SURFACE CHEMISTRY ASPECTS ON THE USE OF ULTRA-FILTRATION FOR THE RECYCLING OF WATERBASED SYNTHETIC METALWORKING FLUIDS: -COMPONENT STUDIES.

Abstract

Ultrafiltration studies of solutions of components potentially useful for the formulation of synthetic, waterbased metalworking fluids demonstrates the applicability of the separation method for the removal of dispersed particulate and leak oil contaminants from surfactant solutions, provided these are designed not to form large size micelles or other aggregates Inherent membrane performance data were established for a laboratory size UF-module and a fluoropolymer based material with a molecular weight cut-off or 20,000 was selected for the continued studies It was found that counterion influence on flux and permeation ratio for a given straight chain carboxylic acid may be a result of influence on CMC, monomer concentration, solution and concentration polarized layer viscosity as well as micellar size CMC-values for some carboxylate and phosphate ester salts were determined and correlations between monomer concentration and permeation ratios were demonstrated. The usefulness of ultrafiltration for the determination of CMC and monomer concentration was also shown Results from experiments with a loosely emulsified mineral oil and a series of polyalkyleneglycol ethers implies that concentration in permeate corresponds to component solubility in water in analogy with surfactant monomers.