色彩管理的革命 – 色彩稳定性的预测.pdf

1、A Revolution in Color Management Prediction of Color StabilityJim MacDonald,Business Line Manager for Industrial Paint and CoatingsBYK-Gardner USAImportance of Color Stability Color is key in purchasing decisions Color harmony and long-term stability are crucial Sunlight exposure can fade colors ove

2、r time Decay of fluorescent ingredients affects appearanceColor Fastness in Automotive Interiors Many car interior parts made from polymers Parts often manufactured in different locations Mismatched fading can lead to customer dissatisfaction Predicting color stability is essential for quality contr

3、olFactors Influencing Color Experience Color 60 gloss Fluorescence Combined effect createsoverall appearanceEvolution of Color Measurement Traditional:Color and gloss only Next generation:Includes fluorescence prediction Technology that combines a spectrophotometer and fluorimeter Enables quantifyin

4、g fluorescence degradation over timeMeasuring Color Key Geometries 45/0-Replicates visual color assessment Diffuse/8-Measures scattered light reflection Multi-angle-For special effect pigmentsPrinciples of Fluorescence Absorption of light energy by molecules Emission of longer wavelength light Occur

5、s rapidly after excitation Distinct from phosphorescence(delayed emission)Evaluating Fluorescent Energy Measure excitation and emission spectra Quantify intensity relative to concentration Account for equipment factors(light source,detector)Use standardized measurement conditions Spectrophotometers

6、with UV-cut filter Take two readings with and without UV component Significant difference indicates fluorescence Excitation only in UV region Natural/accelerated weathering tests No clear indication why fading occursStokes Shift Explained Emitted energy divided into heat and light:Stokes Shift Diffe