Abstract
ABSTRACT ：The effect of the silane coupling agent, bis(triethoxysilypropyl)tetrasulfide (TESPT), on mechanical propertiesof a silica-filled NBR compound for oilseal was investigated. Curing behavior and crosslinking density of the compoundswere measured using ODR (oscillating disk rheometer) and swelling ratio in toluene. UTM (universal testing machine) and shore A hardness tester were used in order to study the characteristics of mechanical properties of original vulcanizatesand aged ones with heated air and ASTM No. 3. oil. Recovery of elasticity which influences the performance and service life of oilseal was investigated by giving bending deformation to vulcanizates in aging condition. After bending aging test,recovery distance was measured and calculated angle of recovery from it. TR (temperature retraction) test was performedon these vulcanizates to determine the low temperature recovery behavior. Wear resistance was measured by Taber type abrasion tester. In addition, SEM was used to characterize the morphology of the worn surface of vulcanizates. The resultshowed that addition of TESPT into silica-filled compound improves not only compound flow-ability, interaction betweenNBR and silica and crosslinking density, but also hardness, 100% modulus, recovery of elasticity, wear resistance, heatresistance and ASTM No.3 oil resistance of vulcanizates.
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