a lubricating oil composition containing the viscosity index improver composition, and the viscosity index improver composition contains a comb-shaped polymer (A) containing a structural unit derived from a macromonomer (α) and a structural unit derived from a particular monomer (A1), the macromonomer (α) having a (meth)acryloyl group at one end, and having a structural unit derived from a monomer (α1) selected from butadiene and hydrogenated butadiene.