EP1054849B1 - Frühzündpulver für thermische sicherungen für airbag-gasgeneratoren - Google Patents
Frühzündpulver für thermische sicherungen für airbag-gasgeneratoren Download PDFInfo
- Publication number
- EP1054849B1 EP1054849B1 EP99913070A EP99913070A EP1054849B1 EP 1054849 B1 EP1054849 B1 EP 1054849B1 EP 99913070 A EP99913070 A EP 99913070A EP 99913070 A EP99913070 A EP 99913070A EP 1054849 B1 EP1054849 B1 EP 1054849B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- kclo
- ignition powder
- powder according
- weight
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
- C06C9/00—Chemical contact igniters; Chemical lighters
Definitions
- the present invention relates to pre-ignition powder for thermal fuses currentless ignition of the gas set of an airbag gas generator of motor vehicles
- the gas sets used in automotive airbag gas generators are typically very stable thermally.
- To the gas set at high ambient temperature e.g. in case of a Igniting vehicle fires in a controlled manner are so-called thermal fuses used.
- the thermal fuse ensures that the finished gas generator before and after installation, e.g. in the motor vehicle not only at an uncontrollably high level Temperature is ignited and it may then lead to a leak or even to Fragmentation of the gas generator housing - especially with an aluminum housing - come Accordingly, the thermal fuse ensures that the implementation of the gas-generating mixture thermally triggered far below this critical temperature becomes. In such a case, they are prevented by their early implementation and controlled ignition of the gas set, the destruction of the gas generator housing and avoids the associated dangers
- a possible embodiment for a thermal fuse includes a container, that with a pre-ignition powder, for example in granular form (pyrotechnic mixture) is filled (0.1 to 0.5 g), which is preferably between 150 ° C. and 200 ° C ignites itself and releases so much heat that the ignition of the actual lighter and / or the gas set is guaranteed.
- a pre-ignition powder for example in granular form (pyrotechnic mixture) is filled (0.1 to 0.5 g), which is preferably between 150 ° C. and 200 ° C ignites itself and releases so much heat that the ignition of the actual lighter and / or the gas set is guaranteed.
- Pyrotechnic airbag gas generators are usually used in the event of a vehicle crash ignited by a current pulse by means of a sensor Ignition charge intensified, which with the hot gas and solid particles generated actual gas set - often in tablet form - burns almost synchronously.
- the burning one Gas set supplies the filling gas of the protective cushion.
- the autoignition temperature currently Common gas sets are around 400 ° C for the azide-containing ones and for the azide-free ones Gas rates still at around 300 ° C.
- nitrocellulose powders have been used as pre-ignition powder used for thermal fuses. These have a self-ignition temperature (Decomposition point) from 150-200 ° C.
- the nitrocellulose powders are not enough Stability requirements that have recently been required by the automotive industry Thereafter, thermal fuses of hot storage must be kept at 107 ° C for 400 hours (224 ° Fahrenheit; U.S. Patent 5,460,671, column 3) with a weight loss ⁇ 3% and below Withstand full functionality.
- nitrocellulose tends to become decomposes slowly even at low temperatures and therefore does not guarantee that Functionality as pre-ignition powder over a longer period of time, like this at Motor vehicles, however, is required
- thermal fuses which are said to be able to the gas-generating mixtures commonly used in gas generators are widely used ignite thermally controlled below the critical temperature, and not the Disadvantages of nitrocellulose have as substances or as mixtures of these Thermal fuses can use connections that are selected from the compound classes of oxalates, peroxodisulfates (persulfates), permanganates, nitrides, Perborates, bismuthates, formates, nitrates, sulfamates, bromates or peroxides.
- oxalates peroxodisulfates (persulfates), permanganates, nitrides, Perborates, bismuthates, formates, nitrates, sulfamates, bromates or peroxides.
- oxidizable components such as explosives with low deflagration or decomposition points, preferably calcium bistetrazolamine, 3-nitro-1,2,4-triazol-5-one (NTO), 5-aminotetrazole nitrate, nitroguanidine (NIGU), Guanidine nitrate or bistrazolamine can be used.
- the substances although one lower deflagration point or decomposition point than the gas generator used Having a mixture, but decomposing endothermically, require at least one Fuel and possibly a reducing agent to be used as a thermal fuse to be able to. Examples of fuels are those given above called oxidizable components.
