Skw Trostberg Aktiengesellschaft

Skw Polymers Gmbh

Aloisia Stadler

Alfred Kern

Josef Weichmann

In the proposed condensation product based on amino-s-triazines with at least two amino groups, formaldehyde and sulphite, the molar ratio of amino-s-triazine, formaldehyde and sulphite is 1:2.5-6.0:1.51-2.0 and the formiate content is less than 0.3 wt %. The condensation product is obtained by a) heating amino-s-triazine, formaldehyde and a sulphite in the molar ratio 1:2.5-6.0:1.51-2.0 in an aqueous solution at a temperature of 60-90&deg; C. and a pH level of between 9.0 and 13.0 until the sulphite can no longer be detected; b) continuing the condensation at a pH level of between 3.0 and 6.5 and a temperature of 60-80&deg; C. until the condensation product has a viscosity of 5-50 mm/s at 80&deg; C.; and c) adjusting the pH level of the condensation product to 7.5-12.0 or carrying out thermal secondary treatment at a pH level of >10.0 and a temperature of 60-100&deg; C. The product can be used as an additive for inorganic binders such as cement.

Condensation products based on amino-s-triazines and the use thereof

Disclosed is a flow improving agent for binder suspensions containing cement which is composed of a) amino-s-triazine-formaldehyde-sulfite condensation products having a molar ratio of amino-s-triazine:formaldehyde:sulfite of 1:1.3 to 6.0: 0.3 to 1.5 and a low content of free formaldehye as well as b) casein. The flow improving agents have the advantage that the flowability is considerably improved compared to casein (alone) for example and the increased flowability remains constant even over a longer time period.

Growing community of inventors

Tacherting, Germany

Aloisia Stadler