39 results about "Polymer-bonded explosive" patented technology

A poured-type azido high-polymer bonded explosive and a preparation method of same. For solving a problem of low energy of an HTPB-based PBX explosive, an azido polyether energetic binder is added to a formula system of the PBX explosive, and by means of addition of an alkynol compound as a curing additive agent, a curing reaction time of the azido polyether binder system is greatly reduced. By means of addition of a high-energy-density main explosive and a metal fuel component, the obtained poured-type azido PBX explosive has high explosion heat and explosion volume, is higher than 1.80 g/cm<3> in density and is more than 1.60 TNT in power. Meanwhile, the poured-type azido PBX explosive has a low sensitivity level, is higher than 49 J in drop hammer impact energy I50 and is not more than 40% in friction sensitivity.

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 relates to a production method for compression molding of PBX (Polymer Bonded Explosive) by using ultrasonic pressing. The production method comprises the following steps: a, feeding powder PBX (10) into a PBX forming device, starting a pressurizing device on the PBX forming device to enable the PBX (10) to be positioned in a pressed state; when a pressure value applied to the PBX (10) exceeds a set pressure value, starting ultrasonic transducers and ultrasonic generators; using ultrasonic waves generated by the ultrasonic transducers to act on a PBX powder body (10) to generate vibration; gradually increasing the pressure value applied to the PBX (10) until the PBX (10) is completely compressed. The production method disclosed by the invention has the technical effects that the density, the strength and the uniformity of the PBX obtained by compression molding are improved, the quality of a finished product of the PBX is effectively improved, and the energy effect of the PBX is improved.

The invention discloses a method for characterizing a multi-phase interface of polymer bonded explosive. The method comprises the following steps: preparing a series of PBX samples composed of explosive crystals and additives, performing a small angle neutron scattering experiment on the prepared samples, performing absolute strength correction on small angle neutron scattering experimental data,fitting the experimental data based on a Porod theorem, and solving linear system of equations, thereby obtaining interfacial areas between the explosive crystals and adhesives, between the adhesivesand holes and between the explosive crystals and the holes. The method is capable of directly providing numerical values of the interfacial areas among the explosive crystals, the adhesives and the holes in the PBX explosive, and is an effective method for characterizing a complex multi-phase interface inside a multi-component PBX material. The method provides the numerical values of various areas, and is an important foundation of deeply understanding a structure-function relationship of the PBX explosive, optimizing the preparation process and realizing performance improvement study.

The invention discloses a polymer bonded explosive for a missile of a common jet hole. The polymer bonded explosive is prepared from the following components by weight percent: 95-98.5% of cyclonite, 1.2-4.0% of ethylene-ethylene vinyl-acetate copolymer and 0.3-1.0% of graphite. The ethylene-ethylene vinyl-acetate copolymer is adopted as a binder; the heat resistance of the ethylene-ethylene vinyl-acetate copolymer is more excellent than that of the cyclonite; the surface is lower than the cyclonite; the ethylene-ethylene vinyl-acetate copolymer has a certain sensitivity reduction effect, ensures good interface interaction and strong binding power of the binder and the cyclonite, enhances the grain strength, and can reduce the dosage of the binder, so as to meet the requirements of powder charge of the common jet hole. The prepared polymer bonded explosive is high in energy (the detonation velocity achieves 8526m/s), low in mechanical sensitivity, and good in heat resistance (non-burning and non-bursting at 150 DEG C for 24 hours), and can meet the requirements of the common jet hole.

The invention discloses an optical fiber acoustic emission system for monitoring a damage and destruction process of an explosive and a monitoring method thereof. A fiber Bragg grating is adopted as an acoustic emission sensor to replace traditional piezoelectric resonant acoustic emission sensors, and a tunable narrowband laser and a photodetector are used as a photoelectric conversion device. The optical fiber acoustic emission system is used for monitoring fracture and destruction of the polymer bonded explosive in the optical fiber acoustic emission monitoring method. Monitoring and analysis are carried out by taking a three-point bending fracture and destruction test of an explosive specimen as an example. The optical fiber acoustic emission system has a microsecond response speed andcan accurately monitor the time history of internal energy release amount in the explosive damage and destruction process and provide a data support for mastering a damage and destruction law of theexplosive.

The invention discloses a bionic vertex face heat conduction enhancement filler which is prepared from the following raw materials based on the total weight which is 100 percent: 60 to 85 percent of asheet-like heat conduction filler, 8 to 19 percent of bionic polydopamine and 5 to 25 percent of high-heat-conduction metal nano particles. The invention further provides a preparation method of thebionic vertex face heat conduction enhancement filler. The invention further discloses application of the bionic vertex face heat conduction enhancement filler in a PBX (polymer bonded explosive). Thebionic vertex face heat conduction enhancement filler can fulfill the aim of further enhancing the heat conduction performance of the filler, and is high in heat conduction performance. When the PBXis filled with the high-heat-conduction enhancement filler, the heat conduction performance of the PBX can be substantially improved at a low content, and thermal stress inside a PBX component in faceof a complicated environment is effectively reduced; the method is simple, efficient, green and environmentally friendly. The bionic vertex face heat conduction enhancement filler is suitable for large batch production, and has an important application prospect.

