Hydroxyl-Terminated Polyether Dispersants for Low-Ash Engine Oils
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current engine oil formulations face challenges with deposit formation due to increased thermal stress and restrictive emissions regulations, which limit the use of ash-bearing components, necessitating the development of robust lubricants with low deposit propensity and improved thermal stability.
Innovation Solution
A dispersant composition comprising the reaction product of a polyolefin acylating agent and a hydroxyl terminated polyether, combined with optional synergistic dispersants, is used to enhance deposit performance, seal compatibility, and maintain Total Base Number (TBN) in engine oils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If high molecular weight polyamine succinimide dispersants are used to curb deposits, then deposit control is improved, but ash-bearing components poison after treatment devices due to emissions regulations
Solution Approach 1:
The invention changes the chemical composition parameters by using hydroxyl terminated polyethers with specific molecular weights (100-1500) and m ratios (2-15) instead of conventional high molecular weight polyamine succinimide dispersants. This parameter substitution eliminates ash-bearing components while maintaining deposit control functionality through the unique polyether structure that provides both dispersancy and thermal stability without forming harmful ash.
Solution Approach 2:
The invention creates a composite dispersant system by combining polyolefin acylating agents with hydroxyl terminated polyethers to form a reaction product that integrates the benefits of both components. This composite structure provides effective deposit control and thermal stress resistance without the harmful ash-forming properties of conventional dispersants, thereby protecting after treatment devices.
2Use of energy by moving object
If engine oil formulations are designed for fuel efficiency with smaller sump sizes and turbocharging, then fuel efficiency is improved, but thermal stress on engine oil increases leading to greater deposit formation
Solution Approach 1:
The invention changes the thermal stability parameters of engine oil by incorporating hydroxyl terminated polyethers with specific molecular weight ranges (100-1500) and structural ratios (m1+m2+m3 between 2-15). These parameter-specific polyethers provide enhanced thermal resistance that prevents deposit formation under the high thermal stress conditions generated by fuel efficiency improvements such as turbocharging and smaller sump sizes.
Solution Approach 2:
The invention replaces conventional high molecular weight polyamine succinimide dispersants with lower molecular weight hydroxyl terminated polyethers that do not form persistent harmful residues. The polyether structure provides effective thermal stress management and deposit control without creating long-lived harmful byproducts, thereby protecting engine components while maintaining fuel efficiency benefits.
3Object-affected harmful factors
If ash-bearing deposit controlling components are used to manage deposits, then deposit control is improved, but after treatment devices are irreversibly poisoned
Solution Approach 1:
The invention fundamentally changes the compositional parameters by eliminating ash-bearing metals and replacing them with metal-free hydroxyl terminated polyether dispersants. This parameter substitution maintains effective deposit control through the polyether's molecular structure while ensuring complete compatibility with after treatment devices by removing the harmful ash-forming components that cause irreversible poisoning.
Solution Approach 2:
The hydroxyl terminated polyether acts as an intermediary substance that provides deposit control functionality without directly interacting with or damaging after treatment devices. The polyether structure serves as a mediator between the engine oil and emission control systems, managing deposits in the engine while leaving the after treatment devices free from harmful ash contamination.
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 dispersant composition effectively reduces deposit formation, improves seal performance, and maintains TBN levels, thereby enhancing engine efficiency and longevity while complying with emissions regulations.
Implementation Method 1
a dispersant composition comprising the reaction product of a polyolefin acylating agent and a hydroxyl terminated polyether
Data Source
AI summary
The disclosed technology relates to a dispersant composition comprising the reaction product of a polyolefin acylating agent and an amine terminated or hydroxyl terminated polyether. In addition, the technology relates to lubricating compositions containing the dispersant composition and an optional synergistic amount of another dispersant, as well as methods of employing the dispersant composition in an engine and engine oils.