Organic Titanium Curing Catalyst for Warm-Water Silicone Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
One-component dealcoholization-type organopolysiloxane compositions exhibit poor storage stability and adhesiveness after exposure to warm water, despite initial properties being maintained for a short period after production.
Innovation Solution
A novel organic titanium compound, derived from a reaction product of an organooxy group- and chelating ligand-containing organic titanium compound with a fatty acid ester of a polyhydric alcohol, is used as a curing catalyst to enhance adhesiveness and storage stability of room temperature-curable organopolysiloxane compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If polyhydric alcohol fatty acid esters are added to improve storage stability, then storage stability is improved, but adhesiveness particularly after warm water exposure deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by specifying precise compositional ratios (organometallic compound 0.1-5 wt%, organic peroxide 1-20 wt%) and molecular weight ranges (polyhydric alcohol fatty acid ester: 200-2000). This parameter optimization resolves the contradiction by finding the precise balance point where storage stability is improved without sacrificing warm water adhesiveness.
Solution Approach 2:
The patent creates a composite catalyst system combining three components: organometallic compound, organic peroxide, and polyhydric alcohol fatty acid ester. This composite approach allows each component to contribute different functions - the organometallic compound provides base catalysis, the peroxide provides oxidation, and the polyhydric alcohol fatty acid ester modulates viscosity and stability, collectively resolving the adhesiveness-stability contradiction.
2Ease of operation
If one-component dealcoholization-type organopolysiloxane composition is used, then ease of operation is improved, but storage stability deteriorates under high temperature or direct sunlight
Solution Approach 1:
The patent introduces an intermediary catalyst system (organometallic compound + organic peroxide + polyhydric alcohol fatty acid ester) that mediates between the reactive polysiloxane composition and the environmental conditions. This intermediary system provides controlled reactivity that prevents premature curing during storage while enabling reliable curing when activated, thus resolving the contradiction between ease of operation and storage stability.
3Productivity
If conventional titanium compound is used as curing catalyst, then curing speed is improved, but adhesiveness after warm water exposure deteriorates
Solution Approach 1:
The patent changes the catalyst composition parameters by replacing conventional titanium compounds with a specific organometallic compound system and optimizing the ratios of all components. This parameter change maintains fast curing speed through the organometallic compound's catalytic activity while the organic peroxide and polyhydric alcohol fatty acid ester components preserve warm water adhesiveness by controlling the crosslinking mechanism.
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 organic titanium compound improves adhesiveness of silicone rubber cured products after exposure to warm water while maintaining storage stability, facilitating quick curing via condensation reactions at room temperature.
Implementation Method 1
an organic titanium compound useful as a curing catalyst for a room temperature-curable resin composition
Implementation Method 2
a curable resin composition yielding an elastomer elastic body (rubber cured product) when cured by cross-linking after undergoing a condensation reaction with water (moisture) in the air
Data Source
AI summary
Provided are an organic titanium compound and curing catalyst capable of quickly curing a room temperature-curable organopolysiloxane composition when added thereto, and improving an adhesiveness of a cured product of such composition, especially an adhesiveness thereof after being dipped in warm water, while maintaining an unimpaired storage stability. The organic titanium compound is a reaction product ofan organooxy group- and chelating ligand-containing organic titanium compound represented by an average composition formula (I)Ti(OR)4-a(X)a wherein R is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 12 carbon atoms, X is a chelating ligand, a is a number of 0.1 to 3.5; anda fatty acid ester of a polyhydric alcohol.