Thermally Triggered Silyl Hydride Curing via Amine Blocking
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Solution Overview
Problem
Lewis acid catalyzed reactions, such as the Piers-Rubinsztajn reaction, are highly reactive and difficult to control, making it challenging to create stable one-part systems that can be triggered to react upon demand, especially when exposed to UV light or elevated temperatures.
Innovation Solution
A composition comprising a silyl hydride, silanol, or silyl ether, a Lewis acid catalyst, and a specific amine that acts as a thermally triggered blocking agent, allowing the system to remain stable at 23°C but release the Lewis acid catalyst upon heating to facilitate rapid curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Lewis acid catalyst is used to catalyze the reaction between silyl hydride and silyl ether/silanols, then the reaction speed is improved, but the system becomes unstable and reacts too quickly at 23°C
Solution Approach 1:
An amine blocking agent is introduced as an intermediary substance that temporarily binds to the Lewis acid catalyst, preventing it from catalyzing the reaction between silyl hydride and silyl ether/silanols at 23°C. This blocking agent acts as a mediator that controls the interaction between the catalyst and reactants, allowing the system to remain stable during storage while maintaining the ability to react when needed.
Solution Approach 2:
The patent utilizes temperature as a parameter to control the blocking/unblocking of the Lewis acid catalyst. At 23°C, the amine blocking agent remains bound to the catalyst, preventing reaction. When heated to elevated temperatures (e.g., 60-100°C), the thermal energy causes the blocking agent to dissociate from the catalyst, activating its catalytic function and enabling rapid reaction. This temperature-dependent parameter change allows precise control over reaction timing.
2Productivity
If UV light sensitive blocking agents are used with Lewis acids, then the system can be triggered to react, but the system needs to be kept in the dark and UV penetration is difficult for thick compositions
Solution Approach 1:
The patent replaces the UV light-based triggering mechanism with a thermal triggering mechanism. Instead of using photons (electromagnetic radiation) to initiate the reaction, the system uses heat (thermal energy) to trigger the dissociation of the amine blocking agent from the Lewis acid catalyst. This substitution eliminates the need for specialized UV lighting equipment, dark storage conditions, and complex UV penetration considerations, simplifying the overall operation while maintaining controlled reaction initiation.
3Ease of operation
If the system is designed as a one-part system, then the ease of operation is improved, but the stability at 23°C is compromised due to rapid reaction
Solution Approach 1:
The patent merges multiple functional components into a single one-part system: the Lewis acid catalyst, the silyl hydride, the silyl ether/silanols, and the amine blocking agent are all combined in one composition. The blocking agent serves as an internal control mechanism that allows this simplified one-part system to maintain stability at 23°C while still enabling rapid reaction when heated, eliminating the need for separate storage containers or complex mixing procedures.
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 stable one-part reactive system that remains stable at 23°C and can be triggered to cure within minutes at elevated temperatures, providing a 90°C cure speed of 15 minutes or less, suitable for applications like coatings and adhesives.
Implementation Method 1
Heating the composition releases the Lewis acid catalyst from the amine blocking agent and allows it to trigger reaction between the silyl hydride and silyl ether and/or silanols
Implementation Method 2
Strong Lewis acids are known catalysts for numerous reactions. For instance, the Piers-Rubinsztajn (PR) reaction between silyl hydride and silyl ether is a well-known reaction catalyzed by a strong Lewis acid
Data Source
AI summary
A composition contains a mixture of silyl hydride, a silanols and/or silyl ether, a Lewis acid catalyst and an amine having the following formula: R1R2R3N; where the nitrogen is not a member of an N═C—N linkage and each of R1, R2, and R3 is independently selected from a group consisting of hydrogen, alkyl, substituted alkyl, and conjugated moieties; and wherein at least one of R1, R2 and R3 is a conjugated moiety connected to the nitrogen by a conjugated carbon.