CN102173973B - Igniter for gas generator of safety gasbag and preparation method thereof - Google Patents
Igniter for gas generator of safety gasbag and preparation method thereof Download PDFInfo
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- CN102173973B CN102173973B CN 201010619218 CN201010619218A CN102173973B CN 102173973 B CN102173973 B CN 102173973B CN 201010619218 CN201010619218 CN 201010619218 CN 201010619218 A CN201010619218 A CN 201010619218A CN 102173973 B CN102173973 B CN 102173973B
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Abstract
The invention provides an igniter for a gas generator of a safety gasbag, comprising the following components in percentage by weight: 55-80% of nitrate of alkali metal or alkaline earth metal, 17-43% of powdered boron, 1-5% of second reducing agent and 1-4% of water soluble binder, wherein the second reducing agent is nitrogen-rich guanidines, azoles or amines. The invention also provides the preparation method of the igniter. The igniter provided by the invention has the characteristics of simplicity, safety, low production cost and superior comprehensive ignition performance.
Description
Technical field
The present invention relates to a kind of gas-generating agent composition and preparation method thereof, particularly a kind of starting mix agent for automobile safety air bag gas generator and preparation method thereof.Belong to the vehicle passive safety field.
Background technology
Gas generator for safety air sac is divided into firework type gas generator, hybrid gas generator and cold air type producer gas generator.Yet, no matter which kind of producer gas generator all will adopt electric igniter, to become initiation energy from the electrical signal conversion of electronic control unit, firework type gas generator and hybrid gas generator are passed to gas generating powder with all needing energy fast and stable that the fiery tool of electricity is detonated.And the medicament that plays this biography fire action between ignition element assembly and gas generating powder is exactly starting mix.
It is starting mix (take boron powder and saltpetre as main) that existing starting mix has boron; Magnesium is that starting mix (combustiblematerials is magnesium powder or magnesium, Al alloy powder, and oxygenant is saltpetre, potassium perchlorate or tetrafluoroethylene), zirconium are starting mix (zirconium powder and ferric oxide).
And car safety air bag to adopt boron with starting mix be starting mix more because its long storage stability is good, igniting is reliable, ignition ability is strong, temperature of combustion is high, produce more red-hot solid particulate after the burning.
The boron that prior art is produced is that starting mix has following problem and shortcoming:
1, the boron of prior art+saltpetre starting mix require saltpetre granularity below 325 orders, and lump after the easy moisture absorption of ultra-fine saltpetre of this kind specification, use and store all very inconvenient.
2, saltpetre and boron powder mix usually employing mechanically mixing technique, and this technique mixed effect is bad, and production security is poor, and production efficiency is extremely low.
3, gas production rate is low, and for the needs gas producing medicinal that build-up pressure is lighted a fire in the combustion chamber rapidly, its ignition characteristic is poor.
4, prior art adopts nitro-cotton to make binding agent, and bad, easy thermolysis when temperature is high of strong not, the long storage stability of nitro-cotton cohesiveness, when temperature was low, its colloidal sol was the ball attitude, ganged up to be difficult for disperseing, and made wet mixing and granulation very difficult.
Summary of the invention
The object of the present invention is to provide a kind of ignition characteristic good, stable processing technique, production process safety, production efficiency height and starting material require simple igniter for gas generator of safety gasbag.
Another object of the present invention is to provide the preparation method of this starting mix agent.
In order to realize the object of the invention, the invention provides a kind of igniter for gas generator of safety gasbag, its component by following weight percentage forms:
The nitrate 55～80% of basic metal or alkaline-earth metal;
Boron powder 17～43%;
The second reductive agent 1～5%;
Water-soluble binder 1～4%;
Guanidine class, azole or amine that described the second reductive agent is rich nitrogen.
The nitrate of basic metal of the present invention or alkaline-earth metal is saltpetre, SODIUMNITRATE, strontium nitrate.Preferred saltpetre, it can adopt industrial potassium nitrate, purity greater than 99% just can, granularity does not require.
The used boron powder of the present invention is amorphous boron powder, is a kind of black or brown amorphous powder, and fusing point is 2167 ℃, and boiling point is 3680 ℃, and chemical property is more active, and is stable under air and normal temperature, oxidized when being heated to 300 ℃, reaches 700 ℃ and namely catches fire.Amorphous boron powder particle diameter as reductive agent less (D50≤2.0 μ m), activity is higher.
