Synthesis of a new thiophosphorylated compound derived from cashew nut shell liquid and study of its antioxidant activity

This work describes the synthesis and study of the antioxidant activity in mineral oils of new thiophosphorylated compound derived from cashew nut shell liquid (CNSL), a by-product of the process of improvement of cashew nuts. This study was conducted through the thermal analysis observing the Tonset variations and the accelerated oxidation experiments observing the induction time variations. The results of thermogravimetric and acceleration oxidative experiments showed a significant improvement in the oxidative stability of the doped oils. These results suggest that this new compound acts efficiently in the stabilization of the naphthenic mineral oils.

► The new thiophosphorylated compound derived from hydrogenated cardol, TP-cardol, showed an excellent performance in retarding the mineral oils oxidation processes.
► Results of the accelerated oxidation tests showed a great increase in OIT of samples doped with TP-cardol.
► The performance of the thiophosphorylated compound was also evidenced by the increase in degradation temperature of naphthenic oils.