Qualitative Characteristics of Rubber Vibration Isolator : Influences of Mastication and after Cure

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  • 加硫前後の条件による防振ゴムの特性の変化
  • カリュウ ゼンゴ ノ ジョウケン ニ ヨル ボウシン ゴム ノ トクセイ ノ ヘンカ

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Abstract

Influences of vulcanizing temperature and time on the dynamic characteristics of hevea stocks were previously reported by the authors. In this report, dynamic properties of the tread stocks, having the same rate of chemical composition, contained different carbon blacks and accelerators, were studied under the following conditions ; (1) Influences of mastication before vulcanization. (2) Influences of cooling conditions just after vulcanizing process. (3) Variations of moduli with an elapse of time after vulcanization. Then the following results were obtained; (1) Increasing the time of mastication, less amplitude dependencies were recognized, and complex modulus and loss factor decreased. (2) Imaginary part of complex modulus and loss factor increased, and real part of complex modulus decreased by the instantaneous cooling, just after vulcanizing process. (3) Generally, complex modulus slightly increased as time elapse after vulcanization and there were differences of variant mode of their characteristics by the type of carbon black and accelerator.

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