Silane Curable Composition With Dual Catalysts for Fast Curing
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Solution Overview
Problem
Existing curable compositions containing organic polymers with bifunctional dialkoxysilyl groups and non-tin catalysts suffer from insufficient curing rates, necessitating an improvement in curing speed without using toxic organotin compounds.
Innovation Solution
A curable composition is formulated using an organic polymer with bifunctional dialkoxysilyl groups, combined with a silane condensate and a curing catalyst comprising an amidine compound and a titanium compound, to enhance curing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a non-tin catalyst is used in a curable composition containing an organic polymer with a bifunctional dialkoxysilyl group, then the toxicity is reduced, but the curing rate becomes insufficient
Solution Approach 1:
The patent combines two different catalyst systems (amidine compound and titanium compound) to work synergistically. The amidine compound activates the silane condensate while the titanium compound catalyzes the hydrolysis of the dialkoxysilyl groups, creating a dual-catalysis system that achieves both non-toxicity and high curing rate
Solution Approach 2:
The silane condensate acts as an intermediary substance that bridges the organic polymer and the catalyst system. It mediates the curing process by forming siloxane bonds that crosslink the polymer chains while being activated by the non-tin catalyst combination, enabling fast curing without organotin compounds
2Strength
If an organic polymer with a bifunctional dialkoxysilyl group is used, then the cured product has high elongation and flexibility, but the hydrolyzability is low resulting in insufficient curing rate
Solution Approach 1:
The patent changes the chemical parameters of the system by introducing a silane condensate with specific structural characteristics (formula 4 with R6 as methyl or ethyl group, and R7 as hydrocarbon group). This parameter change enhances the overall hydrolyzability and reactivity of the composition while preserving the beneficial mechanical properties from the dialkoxysilyl groups
Solution Approach 2:
The patent creates a composite curable composition that integrates multiple components: organic polymer with bifunctional dialkoxysilyl groups, silane condensate with specific structure, amidine compound catalyst, and titanium compound catalyst. This composite system achieves both high elongation/flexibility and fast curing rate through synergistic interactions among the 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 fast curability and maintains the benefits of non-toxicity, providing a suitable alternative to organotin catalysts with improved curing rates.
Implementation Method 1
The organic polymer having at least one reactive silicon group in the molecule can be crosslinked by a hydrolysis reaction of silyl groups, due to moisture even at room temperature, etc. accompanied by siloxane bond formation.
Implementation Method 2
The curable composition containing an organic polymer having a reactive silicon group is usually cured using a silanol condensation catalyst such as an organotin compound having a carbon-tin bond typified by dibutyltin bis(acetylacetonato).
Data Source
AI summary
A curable composition that contains a silane compound, a non-tin-based curing catalyst, and an organic polymer having a bifunctional dialkoxysilyl group as a reactive silicon group is provided. The curable composition exhibits quick curability. In the curable composition, an amidine compound and a titanium compound are used in combination as the curing catalyst, and a silane condensate having a specific structure is used as the silane compound.