安全气囊气体发生剂中AP加入工艺改进研究

Improvement research on addition process of AP in gas generator for safety airbag

在安全气囊气体发生剂的生产中,改变将传统的高氯酸铵(AP)与原材料一起干混后再进行湿混的制剂工艺,先将AP溶于水,再将所得溶液在湿混过程中加入。采用这种工艺,原来配方中使用的细粒度AP均可用粗粒度的I类AP代替,从而使AP成本降低70%～80%。此外,药粒的堆积密度未发生变化,药剂低温点火时间从5～6 ms缩短至3～4.5 ms,且使干混过程的撞击感度降低为0。新工艺在提升药剂性能的同时,提高了药剂生产制作过程中的安全性。

In the production of the gas generator for the safety airbag, the traditional preparation process including first dry mixing of ammonium perchlorate(AP) with raw materials and then wet mixing was changed. The AP was first dissolved in water, and then the obtained solution was added during the wet mixing process. Using this process, the fine size AP used in the original formulation can be replaced by the coarse size Class I AP, thus the cost of AP reduced by 70%~80%. In addition, the bulk density of the powder granules did not change, the ignition time at low temperature of the powder reduced from 5~6 ms to3~4.5 ms, and the impact sensitivity of the dry mixing process reduced to 0. The novel process can not only improve the performance of the powder, but also improve the safety performance in the production process of the powder.