Vibrationproof Rubber Using Solution-Polymerized S-SBR
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Solution Overview
Problem
Existing vibrationproof rubber compositions for vehicles do not adequately enhance attenuation, and previous techniques focused on reducing rolling resistance in pneumatic tires do not address the need for improved vibration absorption in engine mounts and other vibrationproof members.
Innovation Solution
A rubber composition with a high proportion of solution-polymerized styrene butadiene rubber (S-SBR), optimized molecular weight distribution, and inclusion of silica or carbon black to enhance filler dispersibility and attenuation, while maintaining suitable hardness and reducing dynamic magnification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rubber compositions (natural rubber + styrene/butadiene rubber) are used, then manufacturing cost and ease of manufacture are maintained, but attenuation performance is insufficient
Solution Approach 1:
The patent changes the fundamental parameter of rubber composition by using solution-polymerized S-SBR with specifically controlled styrene content (10-45 mass%) and vinyl content (30-65 mass%), replacing conventional emulsion-polymerized E-SBR. This parameter change achieves superior attenuation performance while maintaining manufacturability through well-established solution polymerization processes.
Solution Approach 2:
The patent creates a composite rubber system by combining solution-polymerized S-SBR with natural rubber in specific proportions (85-100 parts S-SBR per 100 parts total rubber). This composite approach leverages the advantages of both rubber types to achieve high attenuation while maintaining ease of manufacture.
2Reliability
If emulsion-polymerized styrene/butadiene rubber (E-SBR) is used, then filler dispersibility is improved, but molecular weight distribution is too broad affecting dynamic performance
Solution Approach 1:
The patent changes the polymerization method parameter from emulsion polymerization to solution polymerization, which inherently produces narrower molecular weight distribution. This parameter change directly addresses the stability issue while maintaining or improving dynamic performance through better-controlled polymer chain structures.
3Reliability
If high styrene content S-SBR is used to improve attenuation, then vibration absorption increases, but hardness becomes too high reducing comfort
Solution Approach 1:
The patent optimizes the styrene content parameter within a specific range (10-45 mass%) rather than using maximum styrene content. This balanced parameter setting achieves sufficient vibration absorption while controlling hardness to appropriate levels for comfort, demonstrating the importance of parameter optimization rather than maximization.
Solution Approach 2:
The patent applies local quality by having different rubber components (S-SBR and natural rubber) in specific proportions within the composition, where each component contributes different properties. The S-SBR provides attenuation while natural rubber helps control hardness, creating a balanced local property distribution in the final product.
4Reliability
If conventional rubber compositions are used, then dynamic magnification is controlled, but attenuation performance remains insufficient for advanced vibrationproof applications
Solution Approach 1:
The patent uses a composite material system of solution-polymerized S-SBR combined with natural rubber in optimized proportions. This composite approach achieves superior attenuation performance that effectively reduces internal vehicle noise, while the solution-polymerized structure maintains appropriate dynamic magnification characteristics.
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 proposed rubber composition significantly improves attenuation and dynamic performance, resulting in higher vibration absorption and reduced internal vehicle noise, making it suitable for advanced vibrationproof applications.
Implementation Method 1
a vibrationproof rubber produced using this rubber composition as raw material shows a high attenuation
Implementation Method 2
inclusion of silica or carbon black to enhance filler dispersibility and attenuation
Data Source
AI summary
A rubber composition for vibrationproof rubber is disclosed in which when a total amount of one or more rubber components is regarded as 100 parts by mass, a solution-polymerized styrene butadiene rubber is included in an amount of 85 to 100 parts by mass. This solution-polymerized styrene butadiene rubber is a rubber in which an amount-proportion of styrene is from 10 to 45% by mass, and an amount-proportion of vinyl is from 30 to 65% by mass. The solution-polymerized styrene butadiene rubber is preferably a modified solution-polymerized styrene butadiene rubber. When the total amount of rubber components is regarded as 100 parts by mass, the solution-polymerized styrene butadiene rubber is preferably included therein in an amount of 90 to 100 parts by mass. A carbon black is preferably included therein in an amount of 30 to 100 parts by mass for the same 100 parts by mass.