Paint is a very common yet complex fluid that is required to exhibit a wide variety of chemical and rheological properties in order to meet the needs of the consumer. A good paint may be described as one that applies easily to a vertical substrate and, once dry, maintains itself through typical wear and tear; however, this simple qualitative description is actually a multifaceted quantitative problem for paint manufacturers and raw materials suppliers. Market focus, government regulations, and desired paint properties also vary across different countries, which lead to different paint chemistries and testing protocols for each new product development. One example of these diverse requirements is in the area of non-drip or thixotropic paints, which are a subset of architectural coatings that are available only in certain regions. This talk will detail the additional rheological properties needed to achieve a pudding-like substance that otherwise behaves like a traditional paint, including the development of a gel structure and its subsequent effect on the application properties. The consumer use of non-drip paints is also discussed and addresses the need for the special handling of these paints in order to take full advantage of the benefits of their thixotropic behavior.

Rheological and application properties of non-drip paints

252nd National Meeting (2016)

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