451results about "Pressure gas generation" patented technology

The invention discloses a two-dimensional metal oxide composite reduced graphene oxide burning rate catalyst, which is prepared by the following steps: uniformly grinding glucose, ammonium nitrate and transition metal nitrate, calcining at high temperature to generate a two-dimensional metal oxide nanosheet, mixing the two-dimensional metal oxide nanosheet with surfactant modified reduced graphene oxide powder, and sintering at high temperature to obtain the two-dimensional metal oxide composite reduced graphene oxide burning rate catalyst. And transferring into a high-pressure hydrothermal kettle for solvothermal reaction, so that the reduced graphene oxide and the two-dimensional metal oxide nanosheet are compounded to form the composite burning rate catalyst with a 2D-2D structure. Two two-dimensional materials are compounded through a solvothermal method, the defects of accumulation of reduced graphene oxide and aggregation of the two-dimensional metal oxide due to high surface energy are effectively avoided, meanwhile, the high conductivity of the reduced graphene oxide is utilized, the synergistic catalysis effect of the metal oxide and the carbon material is enhanced, and the performance of the composite material is improved. The composite material has a good catalytic effect on the thermal decomposition process of ammonium perchlorate.

The invention provides an Al-RE rare earth alloy powder fuel forming an oxygen diffusion channel at a grain boundary, which is characterized in that a rare earth intermediate alloy Al-RE is added into a pure Al melt, alloying is carried out, and a solidification structure capable of diffusing oxygen atoms is formed after supersonic atomization of an inert gas atomization system, non-equilibrium cooling and staged treatment. In the high-temperature oxidation environment, the rare earth alloy powder fuel is oxidized, meanwhile, the grain boundary also starts to be oxidized, oxygen is diffused from the surface of the powder to the interior, an oxygen diffusion channel and a microstructure are formed through grain boundary oxidation, and complete oxidation combustion is achieved. The micron-sized powder fuel with the oxygen diffusion channel formed at the crystal boundary in the alloy powder fuel is low in production cost and easy to store, and has the advantages of reaction characteristics of nano-particle powder and high combustion efficiency. And due to the existence of an oxygen diffusion channel in the powder, internal crystal grains can be oxidized to a great extent, and almost no unburned residue exists, so that the combustion efficiency and the economic benefit of the fuel are improved, and the propelling capacity of the fuel is also greatly improved.

The invention discloses an ammonia borane solid propellant. The propellant takes octahydrotriboride as a fuel, ammonium perchlorate and the like as an oxidant, aluminum powder as a metal fuel and starch as an adhesive. The metal fuel and the adhesive which are good in compatibility are selected to form a propellant system, and the stability of the system is guaranteed while it is guaranteed that the system has the sufficient combustion effect.

A gas generator includes a housing main body made of metal, a holder assembly, and an igniter. The holder assembly includes a holder portion made of metal and a connector portion made of resin. The holder portion includes a first barrel portion and an annular projection. The connector portion includes a second barrel portion and a cylindrical portion. The cylindrical portion is inserted in the housing main body and externally attached to the first barrel portion. As a portion of the housing main body corresponding to the cylindrical portion is decreased in diameter, the cylindrical portion is compressed by being sandwiched between the portion of the housing main body decreased in diameter and the first barrel portion so as to seal a gap between the housing main body and the first barrel portion.

The invention relates to the technical field of energetic materials, in particular to a laser response type high-entropy alloy-based initiating explosive material and a preparation method thereof. The initiating explosive material is mainly formed by uniformly loading a heat-sensitive high-energy compound (such as lead stilbeneate or hexa (4-amino-3, 5-dinitropyrazole) copper) on high-entropy alloy nanoparticles containing five or more metal elements, wherein the heat-sensitive high-energy compound is such as lead stilbeneate or hexa (4-amino-3, 5-dinitropyrazole) copper. The preparation method comprises the following steps: mixing acetylacetone metal salt, a surfactant and a reducing agent in an organic solvent, and stirring and reacting at 180-220 DEG C to prepare high-entropy alloy nanoparticles; the nano particles and a high-energy compound are co-dispersed in a mixed solvent containing a dispersing agent, ultrasonic treatment is carried out to form suspension liquid, and freeze drying is carried out to obtain the nano particles. The method is characterized in that the excellent photo-thermal conversion performance of the high-entropy alloy is utilized, under low laser energy irradiation, a high-energy compound can be effectively excited, and stable detonation of secondary charge CL-20 is successfully achieved. According to the invention, the problems of high response threshold and low output energy of the existing laser initiating explosive material are solved.

