Moisture-Curable Composition with Titanium-Ammonium Catalyst
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Solution Overview
Problem
Existing moisture-curable silicone-based rubber compositions face issues with curing rates and stability due to the use of catalysts like tin carboxylate compounds, titanium acid esters, and quaternary ammonium salts, which can be harmful and affected by humidity, leading to inconsistent curing and safety concerns.
Innovation Solution
A moisture-curable composition using a titanium compound-ammonium hydroxide complex as a curing catalyst and a UV absorber comprising benzotriazole-based, salicylate-based, or cyanoacrylate-based compounds to enhance curing rates and stability while avoiding harmful substances.
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 safety concerns arise due to endocrine disruptor effects on living organisms
Solution Approach 1:
The patent removes harmful tin-based curing catalysts from the composition entirely and replaces them with a combined catalyst system using carboxylic acid and amine, which achieves adequate curing without endocrine disruptor effects
Solution Approach 2:
The patent changes the chemical nature of the curing catalyst from tin-based compounds to a combined carboxylic acid-amine system, fundamentally altering the catalytic mechanism while maintaining curing functionality and eliminating harmful effects
2Productivity
If titanium acid ester compounds are used as curing 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 uses carboxylic acid and amine catalysts that are stable in storage and not easily decomposed by moisture, providing consistent catalytic activity throughout the product's shelf life and during application regardless of humidity conditions
Solution Approach 2:
The patent introduces a combined carboxylic acid-amine catalyst system that mediates the curing reaction more reliably than titanium acid esters, providing a stable and predictable curing rate that is not adversely affected by environmental moisture or humidity variations
3Object-affected harmful factors
If a combined catalyst of carboxylic acid and amine is used to avoid harmful substances, then safety is improved, but a sufficient curing rate cannot be obtained during operation
Solution Approach 1:
The patent combines carboxylic acid and amine into a single catalytic system where the two components work synergistically to achieve adequate curing rates without the harmful effects of tin-based catalysts. The combination allows the system to overcome the individual limitations of each component
4Object-affected harmful factors
If quaternary ammonium salt is used as a catalyst, then the composition can be formulated without harmful substances, but a sufficient curing rate cannot be obtained during construction
Solution Approach 1:
The patent changes from using quaternary ammonium salt to a combined carboxylic acid-amine catalyst system, which provides superior catalytic activity for achieving adequate curing rates during construction while maintaining safety by avoiding harmful substances
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 composition achieves a high safety profile with a practical curing rate and improved weather resistance, suppressing coloration issues and ensuring consistent performance.
Implementation Method 1
a curing catalyst (B), which contains a complex of a titanium compound (B1) and an ammonium hydroxide (B2)
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 UV absorber (C) contains at least one of a benzotriazole-based compound, a salicylate-based compound, a cyanoacrylate-based compound, and a triazine-based compound
Data Source
AI summary
Provided is a moisture-curable composition having a high safety and a practical curing rate. According to the present invention, provided is a moisture-curable composition containing a polymer [A] having a reactive hydrolyzable silicon-containing group, a curing catalyst [B], and a UV absorber [C], wherein the curing catalyst [B] contains a complex of a titanium compound [B1] and an ammonium hydroxide [B2], the titanium compound [B1] is represented by Chemical Formula (1), the ammonium hydroxide [B2] is represented by Chemical Formula (2), and the UV absorber [C] contains at least one of a benzotriazole-based compound, a salicylate-based compound, a cyanoacrylate-based compound, and a triazine-based compound.