Vegetable Oil-Based Lubricant Composition for Oxidation Stability
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Solution Overview
Problem
Existing lubricating oil compositions using vegetable oils as base oils lack investigation on additive formulations, particularly in terms of oxidation stability.
Innovation Solution
A lubricating oil composition comprising a vegetable oil with limited linoleic and linolenic acid content, zinc dithiophosphate, and an amine-based antioxidant, optionally with a phosphorus-free phenol-based antioxidant, to enhance oxidation stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vegetable oil is used as a base oil for lubricating oil, then environmental friendliness and carbon neutrality are improved, but oxidation stability is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the base oil by selecting vegetable oils with specific fatty acid profiles (low linoleic and linolenic acid content, high oleic acid content), and adjusts additive concentrations (amine-based antioxidant at 2.00 mass% or more, phosphorus-free phenol-based antioxidant at less than 2.00 mass%) to achieve both environmental friendliness and oxidation stability
Solution Approach 2:
The patent creates a composite lubricating oil system by combining vegetable oil base stock with specific additives (zinc dithiophosphate, amine-based antioxidant, and phosphorus-free phenol-based antioxidant) in defined proportions, where the synergistic interaction between components achieves both eco-friendliness and oxidation resistance
2Strength
If vegetable oil with high unsaturated fatty acid content is used, then lubricity is improved, but oxidation stability deteriorates
Solution Approach 1:
The patent optimizes the fatty acid composition parameters by limiting linoleic acid and linolenic acid content to less than 20 mass% total, while maintaining adequate oleic acid content for lubricity, and adjusts antioxidant additive levels to compensate for the reduced unsaturation
Solution Approach 2:
The patent introduces amine-based antioxidants and phosphorus-free phenol-based antioxidants as intermediary substances that mediate between the base oil and oxidative environment, protecting the vegetable oil from oxidation while maintaining its inherent lubricating properties
Data Source
AI summary
Provided is a lubricating oil composition, including: a vegetable oil (A); a zinc dithiophosphate (B); and an amine-based antioxidant (C), wherein a total content of linoleic acid and linolenic acid among constituent fatty acids of the vegetable oil (A) is less than 20 mass % with respect to a total amount of the constituent fatty acids in the vegetable oil (A), wherein a content of the amine-based antioxidant (C) is 2.00 mass % or more with respect to a total amount of the lubricating oil composition, and wherein when the lubricating oil composition further includes a phosphorus-free phenol-based antioxidant (D), a content of the phosphorus-free phenol-based antioxidant (D) is less than 2.00 mass % with respect to the total amount of the lubricating oil composition.