The invention provides a novel underwater explosive formula and a preparation method. The novel underwater explosive formula comprises the following components in percentage by mass: 25%-30% of a high-energy explosive matrix, 10%-15% of an underwater stabilizer, 15%-20% of a water-soluble carrier material, 10%-12% of a waterproof coating and 30%-33% of a synergistic material. According to the novel underwater explosive formula and the preparation method, various high-performance materials and an environment-friendly stabilizer are adopted, and the underwater activity and efficiency of the explosive are improved through an innovative preparation process.

Emulsion explosives with gas bubbles that are resistant to in-borehole migration or coalescence are disclosed herein. Such emulsions can be sensitized by mechanically-introducing gas bubbles into the emulsion. Resistance to gas bubble migration and coalescence can be achieved by homogenization, without the need for bubble stabilization agents.

The invention provides a preparation method of modified nano silicon powder wrapped by a polymer, which comprises the following steps: dissolving a polymer PVDF (Polyvinylidene Fluoride) in an organic solvent N-dimethylformamide DMF (Dimethyl Formamide), carrying out ultrasonic treatment, adding Si powder, adding the Si powder in three times, and then carrying out magnetic stirring, so that nano metal powder and a polymer solution are fully mixed; the preparation method comprises the following steps: adding an energetic oxidant AP into a polymer solution containing nano Si powder according to a mass ratio of PVDF / AP of 1: 3, magnetically stirring, and carrying out ultrasonic treatment to obtain a precursor solution PVDF / AP / Si; and relevant parameters are set, and the coated and modified shell-core type nano composite metal powder is prepared through a spray granulation method. According to the invention, the yield of the silicon-based compound can be improved, the energy and combustion performance of the compound are improved, and the cost of coating silicon powder is effectively reduced. In addition, the PVDF, the AP and the silicon powder are wrapped according to the optimal proportion, so that the energy release efficiency of the compound Si-coated PVDF / AP reaches the maximum.

The present invention relates to a composite boron powder and a preparation method thereof. The composite boron powder is prepared by a secondary condensation method using a vinylidene fluoride / propylene alcohol copolymer as a compounding agent, a polyethylene glycol monobutyl ether acrylate / acrylonitrile / allylamine / hydroxyethyl acrylate copolymer as an auxiliary compounding agent, an epoxy resin as a high-strength composite adhesive, and diethylenetriamine as a curing agent. The amounts of the components are based on the mass of the boron powder: the mass of the vinylidene fluoride / propylene alcohol copolymer is 1-2% of the mass of the boron powder, the mass of the polyethylene glycol monobutyl ether acrylate / acrylonitrile / allylamine / hydroxyethyl acrylate copolymer is 0.3-1% of the mass of the boron powder, the mass of the epoxy resin is 2-3% of the mass of the boron powder, and the mass of the diethylenetriamine is 0.15-0.4% of the mass of the boron powder.

The invention provides a temperature-sensitive gas production composition and application thereof in improving the safety performance of a lithium ion battery. When the temperature of the temperature-sensitive gas production composition is lower than 90 DEG C, the temperature-sensitive gas production composition is stable and does not produce any gas; when the temperature-sensitive gas production composition is heated to 100 DEG C or above (such as 100-140 DEG C), the temperature-sensitive gas production composition can produce gas with the volume being 100 times or above of the volume of the temperature-sensitive gas production composition; when the temperature-sensitive gas production structural member is used for the lithium ion battery, the temperature-sensitive gas production structural member is independently packaged and is not in direct contact with an electrolyte in a battery cell, so that the cycle performance of the battery is not influenced; when the thermal runaway temperature of the battery is increased, a large amount of inert gas can be quickly released in the battery cell, the generated pressure enables the pressure release valve to be opened, the safety valve or the aluminum-plastic package to be broken through, flammable organic solvent steam is discharged, heat is taken away, the risks of fire catching and explosion are reduced, and therefore the safety performance of the lithium ion battery is improved.

