KR101212790B1 - Composition for gas generating agent, gas generating agent using the same and inflator comprising the gas generating agent - Google Patents

Abstract

The present invention relates to a gas generator composition, a gas generator using the same and an inflator comprising the same, more specifically, the main oxidizing agent having a mean particle size of 5 to 15㎛, the main fuel, fuel for increasing combustion rate and average particle size of 0.1 It relates to a gas generator composition containing a mixed catalyst of 1 to 1㎛, a gas generator using the same and an inflator comprising the same. According to the present invention, the oxygen balance is -2 to -3%, the heat of combustion is 700kcal / kg or less, the combustion temperature is 2300K or less, the gas generation amount is 30moles / kg or more, the content of H ₂ O in the generated gas is 49% by volume Hereinafter, a gas generator composition and a gas generator using the same, wherein the N ₂ content is 30 vol% or more, the combustion rate is 1000 mm / sec or more, and the combustion rate index is 0.5 or less.

Description

Composition for gas generating agent, gas generating agent using the same and inflator comprising the same {COMPOSITION FOR GAS GENERATING AGENT, GAS GENERATING AGENT USING THE SAME AND INFLATOR COMPRISING THE GAS GENERATING AGENT}

The present invention relates to a gas generator composition, a gas generator using the same and an inflator comprising the same.

The SRS Airbag, a supplementary restraining system that mitigates the impact of a passenger in a car crash, is a representative passenger protection device along with a seat belt. Automotive airbag systems began to be developed in the middle of the 20th century.In North America, driver seat airbags were mandated in 1997, and advanced airbags, Duel, in 2003, and side airbags in 2013. Will also be mandatory

The initial system of the airbag used a large amount of compressed gas to inflate the cushion control bag and was operated by a collision sensor to release the gas and inflate the airbag to mitigate the passenger's shock. Such compressed gas storage systems are bulky and heavy, have slow reaction times and poor long-term storage. And because of the difficult management accompanying it has been replaced by an airbag system using a gas generated from a chemical gas composition, that is, a gas generator.

The initial composition of the gas generator was a composition mainly containing metal azide such as sodium azide. The azide-based gas generator containing the metal azide generates a large amount of nitrogen gas that is not harmful to the body, and can produce an inflator that is a gas generator using light aluminum because of its low combustion temperature and fast combustion speed. there was.

However, the metal azide has a big disadvantage of being toxic. That is, azide is easily hydrated and decomposed to produce hydrazoic acid. The hydrazoic acid not only shows high toxicity but also easily reacts with heavy metals such as copper or lead to make a sensitive compound. Therefore, azide-containing gas generators need careful management from manufacture to storage and final disposal.

The azide-based gas generators are described in US Patent 3814694 (74.6.4), US Patent 3904221 (75.9.9), US Patent 3931040 (76.1.6), US Patent 4021275 (77.5. 3), US Patent 4179327 (79.12.18), US Patent 4339288 (82.7.13), US Patent 4533416 (85.8.6), US Patent 4696705 (86.12.2), US Patent 4758287 (88.7.19), US Patent 4834818 (89.5.30), US Patent 4976795 (90.12.11), US Patent 5034070 (91.7.23), US Patent 5074940 (91.12.24), US Patent 5387296 (95.2.7) and the like.

The patent discloses metal azide of alkali or alkaline earth metal as main fuel, combustible materials such as organic nitrates, organic nitrite compounds, metal organic compounds, carbon graphite and metal powder as auxiliary fuels, metal sulfur compounds and metal iodides as oxidizing agents. Logistics, oxidizing materials such as metal oxides, nitrates, chlorates, perchlorates, peroxides, chlorides, nitrides, sulfur and metal hydroxides, and carbonates and oxamides as coolants, and silica and dioxide Inert materials such as silicon, clay, bentonite and titania, and other materials include binders, lubricants, water repellents, molybdenum disulfide and silane, and the like.

However, due to the toxicity problem, since the late 1990s, azide-based gas generators have been used as gas generators in inflators for inflating airbags.

U.S. Pat. insoluble salts of oxalic acid copper organic acid copper salt _{(Cupric oxalate, 2CuC 2 O 4} ? H 2 O), citric acid, copper salt _{(Cupric citrate, 2Cu 2 C 6} H 4 O 7? 5H 2 O) and benzoic acid copper salt (Cupric benzoate _{, Cu (C 7 H 5 O} 2) 2? gas generator with 2H ₂ O) is released with respect to the composition.

U.S. Patent 3193421 (65.7.6) discloses hydroxyl ammonium oxalate as a coolant, ammonium perchlorate (AP) as an oxidant, alkali metal perchlorates (Alkali Metal Perchlorates) and alkaline earth metal (Alkaline) Earth Metal Perchlorate, Combustible Fuel Binder, Polyester Resin, Polyester-Polyurethane, Carboxyl Terminated Linear Polyester and Thiol Terminated Polyester Urethane (Thiol Terminated Polyester-Urethane) as an adjuvant, Ammonium Dichromate, Ferric oxide, Cobaltic oxide, Nitrocellulose and Cobalt acetyl acetonate It is disclosed about the gas-generating agent composition using.

U.S. Patent 3,348,985 (24/10/67), the ammonium nitrate as amino tetrazole (Aminotetrazole), as a fuel oxidizing agent (AN, Ammonium Nitrate) and, optionally, dicyandiamide (DCDA, Dicyandiamide), potassium nitrate (KNO _3), ammonium oxalate ( Pyrotechnic gas generator compositions using Ammonium oxalate, Ammonium Dichromate and the like are disclosed.

U.S. Patent 3362859 (68.1.9) discloses cyclotrimethylene trinitramine (RDX), cyclotetramethylenetertanitramine (HMX), and nitrocellulose (NC, Nitrocellulose, Triaminotrinitrobenzene, trimethylolethenetrinitrate and diaminotrinitrobenzene, a combustible polyester combustion binder comprising carboxyl, hydroxyl and isocyanate-containing polyesters Combustible Polyester Fuel Binder, Hydroxyxamic Acid Type Refrigerant Selected from Oxalohydroxamic Acid, Oxalohydroxamic Acid Amide, Monoammonium Oxaloxamate Fe ₂ O ₃ as a coolant and other adjuvant of the Hydroxamic acid type selected from the group consisting of ium Oxalohydroxamate, Oxalonohydroxamic Acid and Hydroxyl-ammonium Oxalate And gas generators containing 2,4-Diamino-6-phenyl-5-triazine.

U.S. Patent 3468730 (69.9.23) discloses 5-aminotetrazole, guanylamino-5-tetrazole, and 1- which are organotetrazol derivatives as fuels. 1-Guanyl-3-tetrazolyl-5-guanidine, metal salt and metal oxide Ba (NO ₃ ) ₂ , K ₂ Cr ₂ O ₇ , KNO ₃ , PbO _2, MnO ₂ and CuO and to other substances oxalyl hydroxide roksa acid (oxalyl Hydroxamic acid) the propellant may optionally be added to the composition is released.

