Gas generating agent composition and method for producing the same

Abstract

To provide a gas generating agent composition (explosive) with a low combustion temperature, excellent moldability and ignition properties, and a method for producing the same. [Solution] A gas generating agent composition containing the following components: (a) fuel: 5% by mass or more and 55% by mass or less; (b) oxidizing agent: 20% by mass or more and 70% by mass or less; (c) binder: 0.5% by mass or more and 55% by mass or less; and (d) additive as an optional component: 20% by mass or less; wherein the (c) component (binder) contains crystalline cellulose (CEL) with an average degree of polymerization of 100 to 350, and a method for producing the same.

Description

[Technical Field]

[0001] This invention relates to a gas generating agent composition that can be used in airbag inflators and the like, and a method for producing the same. [Background technology]

[0002] In vehicle safety devices such as airbag systems installed in vehicles, inflators that deploy the bag by burning a gas generating agent are widely used. These gas generating agents for airbag inflators generally contain fuel, oxidizer, and various additives, and the optimal composition is being sought from various indicators / perspectives such as combustion temperature, ignition properties, and heat resistance. Furthermore, a method is known in which a binder (hereinafter also called a binder) is added to bond the various components contained in the gas generating agent and make the molded body strong. By adding a binder, the strength of the molded body is increased, and cracking and collapse during subsequent handling can be prevented.

[0003] For example, Patent Document 1 states that carboxymethylcellulose sodium salt is preferred when considering the adhesive performance, price, and ignition properties of the binder. However, gas generating agents using this binder have ignition problems, and in the event of a collision, a highly flammable igniter must be used to ensure that the gas generating agent ignites reliably.

[0004] Furthermore, Patent Document 2 describes a gas generating agent composition in which ignition properties are improved by adjusting the fuel components and their content ratios. However, even in Patent Document 2, carboxymethylcellulose sodium salt is used as the binder, so there is room for improvement in terms of ignition properties.

[0005] Furthermore, Patent Document 3 describes a gas generating composition that improves ignition while minimizing combustion interruption in low-pressure environments by employing potassium perchlorate in addition to basic copper nitrate as an oxidizing agent component. However, the addition of potassium perchlorate presents a new challenge: an increase in combustion temperature. When an airbag deploys, a component called a coolant is installed inside the inflator to cool the combustion gases and prevent occupants from being burned by high-temperature combustion gases. However, in recent years, there has been a demand for lighter inflators, and it is preferable for the coolant, which is a heavy component, to be small and light. Against this backdrop, it is preferable for the combustion temperature of the gas generating agent composition to be low.

[0006] Furthermore, Patent Document 4 states that gas generating agent compositions using other organic or inorganic binders besides carboxymethylcellulose sodium salt can be used. However, the detailed properties of these binders are not described, and only the combustion gas components are mentioned regarding their combustion characteristics. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent No. 3907548 [Patent Document 2] Patent No. 5785768 [Patent Document 3] Japanese Patent Publication No. 2024-37522 [Patent Document 4] Patent No. 5085903 [Overview of the project] [Problems that the invention aims to solve]

[0008] As mentioned above, in order to improve the moldability of the gas generating agent itself so that it can withstand various vibrations and shocks in airbag inflators, it is preferable to add a binder component. However, when existing organic binders such as carboxymethylcellulose sodium salt are added, it causes a decrease in ignition ability and an increase in combustion temperature. On the other hand, when inorganic binders are added, the amount of components that gasify through combustion decreases, resulting in a decrease in gasification efficiency.

[0009] In view of the aforementioned conventional standards, the problem that the present invention aims to solve is to provide a gas generating agent composition with a low combustion temperature, excellent moldability and ignition properties, and a method for producing the same. [Means for solving the problem]

[0010] The inventors of the present invention, in an effort to solve the aforementioned problems, conducted extensive research and experiments, and as a result, unexpectedly discovered that the aforementioned problems could be solved by the following configuration, leading to the completion of the present invention.