The invention provides a composite oil phase material for improving water resistance and explosion performance of a porous granular ammonium nitrate fuel oil explosive. The composite oil phase material comprises the following raw materials in parts by mass: 80-100 parts of naphthenic oil, 2-7 parts of an amino-containing dispersant, 1-5 parts of a nanoscale molecular sieve and 0.3-3 parts of an oleate derivative stabilizer. The composite oil phase material can effectively improve the explosion performance and the water resistance of the on-site mixed porous granular ammonium nitrate fuel oil explosive. The raw materials are environment-friendly and easy to obtain, and high popularization value is achieved. The composite oil-phase material provided by the invention is high in flash point and low in condensation point, can replace diesel oil with the grade of minus 40 DEG C to minus 20 DEG C to be applied to preparation of a porous granular ammonium nitrate fuel oil explosive mixed and loaded on site in winter, the intrinsic safety of the explosive production process is improved, and the explosive preparation cost is reduced. The composite oil phase material provided by the invention can also provide good weak alkaline water resistance for the porous granular ammonium nitrate fuel oil explosive.

The invention discloses a gas generating agent and a safety airbag. The gas generating agent comprises a combustible agent, an oxidizing agent and a framework composition; the backbone composition includes a combination of carbides, and metal nitrates and / or metal oxides. The gas generating agent is prepared by combining the substances, and a large amount of gas is emitted by utilizing rapid combustion of the combustible agent and the oxidizing agent, so that the interior of the air bag is rapidly inflated; the framework composition in the gas generating agent can quickly form a smoke and fire framework in an integral block shape after combustion, on one hand, the smoke and fire framework has an integral block-shaped structure, so that the weight of a filter screen can be reduced, or the filter screen is not used, and on the other hand, the smoke and fire framework can also adsorb smaller combustion residues, so that the gas discharged into the air bag is cleaner.

The invention belongs to the technical field of energetic materials and preparation, and particularly relates to a boron-aluminum alloy with a spherical composite layer structure and a preparation method of the boron-aluminum alloy. The boron-aluminum alloy is of a core-shell structure with aluminum as a shell layer to wrap a boron-aluminum alloy phase, the boron-aluminum alloy is prepared from, by weight, 35-60% of aluminum powder and 40-65% of boron powder, the D50 of the aluminum powder is 0.9-1 micron or 10-50 microns, and the D50 of the boron powder is smaller than or equal to 4 microns. The invention further discloses a preparation method of the boron-aluminum alloy. By the adoption of the method, the boron-aluminum alloy powder of various sizes and high chemical combination can be prepared, the powder sphericity degree is high, the fluidity is good, the chemical combination proportion is high, the particle size is controllable, and no impurity is introduced in the preparation process. During combustion, aluminum on the surface layer is combusted firstly, combustion of the boron-aluminum alloy powder inside can be driven, the ignition temperature is reduced, and the combustion efficiency is improved.

The invention discloses an MXene (at) PDA / Cu NPs composite material and a preparation method of the MXene (at) PDA / Cu NPs composite material. The method comprises the following steps: placing an MAX material in an HCl solution of LiF, stirring, etching and stripping to obtain few-layer MXene; then, a few layers of MXene are dispersed in a Tris-HCl buffer solution, dopamine hydrochloride is added, and MXene (at) PDA is obtained through a self-polymerization reaction; and finally, adding copper nitrate, sodium hydroxide and an ascorbic acid solution into the aqueous dispersion of the MXene (at) PDA, and carrying out reduction reaction to obtain the MXene (at) PDA / Cu NPs composite material. A low-temperature in-situ reduction method is adopted, the preparation process is simple, conditions are mild, a large number of organic chemical reagents are not needed, the thermal decomposition temperature of ammonium perchlorate is reduced by 108.4 DEG C through the prepared MXene (at) PDA / Cu NPs composite material, and the MXene (at) PDA / Cu NPs composite material has an excellent catalytic effect on ammonium perchlorate.

