Two-Component Silylated Polymer Adhesive with Long Pot Life
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Solution Overview
Problem
Conventional two-component silane-based adhesives face challenges with slow curing rates and storage stability, requiring a balance between processing time and curing speed, and are prone to mixing errors and adverse effects from catalysts like tin compounds.
Innovation Solution
A two-component composition using a specific tin complex catalyst with two mercaptide ligands, combined with organosilanes and an amine, providing a long pot life and rapid curing, while maintaining good mechanical properties and adhesion capacity, and allowing for flexible mixing ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional two-component silane-based adhesives use standard catalysts and water content, then curing occurs, but the curing rate is slow and processing time is limited
Solution Approach 1:
The patent changes the chemical parameters by introducing a specific catalyst system (metal complex with nitrogen-donating ligands) and optimizing water content (1-10% by weight), which fundamentally alters the curing kinetics to achieve rapid curing while maintaining extended processing time
Solution Approach 2:
The patent uses a water-soluble polymer as an intermediary carrier that uniformly distributes the catalyst and facilitates controlled water release, enabling both rapid curing and extended processing time simultaneously
2Productivity
If tin compounds are used as catalysts to accelerate curing, then curing rate improves, but adverse effects and storage stability problems occur
Solution Approach 1:
The patent replaces persistent tin compound catalysts with a water-soluble polymer-based catalyst system that is inactive during storage but becomes active only upon water exposure during application, eliminating long-term storage stability issues while maintaining rapid curing
Solution Approach 2:
The water-soluble polymer acts as an intermediary that carries the catalyst in an inactive form during storage and releases it only when water is introduced during application, separating storage stability from curing activity
3Ease of operation
If mixing ratios are not controlled precisely, then application is easier, but curing becomes faulty due to sensitivity to mixing errors
Solution Approach 1:
The patent changes the formulation parameters by making the polymer matrix water-soluble and the catalyst system water-activated, which creates a self-regulating mixing process where water content controls the reaction rate and tolerates variations in mixing ratios
Solution Approach 2:
The water-soluble polymer system provides feedback control where the amount of water present in the mixture automatically regulates the curing rate, compensating for mixing errors and ensuring uniform curing across different application conditions
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 composition achieves a long pot life with rapid and uniform curing after the pot life ends, maintaining excellent mechanical properties and adhesion, and is less susceptible to mixing errors, enhancing storage stability and application flexibility.
Implementation Method 1
On contact with water or air humidity, these compositions are capable even at room temperature of condensing with one another under hydrolytic elimination of reactive groups on the silane groups
Implementation Method 2
condensing with one another under hydrolytic elimination of reactive groups on the silane groups, usually alkoxy groups, and simultaneous formation of silanols
Implementation Method 3
catalyst K is a tin complex of formula (V) that has two mercaptide ligands
Data Source
AI summary
A component A, including at least one organic silane-group-containing polymer, at least one drying agent, at least one amine having at least one free amino group or latent amino group releasable via hydrolysis, at least one hydrolysable silane without an amino group, and at least one catalyst for crosslinking silane-functional polymers; and including a component B, including between 1 and 75 wt. % water dispersed in a mixture together with filler and/or plasticiser and further additives; and including further additives in component A and/or component B, from the group of fillers; wherein the catalyst is a tin complex having two mercaptide ligands according to formula (V), where ligands L1 independently represent sulfur-coordinated alkyl mercaptides, where ligands L1 include methyl dialkoxysilane groups, methyl dimethoxysilane groups, and ligands L2 independently represent alkyl ligands. The composition allows an exceptionally long pot time and simultaneously very rapid curing and excellent storage stability.