[0011] In other words, the present invention is as follows: [1] The following ingredients: (a) Fuel: 5% by mass or more and 55% by mass or less; (b) Oxidizing agent: 20% by mass or more and 70% by mass or less; (c) Binder: 0.5% by mass or more and 55% by mass or less; and (d) Additives as optional components: 20% by mass or less; A gas generating agent composition containing the above, wherein the (c) component (binder) comprises crystalline cellulose (CEL) with an average degree of polymerization of 100 to 350. [2] The gas generating agent composition according to [1], wherein the component (b) (oxidizing agent) is one or more selected from the group consisting of nitrates, basic metal nitrates, nitrites, and inorganic peroxides. [3] The gas generating agent composition according to [2], wherein the nitrate is basic copper nitrate (BCN), strontium nitrate (SrN), or potassium nitrate (PN). [4] The gas generating agent composition according to any one of [1] to [3], wherein the component (a) (fuel) contains at least one selected from the group consisting of guanidine nitrate (GN) and nitroguanidine (NQ). [5] The gas generating agent composition according to any one of [1] to [4], wherein the component (d) (additive) contains aluminum hydroxide (AlOH). [6] The gas generating agent composition according to any one of [1] to [5], wherein the average particle diameter of the crystalline cellulose (CEL) is 15 μm or more and 250 μm or less. [7] The gas generating agent composition according to any one of [1] to [6], wherein the angle of repose of the crystalline cellulose (CEL) is 30° or more and less than 65°. [8] The apparent specific volume of the crystalline cellulose (CEL) is 2 cm 3 / g or more and 15 cm 3 / g or less. The gas generating agent composition according to any one of [1] to [7]. [9] The following components: (a) Fuel: 5% by mass or more and 55% by mass or less; (b) Oxidizing agent: 20% by mass or more and 70% by mass or less; (c) Binder containing crystalline cellulose (CEL) having an average degree of polymerization of 100 or more and 350 or less: 0.5% by mass or more and 55% by mass or less; and (d) Additive as an optional component: 20% by mass or less; Mixing them dry to obtain a mixed powder; and Compressing and molding the obtained mixed powder if necessary; The method for producing a gas generating agent composition according to [1] or [2], comprising:

[10] The method for producing a gas generating agent composition according to [9], wherein the average particle diameter of the crystalline cellulose (CEL) is 15 μm or more and 250 μm or less.

[11] The method for producing a gas generating agent composition according to [9] or

[10] , wherein the angle of repose of the crystalline cellulose (CEL) is 30° or more and less than 65°.

[12] The apparent specific volume of the crystalline cellulose (CEL) is 2 cm 3 / g or more and 15 cm 3The method for producing a gas generating agent composition according to any one of [9] to

[11] below which is below / g.

Advantages of the Invention

[0012] According to the method for producing a gas generating agent composition (gunpowder) according to the present invention, by using crystalline cellulose having specific properties as a binder, it is possible to produce a gas generating agent composition (gunpowder) having a low combustion temperature, excellent moldability, and ignition properties, and it can be widely and commonly used for gas generating agents containing various fuels, oxidants, and additives.

Embodiments for Carrying Out the Invention

[0013] Hereinafter, embodiments of the present invention will be described in detail. <Fuel> The gas generating agent composition of this embodiment contains component (a) (fuel) at 5% by mass or more and 55% by mass or less. Such a content ratio is preferably 10 to 50% by mass, more preferably 30 to 50% by mass, and still more preferably 30 to 40% by mass. As component (a), as a nitrogen-containing fuel, one kind selected from tetrazole compounds, guanidine compounds, triazine compounds, and nitroamine compounds can be used, or two or more kinds can be used in combination. Examples of tetrazole compounds include tetrazole, 5-aminotetrazole, 5,5'-bi-1H-tetrazole, 5-nitroaminotetrazole, 5-oxo-1,2,4-triazole, aminotetrazole nitrate, nitroaminotetrazole, zinc salt of 5-aminotetrazole, copper salt of 5-aminotetrazole, bitetrazole (5,5'-bi-1H-tetrazole), azobistetrazole, 5,5'-azobistetrazole diguanidium salt, potassium salt of bitetrazole, sodium salt of bitetrazole, magnesium salt of bitetrazole, calcium salt of bitetrazole, diammonium salt of bitetrazole, copper salt of bitetrazole, and melamine salt of bitetrazole. Examples of guanidine compounds include guanidine, mono, di, or triaminoguanidine nitrates, guanidine nitrate, guanidine carbonate, nitroguanidine, dicyandiamide, and nitroaminoguanidine nitrate. Examples of triazine compounds include melamine, cyanuric acid, ammelin, ammelido, and ammeland. Examples of nitroamine compounds include cyclo-1,3,5-trimethylene-2,4,6-trinitramine. (a) The component (fuel) may preferably be guanidine nitrate (GN) or nitroguanidine (NQ).

