US3197349A - Silicone propellant compositions containing nitroguanidine - Google Patents

Silicone propellant compositions containing nitroguanidine Download PDF

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US3197349A
US3197349A US259777A US25977763A US3197349A US 3197349 A US3197349 A US 3197349A US 259777 A US259777 A US 259777A US 25977763 A US25977763 A US 25977763A US 3197349 A US3197349 A US 3197349A
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propellant
perchlorate
weight
nitroguanidine
silicone resin
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US259777A
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Kuhn Klaus
Netzer Theodor
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Nitrochemie Aschau GmbH
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Nitrochemie Aschau GmbH
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    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B45/00—Compositions or products which are defined by structure or arrangement of component of product
    • C06B45/04—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive
    • C06B45/06—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive the solid solution or matrix containing an organic component
    • C06B45/10—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive the solid solution or matrix containing an organic component the organic component containing a resin

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  • the present invention mainly comprises a propellant composition
  • a propellant composition comprising a propellant which upon oxidation forms gas for propelling purposes (all normal propellants of this type being suitable for the purposes of the present invention), and an alkaline perchlorate as oxidation salt which serves as a source of oxygen for the propellant.
  • the oxidation salt of the present invention may be any alkaline perchlorate such as sodium perchlorate, potassium perchlorate, lithium perchlorate, etc., but most preferably is ammonium perchlorate.
  • the propellant and the perchlorate are distributed through a resin body which is stable at a temperature of 150 C. or more.
  • this resin body is made of a silicone resin.
  • the perchlorate should most desirably be present in the composition of the present invention in a major amount and the propellant in a minor amount.
  • the alkaline perchlorate is present in an amount of more than 50% by weight, most preferably about 60-70% by weight of the composition including the resin binding agent and the propellant.
  • the propellant compositions of the present invention remain stable at elevated temperatures, such as in the environment of a fire, and also at the high temperatures caused by high speeds, for example, in airplanes and rockets.
  • ammonium perchlorate as the alkaline perchlorate.
  • the volume of the gases of combustion can be further increased by using in addition to the alkaline perchlorate also nitroguanidine, preferably in an amount of 10-15% by weight of nitroguanidine, calculated with respect to the amount of perchlorate.
  • the most preferred binding agent according to the present invention is a silicone resin having a viscosity of about 30025G0 centistokes.
  • extinguishing devices are known in which the actual extingushing agent by pressure from gases of combustion is mixed therewith and is thereby warmed and is necessarily evaporated and in this manner reaches the site of the fire. Consequently, used liquid propellants, for example, gasoline and oxygen, have the disadvantage that they are separately contained in storage containers and for the purpose of producing the actual burning mixture are exactly dosed by means of conduits and valves and must be mixed before they can be ignited. Solid propellants are with respect to storage and handling less economical.
  • the contained constitutents as is known, which are unstable at the occurring high temperatures, and to some extent at least are decomposed, so that a uniform consumption cannot be obtained with assurance. This is particularly so with respect to the normally used binding agents.
  • ammonium nitrate is not suitable because at the temperatures which occur its crystalline structure undergoes change, and an ammonium nitrate-containing propellant composition for this reason exhibits changes in solidity upon increased temperature, which is undesired and disadvantageous.
  • the mixtures of ammonium perchlorate, and propellant, for example nitroguanidine, with silicone resin can be molded into solid propellant compositions according to: the present invention, which even at high temperatures are of stable form and always burn oif evenly. Moreover, the detona ting temperature of these mixtures is about 260 C., which is very high, and consequently the stability of the propellant composition at a temperature of 150 C. is extremely good for a prolonged period of time.
  • Example 1 A mixture is made of the following composition:
  • ammonium perchlorate, nitroguanidine and aluminum are thoroughly mixed for 20 minutes at room temperature in a kneading device. The mixture is then sifted through a 300a sieve.
  • the above amount of silicone oil is introduced into a kneading device heated to 86 C.
  • the sifted mixture in 4 equal portions is then introduced into the kneading device (under stirring), the first tlnee portions being introduced at 15 minute intervals.
