Method of recovering paints and lacquers from the circulation water of paint shops, in which the paint or lacquer is taken up by the circulation water as overspray and/or drip loss

摘要

In addition to solvents, binders, pigments, fillers and auxiliaries, the paint or lacquer may also contain solid and/or gelatinous impurities and chemical and/or physical coagulants and forms with the circulation water a mixture having a water content of not more than 50%. In order to recover paints and lacquers from this paint shop circulation water, the water inclusions present in the mixture are broken up in a turbulent mixer and removed from the mixing space. The mixture, which has been reduced to a water content of at most 10%, is subsequently converted into a flowable state by addition of up to 40% by weight of organic solvent or solvent mixture. Further solvent is added in a separate stirred tank. After coarse dirt particles have been screened out, the mixture which has been dewatered and diluted in this way is finally freed from the remaining impurities and any coagulants present, from partially gelled binders and from some of the fillers and possibly pigments in the centrifugal field of a one-step separation process at a maximum centrifugal acceleration of 200,000 m/s2, so that it is subsequently ... [lacuna] as base material for original finish formulations ... Original abstract incomplete.