Thermoplastic Polyurethane Bead Foam Composition for Low-Temperature Processing
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Solution Overview
Problem
Existing bead foams made from thermoplastic polyurethane or other elastomers face challenges in processability at low temperatures, leading to inadequate adhesive bonding and mechanical properties in molded bodies, particularly in applications like the shoe sector where damping, cushioning, and compression properties are crucial, and there is a need for improved throughput in industrial production without compromising material quality.
Innovation Solution
A bead foam composition comprising 60-90% thermoplastic polyurethane and 10-40% polyethylene, with specific molar mass ranges and reaction conditions to optimize hardness, melt index, and molecular weight, allowing for improved processability and mechanical properties, including enhanced tensile and flexural strength, rebound resilience, and reduced density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bead foams are processed at low temperatures to improve adhesive bonding and reduce material impairment, then mechanical properties and bonding quality are improved, but processability and production throughput deteriorate
Solution Approach 1:
The patent modifies the chemical composition parameters of the bead foam by incorporating specific plasticizers and anti-aging agents in defined concentrations. This changes the material's thermal and mechanical parameters to enable processing at lower temperatures while maintaining productivity, resolving the contradiction between bonding quality and production throughput.
Solution Approach 2:
The invention creates a composite material system combining thermoplastic elastomer bead foams with specific plasticizers and anti-aging agents. This composite formulation improves both low-temperature processability and adhesive bonding while maintaining production efficiency, addressing the contradiction between reliability and productivity.
2Productivity
If rapid processing is used to maximize throughput in industrial production, then productivity is improved, but material quality and bead foam stability deteriorate
Solution Approach 1:
The patent incorporates anti-aging agents and plasticizers into the bead foam composition before processing. This preliminary chemical modification stabilizes the material structure in advance, preventing degradation during rapid processing and maintaining quality despite high throughput rates.
Solution Approach 2:
The invention adjusts the chemical composition parameters by adding specific plasticizers and anti-aging agents, which changes the material's thermal stability and processing window. This enables rapid processing without compromising bead foam stability or quality, resolving the contradiction between productivity and reliability.
3Strength
If higher density materials are used to improve compression properties, then mechanical performance is improved, but weight and material consumption increase
Solution Approach 1:
The patent modifies the bead foam composition by incorporating plasticizers and anti-aging agents that enhance compression properties through changes in molecular structure and intermolecular forces. This allows achieving superior compression performance in lower density materials, resolving the contradiction between strength and weight.
Solution Approach 2:
The invention creates a composite formulation where plasticizers and anti-aging agents work synergistically with the thermoplastic elastomer to enhance compression properties. This composite approach enables achieving high mechanical performance with reduced density, addressing the contradiction between strength and weight.
Data Source
AI summary
Bead foams may be made of thermoplastic polyurethane and polyethylene(s), and moldings produced therefrom, may made of a composition with (a) 60 to 90 wt. % thermoplastic polyurethane and (b) 10 to 40 wt. % of polyethylene, relative to a total 100% by weight. The bead foams and moldings may be produced and/or used for shoe intermediate soles, shoe insoles, shoe combisoles, cushioning elements for shoes, bicycle saddles, bicycle tires, damping elements, cushioning, mattresses, underlays, grips, protective films, in components in the automobile-interior sector or automobile-exterior sector, balls and sports equipment, or as floor covering.