Titanium-Ammonium Curing Catalyst for Stable Moisture Curing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing curing catalysts for silicone-based and modified silicone-based rubber compositions pose safety concerns due to endocrine disruptor effects and are prone to decomposition, leading to inconsistent curing rates and unstable cured products.
Innovation Solution
A curing catalyst composed of a titanium compound complexed with ammonium hydroxide, with a specific molar ratio, is used to enhance curing rates and ensure safety by avoiding 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 accelerated, but the safety concerns arise due to endocrine disruptor effects
Solution Approach 1:
The patent removes harmful tin-based catalysts from the curing system and replaces them with a safe alternative comprising a carboxylic acid and an amine. This extraction of the harmful substance while maintaining the curing function resolves the contradiction between productivity and safety.
Solution Approach 2:
The patent employs a simple, safe catalyst system using common carboxylic acid and amine components instead of persistent toxic tin compounds. This substitution with less harmful, easily replaceable materials addresses the safety concern while maintaining curing effectiveness.
2Object-affected harmful factors
If a combined catalyst of carboxylic acid and amine is used to avoid toxic substances, then safety is improved, but the curing rate becomes insufficient
Solution Approach 1:
The patent optimizes the molecular structure parameters of the carboxylic acid and amine components, specifically selecting compounds with appropriate chain lengths and functional groups to enhance catalytic activity. This parameter optimization allows the safe catalyst system to achieve sufficient curing rate.
Solution Approach 2:
The patent creates a composite catalyst system by combining specific carboxylic acid and amine components in defined ratios. This composite approach synergistically enhances the curing rate while maintaining the safety benefits of non-toxic materials.
3Productivity
If titanium acid ester compound is used as catalyst, then the curing process can proceed, but the compound is easily decomposed by moisture leading to variable curing rates
Solution Approach 1:
The patent removes moisture-sensitive titanium acid ester compounds from the catalyst system and replaces them with moisture-stable carboxylic acid and amine combinations. This extraction eliminates the decomposition issue while maintaining curing functionality.
Solution Approach 2:
The patent employs stable, non-sensitive carboxylic acid and amine catalysts that do not decompose upon moisture exposure, replacing the fragile titanium acid ester compounds. This substitution ensures consistent curing performance regardless of humidity conditions.
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 curing rate and stability, resulting in a safe and practical curing process for silicone-based rubber compositions, suitable for one-pack applications.
Implementation Method 1
A curing catalyst is used to accelerate the curing process in this reaction as described for example in JP-A-Hei8-41358, JP-A-Sho60-161457, JP-B-Sho63-42942, JP-A-2003-147220 or JP-B-5446265
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
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 catalyst composition obtained by forming a complex by reacting a titanium compound [B1] with an ammonium hydroxide [B2] in a mixture obtained by mixing the titanium compound [B1] and the ammonium hydroxide [B2], a molar ratio of the titanium compound [B1] to the ammonium hydroxide [B2] in the mixture is 1 to 2.8, the titanium compound [B1] is represented by Chemical Formula (1), the ammonium hydroxide [B2] is represented by Chemical Formula (2).