Moisture scavenger for polyaspartic ester coatings
The company
Several manufacturers of high performance coatings for application to concrete and metal substrates.
The problem
In common with all 2K PU coatings, the presence of moisture affects the reactivity and application properties of the coating. Polyaspartic coatings are no exception and the flow and levelling properties of the coating, in particular, can be adversely affected. The reason this occurs is because moisture/water reacts with the isocyanate component accelerating the cure rate and ultimately leading to poor visual properties of the coating.
To standardise the cure rate, an appropriate amount of oxazolidine can be added in order to control the level of moisture that affects the coating. This is particularly important when coatings are applied during conditions of elevated humidity.
In view of the variable humidity conditions that the coatings companies operate in, they needed to develop a product that would perform equally well in all types of weather conditions.
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