Parquet Flooring Adhesive Composition for Dimensional Stability
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Solution Overview
Problem
Adhesives used for laying parquet flooring face challenges with deformation due to temperature and moisture changes, leading to issues like cupping and shear stress, particularly in wide-block flooring, where existing adhesives lack sufficient stiffness and mechanical strength while also being prone to failure under tensile and shear stresses.
Innovation Solution
A moisture-crosslinkable adhesive composition comprising 25-50% of a crosslinkable epoxy resin, 40-65% of a polymer with a polyoxyalkylene and polyurethane main chain, and 0.5-6% of a ketimine precursor, along with an inert filler, which crosslinks to provide improved stiffness and adhesion, maintaining deformability and reducing the risk of failure under stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesives are used for laying parquet flooring, then the laying process is simple and quick, but the adhesive joint lacks sufficient stiffness and mechanical strength, leading to deformation and cupping over time
Solution Approach 1:
The adhesive composition combines multiple components: polyether polymer with silane groups, epoxy resin, and ketimine crosslinking agent. This composite formulation creates a crosslinked network structure that provides both stiffness (Young's modulus >10 MPa) and mechanical strength, resolving the contradiction between strength and complexity by integrating multiple functional materials working synergistically
Solution Approach 2:
The invention changes the chemical parameters of the adhesive by controlling the ratio of silane-containing polyether (25-50%), epoxy resin (25-50%), and ketimine (0.5-6%). This parameter optimization ensures the crosslinked adhesive achieves sufficient stiffness while maintaining flexibility to accommodate wood movement, preventing cupping and deformation
2Strength
If the adhesive joint is made stiffer to resist deformation, then mechanical strength improves, but the adhesive loses deformability and becomes prone to failure under stress
Solution Approach 1:
The invention optimizes the chemical composition parameters to achieve a balance between stiffness and flexibility. The polyether polymer with silane groups provides the crosslinking network for stiffness (Young's modulus >10 MPa), while the epoxy resin and controlled crosslinking density maintain deformability. This parameter tuning allows the adhesive to resist deformation while accommodating wood movement without failing
Solution Approach 2:
The ketimine crosslinking agent acts as an intermediary that controls the crosslinking process. It reacts with the silane groups to form a controlled crosslinked network, providing stiffness while maintaining flexibility. The intermediary crosslinking mechanism allows the adhesive to achieve mechanical strength without becoming overly rigid, preventing stress concentration and failure
3Strength
If solvent-based adhesives are used to achieve high adhesion, then bonding strength is improved, but volatile organic compounds are released causing environmental and health issues
Solution Approach 1:
The invention changes the fundamental composition parameter from solvent-based to water-based or solvent-free formulation. The adhesive uses polyether polymer with silane groups that can crosslink without requiring volatile solvents. This parameter change eliminates harmful VOC emissions while maintaining high adhesion strength through the crosslinked network structure, resolving the contradiction between bonding strength and environmental harm
Solution Approach 2:
The invention replaces the mechanical evaporation process of solvent-based adhesives with a chemical crosslinking mechanism. Instead of relying on solvent evaporation to form the adhesive bond, the system uses chemical reaction (silane crosslinking) to create the bonding network. This substitution eliminates the need for volatile solvents while achieving equivalent or superior adhesion strength through chemical bonding
4Object-generated harmful factors
If aqueous dispersion adhesives are used to avoid solvents, then environmental friendliness is improved, but the adhesive becomes unsuitable for treated parquet flooring
Solution Approach 1:
The adhesive composition combines polyether polymer with silane groups, epoxy resin, and ketimine in a formulation that provides both environmental friendliness and versatility. The crosslinking mechanism works effectively on both untreated and treated wood surfaces, including varnished and oiled parquet flooring. The composite formulation creates strong adhesion through chemical bonding that is not inhibited by surface treatments, resolving the contradiction between eco-friendliness and adaptability
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 adhesive composition achieves a Young's modulus greater than 10 MPa, with tensile and shear elongation at break of at least 30% and 200%, respectively, ensuring improved mechanical strength and adhesion while minimizing the risk of failure, suitable for immediate use after application.
Implementation Method 1
said polyether reacts, at ambient temperature, with the moisture (present in the atmosphere, the substrate and/or the parquet flooring) via the silyl group, which comprises at least one hydrolyzable group bonded to the silicon atom
Implementation Method 2
a wood-based covering is composed of a living material which is liable, once attached by adhesive bonding, to react over time by deformations with variations in temperature and in moisture content of the surrounding environment
Data Source
AI summary
1) Moisture-crosslinkable adhesive composition comprising:from 25% to 50% of a composition (a) formed of a crosslinkable epoxy resin and of a polymer having a polyoxyalkylene or polyurethane main chain connected to a hydrolyzable terminal alkoxysilyl group;from 0.5% to 6% of a ketimine (b); andfrom 40% to 65% of an inert inorganic or organic filler (c).2) Method for laying a wood-based covering, in particular a wide-block parquet flooring, on a flat rigid support comprising the distribution of an effective amount of said adhesive composition in the form of a substantially homogeneous layer.