The invention discloses a low-pressure-index thermoplastic elastomer propellant and a preparation method thereof, and the low-pressure-index thermoplastic elastomer propellant provided by the invention comprises the following components in percentage by mass: 10-15% of a thermoplastic adhesive system; 15-18% of a metal fuel; 65-70% of an oxidant; 0.5-3% of a combustion performance regulator; the thermoplastic adhesive system at least comprises two kinds of thermoplastic elastomers with different melting points. According to the propellant prepared by adopting the adhesive system, the combustion rate pressure index propelled by the thermoplastic elastomer can be remarkably reduced, the combustion efficiency of the propellant is improved, the combustion rate adjusting range of the propellant is widened, and the mechanical property and the processing property of the thermoplastic elastomer propellant can be improved at the same time.

The invention discloses passivated aluminum-lithium alloy powder and a green and environment-friendly passivation method thereof, and the passivated aluminum-lithium alloy powder sequentially comprises an aluminum-lithium alloy core and a passivation coating film from inside to outside; specifically, a passivation solution with the main components of Cr (NO3). 9H2O, Cr (OH) SO4, Na2MoO4. 2H2O, H2ZrF6, NaH2PO4. 2H2O, NH4HF2 and the like is used, and the passivation film is formed on the surface of aluminum lithium alloy powder through simple soaking, filtering and drying. The environment-friendly passivation method is used for treating the surface of the aluminum-lithium alloy, so that a uniform and compact passivation film is formed, the influence of external water vapor and oxygen on the aluminum-lithium alloy is effectively prevented and isolated, and the stability of the aluminum-lithium alloy in storage and use is maintained.

The present invention discloses a copper-containing hydrogen-bond organic framework material, a preparation method, and an application thereof. The method comprises the following steps: mixing trimesic acid, melamine, and a copper salt and dispersing them in a solvent to obtain a mixed suspension; transferring the mixed suspension to a reactor for reaction to obtain a copper-containing hydrogen-bond organic framework material solution; cooling the copper-containing hydrogen-bond organic framework material solution, centrifuging it, and then post-treating the copper-containing hydrogen-bond organic framework material solid obtained by centrifugation to obtain a copper-containing hydrogen-bond organic framework material with a one-dimensional rod-shaped structure. When used in the thermal decomposition catalysis of ammonium perchlorate, the copper-containing hydrogen-bond organic framework material prepared by the present invention can exhibit high catalytic activity and stability, thereby concentrating the exothermic temperature range and heat release of ammonium perchlorate.

The application discloses an energetic material, a preparation method thereof and application of the energetic material as explosives and self-ignition propellants. I C 12 H 12 N 10 or M Ⅱ C8H6N8; wherein, M I is selected from Co, Ni and Cu; M Ⅱ is selected from Zn. The energetic material is convenient to synthesize, has good thermal stability, excellent mechanical sensitivity, excellent propelling performance and specific impulse, has a significant energy density advantage, can effectively solve the problem of continuous evaporation of hydrazine propellants during storage, avoid the risk of internal pressure increase of a fuel tank, and overcome the problems of liquid fuel in the storage and transportation process. Therefore, the innovative high-performance energetic material has excellent performance and wide application potential, and has great commercial value in the fields of aviation, aerospace and military.

