Process for producing metal powder containing water-based pyrotechnic agent, coated metal powder and use therof

摘要

A water-based prodn. of active pyrotechnic materials (I) contg. metal powder (II) comprises coating (II) with not more than 5 wt.% plastic (III) which is insoluble in dil. acid and water and largely impermeable to water and oxygen, making a slurry of the coated powder with water, mixing with the other components of (I) and introducing the slurry into the required mould. Also claimed is metal powder coated with not more than 5 wt.% plastic (III) as above. Pref. (II) is coated by a fluid-bed process, pref. a vacuum fluid-bed process. (II) is Al or Mg powder, and (III) is a (co)polymer based on (meth)acrylic acid and/or (meth)acrylate esters, esp. a methacrylic acid-methyl methacrylate (MA/MMA) copolymer, which is dissolved in a solvent.