Adhesive Sheet with Segmented Urethane Substrate for Curved Surfaces
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Solution Overview
Problem
Adhesive sheets struggle with followability on severely curved surfaces and chemical resistance, particularly in applications like automobiles and aircraft, where they often repel or float off due to insufficient flexibility and chemical exposure.
Innovation Solution
An adhesive sheet comprising a substrate with a urethane-based polymer and a surface protective layer made of acrylic, fluorine, or urethane-based resins, which provides enhanced flexibility and chemical resistance by maintaining a low chemical weight increased ratio and stress relaxation rate, allowing it to adhere neatly to curved surfaces without repelling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adhesive sheet uses a rigid substrate structure, then it provides good chemical resistance, but it cannot follow severe three-dimensionally curved surfaces
Solution Approach 1:
The substrate is divided into multiple layers: a hard layer (polycarbonate-based polyurethane) for chemical resistance and a soft layer (polycaprolactone-based thermoplastic polyurethane) for flexibility. This segmentation allows each layer to perform its specific function, resolving the contradiction between rigidity and flexibility.
Solution Approach 2:
The substrate uses a composite structure combining polycarbonate-based polyurethane and polycaprolactone-based thermoplastic polyurethane in specific weight ratios (30:70 to 70:30). This composite material approach integrates the chemical resistance of the hard layer with the flexibility of the soft layer, simultaneously achieving both required properties.
2Adaptability or versatility
If the adhesive sheet is made flexible to follow curved surfaces, then it improves followability, but chemical resistance deteriorates
Solution Approach 1:
The substrate is divided into multiple layers: a hard layer (polycarbonate-based polyurethane) for chemical resistance and a soft layer (polycaprolactone-based thermoplastic polyurethane) for flexibility. This segmentation allows each layer to perform its specific function, resolving the contradiction between rigidity and flexibility.
Solution Approach 2:
The substrate uses a composite structure combining polycarbonate-based polyurethane and polycaprolactone-based thermoplastic polyurethane in specific weight ratios (30:70 to 70:30). This composite material approach integrates the chemical resistance of the hard layer with the flexibility of the soft layer, simultaneously achieving both required properties.
3Ease of operation
If a coating layer is added to improve sliding property, then surface sliding property improves, but followability on severe curved surfaces worsens
Solution Approach 1:
The substrate uses a soft layer made of polycaprolactone-based thermoplastic polyurethane with specific physical properties (tensile strength 7500-15000 psi, elongation at break 550-750%). This flexible thin film structure provides both sliding property and the ability to conform to severe curved surfaces without repelling or floating.
Data Source
AI summary
[Problem] This is to provide an adhesive sheet having curved surface followability and chemical resistance. [Means for solving] The adhesive sheet is an adhesive sheet having at least a substrate and an adhesive layer, a load at the time of 5% elongation of the substrate is 15 N/cm or less, a stress relaxation rate of the substrate by elongating to 10%, stopping the elongation at that state and after lapsing 600 seconds is 40% or more and 100% or less, and a chemical weight increased ratio of the substrate is 60% or less.