110 results about "Friction sensitivity" patented technology

The invention discloses metal fiber toughened and enhanced TNT (trinitrotoluene)-based melt-cast explosive and a preparation method thereof. The melt-cast explosive comprises components in parts by weight as follows: 30-40 parts of TNT, 60-70 parts of hexogen or octogen, 0-3 parts of metal fiber and 0-2 parts of paraffin. The preparation method comprises the steps as follows: a surfactant solution is used for treating the metal fiber; materials are compounded; the materials are placed in an explosive melting machine for mixing; and casting is performed under atmospheric pressure. The TNT-based melt-cast explosive has the mechanical properties as follows: the compressive strength is larger than or equal to 24 MPa, the compressive strain is larger than or equal to 0.33%, the compressive modulus of elasticity is larger than or equal to 9 GPa, lower mechanical sensitivity is provided, the friction sensitivity is 0%-10%, and the impact sensitivity is 20%-40%.

The invention relates to a fine-particle high-energy low-sensitivity explosive compound and a preparation method thereof. The method comprises the following steps: mixing an explosive with a macromolecular bonder according to a weight part ratio of 100 to (2-5), and stirring at 40-60 DEG C for dissolving in an organic solvent to obtain an explosive compound solution with 5%-30% by weight of explosives; putting the explosive compound solution into an ejection tank, pumping air into the ejection tank to increase the pressure in the ejection tank to be 0.3-0.7MPa, ejecting the explosive compound solution into an explosive antisolvent with the temperature of -10 DEG C to 10 DEG C, performing centrifugal separation on a solid product, washing, and drying to obtain the explosive compound. According to the explosive compound, explosive particles are micron-sized, the CL-20 surface is densely wrapped with the macromolecular bonder in the form of an interwoven mesh shape, the impact sensitivity of the wrapped CL-20 is reduced to be 24%-40% from 100%, and the friction sensitivity is reduced to be 66%-92% from 100%.

The invention relates to an explosive performance testing device, in particular to an explosive friction sensitivity tester, which solves the problems of the prior art such as low automation degree, low test accuracy, difficulty in ensuring test condition and complex operation. The explosive friction sensitivity tester comprises a box body, a belt clip support fixed on the inner wall on one side in the box body, a friction belt chip inserted on the belt clip support, an impact cylinder fixed on the upper wall of the box body above the friction belt clip, a sample support base with a rotation hole and fixed on one side of the belt chip support, a support base inserted in the rotation hole on the sample support base for accommodating explosive, an explosive support tube inserted in the hole of the support base, and a top bar penetrating through the explosive support tube, wherein one end of the top bar corresponds to the friction belt clip and the other end of the top bar is butted against with a pre-tightening cylinder fixed on the sidewall of the box body. The invention has the characteristics of preciseness, feasibility, applicability, convenience, safety, etc. The invention can test the safety and the reliability of explosives, and has wide application range.

The invention discloses safe and sulfur-free firework bursting powder and propelling powder and a preparing method thereof, and relates to the technical field of fireworks. The firework bursting powder is prepared from, by weight, 15-35 parts of carbon powder, 5-60 parts of potassium perchlorate and 15-70 parts of potassium nitrate. The firework propelling powder is prepared from, by weight,15-35parts of carbon powder, 5-60 parts of potassium perchlorate, 15-70 parts of potassium nitrate, 5-10 parts of adhesive and a proper amount of solvent. The firework bursting powder and propelling powderdo not contain sulfur, metal, benzene or the like, have no toxicity, reduce the air pollution, generate less smoke, have zero percussion sensitivity and friction sensitivity, guarantee safety and environmental protection, have a low moisture absorption rate and stable performance, reduce the ignition point properly, have flammability, high safety performance and propelling performance, do not easily cause barrel blasting, and reduce the production cost; the preparing method of the sulfur-free firework bursting powder and propelling powder is simple and safe.

