1968 年 17 巻 10 号 p. 566-572
Surface active properities of the aqueous solutions of nonionic surfactant containing metal soaps in solubilized form were investigated.
Polyoxyethylene cetyl ether (18 mole adduct C16-18) was synthesized as nonionics used, while metal soaps used were the same as in the previous reports, i.e., laurates and ricinoleates of alkali and alkaline earth metals.
In binary aqueous solutions, the nonionic surfactant to the metal soap was five to one in molar ratio, and the concentrations of the nonionics were mainly 0.02 and 0.001 mol/l.
Synergistic effects were observed to some extent on the surface tention, wetting power for felt and cotton, and foam stability of the mixed solutions.
In the case of foaming power there were no synergistic effects, which is due to the superiority of C16-18 itself, while in contact angle, ricinoleates-containing solutions were slightly inferior than that of the single solution of C16-18.
Among the metal salts constituting binary systems, alkaline earth metal salts were superior in all properties than alkali metal salts, and laurates were superior than ricinoleates in the properties except wetting and foaming powers.
The electric conductivity of binary solutions was considirably high and the specific conductance of the alkaline earth metal salts was about twice as much as that of the alkali metal salt solutions.
In respect to the synergistic effect, the C16-18-metal soap solutions were considerably inferior than dodecyl pyridinium chloride-metal soap solutions.