Diester Lubricating Oil for Low-Temperature Fluidity
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Solution Overview
Problem
Conventional lubricating oils face challenges in achieving low viscosity and low volatility simultaneously, leading to issues with durability and performance in varying temperature environments, particularly in small spindle motors and mobile devices.
Innovation Solution
A lubricating oil base oil composition is developed, incorporating diesters with a specific molar ratio and limited branched carbon structures, along with a polyol ester component, to maintain low viscosity and low evaporativity across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the viscosity of lubricating oil is reduced to achieve low torque and good low-temperature fluidity, then the bearing torque decreases and low-temperature startability improves, but the evaporation characteristic deteriorates and durability is reduced
Solution Approach 1:
The invention changes the chemical composition parameters of the base oil by using specific diester compounds with controlled molecular weight distributions and limited branched structures. This achieves the optimal balance between low viscosity for good fluidity and appropriate molecular characteristics for reduced evaporation, resolving the contradiction between ease of operation and reliability
Solution Approach 2:
The invention uses a composite base oil formulation combining specific diester compounds ( formulas 1-3) with controlled ratios. This composite approach allows the lubricating oil to exhibit both low viscosity for good low-temperature fluidity and enhanced evaporation resistance through the synergistic effect of multiple components with different molecular characteristics
2Ease of operation
If the molecular weight of lubricating oil is decreased to reduce viscosity, then the low-temperature fluidity improves, but the volatility increases and evaporation occurs
Solution Approach 1:
The invention optimizes the molecular weight distribution parameters by selecting diester compounds with specific carbon atom counts (C16-C30) and controlling the proportion of branched structures. This parameter optimization achieves low viscosity through appropriate molecular weight while simultaneously reducing volatility by avoiding excessively low molecular weights that would increase evaporation
Solution Approach 2:
The invention applies local quality control by specifically limiting the proportion of highly branched structures in the molecular configuration. The diester compounds have controlled branching (formulas 1-3) that provides low-temperature fluidity through reduced intermolecular forces while maintaining sufficient molecular weight to prevent excessive evaporation, achieving different quality requirements in different molecular regions
3Ease of operation
If the ratio of branched structures in diesters is increased to improve low-temperature fluidity, then the viscosity at low temperature decreases, but the viscosity index becomes small and evaporativity increases
Solution Approach 1:
The invention changes the structural parameters of the diester molecules by controlling the ratio of branched to linear carbon structures. The specific formulas (1-3) define precise branching patterns where methyl and ethyl groups are limited to 11% or less of total carbon atoms. This parameter control achieves adequate low-temperature fluidity while maintaining low evaporativity by avoiding excessive branching that would increase volatility
Data Source
AI summary
Provided are a lubricating oil base oil having characteristics of low volatility and excellent low-temperature fluidity and capable of providing long-lasting lubrication property in a wide temperature range from low temperature to high temperature, and a lubricating oil composition using the same. The lubricating oil base oil includes a diester obtained through a reaction between a diol component formed of 1,12-dodecanediol and a carboxylic acid component formed of 2-methylpentanoic acid or 2-methylpentanoic acid and 2-ethylhexanoic acid. The diester is represented by R2COOR1OOCR3, where R1 represents an alkylene derived from the diol component and R2 and R3 each represent an alkyl derived from the carboxylic acid component, and includes 45 to 100 mol % of a diester in which both of R2 and R3 represent C5 alkyls.