Anti-Vibration Rubber Composition for Ozone Resistance and Frequency Damping
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Solution Overview
Problem
Existing rubber vibration dampers face challenges in achieving high ozone resistance, low energy dissipation at low frequencies, and high energy dissipation at high frequencies, which affect their lifespan and vibration reduction effectiveness.
Innovation Solution
A rubber composition comprising a highly saturated copolymer with ethylene units and 1,3-diene units, carbon black with specific surface area, and a crosslinking system with peroxide and (meth)acrylate compounds, designed to enhance ozone resistance and frequency-specific energy dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rubber compositions are used to ensure good ozone resistance, then the lifespan of anti-vibration devices is extended, but energy dissipation at low frequencies increases leading to excessive heat generation
Solution Approach 1:
The patent changes the chemical composition parameters by using a highly saturated copolymer (≥80% saturation) with specific ethylene (50-90 mol%) and diene (10-50 mol%) unit ratios. This parameter optimization achieves both high ozone resistance and low low-frequency energy dissipation (tan δ at 1 Hz ≤ 0.15), resolving the contradiction between reliability and energy loss.
Solution Approach 2:
The patent creates a composite rubber composition combining highly saturated copolymer with specific fillers (carbon black, silica) and crosslinking agents. This composite approach achieves synergistic effects where the copolymer matrix provides ozone resistance while the optimized filler system controls energy dissipation characteristics across different frequencies.
2Loss of energy
If rubber composition is optimized for low energy dissipation at low frequencies, then heat generation is reduced extending device lifespan, but vibration reduction effectiveness at high frequencies decreases
Solution Approach 1:
The patent optimizes the copolymer saturation level (≥80%) and monomer ratio to create a material with dual-frequency performance. The specific composition parameters enable low tan δ at 1 Hz (≤0.15) while maintaining high tan δ at high frequencies (20-700 Hz), achieving both reduced heat generation and effective vibration damping.
Solution Approach 2:
The patent designs the rubber composition to exhibit dynamic viscoelastic properties that adapt to different frequency inputs. The highly saturated copolymer structure with optimized crosslinking creates a material that dissipates energy efficiently at high frequencies (vibration peaks) while remaining relatively loss-free at low frequencies (normal operation), providing frequency-dependent performance.
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 improves the lifespan and vibration isolation performance of anti-vibration devices by balancing ozone resistance and energy dissipation across different frequency ranges, reducing noise and vibration transmission.
Implementation Method 1
a crosslinking system comprising at least one peroxide and a crosslinking co-agent selected from the group consisting of (meth)acrylate compounds, maleimide compounds, allylic compounds, vinyl compounds and mixtures thereof
Implementation Method 2
a reinforcing filler comprising at least one carbon black having a specific surface area BET of between 5 and 110 m2/g
Implementation Method 3
an elastomeric matrix comprising at least one copolymer containing ethylene units and 1,3-diene units
Data Source
AI summary
The invention relates to an anti-vibration rubber article comprising a rubber composition based on at least one elastomer matrix comprising at least one copolymer containing ethylene units and 1,3-diene units, the molar fraction of the ethylene units in the copolymer being in a range from more than 50% to 95%; a reinforcing filler comprising at least one carbon black having a BET specific surface area is between 5 and 110 m²/g; and a crosslinking system comprising at least one peroxide and one crosslinking co-agent selected from the group consisting of (meth)acrylate compounds, maleimide compounds, allyl compounds, vinyl compounds and mixtures thereof.