  • the fourth and last portion is then added thereto, the mixture is subjected to a vacuum of about mm. Hg and kneading is continued for 120 minutes.
  • the hardener is then added and the kneading is continued for an additional five minutes.
  • the by now very viscous C. warm fiowable mass is introduced into an air-tight closable draining sas /gees pot over a sieve by means of an underpressure of about 70 mm. Hg. Then the mass is subjected to a nitrogen overpressure in the pot and thereby pressed into cardboard cartridges provided with a form.
  • the filled cartridges are then (according to the hardener addition) stored at 45 C. for 3 to 8 days, whereby the filled masses are hardened to removable bodies. After removing the cartridges and the projections the body is cut and wound into the form of a hollow cylinder, which if necessary can be provided on the front and the generated surface with an insulation of a normal silicone oil casting mass filled with oxide.
  • ammonium perchlorate, nitroguanidine and aluminum are thoroughly mixed at room temperature for minutes in a kneading device.
  • the mixture is then sifted through a sieve of 300;]. and again introduced into the kneading device.
  • the kneading device is then evacuated to 70 mm. Hg for 10 minutes, kneading is continued for 3 minutes and the silicone oil amount is suctioned into the kneading device.
  • the silicone oil addition is heated during 5 minutes to a 8690 C. and is kneaded for 45 hours.
  • the hardener is then added and the kneading is continued for an additional 5 minutes.
  • the filled cartridges are then (according to the hardener addition) stored for 3 to 8 days at (3., whereby the filled mass is hardened to windable bodies. After removing the cartridges and the projections the bodies are cut and wound into the desired form.
  • the invention as described before may further be varied in different ways.
  • ammonium perchlorate mentioned in the examples it is also possible to use as oxidizer the lithium, sodium or potassium salt of perchloric acid.
  • the silicon resin may be any alkyl polysiloxane such as methy-lpolysiloxane, ethylpolysiloxane or others or mixtures with each other.
  • the viscosity of the silicon resin should lie within a range of about 3002500 centistokes, but it is also possible to surpass these limits.
  • the amount of silicon resin added to the mixture should be between 10 and preferably 20 to 30% of the total composition.
  • Further ingredients that are added are aluminum powder preferably in a finely divided state and burning stabilisers such as phenanthrene (ortho-di-phenylene ethylene C H an-thracene (C HACHQC HU or other compounds known per se for this purpose.
  • stabilisers such as phenanthrene (ortho-di-phenylene ethylene C H an-thracene (C HACHQC HU or other compounds known per se for this purpose.
  • C HACHQC HU phenanthrene
  • C HACHQC HU tho-di-phenylene ethylene C H an-thracene
  • the grain size of the perchlorates used in the composition is preferably adjusted by grinding the product in an air separator.
  • a solid propellant composition adapted for use in fire extinguishing devices comprising a body of silicone resin stable at temperatures of at least 150 C. and having distributed therethrough as oxidizing salt at least one perchlorate selected from the group consisting of alkali metal perchlorates and ammonium perchlorate, and nitroguanidine as propellant which upon oxidation forms gas for propelling purposes, said oxidizing salt serving as a source of oxygen for said propellant.
  • a solid propellant composition adapted for use in fire extinguishing devices comprising a body of silicone resin stable at temperatures of at least 150 C. and having distributed therethrough as oxidizing salt at least one perchlorate selected from the group consisting of alkali metal perchlorates and ammonium perchlorate in an amount equal to between about 50% and of the weight of said propellant composition, and nitroguanidine as propellant which upon oxidation forms gas for propelling purposes in an amount equal to between about 10% and 15% of the weight of said perchlorate, said oxidizing salt serving as a source of oxygen for said propellant.
  • a solid propellant composition adapted for use in fire extinguishing devices comprising a body of silicone resin stable at temperatures of at least C. and having distributed therethrough ammonium perchlorate as oxidizing salt, and nitroguanidine as propellant which upon oxidation forms gas for propelling purposes, said oxidizing salt serving as a source of oxygen for said propellant.
