3D Printed Pyrotechnic Binder Softening Temperature Control
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Solution Overview
Problem
The three-dimensional printing technique is not suitable for depositing pyrotechnic compositions due to the high softening temperature required, which poses a safety risk from the energetic charge present in these compositions.
Innovation Solution
A composite pyrotechnic product is manufactured using a mixture with a crosslinked polymer polyol binder having a low bridging ratio of 0.2 to 0.6, allowing for a moderate softening temperature between 50°C and 90°C, and a high mass content of energetic charge, ensuring safe 3D printing without the risk of additional crosslinking during the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pyrotechnic compositions are deposited by 3D printing using conventional binders with high softening temperatures, then the structural integrity of the deposited material is maintained, but safety risks increase due to the energetic charge present in the composition
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by using a crosslinked polyol polymer with a specific bridging ratio (NCO/OH ratio) between 0.2 and 0.6. This parameter change reduces the softening temperature from conventional high temperatures to a moderate range (50-90°C), enabling safe 3D printing while maintaining structural integrity through controlled crosslinking.
Solution Approach 2:
The patent creates a composite binder system combining crosslinked polyol polymer with specific crosslinking agents and chain extenders. This composite material approach allows tuning of the bridging ratio to achieve the optimal balance between softening temperature and structural stability, resolving the contradiction between safety and integrity.
2Ease of manufacture
If the binder is made more fluid to enable 3D printing deposition, then the deposition process becomes feasible, but the deposit loses shape maintenance capability
Solution Approach 1:
The patent adjusts the viscosity and flow characteristics of the binder by controlling the crosslinking degree through the bridging ratio parameter. The optimized ratio (0.2-0.6) provides sufficient crosslinking for shape maintenance while keeping the binder fluid enough for 3D printing deposition, resolving the contradiction between manufacturability and shape retention.
3Reliability
If the softening temperature is reduced to enable safe 3D printing, then safety is improved, but the binder becomes too fluid and cannot maintain deposit shape
Solution Approach 1:
The patent uses the bridging ratio parameter to precisely control the balance between softening temperature and binder stability. By maintaining the NCO/OH ratio between 0.2 and 0.6, the system achieves moderate softening temperature (50-90°C) sufficient for safety while retaining enough structural stability through controlled crosslinking to maintain deposit shape.
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
This method enables the secure deposition of a pyrotechnic product with a high energy charge, maintaining the desired shape and safety by controlling the softening temperature, thus overcoming the safety concerns associated with traditional 3D printing of pyrotechnic materials.
Implementation Method 1
thermal crosslinking of the mixed premix to obtain the binder
Implementation Method 2
the material to be deposited is generally in the form of a filament and passes through a heated nozzle to be softened
Implementation Method 3
pyrotechnic compositions typically include an energetic charge
Data Source
Figure 1~2
AI summary
The invention relates to a method for manufacturing a composite pyrotechnic product, comprising at least: - the formation of the pyrotechnic product by deposition of a mixture by three-dimensional printing, said mixture comprising at least: • a binder comprising a polyol polymer crosslinked by a crosslinking agent and having an NCO/OH bridging ratio between 0.2 and 0.6, and • an energy charge.