Borated Salicylate Detergent for Stable High Boron Loading
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Solution Overview
Problem
Boron-containing detergents in lubricant formulations often create instabilities and have inaccessible boron, making it difficult to achieve high boron loadings while maintaining formulation stability, especially when combined with salicylate detergents and organic friction modifiers.
Innovation Solution
An overbased alkaline earth metal hydrocarbyl-substituted salicylate detergent with both carbonate and borate moieties is developed, which includes a method of boration to achieve high boron loadings that are both accessible and package/formulation stable, using a specific process involving an oil-soluble or oil-dispersible detergent and a boron source in an organic diluent medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high boron loadings are introduced into lubricant formulations using boron-containing detergents, then boron availability for tribofilm formation is improved, but formulation stability deteriorates due to interactions with salicylate detergents and organic friction modifiers
Solution Approach 1:
The patent applies parameter changes by carefully controlling the boration process parameters (temperature, time, boron source concentration) and detergent properties (basicity index, soap content, hydrocarbyl substitution) to achieve high boron loadings while maintaining formulation stability. The specific ranges of basicity index (3.8-9.0), soap content (55-300 mmol/kg), and mass ratio of borate to carbonate (0.75-6.0) are optimized parameters that resolve the contradiction between boron availability and formulation stability.
Solution Approach 2:
The patent creates a composite detergent structure combining carbonate and borate moieties within the same molecular framework. This composite approach allows the detergent to simultaneously provide high boron content for tribofilm formation and maintain stability through the carbonate component, while the specific composite structure (overbased alkaline earth metal hydrocarbyl-substituted salicylate) prevents harmful interactions with other additives.
2Quantity of substance
If boron-containing dispersants are used to achieve high boron loadings, then boron mobility to lubrication surface is improved, but viscometric impact on basestock deteriorates particularly at lower viscosities
Solution Approach 1:
The patent controls the detergent parameters (basicity index, soap content, hydrocarbyl chain length C14-C24) to optimize the balance between boron loading and viscometric impact. The specific parameter ranges ensure that while high boron loadings are achieved, the detergent maintains appropriate lubricity and does not cause excessive thickening or viscosity degradation, particularly in low-viscosity formulations.
3Quantity of substance
If conventional boron introduction methods are used, then boron content is improved, but boron accessibility and activity deteriorate due to inaccessible/inactive boron in practice
Solution Approach 1:
The patent fundamentally changes the chemical structure of the detergent to ensure boron accessibility. By incorporating borate moieties with specific mass ratios (0.75-6.0) relative to carbonate, and controlling the basicity index and soap content, the patent ensures that boron remains chemically active and accessible for tribofilm formation rather than being locked in inactive forms, thereby improving reliability of boron performance.
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 solution results in a boron-containing detergent that maintains stability and effectiveness in additive package concentrates and formulations, ensuring accessible boron is retained and mobile to form a tribofilm, improving lubricant performance without significant viscometric impact.
Implementation Method 1
The reaction mixture is heated to a temperature above 100° C. (e.g., from 105° C. to 225° C.) at a heating rate below 3° C./min in a borating process to form a crude borated detergent product.
Implementation Method 2
ensuring accessible boron is retained and mobile to form a tribofilm, improving lubricant performance without significant viscometric impact
Data Source
AI summary
Disclosed herein is an overbased alkaline earth metal hydrocarbyl-substituted salicylate detergent comprising both carbonate and borate moieties and exhibiting the following characteristics: a basicity index of at least 3.8; a ratio of soap content to mass % boron is greater than 55 mmol/kg; a soap content of at least 330 mmol/kg; a TBN, measured according to ASTM D2896, of at least 220 mg KOH/g; and a mass ratio of borate to carbonate from 0.75 to 6.0, wherein the alkaline earth metal comprises calcium and/or magnesium, and the hydrocarbyl substitution comprises 9 to 30 carbon atoms. Methods of making the boron-containing salicylate detergent, specifically to be package-stable, are also disclosed, as well as package-stable lubricant additive package concentrates and lubricating oil compositions containing same.