Stretchable Film With Fluorinated Surface Layer for Non-Stick Strength
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Solution Overview
Problem
Current stretchable films face challenges in achieving a balance between high stretchability, strength, and water repellency while avoiding surface stickiness, which is essential for wearable devices and printing processes.
Innovation Solution
A composite stretchable film is formed by stacking a polyurethane film with a fluorine atom-containing repeating unit and a polyurethane film with a silicon atom-containing repeating unit, where at least one surface is made of the fluorine-containing polyurethane, enhancing both strength and water repellency while preventing surface stickiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polyurethane film is used to achieve high strength and stretchability, then the film has excellent mechanical properties, but the surface becomes sticky causing mutual sticking and printing failures
Solution Approach 1:
The film is segmented into multiple functional layers: a polyurethane base layer providing strength and stretchability, and a fluorinated surface layer providing non-stick properties. This segmentation allows each layer to independently perform its specialized function without compromising the other.
Solution Approach 2:
The invention uses a composite material structure combining polyurethane and fluorinated compounds. The polyurethane provides mechanical strength while the fluorinated surface layer provides low surface energy for non-stick properties, creating a material that exhibits both high strength and non-stick characteristics simultaneously.
2Object-affected harmful factors
If a silicone film is used to achieve high water repellency and non-stick surface, then the film has excellent release characteristics, but the strength remains low causing easy breaking during stretching
Solution Approach 1:
The film structure segments the water repellency function to the fluorinated surface layer while the polyurethane base layer provides the mechanical strength. This functional segmentation resolves the contradiction by assigning each property to the most suitable material layer.
Solution Approach 2:
The composite structure combines the hydrophobic properties of fluorinated compounds with the mechanical strength of polyurethane, achieving both high water repellency and high strength that neither material could achieve alone.
3Adaptability or versatility
If silicone urethane polymer is used to achieve both strength and water repellency, then the film has balanced properties, but the strength and water repellency are intermediate values not achieving the equivalence of single materials
Solution Approach 1:
Rather than blending materials to achieve intermediate properties, the invention segments functions into distinct layers: the polyurethane layer provides maximum strength while the fluorinated layer provides maximum water repellency. This allows each material to perform at its optimal level rather than compromising both.
Solution Approach 2:
The layered composite structure allows each material to contribute its maximum capability - polyurethane for strength and fluorinated compounds for water repellency - achieving superior performance in both properties compared to intermediate silicone urethane polymers.
Data Source
AI summary
A stretchable film includes, in a stacked form: a polyurethane film containing a repeating unit having a fluorine atom; and a polyurethane film containing a repeating unit having a silicon atom. At least one surface of the stretchable film is made of the polyurethane film containing a repeating unit having a fluorine atom. Thus, provided are: a stretchable film having excellent stretchability and strength, with the film surface having excellent water repellency; and a method for forming the stretchable film.