Compound comprising polyamine, carboxylate and boron functionalities and its use as a lubricant additive

Abstract

A product resulting from the reaction of at least: an alkali or alkaline earth metal hydroxybenzoate compound, optionally substituted by a hydrocarbyl group and optionally overbased, a boron compound, an amine component selected from a di-fatty-alkyl(ene) polyalkylamine composition including one or more polyalkylamines of formulae (I) or (II). A lubricant composition including this product. Use of this product as a lubricant for two-stroke marine engines and four-stroke marine engines, more preferably two-stroke marine engines.

Description

[0001]The invention is directed to the reaction product of an alkali or alkaline earth salt of an acidic organic compound, a boron compound and an amine component. It is also directed to a lubricant composition comprising this reaction product, a method for its production and its uses.STATE OF THE ART[0002]One of the primary functions of lubricants is to decrease friction. Frequently, however, lubricating oils need additional properties to be used effectively. For example, lubricants used in large diesel engines, such as, for example, marine diesel engines, are often subjected to operating conditions requiring special considerations.[0003]The marine oils used in low-speed two-stroke crosshead engines are of two types. On the one hand, cylinder oils ensuring the lubrication of the cylinder-piston assembly and, on the other hand, system oils ensuring the lubrication of all the moving parts apart from the cylinder-piston assembly. Within the cylinder-piston assembly, the combustion res...

AI Technical Summary

Benefits of technology

The invention is about a new lubricant composition that is suitable for use in marine engines. The composition includes a reaction product of an alkali or alkaline earth metal hydroxybenzoate compound, a boron compound, and an amine component. The amine component is a polyalkylamine composition that contains at least 3% by weight of branched compounds. The composition also includes a base oil. The use of this lubricant composition has been found to improve fuel efficiency and reduce emissions in marine engines.

Problems solved by technology

Moreover, each of these lubricants has limits of use resulting from the following observations: the use of a high BN cylinder lubricant in the presence of a fuel oil with a low sulphur content (0.1 w / w) and at a fixed lubrication level, creates a significant excess of basic sites (high BN) and a risk of destabilization of the micelles of unused overbased detergent, which contain insoluble metallic salts.

This destabilization results in the formation of deposits of insoluble metallic salts (for example calcium carbonate), mainly on the piston crown, and can eventually lead to a risk of excessive wear of the liner-polishing type.

Further, the use of a low BN cylinder lubricant is not sufficient in term of total neutralization capacity in the presence of a fuel oil with a high sulphur content and thus can cause an important risk of corrosion.

This optimization reduces the flexibility of operation of the engine and requires a significant degree of technical expertise on the part of the crew in defining the conditions under which the switching from one type of lubricant to the other must be carried out.

However, for some of those compounds, increasing the amount of additive in the lubricating oil increases oil viscosity while neutralization occurs, thus degrading the lubricating efficacy.

Other compounds have proven satisfactory with regards to the control of oil viscosity increase but are less satisfactory with regards to detergency performance.

Other compounds have also proven satisfactory with regards to the performance of detergency but are less satisfactory with regards to oil viscosity increase while neutralisation occurs.

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