The invention relates to a method for coating a CL-20 (hexanitrohexaazaisowurtzitane) explosive with plasticized Estane5703. The method comprises the following steps: coating the surface of CL-20 with a desensitizer microcrystalline wax to prepare a CL-20 and microcrystalline wax compound, and coating the surface of the CL-20 and microcrystalline wax compound with Estane5703 to prepare a CL-20 explosive compound. The method allows a uniform and compact film to be formed on the surface of the CL-20 explosive, so the mechanical sensitivity of the CL-20 explosive is substantially reduced. The CL-20 explosive compound prepared in the invention and the coating film thereof are controlled to be in a nanometer range, account for 2-4% of the total system, and have small influences on the energy of the CL-20 explosive. The bump sensitivity of the coated CL-20 explosive is reduced to 52-72% from 100%, and the friction sensitivity of the coated CL-20 explosive is reduced to 40-80% from 100%.

The invention relates to a calcium sulfate composite oxidant for fireworks and crackers and a preparation method thereof, belonging to the technical field of chemical raw materials of the industry of the fireworks and crackers. The oxidant takes calcium sulfate and iron oxide as a main body assisted by barium nitrate, takes potassium permanganate and potassium perchlorate as initiators, and is added a small amount of an active agent. The preparation method comprises the following steps: roasting gypsum (calcium sulfate dihydrate), smashing, adding a mixed powder body of potassium permanganate and potassium perchlorate, grinding, smashing iron oxide, adding the active agent into the iron oxide powder, and then adding barium nitrate and grinding; and uniformly mixing the two types of ground powder. One of main raw materials of the invention is calcium sulfate which is non-toxic and has low price, and after being roasted the calcium sulfate, the calcium sulfate is not only an oxidant but also a moisture-proof agent and a leavening agent and also is a mechanical sensitivity buffer which is fine and smooth and slippery. Since the composite oxidant of the invention is prepared into the fireworks and crackers according to the traditional method, the fireworks and crackers has the advantages that the burning property is good, the safety is strong, the friction sensitivity and impact sensitivity are zero, and the production cost is greatly reduced.

The invention provides a safety airbag igniting powder composition, aiming at overcoming the disadvantage that a sealing foil or a powder cup needs to be designed when grain-shaped igniting powder is used, the problem that the safety performance of boron-potassium nitrate igniting powder is poor, and a low-temperature igniting problem. The safety airbag igniting powder composition is prepared from the following components according to the content: 10 percent to 20 percent of boron powder, 80 percent to 90 percent of potassium nitrate and 0 to 2 percent of a process auxiliary agent; the components are pressed and molded through a rotary tablet press so as to prepare cylindrical powder sheets. The safety airbag igniting powder composition is mainly appalied to an igniting device of a safety airbag gas generator and has the main characteristics that igniting powder has relatively good safety performance and mechanical sensitivity including friction sensitivity and impact sensitivity is relatively small; the safety airbag igniting powder composition is not exploded basically under the stimulation of friction and impact effects. Meanwhile, the igniting powder can still be normally ignited at a low temperature of -40 DEG C+/-2 DEG C, and a phenomenon of double peaks of an indoor pressure curve of the gas generator, namely secondary explosion, under a low-temperature condition does not occur; the igniting powder has the advantages of rapid ignition and slow starting pressure.

The invention relates to a potassium chlorate-free and sulfur-free fragrant environmental- protection safety powder of firecrackers and its components are compounded of potassium perchlorate, Al powder, perlite powder and sandalwood powder. It has simple formula, a few components, good chemical stability and safety, no potassium chlorate and no sulfur, eliminates the defects of strong impact and friction sensitivity, high danger, etc, and has the advantages of low mechanical sensitivity and high safety, excellent bang rate of setting off firecrackers and sound level value.

