Reptile Leather Adhesion via Polyester Polyurethane Intermediary
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Solution Overview
Problem
Conventional reptile leather articles, such as watchbands, face the issue of easy peeling of the surface layer containing nitrocellulose, which impairs aesthetics when the protective film is removed, due to low adhesiveness between the reptile leather and the surface layer.
Innovation Solution
A reptile leather article with an intermediate layer of polyester polyurethane and a surface layer of nitrocellulose laminated on the grain side, enhancing adhesion through the urethane bond's affinity with the reptile leather and nitrocellulose, preventing peeling when the protective film is removed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a surface layer containing nitrocellulose is provided on reptile leather to impart luster, then the aesthetic appearance is improved, but the surface layer easily peels off reducing durability
Solution Approach 1:
An intermediate layer containing polyester polyurethane is introduced between the reptile leather and the nitrocellulose surface layer. This intermediate layer acts as a mediator that enhances adhesion to the nitrocellulose surface layer while maintaining the luster provided by the surface layer, thereby preventing peeling without sacrificing aesthetic appearance.
2Reliability
If a protective film is pasted onto the watchband buckle to prevent damage, then protection during storage and transport is improved, but the protective film causes surface layer peeling when removed
Solution Approach 1:
The intermediate layer containing polyester polyurethane serves as a protective intermediary that prevents direct adhesive contact between the protective film and the nitrocellulose surface layer. This allows the protective film to be applied and removed without causing peeling of the aesthetic surface layer, while still providing the necessary protection during storage and transport.
3Reliability
If the adhesion between reptile leather and nitrocellulose surface layer is increased to prevent peeling, then durability is improved, but the application process becomes more complex
Solution Approach 1:
The coating system is segmented into distinct functional layers: an intermediate layer containing polyester polyurethane and a surface layer containing nitrocellulose. This segmentation allows each layer to perform its specific function - the intermediate layer provides adhesion and the surface layer provides luster - while simplifying the overall application process through standardized layering procedures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of an intermediate layer of polyester polyurethane significantly reduces peeling of the nitrocellulose surface layer, maintaining the aesthetics of the reptile leather article by increasing adhesion, even in the presence of fatliquoring agents and enhancing colorless transparency.
Implementation Method 1
enhancing adhesion through the urethane bond's affinity with the reptile leather and nitrocellulose
Implementation Method 2
an intermediate layer containing polyester polyurethane and a surface layer containing nitrocellulose laminated, in that order, on a grain side of reptile leather
Data Source
AI summary
A reptile leather article is formed by laminating an intermediate layer containing polyester polyurethane and a surface layer containing nitrocellulose, in that order, on the grain side of reptile leather. The reptile leather article preferably contains a hexavalent chromium reducing compound component capable of reducing hexavalent chromium into trivalent chromium. The hexavalent chromium reducing compound component is preferably at least one type selected from a compound (A-i) represented by formula (A-i) and a tannin (A-ii): (n represents 0, 1, or 2, R11 to R18 each independently represent a hydrogen atom, a hydroxy group, or the like, at least one of R11 to R14, R16, and R17 is a hydroxy group when n is 0, at least one of R11 to R18 is a hydroxy group when n is 1 or 2, and a plurality of R15 may be the same or different and a plurality of R18 may be the same or different when n is 2).