Abstract: The water solubility of isodecyl alcohol ethoxylates (IC₁₀EO_n),sodium dodecyl benzene sulfonate (LAS) and sodium fatty alcohol ether sulphate (C_12~14E₂S) was measured.The effect of LAS and C_12~14E₂S on the cloud point of IC₁₀EO₈ was studied,while the performance of blend systems composed of LAS,C_12~14E₂S and IC₁₀EO₈,such as wetting power,foaming performance and detergency were examined.Results show that there is no gel phase formed in the solution of IC₁₀EO₃,IC₁₀EO₈ and IC₁₀EO₉ at 25 ℃.The cloud point of the blend systems increases rapidly when the mass fraction of LAS or C_12~14E₂S is higher than 0.6%.The wetting power of the blend systems is better than that of the single surfactant when the mass ratio of IC₁₀EO₈ and LAS or C_12~14E₂S ranges from 3∶1 to 1∶3.The blend systems show best wetting power when the mass ratio of IC₁₀EO₈ and LAS or C_12~14E₂S is 1∶1.Because of poor foaming power of IC₁₀EO₈,the foaming power of the blend systems increases with the increasing content of LAS or C_12~14E₂S,while the variation of foam stability is irregular.The detergency of IC₁₀EO₈ is enhanced by adding anionic surfactant.

Key words: isodecyl alcohol ethoxylate, anionic surfactant, blend, performance