VERFAHREN ZUM BESCHICHTEN VON METALLISCHEN GEGENSTAENDEN IM BANDLACKIERVERFAHREN.

摘要

Articles are coil-coated with primer (A) having dry film thickness up to 25 microns and topcoat (B) of dry film thickness 10-23 microns, (A) and (B) being hardened by baking for 25-70 seconds at article temp. 200-260 deg.C, a sprayed-like structured finish being obtd. (A) is formed from (a1) 20-40% (all pts. wt.) mixt. of (a1a1) 70-95% polyester (IA) from a dicarboxylic acid or anhydride and a diol, with average mol. wt. 2000-18000 g/mol, acid no. 1-15 mg KOH/g, OH no. 5-30 mg KOH (a1a2) 5-30% triazine resin (IIA) or (a1a3) 5-30% blocked polyisocyanate where (a1a1) + (a1a2) + (a1a3) = 100% (a2) 10-40% pigments and/or fillers and/or auxiliaries and additives (a3) 0.1-2% catalyst (a4) 20-65% organic solvent (a5) 0.01-0.05% polyethylene wax (III) with softening pt. 100-120 deg.C, particle size distribution 5-35 microns, opt. with 0.01-5% tall oil alkyd resin (IV) and opt. flow control agent, where (a1) + (a2) + (a3) + (a4) + (a5) = 100%. (B) is formed from (b1) 20-40% mixt. of (b1b1) 70-95% polyester (IB) with average mol. wt. 2000-8000, acid no. 1-15 mg KOH/g, OH no. 5-30 mg KOH/g and (b1b2) 5-30% triazine resin (IIB) or (b1b3) 5-30% blocked polyisocyanate where (b1b1) + (b2b2) + (b3b3) = 100% (b2) 10-40% pigments and/or fillers and/or auxiliaries and additives (b3) 0.1-2% catalyst (b4) 20-65% organic solvent where (b1) + (b2) + (b3) + (b4) = 100%.