  • a solid propellant composition adapted for use in fire extinguishing devices comprising a body of hardened silicone resin which is stable at temperatures of at least 150 C. and which in unhardened condition has a viscosity of between 300 and 2,500 centistokes, and having distributed therethrough as oxidizing salt at least one perchlorate selected from the group consisting of alkali metal perchlorates and ammonium perchlorate, and nitroguanidine as propellant which upon oxidation forms gas for propelling purposes, said oxidizing salt serving as a source of oxygen for said propellant.
  • a solid propellant composition adapted for use in fire extinguishing devices comprising a body of silicone resin stable at temperatures ⁇ 23 of at least 150 C. and having distributed therethrough as oxidizing salt at least one perchlorate selected from the group consisting of alkali metal perchlorates and ammonium perchlorate in an amount equal to between about 60% and 70% of the weight of said propellant composition, and nitroguanidine as propellant which upon oxidation forms gas for propelling purposes in an amount equal to between about and of the weight of said perchlorate, said oxidizing salt serving as a source of oxygen for said propellant.
  • a solid propellant composition adapted for use in fire extinguishing devices comprising a body of hardened silicone resin which is stable at temperatures of at least 150 C. and which in unhardened condition has a viscosity of between 300 and 2,500 centistokes, said body of silicone resin constituting between about 20% and 30% of the weight of said propellant composition and having distributed therethrough ammonium perchlorate in an amount equal to between 50% and 70% of the weight of said propellant composition, and as propellant which upon oxidation forms gas for propellins purposes, nitroguanidine in an amount equal to between about 10% and 15% of the weight of said ammonium perchlorate, said ammonium perchlorate serving as a source of oxygen for said propellant.
  • a method of forming a solid propellant composition adapted for use in fire extinguishing devices comprising mix'mg nitroguanidine as a propellant which upon oxidation forms gas for propelling purposes, and a perchlorate selected from the group consisting of alkaline metal perchlorates and ammonium perchlorate as an oxidation salt which serves as source of oxygen for said propellant, with an unhardened silicone resin adapted to form upon hardening a solid resin body stable at temperatures of at least 150 C.; casting the thusformed mixture in a mold of predetermined shape; and hardening said silicone resin, thereby obtaining a silicone resin body having said propellant and said oxidation salt distributed therethrough.
  • a method of forming a solid propellant composition adapted for use in fire extinguishing devices comprising mixing nitroguanidine as a propellant which upon oxidation forms gas for propelling purposes, and ammonium perchlorate as an oxidation salt which serves as a source of oxygen for said propellant with an unhardened silicone resin adapted to form upon hardening a solid resin body stable at temperatures of at least 150 C.; casting the thus-formed mixture in a mold of predetermined shape; and hardening said silicone resin, thereby obtaining a silicone resin body having said propellant and said oxidation salt distributed therethrough.
  • a method of forming a solid propellant composition adapted for use in fire extinguishing devices comprising mixing nitroguanidine as a propellant which upon oxidation forms gas for propelling purposes, and a perchlorate selected from the group consisting of alkali metal perchlorates and ammonium perchlorate as an oxidation salt which serves as source of oxygen for said propellant with an unhardened silicone resin having a viscosity of between about 300 and 2,500 centistokes and adapted to form upon hardening a solid resin body stable at temperatures of at least 150 C.; casting the thusformed mixture in a mold of predetermined shape; and hardening said silicone resin, thereby obtaining a silicone resin body having said propellant and said oxidation salt distributed therethrough.
