| 摘要 |
Foam prevention agents are described, characterised by a content of a) a compound of the formula R1-X-A-Y-R2 (I> in which R1 and R2 each have an unsubstituted or hydroxyl-substituted aliphatic or araliphatic hydrocarbon radical each having 7-30 carbon atoms, X and Y are each a group of the formula -CO-, -CO-NH-, -O-CO-NH- or -NH-CO-NH- and A is a hydrocarbon bridge having 1 to 20 carbon atoms, b) paraffin wax, c) hydrophobic silicic acid and d) oil immiscible with water, liquid at 20 DEG and having a boiling point of at least 100 DEG , where the components a) and b) are dissolved and/or dispersed in d) and the component c) is suspended in d), and with or without e) emulsifier, and with or without f) water. The production and use of the agents in aqueous systems which have a tendency to foam formation are also described.
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