CN112624888A

CN112624888A - Gas generating agent for novel safety air bag device

Info

Publication number: CN112624888A
Application number: CN202011049463.9A
Authority: CN
Inventors: 陈肇明
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-04-09

Abstract

The invention discloses a novel gas generating agent for an air bag device, which comprises N, N' -diamino formyl hydrazine, nitrate, an adhesive and an additive. The invention has the content proportion of 43-73 wt% of N, N' -diamino formyl hydrazine, 21-51 wt% of nitrate, 2-10 wt% of adhesive and 1-6 wt% of additive. The nitrate is preferably potassium nitrate, the binder is preferably polyaziridinyl glycidyl ether, and the additive is preferably clay. The preferable particle size of N, N' -diamino formyl hydrazine, nitrate and additive is 1-100 μm. The invention has the obvious advantages that: the combustion intensity is moderate, gas can be provided in time, the speed of the pressure rising initial stage (20-40ms) is easy to adjust, the problems that the air bag damages the body contact part or equipment of a passenger of an automobile and the like caused by the overlarge speed of the pressure rising initial stage are avoided, thermal decomposition does not occur below 200 ℃, the main gas generated by combustion is nitrogen, carbon dioxide, water vapor, oxygen and other non-toxic components, and the raw materials are non-toxic and low in pollution.

Description

Gas generating agent for novel safety air bag device

Technical Field

The invention relates to the field of gas generating agents, in particular to a novel gas generating agent for an air bag safety device.

Background

Airbag devices are applied to safety protection of automobile occupants, and the like, and their applications are expanding.

The gas of the airbag device is generated by a gas generator installed inside thereof, and the core component thereof is a gas generating agent. The gas generating agent can be quickly combusted after being activated and ignited to generate high-temperature and high-pressure gas, and the safety air bag can be quickly expanded, so that the lifesaving emergency purpose of protecting human bodies, equipment and the like is realized.

The gas generating agent capable of generating gas rapidly basically belongs to high-energy substances, and is activated and ignited to burn violently, the gas supply time is only millisecond level, and the problems that the contact part or equipment of the body of a passenger is easy to be injured by a safety airbag due to the fact that the gas supply pressure is too high in the initial stage of rising are generally existed.

Therefore, it is important to develop a gas generating agent which can provide gas in time and has a pressure rise rate which can be easily adjusted.

Disclosure of Invention

A gas generating agent for the air bag of car is suitable for the air bag of car, and features that it can provide gas in time, the speed of gas pressure rising to 20-40ms is easily regulated, and the damage to the air bag and the contact position of car passenger and equipment caused by the excessive speed of pressure rising to the original position is avoided.

A gas generating agent for the air bag unit is composed of N, N' -diamino formylhydrazine, nitrate, adhesive and additive.

Preferably, the components and the weight ratio thereof are 43-73 wt% of N, N' -dicarbamoyl hydrazine; 21-51 wt% of nitrate; 2-10 wt% of adhesive and 1-6 wt% of additive.

Preferably, the nitrate salt is potassium nitrate.

Preferably, the binder is preferably polyazaglycidyl ether.

Preferably, the additive is clay.

Preferably, the particle size of the N, N' -dicarbamoyl hydrazine is 1 μm to 100. mu.m.

Preferably, the nitrate has a particle size of 1 μm to 100. mu.m.

Preferably, the particle size of the additive is 1-100 μm.

The invention has the following beneficial effects and meets the use purpose:

(1) the gas generating agent of the invention has moderate combustion intensity, can realize the purpose of supplying gas in time, has easy adjustment of the speed in the initial pressure rise (20-40ms), avoids the problems that the safety airbag injures the contact part or equipment of the body of the automobile passenger caused by the overlarge speed in the initial pressure rise, and is very suitable for the use of the safety airbag device.

(2) The gas generating agent is not decomposed below 200 ℃, has good thermal stability, and meets the use conditions of the airbag device.

(3) The main gas generated by combustion is nitrogen, carbon dioxide, water vapor, oxygen and other nontoxic components, and is harmless to users.

(4) The gas generating agent has the advantages of non-toxic raw materials, low pollution and environmental protection.

Drawings

FIG. 1 is a graph of the pressure rise in a test chamber measured using a pressure sensor mounted in the chamber;

FIG. 2 is a graph of decomposition temperatures of test samples using a DSC differential scanning calorimeter.

Detailed Description

To facilitate an understanding of the invention, illustrative examples follow. The examples are only for the purpose of facilitating understanding of the present invention and should not be construed as specifically limiting the present invention.

Sample preparation: 39 g of N, N' -diamino formyl hydrazine, 24 g of potassium nitrate, 3 g of polyaziridinyl glycidyl ether and 1.5 g of clay are weighed, mixed and debugged into a test sample.

Example 1

Pressing the test sample into required tablet, filling a proper amount of sample into the cavity of the gas generation tester according to the specification, then installing the tablet in a 60L test box, igniting the test sample by using an igniter, and measuring the pressure rise curve in the box by using a pressure sensor arranged in the test box, wherein the detailed curve is shown in figure 1.

The test results are summarized as follows:

(1) the pressure rise curve P-T results meet the use requirements of the air bag device.

(2) The initial rate value of pressure rise (20-40ms) is 3.0 kPa/ms, which is reduced by 47% compared with the initial rate value of pressure rise of 5.7 kPa/ms under the same conditions of the conventional airbag gas generating agent of the same type.

The above results show that: the gas generating agent of the invention can realize timely gas supply, and the rate of the initial pressure rise is easy to be adjusted, thereby being beneficial to safety and being very suitable for the use of an air bag device.

Example 2

The gas generated by the ignition combustion in example 1 was collected and subjected to a composition test, and the results showed that the main components were nitrogen, carbon dioxide, water vapor and oxygen, and the specific measurement results were as follows

Shown in table 1.

In addition, the contents of harmful gases such as carbon monoxide, nitrogen dioxide and ammonia gas in the generated gas are extremely low, which meets the use purpose, and the specific measurement results are shown in the following table 2.

The gas analysis results show that the gas generated by the combustion of the gas generating agent of the invention is very clean and is suitable for the use of an air bag device.

Example 3

The DSC differential scanning calorimeter is used for testing the decomposition temperature of the sample, and the test result shows that the sample does not generate decomposition phenomenon below 200 ℃, and the detail is shown in figure 2, which shows that the gas generating agent has good thermal stability and meets the use requirement of an air bag device.

The above-mentioned embodiments are further detailed descriptions of the technical solutions and the advantages of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A novel gas generating agent for an airbag device, characterized in that: comprises N, N' -diamino formyl hydrazine, nitrate, a bonding agent and an additive.

2. The gas generating agent for a novel air-bag device according to claim 1, characterized in that: the components and the weight ratio thereof are 43 to 73 weight percent of N, N' -diamino formyl hydrazine, 21 to 51 weight percent of nitrate, 2 to 10 weight percent of adhesive and 1 to 6 weight percent of additive.

3. The gas generating agent for a novel air-bag device according to claim 1, characterized in that: the nitrate is preferably potassium nitrate.

4. The gas generating agent for a novel air-bag device according to claim 1, characterized in that: the binder is preferably a polyazaglycidyl ether.

5. The gas generating agent for a novel air-bag device according to claim 1, characterized in that: the additive is preferably clay.

6. The gas generating agent for a novel air-bag device according to claim 1, characterized in that: the particle size of the N, N' -diamino formyl hydrazine, the nitrate and the additive is 1-100 mu m.