The performance test of fatty acid methyl ester sulfonates and application in the dishwashing liquid detergent
ABSTRACT Hydrolytic stability, foaming power and foam stability, calcium soap dispersing ability and stability in hard water of fatty acid methyl ester sulfonate (MES) were measured by potentiometric titration, Ross Miles foam instrument, improved acid titration and turbidimetric test, respectively. The dishwashing detergent formulations containing MES were designed and stability and detergency of dishwashing detergents have been tested. The results showed that when storage temperature was 45degC, MES in pH 4.5 9 was stable, disodium a sulfonated fatty acid esters content increased at pH 10, hydrolysis rate was accelerated; foaming power of MES was lower than sodium linear alkyl benzene sulfonate (LAS) and the foam stability was equivalent to that of LAS; MES showed very excellent calcium soap dispersing ability, calcium soap dispersing amount of MES was 2.5 g calcium soap /1 g MES and LAS was 0.34 g /1 g LAS; differential stability of MES in hard water was and LAS was the performance test results of dishwashing detergent products partially substituted LAS by MES can both meet the requirements of the Chinese national standard. GRAPHICAL ABSTRACT