Gas generating agent composition as well as preparation method and application thereof

Abstract

The invention relates to a gas generating agent composition, a preparation method and a gas generator containing the gas generating agent composition. The gas generating agent composition comprises the following components in percentage by mass: 40-60% of guanidine nitrate, 25%-60% of basic copper nitrate, 1%-20% of strontium nitrate, 1%-10% of ammonium perchlorate, 1%-10% of a slag-forming agent,and 0.6%-10% of a release agent / lubricant. The gas generating agent composition uses a slag-forming agent as a form-retaining agent. A tablet can well keep the form after combustion and is preventedfrom melting and splashing to burn an air bag after combustion, strontium nitrate and ammonium perchlorate are adopted as auxiliary oxidants, the use amount of basic cupric nitrate is reduced, moltencopper residues are reduced, and the gas generating agent composition is mainly used for an automobile safety airbag gas generator.

Description

technical field [0001] The invention relates to a gas generating agent composition, a preparation method and an application thereof, and belongs to the technical field of automobile airbag gas generators. Background technique [0002] Automobile airbag gas generating agent is loaded into the gas generator as a gas-generating agent, and is triggered when needed to generate a large amount of gas. The airbag consists of a gas generator and an air bag. Generally, when the collision exceeds the preset intensity, the gas generator is activated and triggered, and starts to burn the gas generating agent inside to generate gas, inflate the air bag, and form a cushioning air cushion between the interior and the human body to protect the human body from injury. [0003] The gas generating agent in the early stage is mainly the gas generating agent formula of sodium azide type. This formula has many advantages such as stable combustion, low combustion temperature, easy ignition, low in...

AI Technical Summary

Problems solved by technology

However, this patent uses titanate as a form-retaining agent, which does not have a significant effect on form-retaining, and cannot play a good role in maintaining the form of combustion, especially for basic copper nitrate content greater than 40%, and guanidine nitrate content greater than 40%. 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

[0007] 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

[0008] 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

[0009] 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, and the energy consumption of spray granulation is higher than that of 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 , as a slag accelerator, metal oxides can promote the agglomeration of slag to a certain extent, but the effect on maintaining the shape of the tablet is not obvious

[0010] The previous application with the application number CN107698415A disclosed a gas generating agent composed of guanidine nitrate, basic copper nitrate, strontium nitrate, ammonium perchlorate, strontium titanate, and talcum powder. Although the addition of strontium titanate in this application has a slag-forming effect , but in the formula with BCN / GN as the system, its slagging effect is not significant. In practical application, it is found that its slagging effect cannot meet the needs, and a large number of tests show that the density of the tablet is poor after burning. Fragile, it will easily cause flying out of the generator filter and fall into the air bag, which may ablate the air bag and bring potential danger to the human body

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