Lubricant Composition High-Temperature Durability
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Solution Overview
Problem
Conventional greases fail to maintain lubrication and prevent sticking in powertrain parts under high-temperature and high-load conditions, leading to oil separation and contamination issues.
Innovation Solution
A lubricant composition comprising 60-90% base oil, 5-35% thickener, and 2-7% thickener supplement, with a polypropylene/ceresin ratio of 0.40-2.35, including a metal compound and additives like Zn-based antioxidants, is developed to inhibit oil separation and maintain friction characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional grease is used under high-temperature conditions, then the lubricant provides basic lubrication, but the oil separates, evaporates, and hardens causing sticking phenomenon
Solution Approach 1:
The patent uses a composite thickener system combining lithium complex soap (5-35 wt%) with polypropylene (1-10 wt%) and/or ceresin (1-10 wt%). This composite structure creates a more stable grease matrix that resists oil separation and evaporation at high temperatures, while maintaining lubrication properties. The combination of different thickener types with complementary properties solves the contradiction between reliability and compositional stability.
Solution Approach 2:
The patent modifies the chemical composition parameters of the thickener system by introducing specific ratios of polypropylene to ceresin (0.1 to 5.0 weight ratio) and controlling the content of lithium complex soap within specific ranges. These parameter changes optimize the grease's high-temperature stability, preventing oil separation and evaporation while maintaining reliable lubrication under harsh conditions.
2Object-affected harmful factors
If grease is used to prevent leakage and contamination, then it provides strong adsorption capability, but under high-temperature and high-load conditions it fails to maintain friction characteristics
Solution Approach 1:
The patent employs a composite thickener system that combines the strong adsorption capability of lithium complex soap with the high-temperature stability of polypropylene and/or ceresin. This composite structure maintains both contamination prevention and reliable friction characteristics under high-load conditions, as each component contributes its strengths to the overall grease performance.
Solution Approach 2:
The patent creates different functional zones within the grease structure: the lithium complex soap provides strong adsorption and contamination prevention at the metal surface, while the polypropylene and/or ceresin components maintain structural integrity and friction characteristics under high-temperature and high-load conditions. This local differentiation of functions resolves the contradiction between contamination prevention and friction stability.
3Reliability
If thickener content is increased to reduce oil separation, then durability improves, but the grease may become too thick affecting flow properties
Solution Approach 1:
The patent optimizes the thickener content parameters by controlling lithium complex soap at 5-35 wt% and polypropylene/ceresin at 1-10 wt%, with a specific polypropylene to ceresin weight ratio of 0.1 to 5.0. These parameter changes achieve the right balance between oil separation resistance and flow properties, ensuring the grease remains operable while providing enhanced durability.
Solution Approach 2:
The composite thickener system allows for distributed functionality: lithium complex soap provides the base thickening and adsorption, while smaller amounts of polypropylene and/or ceresin enhance high-temperature stability without excessive thickening. This composite approach achieves oil separation resistance while maintaining acceptable flow properties better than a single thickener system could provide.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The lubricant composition effectively reduces high-temperature evaporation and oil separation, maintaining friction characteristics and increasing durability of powertrain parts by preventing sticking and contamination.
Implementation Method 1
the oil separates, evaporates, and hardens, which leads to a sticking phenomenon
Implementation Method 2
Grease is a sticky lubricant in which soap is mixed in mineral oil, and, compared to liquid lubricant, is characterized by low leakage, strong adsorption capability and self-sealing function
Implementation Method 3
strong adsorption capability and self-sealing function, thereby making penetration of dust, water, solid matter, gas, etc. therein difficult
Data Source
AI summary
The present disclosure relates to a lubricant composition including a base oil, a thickener and a thickener supplement, and a method of manufacturing the same. The lubricant composition of the present disclosure is effective at improving performance at high-temperature by maintaining the evaporation amount and friction characteristics even at high temperatures, thus inhibiting oil contamination of powertrain parts and the like and maintaining sticking phenomenon even in a high-temperature environment, thereby increasing the durability of parts.