Perchlorate-Free Red Flare Composition
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Solution Overview
Problem
Existing red pyrotechnic compositions for signal flares contain environmentally objectionable perchlorate ingredients, leading to contamination of groundwater and higher perchlorate concentrations in drinking water supplies, necessitating the development of perchlorate-free alternatives that maintain performance.
Innovation Solution
A perchlorate-free red flare composition using magnesium fuel, strontium nitrate oxidizer, polyvinyl chloride color enhancer, and a two-part curable binder system, with specific weight percentages and particle sizes, which are mixed and processed to produce a red flame with comparable or superior luminous intensity, burn time, and color purity to traditional compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If perchlorate ingredients are used in red pyrotechnic compositions, then desired color performance is achieved, but environmentally harmful perchlorate residues are generated contaminating groundwater and drinking water supplies
Solution Approach 1:
The patent removes perchlorate from the pyrotechnic composition entirely, replacing it with alternative oxidizers such as potassium nitrate and strontium nitrate. This extraction of the harmful substance maintains the red color performance through strontium compounds while eliminating perchlorate residues from the formulation.
Solution Approach 2:
The patent modifies the chemical composition parameters by substituting perchlorate with different oxidizing agents and adjusting the ratios of magnesium fuel, strontium nitrate, and binder components. This parameter change achieves comparable luminous intensity and burn characteristics without the environmental harm of perchlorate.
2Object-generated harmful factors
If perchlorate-free compositions are developed, then environmentally harmful residues are eliminated, but performance comparability to in-service flares must be maintained
Solution Approach 1:
The patent creates a composite pyrotechnic formulation combining magnesium fuel with alternative oxidizers (potassium nitrate, strontium nitrate) and specific binder systems. This composite approach achieves the desired red color and burn performance while maintaining reliability comparable to traditional perchlorate-based flares.
Solution Approach 2:
The patent optimizes the weight percentages of each component—magnesium fuel (22-38%), strontium nitrate (40-60%), polyvinyl chloride color enhancer (11-16%), and binder system (4-7.5%)—to ensure the perchlorate-free composition matches or exceeds the performance of in-service flares.
3Object-generated harmful factors
If alternative oxidizers are used to replace perchlorate, then environmental harm is reduced, but formulation complexity increases
Solution Approach 1:
The patent simplifies the formulation by removing perchlorate and using alternative oxidizers that can be integrated into existing manufacturing processes. The binder system and other components remain largely the same, reducing formulation complexity while eliminating environmental harm.
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 perchlorate-free compositions achieve increased burn time and luminous intensity while eliminating environmentally harmful perchlorate residues, meeting or exceeding performance specifications for red signal flares and reducing the risk of accidental initiation.
Implementation Method 1
a magnesium fuel within the range of approximately twenty-two percent (22%) to approximately thirty-eight percent (38%) of the composition, the magnesium fuel including particles sizes selected from the group consisting of granulation 15, granulation 17, granulation 18, and mixtures thereof, a strontium nitrate oxidizer within the range of approximately forty percent (40%) to approximately sixty percent (60%) of the composition
Implementation Method 2
produce a red flame, the composition comprising... achieving increased burn time and luminous intensity
Implementation Method 3
a polyvinyl chloride color enhancer within the range of approximately eleven percent (11%) to approximately sixteen percent (16%) of the composition
Implementation Method 4
a two-part curable binder system within the range of approximately four percent (4%) to approximately seven point five percent (7.5%) of the composition, the binder system within the range of approximately seventy percent (70%) to approximately eighty percent (80%) epoxy and within the range of approximately twenty percent (20%) to approximately thirty percent (30%) curing agent
Data Source
AI summary
Perchlorate-free flare compositions are disclosed which, when burned, produce red smoke and flames. Methods of producing the compositions are also disclosed.