Freeze-thaw stability of epoxy resin emulsions
Epoxy resin emulsions are used in water-based coatings for surface protection of concrete and metal. An unfortunate drawback for most emulsions is their poor freeze-thaw stability. Epoxy emulsions are indeed unstable below 0°C, -5°C or -10°C, depending on the type of resin. In this study, other factors capable of influencing the freeze-thaw behaviour were investigated: e.g. solids content, amount and type of emulsifiers, solvents, protective colloids. Discusses methods for testing the quality of thawed emulsions as well as the physics involved in their destabilization. Freeze-thaw performance can be improved by different means but mostly not without sacrificing resistance properties of the coating. Therefore, avoiding temperatures below 0°C is still the best advice.
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