  • a method of forming a solid propellant composition adapted for use in fire extinguishing devices comprising mixing a perchlorate selected from the group consisting of alkali metal perchlorates and ammonium perchlorate in an amount of between about 50% and of the weight of said propellant composition, and nitroguanidine in an amount of between about 10% and 15% of the weight of said perchlorate, said nitroguanidine serving as a propellant which upon oxidation forms gas for propelling purposes, and said perchlorate serving as an oxidation salt which serves a source of oxygen for said propellant, with between about 20% and 30% of the weight of said propellant composition of an unhardened silicone resin having a viscosity of between 300 and 2,500 centistokes and being adapted to form upon hardening a solid resin body stable at temperatures of at least C.; casting the thus-formed mixture in a mold of predetermined shape; and hardening said silicone resin, thereby obtaining a silicone resin body having said propellant and said oxidation salt distributed
  • a method of forming a solid propellant composition adapted for use in fire extinguishing devices comprising mixing a perchlorate selected from the group consisting of alkali metal perchlorates and ammonium perchlorate in an amount of between about 50% and 70% of the weight of said propellant composition, aluminum powder in an amount of between 1% and 5% of the weight of said propellant composition, and nitroguanidine in an amount of between about 10% and 15% of the weight of said perchlorate, said nitroguanidine serving as a propellant which upon oxidation forms gas for propelling purposes, and said perchlorate serving as an oxidation salt which serves a source of oxygen for said propellant, with between about 20% and 30% of the weight of said propellant composition of an unhardened silicone resin having a viscosity of between 300 and 2,500 centistokes and being adapted to form upon hardening a solid resin body stable at temperatures of at least 150 C.; casting the thus-formed mixture in a mold of predetermined shape; and hardening said

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Description

United States Patent 3,197,349 SilLli-CQNE PROPELLANT COMPOSITIONS CUNTATNTN F lTTRGGUANTDTNE Kiaus Kuhn, Essen-Tiredeney, and Theodor Netzer, Pool:- ing, Eitarnberg, Germany, assignors to Nitrochemie G.rn.h.H., Aschau, near Kraiburg, German No Drawing. Fiied Feb. 15, 1963, Ser. No. 259,777 12 Ciairns. (Cl. l49-19) The present invention relates to propellant compositions, more particularly to propellant compositions of the solid fuel type, and still more particularly to propellant compositions which are also useful in extinguishers and extinguishing devices.
It is a primary object of the present invention to provide propellant compositions of the solid fuel type in which the oxidation agent present acts as a stable source of oxygen supply.
it is another object of the present invention to provide solid propellant compositions of superior stability which can consequently be used for purposes for which known solid propellant compositions could not be used.
Other objects and advantages of the present invention will be apparent from a further reading of the specification and of the appended claims.
With the above and other objects in View, the present invention mainly comprises a propellant composition comprising a propellant which upon oxidation forms gas for propelling purposes (all normal propellants of this type being suitable for the purposes of the present invention), and an alkaline perchlorate as oxidation salt which serves as a source of oxygen for the propellant.
The oxidation salt of the present invention may be any alkaline perchlorate such as sodium perchlorate, potassium perchlorate, lithium perchlorate, etc., but most preferably is ammonium perchlorate.
In accordance with the present invention the propellant and the perchlorate are distributed through a resin body which is stable at a temperature of 150 C. or more. In accordance with the preferred embodiment of the present invention this resin body is made of a silicone resin.
The perchlorate should most desirably be present in the composition of the present invention in a major amount and the propellant in a minor amount. Preferably the alkaline perchlorate is present in an amount of more than 50% by weight, most preferably about 60-70% by weight of the composition including the resin binding agent and the propellant.
The propellant compositions of the present invention remain stable at elevated temperatures, such as in the environment of a fire, and also at the high temperatures caused by high speeds, for example, in airplanes and rockets.
This is achieved according to the present invention by the use of an alkaline perchlorate as oxidation salt in the propellant composition and also by the use of a silicone resin as the hinder, the propellant and the alkaline perchlorate being thoroughly mixed into the silicone resin and the same molded into any desired form.
In extinguishing methods in which in addition to the tire extinguishing agent there is directed onto the site of the fire the greatest possible amount of gases of combustion, it is advantageous to use ammonium perchlorate as the alkaline perchlorate. The volume of the gases of combustion can be further increased by using in addition to the alkaline perchlorate also nitroguanidine, preferably in an amount of 10-15% by weight of nitroguanidine, calculated with respect to the amount of perchlorate. The most preferred binding agent according to the present invention is a silicone resin having a viscosity of about 30025G0 centistokes.
