Core-Shell Zinc Colloidal Additives for Low-Ash Engine Lubricants
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Solution Overview
Problem
Existing lubricating oil compositions face challenges in providing effective anti-wear performance without increasing phosphorus, sulfur, and ash content, which can degrade catalyst effectiveness and contribute to emissions, while also maintaining fuel economy and engine durability.
Innovation Solution
Incorporation of colloidal particles with a zinc-containing core and a metal surfactant shell, such as salicylates and sulfonates, into lubricating oil compositions to enhance anti-wear properties and contribute to Total Base Number (TBN) without adding phosphorus or sulfur, thereby reducing wear and improving fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ZDDP additives are used to prevent engine wear, then anti-wear performance is improved, but phosphorus and sulfur content increases which degrades catalyst effectiveness and increases emissions
Solution Approach 1:
The patent changes the chemical composition parameters by replacing ZDDP (zinc dialkyl dithiophosphate) with zinc carboxylate compounds that have different elemental composition - specifically zinc-containing additives that do not contribute phosphorus or sulfur to emissions, thereby maintaining anti-wear protection while eliminating harmful emissions
Solution Approach 2:
The patent extracts and removes the harmful phosphorus and sulfur elements from the additive composition by selecting zinc carboxylate compounds that provide necessary anti-wear functionality without these harmful elements, effectively taking out the harmful factors while preserving the protective function
2Use of energy by moving object
If lower viscosity lubricants are used to improve fuel economy, then energy consumption is reduced, but oil film thickness decreases leading to higher wear rates
Solution Approach 1:
The patent changes the physical-chemical parameters of the lubricant by introducing zinc carboxylate additives that enhance boundary lubrication properties, allowing lower viscosity base oils to maintain adequate wear protection through improved adsorption and film formation characteristics
Solution Approach 2:
The patent creates a composite lubricant system combining lower viscosity base oil with zinc carboxylate additives, where the additive component compensates for the reduced film-forming capability of the lower viscosity base oil, achieving both fuel economy and wear protection
3Object-generated harmful factors
If ashless anti-wear agents are used to reduce sulfated ash content, then emissions are reduced, but anti-wear performance may be compromised
Solution Approach 1:
The patent changes the chemical composition by selecting zinc carboxylate compounds that are ashless or low-ash alternatives to conventional sulfur-containing anti-wear additives, maintaining effective wear protection while minimizing sulfated ash formation that would block particulate filters
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 lubricating oil compositions exhibit excellent anti-wear performance, reduced friction, and improved fuel economy, with extended engine durability and compliance with environmental regulations by minimizing catalyst deactivation and emissions.
Implementation Method 1
a shell of metal bound surfactants, such as metal sulfonates, salicylates and/or metal carboxylates
Implementation Method 2
exhibit excellent anti-wear performance, reduced friction
Data Source
Figure 1
Figure 2~4
AI summary
This invention relates to the use of colloids of a core of zinc containing compounds and a shell of metal containing surfactants, such as salicylates and or sulfonates, metal alkanoates, and / or metal carboxylates, as additives in lubricant compositions having good anti-wear properties, especially for engine crankcase applications.