US 4,051,207 AGranted

Process for the production of propellant charge powders, especially nitroguanidine powders

AssigneeDynamit Nobel Aktiengesellschaft

InventorsHeinrich Brachert, Joachim Kleiss

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Abstract

A process for producing propellant charge powders from solvent-containing mixtures such as nitroguanidine powders containing nitrocellulose and/ or nitrocellulose and diglycol dinitrate or nitroglycerin and nitroguanidine and additives wherein an alcohol-containing mixture or optionally a water-containing mixture of said propellant charge powders is premixed with additional components of the propellant powder, the mixture is first dried, if necessary, and the solvent is incorporated therein and the solvent-containing premix is homogenized and preplasticized in a kneading device or the water-containing premix is homogenized and preplasticized in the kneading device and then the resultant mixture is dewatered by drying and then combined with a solvent; then the solvent-containing mixture is plasticized in an extruder and converted thereby into granular form and the resulting granular material is extruded into a final product form in a screw-type extruder. Subsequently, the solvent is evaporated therefrom.

Claims14

Dependent claims

A process for the production of propellant charge powders from solvent-containing mixtures containing nitrocellulose, and components selected from the group consisting of diglycol dinitrate, nitroglycerin, nitroguanidine, penthrite, and hexogen and mixtures thereof, and further additives, which comprises premixing an alcohol-containing or a water-containing raw mixture containing nitrocellulose with additional required components of the propellant powder;

then either incorporating a solvent in the alcohol-containing mixture and homogenizing and preplasticizing the solvent-containing premix of the components in a continuously operating kneading device or homogenizing and preplasticizing the water-containing premix of the components in the continuously operating kneading device, then only thereafter dewatering the mixture by drying and combining the mixture with a solvent;
then plasticizing the solvent-containing preplasticized mixture in a continuously operating screw-type extruder;
converting the resultant mixture into granular form;
extruding the granulated material finally into a final powder form in a continuously operating screw-type extruder;
and evaporating the solvent therefrom.

2 more elements

Dependencies are inferred from the claim text.