[0014] <Oxidizing agent> The gas generating agent composition of this embodiment contains component (b) (oxidizing agent) in an amount of 20% by mass or more and 70% by mass or less. The oxidizing agent is not particularly specified as long as it is an oxidizing agent commonly used in automotive gas generating agents. However, from the viewpoint of the toxicity of the generated gas, it is preferable that it be one or more selected from the group consisting of nitrates, basic metal nitrates, nitrites, and inorganic peroxides. The toxicity of the generated gas can be reduced by not including sulfur, phosphorus, etc., in the oxidizing agent component. Furthermore, the content ratio is preferably 30 to 55% by mass, and more preferably 40 to 55% by mass. The nitrate can preferably be basic copper nitrate (BCN), strontium nitrate (SrN), or potassium nitrate (PN).

[0015] <Binder> The gas generating agent composition of this embodiment contains component (c) (binder), which includes crystalline cellulose (CEL), in an amount of 0.5% by mass or more and 55% by mass or less. The content is preferably 0.5% by mass or more and 50% by mass or less, and more preferably 5.0 to 15% by mass. In this specification, the term "crystalline cellulose (CEL)" refers to α-cellulose obtained as pulp from fibrous plants, partially depolymerized with acid, and then purified. Examples of crystalline cellulose (CEL) include UF, KG, OD, and PH grades of Ceolus® manufactured by Asahi Kasei Corporation. By using a binder, the moldability of the gas generant can be improved, and by including crystalline cellulose as these binder components, the ignition property can be improved and the combustion temperature during combustion of the gas generant can be reduced.

[0016] The crystalline cellulose, which is the component (binder) contained in the gas generant composition of the embodiment, has an average degree of polymerization of 100 or more and 350 or less, preferably 150 to 300, and more preferably 180 to 280. It is preferable to set the average degree of polymerization to 100 or more because the moldability is improved. On the other hand, it is preferable to set it to 350 or less because the fluidity of the powder is excellent without the manifestation of fibrous properties. That is, it is preferable to set the average degree of polymerization of crystalline cellulose to 100 or more and 350 or less because the balance between moldability and fluidity is particularly excellent.

[0017] The crystalline cellulose contained in the gas generant composition of the present embodiment preferably has an average particle diameter of 15 μm or more and 250 μm or less, more preferably 30 to 180 μm. If the average particle diameter is less than 15 μm, the adhesion and aggregation properties become strong, so it is preferable that the handling property is 15 μm or more. On the other hand, it is preferable to set the average particle diameter to 250 μm or less because separation and segregation from the active component do not occur and there is no risk of deteriorating the content uniformity of the gas generant components.

[0018] The crystalline cellulose contained in the gas generant composition of the present embodiment preferably has an angle of repose, which is an index of powder fluidity, of 30° or more and less than 65°, more preferably 34 to 45°, from the viewpoint of the uniformity of each component in the gas generant.

[0019] The apparent specific volume of the crystalline cellulose contained in the gas generant composition of the present embodiment is 2 cm 3 / g or more and 15 cm 3 / g or less, more preferably 3 to 10 cm 3 / g. If the apparent specific volume is 2 cm 3 / g or more, the moldability is improved. Since elastic recovery due to fibrous properties is manifested, the upper limit is at most 15 cm 3The value is / g. The apparent specific volume of crystalline cellulose is 2-4 cm³, where fluidity is improved. 3 / g is more preferable, 3.0-3.8cm 3 / g is even more preferable.

