| 摘要 |
Provided by the invention is a silicone-based oil compound as a base of a defoaming agent of, for example, an emulsion type in an aqueous medium containing a surface active agent capable of exhibiting excellent sustainability of the defoaming activity and stability against dilution. The oil compound comprises (A) from 30 to 98.9% by weight of an alpha , omega -dihydroxy diorganopolysiloxane, (B) from 0.1 to 20% by weight of a poly(organohydroxy siloxane) such as 1,1,1,3,5,7,7,7-octamethyl-3,5-dihydroxy tetrasiloxane and (C) from 1 to 50% by weight of a finely divided silica powder having a specific surface area of at least 100 m<2>/g. |
