DLP Light-Curing 3D Printing Combustible Lighting Shell and Performance Study

In order to further improve the luminous intensity of illuminating flares, the technique of 3D printing of the combustible shell of the illuminating flare using DLP light-curing was proposed, and the combustion spectrum of the combustible shell was made consistent with the combustion spectrum of the illuminating agent. A combustible illuminating candle shell slurry formulation was designed, with light-curing resin, magnesium powder, and sodium nitrate as the main components, and was printed and molded by DLP light-curing 3D printing technology to test its luminescence properties, mechanical properties, compatibility, and moisture absorption. The results show that the optimal formulation mass fraction of energy-containing slurry for the 3D printing of the combustible lighting candle shell is 50% for light-curing resin, 41% for sodium nitrate (NaNO3), and 9% for magnesium powder (Mg). The mechanical properties of the shell are good, with tensile strength up to 9.82 MPa and compressive strength of 102.86 MPa, and the compatibility of the components of the formulation is good, with stable combustion, and can provide 4.73% of light intensity for the lighting candle.