The invention belongs to the technical field of solid propellants, and particularly relates to a propellant containing active metal fuel and a preparation method of the propellant. 3.0-4.0% of a plasticizer; 0.3-0.4% of a curing agent; 0.1%-2.0% of a combustion rate regulator; 0.01%-0.5% of a bonding agent; 15-19% of an active metal fuel; 10-18% of a nitramine explosive; the metal fuel is an aluminum-gallium metal alloy, and the aluminum-gallium metal alloy is an aluminum-gallium metal alloy of which the outer layer is coated with an aluminum film. The propellant provided by the invention has the advantage of high combustion efficiency, and can meet the requirement of a solid rocket engine on the high energy performance of the propellant.

The present invention relates to an energetic perfluoroborate binder, a preparation method thereof and an application thereof, belonging to the technical field of energetic binders. The structural formula of the binder is:; wherein, n is a positive integer less than or equal to 20. The main raw materials of the binder are 1H,1H,2H,3H,3H-perfluorononane-1,2-diol, boric acid and polyazidoglycidyl ether; boric acid forms a borate bond with 1H,1H,2H,3H,3H-perfluorononane-1,2-diol, and polyazidoglycidyl ether is compounded through the boron-nitrogen coordination action with 1H,1H,2H,3H,3H-perfluorononane-1,2-diol, realizing the controllable preparation of the energetic perfluoroborate binder. The energetic perfluoroborate binder has high energy and stable storage, and can improve the energy and mechanical properties of the propellant.

The invention relates to the field of preparation of modified double-base propellants, in particular to a preparation process of a modified double-base propellant absorbing drug with uniformly dispersed solid components. The preparation process comprises the following steps: putting the dispersing agent into an absorption kettle according to a feeding sequence, then putting a particle suspension prepared from the white material, the RDX, the aluminum powder and the catalyst into the absorption kettle, and heating, stirring and absorbing in a water medium to obtain absorption slurry. On the basis of a traditional double-base propellant stirring absorption process, a dispersing agent is added to help absorption, the sedimentation problem of a catalyst and RDX in a propellant formula is effectively solved through the effects of electrostatic repulsion and steric hindrance, and an absorption drug with uniformly dispersed solid components is obtained.

The invention relates to the technical field of solid propellants, and particularly discloses a neutral polymer bonding agent, a preparation method of the neutral polymer bonding agent and application of the neutral polymer bonding agent in the solid propellants. The neutral polymer bonding agent can realize controllable molecular weight and controllable proportion of functional groups in the polymer, and the active group-CN steric hindrance in the neutral polymer bonding agent is small, so that the neutral polymer bonding agent is more easily adsorbed on the surfaces of ammonium nitrate particles, thereby improving the bonding effect.

The invention discloses application of ferrocenyl conjugated microporous polymers Fc-CMPs in a composite solid propellant and the composite solid propellant, the ferrocenyl conjugated microporous polymers Fc-CMPs are porous organic polymers which take ferrocenyl groups as conjugated functional units and are connected through covalent acetylenic bonds, and the ferrocenyl conjugated microporous polymers Fc-CMPs have excellent thermal stability and permanent porosity, and can be used for preparing the composite solid propellant. The material is solid powder, is insoluble in a traditional organic solvent and does not migrate, and a ferrocene unit serves as a constituent part of a polymer framework and an oxidation-reduction active site and is dispersed in a two-dimensional conjugated network structure of a composite solid propellant. When being used as a burning rate catalyst to be applied to AP decomposition, the ferrocene burning rate catalyst can obviously reduce the high-temperature decomposition peak temperature of AP, and solves the migration problem of a traditional ferrocene burning rate catalyst in a composite solid propellant system. The Fc-CMPs are applied to an AP decomposition catalysis scene for the first time, and a new direction is provided for development of a composite solid propellant burning rate catalyst.

This invention relates to the field of solid propellant technology, specifically disclosing a neutral polymer bonding agent, its preparation method, and its application in solid propellants. The neutral polymer bonding agent is prepared by polymerization of poly(hydroxyalkyl polyacrylate) and cyanoacetic acid as raw materials. It can achieve controllable molecular weight and controllable proportion of functional groups in the polymer. Moreover, the active group -CN in the neutral polymer bonding agent has low steric hindrance and is more easily adsorbed on the surface of ammonium nitrate particles, thereby improving the bonding effect.

