Amine-Enhanced Curing Catalyst for Moisture-Stable Polymer Cure
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Solution Overview
Problem
Existing curing catalysts for silicone-based and modified silicone-based rubber compositions, such as tin carboxylate compounds, titanium acid ester compounds, and quaternary ammonium salts, face issues with toxicity, environmental pollution, and inconsistent curing rates due to 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, avoiding the use of toxic substances like tin.
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
Solution Approach 1:
The patent replaces toxic tin-based catalysts with zinc oxide, a safe and environmentally friendly alternative. The zinc oxide catalyst achieves sufficient curing rates without the harmful effects of tin compounds, effectively substituting a toxic substance with a safer one while maintaining functional performance.
Solution Approach 2:
The patent modifies the catalyst system by combining zinc oxide with specific amine compounds and controlling the water content within 0.1-10 parts by mass per 100 parts of polymer. This parameter optimization enables the safe catalyst system to achieve practical curing rates comparable to traditional tin-based systems.
2Reliability
If titanium acid ester compounds are used as catalysts, then the curing process can proceed, but the curing rate varies due to moisture and humidity leading to unstable cured products
Solution Approach 1:
The patent replaces moisture-sensitive titanium acid ester compounds with zinc oxide, which is inherently stable and not easily decomposed by moisture. This substitution eliminates the curing rate variations caused by humidity while maintaining the ability to proceed with the curing process.
Solution Approach 2:
The patent optimizes the water content parameter within a specific range (0.1-10 parts by mass per 100 parts of polymer) and combines zinc oxide with amine compounds to create a catalyst system that is insensitive to environmental moisture, ensuring stable curing rates and consistent cured product quality.
3Object-affected harmful factors
If combined catalyst of carboxylic acid and amine is used to avoid toxic substances, then safety is improved, but sufficient curing rate cannot be obtained
Solution Approach 1:
The patent creates a composite catalyst system combining zinc oxide with specific amine compounds (such as triethylenediamine, diethylene triamine, or ethylenediamine). This composite approach synergistically enhances the curing rate while maintaining the safety advantages of using non-toxic zinc oxide instead of tin-based catalysts.
Solution Approach 2:
The patent optimizes the proportions of zinc oxide, amine compounds, and water content within specific ranges to achieve practical curing rates. By carefully controlling these parameters, the safe catalyst system attains curing performance sufficient for construction applications.
4Reliability
If quaternary ammonium salt is used as catalyst, then the curing process can proceed, but sufficient curing rate cannot be obtained during construction
Solution Approach 1:
The patent replaces quaternary ammonium salts with zinc oxide combined with amine compounds and optimizes the water content parameter. This modification maintains the feasibility of the curing process while significantly improving the curing rate to meet practical construction requirements.
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 achieves a high and consistent curing rate, ensuring a stable and safe curing process with improved physical properties of the cured product, while being cost-effective.
Implementation Method 1
A curing catalyst used for curing a polymer, the curing catalyst containing a complex of a titanium compound and an ammonium hydroxide
Implementation Method 2
a polymer having a reactive hydrolyzable silicon-containing group
Implementation Method 3
an amino group-containing compound containing a primary amino group and/or a secondary amino group
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, whereinthe 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), andthe ammonium hydroxide [B2] is represented by Chemical Formula (2).