Thermoplastic Polyurethane Laminate with Fluorine Surface Layer
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Solution Overview
Problem
Existing laminates using thermoplastic polyurethane for protection films face challenges in achieving excellent antifouling and adhesion properties while minimizing glue residue and maintaining flexibility, especially when exposed to heat and weathering conditions.
Innovation Solution
A laminate structure is developed with a surface layer containing a fluorine compound, such as fluorosilsesquioxane, and an adhesive layer with specific surface roughness, which aggregates at the interface to enhance antifouling properties and ensures strong adhesion without glue residue upon peeling, using a curable resin composition that penetrates into the thermoplastic polyurethane substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thermoplastic polyurethane substrate is used for protection films, then impact strength is improved, but antifouling and adhesion properties deteriorate
Solution Approach 1:
The patent applies composite materials by combining thermoplastic polyurethane substrate with a fluorine compound-containing layer. The fluorine compound (perfluoroalkyl group) is incorporated into the polymer structure or applied as a coating on the substrate surface, creating a composite material that exhibits both the impact strength of TPU and the antifouling/adhesion properties of fluorinated surfaces.
Solution Approach 2:
The patent applies local quality by concentrating the fluorine compound at the surface layer of the protection film while maintaining the bulk TPU structure. The fluorine-containing polymer or coating is positioned specifically at the interface with the painted plate, providing localized antifouling and adhesion enhancement without compromising the overall mechanical properties of the substrate.
2Reliability
If adhesion is improved by using strong adhesives, then adhesion property is improved, but glue residue increases when peeled off
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition and physical parameters of the adhesive layer. The adhesive contains fluorine compounds and is formulated with specific molecular weight, softening point, and viscosity parameters. The fluorine content and molecular structure are optimized to achieve strong adhesion through chemical bonding and physical interlocking while enabling clean removal without residue.
Solution Approach 2:
The patent applies this principle by designing the adhesive layer as a consumable component that performs its adhesion function temporarily during the protection film's service life. The adhesive is formulated to provide strong bonding during use but to be completely removable without residue after the protection period, effectively serving as a temporary but high-performance bonding agent.
3Ease of operation
If the protection film is designed to be easily removable, then ease of operation is improved, but adhesion property deteriorates
Solution Approach 1:
The patent applies dynamics by creating a time-dependent and condition-dependent adhesion system. The adhesive layer provides strong adhesion under normal service conditions (temperature, humidity, mechanical stress) but changes its bonding characteristics under removal conditions (heat, solvent exposure, mechanical manipulation). This dynamic behavior allows the film to be strongly bonded during use but easily removed when needed.
Solution Approach 2:
The patent applies preliminary anti-action by incorporating heat-activatable release agents or solvent-responsive components into the adhesive formulation. These components are designed to counteract the adhesion bonding in advance under specific removal conditions (heating, solvent application), enabling easy removal without damaging the underlying substrate or leaving residue.
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 laminate achieves excellent antifouling and adhesion properties, maintains flexibility, and prevents glue residue, even under heat and weathering conditions, ensuring effective protection and easy removal without compromising the substrate's mechanical integrity.
Implementation Method 1
the fluorine compound is aggregated at the surface of the surface layer, whereby the surface of the substrate film is modified
Implementation Method 2
a mixture of the thermoplastic polyurethane and a curable resin composition being present in the surface layer 12
Implementation Method 3
an adhesive layer 13 formed on a first surface side of the substrate film 11... the adhesive layer 13 has a surface roughness of 350-750 nm
Implementation Method 4
improving the heat and weather resistance
Implementation Method 5
improving the heat and weather resistance
Data Source
AI summary
The invention of the present application is a laminate in which thermoplastic polyurethane is used, excellent antifouling and adhesion properties are obtained, and glue residue is minimized. The laminate is provided with a substrate film formed from thermoplastic polyurethane, and an adhesive layer formed on one surface side of the substrate film. The substrate film has a surface layer on the opposite side of the first surface, a mixture of the thermoplastic polyurethane and a curable resin composition being present in the surface layer. The content ratio of the curable resin composition is configured so as to gradually decrease from the surface of the surface layer towards the interior of the substrate film. The curable resin composition contains at least one fluorine compound selected from the group consisting of fluorosilsesquioxane and fluorosilsesquioxane polymers, and a curable resin. The adhesive layer has a surface roughness of 350-750 nm.