Ignition powder, preparation method and application thereof, and airbag gas generator

Abstract

The invention provides an ignition powder, its preparation method and application, and an airbag gas generator, belonging to the technical field of ignition powder. The ignition powder, raw materials include the following components in mass percentage: potassium perchlorate: 30% to 50%; basic copper nitrate: 5% to 20%; fuel: 30% to 60%; metal oxides: 1% to 15%; metal powder: 1%-15%; the metal powder is at least one of titanium powder, magnesium powder, copper powder, iron powder, zirconium powder, hafnium powder, tungsten powder or silicon powder. The ignition powder further improves the moisture absorption resistance, and the ignition performance is stable and reliable at a temperature of -40°C ~ +90°C. When the gas generating agent is ignited, the ignition is uniform, the consistency is better, the sensitivity is low, and it can be ignited by ordinary electric squibs. , Burning rate 35% BPF greater than 12, low friction sensitivity, safe and reliable process, suitable for mass production and preparation; since the formula does not contain aluminum powder, it avoids potential safety hazards and combustion residues.

Description

technical field [0001] The invention relates to an ignition agent composition with reliable ignition performance and a preparation method thereof, in particular to an ignition agent with reliable ignition performance, good moisture absorption resistance and high-efficiency production, belonging to the technical field of ignition agents. Background technique [0002] Ignition powder is a very important type of pyrotechnic agent, which is often used to accept external stimuli to ignite other agents, such as propellants and propellants. The invention relates to an ignition composition for a gas generator, which is used for a safety airbag device in a motor vehicle. The performance of the ignition charge will directly affect the normal operation of the entire restraint system, so it occupies a very important position in the charge system. Location. [0003] At present, the main types of ignition powder are black powder, 5AT and strontium nitrate type, B-KNO 3 Ignition powder, ...

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Problems solved by technology

[0004] For example, the patent US6487974B1 mainly contains 26% of 5AT, 64% of strontium nitrate, 7% of aluminum powder, and 1% of boron nitride. Although 7% of aluminum powder is helpful for low-temperature ignition performance, this formula contains more strontium nitrate and 5AT. 5AT and strontium nitrate raw materials are extremely hygroscopic materials, which bring harsh conditions to production, assembly, and storage, and even bring certain risks to the use and storage of the generator. In addition, the sensitivity of aluminum powder is low. In particular, there are certain risks in the tableting and granulation process;

[0005] Patent US6599380 provides an ignition powder, which mainly contains 39% guanidine nitrate, 21% potassium perchlorate, 30% copper oxide and 10% aluminum. Although this formula has a certain resistance to hygroscopicity, the formula is stable at 23°C ± 2°C. The lower burning rate of 35% BPF is only 9.8, which cannot meet the higher burning rate requirements; this formula has a lot of residue after burning, which increases the cost of filtration. In addition, aluminum powder forms larger droplets during the combustion process and comes out of the ignition hole for ablation and filtration Net, easy to cause air pockets and personal injury; the low detonation heat of this formula cannot meet the high heat requirements of igniting powder, and due to the existence of components such as aluminum powder and metal oxides, the igniting powder of this formula is easy to store and transport. fire and explosion

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