Powder coating application processes advantages

The anionic polymerization of lactams represents the only suitable method to prepare powdered PA materials. One advantage here is that the polymerization process is fast, even at temperatures much below than the melting temperature of the synthetized polyamide. Powdered PAs have a number of applications, including flame spraying, electrostatic coating and paste preparation (mainly for cosmetics). 

The dry powder process has several additional advantages over the wet process. For example, much less waste of enamel occurs because the dry over-spray is airborne and recyded in a dosed system. No-pickle ground coats have broadened the application of both wet-process and dry-process systems. These enamels are applied over deaned-only metal. Thus the problems of disposing of pickling acid wastes containing iron sulfates and nickd wastes are eliminated (see Metal surface treatments) (7). 

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