280 results about "Pyrotechnic composition" patented technology

The invention discloses a preparation method for fluororubber cladding nanometer aluminum powder composite particles. The preparation method comprises the following steps that the silane coupling agent with the mass being 5-15% that of nanometer aluminum powder is used for modifying the nanometer aluminum powder; fluororubber with the mass being 5-20% that of the modified nanometer aluminum powder is selected and used, a solvent-nonsolvent method is used for conveying cladding modifying on the nanometer aluminum powder modified by the coupling agent, nanometer aluminum powder/fluororubber composite particles are prepared, and the composite particles are of a core-shell structure; the cladding layer fluororubber can postpone the normal temperature oxidation of the nanometer aluminum powder, and the high temperature oxidation rate and heat release rate of the nanometer aluminum powder are significantly improved. The preparation method for the fluororubber cladding nanometer aluminum powder composite particles can effectively prevent the oxidation of the nanometer aluminum powder, keep the activity of the nanometer aluminum powder, overcome the influence of non-formula composition or inert composition cladding nanometer aluminum powder on the comprehensive performance of pyrotechnic composition and propellant, and improve the compatibility between the nanometer aluminum powder and pyrotechnic composition, propellant and the like.

A material for a pyrotechnic composition and related pyrotechnic compositions are provided in which the material includes a substituted basic metal nitrate including a reaction product of an acidic organic compound and a basic metal nitrate. A method for enhancing a burn rate of a gas generant composition and a burn rate enhanced gas generant composition including a reaction product of basic metal nitrate and tetrazoles, tetrazole derivatives, and combinations thereof, and a nitrogen-containing co-fuel such as guanidine nitrate are also disclosed. The burn rate enhance gas generant composition may optionally include an additional oxidizer such as basic copper nitrate.

The present invention generally relates to gas generant compositions for inflators of occupant restraint systems, for example. An extrudable pyrotechnic composition includes polyvinylazoles for use within an airbag gas generator. The fuel may be selected from exemplary polyvinylazoles including 5-amino-1-vinyltetrazole, poly(5-vinyltetrazole), poly(2-methyl-5-vinyl) tetrazole, poly(1-vinyl) tetrazole, poly(3-vinyl) 1,2,5 oxadiazole, and poly(3-vinyl) 1,2,4-triazole. An oxidizer is combined with the fuel and preferably contains phase stabilized ammonium nitrate. A novel method of forming the compositions is also presented wherein the various constituents are wetted and/or dissolved, and then cured within the polyvinylazole matrix thereby forming a more intimate combination within the gas generant composition. A vehicle occupant protection system 180, and other gas generating systems, incorporate the compositions of the present invention.

The invention discloses a low-combustion-temperature-carrier-based pyrotechnic composition preparation method. According to the present invention, the oxidizing agent, the combustible agent and the binder in the existing pyrotechnic composition formula are subjected to separate and mixing granulation to form a large number of prefabricated high temperature combustion mass points, the functional additive is dispersed among the high temperature combustion mass points after the functional additive is cladded or embedded by an energetic material, the energetic material cladded functional additive can rapidly transfer fire during combustion, and can rapidly separate from the combustion interface and enter the flame during the intense combustion of the high temperature combustion mass points so as to form the low combustion temperature flame carrier; and with the preparation method, the functional additive can be directly carried to the flame zone, such that the flame temperature can be easily and ideally controlled.

A safe environment-friendly novel pyrotechnic composition is used as a powdery colorful flower-forming spray composition, and comprises the compositions in parts by weight: 20-50 parts of a high-energy oxidizing agent, 30-60 parts of nitrocellulose, 1-15 parts of a colouring agent, 1-15 parts of a combustible effect agent, 1-10 parts of an adhesive, and 1-10 parts of a stabilizing agent. A preparation technology for the novel pyrotechnic composition is simple, the pyrotechnic composition prepared by employing the above formula is relatively low in friction sensitivity and impact sensitivity, far higher in chemical stability and safety than those of other pyrotechnic compositions, slightly smoky and environment-friendly after being combusted, and is widely applicable to various pyrotechnic composition products.

A pyrotechnic display device configured to ignite solid pyrotechnic compositions or aerial shells within a launch tube prior to propelling them on a desired arc. A smokeless pyrotechnic propelling charge is disposed within the launch tube below the solid pyrotechnic compositions, and separated therefrom. An ignition source is disposed in operative relationship to the pyrotechnic compositions or aerial shells, which are ignited prior to ignition of the smokeless pyrotechnic propelling charge.

The invention discloses a nano-composite energetic material. The nano-composite energetic material is prepared through the steps that CL-20 and NC are taken as raw materials and then dissolved in weak-polar solvent according to the mass ratio (0.1-3):1 of the CL-20 to the NC to be prepared into a transparent solution, an isocyanate curing agent and a composite catalyst of T-12 and TEDA are added to form wet gel, the solvent is removed through supercritical drying after the wet gel is aged, and then the aerogel-state nano-composite energetic material is obtained. The prepared composite energetic material has the nano-structure, is higher in energy and activity and lower in sensitivity, has the good prospect on the aspects of improving the security feature and energy releasing efficiency of energetic components and the like and can be applied to the fields of high-energy density materials such as solid propellants, explosives and powders and pyrotechnic compositions.

Methods of making and resultant compositions thereof, which include a gas generant having a coating including an inorganic combustion inhibitor. Such coated gas generants are useful in pyrotechnic compositions and ignition materials, and may be employed, for example, in inflatable restraint systems. The ratio of coated and uncoated gas generant bodies within an airbag inflator may be tailored to provide S-curve inflation performance. Spray application of aqueous mixture including the combustion inhibitor onto the gas generant body provides a rapid way to achieve a thin but robust coating.

