Polyurethane-Polyurea Composite for Blast Mitigation
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Solution Overview
Problem
Existing mitigation measures for explosive blast threats often fail to effectively harden a target's envelope when maximizing stand-off distance is not possible, particularly in military and urban civilian applications, leading to damage and debris penetration.
Innovation Solution
A composite article featuring a substrate with a polyurethane-polyurea layer, composed of a reaction product of an isocyanate component with toluene diisocyanate and an isocyanate-reactive component, which minimizes debris field and protects the interior from blast and fragment damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing mitigation measures are used to harden a target's envelope, then protection against explosive blast threats is provided, but the measures fail to effectively minimize debris field and prevent debris penetration when stand-off distance cannot be maximized
Solution Approach 1:
The patent employs a composite material system consisting of a polyurethane-polyurea layer combined with a substrate. The polyurethane-polyurea layer is specifically engineered to absorb blast energy and minimize debris field, while the substrate provides structural support. This composite approach resolves the contradiction by combining materials with complementary properties to achieve both debris penetration resistance and reliable protection effectiveness in close-proximity blast scenarios.
Solution Approach 2:
The patent utilizes parameter changes in the polyurethane-polyurea layer composition, specifically varying the isocyanate component (10% to 90% toluene diisocyanate by weight) and isocyanate-reactive component ratios to optimize blast mitigation performance. By adjusting these chemical parameters, the material achieves enhanced energy absorption and debris field minimization capabilities, effectively preventing debris penetration while maintaining protection reliability.
2Object-affected harmful factors
If stand-off distance is maximized between target and explosive, then blast damage is reduced, but this is not possible in military applications such as combat vehicles and civil applications such as buildings in urban settings
Solution Approach 1:
The patent applies a polyurethane-polyurea layer that functions as a flexible protective shell on the substrate. This thin film approach provides blast damage mitigation without requiring significant space, enabling implementation on combat vehicles and urban buildings where maximizing stand-off distance is not feasible. The flexible nature of the layer allows it to conform to various structural geometries, enhancing application flexibility across different platforms.
3Object-affected harmful factors
If a polyurethane-polyurea layer is applied to a substrate, then blast and fragment protection is provided by minimizing debris field, but the manufacturing process requires precise control of isocyanate and isocyanate-reactive component ratios
Solution Approach 1:
The patent defines specific parameter ranges for the isocyanate component (10% to 90% toluene diisocyanate by weight) and isocyanate-reactive component to achieve optimal blast protection performance. While precise control is required, the patent provides clear manufacturing guidelines and formulations that facilitate consistent production. The parameter specifications enable manufacturers to achieve the desired debris field minimization effect through controlled variation of component ratios.
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 composite article significantly reduces damage and debris penetration, providing effective blast and fragment protection for structures and occupants by maintaining the integrity of the polyurethane-polyurea layer during explosive events.
Implementation Method 1
The polyurethane-polyurea layer includes a reaction product of an isocyanate component having from about 10% to about 90% of a toluene diisocyanate, by weight of the isocyanate component, and an isocyanate-reactive component having amine-terminated and/or hydroxyl-terminated compounds
Implementation Method 2
The polyurethane-polyurea layer disposed on a substrate... in the event of an explosion near a structure utilizing the composite article, the composite article mitigates damage to the structure by minimizing the field of debris
Data Source
AI summary
A composite article and method for manufacturing the same are disclosed. In one embodiment, a polyurethane-polyurea layer is disposed on a substrate. The polyurethane-polyurea layer includes a reaction product of an isocyanate component having from about 10% to about 90% of a toluene diisocyanate, by weight of the isocyanate component, and an isocyanate-reactive component having amine-terminated and/or hydroxyl-terminated compounds. The polyurethane-polyurea layer provides blast and fragment protection from explosive devices as well as ballistic mitigation.