Curable Composition for Sealing Materials with Balanced Strength and Elongation
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Solution Overview
Problem
Curable compositions containing reactive silicon group-containing polymers often fail to achieve a balance between high elongation and strength in their cured products, necessitating further improvement.
Innovation Solution
A curable composition comprising reactive silicon group-containing polyoxyalkylene-based polymer with more than 1.0 reactive silicon groups at one terminal and reactive silicon group-containing (meth)acrylate-based polymer, with a specific structure and reaction process that includes alkali metal salt treatment, epoxy compound reaction, and hydrosilylation, to enhance the properties of the cured product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional reactive silicon group-containing polymers are used in curable compositions, then the composition can achieve basic sealing properties, but the cured product cannot simultaneously achieve sufficiently high elongation and sufficiently high strength
Solution Approach 1:
The invention uses a composite polymer system combining polyoxyalkylene-based polymer (A) with reactive silicon groups at terminals and (meth)acrylate-based polymer (B) with reactive silicon groups in the main chain. This composite structure allows the polyoxyalkylene component to provide elongation through its flexible ether backbone while the (meth)acrylate component contributes to strength through its rigid ester groups and crosslinking capability, thereby achieving both high elongation and high strength simultaneously in the cured sealing product
Solution Approach 2:
The invention strategically places reactive silicon groups at specific locations: terminal positions of polymer (A) and main chain positions of polymer (B). This local differentiation allows terminal crosslinking for strength while maintaining the flexible backbone structure for elongation, resolving the contradiction between strength and elongation in the cured product
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 cured product with significantly improved elongation and strength, meeting the requirements for high performance sealing materials.
Implementation Method 1
a reactive silicon group-containing polyoxyalkylene-based polymer (A) having more than 1.0 reactive silicon group on average at one terminal portion, and reactive silicon group-containing (meth)acrylate-based polymer (B)
Implementation Method 2
becomes a rubber elastic body by curing
Data Source
AI summary
Provided is a curable composition improved in elongation and strength after curing and a cured product obtained by curing the curable composition. A curable composition containing reactive silicon group-containing polyoxyalkylene-based polymer (A) having more than 1.0 reactive silicon group on average at one terminal portion, and reactive silicon group-containing (meth)acrylate-based polymer (B) having not less than 1.0 reactive silicon group on average per one molecule, which is represented by the formula (1): -SiRX2 (1) wherein R is a hydrocarbon group having 1 - 20 carbon atoms and optionally having substituent(s) which is/are a hetero atom-containing group or a halogen atom, and X is a hydroxyl group or a hydrolyzable group.