The invention discloses a sulfur-free environment-friendly gun propellant which comprises the following components in parts by weight: 65 parts of potassium acid phthalate, 15 parts of hemp stem carbon powder, 10 parts of an epoxy resin, 2 parts of graphite powder and 5 parts of lime. The gun propellant manufactured according to the formula is applied to display shells, potted flowers, colored bead barrels, display shell rocket propulsion powder and the like. The sulfur-free environment-friendly gun propellant is excellent in safety performance indexes, the friction sensitivity and percussion sensitivity degree are zero, and the potential safety hazards are eliminated; according to the formula, the sulfur component is completely eliminated, so that pollution of sulfur dioxide and sulfides on the environment is eliminated during firework display; and moreover, the gun propellant does not contain forbidden materials; and the environmental protective performance is greatly improved.

The invention relates to an automatic friction sensitivity instrument. An oil supplier is arranged in a hydraulic tank and connected with a hydraulic cylinder which abuts against the bottom of a hydraulic jacking device; a bracket base is positioned above the hydraulic jacking device, a test sample friction device is arranged on the bracket base; an ejector rod and a sensor are arranged between the test sample friction device and the hydraulic jacking device; a transmission platform is positioned above the bracket base, an electric magnet is arranged on the transmission platform and attracts a pull rod; the pull rod is connected with a driving wheel and a drive motor and pulls the driving wheel and the drive motor to move on a motor guide holder; the drive motor drives the driving wheel and drives a driven wheel by a driving belt; the driven wheel is connected with a swing rod by a driven shaft; a heavy punch is arranged on the swing rod; a firing pin is positioned between the heavy punch and the test sample friction device so as to enable the heavy punch to strike the firing pin and the test sample friction device sequentially; and a photoelectric encoder is arranged on the driven shaft and rotates along with the driven shaft. The friction sensitivity instrument has the advantages of having high automation degree and accurate test performance, being time-saving and effort-saving, and the like.

The invention provides sulfur-free propellant. The sulfur-free propellant is prepared from 35wt%-52 wt% of potassium perchlorate, 5 wt%-15 wt% of a filling agent, 8 wt%-20 wt% of a bonding agent, 5 wt%-18 wt% of calcium stearate and 10 wt%-30 wt% of potassium acid phthalate by taking the total weight of the sulfur-free propellant as a standard. The sulfur-free propellant is low in friction sensitivity, impact sensitivity and moisture absorption capacity and high in thrust, and meanwhile pollution to the environment is reduced.

An ignition powder composition for igniter of which friction sensitivity can be lowered with the required firing current sensitivity being achieved is provided as ignition powder for an igniter that is activated by an electrical signal. The ignition powder composition for igniter contains metal hydride (A); metal powder (B) that is one or more selected from the group consisting of tungsten powder, molybdenum powder, aluminum powder, titanium powder, and magnesium powder; and perchlorate (C).

The invention discloses a safe and environment-friendly launched medicinal composition. The safe and environment-friendly launched medicinal composition comprises the following raw materials in partsby weight: 78-88 parts of wood pulp nitrocellulose, 5-10 parts of azidonitramine, 1-3 parts of a first desensitizing agent, 2-5 parts of a second desensitizing agent, 1-3 parts of a stabilizing agent,0.5-1.5 parts of an adhesive and 3-7 parts of a solvent. The launched medicinal composition provided by the invention has the friction sensitivity and impact sensitivity of 0, the moisture absorptionrate being lower than 1%, does not contain sulfur in components, has the thrust being 5-7 times that of the conventional black powder, is small in environment pollution and high in safety performance, has relatively good safety, stability, heat resistance, cold resistance and other properties, can meet using requirements, and has a relatively good market application prospect.

The invention provides a composite oxidant for fireworks. The composite oxidant consists of the following raw materials in percentage by weight: 20 to 55 percent of potassium perchlorate, 40 to 65 percent of barium nitrate, 1 to 10 percent of monobase powder and 2 to 8 percent of ferric oxide. The composite oxidant for the fireworks has safe performance and low price; the moisture absorption rate is less than 1 percent; the friction sensitivity and the impact sensitivity are zero; and the fireworks produced by the oxidant have the explosion rate and the paper breaking rate of over 98 percent and have safety, stability and long storage time.