Performance additives for improving the wetting properties of ionic liquids on solid surfaces

Abstract

Composition containing at least one ionic liquid and at least one performance additive and if appropriate a solvent and / or of further auxiliaries or additives and its use as wetting agent for solid surfaces.

Description

INCORPORATION BY REFERENCE[0001]This application claims benefit under 35 U.S.C. 119(a) of German patent application DE 102008007745.3, filed on 5 Feb. 2008.[0002]Any foregoing applications, including German patent application DE 102008007745.3, and all documents cited therein or during their prosecution (“application cited documents”) and all documents cited or referenced in the application cited documents, and all documents cited or referenced herein (“herein cited documents”), and all documents cited or referenced in herein cited documents, together with any manufacturer's instructions, descriptions, product specifications, and product sheets for any products mentioned herein or in any document incorporated by reference herein, are hereby incorporated herein by reference, and may be employed in the practice of the invention.FIELD OF THE INVENTION[0003]The invention relates to improving the wetting properties of ionic liquids on solid surfaces.BACKGROUND[0004]Ionic liquids are used...

AI Technical Summary

Benefits of technology

[0011]In addition, only brief contact with the surface to be cleaned occurs in cleaning applications, while in the case of the applications according to the invention lasting or periodically recurring, regular use on the surface occurs. For example, when used in a gearbox, wetting with ionic liquids takes place for at least 95% of the time for which the gearbox is used; conversely, for example, periodic use is ensured when the heat-exchange surface in a falling film distillation process is repeatedly wetted with a thin layer of the ionic liquid, which leads to the spreading action of the ionic liquid and thus contributes to the advantageous effect according to the invention.

[0014]In the case of the performance additives of the invention, it is advantageous if high spreading is associated with good wetting. This may once again be emphasized in contrast to cleaners which are not according to the invention and which require high wetting but do not offer good spreading in addition. In the case of pure ionic liquids which are to be used as lubricants, film formation on the surface to be lubricated is of critical importance. If spreading is also very high, wetting of the surface occurs with formation of a very thin film. This can reduce the concentration of the wetting and spreading agent which is needed and can save costs. In the case of distillative separation processes, too, wetting and spreading of the material being distilled on the evaporator surface is of critical importance. If wetting / spreading is improved, then the liquid film on the evaporator surface becomes thinner and the throughput can be increased.

Problems solved by technology

Ionic liquids often have an unsatisfactory wetting and spreading behavior and therefore prove to be unsuitable despite an excellent property profile because of this deficiency.

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