Investigations of the activity of cutting oil additives: III. Oils containing both organochlorine and organosulphur compounds

Abstract

Results of a study on the metal cutting activities of mineral oil blends containing mixtures of organosulphur and organochlorine compounds are reported. Mixtures containing 15 mg atoms % chlorine, as either benzyl chloride or a commercial grade of chlorinated paraffin, Cereclor 51L, and 15 mg atoms % sulphur, as dibenzyl disulphide or di-t-nonyl polysulphide, were used. Most of the blends were prepared using liquid paraffin as the base oil. In the tapping torque test, these blends generally gave a better performance than corresponding blends containing 30 mg atoms % of either of the single components. In a drill life test, all of the mixed element blends were more efficient than those containing the single compound. In addition to the cutting tests, the four ball machine test similarly showed the mixed blends to have superior activities. That this was associated with the chemical activities of the additives was shown in a series of tests. The reactivities of the mixed component blends towards steel was greater than that of the single component blends, and it appears that this was associated with the production in the system of the iron salt of the other element. From this and other findings, reasons for the above-mentioned synergistic behaviour are suggested.