Coating processes – With post-treatment of coating or coating material – Coating material recirculation or regeneration
Patent
1998-05-07
2000-02-01
Beck, Shrive
Coating processes
With post-treatment of coating or coating material
Coating material recirculation or regeneration
427399, 210681, B05D 136, B05D 138
Patent
active
060200308
ABSTRACT:
An aluminum alloy substrate is pretreated with an aqueous solution containing an organophosphorus compound, preferably a vinyiphosphonic acid-acrylic acid copolymer, before coating the substrate with a polymer. Passing the substrate through the solution contaminates it with aluminum and other elements. The pretreatment solution is rejuvenated by removing aluminum with a cation exchange resin that preferably contains a styrene-divinyl benzene copolymer functionalized with sulfonate groups. Rinsing the substrate contaminates the rinse water with the copolymer. The rinse water is concentrated by reverse osmosis or membrane ultrafiltration and returned to the pretreatment solution.
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Dennis Alfred M.
Guthrie Joseph D.
Aluminum Company of America
Beck Shrive
Cleveland Michael
Klepac Glenn E.
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