1970 年 19 巻 2 号 p. 82-93
Surface active properties of the binary aqueous solutions of polyoxyethylene cetyl ether (18 mole adduct; C16-18) -alkaline or alkali earth metal soaps (5 : 1 in molar ratio) were investigated.
In the emulsifying characteristics, C16-18 was found most suitable for the emulsification of kerosene, and no marked change was observed with the mixed solutions as compared to the nonionic agent except those containing barium laurate which decreased the emulsifying rate of kerosene and liquid paraffin.
In the case of dispersing power, no marked change was observed with the mixed solutions for titanium dioxide, carbon black, etc.; but they showed a considerable synergistic effect on manganese dioxide.
Neither C16-18 alone nor the mixed solutions showed anti-bacterial action against several yeasts and moulds.
The results of the rust-preventive power study are as follows : For soft iron, owing to the preventive effect of soap, the mixtures did not rust the metal particularly in the vicinity of 0.001 : 0.0002mol/l in spite of the corrosive properties of C16-18; while in the case of aluminium, C16-18 and the mixtures did not rust it practically above 0.001 : 0.0002mol/l. The barium laurate mixtures were somewhat effective below this concentration. Although changes were very slight for brass, the mixtures were superior than C16-18 alone in general.
Ultimately, the mixed solutions of laurate and ricinoleate of barium etc. were effective especially for the dispersion of manganese dioxide and the rust-prevention of soft iron and aluminium.