Composite Ester Lubricant Base Oil for High Traction and Flash Point
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Solution Overview
Problem
Lubricant base oils for traction drives face challenges in achieving high traction coefficients and high flash points while maintaining excellent low-temperature fluidity, particularly as the size of traction drives increases, leading to heat generation issues.
Innovation Solution
The development of a lubricant base oil comprising specific compounds represented by formula (1), where R1 to R5 are hydrogen atoms or C1-4 linear or branched alkyl groups, and X is a divalent group obtained by removing hydroxyl groups from a C4-12 branched aliphatic diol, providing a high traction coefficient and high flash point with excellent low-temperature fluidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alicyclic hydrocarbon compounds are used to achieve high traction coefficient, then power transmission performance is improved, but flash point becomes low (200°C or below) compromising heat resistance and safety
Solution Approach 1:
The invention uses composite ester compounds formed by combining specific diols (neopentyl glycol, 2,2-diethyl-1,3-propanediol) with specific carboxylic acids (cyclohexanecarboxylic acid, methylcyclohexanecarboxylic acid) to create a lubricant base oil that achieves both high traction coefficient and high flash point, resolving the contradiction between these two properties
Solution Approach 2:
The invention changes the chemical parameters of the lubricant base oil by selecting specific molecular structures with controlled carbon numbers (C12-C20) and specific ester compositions, thereby achieving both high traction coefficient and high flash point simultaneously
2Power
If traction drive size is increased to increase power transmission, then power transmission capability is improved, but heat generation increases
Solution Approach 1:
The invention changes the thermal parameters of the lubricant by selecting ester compounds with high flash points (200°C or above) and controlled viscosity, thereby enabling the system to handle higher power transmission while controlling heat generation effects
3Temperature
If lubricant base oil is designed for high flash point to improve heat resistance, then safety and heat resistance are improved, but low-temperature fluidity may deteriorate
Solution Approach 1:
The invention optimizes specific local molecular characteristics by selecting diols with specific structures (neopentyl glycol, 2,2-diethyl-1,3-propanediol) that provide both high flash point and good low-temperature fluidity, achieving localized optimization of contradictory properties
Solution Approach 2:
The invention carefully controls molecular parameters including carbon number (C12-C20), ester composition ratios, and molecular weight to achieve the optimal balance between high flash point and low-temperature fluidity
Data Source
AI summary
An object of the present invention is to provide a lubricant base oil for power transmission that has a high traction coefficient and a high flash point, and excellent low-temperature fluidity. The present invention relates to a lubricant base oil for power transmission containing a compound represented by formula (1):wherein R1 to R5 are the same or different, and each represents a hydrogen atom or a C1-4 linear or branched alkyl group,any two of R1 to R5 may bind to each other to form a C1-4 alkylene group, two R1s, two R2s, two R3s, two R4s, and two R5s may be individually the same or different, X is obtained by removing two hydroxyl groups from a C4-12 branched aliphatic diol and represents a divalent group containing no quaternary carbon, and the two hydroxyl groups are each of a primary alcohol.