Urea Thickener Grease for High-Temperature Automotive Bearings
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Solution Overview
Problem
Conventional greases for automotive electrical equipment and auxiliaries fail to provide sufficient heat resistance and lubrication life, especially in high-temperature environments with reduced size and weight requirements.
Innovation Solution
A grease composition comprising a urea compound as a thickener and a base oil with specific branched alkyl groups, where the base oil is obtained through an addition reaction of diphenyl ether with a branched α-olefin, optimizing the ratio of quaternary carbon atoms for enhanced heat resistance and lubrication life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the engine room is sealed to reduce noise, then quietness is improved, but the temperature in the operating environment becomes high
Solution Approach 1:
The patent converts the harmful effect of high temperature (caused by sealing the engine room for noise reduction) into a manageable condition by selecting base oil compounds with exceptional thermal stability. The specific ADE compounds and antioxidant system transform the high-temperature environment from a damaging condition into an acceptable operating range, maintaining lubrication effectiveness despite the elevated temperatures.
2Weight of moving object
If the size and weight of automotive electrical equipment are reduced, then space and weight requirements are met, but the grease must maintain performance in more constrained conditions
Solution Approach 1:
The patent optimizes the physical and chemical parameters of the grease components to maintain performance in smaller, lighter equipment. The specific molecular weight ranges and structural parameters of the ADE base oil ensure adequate viscosity and film strength even in miniaturized bearing applications, resolving the contradiction between reduced equipment size and maintained grease performance.
Data Source
AI summary
The invention provides a grease composition containing a urea thickener represented by formula (1): R1-NHCONH-R2-NHCONH-R3 (1) (wherein R2 is a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms; and R1 and R3, which may be the same or different from each other, represent an alkyl group having 8 to 22 carbon atoms, cyclohexyl group or an aryl group having 6 to 12 carbon atoms); and a base oil containing at least one compound represented by formula (3): (wherein R6 and R7, which may be the same or different from each other, represent a branched alkyl group having 10 to 26 carbon atoms, with the ratio of the number of moles of the alkyl groups represented by R6 and R7 where the carbon atom attached to the phenyl ring is a quaternary carbon atom being 40 to 95 mol% with respect to the total number of moles of the branched alkyl groups; and m and n are real numbers of 0 or more so as to satisfy the condition of 1.0≤m+n≤3.0).