BigPatents India

Novel aqueous and powder coating compositions are revealed herein. The novelty of the invention lies in the use of waste Ferric phosphate (FePO4) sludge obtained from pretreatment zinc phophating process. The disclosed coating compositions are made using the sludge as uch and after treating the sludge to neutralize and dry it. Processes of making paint compositions using waste phosphate sludge, a by-product obtained from zinc phosphating metal pretreatment process, for making useful paint compositions comprising mixing wet or dry waste sludge (1-90%) with dispersing agent (0.5-2.00%), emulsifier (0.01-5%), wetting Agents (0.05-0.30%), Freeze-thaw stabiliser (0-5%), thickner (1-3%), pigments (1-50%), biocidal additives (0.01-20%), binder (5-50%) and water (0-20%), resin (5-80%), matting hardener (0-10%), flow control agent (0-2%), degassing agent (0-2%), pigments (1-30%), plasticizer (0-2%), anticaking agent (0.02-2%), additives and/or water. Drawing Sheets: NIL Total Pages: 20. Fig. Nil