Organosilicon RTV-1 Compositions with Titanium Catalysts
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Solution Overview
Problem
Existing one-part room-temperature curable compositions based on organosilicon compounds face challenges with toxic organotin compounds, inferior curing properties, short skin formation time, and storage stability, especially in acidic systems, which limits their use in applications like pharmaceuticals and food-related industries.
Innovation Solution
A composition combining an organotitanium compound with a curing agent of the formula R′Si(OOCR″)3, where R′ is C3-C6 alkyl and R″ is C1-C6 alkyl, providing superior skin formation time, curing properties, and storage stability without discoloration or crystallization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organotin compounds are used as curing catalysts, then good storage stability is achieved, but high toxicity is generated
Solution Approach 1:
The invention extracts and removes the harmful organotin compounds from the curing catalyst system while retaining the essential curing function through alternative catalysts (zinc carboxylate, zirconium carboxylate, or rare earth carboxylate) combined with titanium catalysts, thereby eliminating toxicity while maintaining storage stability
Solution Approach 2:
The invention introduces an intermediary system consisting of zinc carboxylate, zirconium carboxylate, or rare earth carboxylate in combination with titanium catalysts to mediate the curing process, replacing the direct role of toxic organotin compounds while achieving both non-toxicity and storage stability
2Object-affected harmful factors
If titanium catalysts are used in acidic RTV-1 compositions, then non-toxic curing is achieved, but skin formation time becomes too short
Solution Approach 1:
The invention changes the chemical parameters of the catalyst system by combining titanium catalysts with zinc carboxylate, zirconium carboxylate, or rare earth carboxylate, which modifies the curing kinetics to achieve appropriate skin formation time while maintaining non-toxic properties
Solution Approach 2:
The invention creates a composite catalyst system by combining titanium catalysts with zinc carboxylate, zirconium carboxylate, or rare earth carboxylate, where the synergistic interaction between the components achieves both non-toxicity and controlled skin formation time
3Object-affected harmful factors
If titanium catalysts are used in acidic RTV-1 compositions, then non-toxic curing is achieved, but storage stability deteriorates
Solution Approach 1:
The invention introduces zinc carboxylate, zirconium carboxylate, or rare earth carboxylate as intermediary substances that work synergistically with titanium catalysts to stabilize the composition during storage while maintaining non-toxic properties
Solution Approach 2:
The invention develops a composite catalyst system combining titanium catalysts with zinc carboxylate, zirconium carboxylate, or rare earth carboxylate, where the interaction between components provides both non-toxicity and improved storage stability
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 combination of organotitanium compounds with the specified curing agent results in compositions with excellent curing properties, suitable skin formation time, and improved storage stability, making them safer and more versatile for various applications, including those in warm and humid environments.
Implementation Method 1
Curing of RTV-1 compositions based on organosilicon compounds is initiated at room temperature when they are exposed to atmospheric humidity
Implementation Method 2
a curing catalyst comprising an organotitanium compound
Data Source
AI summary
One-part room-temperature curable compositions (RTV-1 compositions) based on organosilicon compounds are less toxic compared to conventional compositions containing organotin compounds and, at the same time, have excellent curing properties, a skin formation time which allows proper handling and tooling, and excellent storage stability. The compositions contain: at least one organosilicon compound containing condensable groups; at least one curing agent having the formula R′Si(OOCR″)3, wherein R′ is C3-C6 alkyl, and R″ is C1-C6 alkyl; at least one organotitanium compound curing catalyst; and at least one filler.