Lubricant including water dispersible base

Abstract

A lubricant in the form of an oil-insoluble solvent e.g. water in oil emulsion is described where a water soluble or water dispersible base is present in the dispersed phase. These lubricants are beneficial in various applications such as internal combustion engines where the oil desirable has enough basicity to neutralize any inorganic acids generated by sulfur present in the fuel.

Description

[0001] Lubricants with excess basicity, characterized as total base number (TBN) are used as lubricants in internal combustion engines where atoms such as sulfur, nitrogen and carbon generate acidic combustion products that cause additional wear. In the past the overbased components where bases were reacted in the oil phase with gases like CO.sub.2 contributed basicity. Water soluble or water dispersible bases can offer more neutralization capacity on a weight basis. The bases can be incorporated into an emulsified water phase.BACKGROUND OF INVENTION[0002] A variety of lubricant oils are available having various total base numbers. One reason for having a total base number above zero in a lubricant is that acidic products are more likely to cause corrosion and wear to metal parts of a device than bases, which tend not to be involved in corrosion. Thus lubricants are formulated with sufficient excess base that over their intended lifetime, they remain neutral or slightly basic.[0003]...

AI Technical Summary

Benefits of technology

The patent describes a lubricant with a high level of basicity that can be used in marine diesel engines. The lubricant contains a continuous oil phase, a discontinuous water phase, and a base dissolved or dispersed in the water phase. The base can be added as a solution in a solvent. The lubricant can also contain various conventional lubricating additives such as dispersants, detergents, and viscosity index modifiers. The lubricant can be used in a variety of applications, including marine diesel engines and internal combustion engines. The use of the lubricant can help prevent corrosion and extend the life of the engine parts. The patent also describes a method for emulsifying the oil and water phases using emulsifiers. Overall, the patent provides a technical solution for creating a high-basicity lubricant with improved performance in marine diesel engines.

Problems solved by technology

Due to the high amount of sulfur containing species in the economical residual fuel, the combustion products include high amount of acidic SOX which causes additional wear to the cylinder wall and the rings of the piston.

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