Titanium-Ammonium Curing Catalyst for Stable Moisture-Curable Polymers
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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 variability in curing rates due to humidity, leading to unstable curing processes.
Innovation Solution
A curing catalyst comprising a complex of a titanium compound and ammonium hydroxide, represented by specific chemical formulas, is used to enhance curing rates and improve safety and storage stability.
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 accelerated, but toxicity and environmental pollution increase due to endocrine disruptor effects
Solution Approach 1:
The patent replaces persistent toxic tin-based catalysts with biodegradable iron-based catalysts. The iron compound catalyst system uses environmentally benign materials that do not accumulate in the environment or pose long-term toxicological risks, thereby eliminating the harmful effects of tin compounds while maintaining effective curing acceleration through the iron-catalyzed crosslinking reaction
Solution Approach 2:
The patent changes the chemical nature of the catalyst from tin-based to iron-based compounds, fundamentally altering the toxicological profile while maintaining catalytic functionality. This parameter change in the catalyst composition enables the system to achieve the same curing rate acceleration without the harmful endocrine disruptor effects associated with tin compounds
2Productivity
If titanium acid ester compounds are used as curing catalysts, then the curing process can proceed, but the curing rate varies due to humidity and the compound decomposes easily, leading to unstable curing
Solution Approach 1:
The patent replaces humidity-sensitive titanium acid ester compounds with iron compound catalysts that exhibit superior stability in moist environments. The iron-based catalyst system does not decompose easily upon exposure to humidity, ensuring consistent catalytic activity and reliable curing rate regardless of environmental moisture conditions
Solution Approach 2:
The patent changes the catalyst composition from titanium acid esters to iron compounds, fundamentally altering the humidity sensitivity parameter. The iron-based catalyst system demonstrates insensitivity to moisture content variations, thereby stabilizing the curing rate and eliminating the decomposition issues associated with titanium acid ester compounds
3Object-affected harmful factors
If carboxylic acid and amine combined catalyst is used to eliminate toxicity, then safety is improved, but the curing rate becomes insufficient during operation
Solution Approach 1:
The patent changes the catalyst system from a combined carboxylic acid-amine system to an iron compound-based catalyst system. This parameter change in catalyst chemistry enables the system to achieve both non-toxicity and high curing rate performance, as the iron catalyst effectively accelerates the crosslinking reaction while maintaining environmental safety
Solution Approach 2:
The patent employs iron compound catalysts that are environmentally benign and do not pose toxicological risks, while simultaneously achieving effective curing rate acceleration. The iron-based catalyst system replaces the insufficient carboxylic acid-amine system with a more efficient and safe alternative
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 titanium-ammonium hydroxide complex catalyst provides a high curing rate, stability, and low toxicity, ensuring a practical and stable curing process without crystal precipitation.
Implementation Method 1
A curing catalyst used for curing of a polymer, a production method for the curing catalyst, a moisture-curable composition, and a production method for a cured product. The curing catalyst contains a complex of a titanium compound and an ammonium hydroxide
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
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
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 [C] of a titanium compound [B1] and an ammonium hydroxide [B2], the titanium compound [B1] is represented by Chemical Formula (1), and the ammonium hydroxide [B2] is represented by Chemical Formula (2).