Mineral-Polymer Decorative Panel Core for Thermoset Bonding
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Solution Overview
Problem
Existing methods struggle to bond thermoplastic core materials with thermosetting resin impregnated cellulose top layers without delamination or requiring complex processes, as thermoplastics soften at high temperatures, leading to uneven thicknesses and fractures.
Innovation Solution
A decorative panel with a core layer comprising a composite material of mineral material and polymer, having a Vicat softening temperature of at least 80°C and Shore D hardness of at least 85, directly bonded to a resin-impregnated paper top layer using thermosetting resin and polymeric adhesive, eliminating the need for intermediate adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high temperature is applied to cure thermosetting resin and activate adhesive, then bonding strength between core and top layer is improved, but thermoplastic core material softens and deforms
Solution Approach 1:
The patent modifies the core material composition by incorporating heat-resistant additives and adjusting the polymer matrix formulation to elevate the Vicat softening temperature from typical thermoplastic ranges (below 65°C for PVC) to at least 80°C. This parameter change enables the core to maintain dimensional stability at curing temperatures while preserving its thermoplastic bonding capabilities.
Solution Approach 2:
The patent creates a composite core material system combining thermoplastic polymer matrix with heat-resistant inorganic fillers and stabilizers. This composite structure provides both the flexibility and bonding properties of thermoplastics and the thermal stability required to withstand curing temperatures, effectively resolving the contradiction between softening behavior and bonding strength requirements.
2Reliability
If thermoplastic core material is used, then water resistance is improved, but scratch resistance of the panel is reduced
Solution Approach 1:
The patent employs a composite top layer structure combining resin-impregnated cellulose fibers with thermosetting resin matrices. This composite construction provides the scratch resistance and surface hardness characteristic of thermosetting systems while the underlying thermoplastic core maintains water resistance, allowing both properties to coexist in the multi-layer panel structure.
Solution Approach 2:
The patent divides the panel into functionally distinct layers: a thermoplastic core layer optimized for water resistance and flexibility, and a separate thermosetting resin-impregnated top layer optimized for scratch resistance and surface durability. This segmentation allows each layer to perform its specialized function without compromising the other properties.
3Reliability
If intermediate adhesive layer is added to bond core and top layer, then bonding reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the adhesive function directly into the thermoplastic core material formulation by incorporating reactive functional groups and adhesive promoters within the core matrix. This eliminates the need for a separate intermediate adhesive layer, as the core material itself provides both structural and bonding functions, thereby reducing manufacturing complexity while maintaining bonding reliability.
Solution Approach 2:
The thermoplastic core material is designed to be self-adhesive through integrated functional components that enable direct bonding to the thermosetting top layer during the curing process. The core material serves its own adhesive function without requiring external adhesive materials, simplifying the manufacturing process and reducing the number of production steps.
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 panel achieves waterproof and scratch-resistant properties while preventing deformation during production and use, ensuring dimensional stability and strength, allowing for efficient thermo bonding without intermediate adhesives.
Implementation Method 1
a thermosetting resin impregnating the top layer, for example melamine resin, is known to only cure at temperatures higher than 150 degrees Celsius
Implementation Method 2
the adhesion of a thermosetting top layer on a thermoplastic core necessitates the use of an adhesive layer comprising a thermosetting resin and a polymeric adhesive or epoxy
Data Source
AI summary
The invention relates to a decorative panel, in particular a floor panel, wall panel or ceiling panel, the panel comprising at least one core layer comprising an upper core surface and a bottom core surface, wherein the core layer comprises a composite material comprising at least one mineral material and at least one polymer and at least one top layer comprising at least one ply of resin impregnated paper, wherein the core layer has a predetermined Vicat softening temperature and wherein the upper core surface of the core layer has a predetermined Shore D hardness such that a panel is obtained which has good waterproof- and scratch resistant properties.