Backing Layer Coating for Insulating Panels
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Solution Overview
Problem
Existing insulating construction panels with fibrous backing layers suffer from irregularities and hollow portions at the interface with polyurethane foam, reducing thermal insulation efficiency due to interactions between the fibrous layer and polyurethane foam or mineral finishing layer.
Innovation Solution
A backing layer with a reinforcing fibrous material and a coating layer comprising an aqueous dispersion of polymers and inert fillers, such as hollow glass microspheres, applied to provide thermal insulation properties, flexibility, mechanical resistance, and dimensional stability, while minimizing thermal conductivity to enhance overall panel performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fibrous backing layer is used to adhere to polyurethane foam, then adhesion is improved, but irregularities and hollow portions form at the interface reducing thermal insulation
Solution Approach 1:
A liquid composition comprising an aqueous dispersion of polymers and inert fillers (such as hollow glass microspheres) is applied to the fibrous backing layer as an intermediary substance. This composition fills the voids and irregularities at the interface between the fibrous layer and polyurethane foam, creating a smoother transition and reducing thermal bridges while maintaining adhesion.
Solution Approach 2:
Hollow glass microspheres (inert fillers) are incorporated into the liquid composition applied to the backing layer. These porous spherical structures fill irregularities and create a more uniform thermal insulation layer at the interface, reducing heat transfer through the backing layer assembly.
2Ease of operation
If the backing layer is made thin and flexible for winding, then ease of handling is improved, but thermal insulation performance decreases
Solution Approach 1:
The backing layer is constructed as a composite material system consisting of a fibrous reinforcing layer combined with a coating of liquid composition containing polymers and inert fillers (hollow glass microspheres). This composite structure provides both mechanical flexibility for handling and winding, and enhanced thermal insulation properties through the low-conductivity filler materials.
Solution Approach 2:
Hollow glass microspheres are integrated into the backing layer coating, creating a porous structure with trapped air pockets that provide thermal insulation. These hollow spherical structures maintain flexibility while significantly reducing thermal conductivity of the backing layer assembly.
3Strength
If conventional mineral fillers are used in the finishing layer, then mechanical properties are improved, but thermal conductivity increases reducing insulation efficiency
Solution Approach 1:
The thermal conductivity parameter of the finishing layer is changed by replacing conventional solid mineral fillers (high thermal conductivity) with hollow glass microspheres (low thermal conductivity). This parameter change reduces heat transfer through the backing layer while the polymer matrix maintains mechanical integrity and resistance.
Solution Approach 2:
The finishing layer is formulated as a composite material combining polymers with hollow glass microspheres. This composite provides both mechanical strength from the polymer matrix and thermal insulation from the hollow spherical fillers, achieving a balance between structural requirements and thermal performance.
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 proposed backing layer improves thermal insulation by reducing thermal conductivity, maintaining flexibility and mechanical resistance, and compensating for irregularities in the insulating foam layer, thereby enhancing the thermal efficiency of the panel.
Implementation Method 1
inert fillers, each having thermal conductivity in the range between 0.01 W/mK and 3 W/mK... hollow glass microspheres, each having a thermal conductivity value between 0.044 W/mK and 0.143 W/mK
Data Source
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AI summary
The invention relates to a backing layer (2) for an insulating construction panel (10; 20). Such a panel comprises a main layer (1) made of thermally insulating material comprising a first surface (1') and an opposite second surface (1"); - at least one backing layer connected to the main layer along at least one of such first and second surfaces. The backing layer comprises: - a reinforcing layer (4) made of fibrous material, - a coating layer (3) of the reinforcing layer. The coating layer is obtained by applying, to the reinforcing layer made of fibrous material, a compound comprising an aqueous dispersion of at least one polymer and inert fillers, each having thermal conductivity in the range between 0.01 W/mK and 3 W/mK, and then drying.