[0020] <Additives> The gas generating agent composition of this embodiment contains component (d) (additive) as an optional component in an amount of 20% by mass or less. Examples of additives include slag-forming agents, lubricants, neutralizing agents, and other known additives. A slag-forming agent is an additive that allows for easy filtration of the combustion residue generated after the combustion of a gas generating agent composition, and is added to prevent its release outside the inflator. Specific examples of slag-forming agents include, for example, silicon nitride, silicon carbide, silicon dioxide, silicates, aluminum oxide, titanium oxide, acid clay, clay, and other natural minerals. Lubricants are added to gas generating agent compositions during their preparation to improve the mixability and fluidity of the raw material components. Specific examples of lubricants include graphite, magnesium stearate, zinc stearate, calcium stearate, sodium stearate, boron nitride, highly dispersed silica (silicon dioxide), and talc. Examples of neutralizing agents include compounds containing one or more cations selected from alkali metals and alkaline earth metals. Such compounds include carbonates, silicates, nitrates, oxalates, peroxides, or oxides of alkali metals and alkaline earth metals, such as sodium carbonate, sodium silicate, sodium nitrate, sodium oxalate, strontium peroxide, calcium peroxide, magnesium oxide, strontium oxide, or calcium oxide. Other known additives include metal oxides such as cupric oxide, iron oxide, zinc oxide, cobalt oxide, manganese oxide, molybdenum oxide, nickel oxide, bismuth oxide, silica, and alumina; metal hydroxides such as aluminum hydroxide, magnesium hydroxide, cobalt hydroxide, and iron hydroxide; cobalt carbonate and calcium carbonate; complex compounds of metal oxides or hydroxides such as acid clay, kaolin, talc, bentonite, and diatomaceous earth; metal salts such as sodium silicate, mica molybdate, cobalt molybdate, and ammonium molybdate; molybdenum disulfide, calcium stearate, silicon nitride, silicon carbide, metaboric acid, boric acid, boric anhydride, and glass. The gas generating agent composition of this embodiment may preferably contain aluminum hydroxide (AlOH) as an additive.

[0021] The gas generating agent composition of this embodiment can be molded into a desired shape and used as a molded body (gas generating agent molded body) such as pellets, discs, spheres, rods, cylinders, single-hole cylinders, or porous cylinders, and pellets, single-hole cylinders, or porous cylinders are particularly preferred.

[0022] The gas generating agent composition of this embodiment can be applied, for example, to inflators for driver's side airbags, passenger side airbags, side airbags, inflators for inflatable curtains, knee bolsters, inflators for inflatable seat belts, inflators for tubular systems, or inflators for pretensioners in various vehicles. Among these, it is preferably applied to inflators for driver's side airbags, passenger side airbags, and side airbags, where rapid deployment is required and a short ignition time and sufficient combustion volume are particularly important.

[0023] The gas generating agent composition of this embodiment, or the inflator containing it, may be either a pyrotype, where the gas supply source is only the gas generating agent, or a hybrid type, where the gas supply source is both compressed gas such as argon and the gas generating agent.

[0024] The gas generating agent composition of this embodiment can also be used as an ignition agent, such as an enhancer (or booster), to transfer the energy of a detonator or squib to the gas generating agent.

[0025] The method for producing the gas generating agent composition of this embodiment is not particularly limited and can be produced by known methods or a combination of known methods. For example, it can be produced by preparing desired raw materials and mixing them. Specifically, it can be produced by a dry method in which each raw material is mixed in powder form, or by a wet method in which each raw material is mixed in the presence of water or an organic solvent. Furthermore, when using the gas generating agent composition as a molded body, the mixture obtained by the dry or wet method described above can be compressed and molded using a tablet press to obtain a molded body, or the mixture obtained by the wet method described above can be extruded using an extruder, then cut and dried to obtain a molded body. The manufacturing conditions in these methods for producing molded bodies are not particularly limited and can be set as appropriate depending on the purpose. [Examples]

[0026] The present invention will be specifically described below with reference to examples and comparative examples. First, we will explain the measurement methods and evaluation methods for each physical property used in the examples and comparative examples.

[0027] (1) Average degree of polymerization of crystalline cellulose powder (CEL) (―) The average degree of polymerization (-) of crystalline cellulose powder (CEL) was measured by the copper ethylenediamine solution viscosity method described in the 18th edition of the Japanese Pharmacopoeia, Identification Test for Crystalline Cellulose (3).

