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PROGRESS REPORT ON THE DEVELOPED DETERGENCY FUNCTION,
ARMY COATING AND CHEMICAL LAB ABERDEEN PROVING GROUND MD
The detergency D - solubilization S, K1, and K2 functions for six additional series of soilsurfactant systems are derived DK1 S K2. Examination of these intra-series K1 and K2 relationships together with those of the six series previously reported shows most are either the parabolic or trigonometric type. The saturated 18-C fatty acid is more difficult to deterge by the 20 - 50R adducts of nonylphenol R ethylene oxide mole ratio than the one or two double bond 18-C acids. Apparently the double bond tends to prevent the close packing of the hydrocarbon chains which contributes to the binding energy of the acid soils. Detergent efficiency of the 20R and 30R nonyl phenol adducts increases with increasing chain length of the 12-18C alkylamines, confirming previous results with 14-18C fatty acids at this laboratory. Based on the detersive efficiencies of the 20-50R adducts of nonyl phenol, the absorption of the several classes of soil investigated was in the following increasing order alcohol, amine, acid. Author