39 results about "Polymer-bonded explosive" patented technology

The invention discloses a method for determination of the polychlorotrifluoroethylene (PCTFE) content in a polymer-bonded explosive (PBX) by near infrared spectroscopy. The method includes the steps of: preparing and collecting 260 PBX samples, taking 180 samples of them as a calibration set for establishing a calibration model, taking the remaining 80 samples as a validation set for model validation, and acquiring the near infrared spectrum data of all the samples; using a standard method to determine the PCTFE content in the samples; subjecting the spectrum data of the validation set samples in the wave bands of 6102.0cm<-1>-5697.0cm<-1> and 4680.2cm<-1>-4242.9cm<-1> to a first order derivative treatment, correlating the treated spectrum data with the PCTFE content by a partial least squares method, and establishing the calibration model by cross validation; employing the calibration model to predetermine the PCTFE content of the validation set samples, and selecting an optimal model according to a minimum root mean squared error of prediction (RMSEP) of the validation set; and acquiring the near infrared spectrum data of the samples to be determined, and making use of the optimal model to obtain the PCTFE content directly. Being suitable for determination of the PCTFE content in a PBX explosive, the method has the characteristics of convenient operation, and rapid and accurate analysis.

The invention discloses a method for characterizing interface structures in plastic bonded explosive on the basis of gas permeation processes. The method includes steps of A, testing gas permeability coefficients of bonders and gas permeability coefficients of at least one piece of PBX (polymer bonded explosive) with explosive contents unequal to zero by the aid of gas molecules under certain pressure and temperature conditions; B, fitting the gas permeability coefficients of the bonders and the gas permeability coefficients of the PBX by the aid of improved HIM (hierarchical hashing index models) and acquiring the thicknesses of interface cavities in the PBX by means of computing. The gas molecules are used as probes. The gas permeability coefficients of the bonders and the gas permeability coefficients of the PBX are obtained at the step A by means of testing. The method has the advantages that technologies for characterizing the interface structures in the PBX are simple and feasible, the interface structures in the PBX can be quantitatively characterized in nanometer scales, important effects can be realized for research on evolution rules of the interface structures in the PBX under temperature and stress loading conditions, and an effective way can be provided for investigating influence rules of different bonding agents on the interface structures in the PBX.

The invention discloses an oil penetration-preventing polymer-bonded explosive containing paraffin microcapsules and a preparation method of the explosive. The explosive is prepared from, by mass, 30-90 parts of an explosive, 0-45 parts of metal, 0-35 parts of ammonium perchlorate, 8-20 parts of a bonding agent, 0-5 parts of paraffin, 0.1-5 parts of the paraffin microcapsules and 0-1 part of a curing agent. The method comprises the following steps that batching is conducted; the materials are put in a kneader to be mixed; the mixed materials are poured into a mold, and the mold is put in an oven for curing the materials. According to the oil penetration-preventing PBX explosive containing the paraffin microcapsules, the oil penetration performance is reduced by 60%-70%, the mechanical properties such as the tensile and compressive strength, the strain rate and the elasticity modulus are all improved, and the shock wave sensitivity is reduced.

The invention discloses a high polymer bonded explosive whose mechanical properties are enhanced by nanoparticles and a preparation method thereof. The high polymer bonded explosive whose mechanical properties are enhanced by nanoparticles contains a mass fraction of The nano-explosive particle is 50-600nm. The preparation method is to mix the ordinary-sized explosive and the nano-explosive particle in water in proportion, and then slowly add the binder solution, and the explosive particle is gradually compounded under the action of the binder as the solvent volatilizes. Granular, washed and dried explosive products are then pressed. The invention adopts the nano-explosive particles to replace the ordinary granular explosive in the high polymer bonded explosive, without changing the composition and content of the PBX formula, and can significantly enhance the mechanical properties of the high polymer bonded explosive. It can effectively avoid the use of a large number of multi-component binder systems in order to improve the mechanical properties, ensure the high energy density of the high polymer bonded explosive, and at the same time make the high polymer bonded explosive have a single component, the preparation method is simple, and the cost is low.