The present invention discloses a neutral polymer bonding agent and a method for preparing the same. The bonding agent has a structure as shown in Formula I or Formula II. Furthermore, when the neutral polymer bonding agent has a structure as shown in Formula I, the resulting solid propellant exhibits significantly improved elongation at break. The neutral polymer bonding agent provided herein can be used in an ATPET-GAP curing system, significantly improving the mechanical properties of the solid propellant. #imgabs0#

The invention provides a lead salt modified 5-aminotetrazolyl gas generating agent with low combustion temperature and high combustion rate and a preparation method thereof, the gas generating agent comprises 5-aminotetrazole, strontium nitrate and lead salt, and the mass ratio of the lead salt is 5-10%. According to the invention, the 5-aminotetrazolyl gas generating agent is modified, so that the temperature of the gas generating agent can be reduced, the burning speed can be improved, and the applicability of the gas generating agent as a solid propelling type fire extinguishing device is enhanced.

The invention discloses an Al / polypeptide / AP biological composite energetic material and a preparation method thereof. The biological composite energetic material is of a core-shell structure with Al / polypeptide as a core and AP as a shell. The particle size of the biological composite energetic material is 5-300 [mu] m; the content of the aluminum powder is 20-45% by mass, the polypeptide is 0-5% by mass, the AP is 50-75% by mass, and the content of the polypeptide is not 0%. The invention further provides a preparation method of the Al / polypeptide / AP biological composite energetic material, a cooling recrystallization method is adopted, the self-assembly characteristic of polypeptide molecules is combined, directional arrangement of Al, polypeptide and AP on the nanoscale is achieved, and a uniformly-mixed composite material is formed. The material is stable in structure, the Al powder is not easy to agglomerate, hydroxyl, carboxyl and nitro functional groups in the polypeptide respectively form strong interaction with the Al powder and AP, and the mechanical property, the thermal stability and the reaction activity of the material are remarkably improved. In addition, the preparation process is simple and convenient, the negative influence on the environment is reduced due to the biodegradability of the polypeptide, and the method is suitable for large-scale industrial production.

Provided is a gas-generating agent composition containing components (a) to (c) below, wherein a combustion temperature calculated based on a composition containing the components (a) to (c) below is 1680 K or higher: (a) guanidine nitrate, (b) basic copper nitrate, and (c) melamine cyanurate.

The invention discloses an electrolytic preheating-electrolytic ignition method for a three-electrode hydroxylamine nitrate liquid propellant, and belongs to the field of liquid rocket engines and electrochemistry. Three electrolysis electrodes are arranged in the electrolysis chamber and comprise two positive electrodes and one negative electrode, so that two groups of electrolysis electrode pairs are formed. The method comprises the following steps: injecting a nitric acid hydroxylamine-based liquid propellant into an electrolysis chamber, and electrifying a group of electrolysis electrodes to start electrolysis preheating; after the preset switching time is up, closing the current working electrolysis electrode pair, and switching to another group of non-working electrolysis electrodes to continue electrolysis; and low-voltage and rapid electrolytic ignition is realized. According to the three-electrode electrolysis structure, the time for ignition and reaction to reach the highest temperature can be shortened, and the system response speed is increased; the preheating and ignition voltage can be changed, and the large voltage adjusting and optimizing space is achieved; meanwhile, the electrolytic ignition current is relatively stable, and the instantaneous power consumption is small; and electrolysis power consumption can be saved, electrolysis electrode loss is reduced, and reuse of the electrode is facilitated.

To provide a gas generating agent composition that ignites at a relatively low-temperature phase in which a gas generator does not rupture.SOLUTION: A gas generating agent composition comprises a fuel component and an oxidizing agent component. The gas generating agent composition further comprises, as the fuel component, a compound having a lactone structure and having a melting point or a decomposition point of 90°C or higher but lower than 250°C.SELECTED DRAWING: None