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http://dx.doi.org/10.7317/pk.2012.36.2.235

Thiazole Type Accelerator Effects on Silane/Silica Filled Natural Rubber Compound upon Vulcanization and Mechanical Properties  

Kim, Sung-Min (Dong Ah Tire & Rubber Co., Ltd.)
Kim, Kwang-Jea (Dong Ah Tire & Rubber Co., Ltd.)
Publication Information
Polymer(Korea) / v.36, no.2, 2012 , pp. 235-244 More about this Journal
Abstract
A thiazole type accelerator MBT (2-mercapto benzothiazole) was added into silica filled natural rubber (NR) compound with various concentrations (0, 1, 2, 3, 4 phr). The effects of MBT on the cure rate, mechanical property, degree of rubber-filler interaction (${\alpha}_F$), crosslinking density, and viscoelastic property ($tan{\delta}$) were investigated. As accelerator concentration increased, the $t_{s2}$ and $t_{90}$ decreased and the crosslinking density and modulus at 300% elongation increased. The tensile strength and elongation increased up to 3 phr and no further increased at 4 phr. The $tan{\delta}$ value measured at room temperature was higher than that of the $70^{\circ}C$. The ${\alpha}_F$ value was not affected by the addition of MBT. The mechanisms for the vulcanization rate were reviewed.
Keywords
2-mercapto benzothiazole(MBT); silica/natural rubber; cure rate; mechanical properties; vulcanization mechanism;
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