High Vinyl SEBS Damping Thermoplastic Elastomers
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Solution Overview
Problem
There is a need for thermoplastic elastomer compounds that can be processed at high temperatures while maintaining effective damping properties at or above room temperature, and are economically viable for various applications, including those with plasticizers.
Innovation Solution
Incorporating high softening point tackifiers into high vinyl styrene-(ethylene/butylene)-styrene block copolymers (SEBS) to shift the Copolymer Tan Delta Peak Temperature to a higher temperature, thereby enhancing damping capacity, even when plasticizers are used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional SBCs with low Tan Delta Peak Temperature are used to achieve room temperature damping, then damping properties are improved, but the material cannot withstand high temperature processing
Solution Approach 1:
The patent changes the molecular weight parameter of the SBC from low to high (200,000 to 1 million), which shifts the Tan Delta Peak Temperature to higher values while maintaining room temperature damping. This parameter change allows the material to withstand high temperature processing while retaining damping properties.
Solution Approach 2:
The patent creates a composite system by combining high molecular weight SBC with high softening point tackifiers. This composite approach allows the SBC to provide the base damping properties while the tackifier enhances high temperature stability and processing capability.
2Temperature
If hydrogenated SBCs are used to achieve high temperature processing capability, then processing resistance is improved, but damping properties at room temperature deteriorate
Solution Approach 1:
The patent changes the molecular weight parameter to high values (200,000 to 1 million), which inherently provides both high temperature processing capability and maintains room temperature damping properties, eliminating the need for hydrogenation that would otherwise be required for heat resistance.
3Ease of operation
If paraffinic oil is added to soften the SBC, then hardness and melt viscosity are reduced, but Tan Delta Peak Temperature decreases severely
Solution Approach 1:
The patent changes the molecular weight to high values (200,000 to 1 million), which provides inherent softness and low melt viscosity without requiring excessive plasticizer addition. This high molecular weight base allows for controlled softening while maintaining the Tan Delta Peak Temperature at acceptable levels.
Solution Approach 2:
The patent uses controlled amounts of plasticizer (0-50 parts per 100 parts SBC) to achieve local softening where needed while the high molecular weight SBC matrix maintains the overall damping properties. The plasticizer is added in controlled quantities to provide sufficient softness without severely impacting the Tan Delta Peak Temperature.
4Ease of manufacture
If high molecular weight SBC is used to improve processing stability, then processing capability is improved, but damping properties may be reduced
Solution Approach 1:
The patent optimizes the molecular weight to high values (200,000 to 1 million), which provides excellent processing stability and high temperature resistance. The high molecular weight creates a more stable melt behavior during processing while the specific block copolymer structure maintains adequate damping properties at room temperature.
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 resulting thermoplastic elastomer compounds exhibit increased damping capacity at desired temperatures, such as room temperature or above, and can be processed at high temperatures, offering versatility and cost-effectiveness for diverse applications.
Implementation Method 1
Incorporating high softening point tackifiers into high vinyl styrene-(ethylene/butylene)-styrene block copolymers (SEBS) to shift the Copolymer Tan Delta Peak Temperature to a higher temperature, thereby enhancing damping capacity
Implementation Method 2
damping is the dissipation of mechanical energy from a system
Implementation Method 3
Thermoplastic elastomers (TPEs), which are polymer materials that exhibit elasticity while remaining thermoplastic
Data Source
AI summary
A thermoplastic elastomer compound includes styrenic block copolymer that is high vinyl styrene-(ethylene/butylene)-styrene block copolymer and high softening point tackifier. The high vinyl styrene-(ethylene/butylene)-styrene block copolymer has a Copolymer Tan Delta Peak Temperature and the thermoplastic elastomer compound has a Compound Tan Delta Peak Temperature. The Compound Tan Delta Peak Temperature is greater than the Copolymer Tan Delta Peak Temperature. The thermoplastic elastomer compound exhibits useful damping properties at or above room temperature while also advantageously possessing improved stability for processing and/or applications at high temperatures and upon exposure to weathering.