Lubricating Oil Composition Oxidation Stability Sludge Control
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Solution Overview
Problem
Turbine oils face limitations in improving oxidation stability and tend to form sludge when increasing the amount of amine-based antioxidants, which hinders their prolonged use.
Innovation Solution
A lubricating oil composition is developed by blending a benzotriazole compound with a sorbitan compound along with 2,6-di-tert-butylphenol, enhancing oxidation stability while minimizing sludge formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of amine-based antioxidant is increased to improve oxidation stability, then oxidation stability is improved, but sludge formation increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific mixture ratio of benzotriazole compound (0.01-5 wt%) and sorbitan compound (0.01-5 wt%) alongside phenol-based antioxidant (0.1-5 wt%), replacing the conventional approach of simply increasing amine-based antioxidant dosage. This parameter change achieves improved oxidation stability while controlling sludge formation through synergistic interaction of multiple additives at optimized concentrations.
Solution Approach 2:
The patent creates a composite antioxidant system combining three different types of compounds: phenol-based antioxidant, benzotriazole compound, and sorbitan compound. This composite approach leverages the complementary mechanisms of each component - phenol for radical scavenging, benzotriazole for metal corrosion inhibition and oxidation prevention, and sorbitan for emulsification and sludge control - achieving superior oxidation stability without excessive sludge formation that would result from using a single antioxidant type at high concentrations.
2Reliability
If the amount of phenol-based antioxidant is increased to improve oxidation stability, then oxidation stability is improved, but there is a limit to further improvement
Solution Approach 1:
The patent merges phenol-based antioxidant with benzotriazole compound and sorbitan compound in a specific formulation. The phenol-based antioxidant (0.1-5 wt%) provides baseline oxidation protection, while the benzotriazole compound (0.01-5 wt%) adds metal corrosion inhibition and enhanced oxidation stability, and the sorbitan compound (0.01-5 wt%) contributes emulsification and sludge prevention. This merging of multiple functional components overcomes the diminishing returns encountered when simply increasing phenol-based antioxidant dosage alone.
Solution Approach 2:
The patent optimizes the concentration parameters of each component in the antioxidant system. Rather than maximizing phenol-based antioxidant alone, the formulation specifies optimal ranges: phenol-based antioxidant (0.1-5 wt%), benzotriazole compound (0.01-5 wt%), and sorbitan compound (0.01-5 wt%). This multi-parameter optimization enables synergistic effects that push oxidation stability beyond the limits achievable with phenol-based antioxidant alone, while maintaining cost-effectiveness and avoiding excessive additive packaging.
3Duration of action of stationary object
If conventional antioxidant formulations are used to prolong turbine oil lifetime, then some oxidation stability is achieved, but lifetime prolongation is not always attained
Solution Approach 1:
The patent employs a composite antioxidant formulation combining phenol-based antioxidant, benzotriazole compound, and sorbitan compound. This composite system provides multi-mechanism protection: phenol for radical scavenging, benzotriazole for metal surface protection and oxidation inhibition, and sorbitan for maintaining additive solubility and preventing sludge deposition. The synergistic interaction of these components delivers sustained oxidation stability and rust prevention over extended turbine oil service life, exceeding the performance of conventional single-or dual-component formulations.
Solution Approach 2:
The sorbitan compound acts as an intermediary in the antioxidant system, facilitating the interaction between phenol-based antioxidant and benzotriazole compound. Sorbitan's amphiphilic nature helps solubilize the additives, ensures uniform distribution throughout the turbine oil, and prevents premature separation or sludge formation. This intermediary role of sorbitan maintains the integrity of the antioxidant system over time, ensuring consistent protection and prolonging turbine oil lifetime beyond what would be achievable with direct mixing of phenol and benzotriazole alone.
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 composition achieves improved oxidation stability and rust-preventive performance with controlled sludge formation, effectively prolonging the lifespan of turbine oils.
Implementation Method 1
the oxidation stability of a lubricating oil composition can be improved
Implementation Method 2
improved oxidation stability and rust-preventive performance
Data Source
AI summary
The lubricating oil composition of the present invention contains a base oil, a 2,6-di-tert-butylphenol (A), and at least one compound (B) selected from a benzotriazole compound and a sorbitan compound.