| 摘要 |
PROBLEM TO BE SOLVED: To provide a defoaming agent composition showing satisfactory defoaming property and dispersibility with a small amount of addition and suitably used to reduce the separation time of cement and aggregates from water as a defoaming agent for slate. SOLUTION: The defoaming agent composition contains 85 to 98 wt.% of a compound expressed by formula (I): R<SP>1</SP>O[(C<SB>3</SB>H<SB>6</SB>O)<SB>k</SB>(C<SB>2</SB>H<SB>4</SB>O)<SB>l</SB>]H and 2 to 15 wt.% of a compound expressed by formula (II): HO(AO)<SB>m</SB>H. In formula (I), R<SP>1</SP>represents a 12-22C hydrocarbon group, k ranges from 20 to 50 and l ranges from 1 to 25. In formula (II), AO represents a mixed polyoxyalkylene group obtained by randomly copolymerizing ethylene oxide and propylene oxide, the proportion of oxyethylene groups in the polyoxyalkylene group ranges from 20 to 50 wt.%, and m ranges from 5 to 25. COPYRIGHT: (C)2003,JPO
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