EXPRESSION OF VIBRATION PROOF CHARACTERISTIC OF RUBBER, VIBRATION PROOF RUBBER COMPOSITION, AND VIBRATION PROOF RUBBER MEMBER

摘要

PROBLEM TO BE SOLVED: To provide a method for realizing vibration proof characteristics effective against vibration in a wide frequency or amplitude range by forming a sea-island structure with a specific rubber material as the matrix dispersed with specific particles, in order to shift the dynamic magnification-loss tangent value to the low dynamic magnification-high damping side. SOLUTION: This method comprises dispersing (A) a rubber material as the matrix, showing a certain dynamic magnification and loss tangent (tanδ) with (B) finely crushed vulcanized rubber particles showing higher damping than the component A to form a sea-island structure, in order to impart new vibration proof characteristics to the component A by shifting the dynamic magnification-loss tangent value to the low dynamic magnification-high damping side. Dynamic magnification is defined as dynamic spring constant divided by static spring constant (dynamic spring constant/ static spring constant), wherein the former represents vibration transfer and the latter support rigidity. Loss tangent (tanδ) is defined as loss modulus divided by storage modulus (loss modulus/storage modulus), wherein the former represents dynamic modulus whose phase is 90 deg. deviating from the strain's and the latter is dynamic modulus whose phase is the same as the strain's.