[0028] (2) Average particle size (μm) of crystalline cellulose powder (CEL) For crystalline cellulose, the weight-average particle diameter was used for CEL(A), CEL(B), CEL(C), CEL(D), CEL(F), and CEL(G), while the volume-average particle diameter was used for CEL(E). The weight-average particle size of crystalline cellulose was measured by sieving 10g of the sample for 10 minutes using a rotary sieve shaker (Hirakojo Co., Ltd., Sieve Shaker Type A) and a JIS standard sieve (Z8801-1987), and the particle size distribution was expressed as the particle size at 50% of the cumulative weight. The volume-average particle size of crystalline cellulose was determined using a laser diffraction / scattering particle size distribution analyzer (LA-950 V2 (product name), manufactured by Horiba, Ltd.). Approximately 1.0 g of cellulose powder was placed on a powder sample chute, and the sample was dispersed under conditions of feeder strength 160 and compressed air pressure 0.3 MPa. Scattered light measurements were performed within the range of 95% to 98% of the laser light (red) transmittance, and the particle size of 50% of the cumulative volume measured was defined as the average particle size D50.

[0029] (3) Apparent specific volume (cm³) of crystalline cellulose powder (CEL) 3 / g) 100cm 3 The powder sample was roughly packed into a glass graduated cylinder using a quantitative feeder over 2-3 minutes. The surface of the powder layer was then leveled horizontally with a soft brush, and its volume was read. This volume was then divided by the weight of the powder sample to determine the volume. The weight of the powder was calculated based on a volume of 70-100 cm³. 3 The appropriate level was determined as needed.

[0030] (4) Angle of repose (°) of crystalline cellulose powder (CEL) The dynamic fluidity of cellulose powder was measured when it was dropped into the slit at a rate of 3 g / min using a quantitative feeder, using a Sugihara-type angle of repose measuring device (slit size 10 mm depth x 50 mm width x 140 mm height, with a protractor placed at the 50 mm position). The angle between the bottom of the device and the cambium layer of the cellulose powder was defined as the angle of repose (°).

[0031] (5) Moldability of the gas generating agent composition After mixing each raw material of the gas generating agent composition, a specified amount (0.5g) was weighed, loaded into a tablet mold (φ14mm cylinder), and compressed and molded at a specified pressure (15MPa for 5 seconds, or 50MPa for 5 seconds). The moldability was evaluated according to the following criteria: (Evaluation Criteria) ◎: After molding at 15 MPa, the strength was sufficient for handling without any problems. ○: After molding at 50 MPa, the strength was sufficient for handling without any problems. △: Although demolding was successful, the product cracked or crumbled during handling after molding. ×: The molded product collapsed or chipped during demolding.

[0032] (6) Ignition properties of the gas generating agent composition After mixing each raw material of the gas generating agent composition, a specified amount (5.0g) was weighed, loaded into a tablet mold (φ14mm cylinder), and compressed and molded at a specified pressure (220MPa, 5 seconds). To ensure ignition and combustion only from the end face, the resulting gas generating agent pellets were coated twice with the epoxy resin adhesive "BondQuick 30" on the sides and one side. These gas generating agent pellets were placed in a sealed SUS (stainless steel) bomb (internal volume 1L), and the bomb was pressurized to 7MPa while purging nitrogen. After the bomb internal pressure stabilized, a voltage of 24V was applied to a nichrome wire (φ=0.4mm, length 120mm) in contact with the end face of the gas generating agent pellet, causing ignition and combustion due to the red-hot nichrome wire. The moment the voltage was applied was defined as T0, and the moment the internal pressure of the SUS sealed bomb rose as T1. The ignition properties were evaluated for the time from T0 to T1 according to the following criteria. Ignition properties were determined according to the following evaluation criteria: (Evaluation Criteria) ○: When a red-hot nichrome wire was brought into contact with the wire, it ignited immediately (in less than 1 second) after the voltage was applied. △: When the red-hot nichrome wire was brought into contact with the device, ignition was successful, but it took more than 1 second from the start of voltage application. ×: The red-hot nichrome wire did not ignite even when it was held in contact for more than 5 seconds.