Particularly in the case of airplanes and the like extinguishing devices are known in which the actual extingushing agent by pressure from gases of combustion is mixed therewith and is thereby warmed and is necessarily evaporated and in this manner reaches the site of the fire. Consequently, used liquid propellants, for example, gasoline and oxygen, have the disadvantage that they are separately contained in storage containers and for the purpose of producing the actual burning mixture are exactly dosed by means of conduits and valves and must be mixed before they can be ignited. Solid propellants are with respect to storage and handling less economical. The contained constitutents, as is known, which are unstable at the occurring high temperatures, and to some extent at least are decomposed, so that a uniform consumption cannot be obtained with assurance. This is particularly so with respect to the normally used binding agents.
It is not possible for the purposes of the present invention to use as oxygen carrier any suitable salt because of the question of temperature stability. For example ammonium nitrate is not suitable because at the temperatures which occur its crystalline structure undergoes change, and an ammonium nitrate-containing propellant composition for this reason exhibits changes in solidity upon increased temperature, which is undesired and disadvantageous.
The mixtures of ammonium perchlorate, and propellant, for example nitroguanidine, with silicone resin, can be molded into solid propellant compositions according to: the present invention, which even at high temperatures are of stable form and always burn oif evenly. Moreover, the detona ting temperature of these mixtures is about 260 C., which is very high, and consequently the stability of the propellant composition at a temperature of 150 C. is extremely good for a prolonged period of time.
The following examples are given to further illustrate the present invention. The scope of the invention is not, however, meant to be limited to the specific details of the examples.
Example 1 A mixture is made of the following composition:
62. )O% by weight ammonium perchlorate, grain size 6.00% by weight nitroguanidine 29.00% by weight silicone oil (750 centistokes) (methyl polysiloxane) 1.00% by weight aluminum R130 (finely divided aluminum powder) 2.00% by weight phenanthrene (C I-I There is added thereto 2.5% by weight (calculated with respect to the amount of silicone oil) of hardener T (alkyl silicate) and 0.5% by weight (calculated with respect to the amount of silicone oil) of hardener T (alkyl silicate) The molded body is formed as follows:
The above given amounts of ammonium perchlorate, nitroguanidine and aluminum are thoroughly mixed for 20 minutes at room temperature in a kneading device. The mixture is then sifted through a 300a sieve.
The above amount of silicone oil is introduced into a kneading device heated to 86 C. The sifted mixture in 4 equal portions is then introduced into the kneading device (under stirring), the first tlnee portions being introduced at 15 minute intervals. The fourth and last portion is then added thereto, the mixture is subjected to a vacuum of about mm. Hg and kneading is continued for 120 minutes. The hardener is then added and the kneading is continued for an additional five minutes. The by now very viscous C. warm fiowable mass is introduced into an air-tight closable draining sas /gees pot over a sieve by means of an underpressure of about 70 mm. Hg. Then the mass is subjected to a nitrogen overpressure in the pot and thereby pressed into cardboard cartridges provided with a form.
The filled cartridges are then (according to the hardener addition) stored at 45 C. for 3 to 8 days, whereby the filled masses are hardened to removable bodies. After removing the cartridges and the projections the body is cut and wound into the form of a hollow cylinder, which if necessary can be provided on the front and the generated surface with an insulation of a normal silicone oil casting mass filled with oxide.
plus
2.5% by weight (calculated with respect to the silicone oil of hardener T (alkyl silicate) and 0.5% by Weight (calculated with respect to the silicone oil) of hardener T (alkyl silicate) The formation of the propellant composition proceeds as in Example 1.
Example 3 Composition:
31.5% by weight ammonium perchlorate, 60 200 grain size 31.5% by weight ammonium perchlorate (wind sifter,
12,000 r.p.m./lg5) 7.0% by weight nitroguanidine 29.0% by weight silicone oil (750 centistokes) (methyl polysiloxane) 1.0% by weight aluminum R130 (finely divided aluminum powder) plus 3.0% by weight (calculated with respect to the amount of silicone oil) of hardener T (alkyl silicate) The molded body is formed as follows:
The above given amounts of ammonium perchlorate, nitroguanidine and aluminum are thoroughly mixed at room temperature for minutes in a kneading device. The mixture is then sifted through a sieve of 300;]. and again introduced into the kneading device. The kneading device is then evacuated to 70 mm. Hg for 10 minutes, kneading is continued for 3 minutes and the silicone oil amount is suctioned into the kneading device. The silicone oil addition is heated during 5 minutes to a 8690 C. and is kneaded for 45 hours. The hardener is then added and the kneading is continued for an additional 5 minutes.
