Gas-generating agent granules for air bags and pressing preparation method thereof

Abstract

The invention provides gas-generating agent granules for air bags and a preparation method thereof and belongs to the technical field of gas-generating agents. The gas-generating agent granules are characterized in that a gas-generating agent is round-platform-shaped granules; penetrating through holes are arranged in the centers of the bottom surfaces of the granules, so that the bottom surfacesof the granules form concentric circles with the outer diameters being 3.5-10mm and the inner diameters being 1.0-3mm. When the gas-generating agent provided by the invention is burnt, the air bag isslowly inflated at the initial stage of expansion, and is rapidly inflated at the later stage of expansion, so that the pressure-time curve of a gas generator is S-shaped; a pressing process is adopted for pressing and forming, the production efficiency is high, the side pressing strength is more than 120N, the breaking and dust generation are difficult under the severe environment of vibrating use, the reduced weight is less, and the property is stable after long-term use. The gas-generating agent provided by the invention has the beneficial effects that the pressure on a generator shell in burning also can be reduced, so that the shell with lower strength can be used and the weight of the generator can be reduced.

Description

technical field [0001] The invention belongs to the technical field of gas generating agents, and in particular relates to a gas generating agent granule for an airbag and a preparation process thereof by a pressing method. Background technique [0002] The side airbag gas generator is generally installed in the seat. Due to the short distance from the human body, it is required that the pressure build-up process of the gas generating agent be fast during the combustion process and the outlet pressure be repeated and stable; at the same time, its production cost is required to be low. This requires the gas generating agent to have a relatively high combustion rate, the process can ensure the consistency of the product, and the cost of raw materials and process costs should be controlled as much as possible to achieve the above conditions. Passengers may be injured. [0003] The automobile safety protection buffer system mainly uses a pyrotechnic gas generator to inflate the...

AI Technical Summary

Problems solved by technology

However, the addition of high-energy substances such as AP will greatly increase the combustion temperature. In order to reduce the combustion temperature, a large amount of coolant needs to be added, which has an adverse effect on the generator.

[0005] Chinese patent CN1303338A discloses a kind of perforated conical structure drug pellets using extrusion technology, which can realize the rapid establishment of pressure before slow and then fast, but the strength of the pellets produced by this process is low, and the drug The edges of the grains are at right angles, and the grains will be crushed due to mutual extrusion in the generator, which will affect the stability of the generator product

Therefore, the invention is limited by the process, and the strength of the granules cannot be improved

In addition, after adding sodium carboxymethyl cellulose, the oxidant also needs to be increased, and the proportion of fuel that mainly provides gas production will also decrease relatively, which directly leads to the decline of gas production.

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