Curable Composition for Adhesive Speed and Catalyst Reduction
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Solution Overview
Problem
Fast curing adhesives require a high amount of curing catalysts to achieve sufficient initial adhesive strength and surface curing rate when using polyoxyalkylene polymers with highly reactive trimethoxysilyl groups.
Innovation Solution
A curable composition containing a polyoxyalkylene polymer with a reactive silyl group equivalent of 0.15 mmol/g to 1.5 mmol/g and another polymer with 1.6 or more reactive silyl groups, allowing for rapid surface curing and excellent initial adhesion even with a small amount of catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a polyoxyalkylene containing a highly reactive trimethoxysilyl group is used as the base polymer for fast curing adhesives, then surface curing rate and initial adhesive strength are improved, but an enough amount of curing catalyst is required which increases cost and complicates the composition
Solution Approach 1:
The patent changes the key parameter of reactive silyl group equivalent from the conventional high range to a specific optimal range of 0.15-1.5 mmol/g. This parameter optimization allows the adhesive to achieve fast surface curing while reducing the required catalyst amount to 0.1-5 parts by weight per 100 parts of polyoxyalkylene, resolving the contradiction between curing speed and catalyst quantity
Solution Approach 2:
The patent creates a composite adhesive system combining polyoxyalkylene with reactive silyl groups (at optimized equivalents) with additional curing agents and catalysts. This composite approach balances multiple curing mechanisms, achieving both rapid surface curing and reduced catalyst dependency compared to using highly reactive trimethoxysilyl-containing polymers alone
2Strength
If a polyoxyalkylene containing a highly reactive trimethoxysilyl group is used, then initial adhesive strength is improved, but the composition becomes complex and requires careful formulation to balance curability and mechanical properties
Solution Approach 1:
The patent simplifies formulation complexity by establishing a clear parameter range for reactive silyl group equivalent (0.15-1.5 mmol/g) and corresponding catalyst amounts (0.1-5 parts by weight per 100 parts polyoxyalkylene). This systematic parameter definition reduces formulation trial-and-error while maintaining excellent initial adhesive strength and balanced curability
Solution Approach 2:
The patent applies local quality by targeting specific performance zones: the optimized reactive silyl group equivalent range specifically addresses initial adhesive strength development, while the controlled catalyst amount range manages overall curability. This localized optimization of different formulation components reduces overall composition complexity
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 rapid surface curing and excellent initial adhesion without the need for excessive catalysts, improving the balance of mechanical properties and durability in adhesive applications.
Implementation Method 1
reactive silicon-containing organic polymers by nature are crosslinked by siloxane bond formation following the hydrolysis or other reactions of the silyl group caused by moisture
Implementation Method 2
crosslinked by siloxane bond formation following the hydrolysis or other reactions of the silyl group
Data Source
AI summary
The present invention aims to provide a curable composition that is usable in fast curing adhesives and the like and has excellent curability and excellent initial adhesion. The aim is accomplished by use of a curable composition that contains a polyoxyalkylene polymer (a1) having a reactive silyl group (e.g., trimethoxysilyl group) equivalent of 0.15 mmol/g to 1.5 mmol/g and a polyoxyalkylene polymer (a2) having a reactive silyl group equivalent of 0.010 to 0.14 mmol/g. Preferably, the polymers (a1) and (a2) both have a backbone with at least one branch.