Curable Silicone Composition with Low-Volatility Hydrosilylation Inhibitor
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Solution Overview
Problem
Existing curable silicone compositions face issues with hydrosilylation reaction inhibitors being partially or completely removed with the organic solvent or volatilized during hot-melt mixing or thermoforming, leading to changes in curability and storage stability.
Innovation Solution
A curable silicone composition comprising organopolysiloxane resin, organopolysiloxane with silicon-bonded hydrogen atoms, bis(alkynyloxysilyl)alkane, and a platinum group metal-based hydrosilylation catalyst, with specific ratios and additives to prevent inhibitor removal and volatilization, ensuring minimal change in curability and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydrosilylation reaction inhibitors (silane compounds or organosiloxanes obtained by silylating or siloxylating acetylene alcohols) are blended in a hot-melt curable silicone composition, then the curability can be controlled, but when the organic solvent is removed or during hot-melt mixing/thermoforming, the inhibitor is partially or completely removed/volatilized, causing changes in curability and storage stability
Solution Approach 1:
The invention changes the chemical structure parameters of the hydrosilylation reaction inhibitor by introducing silicon-bonded alkoxy groups or hydroxyl groups (silanol groups) to the bis(alkynyloxysilyl)alkane. This structural modification increases the boiling point and reduces volatility, preventing the inhibitor from being removed during solvent evaporation or hot-melt processing, thereby maintaining consistent curability and storage stability
Solution Approach 2:
The invention creates a composite inhibitor structure by combining the bis(alkynyloxysilyl)alkane backbone with additional functional groups (alkoxy or hydroxyl groups). This composite structure provides both the inhibition function and enhanced thermal stability, preventing loss during processing while maintaining curability
2Ease of manufacture
If the composition is subjected to hot-melt mixing or thermoforming, then processing can be performed, but the hydrosilylation reaction inhibitor volatilizes, causing changes in curability and storage stability
Solution Approach 1:
The invention modifies the thermal parameters of the inhibitor by adding silicon-bonded alkoxy or hydroxyl groups, which significantly increases the boiling point. This allows the composition to undergo hot-melt mixing and thermoforming without the inhibitor volatilizing, ensuring both ease of manufacture and storage stability are maintained
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 maintains consistent curability and storage stability by preventing inhibitor loss during solvent removal and hot-melt processing, enhancing transparency and mechanical strength.
Implementation Method 1
a curable silicone composition, comprising at least: (A) an organopolysiloxane resin having at least two aliphatic unsaturated monovalent hydrocarbon groups in one molecule... (B) an organopolysiloxane having at least two silicon atom-bonded hydrogen atoms in a molecule... (D) a platinum group metal-based hydrosilylation catalyst
Data Source
AI summary
The present disclosure relates to a curable silicone composition comprising (A) an organopolysiloxane resin having at least two aliphatic unsaturated monovalent hydrocarbon groups per molecule, (B) an organopolysiloxane having at least two silicon-bonded hydrogen atoms per molecule, (C) a bis(alkynyloxysilyl)alkane represented by the general formula as disclosed and described herein, and (D) a platinum group metal-based hydrosilylation catalyst. The curable silicone composition provides the advantage that, when an organic solvent used in the preparation of the curable silicone composition is removed, removal of the hydrosilylation reaction inhibitor along with the organic solvent is suppressed, and thus there is little change in curability and storage stability.