| 摘要 |
PROBLEM TO BE SOLVED: To provide a defoaming agent which does not obstruct achievement of requested high cleanliness of a machine surface in a washing step of a working machine, and has solved problems of a conventional defoaming agent, and a low-foaming processing oil agent for metal/glass processing, which contains the defoaming agent.SOLUTION: For a water-soluble defoaming agent whose effective component is polyoxyalkylene amine, a compound of a specific structure in polyoxyalkylene amines (R-(OA)-(OA)-NH) which are more highly water-soluble compared with a silicone defoaming agent can be utilized as the defoaming agent. A low-foaming processing oil agent for metal/glass processing contains the defoaming agent. |
