Fast Drying

Achieving fast-drying paints enable applicators to increase productivity and to minimize dust issues. However, high-solid and waterborne formulations tend to increase drying time.

High-solids polyols generally have less function features and a lower Tg (glass transition temperature) which gives longer drying times than conventional systems.

In order to accelerate the drying time, formulators have three options:

•  Raise the curing temperature (60-80 °C)
  Technical feasibility due to some applications constraints can restrain the use of this solution
•  Use a catalyst such as a tin salt (i.e. DBTL = di-butyl tin di-laurate)
  But these products tend to reduce the pot-life and excess of DBTL would also lead to lower final film hardness, less weathering resistance and higher water sensitivity.
•  Use a polyol with a higher Tg and/or use a fast drying polyisocyanate