- Metal powder for example, can be used as the reducing agent. titanium powder are preferably used.
- To influence the deflagration points can include oxidizing agents such as potassium nitrate or potassium perchlorate or Mixtures of these oxidizing agents are added.
- US Pat. No. 5,460,671 describes ignition powder which consists of a mixture of a fuel and an oxidizing agent.
- the oxidizing agents are selected from the group consisting of alkali metal or alkaline earth metal chlorates or mixtures thereof. especially potassium or sodium chlorate are examples of the fuels Carbohydrates such as D-glucose, D-galactose, D-ribose, etc.
- the present invention has for its object to provide pre-ignition powder, the do not have the disadvantages of nitrocellulose described above and the Stability requirements mentioned above (i.e. weight loss ⁇ 3% at warm storage at 107 ° C for 400 hours) and overheating of the gas generator (at temperatures above 240 ° C) with a small amount (0.1 to 0.5g) Early ignition powder (in the early ignition unit) can ignite the airbag gas set.
- the fuel (A) is in the early ignition powders according to the invention for thermal Fuses in an amount of 20 to 40 parts by weight, preferably 25-35 parts by weight and especially 28-32 parts by weight before
- the oxidizing agents (B) preferably Potassium chlorate and potassium nitrate, potassium chlorate and potassium perchlorate as well as mixtures of these three oxidizing agents are preferably in an amount of 40-80 parts by weight 50-75 parts by weight and in particular 60-75 parts by weight.
- the stabilizers (C) is hydroxyethyl cellulose (Natrosol 250 HR from Aqualon) and Cellulose acetobutyrate is particularly preferred.
- the polyamides are stabilizers (C) in addition to conventional polyamides according to the invention amide derivatives such as dicyandiamide (Cyanoguanidine) to count
- the stabilizers are in a proportion of 0.5-20 Parts by weight, preferably 0.5-10 parts by weight and in particular 0.5-5 parts by weight
- the pre-ignition powders according to the invention can optionally Processing aids (D) in an amount of 0.5-5 parts by weight, preferably 0.5 to 3 Parts by weight included.
- auxiliary fuels (E) can optionally be added in one Amount of 0.5-20 parts by weight, preferably 0.5-10 parts by weight and in particular 0.5-5 Parts by weight are available.
- fillers (F) can optionally be combined in one Proportion of 0.5-12 parts by weight, preferably 0.5-10 parts by weight and in particular 0.5-5 Parts by weight are available.
- the pre-ignition powder for thermal fuses according to the invention are not only for that Airbag area limited, but can also trigger mechanical Movements and in pressure and security elements are used,
- the toxicities of those used for the thermal fuses according to the invention correspond to the Swiss poison class 3, 4 and 5 Reaction products of these mixtures is due to the previous raw material balance and low use does not endanger or harm humans / vehicle occupants fear.
- the unused mixes are good too with conventional means dispose of or recycle.
- the thermal fuses according to the invention are with others gas generating mixtures or pyrotechnic phrases, e.g. Boron / potassium nitrate good compatible and can be added as granules or tablets or in preferably made of aluminum (or steel) container.
- the Purity and the grain size of these raw materials as well as the various used Mixtures of the oxidizing agents and fuels influence the Decomposition temperature and type.
- the type of stabilizer and its mixing proportion affects the Long-term stability and trigger temperature.
- Thiourea in the new combination with the oxidizing agents mentioned above (B) and the appropriate stabilizers (C) (protective colloids) represent systems that between 150-200 ° C suddenly react strongly exothermic, but on the other hand storage 400 hours at 107 ° C with a weight loss of ⁇ 3% while maintaining full functionality can survive.
- chlorates as an oxidizing agent (B)
- Nitrates and / or perchlorates are the trigger temperature of the chemical fuse be moved (see Examples 3 and 5, Table I).
- auxiliary fuels such as metal powders of aluminum, zirconium, titanium, magnesium, zinc, iron, etc.
- the production of hot particles can be positively influenced.
- Another possibility for producing hot particles - but at the expense of the total energy of the thermal Security mixes are made - by adding fillers such as Al 2 O 3 , TiO 2 , ZrO 2 , Fe 2 O 3 , Si 3 N 4 , boron nitride, etc.
