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Enhanced slag formation for copper-containing gas generants

A gas generating agent and slag-making technology, which can be used in the production of compressed gas, attack equipment, non-explosive/non-thermal agent components, etc., and can solve problems such as adverse effects on system efficiency

Active Publication Date: 2015-10-28
AUTOLIV ASP INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This has an adverse effect on the weight of the inflator, which in turn has an adverse effect on system efficiency

Method used

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  • Enhanced slag formation for copper-containing gas generants
  • Enhanced slag formation for copper-containing gas generants
  • Enhanced slag formation for copper-containing gas generants

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0060] Experiments were conducted to determine the effect of aluminum hydroxide particle size on slagging in a typical gas generant formulation. Comparative Example 1 was conventional smaller sized aluminum hydroxide particles, while Example 2 was prepared according to certain aspects of the present teachings. Table 2 shows the components and properties of the gas generants of Comparative Example 1 and Example 2.

[0061]

[0062]

[0063] Table 2

[0064] The above two formulations were prepared separately and pressed into 0.5" diameter x 0.43" cylinders using a force of 12000 lbs. These samples were prepared by spray drying a formulation comprising guanidine nitrate, basic copper nitrate, biguanide formamide copper nitrate and glass fibers. Aluminum hydroxide of different particle sizes was then mixed into the spray-dried formulation and pressed into 0.5 x 0.43" diameter cylinders. The cylinders were then burned in a 1 liter closed tank under 3000 psi nitrogen. Altho...

example 2

[0067] The gas generants of Comparative Examples 1 and 2 described in the Background of Example 1 were also compressed into 0.25" diameter x 0.060" sheets, loaded into the driver's side automotive air bag inflator, and deployed in a 60 liter water tank middle. After deployment, the tank is flushed, and the wash water is collected. Insoluble particulates were captured on a filter and weighed after drying. Any soluble particulates were precipitated by evaporating the wash water and weighed. The total particulate escaping from the combustion filter was determined by adding together the weights of soluble and insoluble particulate found in the tank. This value is called the "tank wash value".

[0068] In Table 3 the water washout values ​​of the gas generants from Comparative Example 1 and Example 2 are given.

[0069]

Comparative example 1

Example 2

Washing value (g)

2.5-3.9

0.5-0.9

[0070] table 3

[0071] As shown in Table 3, comp...

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Abstract

Gas generants comprising copper are provided that have improved slagging ability. In certain aspects, the gas generants include a fuel, an oxidizer comprising basic copper nitrate, and a large particle size endothermic slag-forming component, such as aluminum hydroxide (Al(OH)3). The gas generants may be cool burning, e.g., having a maximum flame temperature at combustion (Tc)≰about 1,900K (1,627° C.). The disclosure also provides methods of enhancing slag formation for a gas generant composition that comprises copper. Such methods enhance slag formation during combustion of the gas generant composition by at least 50%.

Description

technical field [0001] The present invention relates to the enhancement of slagging capability in copper-containing gas generants by the incorporation of large particle size endothermic slagging components. Background technique [0002] This section provides background information related to the present disclosure which is not necessarily prior art. [0003] Passive inflatable restraint systems are used in a variety of applications, such as motor vehicles. For example, some types of passive inflatable restraint systems use pyrotechnic gas generating agents to inflate air bag cushions (e.g., gas initiators and / or inflators) or to actuate seat belt tensioners (e.g., micro-gas generators ), minimizing the damage to the occupants. The performance and safety requirements of automotive air bag inflators continue to increase in order to improve passenger safety while at the same time striving to reduce manufacturing costs. [0004] Therefore, increasing the functionality of the ...

Claims

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Application Information

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IPC IPC(8): C06B23/04C06B31/00C06B29/02
CPCC06B23/00C06B23/001C06B23/04C06D5/06
Inventor 伊万·V·门登豪布拉德利·W·史密斯
Owner AUTOLIV ASP INC