Laminated Panels with Switchable Adhesive for Clean Recycling
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Solution Overview
Problem
Existing panels with laminated layers bonded by permanent adhesives like polyurethane face challenges in clean delamination during recycling, leading to contaminated material streams due to the high adhesive strength of these bonds.
Innovation Solution
Incorporation of a switchable adhesive with adjustable strength, allowing layers to be separated cleanly by exposure to irradiation, thermal treatment, solvent, or pH modifying agents, reducing adhesive strength to facilitate delamination without excessive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If permanent adhesives like polyurethane are used to bond laminated layers, then the bonding strength and durability are improved, but the ease of delamination for recycling deteriorates
Solution Approach 1:
The adhesive's bonding strength is made dynamically adjustable through a switchable state mechanism. In the first state, the adhesive provides strong permanent bonding for panel usage. In the second state, triggered by specific stimuli (heat, moisture, pH change, or irradiation), the adhesive's bonding strength is significantly reduced to facilitate clean delamination during recycling. This dynamic property resolution allows the same adhesive to satisfy both contradictory requirements at different times.
Solution Approach 2:
The adhesive's key parameter (bonding strength) is made changeable through external stimuli. By exposing the adhesive to specific conditions such as thermal treatment, solvent exposure, pH modifying agents, or irradiation, the bonding strength transitions from a high operational value to a reduced recycling value. This parameter change enables the adhesive to provide strong bonding during use while allowing easy separation during recycling.
2Reliability
If high adhesive strength is used to ensure durable bonding, then the reliability of the panel structure is improved, but the purity of recycled material streams deteriorates due to contamination
Solution Approach 1:
The adhesive transitions from a static permanent bond to a dynamic switchable bond. During panel operation, the adhesive maintains reliable strong bonding. During recycling, the adhesive's bonding strength is switched down through external stimuli, enabling clean separation of layers without material contamination. This dynamic behavior resolves the contradiction between reliable bonding and clean delamination.
Solution Approach 2:
The bonding strength parameter of the adhesive is made variable through exposure to specific stimuli (thermal, chemical, or radiative). This parameter change from high to low bonding strength allows the adhesive to provide reliable structural bonding during use while enabling precise, clean delamination during recycling, thus maintaining high purity of recycled material streams.
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
Enables clean and efficient separation of laminated layers into pure material streams, suitable for recycling, by adjusting adhesive strength to a reduced value using switchable adhesives, ensuring minimal contamination.
Implementation Method 1
the adhesive strength of the switchable adhesive is adjustable from an operational value suitable for the panel during its use, to a reduced value suitable for the panel to be recycled, by exposing the switchable adhesive that is present between the two adhered layers, to: irradiation
Implementation Method 2
the adhesive strength of the switchable adhesive is adjustable from an operational value suitable for the panel during its use, to a reduced value suitable for the panel to be recycled, by exposing the switchable adhesive that is present between the two adhered layers, to: a thermal treatment
Data Source
AI summary
A panel, in particular a floor, ceiling, or wall panel, of a planar design having a top side and bottom side, and multiple side edges, which panel has a structure of laminated layers that are adhered to each other, wherein the laminated layers extend parallel to the plane of the panel, and include a core layer having a lower side and an upper side, and a top layer which is provided on the upper side of the core layer either directly or indirectly, wherein at least two layers of the laminated structure, in particular the top layer and the core layer, are directly or indirectly adhered to each other.