U.S. Patent 3473981 (69.10.21) discloses ammonium nitrate (AN), melamine, rubber binder, and optionally guanidine nitrate (GN, guanidine nitrate), nitroguanidine, cyclotriri A gas generator composition including methylenetrinitamine (RDX, cyclotrimethylene trinitramine), 2,4-dinitrophenoxy ethanol (2,4-Dinitrophenoxylethanol), sodium barbiturate, and carbon black is disclosed. have.

However, since the gas generators of the BAZA series are not designed in consideration of the acceptance criteria of reaction products according to the USCRA (The United States Council for Automotive Research) standard, there are problems in using them as gas generators for airbags. It is necessary to improve the composition to indicate the allowable concentration level of the exhaust gas. It was in the late 1970s that compositions for meeting USCAR standards as automotive bazide-based gas generators were published.

U.S. Patent 3806461 (74.4.23) discloses a solid gas containing copper oxalate, an organic polymer fuel binder, and enough KClO ₄ to fully oxidize the fuel binder and oxalate. The generator composition is disclosed.

U.S. Patent 4386979 (83.6.7) discloses Calcium Cyanamide and Sodium Hydrogen Cyanamide as fuels, NaNO ₃ as oxidants, Aluminum Oxide, Aluminum Oxide, Calcium Hydroxide, and Combustion Rate Boosters as Coolants. , Compositions comprising MnO ₂ , CuO, Fe ₂ O ₃ , Graphite Fibers, Metal fibers as lubricants or components for physical strength are disclosed, optionally ammonium, alkali metals, alkaline earth metals. Nitrates, nitrites, chlorates, perchlorates, manganese salts (iron, nickel, copper oxides, alkaline earth metal peroxides) of magnesium and aluminum.

U.S. Patent No. 4948439 (90.8.14) discloses at least one tetrazole or triazole compound containing hydrogen in a molecule, i.e., tetrazole, aminotetrazole containing hydrogen, Metal salts of tetrazole or aminotetrazol, mixtures thereof, sodium salt of tetrazole, 5-aminotetrazole (5-AT), ammonium salts of tetrazole and alkali metals as oxidant compounds , Alkaline earth metals and oxidants (alkali metals, alkaline earth metals or ammonium nitrate or perchlorate) and metal oxides such as silicon dioxide, iron oxide, cobalt oxide, nickel oxide, chromium oxide, aluminum oxide, Disclosed are gas generators composed of boron oxide, vanadium oxide, and the like.

U.S. Patent 6143104 (00.11.7) discloses Cyanamides, Tetrazoles, Carbonamides, Triazoles, Guanidines, Guanidine Salts, Ammonium Tetramethyl Nitrate One or more organic fuels, alkali metal nitrates, alkaline earth metal nitrates, alkali metal nitrites selected from the group consisting of Tetramethyl Ammonium Nitrate, Triazines, Tetrazines, Urea and Urea Salts A gas generator comprising at least one oxidant selected from the group consisting of alkaline earth metal nitrites and ammonium halide coolants is disclosed.

As described above, the non-azide-based gas generators disclosed as gas generators for automobile airbags have been released from toxic substances, but have a higher combustion temperature and a slower combustion speed than the azide-based gas generators.

In order to fully cushion and protect the occupant from an impact, the airbag should be inflated within about 30 to 100 milliseconds, and a slow burning composition such as the benzoide-based gas generator may be used as an automotive airbag apparatus. In order to achieve this, the combustion atmosphere of the gas generating agent must be pressurized. In other words, the higher the pressure in the combustion atmosphere, the higher the combustion speed.

The highest pressure created inside the inflator as it burns is called internal pressure. The slower the combustion speed, the higher the internal pressure, and the faster the combustion speed, the lower the internal pressure. In order for the inflator to withstand high internal pressures, the material of the inflator must be designed to withstand it. The material of the inflator using the azide series gas generator having a high combustion rate is made of stainless steel or the inflator using the azide series gas generator having the relatively low combustion rate.

Recently, however, consumers are demanding low-cost, lightweight, and compact inflators, and in order to meet consumer demands and be competitive, the thickness of inflator materials must be minimized. First, there is a need for the development of gas generators that burn rapidly at lower pressures.

In general, the combustion rate is measured under a pressure of 1000 psi (68 atm), and most of the bazide-based gas generators on the market have a combustion speed of about 10 mm / sec. The agent is characterized by high combustion temperature or low gas generation.

In US Patent 5035757 (91.7.30), the composition of Example 5 5-aminotetrazole (5-AT, 5-Aminotetrazole) 33%, Sr (NO ₃ ) ₂ 49%, NaNO ₃ 10%, SiO ₂ 8% Although the combustion speed is relatively fast at 17.78 mm / sec, the combustion gas amount is low at 23 moles / kg, and the combustion temperature is excessively high at about 2800 K.

In US Pat. No. 6887326 (2005.5.3), the burning rate of the composition of Phase Stabilized Ammonium Nitrate (PSAN) and BHT? 2NH ₃ (Diammonium Salt of 5,5'-Bis-1H-Tetrazole) is 12.5 mm / sec. guanidine (Nitroguanidine) When the addition of _{11.2mm / sec, Sr (NO 3} ) the addition of ₂ 11.9mm / sec, the addition of the clay (clay) 6.35mm / sec, Sr (NO 3) 2 and the clay (clay) When added, the overall combustion rate is slow, ranging from 6.6 to 9.1 mm / sec.

In U.S. Patent 5682014 (October 28, 1997), the composition of BTA (Bis- (1 (2) H-tetrazole-5-yl)) and CuO has a relatively fast burning rate of 17.9 to 27.4 mm / sec, but with a 60 liter airbag. The composition takes about 85g to swell sufficiently, and the amount of gas generated is very low.

In US Pat. No. 5,817,972 (1998.10.6), the burn rate of the bazide-based gas generator is relatively fast, ranging from 20.5 to 38.6 mm / sec. However, the composition having a slack formation of 25% or less has a very high calorific value of 762 to 899 cal / g. For compositions with relatively low calorific value of less than 700 cal / g, slack formation is relatively high with 26 to 51.6%.

The combustion rate of 5.5% KNO ₃ -PSAN 55%, Nitroguanidine 44%, Boron Nitride 1% and Silica 0.025% of U.S. Patent 6547900 (2000.2.1) is relatively slow at 15.24 mm / sec. .

The combustion rate of the gas generator of the composition consisting of 5-aminotetrazole (5-AT, 5-Amminotetrazole), Sr (NO ₃ ) ₂ , MgCO ₃ , and KI of U.S. Patent No. 6024889 (2000.2.15) was 1446 K. Low, but slow burning speed of 13 mm / sec.

