Adhesion of latex paints over substrates previously coated with alkyd paints is a property of interest as the paint industry is transitioning towards waterborne systems. A thorough understanding of the variables associated with the test method for assessing the adhesion of latex paints over alkyd surfaces is required to improve data reproducibility and thereby improve differentiation among latex paints. This study focused on the effects of environmental and application conditions on adhesion following ASTM D3359 method. A set of six variables were identified as potential root causes such as alkyd substrate curing time, latex paint drying conditions, and latex paint thickness. D-optimal design of experiments was conducted for estimating Taylor-Series Expansion models involving main effect and two factor interaction terms. Data were collected, analyzed, and predictive models were developed to estimate the trends in the adhesion responses associated with the variables. Finally, optimized levels of each of the significant factors were identified to improve differentiation among latex paints. Analytical characterization techniques such as atomic force microscopy, X-ray photoelectron spectroscopy, and time-of-flight secondary ion mass spectrometry were also used to further understand the changes in the alkyd surfaces due to changes in the environmental conditions.

Design of experiments based approach to investigate the adhesion of latex paints over alkyd surfaces

253rd National Meeting (2017)

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