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Compositions of gas generates with polymer adhesive

a technology of gas generants and adhesives, which is applied in the field of chemical compositions, can solve the problems of reducing the cost of the filter, producing tolerable levels of toxic gases, etc., and achieves the effects of improving the quality of pellets, reproducibility, and radial tensile strength and axial tensile strength

Inactive Publication Date: 2009-03-05
HUANG KONG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a gas generant containing polymer adhesive that generates gas quickly for inflating air bags within milliseconds. It produces tolerable levels of toxic gases and enhances the quality of pellets and the reproducibility of the performance. It also reduces the load of the filter and the amount of filter used, decreasing the cost. The gas generant with polymer adhesive is made in the form of pellets and can be applied to the air bag systems of the car under a wide range of temperatures. The nitrogen containing guanidines, hydrogen containing tetrazole or its salts, nitrate oxidizing agent, perchlorate oxidizing agent, polymer adhesive, and residue aggregating agent are used in the gas generant composition. The nitrogen containing guanidines and hydrogen containing tetrazole or its salts as fuel react with the oxidizing agents to generate gas. The polymer adhesive improves the strength of the pellets and the efficiency of the filter.

Problems solved by technology

Moreover, it produces tolerable levels of toxic gases.
Furthermore, the cost of the filter is decreased.

Method used

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  • Compositions of gas generates with polymer adhesive

Examples

Experimental program
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Effect test

example 1

[0026]The gas generant composition is prepared by taking 10 gm vinyl alcohol acetate resin in a stirring machine, dissolving it into 1000 ml industrial alcohol, adding 70 gm silicon dioxide with average diameter of 10 nm, 350 gm nitroguanidine with average diameter of 5 μm, 190 gm 5-aminotetrazole with average diameter of 10 μm, 305 gm potassium nitrate with average diameter of 20 μm, and 75 gm potassium perchlorate with average diameter of 10 μm in order, stirring the mixture into p aste, heating the paste at 60° C., stirring continuously until the industrial alcohol evaporates, using a screen with screen sizing of 425 μm to crush the product, heating the mixture in an oven setting at 105° C. for 24 hours, then the dried mixture is cooled down to room temperature. The dried mixture is pressed into pellets with 6 cm diameter×4 cm height by a pelletizing machine. The radial tensile strength of the pellet is 16 kg / cm2 and the axial tensile strength of the pellet is 15 kg / cm2.

[0027]The...

example 2

[0029]The manufacturing processes of this example are the same with above one while the VAAR is replaced by starch. The combustion temperature, carbon monoxide concentration and carbon dioxide concentration of this example are all higher than those of the example one.

example 3-5

[0030]Gas generant compositions are formulated according to table 2 below (amounts in parts by weight). As shown in table 2, the amounts of potassium nitrate and potassium perchlorate are different in different examples.

TABLE 2componentExample 3Example 4Example 5nitroguanidine33%33%33%5-aminotetrazole23%23%23%potassium nitrate35%30%25%potassium 0% 5%10%perchloratesilicon dioxide8.6% 8.6% 8.6% (SiO2)vinyl alcohol0.4% 0.4% 0.4% acetate resin(VAAR)combustion1910 K1929 K2001 Ktemperaturecarbon monoxide7.49E−27.70E−27.95E−2concentrationcarbon dioxide5.72E−26.27E−26.78E−2concentration

[0031]The combustion temperature, carbon monoxide concentration and carbon dioxide concentration are calculated by the computer program CEC76 of NASA (National Aeronautics and Space Administration).

[0032]The manufacturing processes of these examples are the same with the example one. The potassium perchlorate contains more oxygen than the potassium nitrate so that the gas generant with more potassium perchlor...

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Abstract

Compositions of gas generants with polymer adhesive are disclosed. The gas generant compositions include nitrogen containing guanidines, hydrogen containing tetrazole, oxidizing agent, polymer adhesive, and residue aggregating agent. The nitrogen containing guanidines range from 25 to 45 weight percent. The hydrogen containing tetrazole is 10-30 weight percent. The nitrate oxidizing agent is 20-40 weight percent. The perchlorate oxidizing agent ranges from 1 to 15 weight percent. The polymer adhesive is 0.1-3 weight percent and the residue aggregating agent weights from 1 to 15 weight percent. The gas generant pellets are applied to inflators for generating gas so that the air bag is inflating instantly for protecting driver and passengers in automobile.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to chemical compositions, especially to gas generants containing polymer adhesive that are applied to inflators for generating gas to inflate air bag.[0002]In order to reduce the casualties in car accidents, the bag in air bag system is inflated quickly to protect the driver and the passengers when the sensor is sensing the crash of the car. In early days, sodium aizde gas generant is used most common for generating gas to inflate the air bag. The advantages of sodium aizde gas generants are producing non-toxic gases and generating low flame temperature gas. The costs of raw materials are low. The sodium azide gas generants have long storage stability and good safety property. However, sodium aizde is a toxic compound that leads to uncomfortable feelings such as headaches and rapid breathing when people are breathing the sodium azide powder.[0003]Moreover, sodium aizde is easy to react with heavy metal to form highly-rea...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C06B25/00
CPCC06D5/06C06B21/0066
Inventor HUANG, KONGCHEN, JANQ-KANGTSAI, LONG-MING
Owner HUANG KONG
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