Composition and its utilisation to improve the processability of hydraulic setting compositions

摘要

The polyalkylene glycol has the formula R 1 1-O-(R 1 2-O) x-(R 1 3-O) y-R 1 4. In this formula, R 1 1 is H or C 1- C 2 0 - alkyl, R 1 2 is C 2-C 4- alkylene, R 1 3 is C 2-C 4 alkylene, R 1 4 is H or C 1-C 2 0 - Alkyl, x is 0-500, y is 0-500. x+y is up to 20, the molecular weight M w of the polyalkylene glycol is 2000 to 20,000 g/mol. The liquefier comprises a polymer A with a specified structural formula which is illustrated and defined in the disclosure. The polyalkylene glycol is a polyethylene glycol (PEG), Methoxypolyethylene glycol (MPEG) or a polypropylene glycol (PPG), preferably a polyethylene glycol (PEG). The molecular weight M w of the polyalkylene glycol is 4000-6000 g/mol, preferably 5000-6000 g/mol. The composition is a dispersion, solution or powder. It is an aqueous solution. Further additives are contained, preferably organic solvent or water. The polyalkylene glycol content is preferably 25-40 wt%, based on the dry total weight of the composition. The liquefaction agent amounts to 65-75 wt% on the same basis. A hydraulic binding material (cement) is included. The hardened composition (concrete) is also claimed. An independent claim is included for the method of production by mixing.