Abstract
To improve the energy dissipation capacity of rubber isolation bearings, it is important to find a new rubber material with good applicability and high damping properties. Two types of blends were prepared using nitrile rubber (NBR), brominated butyl rubber (BIIR) and ethylene-vinyl acetate copolymer (EVA): NBR/BIIR and NBR/BIIR/EVA. The vulcanization, mechanical and damping properties of the blends were analyzed. The results show that both blends exhibit excellent vulcanization plateaus and mechanical properties. For NBR/BIIR, as the BIIR content increases, the complementary effects of NBR and BIIR afforded by blending are enhanced. Two damping peaks appeared in the tanδ-T curve and shifted toward lower and higher temperatures, respectively, which clearly widened the effective damping temperature range. However, the damping value in the valley of the tanδ-T curve was as low as 0.39. For NBR/BIIR/EVA, the addition of EVA greatly increased damping in the valley of the tanδ-T curve to approximately 0.54. EVA was observed to be the optimal polymer for improving the compatibility of the NBR/BIIR blend. Moreover, hot air thermal aging tests showed that both blends demonstrated good stability.
Highlights
As a highly unexpected and unpredictable natural disaster, earthquakes do serious damage to human lives and properties
nitrile rubber (NBR), BIIR and ethylene-vinyl acetate copolymer (EVA) masterbatch: The as-received NBR, BIIR and EVA were kneaded on a two-roll mill at room temperature for 3 min and blended with compounding and cross-linking additives, respectively
The vulcanization curves and corresponding characteristics of NBR/BIIR with various blend are shown in Figure 6 and Table 2
Summary
As a highly unexpected and unpredictable natural disaster, earthquakes do serious damage to human lives and properties. An ideal high-damping composite material should have excellent mechanical properties, a high dissipation factor, good anti-aging stability, and a wide effective damping temperature range [10,11,12]. Studies on the damping properties of chlorinated butyl rubber (CIIR) and nitrile rubber (NBR) blends by Tao et al [15] indicate that the effective damping temperature range is approximately. Most of the modifications of blends by rubber blending focus on the improvement of damping properties, and only a few studies deal with the mechanical and aging properties of rubber blends, which is not enough research considering materials used for isolation bearings must have a good overall performance. Studied the damping and mechanical properties of hindered phenol AO-80/CIIR/NBR blend, and noted that the addition of AO-80 can effectively improve the damping in the valley of the blend materials.
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