59results about "Nitrocellulose explosive compositions" patented technology

The invention discloses microporous smokeless firework explosive and a preparation method thereof. The preparation method comprises the following steps of: dissolving scrapped military smokeless explosive containing nitrated cellulose into a solvent to form macromolecular sol, emulsifying and foaming the sol to form paint emulsion, dispersing the paint emulsion into a non-solvent medium under stirring action to form balls, then driving the solvent, separating the materials, and drying the materials to obtain explosive particles with microporous structures on the inner part for emitting and dissecting fireworks. The smokeless firework explosive has high fire transfer rate and adjustable stacking density and particle size because of a large amount of microporous structures on the inner part, the appearance of the microporous smokeless firework explosive is approximately spherical or oblate, the particle size is controllable, the stacking density is 0.05 to 0.4 g/cm<3>, and the aperture of the inner part is 0.01 to 500 microns in variety.

The invention relates to a wood pulp nitrocellulose single-base propellant and a preparation method thereof and belongs to the technical field of propellant preparation. The method for preparing the single-base propellant comprises the following steps: by taking wood pulp nitrocellulose as a main raw material of the single-base propellant, expelling water and plastifying, sequentially companding, cutting, screening, removing solvent, desensitizing the gloss and drying according to the conventional single-base propellant technical technology, and thus obtaining the single-base propellants of various different article numbers of which the internal trajectory performance meets the index requirement, such as 2/1 camphor tree and 4/7 stone. The wood pulp nitrocellulose single-base propellant comprises the following components in percentage by mass: 80-98 percent of wood pulp nitrocellulose, 1-2 percent of stabilizing agent, 1-5 percent of volatile component, 0-6 percent of desensitization agent and 0-7 percent of other supplementary elements. According to the preparation method, the problem that the raw material of the single-base propellant depends on linters nitrocellulose is solved, and the strategic supplies reserves are expanded.

A percussion primer composition including at least one explosive, at least one nano-size non-coated fuel particle having natural surface oxides thereon, at least one oxidizer, optionally at least one sensitizer, optionally at least one buffer, and to methods of preparing the same.

The invention discloses a processing method of single-base powder and double-base powder for fireworks. The processing method comprises the following steps: (1) removing impurities from technical materials, preparing raw materials, namely, a. removing sundries such as metals contained in the single-base powder and the double-base powder, and b. watering for humidifying; (2) processing wet powder, namely, a. putting the materials in a pulverizer, pulverizing the materials to powder with 40-100 meshes, and b. carrying out centrifugal dewatering, namely, dewatering and drying by using a centrifugal machine, wherein the dewatering time is 20-25 minutes, and the water content is 10-15%; (3) screening and grading, namely, a. screening under the condition of wetting, and 40-60 mesh wet powder and 60-80 mesh wet powder, b. screening powder with 80-100 or above meshes by using water, and c. grading and packaging the screened wet powder; (4) processing dry powder, namely, a. carrying out electric heating drying on the wet powder or drying the wet powder in the sun, wherein the drying temperature is 35 to 65 degrees, the time is 20-24 hours, and the water content of the powder is 1-5%, and b. cooling for 2-4 hours at a natural temperature, and mechanically cooling for 1 hour, thus obtaining the single-base powder and the double-base powder for fireworks; and (5) packaging finished products, namely, sealing and packaging by using anti-static and damp-proof fiber woven bags, and putting the finished products in storages. The processing method has the advantages of simple and convenient processing, good safety and the like.

The present invention shows a munitions propellant. The propellant has a nitrocellulose component is about fifty-two percent (52.0%) of the propellant. This is either a nitrocellulose having twelve and six-tenths percent (12.6%) nitrogen, or a combination of a nitrocellulose having twelve and six-tenths percent (12.6%) nitrogen and a nitrocellulose having thirteen and thirty-five one hundredths percent (13.35%) nitrogen, and in which the average nitrogen proportion is thirteen and five one-hundredths percent (13.05%).The propellant also has a nitroester-based plasticizer and a non-nitroester-based plasticizer. The nitroester-based plasticizer comprises about thirty-four percent (34.0%) of the propellant by weight, and comprises diethylene glycol dinitrate (DEGDN). The non-nitroester-based plastizier comprises from about three percent (3.0%) to about four percent (4.0%) by weight and comprises di-normal propyl adipate (DNPA). In addition, about seven percent (7.0%) of the propellant by weight of the composition is nitroguanidine (NQ).

Propellant compositions are provided herein for use in small arms cartridges. Such propellant compositions include from about 70 to about 90% by weight of a cellulose-based organic fuel, from about 5 to about 30% by weight of a non-azide, nitrogen-containing primary organic oxidizer and from about 0.5 to about 10.0% by weight of a secondary nitrate, perchlorate, chlorate of peroxide oxidizer. Preferably, such compositions are in the form of extruded shaped hollow cylindrical grains having a length in the range of 0.030 to 0.200 inch, a diameter in the range 0.040 to 0.070 inch, and having a coaxial opening there through having a wall grain thickness in the range 0.008 to 0.016 inch. Ignition grains are also provided for use alone or in a mixture with the propellant compositions. When used in a small caliber firearm or muzzleloader, the temperature of combustion is at a level that ensures substantially complete combustion of the fuel during firing so that the products of combustion are mostly gaseous.

