Liquid-Applied Drop Set for Gas-Generating Charge Dosing
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Solution Overview
Problem
Existing pyrotechnic ignition systems face issues with unreliable fixation and mechanical stability under extreme conditions, particularly at low temperatures and high accelerations, leading to detachment and failure, and are difficult to dose accurately.
Innovation Solution
A liquid-applied ignition composition using a water-dispersible vinyl ester copolymer matrix with pyrotechnic material, which undergoes pyrotechnic conversion at a material-specific temperature, ensuring precise dosing and improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a PMMA-based drip coating is used for the ignition charge, then the primer charge can be evenly embedded in the matrix, but the resulting drip set is very viscous and difficult to accurately dose using a dispensing system
Solution Approach 1:
The patent changes the physical parameters of the matrix material by using a water-soluble polymer instead of PMMA, and controls the water content (5-20 wt%) to achieve optimal viscosity for dosing while maintaining even distribution of the pyrotechnic material after application
2Ease of manufacture
If a PMMA-based drip coating is used for the ignition charge, then the primer charge can be applied as a liquid coating, but after curing the drip set undergoes significant shrinkage of up to 30% of the total volume, causing detachment from the glass feedthrough
Solution Approach 1:
The patent changes the chemical composition of the matrix to a water-soluble polymer system where water acts as a controlled evaporating solvent. By controlling the water content (5-20 wt%) and using a polymer with appropriate molecular weight and structure, the shrinkage during curing is significantly reduced compared to PMMA-based systems, preventing detachment while maintaining liquid applicability
Solution Approach 2:
The patent uses a polymer matrix that replicates the beneficial properties of PMMA (even embedding capability) while eliminating its harmful property (excessive shrinkage). The water-soluble polymer creates a similar homogeneous structure during curing but with controlled volume reduction
3Duration of action of stationary object
If a PMMA-based drip coating is used for the ignition charge, then the primer charge can be cured through evaporation, but during storage at low temperatures the fixation is weakened or complete detachment occurs
Solution Approach 1:
The patent changes the thermal properties of the matrix system by selecting a water-soluble polymer with appropriate glass transition temperature and molecular weight. The water content (5-20 wt%) is controlled to ensure proper curing through evaporation while maintaining flexibility and adhesion at low temperatures, preventing detachment during storage
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 composition provides enhanced mechanical stability, adherence to surfaces, and reduced shrinkage, maintaining reliability under extreme conditions, with improved handling and reduced failure rates.
Implementation Method 1
comprising a pyrotechnic material embedded in a matrix that undergoes pyrotechnic conversion at a material-specific conversion temperature
Implementation Method 2
after curing, the drip set undergoes significant shrinkage of up to 30% of the total volume
Data Source
AI summary
The present invention relates to a liquid-applied ignition composition for a system for providing a pyrotechnic energy release, comprising a pyrotechnic material embedded in a matrix which reacts pyrotechnically at a material-specific reaction temperature, wherein the matrix is formed by a water-dispersible organic polymer.