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
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]Therefore it is a primary object of the present invention to provide a gas generant containing polymer adhesive that generates gas quickly for inflating air bags within milliseconds. Moreover, it produces tolerable levels of toxic gases.
[0010]It is another object of the present invention to provide a gas generant containing polymer adhesive that enables the compositions of gas generant forming pellets with better radial tensile strength and axial tensile strength. Moreover, it can enhance the quality of pellets and the reproducibility of the performance.
[0011]It is a further object of the present invention to provide a gas generant containing polymer adhesive that uses aggregating agent to make the solid residue from combustion of the gas generant aggregating into clot whose diameter is larger than that of the screen of the filter. Thus it can reduce both the load of the filter and the amount of the filter used. Furthermore, the cost of the filter is decreased.
[0012]It is a further object of the present invention to provide a gas generant containing polymer adhesive that is made in the form of pellets. It is applied to the air bag systems of the car under the temperature range from −35° C. to 85° C. The air bag is inflated within milliseconds so as to protect the driver and passengers in time.
[0013]A gas generant with polymer adhesive according to the present invention contains 25-45 weight percent nitrogen containing guanidines, 10-30 weight percent hydrogen containing tetrazole or its salts, 20-40 weight percent nitrate oxidizing agent, 1-15 weight percent perchlorate oxidizing agent, 0.1-3 weight percent polymer adhesive, and 1-15 weight percent residue aggregating agent. The nitrogen containing guanidines are mixed with the hydrogen containing tetrazole or its salts as fuel. After the nitrogen containing guanidine reacting with the oxidizing agent, the concentration of generated gas is tolerable. The hydrogen containing tetrazole or its salts can reduce the flame temperature and increase the amount of gas generated. The nitrate oxidizing agent as well as the perchlorate oxidizing agent can increase the reaction rate of gas generant. The polymer adhesive can improve the radial tensile strength and axial tensile strength of pellets of the gas generant. In addition, the residue aggregating agent is used for aggregating the reaction product of alkaline metal oxide so as to improve 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Compositions of gas generates with polymer adhesive

Examples

Experimental program
Comparison scheme
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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(United States)
IPC IPC(8): C06B25/00
CPCC06D5/06C06B21/0066
Inventor HUANG, KONGCHEN, JANQ-KANGTSAI, LONG-MING
Owner HUANG KONG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap