Thermoplastic Elastomer Damping with Low Compression Set
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Solution Overview
Problem
Conventional thermoplastic elastomer compounds with good damping properties at room temperature often exhibit high costs, poor UV/weathering stability, and high compression set, making them unsuitable for applications requiring both damping and low compression set, such as sealing and gaskets.
Innovation Solution
Incorporating high softening point tackifiers into styrenic block copolymers to shift the Tan Delta Peak Temperature to higher temperatures, resulting in thermoplastic elastomer compounds with enhanced damping capacity and low compression set properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional TPE compounds with high HYBRAR 5127 content are used to achieve good damping properties at room temperature, then damping capacity is improved, but compression set increases and cost increases
Solution Approach 1:
The patent changes the molecular weight parameter of the styrenic block copolymer from conventional low molecular weight (HYBRAR 5127) to high molecular weight (≥200,000 g/mol), which fundamentally alters the material's viscoelastic properties. This parameter change enables the copolymer to provide effective damping at room temperature while simultaneously achieving low compression set, resolving the contradiction between damping capacity and compression set resistance.
Solution Approach 2:
The patent creates a composite TPE compound by combining high molecular weight styrenic block copolymer with specific amounts of polyethylene and polypropylene. This composite formulation achieves synergistic effects where the high molecular weight SBC provides damping and low compression set, while the polyethylene and polypropylene contribute to processability and structural stability, collectively resolving the contradiction between damping performance and compression set.
2Object-generated harmful factors
If high molecular weight styrenic block copolymer is used to reduce compression set, then compression set is improved, but damping capacity may be reduced
Solution Approach 1:
The patent identifies molecular weight as a critical parameter and selects high molecular weight (≥200,000 g/mol) styrenic block copolymer. This parameter change proves beneficial for both compression set resistance and maintaining damping capacity, as the high molecular weight provides both structural integrity for low compression set and sufficient viscoelasticity for room temperature damping.
Solution Approach 2:
The patent creates local quality differentiation within the TPE compound by distributing high molecular weight SBC, polyethylene, and polypropylene in specific proportions. The high molecular weight SBC provides localized damping zones, while the polyethylene and polypropylene provide structural support, creating a material with both low compression set and adequate damping capacity through spatial differentiation of material properties.
3Ease of manufacture
If conventional low molecular weight styrenic block copolymer is used for processing ease, then processability is improved, but compression set and UV/weathering stability worsen
Solution Approach 1:
The patent changes the molecular weight parameter from conventional low to high (≥200,000 g/mol), which improves compression set and UV/weathering stability. The patent compensates for any potential processing difficulties by optimizing the overall compound formulation with polyethylene and polypropylene, maintaining ease of manufacture while achieving superior compression set resistance.
Solution Approach 2:
The patent creates a composite system where high molecular weight SBC is combined with polyethylene and polypropylene. This composite approach allows the high molecular weight SBC to provide improved compression set and weathering resistance, while the blend system as a whole maintains good processability through the contributions of the other polymer components.
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 approach allows for the creation of cost-effective thermoplastic elastomer compounds that maintain useful damping properties at or above room temperature while achieving low compression set, suitable for various industrial applications including seals and gaskets.
Implementation Method 1
by adding high softening point tackifier to styrenic block copolymer to provide a thermoplastic elastomer compound, the Copolymer Tan Delta Peak Temperature of the styrenic block copolymer can be shifted to a higher temperature
Implementation Method 2
damping is the dissipation of mechanical energy from a system
Implementation Method 3
compression set is the permanent deformation of a viscoelastic material after being subjected to a constant stress and an elevated temperature
Data Source
AI summary
An article is formed from a thermoplastic elastomer compound that includes styrenic block copolymer and high softening point tackifier. The styrenic 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 article exhibits useful damping properties at or above room temperature while also exhibiting low compression set, which makes the article especially suitable for use as a seal or a gasket.