非イオン界面活性剤のWater numberについて-2-

概要

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Water titration method which is used for measuring the number of ml's of water (Water Number, or W.N.) required for making the system turbid by adding distilled water dropwise into a fixed quantity of a mixed solution of nonionic surfactant and solvent, was applied to several nonionic surfactants, such as those involving ester linkage, alkyl phenols, alkyl phenol-formalin resins and lower aromatic alcohols, and study was made for comparison of these samples. (1) Comparing the two mixed solvents, DB-4 (dioxane containing 4vol% benzene) and DB-10 (dioxane containing 10vol% benzene), the end point of titration for DB-10 was sharper than that of DB-4. (2) For naerly all of the nonionic surfactants, the water number increased linearly with increase of mole number (n) of ethoxy-unit in a molecule, and began to deviate from the linearity, and at last decreased gradually through the maximum. When n is above 100, there is a tendency for the water number to converge into a range from 10 to 12. (DB-10) (3) When the linear part of the curve is expressed as an equation, W.N.=A+Bn, the value of A decreases linearly against (log N) with increase of N (N : carbon number of the raw material). On the other hand, there was a general tendency for the value of B to become smaller with increase in N (DB-10).
日本油化学会の論文