Abstract
The surface behavior at the air/water interface of a number of paraffin-chain compounds used as antifoams in steam boilers has been studied. The compounds were chiefly diacylated piperazines (C 11, C 13, C 15, and C 17), together with dipalmityl, distearyl, and dioleyl diethylene triamines. The effects of acidity of the substrate and temperature were examined using spread monolayers, and in addition equilibrium spreading pressures were measured at higher temperatures (up to 95°C). The results show that certain aspects of current theories of antifoam action need correction and some alternative suggestions are advanced.
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