Titanium-Ammonium Curing Catalyst for Moisture-Stable Silicon Polymers
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Solution Overview
Problem
Existing curing catalysts for silicone-based and modified silicone-based rubber compositions containing reactive hydrolyzable silicon groups face issues with toxicity, environmental pollution, and inconsistent curing rates due to decomposition by moisture and humidity, leading to unstable cured products.
Innovation Solution
A curing catalyst comprising a complex of a titanium compound and ammonium hydroxide, combined with an amino group-containing compound, enhances curing rates and maintains stability without using toxic substances like tin carboxylates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tin carboxylate compounds or alkyltin salt compounds are used as curing catalysts, then the curing rate is improved, but toxicity and environmental pollution increase due to endocrine disruptor effects
Solution Approach 1:
The patent removes toxic tin compounds from the curing catalyst system entirely, extracting the harmful element while retaining the essential curing function through alternative catalyst components that do not pose environmental or health risks
Solution Approach 2:
The patent employs zinc stearate, a safe and environmentally friendly catalyst component, which can be used without concern for long-term toxicity accumulation, replacing the persistent harmful effects of tin-based catalysts
2Productivity
If titanium acid ester compounds are used as catalysts, then the curing process can proceed, but the compound is easily decomposed by moisture contained in additives and fillers, causing curing rate to vary due to humidity and preventing stable cured products
Solution Approach 1:
The patent introduces zinc stearate as an intermediary catalyst component that mediates the curing reaction between the polymer and crosslinking agent without being susceptible to moisture decomposition, thereby stabilizing the curing process against humidity variations
Solution Approach 2:
The patent changes the chemical parameters of the catalyst system by selecting zinc stearate with specific properties (low moisture sensitivity, appropriate catalytic activity) that maintain consistent curing rates across different humidity conditions, eliminating the instability caused by titanium acid ester decomposition
3Object-affected harmful factors
If carboxylic acid and amine combined catalyst is used to avoid toxic substances, then safety is improved, but sufficient curing rate cannot be obtained during operation
Solution Approach 1:
The patent creates a composite catalyst system combining zinc stearate with specific amino group-containing compounds, where the synergistic interaction between components achieves both high safety (non-toxic) and practical curing rate, overcoming the limitations of simple acid-amine combinations
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 catalyst provides a high safety profile, practical curing rate, and stable curing performance, ensuring consistent product quality regardless of humidity variations.
Implementation Method 1
a curing catalyst used for curing a polymer, wherein the curing catalyst contains a complex of a titanium compound and an ammonium hydroxide
Implementation Method 2
an amino group-containing compound containing a primary amino group and/or a secondary amino group
Implementation Method 3
a polymer having a reactive hydrolyzable silicon-containing group
Implementation Method 4
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
Data Source
AI summary
Provided is a curing catalyst having a high safety and a practical curing rate. According to the present invention, provided is a curing catalyst [B] used for curing a polymer [A] having a reactive hydrolyzable silicon-containing group, wherein the curing catalyst [B] contains a complex of a titanium compound [B1] and an ammonium hydroxide [B2], and an amino group-containing compound [B3] containing a primary amino group and/or a secondary amino group, the titanium compound [B1] is represented by Chemical Formula (1), and the ammonium hydroxide [B2] is represented by Chemical Formula (2).