Boronic Ester-Modified Polyalkyl(meth)acrylates for Stable Thickening
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Solution Overview
Problem
Existing viscosity index improvers for lubricating oils undergo significant degradation under mechanical stress, leading to a decline in viscosity and thickening properties, especially at higher temperatures, and there is a need for polymers that can associate thermo-reversibly to maintain stability over a broad temperature range.
Innovation Solution
Development of boronic ester-modified polyalkyl(meth)acrylate polymers with specific compositions and molecular weights, allowing for thermo-associative behavior and stability at low treat rates, synthesized using commercially available materials through simple and scalable methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high molecular weight polymers are used as viscosity index improvers, then thickening efficiency is improved, but mechanical stability deteriorates due to significant degradation under mechanical stress
Solution Approach 1:
The patent changes the molecular weight parameter of the polymer from high to lower ranges (Mw: 50,000-200,000 g/mol), which reduces mechanical degradation while maintaining thickening efficiency through optimized chain length and thermo-reversible association behavior
Solution Approach 2:
The patent creates a composite system by combining polymers with specific functional groups (carboxylic acid, hydroxyl, amine) that can form thermo-reversible associations, creating a composite material structure that provides both thickening efficiency and mechanical stability through dynamic bond formation and reversal
2Volume of moving object
If polymer chain length is increased to improve thickening efficiency, then hydrodynamic volume increases, but degradation under mechanical stress increases
Solution Approach 1:
The patent optimizes the polymer chain length parameter to a specific range that provides sufficient hydrodynamic volume for thickening efficiency while remaining below the threshold for excessive mechanical degradation, achieving a balance point in the molecular weight parameter space
3Stability of the object's composition
If polymers are designed for thermo-reversible association, then stability over broad temperature range is improved, but synthesis complexity increases
Solution Approach 1:
The patent selects specific functional group parameters (carboxylic acid, hydroxyl, amine groups) that naturally exhibit thermo-reversible association behavior, allowing the polymer to achieve temperature stability through inherent chemical properties rather than complex structural designs
Solution Approach 2:
The patent uses commercially available polymer materials as starting materials that can be simply modified through straightforward chemical reactions, avoiding the need for complex synthesis procedures while achieving the desired thermo-reversible association properties
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The polymers provide effective viscosity index improvement and thickening properties across a wide temperature range, maintaining lubricant performance and reducing fuel consumption in vehicles.
Implementation Method 1
These compounds can associate and exchange chemical bonds in a thermo-reversible way
Data Source
Figure 1
AI summary
The present invention is directed to boronic ester-modified polyalkyl(meth)acrylate polymers, their use to prepare thermo-associative polymers and a simple, cost-effective method for their preparation.