METHODS OF DETERMINING CHEMICAL RESISTANCE OF GUNPOWDER Russian patent published in 2014 - IPC G01N30/46 

FIELD: chemistry.

SUBSTANCE: determination of the chemical resistance is carried out by a content of an effective stabiliser, which represents the sum of DPA and its mononitro- and nitroso-derivatives taking into account their efficiency coefficient, in extracts of gunpowder with acetonitrile by a method of highly efficient liquid chromatography by dissolution of gunpowder in acetonitrile for 1 hour with an intensity of mixing 600±100 min-1. Chromatography is performed in an acetonitrile-water medium with a ratio 70:30, at a rate of the mobile phase consumption 0.5 ml/min at a temperature of 50°C. Determination of guaranteed storage terms for gunpowders is performed by formula: $$K=\frac{C_{init}-C}{C_{init}},$$ where C_init is the concentration of the effective stabiliser in gunpowder before thermostating, C is the concentration of the effective stabiliser in gunpowder after thermostating, C_ef=C_DPA+0.65·C_o-nitroDPA+0.7·C_p-nitroDPA+0.9·C_nitrosoDPA, C_DPA is the DPA content in gunpowder after thermostating, C_o-nitro is the content of o-nitroDPA in gunpowder, C_p-nitroDPA is the content of p-nitroDPA in gunpowder, C_nitrosoDPA is the content of nitrosoDPA in gunpowder. Value K≤0.9 is considered to be the index of the satisfactory chemical resistance.

EFFECT: elaboration of a quantitative method of determining the content of effective SCS.

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