Surface Evaluations of Two-Component Hybrid Organosilane Coatings with Polar and Non-Polar Liquids
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Easterday, Jacy
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Abstract
Polymers and oligomers are often used in thermosetting (thermoset) coatings because they can provide a cross-linked solid material that cannot be melted. Properties, including exterior durability, corrosion resistance, and solvent resistance, are appealing in the coatings industry because they can be applied to a substrate as a layer of protection. When a substrate is not protected, it is exposed to thermal, ultra-violet, biological, and chemical degradation. Once the substrate begins to corrode it can become defective, dangerous, and expensive to repair. For years, coatings have been applied to vehicles to prevent corrosion of the substrate. This concern is critical for all military ground vehicles that are exposed to harsh environmental conditions, such as sea water, as well as potential attack from chemical warfare agents. This study focuses on the performance of two component hybrid organosilane coatings based on epoxy- and amine- functional materials versus a commercially available polyurethane coating currently used on military ground vehicles. Different ratios of epoxy to amines and a blend of different additives were prepared to formulate a chemical resistant coating. Coatings were exposed to water and non-polar liquids (e.g., chemical warfare agent simulants (CWAS)) and analyzed using multiple analytical techniques. This study identified formulations that provided better chemical repellency than the polyurethane chemical agent resistant coating (CARC) used by the military.
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Organosilane, Contact angle, Chemical agent resistant coating, Surface free energy, Chemical warfare agent simulant, Omniphobicity