Titanium Alkoxide Curable Composition Stabilized by Bidentate Chelating Agent
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Solution Overview
Problem
Titanium alkoxide-based curable compositions are unstable to moisture and lack the curing properties of organotin compounds, while guanidine compounds, used as curing agents, are unstable and low in activity.
Innovation Solution
A curable composition is formulated with a titanium alkoxide stabilized by a bidentate chelating agent and a guanidine compound in a specific molar ratio, suitable for use in synthetic resins with reactive silicon or polyurethane resins, to achieve improved stability and curing properties comparable to organotin compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If titanium alkoxide is used as a curable composition, then safety is improved (titanium dioxide is highly safe), but stability deteriorates (unstable to moisture and easily hydrolyzed)
Solution Approach 1:
A bidentate chelating agent is introduced as an intermediary substance that coordinates with titanium alkoxide to form a stable complex. This chelating agent acts as a mediator between the titanium alkoxide and moisture, preventing direct hydrolysis while maintaining the safety benefits of titanium-based catalysts.
Solution Approach 2:
The invention creates a composite catalytic system combining titanium alkoxide with a bidentate chelating agent. This composite material integrates the safety advantages of titanium compounds with the stability benefits of chelating agents, resolving the contradiction between safety and stability.
2Stability of the object's composition
If titanium alkoxide is coordinated with ethyl acetoacetate or hydroxycarboxylic acid ester to improve stability, then stability is improved, but curing properties deteriorate (cannot exhibit curing properties comparable with organotin compound)
Solution Approach 1:
The invention changes the chemical parameters of the chelating agent, specifically selecting bidentate chelating agents with particular structural characteristics that optimize both stability and curing activity. By adjusting the molecular structure and coordination properties of the chelating agent, the system achieves comparable curing properties to organotin compounds while maintaining enhanced stability.
3Productivity
If guanidine compound is used as a curing agent, then curing activity is improved, but stability deteriorates (very unstable compound)
Solution Approach 1:
The bidentate chelating agent serves as an intermediary that stabilizes the guanidine compound through coordination interactions. This intermediary substance protects the unstable guanidine compound from degradation while allowing it to maintain its high curing activity when activated.
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 provides a high-stability, high-curing-performance synthetic resin, with enhanced molecular weight increase, tensile strength, and hot water resistance, surpassing the limitations of titanium alkoxide and guanidine compounds used alone.
Implementation Method 1
a bidentate chelating agent for stabilizing the titanium alkoxide
Implementation Method 2
to produce a siloxane bond of a crosslinkable silyl group-containing polymer
Implementation Method 3
a guanidine compound... in a particular proportion to thereby provide a curable composition for a resin produced from an organic polymer having a reactive silicon group
Data Source
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AI summary
[Problem] To provide a curable composition having high stability and excellent curing properties. [Solution] The present invention relates to a curable composition, and a cured synthetic resin using same, that functions as a curing catalyst for a synthetic resin. The curable composition contains (A) a titanium alkoxide, (B) a bidentate organic chelating agent that stabilizes the titanium alkoxide and (C) a guanidine compound. The molar ratio of the titanium alkoxide (A), the bidentate organic chelating agent (B), and the guanidine compound (C) is 1:0.5-3:0.5-2.