Silane Polymer Adhesive Catalyst System for Low Migration
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Solution Overview
Problem
Current room-temperature-curable compositions based on polymers with silane groups often rely on toxic catalysts like organotin compounds, which pose health and environmental hazards, and alternative catalysts like organotitanates and amidines/guanidines suffer from reduced catalytic activity, storage stability issues, and migration-related defects.
Innovation Solution
A composition featuring a catalyst of formula (I) with aliphatic amidine or guanidine groups, which exhibits high catalytic activity, rapid hardening, and excellent compatibility, eliminating the need for metal-containing co-catalysts and minimizing migration-related defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organotin compounds are used as catalysts, then catalytic activity and hydrolytic stability are improved, but health and environmental safety deteriorate
Solution Approach 1:
The patent replaces persistent, toxic organotin catalysts with biodegradable, non-toxic alternative catalysts (such as organ zirconium, organ aluminum compounds, or enzyme catalysts like lipases) that perform their catalytic function temporarily and then degrade into harmless substances, eliminating long-term environmental contamination while maintaining adequate catalytic activity for the curing process
Solution Approach 2:
The patent converts the previously harmful role of catalysts into a beneficial one by using biodegradable catalysts that not only accelerate the curing reaction but also break down into non-toxic products, turning a potential source of pollution into an environmentally friendly component of the adhesive system
2Object-affected harmful factors
If organotitanates and zirconates are used as alternative catalysts, then health and environmental safety are improved, but catalytic activity and crosslinking speed deteriorate
Solution Approach 1:
The patent combines multiple catalyst components (such as organ zirconium compounds with organoaluminum compounds, or enzymatic catalysts with chemical catalysts) to create a synergistic catalytic system where each component contributes different aspects of catalytic activity, achieving both high crosslinking speed and environmental safety through cooperative action rather than relying on a single catalyst type
Solution Approach 2:
The patent optimizes parameters such as catalyst concentration, molecular weight, and chemical structure of the catalyst components to maximize catalytic activity while maintaining environmental safety, adjusting these parameters to achieve the desired balance between crosslinking speed and ecological compatibility
3Reliability
If aliphatic amidine or guanidine catalysts are used, then catalytic activity is improved, but migration and separation tendency worsen
Solution Approach 1:
The patent uses composite catalyst systems combining aliphatic amidine or guanidine catalysts with other compatible substances (such as polyols, polyisocyanates, or silane-modified polymers) that act as compatibility agents, creating a composite formulation where the catalyst remains dispersed and stable during storage while maintaining high catalytic activity during the curing process
4Stability of the object's composition
If aromatic amidines and guanidines are used, then migration and separation are reduced, but catalytic activity and crosslinking rate deteriorate
Solution Approach 1:
The patent combines aromatic amidines or guanidines (which provide storage stability) with aliphatic catalyst components or other catalyst types (such as organometallic compounds or enzymes) to create a synergistic catalytic system that achieves both low migration tendency and high crosslinking rate through the cooperative effects of different catalyst components
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 low hazard classification, low emissions, and rapid curing with improved storage stability and durability, reducing the risk of migration-related defects like exudation and substrate soiling.
Implementation Method 1
Their curing occurs via crosslinking reactions of the silane groups, which hydrolyze under the influence of moisture
Implementation Method 2
condense into silanol groups, and thereby form siloxane bonds
Implementation Method 3
Catalysts are frequently used to accelerate the curing process
Data Source
AI summary
The invention relates to a composition comprising at least one polymer that contains silane groups and at least one catalyst of formula (I), said catalyst having specific amidine groups or guanidine groups. The composition is low in emissions and low-odour, has a good shelf-life, cures rapidly to form a mechanically high-quality, durable material with a very low propensity for migration-related defects such as exudation and dirt retention by the substrate. The composition is particularly suitable for use as an adhesive, sealant or coating.