More on popping.(Coatings Clinic)

JCT CoatingsTech | November 1, 2006| | Copyright

An earlier column (June 2004) discussed popping, but did not cover some important, but less common causes for such defects, such as volatiles produced by melamine-formaldehyde and other amino resin crosslinking reactions, C[O.sub.2] produced by moisture-cure urethanes and 2K waterborne urethanes, and popping/gassing in powder coatings.

Crosslinking reactions of polyols and other reactive resins with melamines and other amino resins give off volatiles such as water, ammonia, and alcohols. As long as the surface of the coating stays open, their emissions will hardly be ...

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