The composition of Guanidine Nitrate (GN), Ammonium Nitrate (AN), Copper Dimmine Dinitrate (Si) and SiO ₂ in U.S. Patent 6383318 (2002.5.7) has a burn rate of 7.13 to 13.23 mm. It is very slow at / sec, and the composition of Guanidine Nitrate (GN, Guanidine Nitrate), Ammonium Sulfate, Copper Dimmine Dinitrate and SiO ₂ of US Patent 6673173 (2004.1.6) is a high gas. It has a generation amount, but the combustion speed is very slow, from 8.89 to 11.43 mm / sec.

In the early 1990s, basic metal nitrate, a known oxidant, was used to realize low calorific heat, low combustion temperature, low CO content, low NO _X content and relatively fast combustion rate, and to easily filter solid products generated after combustion. Basic metal nitrates began to be used, a typical one being basic copper nitrate (BCN).

Compositions using basic copper nitrate (BCN) as an oxidizing agent are disclosed as follows, but even with the basic copper nitrate (BCN), low combustion temperature, low combustion rate and many gases The gas generating agent which simultaneously meets the generation amount is not implemented.

U.S. Patent 5542998 (96.8.6) discloses 24.6% Diguanidinium-5,5'-Azotetrazolate (GZT) as fuel, 60.29% Basic Copper Nitrate (BCN) as oxidant, and V ₂ O ₅ and MoO ₃ as catalyst. The composition using 15.07% of the mixture (experimental V ₆ Mo ₁₅ O ₆₀ ) has a relatively low combustion temperature of 2212K, excellent ignition power and combustion characteristics, but gas generation is very low, about 20 moles / kg.

Examples of U.S. Patent No. 6132537 (October 17, 2000) include 29.5% Guanidine Nitrate (GN) and 12.8% Cyanuric Acid, 25.65% CuO as oxidant, and Basic Copper Nitrate (BCN) Nitrate) The combustion temperature was lowered below 1700 ℃ by using 25.65% and 6.4% of KClO ₄ , but the gas generation efficiency per 23 kg of gas generating agent was 23moles, so the gas generation efficiency was considerably low. There are drawbacks to using.

U.S. Pat.No. 6,143,102 (2000.11.7) discloses guanidine nitrate (GN) as fuel, copper ethylene diamine dinitrate (CU), basic copper nitrate (BCN) as oxidant, Although Al ₂ O ₃ , TiO ₂ , ZnO, MgO and ZrO ₂ were used to increase the combustion speed to 17 to 27 mm / sec, the combustion gas production rate was 20 to 25 moles per kilogram of gas generator. There is this.

U.S. Patent 6156137 (2000.12.5) discloses azodicarbonamidine dinitrate as a fuel, Sr (NO ₃ ) ₂ as a oxidant, CuO and basic copper nitrate (BCN) as a binder. (Polyalkylene) was used, and the composition using Sr (NO ₃ ) ₂ as oxidant was relatively high in combustion gas production rate of 35moles / kg, but the combustion rate was very low as 12.7mm / sec, and the composition using CuO was used Although it was relatively high at 20.32mm / sec, the combustion gas production amount was low as 27moles / kg, and the composition using basic copper nitrate (BCN) had a relatively high combustion gas production rate at 31moles / kg but the combustion speed was 16.25mm / sec. As a slow disadvantage.

In Example 1 of U.S. Patent 6550808 (2003.4.22), a composition consisting of Guanylurea Nitrate as fuel, Copper Dimmine Dinitrate as an oxidizing agent, and SiO ₂ as other additives has a gas generation amount. Although relatively high at 31.7 moles / kg, the combustion speed is very slow at 8.38 mm / sec. In Example 2, the amount of gas generated was lowered to 26.3 moles / kg and the combustion rate was slowed to 12.95 mm / sec due to the composition in which the oxidizing agent of Example 1 was changed to basic copper nitrate (BCN).

In Example 3 of US Patent 6689237 (2004.2.10), Guanidine Nitrate (GN) and Copper Bis Ethylenediamine-5.5'-Bitetrazole (GN) as fuels, The composition of basic copper nitrate (BCN) and other aluminas has a combustion rate of 16.51 mm / sec, hexamine cobalt and copper bisethylenediamine-5,5'-r as fuel. Combustion rate of composition consisting of Copper Bis Ethylenediamine-5.5'-Bitetrazole and Basic Copper Nitrate (BCN) as oxidizing agent is relatively slow at 16.51mm / sec.

In Examples 4 to 6 of US Pat. No. 6,712,918 (2004.3.30), basic copper nitrate (BCN) as an oxidizing agent, guanidine nitrate (GN) and copper diammine Bitetrazole (GN) as fuel, In addition, the combustion rate of the composition consisting of Al ₂ O ₃ is 10.67 to 13.2 mm / sec, in Example 7, ammonium nitrate (AN, Ammonium Nitrate) and potassium nitrate (KNO ₃ ) as the oxidizing agent, cupperbis-guanil-woo as fuel Composition consisting of Copper Bis-Guanyl Urea Dinitrate, Copper Dimmine Dinitrate, Copper Diamine 5,5'-Bitetrazole and other SiO ₂ The combustion speed is very slow at 8.6 mm / sec.

In Examples 5 to 9 of US Patent 6958101 (October 25, 2005), basic copper nitrate substituted with basic copper nitrate (BCN) as an oxidant, guanidine nitrate (GN) and 5-aminotetrazole as fuel Combustion rates of 5-Aminotetrazole Substituted Basic Copper Nitrate) and other Al ₂ O ₃ compositions are significantly higher, from 15.5 to 47.75 mm / sec, but gas generation is relatively low, from 24.1 to 28.4 moles / kg.

In the examples of U.S. Patent 6964716 (Nov. 15, 2005), the burning rate of the composition of nitroguanidine, Sr (NO ₃ ) ₂ , Al (OH) ₃ and sodium carboxymethylcellulose was 9.47 to 11.2 mm / sec, Nitroguanidine, Nitroguanidine, Sr (NO ₃ ) ₂ , Al (OH) ₃ , Guar Gum Combustion rate of 11.28 to 13.75mm / sec, Guanidine Nitrate (GN, Guanidine Nitrate), Basic Copper Nitrate (BCN , Basic Copper Nitrate), Al (OH) ₃ and Sodium Carboxymethylcellulose, Combustion Rate of 7.32 ~ 7.33mm / sec, Melamine, Basic Copper Nitrate (BCN), Al The burning rate of the composition of (OH) ₃ and guar gum was 10.15 to 13.98 mm / sec, and guanidine nitrate (GN), basic copper nitrate (BCN), Al (OH) ₃ and sodium carboxymethylcellulose (sodium carboxymethylcellulose) to the beam of _{KClO 4, NH 4 ClO 4,} NaClO 4, KClO 3 and NaClO ₃ The burning rate of the composition into an oxidizing agent has a relatively low burn rate to 7.56 to 9.16mm / sec.

