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Gas generating composition

Inactive Publication Date: 2005-05-12
DAICEL CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] The composition of the invention has a good ignition property and combustibility (a high burning rate) and can decrease the generation amounts of NOx and ammonia gas at the time of combustion, so that the amounts of NOx and ammonia to be contained in the combustion gas can be suppressed.
[0041] If the oxygen balance is in the above range, the production amounts of NOx and ammonia can be decreased, so that the combustion gas becomes clean.

Problems solved by technology

However, in EP-B No. 1,006,096 and US-A1 No.2003 / 0145921, the use ratio of the perchloric acid salt to BCN is high and the supply of oxygen becomes excessive, so that, the generation amounts of NOx and mist are unsatisfactorily increased.
Further, normally in this system, so much BCN is contained that the cleanness level of the discharged gas is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples 3 and 4

[0050] The gas generating compositions shown in Table 2 were produced. The friction sensitivity test and drop hammer sensitivity test with respect to the compositions were conducted according to the explosive performance test method of JIS K4810-1979. The results are shown in Table 2.

TABLE 2DrophammerCompositionFrictionsensitivity(composition ratio: % by mass)sensitivity (N)(cm)Example 3GN / BCN / CMCNa / KClO4>353>600(44.1 / 48.4 / 5 / 2.5)Example 4GN / BCN / CMCNa / NaClO4>353>60(44.37 / 48.13 / 5 / 2.5)

[0051] The compositions of Examples 3 and 4 were found having the friction sensitivity exceeding 353 N and the drop hammer sensitivity exceeding 60 cm, and they are insensitive in the friction sensitivity and the drop hammer sensitivity, and thus they have high handling safety.

example 5

[0052] 1,888.5 g of guanidine nitric acid salt, 2,269 g of basic copper nitrate, 500 g of aluminum hydroxide, 250 g of CMCNa, 100 g of sodium perchlorate, and 700 g of water were loaded to a mixer and mixed all together. The mixture was extruded by an extruder, cut, and dried to obtain a single hole type gas generating composition having the outer diameter of 4.25 mm, the inner diameter of 1.10 mm, and the length of 4. 08 mm. 40.3 g of the gas generating composition was air-tightly sealed in a chamber having the inner diameter of 57 mm and the height of 32 mm to produce an inflator for a test.

[0053] Using the inflator, a well-known 60-liter tank test (e.g. disclosed in column 22 of JP-A No. 2001-97176) and a discharged gas test of a 2800-liter tank were carried out. The 2800-liter tank test was carried out by setting the inflator in a tank made of an iron and having a capacity of 2,800 liters; igniting the inflator; measuring the concentrations of NO, NO2, CO and NH3 in the tank af...

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PUM

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Abstract

The invention provides a gas generating composition having a good ignition property and combustibility and generating suppressed amounts of toxic gases such as NOx and ammonia at the time of combustion. The gas generating composition comprises (A) a nitrogen-containing compound as fuel, (B) a basic metal nitrate and (C) a chloric acid compound as oxidizing agents, the chloric acid compound (C) is (C-1) a perchloric acid salt and / or (C-2) a chloric acid salt and the content of the component (C) is less than 5% by mass in the total oxidizing agents.

Description

TECHNICAL FIELD OF THE INVENTION [0001] The invention relates to a gas generating composition to be used for a gas generator for an air bag. PRIOR ARTS [0002] A gas generating composition comprises fuel, an oxidizing agent and a variety of additives to be added based on the necessity, and the composition is required to satisfy that the gas generated by combustion is clean, in other words, the gas contains no nitrogen oxide (NOx), CO, or the like. [0003] It has been known that basic copper nitrate (BCN) known as an oxidizing agent decreases the combustion temperature because of low combustion heat generation and suppresses the production amount of NOx and thus has an effect to clean the discharged gas, and it also has an effect to improve the ignition and the combustion properties and therefore, it has been used widely as an oxidizing agent. [0004] However, if the content of BCN as an oxidizing agent is too high, it results in a problem that the generation amounts of NOx and ammonia ...

Claims

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Application Information

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IPC IPC(8): C06D5/06
CPCC06D5/06
Inventor WU, JIANZHOU
Owner DAICEL CHEM IND LTD
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