10 results about "Ammonium dinitramide" patented technology

The invention relates to the technical field of solid propellants, in particular to an integrated coating material based on moisture absorption prevention and synergistic energy release as well as a preparation method and application of the integrated coating material. The ternary core-shell structure sequentially comprises an ammonium dinitramide core, an energy-containing covalent organic framework middle layer and a polytetrafluoroethylene nano-film outer layer from inside to outside, and the energy-containing covalent organic framework middle layer is combined with the surface of the ammonium dinitramide core through hydrogen bonds or p-pi conjugation; and the polytetrafluoroethylene nano-film outer layer coats the outer side of the energetic covalent organic framework middle layer in a continuous nano-scale film form. The problems that in the prior art, ADN is high in hygroscopicity and energy-containing characteristics are reduced due to a traditional coating technology are solved, long-term moisture absorption prevention of ADN is achieved, the long-term stability is improved, and meanwhile the combustion performance of ADN is improved.

The application provides a kind of ammonium dinitramide-based liquid propellant combustion simulation data labeling method and system based on digital twinning, by collating and refining the combustion physical law of ammonium dinitramide-based liquid propellant in different combustion environments and multi-batch historical labeling data, a labeling correlation map is constructed, the newly generated combustion simulation data by the digital twinning system through iteration simulation is compared with the labeling correlation map, the coverable combustion state description items are extracted and the corresponding labeling labels are reused, the new combustion state description items not matched to the labeling correlation map are separated synchronously, the newly added labeling labels are labeled pertinently, the combustion state description item-labeling label correlation corresponding record of the labeling correlation map is updated, the adaptability of all combustion simulation historical labeling data generated in the early stage is calibrated, the original labeling label content is updated, and the combustion simulation data labeling benchmark library of the digital twinning system is updated synchronously. The application can improve the fit of simulation and labeling.

The invention discloses a modified ammonium dinitramide crystal and a preparation method thereof, the method comprises the following steps: step 1, adding a formula amount of melamine powder into ammonium dinitramide powder, and uniformly stirring to obtain mixed powder; step 2, adding the mixed powder into a granulation kettle filled with a dispersion medium, heating to the melting temperature of ammonium dinitramide, and stirring until the mixed powder is molten and dispersed in the dispersion medium; and step 3, stirring at a set stirring speed, and carrying out cooling crystallization to obtain the modified ammonium dinitramide crystal. According to the method, melamine is added into ammonium dinitramide (ADN), the crystallization temperature of ADN is remarkably increased, the supercooling degree of ADN is inhibited, DSC tests show that the crystallization temperature of ADN is increased to 40 DEG C from 20.7 DEG C, the supercooling degree is effectively inhibited, and the stability of ADN crystallization is greatly improved.

This invention discloses a core-shell structured moisture-resistant ammonium dinitramide composite material, its preparation method, and its applications. The composite material uses ammonium dinitramide (ADN) as the core and methyl methacrylate-butyl acrylate copolymer (PMMA-BA) as the shell. A solvent-non-solvent method is used to precipitate and coat the PMMA-BA copolymer onto the ADN surface, resulting in the ADN@PMMA-BA core-shell structured composite material. This invention effectively shields the polar ionic sites on the ADN surface by constructing a dense hydrophobic polymer shell, significantly reducing its adsorption and permeation of water molecules. While maintaining the original thermal stability and energy performance of ADN, this material exhibits reduced moisture absorption and increased water contact angle, demonstrating excellent moisture-resistant properties. It is suitable for applications in humidity-sensitive explosives, propellants, and blasting agents, effectively extending the storage stability and safety of ADN-containing materials.

The application discloses a normal-temperature ultrasonic preparation method of spherical ammonium dinitramide, which comprises the following steps: adding ammonium dinitramide particles and an additive into an organic solvent, stirring for 10-30 minutes at a temperature of 20-35 DEG C to obtain an ammonium dinitramide solution; placing the ammonium dinitramide solution into an ultrasonic instrument, and ultrasonically treating for 5-15 minutes at a set ultrasonic power and frequency; and adding the ammonium dinitramide solution into dichloromethane at a certain dropping temperature under stirring, and obtaining the spherical ammonium dinitramide after filtration and drying; wherein the mass ratio of the ammonium dinitramide, the organic solvent, the additive and the dichloromethane is 1:10-22 mL:0.01-0.02 g:80-100 mL. The method of the application uses normal-temperature ultrasonic crystallization instead of melting granulation, and has the advantages of convenient operation, low cost, normal-pressure operation and large-scale production. The melting temperature of the ammonium dinitramide provided by the application is higher than that of raw material ADN, the particle size of the spherical ADN is between 10 mu m and 500 mu m, the melting temperature is 89.2-92.30 DEG C, the sphericity is greater than or equal to 0.8, the impact sensitivity is 15.2 J-20.0 J, and the friction sensitivity is 74%-81%.