Examples of US Pat. No. 7470337 (Dec. 30, 2008) are based on basic copper nitrate (BCN), guanidine nitrate (GN), Al ₂ O ₃ , respectively, based on Cooper (II) bis-4. -10% nitroimidazole (Cpper (II) Bis-4-Nitroimidazole), 10% copper (II) imidazole, and copper (II) imidazole hydroxide ) Combustion rates of 10% and 20% Cpper (II) Bis-4-Nitroimidazole were 14.1 mm / sec, 12.9 mm / sec and 13.3 mm / sec, 20.2 mm / sec, based on basic copper nitrate (BCN), basic copper nitrate (III) nitrate (BCN Cobalt (III) Nitrate), and guanidine nitrate (GN) The burning rate of 10% of Cperper (II) Bis-4-Nitroimidazole was 13.6 mm / sec. Except for the addition of 20% Cperper (II) Bis-4-nitroimidazole, the combustion rate was relatively low and the composition was relatively high at 20.2 mm / sec. The amount of gas produced is very small, 22.84 moles / kg.

As described above, in general, the gas generating composition has a problem in that the amount of combustion heat increases when it is designed to increase the amount of gas generated, and when the amount of burning heat decreases, the amount of gas generated decreases and the combustion speed decreases.

In order to solve the problems of the prior art as described above, the present invention has a low heat of combustion and combustion temperature, a large amount of gas generation, a small amount of H ₂ O in the generated gas, a large amount of nitrogen (N ₂ ), combustion An object of the present invention is to provide a gas generator composition having a high speed and a low pressure burn rate index, a gas generator using the same, and an inflator including the same.

In order to achieve the above object, the present invention is 35 to 55% by weight of basic copper nitrate as the main oxidant, 30 to 50% by weight guanidine nitrate as the main fuel, 2 to 15% by weight combustion fuel having a nitrogen content of 60% by weight or more % And 0.5 to 5% by weight of mixed catalyst, the average particle size of the main oxidizing agent, the main fuel and the combustion rate increasing fuel is 5 to 15㎛, the average particle size of the mixed catalyst for 0.1 to 1㎛ To provide a composition.

In addition, the present invention provides a gas generating agent prepared using the composition for the gas generating agent.

The present invention also provides an inflator manufactured using the gas generating agent.

The gas generator composition of the present invention includes a main oxidant having an average particle size of 5 to 15 μm, a main fuel, a combustion rate increasing fuel, and a mixed catalyst having an average particle size of 0.1 to 1 μm, thereby providing an oxygen balance of -2 to -3. %, Calorific value of combustion is 700kcal / kg or less, combustion temperature is 2300K or less, gas generation amount is 30moles / kg or more, H ₂ O content is less than 49% by volume, N ₂ content is 30% % Or more, a burn rate of at least 18 mm / sec at 1000 psi and a pressure burn rate index of 0.5 or less provide a composition for gas generators.

In addition, the inflator of the present invention includes the composition for the gas generator, thereby providing a lightweight and miniaturized inflator.

1 is a graph showing the tank test performance measurement results of the gas generator composition prepared in Example 3 and the existing product.

Hereinafter, the present invention will be described in detail.

Gas generator composition according to the present invention is 35 to 55% by weight of basic copper nitrate as the main oxidant, 30 to 50% by weight guanidine nitrate as the main fuel, 2 to 15% by weight of the combustion rate increasing fuel having a nitrogen content of at least 60% by weight and 0.5 to 5% by weight of a mixed catalyst is included, and the average particle size of the main oxidant, the main fuel, and the combustion rate increasing fuel is 5 to 15 μm, and the average particle size of the mixed catalyst is 0.1 to 1 μm.

The main oxidizing agent is basic copper nitrate (BCN), the basic copper nitrate is an oxidizing agent, the heat generated is very low to -389.24 kcal / mole to lower the combustion temperature, reduce the production of NO _X and CO, oxygen Oxygen Balance (OB) is 29.985%, which contains a lot of oxygen and can burn a lot of fuel. In addition, it is easy to filter by forming a Cu melt during combustion, and excellent in reactivity to improve the flammability or combustibility, it is preferable as a main oxidant of the gas generator. The basic copper nitrate is preferably included in 35 to 55% by weight based on the total weight of the gas generating composition. In this case, when the content of the main oxidizing agent is less than 35% by weight, the amount of auxiliary oxidant is increased to increase the heat of combustion, the burning rate is decreased, and the combustion rate index is increased. There is a problem that the amount of gas generated decreases because the oxygen balance is increased to -2 or more.

Nitrates (Nitrate) as an auxiliary oxidant to the total weight of the gas generator composition may be further included in 20% by weight or less, wherein the average particle size of the co-oxidant is preferably 5 to 15㎛. The auxiliary oxidant supplements the amount of gas that is insufficient when gas is generated from the composition for generating gas, and serves to compensate for the lack of oxygen. The ammonium nitrate (AN, Ammonium Nitrate) shows an excellent effect to compensate for the insufficient gas amount, potassium nitrate (KNO ₃ ) and sodium nitrate (NaNO ₃ ) has an oxygen balance (OB, Oxygen Balance) + 39.6% and +47.1, respectively As oxygen is high in%, it is possible to make up for insufficient oxygen as well as insufficient oxygen.

At this time, when the content of the auxiliary oxidant exceeds 20% by weight based on the total weight of the composition for the gas generator, the oxygen balance (Oxygen balanece) exceeds -2, the gas generation amount is reduced, the combustion rate is decreased, the combustion rate index There is a problem that is increased. In addition, the auxiliary oxidizing agent may be used as one or more selected from the group consisting of ammonium nitrate (AN, Ammonium Nitrate), potassium nitrate (KNO ₃ ) and sodium nitrate (NaNO ₃ ).

The main fuel is guanidine nitrate (GN, Guanidine Nitrate), the guanidine nitrate (GN, Guanidine Nitrate) has an oxygen balance (O.B., Oxygen Balance) of 26.2%, even a small amount of oxygen can be completely burned. At this time, since the combustion rate of guanidine nitrate (GN) is low, it is more preferable to use it with a combustion rate increasing fuel or a mixed catalyst in order to burn rapidly. The main fuel is preferably contained in 30 to 50% by weight based on the total weight of the gas generating composition. In this case, when the content of the main fuel is less than 30% by weight, the oxygen balance (Oxygen balance) is more than -2, the amount of gas generated is reduced, if the content exceeds 50% by weight Oxygen balance (Oxygen balance) -3 There is a problem that the decrease to less than the amount of carbon monoxide (CO) in the gas product increases.

