Photocurable Combustible Composition for Precision DLP/SLA Components
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Solution Overview
Problem
Conventional DLP and SLA photocuring 3D printing methods for combustible components face challenges in achieving high precision and complex structure formation, and existing compositions are inert and cannot sustain combustion in an oxygen-free environment.
Innovation Solution
A photocurable and combustible composition comprising an energetic prepolymer, such as acrylate-terminated poly(3-nitrato methyl-3-methyloxetane) and acrylate-terminated poly(glycidyl nitrate), a diluent, and a photoinitiator, which can be cured under UV light to form combustible components with self-sustaining combustion in an oxygen-free environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional molding methods (suction filter molding, rolling and pressing) are used to prepare combustible components, then the manufacturing process is simple, but the manufacturing cycle is long and the precision is poor (+0.5 mm)
Solution Approach 1:
The patent replaces conventional mechanical molding methods (suction filter molding, rolling and pressing) with DLP/SLA photocuring 3D printing technology. The mechanical forming process is substituted by a photopolymerization process where UV light cures photosensitive resin layer by layer to form precise combustible components with accuracy better than +0.5 mm, while eliminating the need for complex molds and forming equipment.
Solution Approach 2:
The patent changes the material state from solid combustible materials requiring mechanical forming to liquid photosensitive resin that undergoes photopolymerization. By controlling parameters such as UV light wavelength, intensity, and exposure time, the resin is cured into precise three-dimensional structures with high manufacturing precision without mechanical deformation.
2Manufacturing precision
If DLP and SLA photocuring 3D printing technology is used to prepare combustible components, then high molding accuracy and good surface quality are achieved, but the compositions currently available are inert and cannot sustain combustion in an oxygen-free environment
Solution Approach 1:
The patent develops a composite photosensitive resin system that combines the photosensitive properties needed for DLP/SLA printing with combustible functional groups (nitrate groups). The resin contains both the photopolymerization capability for high-precision manufacturing and the combustion capability for sustained burning in oxygen-free environments, resolving the contradiction between manufacturing precision and combustion reliability.
Solution Approach 2:
The patent modifies the chemical composition parameters of the photosensitive resin by incorporating energetic groups (nitrate groups) into the resin molecules. This changes the resin from an inert material to a combustible material that can sustain burning, while maintaining the photopolymerization properties necessary for high-precision 3D printing.
3Productivity
If traditional molding methods are used for combustible components, then the process is established, but complex structures are difficult to demould and the manufacturing cycle is long
Solution Approach 1:
The patent replaces mechanical molding processes with photocuring 3D printing. Instead of requiring complex molds for demoulding, the combustion component is built layer by layer through photopolymerization, allowing direct formation of complex three-dimensional structures without mechanical demoulding operations, thereby shortening the manufacturing cycle.
Solution Approach 2:
The patent uses digital model files as the basis for building objects layer by layer. The complex structure is designed and prepared in advance as digital data, which then guides the layer-by-layer photocuring process. This preliminary digital preparation eliminates the need for complex physical molds and accelerates the manufacturing process.
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
Enables the production of high-precision combustible components with complex structures that can self-sustain combustion in oxygen-free conditions, eliminating the need for molds and complex forming equipment.
Implementation Method 1
DLP and SLA photocuring 3D printing methods are a kind of 3D printing technology based on ultraviolet curing, where the photosensitive resin is cured layer by layer under an ultraviolet laser with a specific wavelength and intensity
Implementation Method 2
the components of the composition of the disclosure have an energetic group, i.e., a nitrate group, so that the composition can be subjected to self-sustaining combustion in an oxygen-free environment
Data Source
AI summary
Disclosed is a photocurable and combustible composition, including an energetic prepolymer, a diluent and a photoinitiator; where the energetic prepolymer is one of or a mixture of two of acrylate-terminated poly(3-nitratomethyl-3-methyloxetane) and acrylate-terminated poly(glycidyl nitrate). The photocurable and combustible composition has an energetic group, i.e., a nitrate group, which can be subjected to self-sustaining combustion in an oxygen-free environment, and the composition can be used to prepare combustible components such as combustible ordnance components.