VERFAHREN ZUM ENTFERNEN VON SAEURE AUS KATHODISCHEN ELEKTROTAUCHLACKIER-BAEDERN.

摘要

Removal of acids from cathodic electro-deposition (CED) baths, in which an electroconductive substrates are coated with cationic resins, in the form of aq. dispersions, (pt. of) the bath is subjected to ultrafiltration, using a membrane which retains the resin and yields an ultrafiltrate contg. water, solvent, low mol. substances and ions and (pt. of) the ultrafiltrate is recycled to the CED bath. The novel features are that (a) (pt. of) the ultrafiltrate, before recirculation to the CED bath, and (b) an aq. soln. of an organic or inorg. base, opt. contg. salts, are each supplied to exchange cells with an anion exchange membrane as separator and solns. (a) and (b) are passed by the surface of the membrane.