Examination of the Enzyme Resistance of Polyurethane Powder Coatings

Abstract

Polyurethanes powder lacquers were obtained in a reaction hydroxy terminated polyester resin RUCOTE 102 and blocked polyisocyanate crosslinkers. The polyisocyanates were synthesized using alicyclic diisocyanates (IPDI and H12MDI) and monohydric aliphatic alcohols as well as dibutyltin dilaurate and triethylamine as a catalysts. The biodegradation experiments were realized in solution consisted of lipase (Novozym 735, Novozym 51,032, Lipolase 100L or Palatase 20,000) and phosphate buffer during 42 days at 37 °C. The biodegradation progress was controlled by using optical microscopy method, thermal analysis TG/DTA, DSC method, surface free energy parameters, total organic carbon measurements and sample weight loss. The three-dimensional surface topography of the powder lacquers by means of confocal microscope was investigated. The values of surface roughness parameters were calculated. © 2012 The Author(s).