界面活性剤としての2-アルキル-4, 4-ジメチル-2-オキサゾリン塩

概要

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2-Alkyl-4, 4-dimethyl-2-oxazolines have been prepared by the condensation of 2-amino-2-methyl-1-propanol derived from 2-nitropropane and formaldehyde with C10-C14 fatty acids. These oxazolines were treated with equivalent of lower organic acids, such as acetic, lactic, citric and tartaric acid and surface activities of these oxazoline salts were determined and compared each other. The results of the experiments indicated that these oxazoline salts had good lowering power of surface tension of water. Of all salts tested, acetate showed generally best ability to lower surface tension. Oxazoline salts which had larger alkyl substituent showed better properties than those with smaller substituent in lower degree of concentration. As regards to wetting power the acetates which had larger alkyl substituent showed also better property than other salts. Emulsifying power was determined against hydrocarbon oil (benzene and kerosene) and fatty oil (soy-bean oil), Benzene was easily emulsified and stable emulsion was obtained, but soy bean oil could not be emulsified effectively. In this case, contrary to surface tension and emulsification, the citrate was found to be superior than other salts. Measurement of foaming power showed that oxazoline salts derived from capric acid were all inferior in foamability and those from lauric acid showed equally good property in general, however, among those from myristic acid, the lactate was proved best in foaming power.