Guanidine class, azole or the amine of rich nitrogen of the present invention can increase gas production rate and the specific volume of starting mix as the second reductive agent, have improved its ignition ability to the gas generating powder of under high pressure stable burning of needs.Such as Guanidinium nitrate, 5-amino tetrazole, Dyhard RU 100, Guanidinium carbonate, amino-guanidine nitrate, diamino Guanidinium nitrate, triamino Guanidinium nitrate or nitric acid nitre ammonia guanidine etc.First-selected Guanidinium nitrate, granularity requirements is thinner, median size≤10 μ m.
In order to reduce starting mix agent danger classes, minimizing material cost in process of production, binding agent of the present invention adopts water-soluble binder, and first-selected carboxymethyl cellulose also can adopt cellulose sodium carboxymethyl, Walocel MT 20.000PV or guar gum etc.
Starting mix agent of the present invention can be prepared as follows:
1) first the nitrate of basic metal or alkaline-earth metal is dissolved in the water, then under agitation adds guanidine class, azole or the amine of boron powder and rich nitrogen, make uniform suspension;
2) then suspension is carried out spraying drying after, mix with water-soluble binder;
3) carrying out at last forming process forms.
The compound concentration of nitrate unsaturated solution is advisable with 10～40%, and preferred saltpetre can as shown in Figure 3, guarantee that all saltpetre is dissolved in the water fully with reference to the saltpetre solubility curve when preparation, must not have potassium nitrate crystals to separate out.Solvent among the present invention uses deionized water.
Dry mixed is adopted in described mixing, usually selects the paper drum or carries out in the blender of having taked measures for the prevention of explosion.When in blender, being dry mixed, being dry mixed about 15 minutes time and just can satisfying processing requirement.
Be dry mixed the mixture that obtains except can directly carrying out the compression molding with rotary tablet machine, its moulding also has two kinds of techniques, and a kind of is to be interrupted production technique, and a kind of is continuous production processes.
Between breaking process be will be dry mixed to add its total mass 13～25% deionized waters in the mixture, mediate 0.5 hour with kneader after, add the sliding cylinder extrusion machine and carry out extrusion.Medicinal strip can carry out pelletizing when drying in the air moisture content 5～8%, as shown in Figure 1.
Continuous production processes then is directly to add in the twin screw extruder and add simultaneously 13～20% deionized water and mix and extrude and pelletizing being dry mixed the mixture that obtains, as shown in Figure 2.
Through the contriver lot of experiments, oxygenant has adopted such as the basic metal of saltpetre etc. or the nitrate of alkaline-earth metal in starting mix agent of the present invention, and reductive agent adopts the boron powder.Also the present invention has increased by the second reductive agent in starting mix simultaneously, and adopts water-soluble binder as binding agent.
Starting mix agent of the present invention has simply, safety, low production cost, the comprehensive good characteristics of ignition characteristic.Starting mix agent of the present invention is carried out performance test at encloses container, and its average peak pressure of 3g starting mix is greater than the nitro-cotton prescription that adopts traditional granulation process.And to the starting mix of corresponding time of peaking less than the nitro-cotton prescription of traditional granulation process.Production efficiency of the present invention is again the decades of times of traditional technology, and material cost is because substitute nitro-cotton and reduce with water-soluble binder, and has increased the stability of standing storage.
Description of drawings
Fig. 1 is the interruption process flow sheet of igniter for gas generator of safety gasbag of the present invention;
Fig. 2 is the continuous processing schema of igniter for gas generator of safety gasbag of the present invention;
Fig. 3 is the solubility curve of saltpetre of the present invention.
Embodiment
The below further describes the present invention with embodiment, is conducive to the understanding to the present invention and advantage thereof, better effects if, but described embodiment only is used for explanation the present invention rather than restriction the present invention.
Embodiment 1
6.8 kilograms of saltpetre fully are dissolved in the 40L water, while stir 2.6 kilograms of boron powder (D50 is 1.3 μ m) and 0.3 kilogram of Guanidinium nitrate (D50 is 9.3 μ m) are poured in the saltpetre unsaturated solution that has just prepared, make uniform suspension.
Carry out suspension after the spraying drying and 0.3 kilogram carboxymethyl cellulose is dry mixed 30 minutes in mixing machine.Pour the material after being dry mixed in kneader adding 1.2Kg deionized water kneading discharging after 1 hour, the interior temperature of chuck is controlled at 20-35 ℃ during kneading.Kneaded wet feed is put into the medicinal strip that plunger-type extruder is extruded into diameter 3mm, and medicinal strip hangs about 5 hours and carries out pelletizing with dicing machine, and pelletizing length is 2.5mm.Powder is tiled in the pallet, and 100 ℃ of oven dry just get finished product.
