New Silicone Foam-Control Agents For Waterborne Coatings
A number of different types of organic- and silicone-based foam-control polymers, compounds, emulsions and dispersions are employed to combat foam, and selecting the proper one, its use level and incorporation method for a specific coating or ink formulation can be quite a task. In addition to effective foam control, the compatibility of the antifoam in the ink or coating formulation must be balanced to avoid surface defects such as craters or fisheyes. Silicone-based antifoams and their performance in selected application will be reviewed in this article, with particular emphasis on polymeric silicone-polyether foam-control agents.
Volume increase during the letdown and mixing steps leading to overflowing;