[0033] (7) Combustion temperature (K) of the gas generating agent composition The combustion temperature was calculated using chemical equilibrium calculations (as described on page 12 of the Firearms and Ammunition Technology Handbook).

[0034] [Example 1] Using crystalline cellulose having the physical properties shown in Table 1 as a binder, the fuel, oxidizer, and additives were mixed in the proportions shown in Tables 2 and 3 below. The specified amount was loaded into a tablet press and compressed and molded at a pressure of 220 MPa for 5 seconds to obtain a cylindrical gas generating agent composition (molded body). The moldability of the obtained molded articles is shown in Table 2 below, and the ignition properties, combustion temperature, etc., are shown in Table 3 below.

[0035] [Example 2] A gas generating agent composition (molded body) was prepared in the same manner as in Example 1, except that CEL(D) was used instead of CEL(C) as a binder.

[0036] [Example 3] A gas generating agent composition (molded body) was prepared in the same manner as in Example 1, except that CEL(E) was used instead of CEL(C) as a binder.

[0037] [Example 4] A gas generating agent composition (molded body) was prepared in the same manner as in Example 1, except that CEL(F) was used instead of CEL(C) as a binder.

[0038] [Example 5] A gas generating agent composition (molded body) was prepared in the same manner as in Example 1, except that CEL(G) was used instead of CEL(C) as a binder.

[0039] [Example 6] A gas generating agent composition (molded body) was prepared in the same manner as in Example 1, except that the oxidizing agent content was changed to 35.0% and the additive content to 20.0%.

[0040] [Example 7] A gas generating agent composition (molded body) was prepared in the same manner as in Example 1, except that the fuel content was changed to 50.0%, the oxidizer content to 45.0%, and the additive content to 0.0%.

[0041] [Example 8] A gas generating agent composition (molded body) was prepared in the same manner as in Example 1, except that the fuel content was changed to 10.0%, the additive content to 0.0%, and the binder content to 40.0%.

[0042] [Example 9] A gas generating agent composition (molded body) was prepared in the same manner as in Example 1, except that the fuel was replaced with NQ at a concentration of 39.0%, the oxidizer with SrN at a concentration of 46.0%, and the additive concentration was changed to 10.0%.

[0043] [Example 10] A gas generating agent composition (molded body) was prepared in the same manner as in Example 1, except that the fuel was changed to NQ with a content of 46.0%, the oxidizer to PN with a content of 49.0%, and the additive content to 0.0%.

[0044] [Comparative Example 1] Without adding a binder, a gas generating agent composition (molded body) was prepared by mixing and compression molding the fuel, oxidizer, and additives as shown in Table 2 below, in the same manner as in Example 1.

[0045] [Comparative Example 2] Without adding a binder, a gas generating agent composition (molded body) was prepared by mixing and compression molding the fuel, oxidizer, and additives as shown in Table 2 below, in the same manner as in Example 1.

[0046] [Comparative Example 3] Without adding a binder, a gas generating agent composition (molded body) was prepared by mixing and compression molding the fuel and oxidizer as shown in Table 2 below, in the same manner as in Example 1.

[0047] [Comparative Example 4] A gas generating agent composition (molded body) was prepared in the same manner as in Example 1, except that the fuel was NQ with a content of 55.0%, the oxidizer content was 53.0%, and CEL(A) was used instead of CEL(C) as a binder.

[0048] [Comparative Example 5] A gas generating agent composition (molded article) was prepared in the same manner as in Comparative Example 4, except that CEL(B) was used instead of CEL(A) as a binder.

[0049] [Table 1]

[0050] [Table 2]

[0051] [Table 3]

[0052] In comparative examples 4 and 5, which used CEL(B) and CEL(A), respectively, crystalline celluloses with various physical properties exhibited chipping and cracking during handling after molding. On the other hand, Examples 1 to 5, which used CEL(C), CEL(D), CEL(E), CEL(F), and CEL(G), showed good moldability. In particular, Example 3 using CEL(E), Example 4 using CEL(F), and Example 5 using CEL(G) showed good moldability even under low-pressure molding conditions. Next, in gas generating agents containing various fuels and oxidizing agents, Examples 1, 9, and 10, which contain CEL(C), showed better moldability compared to Comparative Examples 1 to 3, which do not contain a binder. Next, in Example 6, which had a high content of the additive component AlOH, and in Example 7, which had a high content of the fuel component GN, good moldability was observed when CEL(C) was added. Furthermore, in Example 8, which had a high content of the binder component CEL(C), good moldability was also observed.