The invention relates to the field of explosives, and particularly discloses a polymer bonded explosive for an ultra-high-temperature petroleum perforation bullet and a preparation method for the polymer bonded explosive. The explosive consists of hexanitrostilbene, a vinyl acetate-methyl acrylate-butyl acrylate terpolymer and graphite. The explosive has the characteristics of high heat-resistant elemental hexanitrostilbene content, easiness in detonation, high explosive pressing performance, higher pressing density and energy and high inter-component compatibility. The explosive consists of 96.8 to 98.2 mass percent of hexanitrostilbene, 1.5 to 2.5 mass percent of the vinyl acetate-methyl acrylate-butyl acrylate terpolymer and 0.3 to 0.7 mass percent of graphite. According to the explosive and the preparation method, combustion and explosion of the ultra-high-temperature petroleum perforation bullet under the conditions of 220 DEG C and 100 h or 250 DEG C and 4 h are avoided, and the explosive and the preparation method can be used for the exploitation of a deep well oilfield and an offshore oil-gas field.

The invention discloses a high-viscosity PBX (Polymer Bonded Explosive) injection-compression molding method and device. The device is provided with an explosive charging barrel and an installing barrel, wherein an extrusion piston is arranged in the installing barrel and is connected to an air cylinder, the air cylinder can be used for controlling the extrusion piston to move up and down and stop, so that explosive slurry in the explosive charging barrel is pressed and injected into a mold to realize the explosive charging; the air cylinder is provided with two speed control valves so as to control the speed of the extrusion piston, and the device is aslo provided with a silencer, circulating water, a sealing ring and the like, so that the injection-compression molding device is further improved. The injection-compression molding device is used in the injection-compression molding method, so that the high-viscosity PBX charging is safely and efficiently realized. The injection-compression molding method and device can be used for solving the problem of poor rheological property of the high-viscosity PBX technology, can effectively ensure the controllability of internal quality of products when the explosive is charged in a complex structure in a large quantity, so as to obtain the explosive pouring parts with high filling quality; moreover, the charging process is rapid, safe, low in working noise, and simple and convenient to operate.

The invention discloses a trifunctional end-alkenyl copolyether energetic binder and a synthesis method thereof. A structural formula of the trifunctional end-alkenyl copolyether energetic binder is shown as Figure (I), and a synthesis process thereof comprises the following steps: using trifunctional NIMMO-THF copolyether as a raw material, adding allyl isocyanate, and carrying out addition reaction to obtain the trifunctional end-alkenyl copolyether energetic binder. The synthesis method facilitates large-scale preparation, and double bonds endow the binder with the capability of curing at room temperature. The trifunctional end-alkenyl copolyether energetic binder and the synthesis method thereof disclosed by the invention are mainly used for composite solid propellants and polymer bonded explosives, (formula shown in the specification), where m=5-20, n=5-20, and m and n are integers.

The invention relates to a high-mechanical performance low-resistance high-polymer bonded explosive and a preparation method thereof, belonging to the technical field of composite energetic materials. The explosive of the present invention is prepared from a certain ratio of polymer bonding material polyurea, energetic material and explosive performance improving agent. The explosive of the present invention introduces a new type of binder, two-component slow-response polyurea, to effectively compound high-energy explosives, thereby significantly improving the mechanical properties of the energetic compound, and at the same time solving the problem of low adhesion of the existing high-energy composite explosives. High acoustic impedance problem. The high-polymer bonded explosive with high mechanical properties of the present invention improves the bonding strength between the explosive components and between the explosive and the surrounding materials, and plays an important role in improving the mechanical properties of the energetic compound and the improvement of the comprehensive performance of the charge. Value. In addition, the explosive of the present invention is prepared at normal temperature without generating waste water, waste liquid and waste gas, and has the advantages of safety and environmental protection, simple process and the like.