Functionalization of overbased calcium sulfonates-synthesis and evaluation of antiwear and extreme-pressure performances
- Institut Francais du Petrole, Rueil-Malmaison (France); and others
To improve antiwear and extreme-pressure performances of overbased calcium sulfonates, three overbased substrates with different colloidal characteristics were modified by partial neutralization with two sulfur-containing carboxylic acids, dithiodigylcolic acid and 4,4{prime} -(1,3,4-thiadiazole-2,5-diyl) bis (thiabutanoic) acid (DMTD/AA). In this way, six modified overbased calcium sulfonates were prepared. For each product, the colloidal nature of the calcium carboxylate was demonstrated, and all modified and non-modified compounds were evaluated as antiwear and extreme-pressure additives at different concentrations in oil in four-ball tests. The results of this evaluation show that the antiwear performances of basic overbased calcium sulfonates depends on the colloidal structure, while extreme-pressure properties depend on the total calcium carbonate amount in oil. Functionalization significantly enhances the extreme-pressure performances without affecting the initial good antiwear behavior. 20 refs., 9 figs., 4 tabs.
- OSTI ID:
- 210116
- Journal Information:
- Lubrication Engineering, Journal Name: Lubrication Engineering Journal Issue: 12 Vol. 51; ISSN LUENAG; ISSN 0024-7154
- Country of Publication:
- United States
- Language:
- English
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