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The mechanical properties of polymeric coatings are often overlooked because researchers are not aware of how modern instrumentation can now aid them in understanding how a particular product may survive in service conditions. In many applications the two main considerations are aesthetics and durability, both of which can be directly related to the mechanical properties of the base material.
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Rust is caused by the influence of water, oxygen and time. Air pollution and contaminants on steel surfaces speed up the corrosion process. When corrosion is caused by condensation water, a micro-porous coating can considerably enhance traditional corrosion protection.
In June of 2006 the South Coast Air Quality Management District (SCAQMD) implemented new volatile organic compound (VOC) requirements for industrial maintenance coatings. Two years prior to this date The California Department of Transportation started looking for a replacement latex resin that would meet these new requirements and still have the same properties as currently used industrial maintenance bridge coatings.
The California Dept. of Transportation (Caltrans), Standard Green Finish Paint (PWB-172B) was introduced in February 2006 because of changes to Volatile Organic Carbon (VOC) regulations in the South Coast Air Quality Management District (SCAQMD). In 2014, Caltrans decided to update the coating formulation, seeking to provide better performance properties.
Waterborne coatings are of growing importance in appliance, automotive refinish, concrete, traffic marking and high performance coatings due to increasing environmental regulation to reduce volatile organic compounds (VOC) and ease of handling. The resins commonly used for conventional solvent borne coating are usually modified by increasing their hydrophilic nature prior to being incorporation into a waterborne coating formulation.
Application of conventional coatings directly to concrete tanks is a common practice for the primary containment of liquids. Substituting the application of polyurea geomembranes in lieu of conventional methods exhibits a significant reduction in application time with regard to certain surface rehabilitation, surface preparation, and priming of substrates. Polyurea geomembranes are high performance liners designed for various reasons that include, but are not limited to, protection of the environment from pollution and hazardous materials or protection of the lining’s contents from vessel contamination.
Although polyurea geomembranes have been successfully used in the market for several years, technical information and performance evaluations are virtually nonexistent. Furthermore, when referring to construction specifications for polyurea geomembranes, physical properties of the coating and geotextile are listed rather than those of the geomembrane. Polyurea geomembranes have unique properties, and they deserve the same comprehensive testing and reporting as the components used to form them.