High-Viscosity Lubricant Blends for Low-Temperature Flow
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Solution Overview
Problem
Lubricants degrade under extreme temperature conditions, leading to reduced performance and increased maintenance costs due to the need for frequent replacements, especially in hard-to-reach locations like offshore turbines.
Innovation Solution
Development of Group II high viscosity base stocks with enhanced properties, such as high saturates content, low aromatics, and specific viscosity indices, combined with additives to create lubricants that resist deposit formation and maintain performance in low and oxidizing environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lubricants are used in extreme temperature conditions, then they provide basic lubrication, but they oxidize and degrade leading to reduced performance and frequent replacements
Solution Approach 1:
The patent changes the chemical composition parameters of the base stock by specifying saturates content of at least 84 wt%, aromatics content of no more than 10 wt%, and sulfur content of no more than 0.03 wt%. These parameter changes improve oxidation resistance while maintaining service life.
Solution Approach 2:
The patent creates a composite lubricant formulation combining a specifically composed Group II base stock with viscosity index improvers, anti-wear additives, and oxidation inhibitors. This composite approach provides synergistic effects that extend service life and improve reliability under extreme temperature conditions.
2Strength
If high viscosity base stocks are used to maintain lubrication at high temperature, then they provide adequate film strength, but they become too thick to pump at low temperature
Solution Approach 1:
The patent specifies a viscosity index of at least 80, which indicates the lubricant's viscosity remains relatively stable across a wide temperature range. This dynamic viscosity characteristic allows the lubricant to maintain adequate film strength at high temperature while remaining pumpable at low temperature, resolving the contradiction between these two requirements.
3Reliability
If lubricants are frequently replaced to maintain performance, then machine performance is maintained, but productivity is lost due to downtime and maintenance costs
Solution Approach 1:
The patent incorporates oxidation inhibitors and stabilizers in the lubricant formulation before use, which preemptively protect against degradation. This preliminary protective action extends the service life of the lubricant, allowing longer intervals between replacements and thereby maintaining productivity by reducing downtime.
4Ease of operation
If conventional base stocks with aromatics are used, then they provide good low temperature flow, but they form deposits when exposed to oxygen and high temperature
Solution Approach 1:
The patent changes the compositional parameters by limiting aromatics to no more than 10 wt% while maintaining saturates at no less than 84 wt%. This parameter change reduces deposit formation tendency while the viscosity index of at least 80 ensures adequate low temperature flow characteristics are maintained.
Data Source
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AI summary
A method for producing a deposit resistant fluid includes combining a base stock and one or more additives to form a blended fluid configured to maintain fluidity in a low temperature environment and to resist forming deposits in an oxidizing environment. The base stock has a viscosity index of at least 80, and either a kinematic viscosity at 40 °C of at least 320 cSt or a kinematic viscosity at 100 °C of at least 14 cSt. The base stock includes greater than or equal to about 90 wt% saturates, less than or equal to about 10 wt% aromatics, and a sum of terminal/pendant propyl groups and terminal/pendant ethyl groups of at least 1.7 per 100 carbon atoms.