A new binary accelerator system for sulphur vulcanization of natural rubber

The use of 1-phenyl-2-4-dithiobiuret (DTB) as a secondary accelerator for 2 -(4-morpholinathio)-benzothiazole (MBS) has been investigated in NR. It was found that irrespective of the concentration of DTB, all the cure reaction s followed first order kinetics. Mechanical properties of the system were a nalysed for different DTB loading and the strain crystallising nature of NR is not affected by DTB. In order to correlate the observed technological p roperties with different types of cross-links equilibrium, swelling and thi ol treatment were done. Based on processing characteristics, mechanical pro perties and swelling behavior, the optimum dosage of DTB was found out.