Anti-Vibration Rubber Composition Damping Modulus Ratio
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Solution Overview
Problem
Existing anti-vibration rubber compositions for vehicles face challenges in achieving high damping properties and a low dynamic-to-static modulus ratio while maintaining heat resistance, particularly in compact engine rooms with elevated temperatures.
Innovation Solution
An anti-vibration rubber composition incorporating a hydrogenated styrene-butadiene block copolymer with a hydrogenation rate of 10% to 90%, natural rubber or blended rubber, a sulfur-based vulcanizing agent, and zinc monomethacrylate, formulated to provide a high damping property and low dynamic-to-static modulus ratio, along with enhanced heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the damping property is enhanced in non-adaptive hydraulic anti-vibration rubber, then the dynamic-to-static modulus ratio increases, but this is undesirable
Solution Approach 1:
The patent applies parameter changes by precisely controlling the hydrogenation rate of the styrene-butadiene block copolymer (10-90%) and optimizing its content ratio (5-20 wt%) relative to natural rubber. By adjusting these parameters, the composition achieves high damping properties while maintaining a low dynamic-to-static modulus ratio, resolving the contradiction between damping enhancement and modulus ratio control.
Solution Approach 2:
The patent uses composite materials by combining natural rubber (or blended rubber) with hydrogenated styrene-butadiene block copolymer in specific ratios. This composite approach leverages the complementary properties of both materials: natural rubber provides good damping, while the hydrogenated copolymer contributes to low dynamic-to-static modulus ratio and improved heat resistance, achieving all three objectives simultaneously.
2Reliability
If high damping and low dynamic-to-static modulus ratio are achieved in non-adaptive hydraulic anti-vibration rubber, then heat resistance deteriorates in compact engine rooms with elevated temperatures
Solution Approach 1:
The patent applies parameter changes by controlling the hydrogenation rate (10-90%) and content ratio (5-20 wt%) of the hydrogenated styrene-butadiene block copolymer. This precise parameter optimization enables the material to maintain both high damping properties with low dynamic-to-static modulus ratio and excellent heat resistance, even in elevated temperature environments like compact engine rooms.
Solution Approach 2:
The patent uses composite materials combining natural rubber with hydrogenated styrene-butadiene block copolymer. This composite structure provides synergistic effects where the hydrogenated copolymer component specifically enhances heat resistance while the overall composition maintains high damping and low dynamic-to-static modulus ratio, resolving the contradiction between vibration control and heat resistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition effectively achieves both high damping and low dynamic-to-static modulus ratios, while offering improved heat resistance and suitable for various applications including engine mounts and seismic isolation devices.
Implementation Method 1
the remaining unreacted zinc monomethacrylate expresses the function of an anti-aging agent to improve heat aging resistance
Implementation Method 2
both high damping and a low dynamic-to-static modulus ratio can be achieved when a specific amount of a hydrogenated styrene-butadiene block copolymer having a hydrogenation rate of from 10% to 90% (B) is used together with a natural rubber
Data Source
AI summary
Provided is an anti-vibration rubber composition, including the following components (A) to (D), in which a ratio of the component (B) to a total content of the components (A) and (B) is from 5 wt. % to 20 wt. %: (A) A natural rubber, or a blended rubber of the natural rubber and a butadiene rubber; (B) A hydrogenated styrene-butadiene block copolymer; (C) A sulfur-based vulcanizing agent; (D) Zinc monomethacrylate. Thus, there can be provided an anti-vibration rubber composition and an anti-vibration rubber each of which is excellent in heat resistance, and has both a high damping property and a low dynamic-to-static modulus ratio.