The following features appear in the September 2013 issue of CoatingsTech:
The Effects of Color Concentrates on the Rheology of Tint Bases
Douglas J. Herrick, Jason W. Boke, Maung Y. Htet, and Raymond H. Fernando, California Polytechnic State University
The ability to control rheology is crucial in controlling the flow behavior of coatings. Rheological properties of coatings formulated with associative thickeners are sensitive to a number of formulation variables, and even small changes in these variables can have a profound effect. Few studies have focused on the large viscosity drop and related problems when predispersed colorants are added to tint bases formulated with associative thickeners. In this study, pastel and deep-tone tint bases were formulated with associative and nonassociative thickeners. The tint bases were tinted with different conventional colorant dispersions and low-VOC counterparts of the same colorants. The effect of the colorants, thickeners, and VOCs on viscosity profiles, dynamic viscoelastic properties, color development, and gloss are quantified.
Analytical Series: Fluorescence Decay Methods for the Characterization of Latex Film Formation
J.M.G. Martinho and J.P.S. Farinha, CQFM, Instituto Superior Tecnico
Fluorescence decay methods have been used extensively to characterize the formation of polymer films from latex dispersions. By measuring the polymer chain diffusion at the nanometer scale, the technique can be used to quantify the extent of mixing between polymer chains from different particles that ultimately leads to the formation of a coating with good mechanical properties.
Exterior Coatings for Vertical Wood Surfaces: Demand Grows for Long-Lasting, Easy-to-Apply Paints
Cynthia Challener, CoatingsTech Contributing Writer
The paint on the exterior walls of a building, particularly in residential construction, does much more than protect the wood surface beneath it. The expectations for the appearance and durability of exterior paints and coatings are high. Intensifying the pressures are increasingly strict VOC regulations and growing consumer demand for more sustainable solutions. As a result, close relationships throughout the value chain are necessary as formulators face the challenge of developing low-VOC, high-quality, longer-lasting exterior paints for a wide range of wood and mixed substrates.
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