In-situ, simultaneous milling, coating and curing of brittle particulates pre-coated with a LED UV-curable formulation in a fluid energy mill

Synthesis and Characterization of Pressure Resistant Agent with Double‐Layer Core/Shell Hollow‐Structure for Emulsion Explosive

“…The third step was loading Al 2 (SO 4 ) 3 into the perforated cenospheres via a vacuum impregnation process , as elaborated in Figure , and then stopped the vacuum operation and opened the separatory funnel valve to force the Al 2 (SO 4 ) 3 solution into the hollow space of the cenospheres (as shown in Figure c). The fourth step was sealing Al 2 (SO 4 ) 3 loaded cenospheres with polymethyl methacrylate (PMMA) , and PMMA films were formed on the surfaces of the perforated cenospheres by strong ultraviolet light irradiation of a ultraviolet ray curing machine (1 KW230MM220 V, BLTUV, China), as shown in Figure d. The final step was the formation of double‐layer core/shell hollow‐structure microspheres, where NaHCO 3 powder and cenospheres coated with PMMA were added into deionized water to form aqueous phase and then mixed with hydrophobic nano‐silica using a high‐speed shearing machine (JS30‐230, SUPOR, China), and the double‐layer core/shell hollow‐structure microspheres were obtained after passing a 150‐mesh sieve to remove the uncoated cenospheres and the remained hydrophobic nano‐silica (see Figure e).…”