This invention is for an improved sparkler which has the feature of being self-igniting. The sparkler comprises a rod 12 having one end which functions as a handle 14. Adjacent to the handle 14 on the rod 12 and extending generally along the remaining length of the rod 12 is a pyrotechnic composition coating 16. Bonded to the pyrotechnic composition coating 16 at a point furthest from the handle 14 is a self-igniting match head tip 18. When the match head tip 18 is struck against a suitable surface, ignition occurs and the sparkler's display begins. This self-ignition feature distinguishes the invention from the sparklers currently available which require heat or flame from an external source to be applied to the sparkler to cause ignition.

The invention discloses a flower-spraying pyrotechnic composition with composite effects. The flower-spraying pyrotechnic composition comprises the following components in weight portion: 30 to 60 portions of potassium perchlorate, 8 to 20 portions of magnalium, 5 to 25 portions of strontium carbonate, 5 to 15 portions of polyvinyl chloride, hexachlorobenzene or chlorinated paraffin, 2 to 15 portions of phenolic resin and 10 to 20 portions of 40 to 60 mesh aluminum dross. A flower-spraying product manufactured according to the formulation of the invention can simultaneously and compositely reveal the effects of slowly burning, landing, flowering and showing red light, and is stable in performance and suitable for industrialized batch production.

The invention relates to a pyrotechnic composition, and especially relates to a sulfur-free firework propellant. The sulfur-free firework propellant is composed of 60-75 parts of potassium perchlorate, 10-20 parts of charcoal, 10-20 parts of potassium biphthalate and 5-10 parts of resin. Compared with the prior art, the sulfur-free firework propellant has the following advantages that 1)while combusting, the combustion products is potassium chloride, carbon dioxide and water, nitrogen, sulfur and harmful forbidden drugs are not contained, atmosphere pollution is greatly reduced, and environmental protection performance is provided; 2)safety performance can satisfy the national standard requirement; 3)moisture resistance is good, the medicament is stable, long-term (in five years) storage performance is normal; and 4) economy is good, and the popularization and application are easy.

Methods for making a pressed monolithic gas generant for an inflatable restraint device (for example, an airbag system for a vehicle) are provided. The methods include admixing a gas generant material with a ballistic performance modifier to form a mixture. The mixture is granulated. Then, a pressed monolithic gas generant grain is formed by applying pressure to the granulated mixture, where the grain has an actual density of at least about 95% of the maximum theoretical density. The pressure may be applied in a controlled manner to both side of the gas generant material in a die cavity, and removing formed grain from die cavity while maintaining some pressure to both sides of the grain, thereby further improving various pyrotechnic properties. The methods of the disclosure provide pyrotechnic compositions that are economical to manufacture, have improved burn rate, combustion profile, effluent quality, strength, durability, and integrity of the grain, while having a consistent shape between different production lots.

The invention provides a pyrotechnic agent of thermal pipe cutter and its producing technique. It is basically composed of thermite and gas-forming agent in weight percents of 70%-90% and 5%-30%, respectively. The thermite is composed of Al and Fe2O3, and the gas-forming agent is mixture of potassium permanganate and activated carbon, teflon or nitrocotton. The thermite reacts and produces high temperature and the gas-forming agent is decomposed into gas stage product all with this, thus forming the inner pressure for spraying fused metal flow. Its producing technique: firstly mix the thermite and gas-forming agent uniformly; then putting the mixture in a mould for compression molding to make a columnar body with a hole in the center, namely the outer layer of the pyrotechnic agent; finally, placing the mixture of thermite and gas-forming agent in the central hole, which is the inner layer, and making the inner-layer density less than the outer-layer density. Its advantages: use safety and transporting convenience.

The invention relates to a high pressure gas impact-loading safety performance test method for an energetic material in the field of technical detection of explosives and powders, a pyrotechnic composition and a solid-liquid propellant. The method comprises the following test steps: sample preparation, condition selection, detection implementation and data processing. During sample preparation, dosage of liquid and powder samples is 100 mg, and a solid sample is made into a tablet of phi 10 mm*3 mm. Selected equipment includes a high pressure gas generator, a high pressure gas release device and a gas pressure detector. According to the high pressure gas generator, a low-temperature gas generant is adopted for fast combustion so as to provide high pressure gas for the test. The maximum pressure deviation of gas generated by the testing device is +/- 0.25 Mpa. During detection implementation, gas pressure value of a tested sample with 50% explosive probability or the minimum explosive gas pressure value of the tested sample is measured. During data processing, critical explosive gas pressure value is calculated according to the mathematical statistics method. The invention has advantages of simple method, reliable data and good test reproducibility.

The invention discloses a measurement method for the content of magnesium and the content of aluminium in a main component of pyrotechnic composition for fireworks and crackers. The measurement method comprises the following steps: (1) taking inductively-coupled plasma emission spectrometer as a detecting instrument, selecting 279.0nm as a characteristic spectral line for detecting Mg element, and selecting 256.7nm or 237.3nm as a characteristic spectral line for detecting Al element; respectively making a Mg-element calibration curve and a Al-element calibration curve; and (2) preparing pyrotechnic composition sample liquid, detecting on a computer, displaying the characteristic spectral intensity on a recording instrument, reading a mass concentration value corresponding to Mg or Al according to the determined calibration curve by the characteristic spectral intensity; and calculating the mass percent concentration of elementary magnesium or aluminium according to the specific formula. The measurement method disclosed by the invention has the advantages that method is simple and the detection period is short; and the characteristic spectral line is adopted for detection by combination with the sample treatment method, the recovery rate is high (99.85%-103.07%) and the precision is high,.