The invention provides a dinitramide ammonium-based liquid propellant combustion simulation data labeling method and system based on digital twinning, and the method comprises the steps: constructing a labeling correlation map through combing and refining combustion physical rules and multi-batch historical labeling data of a dinitramide ammonium-based liquid propellant in different combustion environments; the method comprises the following steps: comparing new combustion simulation data generated by a digital twin system through iterative simulation with an annotation association map, extracting a covering combustion state description item and multiplexing a corresponding annotation label, synchronously separating a new combustion state description item which is not matched with the annotation association map, performing targeted annotation to obtain a newly added annotation label, and performing annotation on the newly added annotation label to obtain a new combustion state description item; and updating a combustion state description item-labeling label association corresponding record of the labeling association map, performing adaptive calibration on all combustion simulation historical labeling data generated in an early stage, updating original labeling label contents, and synchronously updating a combustion simulation data labeling reference library of the digital twin system. According to the method, the integrating degree of simulation and labeling can be improved.

The invention provides a dinitramide ammonium-based high-energy ion eutectic and a preparation method thereof, the eutectic is named as ADN / OHD eutectic and is composed of dinitramide ammonium and oxalyl dihydrazine, dinitramide ammonium molecules and oxalyl dihydrazine molecules are combined through intermolecular hydrogen bonds, and the dinitramide ammonium-based high-energy ion eutectic belongs to a monoclinic system and a P21 / c space group. Two strategies can be adopted for preparation: the first strategy is as follows: ammonium dinitramide and oxalyl dihydrazine are mixed in water, and the mixture is left to stand or stirred until eutectic crystals are separated out; and the second method comprises the following steps: mixing ammonium dinitramide and oxalyl dihydrazine, dropwise adding the solvent, and mechanically grinding until the solid becomes uniform white powder and the solvent is completely volatilized to obtain the ADN / OHD eutectic crystal. The critical relative humidity of the dinitramide ammonium-based high-energy ion eutectic prepared by the preparation method disclosed by the invention is as high as 70%; meanwhile, the eutectic crystal also has the characteristics of high specific impulse and high energy, the oxygen balance of the eutectic crystal based on CO is high (4.37%), and the theoretical specific impulse of the eutectic crystal is up to 251.28 N * S / kg through NASA software calculation. And the preparation method is simple, green and environment-friendly.

The application discloses application of graphene oxide in reducing sensitivity of ammonium dinitramide, and the graphene oxide is used as raw material, and through reasonable process treatment, impact sensitivity and friction sensitivity of ADN are reduced, thermal stability of ADN is improved, and thermal decomposition performance is improved. Further, the prepared graphene oxide / ADN composite solid has a block structure, edges and corners are relatively smooth, and particles are small and uniform, the composite can reduce impact sensitivity and friction sensitivity of ADN, and can improve thermal performance of ADN and improve mass loss.

The invention discloses a green and clean ADN-based electric control gel propellant and a preparation method thereof, and belongs to the field of special liquid propellants. The electrically controlled gel propellant comprises: 65%-75% of an ADN solution; 10%-15% of ammonium nitrate; 10%-20% of fuel; 5%-10% of a gelling agent; and 0.2%-2% of a functional additive. According to the ADN-based electrogel propellant, ammonium dinitramide serves as a main oxidizing agent, and the propellant has the electrical excitation trigger ignition characteristic and has the advantages of being continuously adjustable in thrust and clean in combustion product. Through optimization of formula design and process innovation, the problems of high pollution, high toxicity, limited ignition technology, high maintenance difficulty and the like of a traditional propellant are solved, and the propellant can be applied to the technical field of space micro-propulsion of a spaceflight micro-propulsion system and the like.

This invention provides an NH-SiGO / ADN / GAP-ETPE composite, its preparation method, and its application. The composite is prepared by solvent evaporation using amino-silicon functionalized graphene oxide, ammonium dinitramide, and poly(azide glycidyl ether) energetic thermoplastic elastomer. The average molecular weight of the poly(azide glycidyl ether) energetic thermoplastic elastomer is 20,000 to 30,000. The mass ratio of amino-silicon functionalized graphene oxide, ammonium dinitramide, and poly(azide glycidyl ether) energetic thermoplastic elastomer is 1:(3-7):(90-190). The NH-SiGO / ADN / GAP-ETPE composite prepared by this invention can improve the heat of explosion and heat of combustion of the original GAP-ETPE by 173.5 J / g to 589.0 J / g and the heat of combustion by 757.9 J / g to 1255.4 J / g. It can also reduce the impact sensitivity of GAP-ETPE from 9 J to 68 J to 100 J.