The combustion rate increasing fuel is preferably a nitrogen-rich compound (Nitrogen Rich Compound) with a nitrogen content of 60% or more. In this case, when the nitrogen content is less than 60%, the water content in the reaction product is increased to reduce the expansion and maintenance effect of the airbag. The combustion rate increasing fuel is a fuel having excellent reactivity and increases the content of nitrogen gas in the gas and increases the combustion rate when gas is generated from the gas generating composition. The combustion rate increasing fuel is preferably contained in 2 to 15% by weight based on the total weight of the gas generating composition. In this case, when the content of the combustion rate increasing fuel is less than 2% by weight, there is a problem in that the combustion speed is reduced, and when the amount of the fuel is increased by more than 15% by weight, the amount of combustion gas is reduced, the amount of heat of combustion is increased, and the combustion rate index is increased. There is a problem.

The burning rate increasing fuel may be used at least one selected from the group consisting of 5-aminotetrazole (5-AT, 5-Aminotetrazole), dicyanidiamide (DCDA, Dicyandiamide) and melamine, but is not limited thereto. It doesn't work.

The mixed catalyst serves to increase the combustion rate of the gas generating composition, and includes metal oxide and carbon black. The mixed catalyst further increases the burning speed of the gas generating composition, and may lower the pressure burning rate index. At this time, the metal oxide (Metal Oxide) is MnO ₂ , Fe ₂ O ₃ , CuO, Fe ₃ O ₄ , SnO ₂ , Co ₂ O ₃ , Cr ₂ O ₃ , NiO, MoO ₃ , ZnO, TiO ₂ , Al ₂ It is preferable to include at least one selected from the group consisting of O ₃ , Bi ₂ O ₃ , SnO ₂ , WO ₃ and VO ₂ .

The mixed catalyst is preferably contained in 0.5 to 5% by weight based on the total weight of the gas generating composition. At this time, when the content of the mixed catalyst is less than 0.5% by weight, the combustion rate is reduced, and the combustion rate index is increased, and when it exceeds 5% by weight, the oxygen balance is reduced to less than -3 to be burned. There is a problem that the amount of carbon monoxide (CO) in the gas is increased and the amount of gas is reduced. In addition, the metal oxide and the carbon black is excellent in the effect of the mixed catalyst to increase the combustion rate when used together compared to the case, respectively, wherein the weight ratio of the metal oxide and carbon black is 1: 2 to 2: 1 It is preferable.

It is preferable that a binder is further contained in an amount of 5 wt% or less based on the total weight of the gas generating composition. In this case, when the content of the binder exceeds 5% by weight, the oxygen balance becomes less than -3, and thus there is a problem in that the amount of carbon monoxide (CO) in the combustion gas is increased. The binder increases the strength and formability of the pellets prepared from the gas generating composition, preferably polyvinyl alcohol (PVA, Polyvinylalcohol) or α-Starch.

It is preferable that a releasing agent is further contained in 1 weight% or less with respect to the total weight of the said composition for gas generating agents. At this time, when the content of the release agent exceeds 1% by weight there is a problem that the burning speed is reduced. The release agent increases the moldability and ejectability of the pellets, preferably a metal stearate, and more preferably calcium stearate.

The combustion rate of the gas generant composition of the present invention is affected by the average particle size of the components included in the gas generant composition, in order to increase the combustion rate of the main oxidizing agent, the auxiliary oxidant, the main fuel, and the combustion rate increasing fuel. The average particle size is preferably 5 to 15 mu m, and the average particle size of the mixed catalyst is preferably 0.1 to 1 mu m in order to increase the combustion rate increase effect of the mixed catalyst. At this time, when the average particle size of the main oxidant, auxiliary oxidant, the main fuel and the combustion rate increasing fuel is less than 5㎛, there is a problem that the manufacturing cost is increased, and when the average particle size exceeds 15㎛, the surface area is reduced to reduce the combustion speed. There is a problem. In addition, if the average particle size of the mixed catalyst is less than 0.1㎛ there is a problem that the manufacturing cost is increased, if it exceeds 1㎛ there is a problem that the combustion speed is reduced by reducing the effect of the mixed catalyst.

The composition for the gas generator, the oxygen balance (OB, Oxygen Balance) of -2 to -3%, combustion heat amount 700kcal / kg or less, combustion temperature 2300K or less, gas generation amount 30moles / kg or more, generated gas H _{It is preferable that} the content of ₂ O is 49 vol% or less, the content of N _{2 in} the generated gas is 30 vol% or more, the burning rate is 1000 mm / sec or more at 1000 psi, and the pressure burning rate index is 0.5 or less.

The concentration of carbon monoxide (CO) in the exhaust gas generated from the gas generator composition is generated to be 50% or less of the exhaust gas acceptance limit restricted by the United States Council for Automotive Research (USCAR), and thus, from the gas generator composition. Maximize the amount of gas produced and minimize the heat of combustion. That is, when the gas generator is combusted in a tank of 2.83 m 3, carbon monoxide (CO) is discharged at 230 to 280 ppm, which is 50 to 60% of 461 ppm which is the emission standard of carbon monoxide (CO). Oxygen balance (OB) is -2 to -3%.

In addition, the average particle size of the metal oxide (Metal Oxide) and carbon black (Carbon Black) used as a mixed catalyst to achieve an increased combustion rate and a reduced pressure burn rate index is 0.1 to 1㎛, It is preferable that the mixed catalyst is contained in an amount of 0.5 to 5% by weight, more preferably 0.3 to 2% by weight, and 0.3 to 2 carbon black, based on the total weight of the gas generating composition. It is preferably included in weight percent.

The present invention provides a gas generator produced using the composition for the gas generator. The gas generating composition may be molded into pellets and formed into a gas generating agent used in an inflator, wherein the strength of the gas generating agent is preferably 8 kgf or more and a density of 1.8 g / cc or more.

Furthermore, the present invention provides an inflator manufactured using the gas generator.

Hereinafter, the present invention will be described in detail by way of examples.

However, the following examples are illustrative of the present invention, and the present invention is not limited to the following examples.

<Examples>

Example  One

(Composition for Gas Generator)

48.2 wt% of basic copper nitrate (BCN) with an average particle size of 5 to 8 μm, 42.9 wt% of guanidine nitrate (GN) with an average particle size of 5 to 8 μm, and 5-amino having an average particle size of 8 to 12 μm 7.9 wt% of tetrazole (5-AT, 5-Aminotetrazole), 0.5 wt% of iron oxide (Fe ₂ O ₃ ) having an average particle size of 0.2 to 0.8 μm, and 0.5 wt% of carbon black having an average particle size of 0.2 to 0.5 μm Mixing to prepare a gas generating composition.

The average particle size was measured using a MALBERN sizer after grinding each component with a ball mill, an attrition mill, a bead mill, and the like.

(Gas Generation)

The gas generator composition was prepared in the form of pellets having a specific gravity of 1.8 g / cc or more and a diameter of 6 mm and a thickness of 1.8 mm.

