| abstract |
(A) (i) Hydrophobic organopolysiloxane (ii) Fine powder silica surface-treated with organopolysiloxane (iii) Silicone oil compound obtained by mixing treatment with alkaline catalyst: 1 to 40% (C) Formula R 6 2 R 8 SiO— (R 6 2 SiO) m — (R 6 R 7 SiO) n —SiR 6 2 R 8 (III) [R 6 is a monovalent hydrocarbon group, R 7 is —R 9 —O (CH 2 CH 2 O) c —R 10 (IV) [R 9 is a divalent hydrocarbon group, R 10 is a hydrogen atom, alkyl group, acetyl group or isocyan group, R 8 is R 6 , R 7 , a hydroxyl group or an alkoxy group, c is 3 to 50, and m is 5 to 200. , N is 1-30] Polyoxyethylene-modified organopolysiloxane represented by: 1 to 40% (D) Polyoxyalkylene polymer (E) Nonionic surfactant (F) Water: Antifoam composition containing the balance. [Effects] The antifoaming composition of the present invention has little deterioration in performance over time even after long-term storage after being internally added to the foaming liquid, and has excellent defoaming sustainability. [Selection figure] None |