Perchlorate-Free Pyrotechnic Composition for Signal Flares
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Solution Overview
Problem
Existing pyrotechnic compositions used in signal or distress flares rely on perchlorate oxidizers, which contaminate groundwater and pose health risks, and attempts to replace them with less energetic oxidizers result in reduced flare performance or the use of hazardous metal fuels.
Innovation Solution
A perchlorate-free pyrotechnic composition comprising strontium nitrate, potassium nitrate, sulfur, polyvinyl chloride, paraffin oil, and a sawdust mixture, along with a specific ignition button composition, that maintains flare performance without using metal fuels or highly energetic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If perchlorate oxidizers are used in pyrotechnic compositions, then flare performance and color production are improved, but groundwater contamination and health risks increase
Solution Approach 1:
The patent removes perchlorate oxidizers from the pyrotechnic composition and replaces them with nitrate-based oxidizers (potassium nitrate and strontium nitrate). This extraction of the harmful substance eliminates groundwater contamination while maintaining the essential oxidizing function needed for flare performance through alternative chemical compounds.
Solution Approach 2:
The patent changes the chemical composition parameters by substituting perchlorate (ClO4-) with nitrate (NO3-) oxidizers. This parameter change in the chemical formula maintains the oxidizing capability required for combustion while eliminating the harmful environmental persistence of perchlorates in groundwater.
2Object-generated harmful factors
If perchlorate oxidizers are replaced with less energetic oxidizers, then perchlorate contamination is eliminated, but flare efficacy and energy output decrease
Solution Approach 1:
The patent uses a composite oxidizer system combining multiple nitrate compounds (potassium nitrate and strontium nitrate) in specific proportions. This composite approach compensates for the lower energy density of individual nitrate oxidizers by combining their effects, achieving sufficient total energy output while maintaining perchlorate-free composition.
Solution Approach 2:
The patent adjusts the concentration parameters of nitrate oxidizers to optimize energy output. By carefully controlling the ratio and amount of potassium nitrate and strontium nitrate, the composition achieves adequate energy density to maintain flare performance despite using less energetic oxidizers than perchlorate-based formulations.
3Reliability
If metal fuels are used to compensate for less energetic oxidizers, then flare performance is maintained, but manufacturing safety and environmental hazards increase
Solution Approach 1:
The patent removes metal fuels from the composition and relies solely on nitrate-based oxidizers for the combustion reaction. This extraction of hazardous metal components eliminates the associated safety risks during manufacturing and handling, while the nitrate oxidizers alone provide sufficient energy output for effective flare performance.
Solution Approach 2:
The patent uses readily available, non-hazardous nitrate compounds that can be safely handled during manufacturing. These oxidizers decompose completely during combustion without leaving persistent hazardous residues, replacing metal fuels with safer, more environmentally benign materials that pose minimal safety concerns during production.
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 solution effectively eliminates perchlorate contamination and health risks while maintaining the performance of traditional flares, avoiding the hazards associated with metal fuels and highly energetic materials.
Implementation Method 1
strontium nitrate, potassium nitrate, sulfur
Implementation Method 2
pyrotechnic composition includes from approximately sixty-seven percent (67%) to approximately seventy-eight percent (78%) of strontium nitrate [Sr(NO3)2], from approximately two percent (2%) to approximately eleven percent (11%) of potassium nitrate [KNO3], from approximately six percent (6%) to approximately fifteen percent (15%) of sulfur [S]
Data Source
AI summary
The invention provides for a perchlorate-free pyrotechnic composition. In one embodiment of the present invention, the pyrotechnic composition includes from approximately sixty-seven percent (67%) to approximately seventy-eight percent (78%) of strontium nitrate [Sr(NO3)2], from approximately two percent (2%) to approximately eleven percent (11%) of potassium nitrate [KNO3], from approximately six percent (6%) to approximately fifteen percent (15%) of sulfur [S], from approximately one percent (1%) to approximately ten percent (10%) of polyvinyl chloride, from approximately one percent (1.0%) to approximately four percent (4%) of paraffin oil, and from approximately zero percent (0%) to approximately two percent (2%) of sawdust mixture.