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Basic metal nitrate, process for producing the same and gas generating agent composition

a technology of metal nitrate and gas generating agent, which is applied in the direction of weapons, chemistry apparatus and processes, explosives, etc., can solve the problems of toxicity to human bodies or hazards in the handling of sodium azide, and achieve the effect of high process for producing the sam

Inactive Publication Date: 2009-04-23
ZHOU XINGXI +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The invention provides a gas generating composition with high thermal stability, low combustion temperature, high burning rate, small amounts of carbon monoxide and nitrogen oxides formed, good combustion stability, and a low impurity content. The gas generating composition comprises a basic metal nitrate and a fuel. The basic metal nitrate has specific requirements for its particle size, degree of crystallinity, and impurity content. The invention also provides a process for producing the basic metal nitrate. The gas generating composition can be used in an air bag and has good air bag deployment and ignition properties."

Problems solved by technology

However, a toxicity [LD50 (oral-rat)=27 mg / kg] to human bodies or hazards in handling of sodium azide has been regarded as a serious problem.
However, the above non-azide based gas generating composition is problematic in a combustion temperature, a burning rate, phase transfer, amounts of carbon monoxide and nitrogen oxides generated, a gas output and the like.
For example, the gas generating composition of U.S. Pat. No. 4,369,079 has a high combustion temperature, and requires a large amount of a coolant in actual use.
In the gas generating agent of JP-A 10-72273, a shape is changed due to phase transfer of ammonium nitrate in the range of the use temperature, which damages a molded article of the gas generating agent, and in result, stable combustion cannot be obtained.
Since both of these two related art use the metallic catalyst as an essential component, the production cost is high.
Thus, this is not practical at present especially because downsizing of a gas generator is in high demand.
In addition, for a non-azide based gas generating agent, physical and chemical interactions are exerted in some combination of a fuel and an oxidizing agent over a long period of time.
Consequently, problems arise such that a fuel component is gradually decomposed and a thermal decomposition temperature of the fuel becomes lower than an originally designed temperature.

Method used

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  • Basic metal nitrate, process for producing the same and gas generating agent composition
  • Basic metal nitrate, process for producing the same and gas generating agent composition
  • Basic metal nitrate, process for producing the same and gas generating agent composition

Examples

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Effect test

example 1

[0204]36.3 g of copper nitrate 3-hydrate was charged in a beaker fitted with a stirrer, and then dissolved in 100 ml of distilled water which was poured therein, while being stirred. The resulting solution was heated at 60° C. A solution of 18.9 g of sodium bicarbonate in 240 ml of water was added over 1 hour. After the addition was completed, the mixture was aged while being stirred at 60° C. for 60 minutes. The resulting gel-like precipitate was filtered at room temperature, and washed with distilled water. A pale blue solid matter having quite a good filterability was obtained. When a part of the washed product was dried in air at 110° C., the product maintained the pale blue color, and the thermal stability was quite good. The remaining washed product was dried at 110° C. under reduced pressure of 1,333.22 Pa to obtain a basic copper nitrate in an amount of 17.4 g (yield 96.5%). The results of measurements are shown in Table 1.

example 2

[0205]36.3 g of copper nitrate 3-hydrate was charged in a beaker fitted with a stirrer, and then dissolved in 100 ml of distilled water which was poured therein, while being stirred. The resulting solution was heated at 80° C. A solution of 18.9 g of sodium bicarbonate in 240 ml of water was added over 1 hour. Immediately after the addition was completed, a precipitate was filtered, and washed with distilled water to obtain a pale blue solid matter having quite a good filterability. When a part of the washed product was dried in air at 110° C., the product maintained the pale blue color, and the thermal stability was good. The remaining washed product was dried at 110° C. under reduced pressure of 1,333.22 Pa to obtain a basic copper nitrate. The results of measurements are shown in Table 1.

example 3

[0206]214.6 g (1.00 mol) of copper nitrate 3-hydrate was charged in a beaker fitted with a stirrer, and then dissolved in 500 ml of distilled water which was poured therein, while being stirred. The resulting solution was heated at 40° C. A solution of 126 g (1.50 mols) of sodium bicarbonate in 1,000 ml of distilled water was added over 1 hour. After the addition of sodium bicarbonate was completed, the mixture was heated to 8° C., and aged for 30 minutes while being stirred. A precipitate was filtered, washed, and dried to obtain a pale blue basic copper carbonate. The results of measurements are shown in Table 1.

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Abstract

Provided is a basic metal nitrate suitable as an oxidizing agent for a gas generating agent, which is a basic metal nitrate having a good thermal stability and meeting at least one requirement of the following (a) to (d):(a) a particle diameter of 0.5 to 40 μm; (b) a degree of crystallinity having 0.4 deg or less of a half band width of the peak in the X-ray analysis; (c) an initiation temperature of weight loss being 220° C. or higher according to TG-DTA analysis; and (d) an impurity content of 1,000 ppm or less based on Na atom. Further provided is a gas generating composition which has a low toxicity, a high burning rate and a low combustion temperature and which is used in a gas generator for an air bag. The gas generating composition comprises (a) tetrazole derivatives, guanidine derivatives or a mixture thereof, (b) a basic metal nitrate and (c) a binder and / or a slag-forming agent.

Description

[0001]This application is a Continuation of co-pending application Ser. No. 09 / 914,548 filed on Aug. 30, 2001, for which priority is claimed under 35 U.S.C. §120. Application Ser. No. 09 / 914,548 is the national phase under 35 U.S.C. §371 of International Application No. PCT / JP00 / 06664, filed on Sep. 27, 2000. The entire contents of both of the above-identified applications are hereby incorporated by reference. This application also claims priority under 35 U.S.C. § 119 to Applications Nos. 11-271976; 11-287507; 2000-71680; 2000-71753; 2000-128077; 2000-281421; and 2000-282972, filed in Japan respectively on Sep. 27, 1999; Oct. 8, 1999; Mar. 15, 2000; Mar. 15, 2000; Apr. 27, 2000; Sep. 18, 2000; and Sep. 19, 2000.TECHNICAL FIELD TO WHICH THE INVENTION BELONGS[0002]The present invention relates to a novel basic metal nitrate, a process for producing the same, a gas generating composition, its molded article and a gas generator for an air bag using the gas generating composition. It is...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C06B45/30C06B45/04C06B45/06C06B45/10C01B21/48C01G1/08C01G3/08C06B31/00C06D5/06
CPCC01B21/48C01G1/08C01G3/08C01P2002/74C06D5/06C01P2004/62C01P2006/80C06B31/00C01P2004/61C01B21/06
Inventor ZHOU, XINGXIMATSUOKA, KAZUYUKIWU, JIANZHOUYAMATO, YOTAKAHORI, TAKESHIYAMAZAKI, KAORU
Owner ZHOU XINGXI
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