Poly(meth)acrylate Viscosity Index Improver for Lubricants
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Solution Overview
Problem
Current lubricant oils face challenges in maintaining consistent viscosity across a wide temperature range, leading to reduced effectiveness at high and low temperatures, which affects friction and wear characteristics in applications like automatic transmission fluids.
Innovation Solution
A polymer composition comprising 88-96 mole percent of alkyl (meth)acrylate monomers with specific molar ratios of long and short chain alkyl esters, combined with 2-hydroxyethyl (meth)acrylate, is used as a viscosity index improver to enhance the viscosity index and thickening power of lubricating oils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If viscosity index improvers are added to reduce lubricant viscosity changes at high and low temperatures, then the lubricating effect can be extended across a wider temperature range, but the manufacturing complexity and product costs increase
Solution Approach 1:
The patent changes the chemical parameters of the polymer by controlling the molar ratio of long chain to short chain alkyl (meth)acrylate monomers (greater than 2.0 and less than 5.5) and incorporating 2-hydroxyethyl (meth)acrylate (0.1-6 mole percent). This parameter optimization achieves high viscosity index improvement while using a relatively simple polymer composition without complex multi-component systems.
Solution Approach 2:
The patent creates a composite polymer structure combining different alkyl chain length monomers (long chain C12-C20 and short chain C1-C4) with 2-hydroxyethyl (meth)acrylate in specific ratios. This composite approach at the molecular level provides enhanced viscosity index improvement compared to single monomer polymers, while avoiding the complexity of multi-additive systems.
2Stability of the object's composition
If advanced technology structures are used for viscosity index improvers, then the viscosity index improvement effect is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent optimizes manufacturing cost by controlling polymerization parameters to achieve a weight average molecular weight of 10,000-500,000 and polydispersity of 1.05-5.0. These parameter ranges balance performance with manufacturability, avoiding the need for advanced or costly polymerization technologies while achieving VI improvement of 50-200 points.
Solution Approach 2:
The patent applies local quality by incorporating 2-hydroxyethyl (meth)acrylate at specific concentrations (0.1-6 mole percent) within the polymer structure. This localized functional group incorporation provides enhanced viscosity index improvement without requiring advanced technology throughout the entire polymer structure, maintaining manufacturing simplicity.
3Stability of the object's composition
If higher levels of viscosity index improver components are added, then the viscosity index improvement effect is enhanced, but the treat rate and product costs increase
Solution Approach 1:
The patent achieves high viscosity index improvement (50-200 points) at low treat rates (0.1-10 weight percent) through the composite polymer structure combining long chain alkyl (meth)acrylate, short chain alkyl (meth)acrylate, and 2-hydroxyethyl (meth)acrylate. The synergistic effect of these components maximizes VI improvement per unit of additive, reducing the quantity needed compared to conventional single-component VIIs.
Solution Approach 2:
The patent changes the chemical composition parameters to achieve higher thickening power, allowing effective VI improvement at lower concentrations. The specific molar ratios and molecular weight parameters are optimized to maximize the viscosity index improvement per unit of additive, reducing the treat rate required.
Data Source
AI summary
The present disclosure relates to polymers suitable for viscosity index improvers in lubricating oil compositions and further relates to oil compositions comprising such polymers. The disclosure also relates to polymer compositions derived from alkyl (meth)acrylate monomers and selected molar ratios of the (meth)acrylate monomers in the polymer suitable to use as viscosity modifiers.