The very viscous 85 C. Warm fiowable mass is introduced into an air-tight dispensing pot over a sieve by means of underpressure (70 mm. Hg). The mass is then pressed into cardboard cartridges provided with projections using a nitrogen overpressure of 3 atmospheres in the pot.
The filled cartridges are then (according to the hardener addition) stored for 3 to 8 days at (3., whereby the filled mass is hardened to windable bodies. After removing the cartridges and the projections the bodies are cut and wound into the desired form.
Without any further analysis, the foregoing will so fully reveal the gist of the present invention that others can be applying current knowledge readily adapt it for various applications without omitting features that,
from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims. The invention as described before may further be varied in different ways. instead of ammonium perchlorate mentioned in the examples it is also possible to use as oxidizer the lithium, sodium or potassium salt of perchloric acid. The silicon resin may be any alkyl polysiloxane such as methy-lpolysiloxane, ethylpolysiloxane or others or mixtures with each other. The viscosity of the silicon resin should lie within a range of about 3002500 centistokes, but it is also possible to surpass these limits. The amount of silicon resin added to the mixture should be between 10 and preferably 20 to 30% of the total composition. Further ingredients that are added are aluminum powder preferably in a finely divided state and burning stabilisers such as phenanthrene (ortho-di-phenylene ethylene C H an-thracene (C HACHQC HU or other compounds known per se for this purpose. For hardening the silicon resin containing mixtures are especially used hardeners on basis of alkyl silicates such as methyl silicates, ethylsilicates or mixtures; but it is also possible to add other known hardeners. The grain size of the perchlorates used in the composition is preferably adjusted by grinding the product in an air separator.
What is claimed as new and desired to be secured by Letters Patent is:
1. A solid propellant composition adapted for use in fire extinguishing devices, said propellant composition comprising a body of silicone resin stable at temperatures of at least 150 C. and having distributed therethrough as oxidizing salt at least one perchlorate selected from the group consisting of alkali metal perchlorates and ammonium perchlorate, and nitroguanidine as propellant which upon oxidation forms gas for propelling purposes, said oxidizing salt serving as a source of oxygen for said propellant.
2. A solid propellant composition adapted for use in fire extinguishing devices, said propellant composition comprising a body of silicone resin stable at temperatures of at least 150 C. and having distributed therethrough as oxidizing salt at least one perchlorate selected from the group consisting of alkali metal perchlorates and ammonium perchlorate in an amount equal to between about 50% and of the weight of said propellant composition, and nitroguanidine as propellant which upon oxidation forms gas for propelling purposes in an amount equal to between about 10% and 15% of the weight of said perchlorate, said oxidizing salt serving as a source of oxygen for said propellant.
3. A solid propellant composition adapted for use in fire extinguishing devices, said propellant composition comprising a body of silicone resin stable at temperatures of at least C. and having distributed therethrough ammonium perchlorate as oxidizing salt, and nitroguanidine as propellant which upon oxidation forms gas for propelling purposes, said oxidizing salt serving as a source of oxygen for said propellant.
4. A solid propellant composition adapted for use in fire extinguishing devices, said propellant composition comprising a body of hardened silicone resin which is stable at temperatures of at least 150 C. and which in unhardened condition has a viscosity of between 300 and 2,500 centistokes, and having distributed therethrough as oxidizing salt at least one perchlorate selected from the group consisting of alkali metal perchlorates and ammonium perchlorate, and nitroguanidine as propellant which upon oxidation forms gas for propelling purposes, said oxidizing salt serving as a source of oxygen for said propellant.
