AN ULTRA VIOLET (UV) SPECTROPHOTOMETRIC PROCEDURE IS CURRENTLY USED TO DETERMINE THE RELATIVE CURE OF EPOXY-BASED COATING COMPOSITIONS FOR BEER AND BEVERAGE CANS AND ENDS. THE METHOD HAS BEEN SUCCESSFULLY TESTED ON FILMS OF ACRYLATED EPOXY WATERBORNE COATINGS SPRAY APPLIED OVER ALUMINUM AND STEEL CANS, AND HAS NOW BEEN ESTABLISHED TO MONITOR THE CURE OF SOLVENT-BASED END COATINGS APPLIED OVER ALUMINUM COILS. THE DETERMINATION OF THE DEGREE OF CURE IS BASED ON THE AMOUNT OF THE AROMATIC RING CONTAINING COMPONENTS WHICH ARE EXTRACTED FROM THE FILM WITH A STANDARD VOLUME OF TETRAHYDROFURAN (THF) SOLVENT. FROM THE ABSORBANCE AT 280 NANOMETERS, THE RELATIVE CONCENTRATION OF THE EXTRACT IS ESTABLISHED FROM A STANDARD GRAPH OF CONCENTRATION VERSUS ABSORBANCE. THE NUMBERS DERIVED ARE CORRELATED TO FILM PERFORMANCE PROPERTIES.
| Number of Pages : | 12 |
| Published : | 06/01/1992 |
