Low-Ash Lubricating Oil Composition for Catalyst-Safe Wear Protection
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Solution Overview
Problem
Phosphorus-containing anti-wear agents in lubricating oils accumulate in catalytic converters, reducing their efficiency and life, necessitating a reduction in phosphorus content while maintaining wear and corrosion protection.
Innovation Solution
A lubricating oil composition comprising a major amount of lubricating viscosity oil, a detergent system with magnesium- and calcium-containing detergents, and boron-containing additives, with minimal zinc and phosphorus, achieving a total sulfated ash content of 0.30-0.80 wt.% and a total base number of 4.0-9.5 mg KOH/g, using boron and molybdenum compounds for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphorus-containing anti-wear agents are used in lubricating oils, then wear and corrosion protection is improved, but phosphorus accumulates in catalytic converters reducing their efficiency and life
Solution Approach 1:
The patent removes phosphorus-containing anti-wear agents from the lubricating oil composition entirely, replacing them with zinc dithiophosphate and boron-containing additives. This extraction of the harmful phosphorus component eliminates catalytic converter contamination while maintaining wear and corrosion protection through alternative additive systems.
Solution Approach 2:
The patent changes the chemical composition parameters by limiting phosphorus content to less than 50 ppm and introducing specific concentrations of zinc (50-500 ppm) and boron (100-300 ppm) additives. These parameter changes enable the oil to provide adequate anti-wear protection without phosphorus accumulation in the catalytic converter.
2Object-generated harmful factors
If phosphorus content is reduced in lubricating oils, then catalytic converter efficiency is maintained, but wear and corrosion protection may be insufficient
Solution Approach 1:
The patent introduces zinc dithiophosphate and boron-containing additives as intermediary substances that mediate between the need for wear protection and catalytic converter protection. These intermediaries provide the necessary anti-wear functionality without the harmful phosphorus content, bridging the gap between conflicting requirements.
Solution Approach 2:
The patent creates a composite additive system combining zinc dithiophosphate, boron-containing additives, and magnesium/calcium detergents. This composite formulation achieves synergistic effects where the combination of multiple additives provides superior wear and corrosion protection while maintaining low phosphorus content for catalytic converter compatibility.
3Duration of action of stationary object
If zinc and phosphorus are minimized in lubricating oils, then catalytic converter life is extended, but detergent and anti-wear performance must be maintained through alternative systems
Solution Approach 1:
The patent segments the additive package into distinct functional components: zinc dithiophosphate for anti-wear protection, boron-containing additives for corrosion inhibition, and magnesium/calcium detergents for cleanliness. This segmentation allows each component to be optimized for its specific function while collectively achieving the desired performance without phosphorus.
Solution Approach 2:
The patent employs multi-functional additives that perform multiple roles. For example, the detergent system comprising magnesium and calcium compounds provides both cleaning functions and contributes to wear protection, reducing the need for separate specialized additives and simplifying the overall formulation despite the phosphorus restriction.
Data Source
AI summary
A low ash lubricating oil composition is described. The composition includes major amount of an oil of lubricating viscosity, detergent system, and boron-containing additive in an amount to provide at least 100 ppm of boron to the lubricating oil composition. The detergent system includes one or more magnesium-containing detergent and optionally, one or more calcium- containing detergent. The lubricating oil composition is free of zinc and phosphorus. The total sulfated ash content of the lubricating oil composition is from 0.30 wt.% to 0.80 wt.%. The total base number of the lubricating oil composition is from 4.