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13. Oct 2021 | Application Areas

Accelerated test method for dirt pick-up resistance

Dirt pick-up is a long-standing issue for exterior architectural coatings. Researchers have now developmed an accelerated test method for the dirt pick-up resistance of coating formulations.
Newly developed architectural paints must be tested for dirt pick-up resistance before application. 
Image source: StockSnap - Pixabay (symbol image).

Dirt pick-up resistance (DPR) is highly sought by end users, and significant resources have been committed by paint manufacturers to improve it. The task is complicated by the multitude of regional and local factors such as seasonal weather, intensity of economic activity, or atmospheric particle burden.

Typically, paint manufacturers try to control DPR via careful selection of additives and formula optimisation. Testing the new formulas in real time is long and, therefore, there is a clear need for a faster and more reliable test that takes into account the key elements of the dirt pick-up mechanism: particle transport, adhesion, and release to/from the surface.

Accelerated test

A team of researchers has developed an accelerated test that focuses on thermally driven adhesion and takes a fraction of the time necessary for outdoor exposure testing. The test correlates well with early outdoor exposure results. The test was used to improve the accelerated DPR of a paint formula, which subsequently was verified against real-time outdoor exposure in three geographic regions with different climates and airborne particulate pollution levels.

The study has been published in Journal of Coatings Technology and Research, Volume 18, 2021.

EC Library Waterbased Acrylates for Decorative Coatings


Waterbased Acrylates for Decorative Coatings

Aqueous polyacrylates, as binders, dispersing resins and thickening polymers, are nowadays impossible to do without as raw materials in the paints and coatings industry. Since their introduction in the 1950s and 60s, straight acrylic and styrene acrylic dispersions have established themselves as environment-friendly, high-performace alternatives to the solvent-borne, air-drying alkyd resin binders used principally before. The particularly wide performance spectrum and high level of variability of the polyacrylates has enabled the propagation and consistent ongoing development of this product class as binders for coating materials. This book gives an overall view of the preparation and properties of aqueous acrylic dispersions and also the special features pertaining to their use in the architectural coatings sector. Following a general introduction to dispersions and emulsion paints manufacture at the beginning of the book, specialized chapters give a deeper insight into the diverse products such as primers, masonry paints, interior paints, plasters, wood coatings and gloss emulsion paints. The book presents an picture of the preparation of acrylic binders and the formulation of architectural paints. It is aimed both at students and newcomers to the paints and coatings field as well as at experienced dispersion users and practitioners in the paints and coatings industry.

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