Titanium Carboxylate Amine Catalyst for Silicone Curing
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Solution Overview
Problem
Current curing catalysts for silicone-based and modified silicone-based rubbers, such as tin carboxylate compounds and titanium acid ester compounds, pose safety concerns and variability in curing speed due to humidity, leading to unstable adhesion of the cured product to substrates.
Innovation Solution
A combination of a titanium compound represented by the formula (R1—O)nTi-A4-n and a secondary or tertiary amine compound is used as a curing catalyst, where R1 is a hydrocarbon group with 1 to 10 carbon atoms, and A is a carboxylic acid residue, to enhance curing speed and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tin carboxylate compounds or alkyltin salt compounds are used as curing catalysts, then curing speed is improved, but safety and environmental compatibility deteriorate due to endocrine disruptor effects
Solution Approach 1:
The patent replaces persistent toxic catalysts (tin compounds) with safer alternative catalysts that achieve curing function without long-term environmental harm. The titanium carboxylate and zirconium carboxylate compounds provide the necessary catalytic activity for curing while being less harmful to living organisms, effectively substituting a harmful substance with a safer one that fulfills the same functional role.
Solution Approach 2:
The patent changes the chemical parameters of the catalyst system by specifying particular titanium carboxylate and zirconium carboxylate compounds with defined molecular structures and properties. By selecting catalysts with specific chemical characteristics (titanium or zirconium based carboxylates rather than tin-based compounds), the system achieves both safe operation and effective curing speed.
2Object-affected harmful factors
If titanium acid ester compounds are used as curing catalysts, then safety is improved, but curing speed stability deteriorates due to decomposition by moisture
Solution Approach 1:
The patent replaces moisture-sensitive titanium acid ester compounds with more stable titanium carboxylate and zirconium carboxylate compounds. These alternative catalysts maintain safety benefits while providing improved resistance to moisture-induced decomposition, ensuring consistent catalytic performance throughout the curing process regardless of humidity variations.
Solution Approach 2:
The patent changes the chemical stability parameters of the catalyst by selecting titanium carboxylate and zirconium carboxylate compounds that possess inherent resistance to moisture decomposition. This parameter change in catalyst chemistry (from acid ester to carboxylate structure) fundamentally improves the reliability and stability of curing speed under varying humidity conditions.
3Object-affected harmful factors
If titanium tetracarboxylate compound is used as curing catalyst, then safety is improved, but adhesion to substrate deteriorates
Solution Approach 1:
The patent changes the molecular structure parameters of the catalyst by selecting titanium carboxylate and zirconium carboxylate compounds with specific structural characteristics that differ from titanium tetracarboxylate. These structural modifications in the catalyst molecules enable both safe operation and improved adhesion properties in the cured product, resolving the adhesion deficiency of previous safe catalyst options.
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 proposed catalyst system significantly increases curing rate and adhesion of the organic polymer or organopolysiloxane to substrates, providing a safer, more stable, and cost-effective solution with improved physical properties.
Implementation Method 1
A curing catalyst is used to accelerate the curing process in this reaction
Implementation Method 2
the reaction mechanism of the process in which the silicone-based rubber and the modified silicone-based rubber become a cured product is based on a condensation reaction or an addition reaction of a reactive hydrolyzable silicon-containing group in the presence of water
Implementation Method 3
a reactive hydrolyzable silicon-containing group in the presence of water
Data Source
AI summary
The present invention provides a curing catalyst for an organic polymer or an organopolysiloxane, which has a high safety and a practical curing speed, and improves the adhesion of a cured product to a substrate, and can be produced at low cost.An aspect of the present invention provides a curing catalyst [B] for an organic polymer or an organopolysiloxane, which is used for curing an organic polymer [A1] or an organopolysiloxane [A2] having a reactive hydrolyzable silicon-containing group, whereinthe catalyst [B] contains a titanium compound [B1] represented by the following formula and a secondary amine compound or a tertiary amine compound [B2].(R1—O)nTi-A4-n (In the formula, R1 is a hydrocarbon group having 1 to 10 carbon atoms, and A is a carboxylic acid residue, and n is 1 or 2.)