Gas-generating agent composition

a technology of gas-generating agent and composition, which is applied in the direction of pressure gas generation, explosives, weapons, etc., can solve the problems of unstable development time and literature that does not describe pressure exponents at all, and achieve excellent stability of development time, low pressure dependence of burning rate, and very high pressure exponents

Inactive Publication Date: 2012-10-18
THE UNIV OF TOKYO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]According to the present invention, since the ratio of the nitrogen-containing organic compound to ammonium nitrate is a specific value or less, the pressure exponent is very small as compared with a conventional one, and the pressure dependence of the burning rate is extremely low. Therefore, an air bag excellent in the stability of development time can be obtained.

Problems solved by technology

Thus, since the burning rate of a gas-generating agent is influenced by pressure, the development time will be unstable according to the circumstances of air bag development.
Japanese Patent No. 4248254 discloses a gas-generating agent composition containing a nitrogen-containing organic compound fuel and an oxidizing agent, wherein a part or all of the oxidizing agent is a heat-treated oxidizing agent obtained by mixing ammonium nitrate and basic copper nitrate and subjecting the mixture to heat-treatment at a temperature from 120° C. to 160° C. However, this literature does not at all describe the pressure exponent, and the oxidizing agent needs to be heat-treated.
However, this literature also does not at all describe the pressure exponent, and ammonium nitrate requires a phase stabilizer.

Method used

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Examples

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examples

[0033]The present invention will be described in more detail below based on Examples, but the present invention is not limited by these Examples.

examples 1 to 5

, Comparative Examples 1 to 4

[0034]Guanidine nitrate (may be abbreviated as “GN”), ammonium nitrate (may be abbreviated as “AN”), and basic copper nitrate (may be abbreviated as “BCN”) were dry-blended to obtain gas-generating agent compositions each having the composition shown in Table 1. These compositions were press molded using a hydraulic cylinder under a pressure of 100 kg / cm2 into a strand having a height of about 12.7 mm and a diameter of about 10 mm. Next, the surface of the strand was coated with an incombustible epoxy resin. The burning rate (mm / s) was measured in a nitrogen atmosphere of a specified pressure. The values of the pressure exponent n and the constant a were determined based on the following relational expression (1) between the burning rate (mm / s) and pressure (MPa):

r=aPn  (1)

where r represents a burning rate; P represents a burning pressure; a represents a constant; and n represents a pressure exponent. Note that measurement of the burning rate was perform...

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Abstract

There is provided a gas-generating agent composition having a very small pressure exponent and an extremely low pressure dependence of the burning rate. The gas-generating agent composition of the present invention contains a nitrogen-containing organic compound as a fuel and ammonium nitrate as an oxidizing agent, wherein the ratio of the nitrogen-containing organic compound to the ammonium nitrate (the former/the latter: weight ratio) is 35/65 or less. In the gas-generating agent composition, a copper compound may be further blended in a proportion of more than 0 part by weight and 30 parts by weight or less based on 100 parts by weight of the total amount of the nitrogen-containing organic compound and ammonium nitrate. The copper compound is preferably basic copper nitrate. Further, the nitrogen-containing organic compound is preferably a guanidine derivative, particularly preferably a guanidine nitrate.

Description

TECHNICAL FIELD[0001]The present invention relates to a gas-generating agent composition for an air bag inflator for motor vehicles and the like.BACKGROUND ART[0002]A non-azide gas-generating agent has been developed as a gas-generating agent composition for air bag systems mounted in vehicles such as motor vehicles, instead of sodium azide which has a problem in respect of toxicity. As the non-azide gas-generating agent, there has been proposed a gas-generating agent composition using a nitrogen-containing organic compound such as a guanidine derivative and a tetrazole as a fuel and ammonium nitrate as an oxidizing agent.[0003]On the other hand, the air bag is required for the stability of development time particularly in terms of safety. The development time depends on the burning rate of a gas-generating agent. The burning rate generally tends to be affected by pressure, and the relationship between the burning rate and pressure is represented by the following expression (1):r=aP...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C06B31/28C06B31/32
CPCC06D5/06
Inventor ARAI, MITSURUWADA, YUSUKETOMIYAMA, SHOGOIWAI, YASUNORIODA, SHINGO
Owner THE UNIV OF TOKYO
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