A method of manufacture of foamed celluloid molded products, involving three steps for the manufacture of higher density (0.7 to 1.25 gm/cc) foamed celluloid products or simple geometry lower density (0.2 to 0.7 gm/cc) foamed celluloid products, and four steps for the manufacture of lower density foamed celluloid products of any geometry. The three step process involving: (1) providing small, uniform, pieces of celluloid; (2) presoaking the pieces in a physical blowing agent (PBA) under pressure; and (3) foaming at raised temperature a controlled quantity of the presoaked pieces in a mold—to obtain the desired shape and density. For a lower density foamed celluloid product, of any moldable geometry, the steps are to: (1) small pieces of celluloid, that (2) have been presoaked in a PBA, are (3) pre-expanded to an intermediate density, and then (4) foam the desired lower density foamed product in a mold at raised temperature.

The invention discloses a method for sensitizing microporous smokeless firework explosive, which comprises the following steps of: dissolving scrapped military smokeless explosive containing nitrated cellulose into a solvent to form macromolecular sol, emulsifying and foaming the sol to form paint emulsion, dispersing the paint emulsion into a non-solvent medium under stirring action to form balls, then driving the solvent to obtain explosive particles suspended in the solution and provided with micropores, separating the explosive particles suspended in the solution and provided with micropores, sensitizing the explosive particles separated from the solution of the suspended explosive particles and provided with micropores, and drying the explosive particles to obtain an explosive particle finished product, wherein the sensitizing mode is to add a sensitizing agent into the explosive particles separated from the solution of the suspended explosive particles in a form of aqueous solution or solid. The sensitizing process improves the fire transfer speed of the explosive particles and improves the ignition performance thereof, and the fire transfer speed of the explosive particles is improved by 10 to 200 percent under a normal pressure condition.

By using generally known chemically, physically, or a combination thereof, means to foam celluloid, a foamed celluloid material is invented with a density of less than about 1.25 gm/cm³, which material is relatively low cost, very fast burning, very low residue, easily moldable, and which material exhibits good mechanical strength, and provides a good water barrier. These characteristics make this foamed celluloid a preferred choice for military artillery propellant charge bags, military mortar and civilian fireworks increment charges, combustible cartridges, flare housings, igniter tubes, as well as, closure disks, combustible enclosures and components thereof, among other applications.

The propulsion system for the acceleration of projectiles is based on nitrocellulose and contains a crystalline energy carrier on a nitramine base and an inert plasticising additive. The nitramine compound contains a structural element of the general chemical structure formula R—N—NO₂, where R is a residual.

The nitramine compound is present in a concentration in the range from 1 to 35% by weight, in particular in the range from 5 to 25% by weight. The nitramine compound is preferably RDX. The inert plasticising additive is a water-insoluble polyoxo compound, if necessary in combination with a substance containing carboxyl groups. In layers near the surface an increased concentration can be present. The inert plasticising additive is present in a concentration of 1 to 5% by weight.

A multispectral smoke obscurant composition effective in reducing transmittance in the visual, infrared, and ultraviolet regions of the electromagnetic spectrum, comprising at least one metal organic framework (“MOF”), at least one fuel, at least one oxidizer, and optionally one or more additives selected from the group consisting of binders, coolants, and accelerants. The MOF or MOF composite is present from about 10 to 90 weight percent of the smoke obscurant composition, while the fuel and the oxidizer in combination comprise about at least 10 weight percent of the smoke obscurant composition.

The present invention relates to a high energy-containing propellant composition and a use thereof. The propellant composition of the present invention is a propellant composition for guns, including: (a) 55 to 85 wt % of a nitrocellulose binder; (b) 10 to 35 wt % of a nitramine oxidant; (c) 1 to 4 wt % of a plasticizer having both a nitrate group and a nitramine group; and (d) 0.5 to 3 wt % of a stabilizer. The propellant composition of the present invention significantly improves a physical compatibility between the nitrocellulose binder and the oxidant using a plasticizer containing both a nitrate group and a nitramine group, leading to stable interior ballistics characteristics from low temperature to high temperature as well as improvement on the characteristics of an extrudate. Accordingly, the propellant composition of the present invention may be effectively applied to an ammunition for guns due to an excellent physical property and interior ballistic stability thereof.

The invention discloses a smokeless firework propellant. The composition comprises the following ingredients in parts by weight: 30-50 parts of one of guanidine nitrate or nitroguanidine, 20-40 parts of diethylene glycol dinitrate, and 20-40 parts of cellulose nitrate. The smokeless firework propellant has the beneficial effects that smoke occurrence quantity and air residue are small in burning,no smoke is generated through visual inspection; the safety performance meets the national standard requirement; the moisture resistance is good, the medicine is stable, the storage performance has no abnormality for a long time (within five years); the economy is good, and the popularization and application are easy: the production cost is low and slightly higher than the military nitrate, and the increase rate can not exceed 10%; and under same conditions, the using amount accounts for 45-55% of military nitrate.