| abstract |
The present invention relates to a composition comprising at least: - an ethoxylated fatty alcohol having from 8 to 22 carbon atoms and having an ethoxylation level of from 1 to 10 moles of ethylene oxide per mole of fatty alcohol, - an alkanolamine or a morpholine, or its derivatives or mix of them, and - a fatty acid. The present invention also relates to the use of the composition as an admixture for a hydraulic binder, and to the use of the composition for preventing the formation of a surface film at the surface of a hydraulic binder. The present invention relates also to a hydraulic binder, comprising the composition, and to a process for preventing the formation of a surface film at the surface of hydraulic binders, wherein the composition is added to the dry hydraulic binder. The present invention also relates to a process for preparing the composition, comprising the steps of: a) melting the ethoxylated fatty alcohol and heating it at a temperature above its melting point, b) adding water to the melted ethoxylated fatty alcohol obtained from step a), and mixing, c) adding fatty acid to the mixture obtained from step b), and mixing, d) adding alkanolamine or morpholine, or its derivative or mix of them to the mixture obtained from step c), and mixing, e) adding water, f) thereby obtaining a composition as defined in claim 1. |