Gas generator

Abstract

The invention relates to a gas generator. An ignition medicament composition adopted by the gas generator is prepared from the following components by mass percent: 40%-60% of strontium nitrate, 25%-40% of 5-amino tetrazole5-AT, 1%-20% of potassium nitrate, 1%-20% of mica powder, 0.5%-10% of aluminum oxide, 0.1%-10% of graphite, and 0.1%-10% of boron nitride. The ignition medicament component prevents the tablet from sticking a mold in a tableting process, the tableted tablet can well maintain the original gloss and form, the phenomenon that the ignition medicament is delay in ignition or large in fluctuation at low temperature of -40 DEG C, the impact range of the ignition medicament worked at the temperature of -40 to +90 DEG C is wider, and the ignition is more uniform when the propellant is ignited is more uniform, the consistency is better, and the ignition performance is obviously improved. Furthermore, the propellant composition adopted by the gas generator can well maintain theform before combustion after the tablet is combusted, thereby preventing the combusted tablet from melting and sputtering to damage the airbag, and the combustion speed is improved when the low-temperature ignition performance of the composition is obviously improved.

Description

technical field [0001] The invention relates to a gas generator, in particular to a gas generator for an automobile safety airbag, and belongs to the technical field of automobile safety airbags. Background technique [0002] As we all know, with the development of highways and the improvement of automobile performance, the speed of automobiles is getting faster and faster, which makes the traffic accidents of vehicles more frequent, so the airbag system, which is an important part of automobile passive safety, is particularly important. The airbag consists of a gas generator and an air bag. A very important part of the airbag system is the gas generator, its function is to generate a sufficient volume of gas at a fast enough rate in a short time to supply the airbag. Automobile airbags are one or more inflatable devices installed in the front and rear of the car or inside the seat and the interior of the car to protect the key parts of the driver and passengers from and re...

AI Technical Summary

Problems solved by technology

However, this patent only uses titanate as the only shape-retaining agent, which has no obvious effect on shape retention and cannot play a good role in combustion state retention, especially for the content of basic copper nitrate greater than 40%, and the content of guanidine nitrate greater than 40%. 40% of the gas generating agent can not play a good role in maintaining the combustion form, and the gas generating agent formula is not easy to be ignited

[0015] For example, patent CN100376515C discloses a gas-generating composition, including guanidine nitrate, basic copper nitrate, auxiliary oxidant sodium nitrate, copper oxide and iron oxide, and ignition improver (aluminum sesquioxide, copper chloride, copper chromate, Potassium chromate), the gas-generating composition that adopts ignition modifier to make it easier to ignite, and the ignition delay period is short, but aluminum oxide is generally used for residue agglomeration, and has little effect on ignition improvement; copper chloride is a weak oxidant for ignition The improvement effect is not great; copper chromate and potassium chromate are strong oxidants containing copper, which can improve ignition to a certain extent, but both will increase the residue content. Copper chromate increases the insoluble residue content, and potassium chromate increases The content of dissolved residues, and the substances containing alkali metal potassium will form soluble aerosol particles after burning, which is not conducive to the agglomeration of residues

[0016] Another example is that the patent US5827996A discloses a gas generating agent for an airbag, including fuels using azoles or metal salts thereof, oxidizers, combustion catalysts, combustion control agents and slagging agents, fuels using azoles and metal salts, and slagging agents are solidified Additives for the combustion residues of gas generants, thereby facilitating the removal of residues by the filter in the airbag, but this patent is applicable to the formulation of azoles as fuel, which has a higher combustion temperature than the guanidine nitrate basic copper nitrate type formulation Too much, the shape of the tablet cannot be well maintained even if the slag forming agent is added

[0017] In addition, patent CN101952227B discloses a method for preparing a gas generating agent, adding guanidine nitrate, basic copper nitrate, auxiliary oxidants (such as potassium nitrate, strontium nitrate and sodium nitrate), burning rate regulator (potassium perchlorate), slag promoter agent (silicon dioxide, zinc oxide, ammonium oxide, aluminum oxide), tablet release aid and form retention synergistic aid B (graphite, molybdenum disulfide, tungsten disulfide, boron nitride), the granulation used in this patent The method is spray granulation, which consumes more energy than wet granulation; in addition, the slag accelerator used in this patent mainly comes from metal oxides, such as silicon dioxide, aluminum oxide, zinc oxide, and cerium oxide , metal oxides as slag accelerators can play a certain role in promoting slag agglomeration, but the effect on tablet shape maintenance is not obvious; at the same time, the patent uses tablet release aids such as: graphite, molybdenum disulfide, Tungsten disulfide, boron nitride, these additives only play the role of tableting aids, and cannot cooperate with metal oxides to promote slag agglomeration

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