Alkaline stripping solns. contg. amine accelerators - for stripping protective and/or decorative organic coatings from surfaces

摘要

The accelerators are (A) alkanolamines of formula (I) R1R2N-R'-OH (I) (where R' is alkyl with up to 4C atoms; R1 and R2 are H, alkyl, aryl or hydroxyalkyl) e.g. phenyldiethanol, associated with (B) a synergic amt. of a different amine selected from mono-, di. or tri-ethanolamine, melamine, 2-(2-aminoethoxy)-ethanol, o-phenylene diamine 3-methoxypropylamine, phenyldiethanolamine, ethoxyethoxy propylamine, N-aminoethyl piperazine, 2-amino-2-ethyl-1:3-propanediol, mono- di- and tri-isopropanolamine. The mol. ratio of (A) to (B) is 0.3-3 and the concn. compsn. contains 3-50% of the accelerator and 50-97% alkaline material, esp. a major proportion of alkali hydroxides.