Through three detections, its performance is as follows:
Comparative Examples
7.2 kilogram saltpetre (325 order screen underflow) and 2.4 kilograms of boron powder (D50 is 1.3 μ m) are dry mixed evenly.0.4 the kilogram nitro-cotton is made even glue with the 35L acetone solution, carries out wet mixing with above-mentioned mixed siccative, carries out 20 mesh standard sieve granulations after mixing, after 40 mesh sieves, the screen overflow oven dry gets product.
Through three detections, its performance is as follows:
Conclusion: the dark effect of closing of traditional mechanical dry is bad, and production security is poor, wet mixing and the granulation effort of taking a lot of work, and production efficiency is low.From test result, starting mix agent peak pressure of the present invention is greater than conventional formulation, and to the starting mix of corresponding time of peaking less than conventional formulation.Production efficiency of the present invention is again the decades of times of traditional technology, and material cost is because substitute nitro-cotton and reduce with water-soluble binder, and has increased the stability of standing storage.
Embodiment 2
7.0 kilograms of saltpetre and 0.3 kilogram of Guanidinium nitrate fully are dissolved in the 42L water, while stir 2.4 kilograms of boron powder (D50 is 1.3 μ m) are poured in the unsaturated solution of the saltpetre that just prepared and Guanidinium nitrate, make uniform suspension.
Suspension is carried out the uniform mixture that spraying drying obtains saltpetre, boron powder, Guanidinium nitrate.After this mixture and 0.3 kilogram of Walocel MT 20.000PV be dry mixed 15 minutes, add the 1.3Kg deionized water and in same equipment, carry out wet mixing.
Mixture joins by feeding equipment in the continuous extrusion equipment of twin screw of pyrotechnic composition special use and extrudes and pelletizing.
Extrusion equipment mouth nib is directly used Φ 3.5mm, pelletizing length 2.2mm.With the baking of 50 ℃ of powders after 5 hours, 100 ℃ dry by the fire to volatile content be lower than 0.4% finished product.
After testing, its performance is as follows:
Embodiment 3
5.2 kilograms of SODIUMNITRATE fully are dissolved in the 40L water, while stirring 4.3 kilograms of boron powder (D50 is 1.3 μ m) and 0.5 kilogram of 5-amino tetrazole (D50 is 20 μ m) are poured in the SODIUMNITRATE unsaturated solution that has just prepared, made uniform suspension.
Carry out suspension after the spraying drying and 0.2 kilogram Walocel MT 20.000PV is dry mixed 30 minutes in mixing machine.Pour the material after being dry mixed in kneader adding 1.2Kg deionized water kneading discharging after 1 hour, the interior temperature of chuck is controlled at 20-35 ℃ during kneading.Kneaded wet feed is put into the medicinal strip that plunger-type extruder is extruded into diameter 3mm, and medicinal strip hangs about 5 hours and carries out pelletizing with dicing machine, and pelletizing length is 2.5mm.Powder is tiled in the pallet, and 100 ℃ of oven dry just get finished product.
After testing, its performance is as follows:
Embodiment 4
8.0 kilograms of strontium nitrates fully are dissolved in the 40L water, while stir 1.7 kilograms of boron powder (D50 is 1.3 μ m) and 0.2 kilogram of Guanidinium nitrate (D50 is 9.3 μ m) are poured in the saltpetre unsaturated solution that has just prepared, make uniform suspension.
Carry out suspension after the spraying drying and 0.1 kilogram carboxymethyl cellulose is dry mixed 30 minutes in mixing machine.Pour the material after being dry mixed in kneader adding 1.2Kg deionized water kneading discharging after 1 hour, the interior temperature of chuck is controlled at 20-35 ℃ during kneading.Kneaded wet feed is put into the medicinal strip that plunger-type extruder is extruded into diameter 3mm, and medicinal strip hangs about 5 hours and carries out pelletizing with dicing machine, and pelletizing length is 2.5mm.Powder is tiled in the pallet, and 100 ℃ of oven dry just get finished product.
After testing, its performance is as follows:
The above is preferred embodiment of the present invention only, is not to limit scope of the invention process.So all doing according to the described feature of the present patent application scope and spirit all is equivalent variations or modification, all should be included within the claim of the present invention.
Claims (8)
1. igniter for gas generator of safety gasbag is characterized in that, its component by following weight percentage forms:
The nitrate 55 ~ 80% of basic metal or alkaline-earth metal;
Boron powder 17 ~ 43%;
The second reductive agent 1 ~ 5%;
Water-soluble binder 1 ~ 4%;
Guanidine class, azole or amine that described the second reductive agent is rich nitrogen, described boron powder median size 1.3 ~ 2.0 μ m, described boron powder is amorphous boron powder, the guanidine class of described rich nitrogen is Guanidinium nitrate, median size≤10 μ m.