5. A solid propellant composition adapted for use in fire extinguishing devices, said propellant composition comprising a body of silicone resin stable at temperatures {23 of at least 150 C. and having distributed therethrough as oxidizing salt at least one perchlorate selected from the group consisting of alkali metal perchlorates and ammonium perchlorate in an amount equal to between about 60% and 70% of the weight of said propellant composition, and nitroguanidine as propellant which upon oxidation forms gas for propelling purposes in an amount equal to between about and of the weight of said perchlorate, said oxidizing salt serving as a source of oxygen for said propellant.
6. A solid propellant composition according to claim 1 wherein said silicone resin constitutes between about and of the weight of said composition.
7. A solid propellant composition adapted for use in fire extinguishing devices, said propellant composition comprising a body of hardened silicone resin which is stable at temperatures of at least 150 C. and which in unhardened condition has a viscosity of between 300 and 2,500 centistokes, said body of silicone resin constituting between about 20% and 30% of the weight of said propellant composition and having distributed therethrough ammonium perchlorate in an amount equal to between 50% and 70% of the weight of said propellant composition, and as propellant which upon oxidation forms gas for propellins purposes, nitroguanidine in an amount equal to between about 10% and 15% of the weight of said ammonium perchlorate, said ammonium perchlorate serving as a source of oxygen for said propellant.
0. A method of forming a solid propellant composition adapted for use in fire extinguishing devices, said method comprising mix'mg nitroguanidine as a propellant which upon oxidation forms gas for propelling purposes, and a perchlorate selected from the group consisting of alkaline metal perchlorates and ammonium perchlorate as an oxidation salt which serves as source of oxygen for said propellant, with an unhardened silicone resin adapted to form upon hardening a solid resin body stable at temperatures of at least 150 C.; casting the thusformed mixture in a mold of predetermined shape; and hardening said silicone resin, thereby obtaining a silicone resin body having said propellant and said oxidation salt distributed therethrough.
9. A method of forming a solid propellant composition adapted for use in fire extinguishing devices, said method comprising mixing nitroguanidine as a propellant which upon oxidation forms gas for propelling purposes, and ammonium perchlorate as an oxidation salt which serves as a source of oxygen for said propellant with an unhardened silicone resin adapted to form upon hardening a solid resin body stable at temperatures of at least 150 C.; casting the thus-formed mixture in a mold of predetermined shape; and hardening said silicone resin, thereby obtaining a silicone resin body having said propellant and said oxidation salt distributed therethrough.
10. A method of forming a solid propellant composition adapted for use in fire extinguishing devices, said method comprising mixing nitroguanidine as a propellant which upon oxidation forms gas for propelling purposes, and a perchlorate selected from the group consisting of alkali metal perchlorates and ammonium perchlorate as an oxidation salt which serves as source of oxygen for said propellant with an unhardened silicone resin having a viscosity of between about 300 and 2,500 centistokes and adapted to form upon hardening a solid resin body stable at temperatures of at least 150 C.; casting the thusformed mixture in a mold of predetermined shape; and hardening said silicone resin, thereby obtaining a silicone resin body having said propellant and said oxidation salt distributed therethrough.
11. A method of forming a solid propellant composition adapted for use in fire extinguishing devices, said method comprising mixing a perchlorate selected from the group consisting of alkali metal perchlorates and ammonium perchlorate in an amount of between about 50% and of the weight of said propellant composition, and nitroguanidine in an amount of between about 10% and 15% of the weight of said perchlorate, said nitroguanidine serving as a propellant which upon oxidation forms gas for propelling purposes, and said perchlorate serving as an oxidation salt which serves a source of oxygen for said propellant, with between about 20% and 30% of the weight of said propellant composition of an unhardened silicone resin having a viscosity of between 300 and 2,500 centistokes and being adapted to form upon hardening a solid resin body stable at temperatures of at least C.; casting the thus-formed mixture in a mold of predetermined shape; and hardening said silicone resin, thereby obtaining a silicone resin body having said propellant and said oxidation salt distributed therethrough.
