STUDY OF THE HUMID HEAT, ULTRAVIOLET RADlATION DURABILITY OF SOME COATINGS BASED ON ACRYLIC RESINS. l. STUDY OF THE INFLUENCE OF THE CHEMICAL NATURE ON THE HUMID HEAT, ULTRAVIOLET RADIATION DURABILITY OF SOME COATINGS BASED ON ACRYLIC RESINS

Abstract

The degradation of some coatings based on LORIAC acrylic resin AC 330-50, PARLOID acrylic resin B-66 and acrylic polyol AC 7310, HSU 1168 crosslinked by poly isocyanateDesmodur N-75 under the influence of ultraviolet radiation, humid heat have been studied. Theobvious decrease of the CNH, CH2, CH3, C6H5, groups and the formation of the products of thephoto-oxidation (the primary amine, hydroxyl, acid, ceton) during the testing process have beenproved by IR spectroscopic analysis. The humid heat, ultraviolet radiation durability of thecoatings have been evaluated