Curable Organosilicon Composition Using Organoborane-Amine Complex
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Solution Overview
Problem
Current curable organosilicon compositions face issues with inhibition by agents like nitrogen, phosphorus, sulfur, and oxygen, leading to incomplete cures, high energy requirements, and reduced thermal stability, moisture resistance, and flexibility, particularly in applications requiring deep or confined curing.
Innovation Solution
A curable organosilicon composition combining a radical curable organopolysiloxane, an organoborane-amine complex, a condensation curable organosilicon compound, and a condensation cure catalyst, which employs a dual cure mechanism to rapidly cross-link and bond at reduced temperatures, reducing production costs and energy expenditure while enhancing thermal stability and moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrosilylation catalysts are used, then curing functionality is improved, but the system becomes sensitive to inhibiting agents like nitrogen, phosphorous, sulfur, tin, and arsenic
Solution Approach 1:
The patent changes the chemical parameter of the curing system by replacing transition metal catalysts with organoborane-amine complexes. This fundamental parameter change allows the system to maintain high curing functionality while becoming resistant to inhibition by nitrogen, phosphorous, sulfur, tin, and arsenic compounds.
Solution Approach 2:
The patent employs a catalyst system that is not susceptible to poisoning by common contaminants. The organoborane-amine complex acts as a robust, replaceable catalyst that maintains activity even in the presence of inhibiting agents, eliminating the need for expensive purification steps or catalyst replacement.
2Strength
If curing temperature is increased to remedy insufficient cure and bonding, then bonding performance is improved, but production costs and energy expenditure increase
Solution Approach 1:
The patent changes the kinetic parameters of the curing reaction by using an organoborane-amine complex catalyst that enables effective curing at lower temperatures. This parameter change in catalyst chemistry allows the system to achieve equivalent or superior bonding performance at reduced thermal energy input.
3Reliability
If condensation catalysts are used, then curing capability is provided, but moisture activation is required which limits effectiveness in deep or confined applications
Solution Approach 1:
The patent changes the activation mechanism parameter from moisture-dependent condensation catalysis to organoborane-amine complex catalysis. This parameter change enables the curing reaction to proceed effectively without requiring moisture activation, making it suitable for deep or confined applications where moisture access is limited.
4Reliability
If peroxide based systems are used, then curing is achieved, but high temperatures are required and storage stability at ambient temperatures is reduced
Solution Approach 1:
The patent changes the thermal parameter requirements by replacing peroxide-based curing systems with organoborane-amine complex catalysis. This parameter change allows curing to proceed at lower temperatures while maintaining ambient storage stability, eliminating the need for high temperature activation.
5Reliability
If organoborane-amine complex is used, then resistance to inhibition is improved, but high surface tension causes energy components to be depleted from surface resulting in incomplete cure
Solution Approach 1:
The patent creates a composite curing system that combines organoborane-amine complex catalysis with specific siloxane components and crosslinking agents. This composite formulation balances the high surface tension of the organoborane-amine complex with other components to ensure complete surface curing while maintaining resistance to inhibition.
6Strength
If acrylates and methacrylates are used for radical polymerization, then cross-linking is achieved, but thermal stability and moisture resistance are reduced
Solution Approach 1:
The patent formulates a composite organosilicon composition that integrates radical curable organopolysiloxanes with condensation curable organosilicon compounds and organoborane-amine complex catalysis. This composite approach achieves cross-linking through multiple mechanisms while maintaining the superior thermal stability and moisture resistance of the siloxane backbone.
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 complete curing with reduced surface wetness, improved thermal stability, and increased flexibility, suitable for various applications including adhesives, coatings, and electronic components, while minimizing energy consumption and production costs.
Implementation Method 1
an organoborane-amine complex comprising a complex of organoborane and an amine
Data Source
AI summary
A curable organosilicon composition includes a radical curable organosilicon compound, an organoborane-amine complex, a condensation curable organosilicon compound, a condensation cure catalyst, and a condensation-reactive cross-linking compound. The curable organosilicon composition may further include an amine-reactive compound. A method of forming the curable organosilicon composition introduces the organoborane-amine complex and the amine-reactive compound into separate reaction vessels. The curable organosilicon composition is used to form various articles.