- processing aids (D) such as graphite and stearates (especially calcium) and magnesium stearate) or high-boiling paraffins (usually) the trigger temperature rises.
- the thermal behavior was determined by means of differential scanning calorimetry (DSC method) of the various examples both before storage and after 400 hours at 107 ° C.
- example 1 (Comparison) parts by weight 2 parts by weight 3 parts by weight 4 parts by weight 5 parts by weight KClO 3 70.0 70.0 44.0 70.0 44.0 KNO 3 0 0 26.0 0 26.0 thiourea 30.0 30.0 30.0 30.0 30.0 30.0 Hydroxyethyl cellulose (Natrosol 250 HR from Aqualon) 0 3.0 3.0 1.5 1.5 Weight loss after h at 107 ° C in% after 216h > 3% after 400h 2.3% after 400h 1.3% after 400h 2.2% after 400h 1.5% Reaction peak in DSC analysis; Heating rate 10 ° C / min Before exam 170 ° C Before exam 172 ° C Before exam 197 ° C Before exam 177 ° C Before exam 198 ° C After exam - After exam 172 ° C After exam 190 ° C After exam 168
- the ignition powders according to the invention according to Examples 2-5 and 7-10 showed after 400 Hours at 107 ° C a change in the decomposition temperature between 0 and 12 ° C Decomposition point was determined using differential scanning calorimetry (DSC method) certainly.
- the range in the decomposition temperature determination was at used heating rate of 10 ° C / min ⁇ 5 ° C.
- Example 6 is carried out in accordance with Examples 1-5, instead of thiourea N, N'-diphenylthiourea used.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Air Bags (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Description
Beispiel | 1 (Vergleich) Gewichtsteile | 2 Gewichtsteile | 3 Gewichtsteile | 4 Gewichtsteile | 5 Gewichtsteile |
KClO3 | 70.0 | 70,0 | 44,0 | 70,0 | 44,0 |
KNO3 | 0 | 0 | 26,0 | 0 | 26,0 |
Thioharnstoff | 30,0 | 30,0 | 30,0 | 30,0 | 30,0 |
Hydroxyethyl cellulose (Natrosol 250 HR der Fa. Aqualon) | 0 | 3,0 | 3,0 | 1,5 | 1,5 |
Gewichtsverlust nach h bei 107°C in % | nach 216h >3% | nach 400h 2,3% | nach 400h 1,3% | nach 400h 2,2% | nach 400h 1,5% |
Reaktionspeak bei DSC-Analyse; Aufheizrate 10°C/min | Vor Prüfung 170°C | Vor Prüfung 172°C | Vor Prüfung 197°C | Vor Prüfung 177°C | Vor Prüfung 198°C |
Nach Prüfung - | Nach Prüfung 172°C | Nach Prüfung 190°C | Nach Prüfung 168°C | Nach Prüfung 186°C |
Claims (12)
- Frühzündpulver für eine thermische Sicherung, umfassend(A) mindestens einen Brennstoff ausgewählt aus der Gruppe bestehend aus Thioharnstoff und seinen Derivaten,(B) mindestens ein Oxidationsmittel ausgewählt aus NaNO3, KNO3, Sr(NO3)2, NaClO3, KClO3, Sr(ClO3)2, NaClO4. KClO4, Sr(ClO4)2,(C) mindestens einen Stabilisator ausgewählt aus der Gruppe bestehend aus Celluslosederivaten, wie Celluloseether und Celluloseester, Polystyrol und Polystyrol-Copolymeren, Polyamiden, Polyacrylaten, Polycarbonaten, Polypropylenen, Polybutylenen, Polyoxymethylenen, Polyacetaten und Polyvinyl-Verbindungen.
- Frühzündpulver nach Anspruch 1, wobei das Oxidationsmittel (B) ausgewählt ist aus einem Gemisch von KClO3 und KNO3, KClO3 und KClO4, und KClO3, KNO3 und KClO4
- Frühzündpulver nach Anspruch 1 oder 2, wobei der Stabilisator (C) ausgewählt ist aus Hydroxyethylcellulose, Celluloseacetobutyrat und Dicyandiamid und deren Gemischen.
