Thermoplastic polyurethane composition
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Solution Overview
Problem
Existing thermoplastic polyurethane compositions struggle to achieve a balance of high modulus, low density, and the ability to withstand cyclic deformations, often compromising on performance due to increased hard segment content and glass transition temperature.
Innovation Solution
A thermoplastic polyurethane composition is formulated using a blend of polyether polyol and polybutadiene polyol, combined with a diisocyanate and chain extender, to create a reaction product with enhanced properties, including a high flex modulus and low temperature fatigue resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polyolefin resin is used for wire coating, then ease of manufacture and cost are improved, but adhesion to the conductor and resistance to sliding off are insufficient
Solution Approach 1:
The patent uses a multi-layer composite structure consisting of a polyolefin resin layer (for ease of manufacture and cost-effectiveness) and a thermoplastic polyurethane layer (for adhesion and sliding resistance). This composite approach allows each layer to contribute its strengths, resolving the contradiction between manufacturing ease and adhesion reliability.
2Loss of substance
If polyolefin resin is used for wire coating, then cost is reduced, but sliding resistance deteriorates
Solution Approach 1:
The patent employs a composite structure where the polyolefin resin layer provides cost-effectiveness while the thermoplastic polyurethane layer provides the necessary sliding resistance. This allows the system to achieve both low cost and high reliability simultaneously.
3Reliability
If adhesion promoters are added to improve adhesion, then adhesion to conductor is improved, but homogeneity of physical properties deteriorates
Solution Approach 1:
The patent extracts the adhesion function from the bulk resin composition and implements it through a separate thermoplastic polyurethane layer. This eliminates the need to add adhesion promoters to the polyolefin resin, thereby maintaining the homogeneity and stability of the resin's physical properties while still achieving excellent adhesion.
4Reliability
If crosslinking is performed to improve adhesion, then adhesion to conductor is improved, but melting behavior and processability deteriorate
Solution Approach 1:
The patent separates the adhesion function (achieved through thermoplastic polyurethane layer) from the melting and processing functions (maintained through polyolefin resin). This avoids the need for crosslinking in the polyolefin layer, preserving its excellent melting behavior and processability while achieving the required adhesion.
Data Source
AI summary
The invention relates to a thermoplastic polyurethane material that has high flex modulus, low density, and is capable of withstanding repeated cyclic deformation. The thermoplastic polyurethane composition is formed from the reaction product of a polyol component, which includes a blend of a polyether polyol, such as poly(tetramethylene ether glycol), and polybutadiene diol, a diisocyanate component, and a chain extender component.