| 摘要 |
PURPOSE:To obtain a defoaming agent or defoaming compsn. having high defoaming or antifoaming effect by using a specified polyether compd. CONSTITUTION:A polyether compd. as expressed by the formula is used. The compd. is synthesized from a higher fatty alcohol obtd. by the decomposition of a natural raw material for fat or oil having 6-22C satd. or unsatd. hydrocar bon group, or reduced alcohol obtd. by the reduction of fatty acid obtd. by the hydrolysis of natural animal or vegetable fat or oil, or synthetic fatty alco hol. Oxythylene, oxypropylene, and oxyphenylethylene groups are added to the fatty alcohol. Styrene oxide is preferred to obtain the oxyphenylene group. The defoaming agent is used alone or together with other defoaming agent. Suitable content of the component is 1-5000 ppm.
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