- Frühzundpulver nach Anspruch 1, wobei der Brennstoff (A) Thioharnstoff ist, das Oxidationsmittel (B) KNO3 und/oder KClO3 ist, und der Stabilisator (C) Hydroxyethylcellulose ist.
- Frühzündpulver nach Anspruch 1, wobei der Brennstoff (A) Thioharnstoff ist, das Oxidationsmittel (B) ein Gemisch von KClO3 und KNO3 und/oder KClO4 ist, und der Stabilisator (C) ausgewählt ist aus Hydroxyethylcellulose, Celluloseacetobutyrat und Dicyandiamid oder deren Gemischen.
- Frühzündpulver nach einem der Ansprüche 1-5 des weiteren umfassend:(D) Verarbeitungshilfsmittel ausgewählt aus Calcium- und Magnesiumstearaten, Graphit, hochsiedenden Paraffinen und Citronensäureester und Acylcitronensäureester in einer Menge von 0,5-5 und bevorzugt 0,5-3 Gewichtsteilen.
- Frühzündpulver nach einem der Ansprüche 1-6 des weiteren umfassend(E) Hilfsbrennstoffe, ausgewählt aus elementarem Aluminium, Zirconium, Titan, Magnesium, Zink und Eisen in einer Menge von 0,5-20, bevorzugt 0,5-10 und insbesondere 0,5-5 Gewichtsteilen.
- Frühzündpulver nach einem der Ansprüche 1-7, des weiteren umfassend:(F) Füllstoffe, ausgewählt aus der Gruppe von Al2O3, TiO2, ZrO2, Fe2O3, Si3N4 und Bornitrid in einer Menge von 0,5-12, bevorzugt 0,5-10 und insbesondere 0,5-5 Gewichtsteilen.
- Frühzündpulver nach einem der Ansprüche 1-8, wobei der Brennstoff (A) in einer Menge von 20-40, bevorzugt 25-35 und insbesondere 28-32 Gewichtsteilen vorliegt
- Frühzündpulver nach einem der Ansprüche 1-9, wobei das Oxidationsmittel (B) in einer Menge von 40-80, vorzugsweise 50-75 und insbesondere 60-75 Gewichtsteilen vorliegt
- Frühzündpulver nach einem der Ansprüche 1-10, wobei der Stabilisator (C) in einer Menge von 0,5-20, bevorzugt 0,5-10 und insbesondere 0,5-5 Gewichtsteilen vorliegt.
- Verwendung eines Frühzündpulvers nach einem der Ansprüche 1 bis 11 für thermische Sicherungen für Airbag-Gasgeneratoren
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19805976A DE19805976C1 (de) | 1998-02-13 | 1998-02-13 | Frühzündpulver für thermische Sicherungen für Airbag-Gasgeneratoren |
DE19805976 | 1998-02-13 | ||
PCT/DE1999/000414 WO1999041213A1 (de) | 1998-02-13 | 1999-02-11 | Frühzündpulver für thermische sicherungen für airbag-gasgeneratoren |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1054849A1 EP1054849A1 (de) | 2000-11-29 |
EP1054849B1 true EP1054849B1 (de) | 2002-05-02 |
Family
ID=7857656
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99913070A Expired - Lifetime EP1054849B1 (de) | 1998-02-13 | 1999-02-11 | Frühzündpulver für thermische sicherungen für airbag-gasgeneratoren |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1054849B1 (de) |
JP (1) | JP2002503624A (de) |
KR (1) | KR20010040741A (de) |
AT (1) | ATE216985T1 (de) |
AU (1) | AU3136699A (de) |
CZ (1) | CZ292350B6 (de) |
DE (2) | DE19805976C1 (de) |
WO (1) | WO1999041213A1 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001090032A1 (de) * | 2000-05-26 | 2001-11-29 | Nigu Chemie Gmbh | Frühzündpulver für thermische sicherungen für airbag-gasgeneratoren |
DE20010154U1 (de) * | 2000-06-07 | 2000-09-07 | TRW Airbag Systems GmbH & Co. KG, 84544 Aschau | Anzündmischung zur Verwendung in Gasgeneratoren |
