Abstract
The effect of stearic acid on curing characteristic, mechanical properties and swelling of organoclay filled natural rubber vulcanizateswas studied. The mixing of organoclay into natural rubber by using melts compounding method. Stearic acid was added into rubber by insitu and exsitu as a purpose for increasing exfoliation of organoclay in natural rubber matrix. The result showed that maximum torsion (S max ) and difference torsion (S max -S min ) reduced with increasing of stearic acid loading. Adding of stearic acids were not effect to optimum curing time (t 90 ) and slightly increasing scorch time (ts 2 ). The hardness of organoclay filled natural rubber vulcanizates were relatively constant with increasing stearic acid loading. The ratio of stearic acid and organoclay more than 1:1 will be reducing tensile strength of organoclay filled natural rubber vulcanizates. The elongation at break of organoclay filled natural rubber vulcanizates were increased until the ratio of stearic acid : organoclay is 1 : 1. The tear strength of organoclay filled natural rubber vulcanizates were increased with increasing of stearic acid loading by using exsitu, but for insitu, the tear strength of organoclay filled natural rubber vulcanizates were increase until the ratio of stearic acid : organoclay is 1 : 1. The swelling of organoclay filled natural rubber vulcanizates increase with increasing of stearic acid loading. Keywords: Stearic Acid, Organoclay, Natural Rubber.
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