2. starting mix agent according to claim 1 is characterized in that, the nitrate of described basic metal or alkaline-earth metal is saltpetre, SODIUMNITRATE or strontium nitrate.
3. starting mix agent according to claim 1 and 2 is characterized in that, described nitrate is saltpetre.
?
4. starting mix agent according to claim 1 and 2 is characterized in that, the azole of described rich nitrogen or amine are 5-amino tetrazole, Dyhard RU 100.
5. starting mix agent according to claim 1 and 2 is characterized in that, described water-soluble binder is carboxymethyl cellulose, cellulose sodium carboxymethyl, Walocel MT 20.000PV or guar gum.
6. prepare the method for the described starting mix agent of claim 1-5 any one, it is characterized in that, comprise the steps:
1) first the nitrate of basic metal or alkaline-earth metal is dissolved in the water, then under agitation adds boron powder, and guanidine class, azole or the amine of rich nitrogen, make uniform suspension;
2) then suspension is carried out spraying drying after, mix with water-soluble binder;
3) carrying out at last forming process forms.
?
7. the preparation method of described starting mix agent according to claim 6 is characterized in that described nitrate solution concentration is 20 ~ 40%.
?
8. according to claim 6 or the preparation method of 7 described starting mix agent, it is characterized in that forming process adopts compression molding, is interrupted pelletizing moulding or continuously pelletizing moulding.
?
?
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010619218 CN102173973B (en) | 2010-12-31 | 2010-12-31 | Igniter for gas generator of safety gasbag and preparation method thereof |
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| CN 201010619218 CN102173973B (en) | 2010-12-31 | 2010-12-31 | Igniter for gas generator of safety gasbag and preparation method thereof |
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| CN102173973A CN102173973A (en) | 2011-09-07 |
| CN102173973B true CN102173973B (en) | 2013-01-30 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114988974A (en) * | 2014-06-05 | 2022-09-02 | Tk控股公司 | Improved pressurized compositions |
| CN106699490A (en) * | 2016-01-25 | 2017-05-24 | 湖北航天化学技术研究所 | Safety airbag igniting powder composition and preparation method of safety airbag igniting powder composition |
| CN108456126B (en) * | 2017-02-20 | 2020-02-21 | 比亚迪股份有限公司 | Transfer powder of gas generator, preparation method of transfer powder and gas generator for automobile safety airbag |
| CN111875460A (en) * | 2018-09-26 | 2020-11-03 | 西安航科等离子体科技有限公司 | Pyrotechnic agent containing potassium nitrate salt and preparation method thereof |
| CN110734353A (en) * | 2019-10-24 | 2020-01-31 | 龚继海 | gas generating agent for gas type superfine dry powder fire extinguishing system and preparation method thereof |
| CN114436723A (en) * | 2022-01-07 | 2022-05-06 | 中国人民解放军国防科技大学 | Safe gunpowder and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6132480A (en) * | 1999-04-22 | 2000-10-17 | Autoliv Asp, Inc. | Gas forming igniter composition for a gas generant |
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| US20060289096A1 (en) * | 2003-07-25 | 2006-12-28 | Mendenhall Ivan V | Extrudable gas generant |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6132480A (en) * | 1999-04-22 | 2000-10-17 | Autoliv Asp, Inc. | Gas forming igniter composition for a gas generant |
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Owner name: EAST JOY LONG MOTOR AIRBAG CO., LTD. Free format text: FORMER OWNER: SHANGHAI EAST JOYLONG AUTOMOBILE SAFE SACCUS CO., LTD. Effective date: 20141201 |
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Effective date of registration: 20141201 Address after: 050700 No. 132 South Ring Road, Shijiazhuang, Hebei, Xinle Patentee after: East Joy Long Motor Airbag Co., Ltd. Address before: 201201 Shanghai city Pudong New Area Qing Road No. 219 Patentee before: Shanghai East Joylong Automobile Safe Saccus Co., Ltd. |
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Owner name: HEBEI EAST JOY LONG RUIFENG AUTOMOTIVE SECURITY PA Free format text: FORMER OWNER: EAST JOY LONG MOTOR AIRBAG CO., LTD. Effective date: 20150820 |
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Effective date of registration: 20150820 Address after: 050300 small town of Jingxing County, Hebei City, Shijiazhuang Province Patentee after: Hebei Dongfang Ruifeng automobile safety component Co., Ltd. Address before: 050700 No. 132 South Ring Road, Shijiazhuang, Hebei, Xinle Patentee before: East Joy Long Motor Airbag Co., Ltd. |