Moisture-Crosslinking Adhesive for Residue-Free Removal
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Solution Overview
Problem
Conventional adhesives used for fastening articles to substrates often result in damage when attempting to separate them, with residues left on both the article and substrate, especially on rough surfaces like wood or concrete, and lack sufficient shear and tensile strength for certain applications.
Innovation Solution
An adhesive composition comprising 58-80% moisture-crosslinkable polymer with alkoxysilane terminal radicals, 8-20% silica, 4-15% oligomer, and 0.01-3% crosslinking catalyst, which allows for easy separation through adhesive failure without leaving residues, providing shear strength of 3-20 kg/cm2 and tensile strength of 5-30 kg/cm2, suitable for various substrates including wood and concrete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional fixing adhesives are used to fasten articles to substrates, then strong bonding is achieved, but separation causes damage and leaves residues on the article and substrate
Solution Approach 1:
The adhesive composition changes its bonding parameters over time through a two-stage mechanism: initially providing strong adhesion for fastening, then enabling controlled separation through hydrolysis of silane bonds and reduction of adhesion strength, allowing residue-free removal
Solution Approach 2:
The adhesive is a composite formulation combining polymer base resin, silane crosslinking agents, and specific additives that work together to provide both strong initial bonding and controlled separability, with the silane components enabling reversible bonding behavior
2Strength
If adhesive joint thickness is increased to improve bonding, then cohesion is enhanced, but separation becomes more difficult and leaves more residues
Solution Approach 1:
The adhesive's internal parameters change during service through moisture-induced hydrolysis of silane bonds, which reduces the adhesive joint's cohesion over time, enabling easy separation even of thicker joints without leaving residues
3Strength
If adhesive is formulated for strong adhesion to rough substrates, then bonding strength is improved, but separation leaves difficult-to-remove residues
Solution Approach 1:
The adhesive's adhesion parameters dynamically change through silane bond hydrolysis, providing strong initial adhesion to rough substrates like wood and concrete, then progressively reducing adhesion strength to enable complete residue-free separation from these challenging surfaces
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 easy separation of articles from substrates without damaging either, with improved peelability and strength characteristics, facilitating the use of adhesives in diverse applications like wall and ceiling fastening without leaving residues.
Implementation Method 1
a moisture-crosslinkable polymer (A) having an alkoxysilane terminal radical
Data Source
AI summary
The present invention involves an adhesive composition and a method for its-use, especially by consumers, for fastening various articles, for example for the purposes of fitting out or decorating dwellings.