Wearable Strap Resin Composition for High Specific Gravity
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Solution Overview
Problem
The demand for wearable electronic device straps with improved comfort and mechanical properties, such as high specific gravity, tensile strength, and tear resistance, is not adequately met by existing synthetic resin materials, which often compromise on durability and elasticity.
Innovation Solution
A resin composition comprising 50-80% thermoplastic resin with a hardness of 80 Shore A or less and 20-50% high specific-gravity inorganic compounds, specifically using a mixture of plasticizer-free thermoplastic polyurethane resins and inorganic compounds like barium sulfate, processed through kneading, extrusion, and injection molding to achieve a specific gravity of 1.6 or more, hardness of 50-80 Shore A, and tensile strength of 15-27 MPa.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorine-containing elastomers (FKM) are used to achieve high specific gravity and suppress elastic restoration, then wearing comfort improves, but manufacturing cost increases
Solution Approach 1:
The patent uses a composite material system combining thermoplastic polyurethane resin with high specific gravity inorganic compounds (barium sulfate, zinc oxide, or titanium dioxide). This composite approach achieves high specific gravity (1.6 or more) and improved wearing comfort while avoiding the high cost of fluorine-containing elastomers, as the inorganic compounds provide density enhancement at lower material cost
Solution Approach 2:
The patent modifies the physical and chemical parameters of the resin composition by controlling the hardness of the thermoplastic polyurethane resin (80 Shore A or less) and optimizing the content of high specific gravity inorganic compounds (20 to 50 parts by weight per 100 parts resin). This parameter optimization achieves the desired specific gravity and mechanical properties while maintaining cost-effectiveness
2Reliability
If high specific gravity inorganic compounds are added to increase specific gravity, then wearing comfort improves, but tensile strength may decrease
Solution Approach 1:
The patent carefully controls the hardness parameter of the thermoplastic polyurethane resin (80 Shore A or less) and optimizes the concentration of inorganic compounds (20 to 50 parts by weight per 100 parts resin). This parameter optimization ensures that the resin matrix maintains sufficient tensile strength (15 to 27 MPa) while achieving high specific gravity through the inorganic compound addition
Solution Approach 2:
The composite structure combines the flexible thermoplastic polyurethane resin matrix with dispersed high specific gravity inorganic compounds. This composite design allows the resin to maintain its load-bearing capacity and tensile strength while the inorganic compounds provide density enhancement, resolving the trade-off between specific gravity and strength
3Reliability
If thermoplastic polyurethane resin with low hardness is used to improve flexibility, then wearing comfort improves, but structural stability deteriorates
Solution Approach 1:
The patent creates a composite system where low hardness thermoplastic polyurethane resin (80 Shore A or less) provides flexibility and comfort, while high specific gravity inorganic compounds (barium sulfate, zinc oxide, or titanium dioxide) provide structural stability. The inorganic compounds act as reinforcing fillers that maintain dimensional stability and prevent excessive deformation while allowing the resin to remain soft and comfortable
Solution Approach 2:
The patent applies different material properties to different functional requirements: the thermoplastic polyurethane resin provides local flexibility and comfort where it contacts the skin, while the dispersed inorganic compounds provide local structural support and stability throughout the material matrix, achieving both comfort and stability simultaneously
Data Source
AI summary
Provided is a resin composition for a strap of a wearable electronic device and a method for manufacturing same. The resin composition for the strap includes: 50% to 80% by weight of a thermoplastic resin having a hardness of 80 Shore A or less, 20% to 50% by weight of a high specific gravity inorganic compound, and may have a specific gravity of 1.6 or more, a hardness of 50 Shore A to 80 Shore A, a tensile strength of 15 MPa to 27 MPa, and a tear strength of 53 kgF/cm 2 to 79 kgF/cm2.