Addition Effects of Oxime on Vulcanization of Diene Rubber

Abstract

Effects of dimethylglyoxime and diacetyl monoxime on the vulcanizing behavior of SBR and NBR are investigated. When the oxime compounds were used in the presence of 0.2 phr of zinc oxide as an accelerator activator, the vulcanization proceeded at faster cure rate and reached to the higher maximum torque compared to those obtained in the absence of oxime compounds. Furthermore, the scorch time was recognized to be nearly equal or slower. The mechanical properties of the rubber vulcanized with oxime compounds together with 0.2 phr of zinc oxide and its aged samples were shown to be the almost same level with those vulcanized with 2 phr of zinc oxide in the absence of oxime compounds. Therefore, using oxime compounds made it possible to reduce the amount of zinc oxide until about 0.2 phr without loss of performance of the vulcanized rubber, which is about one tenth of usually used amount in vulcanization process, e.g. 2 phr.