| abstract |
An antifoaming agent having excellent antifoaming properties and less generation of aggregates (pitch) due to the antifoaming agent is provided. SOLUTION: Hydrophobic silica (A) comprising a base oil (B), a metal soap (C) and a surfactant (D) which are liquid at 25 ° C., hydrophobic silica (A), 25 ° C. Based on the weight of the base oil (B), the metal soap (C) and the surfactant (D), which are liquids, the content of the hydrophobic silica (A) is 1 to 15% by weight and is liquid at 25 ° C. The base oil (B) content is 60 to 97.5% by weight, the metal soap (C) content is 0.5 to 10% by weight, and the surfactant (D) content is 1 to 15% by weight. Use a defoamer that is characterized. [Selection figure] None |