Near-Infrared Reflecting Skin Coatings for Thermal Protection
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Solution Overview
Problem
Current skin and face paints with thermal reflective properties fail to protect the skin from intense thermal fluxes, as they conduct heat to the skin and can ignite under such conditions, exacerbating burns and injuries.
Innovation Solution
Development of novel compositions comprising near-infrared reflecting pigments and hydrogels swollen with aqueous solution or simulated sweat, which reflect heat away from the skin and divert thermal energy through evaporative cooling, providing protection against intense thermal fluxes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If metal particles are used for thermal reflection in face paint, then thermal camouflage is improved, but heat conduction to skin increases causing burn risk
Solution Approach 1:
The patent changes the material parameter from metal particles to ceramic particles, fundamentally altering the thermal conduction properties while maintaining thermal reflection capabilities. This parameter change resolves the contradiction by selecting a material with inherently lower thermal conductivity that still provides the desired optical performance.
Solution Approach 2:
The patent employs a composite formulation combining ceramic particles with a water-based gel matrix containing hydrophilic polymers. This composite structure achieves both thermal reflection (from ceramic particles) and reduced heat conduction (from the water-based gel), simultaneously addressing both requirements of the contradiction.
2Ease of operation
If traditional gel materials like petroleum jelly are used in face paint, then ease of application is improved, but flammability increases under intense thermal flux
Solution Approach 1:
The patent fundamentally changes the chemical composition parameter from hydrocarbon-based petroleum jelly to water-based gel with hydrophilic polymers. This parameter change eliminates the flammability issue while preserving the desired ease of application and skin compatibility properties through careful selection of polymer constituents.
Solution Approach 2:
The patent employs a formulation designed for single-use or limited-duration application, accepting that the coating will degrade or wash off rather than providing long-term protection. This approach prioritizes safety (non-flammable) and ease of removal over durability, aligning with the principle of using simpler, safer materials for temporary applications.
3Loss of information
If infrared transparent coatings are used for thermal camouflage, then camouflage effectiveness is improved, but thermal protection capability deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the functional properties at different levels: the ceramic particles provide thermal reflection for camouflage, while the water-based gel matrix provides thermal protection through evaporative cooling. Different regions of the coating perform different functions, resolving the contradiction between camouflage and protection.
Solution Approach 2:
The patent creates a multi-functional coating that simultaneously achieves thermal camouflage (through infrared reflection from ceramic particles) and thermal protection (through evaporative cooling from the water-based gel). The single coating system performs multiple functions that were previously achieved by separate systems.
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 effectively prevent or lessen skin burns by reflecting intense heat and maintaining skin integrity, even under extreme conditions like flash fires or explosions, while being easy to apply and remove.
Implementation Method 1
compositions comprising near infrared reflecting pigments... reflecting heat away from the skin
Implementation Method 2
hydrogels swollen with aqueous solution and/or with simulated sweat, whereby the skin of the wearer is protected from damage due to intense external thermal flux
Implementation Method 3
diverting thermal energy to a complementary evaporative cooling mechanism
Data Source
AI summary
The present invention provides novel topically-applied skin and face coating and paint compositions comprising near infrared reflecting pigments and hydrogels swollen with aqueous solution and/or with simulated sweat. The invention further provides methods of making and using the compositions. The novel compositions protect the skin of the wearer from damage due to intense external heat or thermal flux and simultaneously divert thermal energy to a complementary evaporative cooling mechanism. The compositions protect skin from external thermal fluxes, conform to skin chemistry, and are easy to apply and remove.