WERKWIJZE VOOR HET BEREIDEN VAN EEN PREPARAAT VOOR HET ONTSCHUIMEN VAN WATERRIJKE OPLOSSINGEN EN DISPERSIES.

摘要

In the disclosed method of preventing the formation of foam and destroying existing foam in an aqueous solution or dispersion, an effective amount of a composition comprising about 0.2 to 7.5 percent by weight of highly disperse silica or alumina with the balance being methylpolysiloxanepolyoxyalkylene mixed block polymer consisting essentially of A. ABOUT 10-60 PERCENT BY WEIGHT OF METHYLPOLYSILOXANE; B. WITH THE BALANCE POLYOXYALKYLENE, > 80-100 PERCENT BY WEIGHT OF THE POLYOXYALKYLENE BLOCK CONSISTING OF OXYPROPYLENE UNITS, IS ADDED TO THE SOLUTION OR DISPERSION.