Lube Base Oil Viscosity Index and Oxidation Stability
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Solution Overview
Problem
Conventional lubricating base oils are inadequate in terms of viscosity-temperature characteristics and heat and oxidation stability, and the addition of additives only provides limited improvement, making it difficult to achieve high viscosity index and low temperature viscosity without using synthetic or low-viscosity mineral oils, which increases production costs and reduces performance.
Innovation Solution
A lubricating base oil with a saturated component content of 90% or greater, a viscosity index of 110 or higher, and an iodine value of not greater than 2.5, characterized by a specific ratio of monocyclic to bicyclic saturated components, and an aromatic content of 0.1-7%, which allows for excellent viscosity-temperature characteristics and heat and oxidation stability, enabling high additive functionality and reduced energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lubricating base oils are used with additive addition, then heat and oxidation stability is improved, but viscosity-temperature characteristics remain inadequate and production costs increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chemical composition parameters of the base oil: saturated component content (90-100%), aromatic component content (0.1-10%), and specific ratios of monocyclic to bicyclic saturated components. This compositional parameter optimization achieves both excellent viscosity-temperature characteristics (viscosity index ≥110) and superior heat/oxidation stability without requiring expensive synthetic oils or excessive additive packages.
Solution Approach 2:
The patent creates a composite base oil material by combining specific hydrocarbon components in optimized proportions: saturated hydrocarbons (90-100%), aromatic hydrocarbons (0.1-10%), with controlled ratios of monocyclic and bicyclic structures. This composite approach synergistically achieves both low-temperature fluidity and high-temperature stability that neither component alone could provide, eliminating the need for synthetic oil blends.
2Use of energy by moving object
If viscosity of lubricating oil is reduced to lower stirring resistance and friction resistance, then fuel efficiency is improved, but lubricity (wear resistance, fatigue life) deteriorates
Solution Approach 1:
The patent changes the molecular structure parameters of the base oil by controlling the ratio of monocyclic to bicyclic saturated components and limiting aromatic content. This structural optimization enables the oil to maintain adequate viscosity at operating temperatures while ensuring low-temperature pumpability, achieving both fuel efficiency through reduced stirring resistance and adequate lubricity through optimized molecular architecture without requiring excessive extreme-pressure additives.
3Manufacturing precision
If synthetic oils or low-viscosity mineral oils are used to achieve high viscosity index and low temperature viscosity, then viscosity-temperature characteristics are improved, but production costs increase
Solution Approach 1:
The patent achieves high viscosity index (≥110) and low temperature viscosity characteristics through parameter optimization of conventional mineral oil composition rather than using expensive synthetic oils. By controlling saturated component content (90-100%), aromatic content (0.1-10%), and the specific ratio of monocyclic to bicyclic saturated components, the invention attains synthetic-oil-level performance from refined mineral oil at lower production cost.
Data Source
AI summary
The present invention provides a lubricating base oil comprising saturated components of 90% by mass or greater, wherein the proportion of cyclic saturated components among the saturated components is not greater than 40% by mass, and by having a viscosity index of 110 or higher and an iodine value of not greater than 2.5. The lubricating base oil of the invention exhibits excellent viscosity-temperature characteristics and heat and oxidation stability while also allowing additives to exhibit a higher level of function when additives are included. The lubricating base oil of the invention is suitable for use in various lubricating oil fields, and is especially useful for reducing energy loss and achieving energy savings in devices in which the lubricating base oil is applied.