The invention discloses a method for detecting the thermal stability of polymer-bonded explosive. The method is characterized in that the thermal stability of micro-structures of the polymer-bonded explosive can be detected. The method includes steps of preparing platy PBX (polymer-bonded explosive) samples from the formed PBX; carrying out in-situ variable-temperature neutron or X-photon small-angle scattering experiments in appropriate q ranges to acquire temperature-dependent variation curves of scattered neutron or X-photon counting rates; analyzing temperature-dependent relative and absolute variation of the scattered neutron or X-photon counting rates to judge the thermal stability characteristics of the micro-structures of the PBX. The method has the advantages that the influence offew relative integral micro-structures in the PBX on the thermal stability can be detected by the aid of the method, and the method is an effective method for detecting the thermal stability of micro-structures of complicated multi-component PBX materials; temperature-dependent variation, which is given by the aid of the method, of the scattered neutron or X-photon counting rates is an importantfoundation for intensive research on 'structure-function' relationships between the thermal stability and different types of macroscopic performance of the microscopic structures of 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 tri-functionality NIMMO-THF (3-nitatomcthyl-3-methyl oxetane-tetrahydrofuran) copolymer ether energetic binder and a synthetic method thereof. The structural formula of the tri-functionality NIMMO-THF (3-nitatomcthyl-3-methyl oxetane-tetrahydrofuran) copolymer ether energetic binder is as shown in figure (I) in the specification. The synthetic method comprises the following steps that trimethylolpropane (TMP) serves as an initiator, 3-nitatomcthyl-3-methyl oxetane (NIMMO) and tetrahydrofuran (THF) serves as a monomer, and cationic ring opening polymerization reactionis carried out so as to obtain the tri-functionality NIMMO-THF (3-nitatomcthyl-3-methyl oxetane-tetrahydrofuran) copolymer ether energetic binder. The binder can be directly cured by adopting dual-functionality isocyanate, and a cross-linking agent does not need to be added. The binder is mainly used for a composite solid propellant and a polymer-bonded explosive. The structural formula of the tri-functionality NIMMO-THF (3-nitatomcthyl-3-methyl oxetane-tetrahydrofuran) copolymer ether energetic binder is as shown in figure (I) in the specification, wherein m is equal to 5-20, n is equal to 5-20 and is an integer.

The invention belongs to the technical field of casting explosives and solid propellants. In order to overcome the problems of the existing HTPB (hydroxyl-terminated polybutadiene) type PBX ((polymer bonded explosive)) casting explosive, including high curing forming temperature, long room temperature curing time, easy sedimentation of solid ingredients and the like, the invention provides a room temperature curing polyurethane bonding agent system for PBX casting explosives. The room temperature curing polyurethane bonding agent system for the PBX casting explosives is prepared from polyalcohol, plasticizing agents, polyisocyanates and curing catalysts according to a certain proportion. Good processing performance is realized; the viscosity is low in an early curing period; the viscosity increase is slow; bubbles can be favorably removed in a construction process; the system is suitable for charging process construction processes of PBX casting explosives in different dimensions; the system viscosity increase is obviously accelerated in a later curing period; the solid phase sedimentation problem of the PBX casting explosives in a curing and forming process can be inhibited to a certain degree; on the basis of meeting each construction index, the temperature requirements in the curing process are obviously reduced; the curing and forming under room temperature conditions can be achieved; the effects in aspects of improving the safety in the PBX casting explosive production process, the casting explosive column quality and the energy saving effect are obvious.

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.

A method of manufacturing a press polymer-bonded explosive, in which a polymer emulsion is used to maximize the efficiency of a process, and a press polymer-bonded explosive manufactured using the same. The method includes a polymer-emulsion-manufacturing step of mixing a monomer of a polymer binder and an emulsifier with a process water and then adding an initiator to thus manufacture a polymer emulsion using a polymerization reaction, a slurry-manufacturing step of mixing a raw material including an explosive and an emulsion breaker with fresh process water to thus manufacture a slurry, an agglomerated-particle-forming step of adding the manufactured polymer emulsion to the manufactured slurry to thus form agglomerated particles in which a surface of the raw material is coated with the polymer binder, and an agglomerated-particle-obtaining step of collecting the agglomerated particles using filtration and drying the collected agglomerated particles.

The invention discloses a low-cost high-safety polymer-bonded explosive (PBX), and relates to the technical field of energetic materials. The PBX comprises the following raw materials in parts by weight: 40 parts of a main explosive, 6-10 parts of an insensitive explosive, 46.5-50.5 parts of high-energy metal, 2.5 parts of a binder, 0.5 part of a first insensitive agent and 0.5 part of a second insensitive agent. The high-safety PBX based on DNAN has good safety performance and mechanical strength, and meanwhile the sensitivity to initiation is low.