Metal Triflate Catalyst Curing for Energetic Material Binders
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Solution Overview
Problem
The use of isocyanates in curing hydroxyl terminated elastomers poses toxicity and safety hazards, limiting their application due to stringent safety regulations, and there is a need for an alternative curing method that is both effective and safe for producing crosslinked polymers suitable for energetic materials.
Innovation Solution
A method involving the formation of an admixture of hydroxy terminated oligomers, epoxy terminated oligomers, and metal trifluoromethanesulfonate salt catalysts, cured at elevated temperatures, which promotes crosslinking without the use of toxic isocyanates, and is compatible with energetic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If isocyanates are used as curing agents for hydroxyl terminated elastomers, then the curing reaction proceeds readily under mild conditions with high reactivity, but toxicity and safety hazards increase significantly
Solution Approach 1:
The patent introduces metal trifluoromethanesulfonate salts as intermediary catalysts to facilitate the curing reaction between hydroxyl terminated elastomers and crosslinking agents. These metal salt catalysts act as mediators that enable the reaction to proceed at acceptable rates without requiring toxic isocyanates, thus resolving the contradiction between reaction efficiency and safety
Solution Approach 2:
The patent changes the reaction parameters by using elevated temperatures (typically 60-100°C) combined with metal salt catalysts to achieve curing without isocyanates. This parameter change allows the system to maintain productive curing rates while eliminating the harmful isocyanate component, addressing both the productivity and safety concerns
2Strength
If isocyanates are used to cure elastomers, then effective crosslinked polymers are produced with good mechanical properties, but stringent safety regulations limit their application
Solution Approach 1:
Metal trifluoromethanesulfonate salts serve as intermediary catalysts that enable alternative curing pathways using safer reagents. These catalysts facilitate crosslinking reactions that produce polymers with mechanical properties comparable to isocyanate-cured materials, while expanding adaptability by removing regulatory restrictions
Solution Approach 2:
The patent extracts and eliminates the harmful isocyanate component from the curing system while retaining the essential crosslinking functionality. By removing isocyanates and replacing them with safer alternatives catalyzed by metal salts, the invention maintains mechanical performance while significantly improving safety and regulatory compliance
3Object-affected harmful factors
If alternative curing methods without isocyanates are used, then safety and environmental impact are improved, but achieving comparable mechanical properties becomes more difficult
Solution Approach 1:
The patent employs parameter changes by using elevated temperatures in combination with metal trifluoromethanesulfonate salt catalysts to achieve effective crosslinking without isocyanates. These parameter adjustments ensure that the alternative method produces cured polymers with mechanical properties comparable to traditional isocyanate-cured materials, while maintaining improved safety and environmental characteristics
Solution Approach 2:
Metal salt catalysts act as intermediaries that enable the alternative curing chemistry to proceed with sufficient efficiency. These catalysts facilitate the crosslinking reactions of safer reagent systems, ensuring that the resulting polymers achieve mechanical properties equivalent to isocyanate-cured materials despite using fundamentally different chemistry
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
This method produces crosslinked polymers with mechanical properties comparable to isocyanate-cured polymers, while being safer and more cost-effective, and is suitable for use in energetic material binders, offering improved safety and reduced environmental impact.
Implementation Method 1
forming an admixture of at least one hydroxy terminated oligomer, at least one epoxy terminated oligomer and at least one metal trifluoromethanesulfonate salt catalyst, and curing the resultant admixture at an elevated temperature
Implementation Method 2
curing the resultant admixture at an elevated temperature
Data Source
AI summary
This invention relates to a novel curing method of oligomers, using metal triflates, and particularly to the curing of hydroxyl terminated elastomers to achieve crosslinked polymers. The method finds particular use as an alternative cure methodology to replace isocyanate curing. There is further provided a cured and crosslinked polymer binder, which is particularly suitable and compatible for use with energetic materials.