Cure-on-demand moisture-curable urethane fuel sealant
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Solution Overview
Problem
Aerospace sealants require materials with enhanced mechanical, chemical, and environmental resistance, but existing moisture-curable urethane-containing prepolymers lack sufficient tensile strength and elongation, especially when applied to diverse surfaces including metals and aged coatings.
Innovation Solution
Development of cure-on-demand sealant compositions incorporating moisture-curable urethane-containing prepolymers with urethane segments in the polymer backbone and a controlled release moisture cure catalyst, featuring polyalkoxysilyl groups for improved curing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If existing moisture-curable urethane-containing prepolymers are used, then the sealant can be applied to diverse surfaces, but the tensile strength and elongation are insufficient
Solution Approach 1:
The patent employs composite material strategy by combining moisture-curable urethane-containing prepolymers with polyalkoxysilyl groups and controlled release catalysts to create a multi-component sealant system that achieves both high tensile strength and reliable sealing performance
Solution Approach 2:
The patent changes the chemical parameters of the prepolymer system by incorporating polyalkoxysilyl groups and controlled release moisture cure catalysts, transforming the curing mechanism to achieve superior tensile strength and elongation properties
2Stability of the object's composition
If existing moisture-curable urethane-containing prepolymers are used, then the sealant can be applied to diverse surfaces, but the elongation is insufficient
Solution Approach 1:
The patent uses composite material approach by integrating polyalkoxysilyl-modified urethane prepolymers with controlled release catalysts, creating a sealant composition that maintains both high elongation and sealing reliability
Solution Approach 2:
The patent modifies the compositional parameters by incorporating polyalkoxysilyl groups and controlled release moisture cure catalysts, enabling the sealant to achieve enhanced elongation while maintaining composition stability
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 compositions exhibit enhanced tensile strength and elongation, providing superior sealing performance on various surfaces, including metals and aged coatings, while maintaining fuel resistance across a wide temperature range.
Implementation Method 1
cure-on-demand moisture-curable urethane-containing prepolymers and compositions thereof for use in aerospace sealant applications. The cure-on-demand moisture-curable urethane-containing prepolymers are terminated with polyalkoxysilyl groups and are curable in the presence of moisture.
Implementation Method 2
The compositions contain a controlled release moisture cure catalyst.
Data Source
AI summary
Cure-on-demand, moisture-curable, urethane-containing prepolymers having urethanes incorporated into a sulfur-containing prepolymer backbone and compositions thereof for use in sealant applications are disclosed. The cure-on-demand moisture-curable urethane-containing prepolymers are terminated with polyalkoxysilyl groups. The compositions contain a controlled-release moisture cure catalyst. Compositions containing the prepolymers provide cured sealants exhibiting improved tensile strength.