WETTING AGENT FOR OFFSET PRINTING WETTING WATER FOR OFFSET PRINTING MACHINES

摘要

The invention relates to a fountain solution or a fountain water for use in offset printing. By the invention, the corrosion, in particular on the nickel-coated parts, especially on the nickel-coated printing cylinders of the printing machines, is greatly reduced, especially seen over a relatively long period. The fountain solution consists essentially of viscosity-controlling hydrophiling agents, buffer substances and, if appropriate, solubilisers, wetting agents, foam inhibitors and biocides and it is characterised in that it contains a combination of at least one triazole and at least one non-hydroxylated dicarboxylic acid and, if appropriate, its salts. The fountain solution preferably contains additionally an ammonium salt of the general formula RnHmN+X-, in which n is 1-4, m is 0-3, (n + m) is 4 and R is alkyl and/or aryl, preferably alkyl. For an additional corrosion inhibition for iron parts, a phosphoric acid, preferably orthophosphoric acid, and/or its salts is additionally added to the fountain solution. …IMAGE…