Condensation products based on amino-s-triazines and the use thereof
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United States of America Patent
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Apr 29, 2003
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N/A
app pub date -
Sep 29, 1997
filing date -
Mar 31, 1995
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Expired
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Abstract
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.degree. 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.degree. C. until the condensation product has a viscosity of 5-50 mm/s at 80.degree. 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.degree. C. The product can be used as an additive for inorganic binders such as cement.
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