GB543298A - Explosives - Google Patents

Abstract

543,298. Explosives. WILLIAMS, W. P. (Western Cartridge Co.). July 11, 1940, No. 11578. [Class 9 (ii)] Propellant powder grains are produced by the autogenous adhesion of fine particles of gelatinized nitrocellulose dust which is effected by agitating and heating the particles in a water slurry to which is added, as by spraying, a solvent or plasticizer not miscible with the water. Volatile solvent is subsequently removed by evaporation ; but, non-volatile, explosive plasticizers such as nitroglycerine, dinitrotoluene, or trinitrotoluene may be used, in which case the grains are submitted to a centrifugal or wring- ing treatment. The degree of agglomeration as well as the dimensions and physical characteristics of the grains may be controlled by the extent of agitation and emulsification. Before final drying, the grains may be given a coating, comprising, e.g. nitrocellulose, to modify the burning characteristic, and to render the powder non-hydroscopic. A deterrent such as dibutylphthalate may be embodied in the coating. Partially deteriorated cannon powder may be submitted to the process by first reducing to the required dust form and then treating in a slurry with a solvent such as ethyl acetate and suitable deterrents. A neutralizer, such as calcium carbonate, may also be added. Specification 5865/93, [Class 9], is referred to.