DE202004014775U1 (de) * | 2004-09-22 | 2005-02-10 | Trw Airbag Systems Gmbh | Gasgenerator |
DE102004062168A1 (de) * | 2004-10-08 | 2006-04-13 | Petri-Dn Gmbh Inflator Systems | Stoffgemisch als thermisch initiierbare Anzündmischung |
CN100455553C (zh) * | 2004-10-08 | 2009-01-28 | 彼得里-蒂恩充气系统两合公司 | 作为可热引发的引燃混合物的物质混合物 |
DE102004057770B4 (de) * | 2004-11-30 | 2008-07-31 | Trw Airbag Systems Gmbh | Pyrotechnische Zusammensetzung zur Verwendung als Frühzündmittel |
FR2883868B1 (fr) * | 2005-03-30 | 2007-08-03 | Davey Bickford Snc | Compositions auto-initiatrices, initiateurs electriques utilisant de telles compositions et generateurs de gaz comportant de tels initiateurs |
GB0722384D0 (en) * | 2007-11-15 | 2007-12-27 | Green Benjamin J | Pyrotechnic target |
DE102008025218B3 (de) * | 2008-05-27 | 2009-11-12 | Bayern-Chemie Gesellschaft Für Flugchemische Antriebe Mbh | Initiator |
FR2945288B1 (fr) * | 2009-05-05 | 2011-07-22 | Snpe Materiaux Energetiques | Compose solide pyrotechnique, obtention par voie seche et utilisation |
DE102015014428A1 (de) | 2014-11-10 | 2016-05-12 | Ruag Ammotec Gmbh | Thermische Frühzündmittel |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3929530A (en) * | 1966-11-21 | 1975-12-30 | Dow Chemical Co | Pyrotechnic disseminating formulation |
GB1290418A (de) * | 1969-12-26 | 1972-09-27 | ||
US3695948A (en) * | 1970-05-22 | 1972-10-03 | Dow Chemical Co | Cast explosive composition containing thiourea |
WO1994001382A1 (en) * | 1992-07-10 | 1994-01-20 | Nippon Kayaku Kabushiki Kaisha | Gas generating agent and gas generator for automotive airbag |
EP0706505B1 (de) * | 1994-04-04 | 2005-11-16 | Automotive Systems Laboratory Inc. | Gasgeneratorselbstsentzündung mit einer chloratzusammensetzung |
DE19505568A1 (de) * | 1995-02-18 | 1996-08-22 | Dynamit Nobel Ag | Gaserzeugende Mischungen |
DE19616627A1 (de) * | 1996-04-26 | 1997-11-06 | Dynamit Nobel Ag | Anzündmischungen |
EP0914305B2 (de) * | 1996-07-20 | 2007-04-04 | Dynamit Nobel GmbH Explosivstoff- und Systemtechnik | Thermische sicherung |
-
1998
- 1998-02-13 DE DE19805976A patent/DE19805976C1/de not_active Expired - Fee Related
-
1999
- 1999-02-11 AU AU31366/99A patent/AU3136699A/en not_active Abandoned
- 1999-02-11 CZ CZ20002897A patent/CZ292350B6/cs not_active IP Right Cessation
- 1999-02-11 AT AT99913070T patent/ATE216985T1/de not_active IP Right Cessation
- 1999-02-11 JP JP2000531413A patent/JP2002503624A/ja active Pending
- 1999-02-11 WO PCT/DE1999/000414 patent/WO1999041213A1/de active IP Right Grant
- 1999-02-11 DE DE59901347T patent/DE59901347D1/de not_active Expired - Fee Related
- 1999-02-11 EP EP99913070A patent/EP1054849B1/de not_active Expired - Lifetime
- 1999-02-11 KR KR1020007008625A patent/KR20010040741A/ko active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
CZ20002897A3 (cs) | 2001-02-14 |
WO1999041213A1 (de) | 1999-08-19 |
CZ292350B6 (cs) | 2003-09-17 |
EP1054849A1 (de) | 2000-11-29 |
DE19805976C1 (de) | 1999-04-29 |
DE59901347D1 (de) | 2002-06-06 |
JP2002503624A (ja) | 2002-02-05 |
KR20010040741A (ko) | 2001-05-15 |
AU3136699A (en) | 1999-08-30 |
ATE216985T1 (de) | 2002-05-15 |
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