PROBLEM TO BE SOLVED: To provide a powder antifoaming agent, suitable for long-term storage, capable of being internally added to a powder composition, and also capable of being added to food, while having water dispersibility and fast-acting properties equivalent to an emulsion type antifoaming agent, and to provide a method of producing the same.SOLUTION: A powder antifoaming agent contains: (A) a hydrophobic organopolysiloxane that has a viscosity at 25°C of 10-100,000 mm2/s (B) a fine silica powder (C) a surfactant and (D) a water-soluble encapsulating agent that is in a solid state at 25°C. The powder antifoaming agent is characterized by being obtained by spray drying a dispersion liquid that is obtained by dispersing a silicone oil compound, which is obtained by mixing the component (A) and the component (B), and the component (D) in water in the presence of the component (C), and is also characterized in that the silicone oil compound is encapsulated by the component (D) that serves as an outer shell. Since the powder antifoaming agent does not contain water by being produced by a spray dryer method, the powder antifoaming agent is free from problems of emulsion antifoaming agents such as separation and putrefaction, thereby exhibiting extremely excellent storage stability.COPYRIGHT: (C)2013,JPO&INPIT【解決手段】(A)25℃における粘度が10~100,000mm2/sである疎水性オルガノポリシロキサン、(B)微粉末シリカ、(C)界面活性剤、及び(D)25℃で固体状の水可溶包括剤を含有する粉末消泡剤であって、前記成分(A)と成分(B)とを混合してなるシリコーンオイルコンパウンドと前記成分(D)を前記成分(C)の存在下に水に分散させた分散液を噴霧乾燥することによって得られ、前記シリコーンオイルコンパウンドを前記成分(D)を外殻として包括してなることを特徴とする粉末消泡剤。【効果】本発明の粉末消泡剤によれば、スプレードライヤー法で製造されることにより水を含まない状態となっているため、エマルション型の消泡剤のような分離や腐敗といった問題がなく、保存安定性に著しく優れている。【選択図】なし
