Anti-Vibration Rubber Composition for Stable Isolation Across Temperatures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional anti-vibration rubber products struggle to maintain effective vibration isolation across a wide range of environmental temperatures, necessitating the development of improved anti-vibration rubber compositions that can exhibit good vibration properties at various temperatures after crosslinking.
Innovation Solution
The anti-vibration rubber composition is formulated with a specific blend of ethylene-propylene-diene terpolymer (EPDM) and butadiene rubber (BR), with a ratio of storage elastic modulus E′ at −30° C. to E′ at 90° C. after crosslinking of 6.4 or less, ensuring good temperature dependence and vibration isolation capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional rubber materials (EPDM, SBR, butyl rubber) are used in anti-vibration products, then processability and moldability are improved, but vibration isolation performance at various environmental temperatures deteriorates
Solution Approach 1:
The patent uses a composite rubber composition comprising butyl rubber (50-90 parts by weight) and EPDM (10-50 parts by weight). This composite structure combines the excellent vibration damping properties of butyl rubber with the good processability and moldability of EPDM, while achieving superior temperature-dependent vibration isolation performance that conventional single materials cannot provide.
2Ease of manufacture
If silicone oil is blended into butyl rubber composition, then processability and moldability are improved, but temperature-dependent vibration properties at various environmental temperatures deteriorate
Solution Approach 1:
The patent optimizes the compositional parameters by controlling the weight ratio of butyl rubber to EPDM within 50:50 to 90:10. This parameter optimization achieves the right balance between processability and temperature-dependent vibration properties without requiring silicone oil blending, thereby maintaining excellent vibration isolation across various environmental temperatures.
3Reliability
If carbon black and polyolefin oligomer are blended into EPDM composition, then conductivity and durability are improved, but temperature-dependent damping properties deteriorate
Solution Approach 1:
The patent employs a composite system of butyl rubber and EPDM where the base rubber composition itself provides inherent conductivity and durability through the butyl rubber component, eliminating the need for carbon black and polyolefin oligomer additives. This composite approach maintains excellent temperature-dependent damping properties across the operating temperature range.
4Temperature
If styrene-based resin is blended into SBR composition, then tan δ at high temperatures is improved, but overall vibration properties at various environmental temperatures deteriorate
Solution Approach 1:
The patent changes the fundamental compositional parameters by using butyl rubber as the main component (50-90 parts) rather than SBR, and controlling the EPDM content (10-50 parts) to achieve optimal overall vibration properties across various environmental temperatures. This compositional parameter optimization provides broad-spectrum vibration isolation performance without the need for styrene-based resin additives.
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
This composition achieves excellent temperature dependence of E′ and vibration properties, making it suitable for anti-vibration mounts and grommets that require effective performance across various environmental temperatures.
Implementation Method 1
anti-vibration rubber composition that exhibits good vibration properties at various environmental temperatures after crosslinking
Implementation Method 2
enhancing the damping properties of butyl rubber
Implementation Method 3
storage elastic modulus E′ at −30° C. to the storage elastic modulus E′ at 90° C. after crosslinking
Data Source
AI summary
An anti-vibration rubber composition is provided in which the ratio of the storage elastic modulus E′ at −30° C. to the storage elastic modulus E′ at 90° C. after crosslinking (−30° C./90° C.) is 6.4 or less, as measured with reference to JIS K6394: 2007.