Epoxies are resins used as coatings and adhesives in a number of applications, including commercial paints. When mixed with a hardener such as polyamine, epoxies react to form hard coatings that resist high temperatures and chemical attack. At PennCoat, we often use epoxy polyamine preparations for painting industrial and commercial spaces that must stand up to wear, chemicals, and contamination.
Epoxy Polyamine paints are typically packaged in 2 components:
- Part A is resin containing epoxy polymer. Depending on the paint, it can include solvents, quartz and titanium dioxide. Epoxies contain the epoxide chemical group, which is a cyclic ether containing a 3-atom ring centered by an oxygen atom.
- Part B is a polyamine hardener that helps determine the product’s characteristics when the two parts are mixed. Amine hardeners undergo a reaction with epoxy resin in which the amine, or NH2, groups polymerize with the epoxide groups to form strong, three-dimensional cross-linked networks that have the desired characteristics.
A common commercial paint we use calls for a 4:1 Part A to B ratio. It is composed of 80 percent solids by volume (89 percent by weight) that is dry to the touch in about eight hours. When dry, it has excellent durability and resists abrasion, weathering, direct impact, heat, moisture, salt and other chemicals. When subjected to the ASTM moisture condensation test for 1,000 hours, HPE applied to a steel substrate showed no blisters, rust, delamination or creepage. Mixed HPE weighs 12.9 pounds per gallon.