[0053] In a gas generating agent containing GN as fuel, BCN as an oxidizer, and AlOH as an additive, Comparative Example 6, which contained CMCNa, a binder component widely used in prior patents, exhibited poor ignition and a combustion temperature of 1738K. In contrast, Example 1, in which CMCNa was replaced with CEL(C), showed improved ignition and a reduction in combustion temperature to 1670K. In Comparative Example 7, a gas generating agent containing NQ as fuel, SrN as an oxidizer, and AlOH as an additive, which contained CMCNa as a binder component, ignition was good, but the combustion temperature was high at 2309K. In contrast, in Example 9, where CMCNa was replaced with CEL(C), it was confirmed that the combustion temperature could be significantly reduced to 2056K while maintaining good ignition. [Industrial applicability]

[0054] According to the method for producing a gas generating agent composition (explosives) of the present invention, by using crystalline cellulose having specific properties as a binder, it becomes possible to produce a gas generating agent composition (explosives) with excellent moldability, combustion temperature, and ignition properties, and the gas generating agent composition (explosives) itself can be suitably used in the field of gas generating agent compositions (explosives).

Claims

1. The following ingredients: (a) Fuel: 5% by mass or more and 55% by mass or less; (b) Oxidizing agent: 20% by mass or more and 70% by mass or less; (c) Binder: 0.5% by mass or more and 55% by mass or less; and (d) Additives as optional components: 20% by mass or less; A gas generating agent composition containing the above, wherein the (c) component (binder) comprises crystalline cellulose (CEL) with an average degree of polymerization of 100 to 350.

2. The gas generating agent composition according to claim 1, wherein the component (b) (oxidizing agent) comprises at least one selected from the group consisting of nitrates, basic metal nitrates, nitrites, and inorganic peroxides.

3. The gas generating agent composition according to claim 2, wherein the nitrate is basic copper nitrate (BCN), strontium nitrate (SrN), or potassium nitrate (PN).

4. The gas generating agent composition according to claim 1 or 2, wherein the component (a) (fuel) comprises at least one selected from the group consisting of guanidine nitrate (GN) and nitroguanidine (NQ).

5. The gas generating agent composition according to claim 1 or 2, wherein the component (d) (additive) comprises aluminum hydroxide (AlOH).

6. The gas generating agent composition according to claim 1 or 2, wherein the average particle size of the crystalline cellulose (CEL) is 15 μm or more and 250 μm or less.

7. The gas generating agent composition according to claim 1 or 2, wherein the angle of repose of the crystalline cellulose (CEL) is 30° or more and less than 65°.

8. The apparent specific volume of the crystalline cellulose (CEL) is 2 cm³. ３ / g or more 15cm ３ The gas generating agent composition according to claim 1 or 2, wherein the amount is less than or equal to / g.

9. The following ingredients: (a) Fuel: 5% by mass or more and 55% by mass or less; (b) Oxidizing agent: 20% by mass or more and 70% by mass or less; (c) Binder containing crystalline cellulose (CEL) with an average degree of polymerization of 100 to 350: 0.5% to 55% by mass; and (d) Additives as optional components: 20% by mass or less; A step of dry mixing to obtain a mixed powder; and A process of compressing and molding the resulting mixed powder as needed; A method for producing the gas generating agent composition according to claim 1 or 2, including the gas generating agent composition according to claim 1 or

10. A method for producing the gas generating agent composition according to claim 9, wherein the average particle size of the crystalline cellulose (CEL) is 15 μm or more and 250 μm or less.

11. A method for producing the gas generating agent composition according to claim 9 or 10, wherein the angle of repose of the crystalline cellulose (CEL) is 30° or more and less than 65°.

12. The apparent specific volume of the crystalline cellulose (CEL) is 2 cm³. ３ / g or more 15cm ３ A method for producing the gas generating agent composition according to claim 9 or 10, wherein the amount is less than or equal to / g.

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