Ignition powder composition for igniter

a technology of ignition powder and composition, which is applied in the direction of explosives, pedestrian/occupant safety arrangements, vehicular safety arrangements, etc., can solve the problems of increasing the risk of accidental ignition in the handling of metal powder during production, lowering and increasing the risk of accidental ignition in the handling of metal powder, so as to improve the safety of the igniter production process, and reduce the friction sensitivity of ignition powder

Inactive Publication Date: 2013-11-21
NIPPON KAYAKU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021]The ignition powder composition for igniter according to the present invention can provide ignition powder for igniter, meeting the required firing current sensitivity with lowered friction sensitivity. Lowering friction sensitivity of ignition powder prevents accidents resulted from accidental ignition of ignition powder due to friction, which has been a problem in producing ignition powder and igniters. Safety in igniter production process can be improved, and quick response igniters can be produced. Moreover, a gas generator for seat belt pretensioner and a gas generator for airbag can be provided, which use igniters charged with such ignition powder compositions for igniter.

Problems solved by technology

However, PTL 1 involves obtaining an ignition powder composition which is a single increment initiator charge containing zirconium as an essential ingredient, and ensures sufficient heat for ignition, and it is not aimed at lowering friction sensitivity of ignition powders.
On the other hand, the risk of accidental ignition in handling of the metal powder during production is increased, so that safety has been an issue.
It is particularly known that zirconium generally used as metal powder contained in ignition powder is excellent in ignition performance, but is at high risk of accidental ignition when being handled during production.
However, this technique has the disadvantages that the metal powder is required to have specially shaped particles, production control of the metal powder is difficult, and the production cost is high.

Method used

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  • Ignition powder composition for igniter
  • Ignition powder composition for igniter
  • Ignition powder composition for igniter

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0065]Nitrocellulose was dissolved as a binder in isoamyl acetate to prepare an isoamyl acetate solution having a binder concentration of 2 mass %. Next, 1.5 g of the isoamyl acetate solution of the above binder (binder concentration: 2 mass %) was added to a mixture of 8.55 g of zirconium hydride (particle size: 2.5 μm), 9.6 g of tungsten (particle size: 0.6 μm to 0.8 μm), 11.85 g of potassium perchlorate (particle size: 12 μm to 18 μm), and 0.15 g of magnesium oxide. Then, 11 g of isoamyl acetate was further added and mixed together in a mixer. After the mixing, the obtained mixture was spread on a palette and air-dried. After the air-drying, the mixture was passed through a 24 mesh (about 0.8 to 0.6 mm aperture) screen for granulation, and the obtained granules were introduced into a dryer to be dried at 60° C. Thus, ignition powder for igniter (approximately 30 g) of Example 1 was obtained.

examples 2 to 4

[0066]Further, ignition powders for igniter of Examples 2 to 4 were prepared by the same preparation method as Example 1 with the component ratios of the components being altered as shown in Table 1.

example 5

[0076]Ignition powder for igniter of Example 5 was prepared by the same preparation method as Example 1 (1.5 g of an isoamyl acetate solution (binder concentration: 2 mass %) containing nitrocellulose as a binder was added to 0.15 g of magnesium oxide), except for using the composition containing 6.3 g of titanium hydride (particle size: 8.0 μm), 9.6 g of tungsten (particle size: 0.6 μm to 0.8 μm), and 14.1 g of potassium perchlorate (particle size: 12 μm to 18 μm).

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Abstract

An ignition powder composition for igniter of which friction sensitivity can be lowered with the required firing current sensitivity being achieved is provided as ignition powder for an igniter that is activated by an electrical signal. The ignition powder composition for igniter contains metal hydride (A); metal powder (B) that is one or more selected from the group consisting of tungsten powder, molybdenum powder, aluminum powder, titanium powder, and magnesium powder; and perchlorate (C).

Description

TECHNICAL FIELD[0001]The present invention relates to an ignition powder composition for igniter and an igniter using the ignition powder composition. In particular, the present invention relates to an ignition powder composition for igniter used in electric initiators or airbags built in automobiles, and to an igniter (so-called squib) using the ignition powder composition. In more particular, the present invention relates to an ignition powder composition for igniter meeting the required firing current sensitivity with lowered friction sensitivity and an igniter using the ignition powder composition.BACKGROUND ART[0002]Various igniters have been developed as igniters provided for gas generators used in safety equipment of automobiles such as airbags or seat belt pretensioners. Such an igniter is generally charged with ignition powder which is ignited with little electrical energy, and the ignition powder works to activate the gas generator by ignition in immediate response to the ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C06D5/06
CPCC06D5/06B60R2021/26029C06B33/06C06C9/00
Inventor FUKUMOTO, MAIKOKIMURA, AYUMU
Owner NIPPON KAYAKU CO LTD
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