Description
Polyurethane coating manufacture additive for water prevention. Are there additives which prevent a moisture-sensitive coating from becoming unusable when working in very humid regions or as the result of a reaction with water during storage? Yes. In principle, a distinction is made between additives which react with water to yield non-reactive secondary products which are readily soluble and additives which absorb the water. For example, Additive TI – a monofunctional isocyanate – reacts with water to product amine and CO2. In contrast, Additive OF – a non-reactive molecular sieve – binds the water by adsorption so that it is no longer available as a potential co-reactant. Both products can therefore be used as stabilizers in moisture-sensitive coatings, e.g. two-component polyurethane coatings. Additive TI eliminates moisture introduced with solvents, pigments, and fillers in 1-component as well as in classical 2-component PU systems. Furthermore Additive TI is recommended for the storage stabilization of purified diisocyanates against decomposition and discoloration.
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