The following features appear in the February 2013 issue of CoatingsTech:
TiO2 Scattering Optimization and Not-in-Kind Opacity Alternatives
Michael Diebold, Robert Kwoka, and David Mukoda,DuPont Titanium Technologies, USA
With titanium dioxide in short supply, many coating manufacturers are specially formulating their paints to optimize TiO2 effectiveness and/or turning to not-in-kind alternative options for opacity. These strategies include adding free or attached spacer particles that prevent TiO2 particles from closely approaching one another, minimizing the loss in scattering due to crowding. Additionally, air incorporated into a paint film can improve opacity by two mechanisms, which are detailed in this article. The authors review several of these concepts and report results from lab work that test these strategies, both in terms of the effectiveness to improve opacity as well as the effects that are seen in other important paint film properties.
Investigation of New Open Time Extenders for Low/Zero-VOC Latex Paints and Aqueous Coatings
Zhengang Zong, Aye Min, Yi-Zhong Li, Herve Adam, Jean-Christophe Castaing, and Dayne Swearer, Rhodia,
Inc.To meet stricter environmental regulations regarding lower volatile organic compounds (VOCs), new latex binders are being developed for use in formulating low- and zero-VOC paints. While these paints are expected to perform as well as traditional paints, the open time or wet-edge time of low/zero-VOC aqueous coatings can be a major challenge during application. This article reports the results of a study evaluating a series of new additives developed to extend the open time of low/zero-VOC binders and latex paints. Factors related to open time, including viscosity, PVC, film thickness, and substrates, are detailed. In addition, other properties of low/zero-VOC paints such as freeze/thaw stability, film gloss, stain removal, tint strength, wet adhesion, and scrub resistance were evaluated, and are discussed.
DTM Industrial Coatings: Improving Formulations that Save Time and Money
Cynthia Challener, CoatingsTech Contributing Writer
As in all other segments of the coatings market, end users are looking for solutions that offer increasing performance while meeting environmental requirements, and at the lowest possible cost-in-use. One approach receiving increasing interest in recent years has been the use of direct-to-metal (DTM) coatings as replacements for two-layer primer and topcoat systems. Resin suppliers and coatings formulators are taking on the challenge of developing higher-performing, more environmentally friendly technologies for DTM applications in the industrial sector. CoatingsTech asked leading manufacturers and suppliers to share their insights on this growing area, and comment on how their companies are addressing the challenges and opportunties presented by DTM coatings.
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