Example  2

(Composition for Gas Generator)

44.4 wt% of basic copper nitrate (BCN) with an average particle size of 5 to 8 μm, 8.1 wt% of ammonium nitrate (AN), 0.9 wt% of potassium nitrate (KNO ₃ ), and an average particle size of 5 to 8 μm. Guanidine Nitrate (GN) 36.1 wt%, 8.0 wt% 5-aminotetrazole (5-AT, 5-Aminotetrazole) having an average particle size of 8 to 12 μm, iron oxide (Fe ₂ O ₃ having an average particle size of 0.2 to 0.8 μm) ) 1.0% by weight and 1.5% by weight of carbon black (Carbon Black) having an average particle size of 0.2 to 0.5㎛ was mixed to prepare a gas generating composition.

The ammonium nitrate (AN, Ammonium Nitrate) and potassium nitrate (KNO ₃ ) is completely dissolved by heating the temperature to about 90 ℃ while stirring in a container so that 15% by weight of water relative to the total weight of the ammonium nitrate and potassium nitrate mixture solution After cooling, the temperature was cooled to about 50 ° C. while stirring to co-crystallize ammonium nitrate (AN, Ammonium Nitrate) and potassium nitrate (KNO ₃ ), and then ammonium nitrate (AN, Ammonium Nitrate) and potassium nitrate ( Precipitated by adding 50% by weight of anhydrous ethanol to the total weight of KNO ₃ ). Thereafter, the average particle size was pulverized to 10 to 14㎛ with a pulverizer and dried, and included in the gas generator composition as a co-crystal form of ammonium nitrate and potassium nitrate.

The average particle size was measured using a MALBERN sizer after grinding each component with a ball mill, an attrition mill, a bead mill, and the like.

 (Gas Generator)

Gas generator was prepared in the same manner as in Example 1.

Example  3

(Composition for Gas Generator)

46.4% by weight of basic copper nitrate (BCN), ammonium nitrate (AN) with an average particle size of 5 to 8 μm, pulverized with a ball mill, attrition mill, bead mill, etc. , Ammonium Nitrate) 3.5% by weight, potassium nitrate (KNO ₃ ) 0.6% by weight, 42.3% by weight guanidine nitrate (GN, Guanidine Nitrate) having an average particle size of 5 to 8㎛, 5-aminotetrazole having an average particle size of 8 to 12㎛ 5-AT, 5-Aminotetrazole) 5.0% by weight, 1.0% by weight of iron oxide (Fe ₂ O ₃ ) having an average particle size of 0.2 to 0.8㎛, 1.0% by weight of carbon black (Carbon Black) having an average particle size of 0.2 to 0.5㎛ and an average particle size of 0.5 To prepare a gas generating composition by mixing 0.2% by weight of calcium stearate (Ca-Stearate) to 1.0㎛.

The ammonium nitrate (AN, Ammonium Nitrate) and potassium nitrate (KNO ₃ ) is completely dissolved by heating the temperature to about 90 ℃ while stirring in a container so that 15% by weight of water relative to the total weight of the ammonium nitrate and potassium nitrate mixture solution After cooling, the temperature was cooled to about 50 ° C. while stirring to co-crystallize ammonium nitrate (AN, Ammonium Nitrate) and potassium nitrate (KNO ₃ ), and then ammonium nitrate (AN, Ammonium Nitrate) and potassium nitrate ( Precipitated by adding 50% by weight of anhydrous ethanol to the total weight of KNO ₃ ). Thereafter, the average particle size was pulverized to 10 to 14㎛ with a pulverizer and dried, and included in the gas generator composition as a co-crystal form of ammonium nitrate and potassium nitrate.

The average particle size was measured using a MALBERN sizer after grinding each component with a ball mill, an attrition mill, a bead mill, and the like.

 (Gas Generation)

Gas generator was prepared in the same manner as in Example 1.

Example  4

(Composition for Gas Generator)

In Example 3, 46.3% by weight of basic copper nitrate (BCN), 4.5% by weight of ammonium nitrate (AN, Ammonium Nitrate), 0.8% by weight of potassium nitrate (KNO ₃ ), guanidine nitrate (GN, Guanidine Nitrate) 38.4% by weight, 8.0% by weight of 5-aminotetrazole (5-AT, 5-Aminotetrazole), 1.0% by weight of iron oxide (Fe ₂ O ₃ ), 0.8% by weight of Carbon Black and Ca-Stearate ) Was carried out in the same manner as in Example 3, except that 0.2% by weight was mixed.

 (Gas Generation)

Gas generator was prepared in the same manner as in Example 1.

Example  5

(Composition for Gas Generator)

In Example 3, 42.5% by weight of basic copper nitrate (BCN, Basic Copper Nitrate), 9.5% by weight of ammonium nitrate (AN, Ammonium Nitrate), 1.7% by weight of potassium nitrate (KNO ₃ ), guanidine nitrate (GN, Guanidine Nitrate) 39.1 wt%, 5-aminotetrazole (5-AT, 5-Aminotetrazole) 3.0 wt%, Iron oxide (Fe ₂ O ₃ ) 2.0 wt%, Carbon Black 2.0 wt% and Calcium Stearate (Ca-Stearate ) Was carried out in the same manner as in Example 3, except that 0.2% by weight was mixed.

(Gas Generator)

Gas generator was prepared in the same manner as in Example 1.

Example  6

(Composition for Gas Generator)

In Example 3, 46.13% by weight of basic copper nitrate (BCN), 5.1% by weight of ammonium nitrate (AN, Ammonium Nitrate), 0.9% by weight of potassium nitrate (KNO ₃ ), guanidine nitrate (GN, Guanidine Nitrate) 40.17 wt%, 5-Aminotetrazole (5-AT, 5-Aminotetrazole) 5.0 wt%, Iron Oxide (Fe ₂ O ₃ ) 1.0 wt%, Carbon Black 1.0 wt%, Calcium Stearate (Ca-Stearate ) The process was carried out in the same manner as in Example 3, except that 0.2% by weight and 0.5% by weight of the binder were added.

(Gas Generator)

Gas generator was prepared in the same manner as in Example 1.

Example  7

(Composition for Gas Generator)

In Example 1, 38.0 wt% of basic copper nitrate (BCN), 41.2 wt% of guanidine nitrate (GN), 9.0 wt% of 5-aminotetrazole (5-AT, 5-Aminotetrazole), 1.0% by weight of iron oxide (Fe ₂ O ₃ ), 0.6% by weight of carbon black (carbon black) 10.0% by weight sodium nitrate (NaNO ₃ ) having an average particle size of 8 to 12㎛ and calcium stearate with an average particle size of 0.5 to 1.0㎛ It carried out similarly to Example 1 except adding 0.2 weight% of (Ca-Stearate).

(Gas Generation)

Gas generator was prepared in the same manner as in Example 1.

