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Coatings Ingredients
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Coatings Ingredients

The Effect of Water Resistance on the Durability of Waterborne Coatings

SpecialChem / Oct 22, 2003

Water resistance, UV resistance and the ability to resist damage on thermal cycling are some of the main components that determine exterior durability of many types of coatings. In particular, those coatings that are used on low-slope (or flat) roofs need to have high water resistance for good durability, due to the possibility of forming ponds on these roofs (in addition to needing good UV resistance and resistance to thermal cycling damage). Under conditions of ponded water, we see coating blistering as evidence of poor water resistance. Waterborne coatings are especially susceptible to durability issues pertaining to poor water resistance. Most formulation components for waterborne coatings are either water soluble or have colloid stability (e.g., latex polymer). In all cases, the functional groups on polymers that are used are susceptible to hydrogen bonding or are ionic. Unless the hydrophilic character is balanced with the hydrophobic, the coating will either be water sensitive or the formulation will not have colloidal stability. In addition, the water sensitivity of the latex polymer binder may also impact overall coating water sensitivity.

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