Curable Composition Using Reactive Silyl Groups for Elongation and Curing
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Solution Overview
Problem
Current curable compositions using polymers with reactive silyl groups face challenges in achieving both high elongation properties and rapid curability, especially when using non-organotin condensation catalysts, and often result in short tack times for contact adhesives.
Innovation Solution
A curable composition comprising a reactive silyl group-containing polyether polymer, optionally combined with a reactive silyl group-containing (meth)acrylic polymer, which features specific reactive silyl groups that facilitate rapid curing and excellent elongation properties without the use of organotin catalysts, ensuring a longer tack time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the amount of condensation catalyst is increased to achieve rapid curing, then curability is improved, but toxicity increases due to organotin compounds
Solution Approach 1:
The invention changes the chemical structure parameter of the reactive silyl group from conventional groups to specifically those having a halogen atom or electron-withdrawing group at the α-position relative to the silicon atom. This structural modification enables the polymer to achieve rapid curability with reduced catalyst amounts, thereby reducing toxicity while maintaining high productivity.
Solution Approach 2:
The invention replaces expensive and toxic organotin compounds with cheaper and less toxic non-organotin condensation catalysts. By using the specially designed reactive silyl groups, the system achieves effective curing with minimal catalyst usage, making the process more environmentally friendly and cost-effective.
2Productivity
If polymers with trialkoxysilyl groups at both terminals are used to achieve high curability, then curability is improved, but the cured products become hard and brittle
Solution Approach 1:
The invention applies local quality by specifically modifying the electronic environment at the silicon atom through the introduction of halogen atoms or electron-withdrawing groups at the α-position. This localized structural change enhances reactivity for rapid curing while the rest of the polymer structure maintains flexibility, preventing brittleness in the cured product.
Solution Approach 2:
The invention creates a composite effect by combining the reactive silyl group with specific polymer backbones (polyether or (meth)acrylic polymers). This composite structure allows the reactive end groups to provide rapid curability while the polymer backbone maintains elongation properties, achieving both high curability and flexibility.
3Productivity
If crosslink density is increased during curing to achieve high curability, then curability is improved, but the open time for contact adhesives is reduced
Solution Approach 1:
The invention enables a staged curing process where the reaction proceeds in a controlled manner. The special reactive silyl groups allow initial rapid crosslinking to establish basic structural integrity, while the reaction continues more gradually to achieve complete curing. This periodic action pattern maintains open time for adhesive application while ensuring rapid overall curability.
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 curability and excellent elongation properties, maintaining a long tack time, thus addressing the limitations of existing technologies by using specific reactive silyl groups in polyether and (meth)acrylic polymers.
Implementation Method 1
it is cross-linked by siloxane bond formation involving hydrolysis or other reactions of the silyl group
Implementation Method 2
siloxane bond formation involving hydrolysis or other reactions of the silyl group
Data Source
AI summary
An object of the present invention is to provide a curable composition that can be used as sealing materials, adhesives, and the like, has excellent curing properties, and gives a cured product excellent in elongation properties. The object can be attained by means of a curable composition comprising: a reactive silyl group-containing polyether polymer (A) that contains a reactive silyl group with high activity (e.g., (ClCH2) (CH3O)2Si-, (CH3OCH2) (CH3O)2Si-, or CH3(CH3O)2Si-CH2-NH-C (=O) -) ; and a reactive silyl group-containing polyether polymer (B) that contains a reactive silyl group (e.g., CH3(CH3O)2Si- or (CH3O)3Si-) different from that mentioned above and/or a (meth)acrylic polymer (C) containing a reactive silyl group that is not particularly limited.