Example  8

(Composition for Gas Generator)

In Example 3, 44.1 wt% basic copper nitrate (BCN), 13.5 wt% ammonium nitrate (AN, Ammonium Nitrate), 2.4 wt% potassium nitrate (KNO ₃ ), guanidine nitrate (GN, Guanidine Nitrate) 31.3% by weight, 1.0% by weight of iron oxide (Fe ₂ O ₃ ), 1.5% by weight of Carbon Black and 0.2% by weight of calcium stearate (Ca-Stearate) having an average particle size of 0.5 to 1.0 μm, and 5-amino Except for using tetrazol (5-AT, 5-Aminotetrazole) 6.0% by weight of dicyandiamide (DCDN, Dicyandiamide) having an average particle size of 8 to 12㎛, it was carried out in the same manner as in Example 3.

 (Gas Generation)

Gas generator was prepared in the same manner as in Example 1.

Example 9

(Composition for Gas Generator)

In Example 3, 45.0 wt% of basic copper nitrate (BCN), 10.5 wt% of ammonium nitrate (AN, Ammonium Nitrate), 1.0 wt% of potassium nitrate (KNO ₃ ), guanidine nitrate (GN, Guanidine Nitrate) 34.4% by weight, 1.0% by weight of iron oxide (Fe ₂ O ₃ ), 1.0% by weight of Carbon Black and 0.2% by weight of Ca-Stearate, 5-aminotetrazole (5-AT, It was carried out in the same manner as in Example 3, except that 6.0 wt% of melamine having an average particle size of 8 to 12 μm was mixed instead of 5-Aminotetrazole).

(Gas Generator)

Gas generator was prepared in the same manner as in Example 1.

Raw material name Average particle size of the components used in Examples 1-9 Raw material name Average particle size of the components used in Examples 1-9 Basic Copper Nitrate (BCN) 5 ~ 8㎛ Guanidine nitrate (GN) 5 ~ 8㎛ Crystallization Forms of NH ₄ NO ₃ and KNO ₃ 10 ~ 14㎛ 5-aminotetrazole (5-AT) 8 ~ 12㎛ NaNO ₃ 8 ~ 12㎛ Dicyandiamide (DCDA) 8 ~ 12㎛ Fe ₂ O ₃ 0.2 ~ 0.8㎛ Melanin 8 ~ 12㎛ Carbon black 0.2 ~ 0.5㎛ Calcium stearate 0.5 to 1.0 탆

<Comparative Example>

Comparative example  One

43.1% by weight of basic copper nitrate (BCN) with an average particle size of 6 μm and 56.9% by weight of guanidine nitrate (GN) with an average particle size of 6 μm were mixed in a mixer. Afterwards, a specific gravity of 1.8 g / cc or more, a diameter of 6 mm and a length of 80 mm was formed.

Comparative example  2

In Comparative Example 1, except that basic copper nitrate (BCN, Basic Copper Nitrate) having an average particle size of 22 ㎛ and guanidine nitrate (GN, Guanidine Nitrate) having an average particle size of 27 ㎛ was the same as in Comparative Example 1 Was carried out.

Comparative example  3

48.7% by weight of basic copper nitrate (BCN) having an average particle size of 5 to 8 μm, and ground to an average particle size of 5 to 8 by grinding with a ball mill, an attribution mill, a bead mill, and the like. A gas generator composition was prepared by mixing 43.3 wt% of guanidine nitrate (GN) with 8 μm and 8.0 wt% of 5-aminotetrazole (5-AT, 5-Aminotetrazole) having an average particle size of 8-12 μm.

Comparative example  4

48.2% by weight of basic copper nitrate (BCN) having an average particle size of 5 to 8 µm, and ground to an average particle size of 5 to 8 by grinding with a ball mill, an attribution mill, a bead mill, and the like. 42.9% by weight guanidine nitrate (GN) with 8㎛ and 7.9% by weight 5-aminotetrazole (5-AT, 5-Aminotetrazole) with average particle size 8-12㎛, iron oxide (Fe ₂ O) with average particle size 2.5㎛ ₃ ) was mixed at 1.0% by weight to prepare a gas generating composition.

Comparative example  5

In Comparative Example 4, and is, was the same procedure as in Comparative Example 4 except that the more the average particle size of 2.5㎛ iron oxide (Fe ₂ O ₃₎ of iron oxide 0.2㎛ instead of (Fe ₂ O ₃₎ 1.0% by weight .

<Experimental Example>

The compositions and combustion test results of Comparative Examples 1 to 5 are shown in Tables 2 and 3 below, and the compositions, properties of theoretical compositions, and combustion test results of Examples 1 to 9 are shown in Table 4 below.

Oxygen balance (OB), calorific value of combustion, combustion temperature, gas volume, volume of water vapor (H ₂ O) and nitrogen (N ₂ ) volume are calculated values. Combustion rate and pressure combustion rate index are Tested and shown in the same manner.

The combustion rate is a specific gravity of 1.8g / cc or more of the gas generator composition by press molding into a strand (Strand) of 6mm diameter and 90mm in length, and then burned in a chamber of 1000psi (68atm) by burning a certain length The time taken to calculate the constant length divided by the burned time was calculated. At this time, the pressure in the chamber was kept constant as the strand burned.

The combustion rate index is calculated by Equation 1 below. The propellant or gas generator is combusted according to R = AP ⁿ , where R is the combustion rate, A is the constant by the system, P is the pressure, and n is the pressure combustion rate index. The pressure velocity was measured by varying the pressure from 68 atm to 200 atm from the following Equation 1 for the log on R = AP ⁿ , and the burn rate index n was obtained by obtaining the slope of the linear graph of logP according to logR.

Raw material name Composition (unit: weight%) Average particle size (㎛) Comparative Example 1 Comparative Example 2 BCN 43.1 6 22 Guanidine Nitrate 56.9 6 27 Combustion rate at 1000 psi (mm / sec) 7.4 6.3

Raw material name (unit: weight%) Comparative Example 3 Comparative Example 4 Comparative Example 5 BCN 48.7 48.2 48.2 GN 43.3 42.9 42.9 5-AT 8.0 7.9 7.9 Fe 2 O 3 (2.5 μm) - 1.0 - Fe 2 O 3 (0.2 μm) - - 1.0 Combustion rate at 1000 psi (mm / sec) 11.2 12.1 16.5

