| 摘要 |
1524000 Silicone anti-foam composition DOW CORNING CORP 19 May 1977 [7 Feb 1977] 21101/77 Heading C3T An anti-foam composition comprises (1) a polydimethyl-siloxane fluid, (2) a siloxane resin composed of (CH3)3SiO0À5 an SiO2 unit, preferably in a ratio between 0À4 : 1À2 : 1, and (3) a hydrocarbon solvent for (1) and (2). Suitable preparations are, by weight, (1) 30 to 45%, (2) 1 to 5% wt. (3) 50 to 69%. The compositions are useful for non-aqueous systems such as arise in oil refining, e.g. crude oil or residual coking stock wherein they are more readily dispersible and more effective than (1) alone.
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