Prepn process of superfine guanidine nitrate specially for safe automobile air bag

Abstract

The preparation process of superfine guanidine nitrate specially for safety airbag in automobile includes the following steps: 1) crushing guanidine nitrate material mechanically into 200 mesh powder; 2) further crushing guanidine nitrate in high pressure fluidized bed airflow mill into class-I superfine guanidine nitrate powder; 3) adding anticaking agent in 0.4-0.9 wt% into the superfine guanidine nitrate powder via homogeneously mixing; and 4) dispersing superfine guanidine nitrate powder with added anticaking agent in disc type airflow mill to obtain the superfine guanidine nitrate powder product. The present invention has anticaking agent added in proper time and proper technological process to produce superfine guanidine nitrate powder product suitable for airbag inflating agent in automobile.

Description

technical field [0001] The invention relates to an automobile airbag, in particular to a processing technology for superfine guanidine nitrate special for the automobile airbag. Background technique [0002] With the continuous improvement of traffic safety awareness, automobile airbags are gradually being widely used in our country. Its working principle is that when the vehicle collides, the control module quickly processes the signal, confirms that the severity of the collision has exceeded the protection ability of the seat belt, and then quickly releases the airbag to make the occupant's head and chest directly contact with the relatively soft and elastic The airbag is in contact with the airbag, thereby reducing the occupant's injury through the cushioning effect of the airbag. [0003] Airbag inflators often need to be ignited within 50 to 60 milliseconds of a car accident and quickly produce a large amount of non-toxic gas, and can be guaranteed to be effective for ...

AI Technical Summary

Problems solved by technology

When ultra-fine guanidine nitrate is used as the main component of automobile airbag inflator, its particle size requirements are: D50=4.5-6.5μm, D98≤14μm, and the particle size is normally distributed, but because guanidine nitrate is easy to absorb moisture, especially Especially in the process of ultra-fine processing, due to the moisture in the material itself and the moisture in the air, when the particle size of guanidine nitrate reaches several μm or even tens of μm or less, the surface area of ​​the material increases greatly, and it is very easy to die due to moisture absorption. Particle adhesion occurs, resulting in agglomeration and agglomeration, so processing is extremely difficult. During long-term transportation, storage and use, agglomeration and agglomeration will also occur due to its own moisture and contact with air

[0005] The existing processing method is to add an anti-caking agent to the guanidine nitrate raw material first, and then pulverize, but, because the volume and specific gravity of the anti-caking agent particles are much smaller than those of the guanidine nitrate raw material particles, during the pulverization process, the anti-caking agent The particles of the agent are blown away by the high-pressure airflow, so the anti-caking agent cannot play the role of preventing caking and agglomeration, so it is difficult for the finished product to meet the required particle size requirements