Raw material name (unit: weight%) Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Basic Copper Nitrate (BCN) 48.2 44.4 46.4 46.3 42.5 46.13 38.0 44.1 45.0 NH ₄ NO ₃ - 8.1 3.5 4.5 9.5 5.1 - 13.5 10.5 KNO ₃ - 0.9 0.6 0.8 1.7 0.9 - 2.4 1.9 NaNO ₃ - - - - - - 10.0 - - Guanidine nitrate (GN) 42.9 36.1 42.3 38.4 39.1 40.17 41.2 31.3 34.4 5-aminotetrazole (5-AT) 7.9 8.0 5.0 8.0 3.0 5.0 9.0 - - Dicyandiamide (DCDA) - - - - - - - 6.0 - Melamine - - - - - - - - 6.0 Carbon black 0.5 1.5 1.0 0.8 2.0 1.0 0.6 1.5 1.0 Fe ₂ O ₃ 0.5 1.0 1.0 1.0 2.0 1.0 1.0 1.0 1.0 Calcium stearate - - 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Binder (PVA, α-Starch) - - - - - 0.5 - - - Total weight 100 100 100 100 100 100 100 100 100 Oxygen equilibrium (O.B.,%) -3.0 -2.00 -2.66 -2.67 -2.57 -2.63 -2.68 -2.62 -2.66 Combustion heat (kcal / kg) 631 674 643 651 654 652 651 654 610 Combustion temperature (K) 2130 2238 2137 2182 2135 2160 2166 2114 1945 Gas amount (moles / kg) 30.11 30.05 30.01 30.3 30.6 30 30.04 30 30.05 Water vapor (H ₂ O) volume% 46.8 48.5 48.2 47.6 48.6 48.4 45.1 49.0 48.8 N ₂ % by volume 34.3 33.6 32.7 34.0 31.4 32.3 35.9 30.9 31.2 Burning speed (mm / sec) 18.05 23.5 18.3 23.5 18.5 25.5 23.3 18.2 18.5 Pressure burn rate index 0.39 0.34 0.36 0.48 0.41 0.39 0.49 0.46 0.45

The gas generator composition of Example 3 was prepared in a pellet form having a specific gravity of 1.8 g / cc or more, a diameter of 6 mm, and a thickness of 1.8 mm, and then placed in an inflator to measure tank test performance, and the results are shown in FIGS. 1 and 5. It was.

Product Name Bar pressure Tank pressure (bar) Tank maximum pressure delivery time (ms) Gas generation amount (%) Initial gas release time after operation (ms) Example 3 137 2 67.2 75% 3.09 Existing product A 300 2.01 64.4 70-75% 3.4 ~ 3.7

The compositions of Comparative Examples 1 to 5 did not reach the target burning rate of 18 mm / sec, basic copper nitrate (BCN) having an average particle size of 22 μm and guanidine nitrate having an average particle size of 27 μm ( GN, Guanidine Nitrate) in the case of using the average particle size of 6㎛ small in Comparative Example 2, respectively, the combustion rate was 7.4mm / sec to increase the combustion rate. In addition, when the 5-aminotetrazole (5-AT, 5-Aminotetrazole) is further included in the comparative example 1 8% by weight, the burning rate is further increased to 11.2mm / sec, the average particle size of 2.5 ㎛ Fe ₂ O _When 1 wt% of the mixed catalyst was further included, the combustion rate was measured to be 12.1 mm / sec. Furthermore, when Fe ₂ O ₃ mixed catalyst having an average particle size of 0.2 μm was included instead of Fe ₂ O ₃ having an average particle size of 2.5 μm, the combustion rate was measured to be 16.5 mm / sec.

As in the combustion rate measurement results of Examples 1 to 9, 5-aminotetrazole (5-AT, 5-Aminotetrazole, nitrogen content 82.3%) as a combustion rate increasing fuel, based on the total weight of the gas generating composition dicyandiamide (DCDA, dicyandiamide, nitrogen content 66.6%) and melamine are nitrogen containing large amounts material than nitrogen is 60% as shown in (melamine, a nitrogen content of 66.6%) containing from 3 to 9% by weight, with a mixed catalyst Fe ₂ O ₃ and the composition for the gas generator further comprises 0.5 to 2.0% by weight of carbon black, respectively, the amount of gas generation is more than 30moles / kg, the content of H ₂ O (g) 50% by volume of the total gas generation The nitrogen (N ₂ ) content was less than 30% by volume of the total gas generation, the heat of combustion was 700kcal / kg or less, the combustion temperature was 2300K or less. In addition, the pressure was 1000 psi (68 atm), and the combustion rate measured in a constant chamber was all 18 mm / sec or more, and the pressure combustion rate index was 0.5 or less.

In addition, the inflator was manufactured and tested for performance using Example 3, as shown in FIG. It is possible to provide an inflator with a pressure of 140 bar or less. Therefore, when the maximum pressure is 140bar or less, it is possible to minimize the thickness of the closure of the inflator to 1.4mm and the thickness of the diffuser to 1.2mm. Accordingly, the weight of the inflator is also reduced, thereby providing a compact and lightweight inflator with a weight of 280g, which is 160g less than the weight of 440g of the existing A product, which has a thickness of 1.9mm for each closure and diffuser.

Claims (12)

35 to 55 wt% of basic copper nitrate as main oxidant, 30 to 50 wt% of guanidine nitrate as main fuel, 2 to 15 wt% of burning rate increasing fuel having nitrogen content of 60 wt% or more, and 0.5 to 5 wt% of mixed catalyst And a mean particle size of the main oxidizing agent, a main fuel and a combustion rate increasing fuel is 5 to 15 μm, and an average particle size of the mixed catalyst is 0.1 to 1 μm. The gas generator composition according to claim 1, further comprising 20 wt% or less of nitrate as an auxiliary oxidant based on the total weight of the gas generator composition, and an average particle size of the auxiliary oxidant being 5 to 15 µm. The gas generator composition according to claim 2, wherein the auxiliary oxidizing agent is at least one selected from the group consisting of ammonium nitrate, potassium nitrate and sodium nitrate. The gas generator composition according to claim 1, wherein the burning rate increasing fuel is at least one selected from the group consisting of 5-aminotetrazole, dicyandiamide, and melamine. The composition of claim 1, wherein the mixed catalyst comprises a metal oxide and carbon black in a weight ratio of 1: 2 to 2: 1. The gas generator composition of claim 1, wherein the binder is further included in an amount of 5 wt% or less based on the total weight of the gas generator composition. The gas generator composition according to claim 6, wherein the binder is polyvinyl alcohol or α-starch. The composition of claim 1, wherein the release agent having an average particle size of 0.1 to 1 μm is further included in an amount of 1 wt% or less, based on the total weight of the gas generating composition. The gas generator composition according to claim 8, wherein the release agent is a metal stearate. The method of claim 1, wherein the gas generator composition has an oxygen balance of -2 to -3%, a heat of combustion of 700 kcal / kg or less, a combustion temperature of 2300 K or less, a gas generation amount of 30 moles / kg or more, and H ₂ O in the generated gas. The content of 49% by volume or less, the content of N _{2 in} the generated gas 30% by volume or more, the combustion rate is 1000mm psi or more at 18psi / sec and the pressure burning rate index is characterized in that 0.5 or less. Gas generator produced using the composition for gas generator of claim 1. An inflator manufactured using the gas generating agent of claim 11.

Images