12. A method of forming a solid propellant composition adapted for use in fire extinguishing devices, said method comprising mixing a perchlorate selected from the group consisting of alkali metal perchlorates and ammonium perchlorate in an amount of between about 50% and 70% of the weight of said propellant composition, aluminum powder in an amount of between 1% and 5% of the weight of said propellant composition, and nitroguanidine in an amount of between about 10% and 15% of the weight of said perchlorate, said nitroguanidine serving as a propellant which upon oxidation forms gas for propelling purposes, and said perchlorate serving as an oxidation salt which serves a source of oxygen for said propellant, with between about 20% and 30% of the weight of said propellant composition of an unhardened silicone resin having a viscosity of between 300 and 2,500 centistokes and being adapted to form upon hardening a solid resin body stable at temperatures of at least 150 C.; casting the thus-formed mixture in a mold of predetermined shape; and hardening said silicone resin, thereby obtaining a silicone resin body having said propellant and said oxidation salt distributed therethrough.
References Cited by the Examiner UNITED STATES PATENTS 2,949,352 8/60 Cramer 14919 3,014,796 12/61 Long et al. 149-19 3,022,149 2/62 Cramer 149-19 3,031,347 4/62 Philipson 14919 X CARL D. QUARFORTH, Primary Examiner.

Claims (1)

1. A SOLID PROPELLANT COMPOSITION ADAPTED FOR USE IN FIRE EXTINGUISHING DEVICES, SAID PROPELLANT COMPOSITION COMPRISING A BODY OF SILICONE RESIN STABLE AT TEMPERATURES OF AT LEAST 150*C. AND HAVING DISTRIBUTED THERETHROUGH AS OXIDIZING SALT AT LEAST ONE PERCHLORATE SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL PERCHLOATES AND AMMONIUM PERCHLORATE, AND NITROGUANIDINE AS PROPELLANT WHICH UPON OXIDATION FORMS GAS FOR PROPELLING PURPOSES, SAID OXIDIZING SALT SERVING AS A SOURCE OF OXYGEN FOR SAID PROPELLANT.
US259777A 1963-02-15 1963-02-15 Silicone propellant compositions containing nitroguanidine Expired - Lifetime US3197349A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3711344A (en) * 1970-09-23 1973-01-16 Us Army Processing of crosslinked nitrocellulose propellants
US3964256A (en) * 1972-10-17 1976-06-22 Societe Nationale Des Poudres Et Explosifs Production of non-toxic gas by combustion of solid propellant
US3986908A (en) * 1972-07-05 1976-10-19 Societe Nationale Des Poudres Et Explosifs Composite propellants with a cellulose acetate binder
US4210474A (en) * 1978-10-16 1980-07-01 Nasa Silicone containing solid propellant
US6841015B1 (en) 2003-10-09 2005-01-11 The United States Of America As Represented By The Secretary Of The Navy Delay element and ignition composition

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2949352A (en) * 1956-10-01 1960-08-16 North American Aviation Inc Propellant composition
US3014796A (en) * 1945-08-22 1961-12-26 Monsanto Chemicals Solid composite propellants containing chlorinated polyphenols and method of preparation
US3022149A (en) * 1957-11-29 1962-02-20 North American Aviation Inc Process for dispersing solids in polymeric propellent fuel binders
US3031347A (en) * 1951-02-05 1962-04-24 Aerojet General Co Slow burning solid composite propellant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3014796A (en) * 1945-08-22 1961-12-26 Monsanto Chemicals Solid composite propellants containing chlorinated polyphenols and method of preparation
US3031347A (en) * 1951-02-05 1962-04-24 Aerojet General Co Slow burning solid composite propellant
US2949352A (en) * 1956-10-01 1960-08-16 North American Aviation Inc Propellant composition
US3022149A (en) * 1957-11-29 1962-02-20 North American Aviation Inc Process for dispersing solids in polymeric propellent fuel binders

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3711344A (en) * 1970-09-23 1973-01-16 Us Army Processing of crosslinked nitrocellulose propellants
US3986908A (en) * 1972-07-05 1976-10-19 Societe Nationale Des Poudres Et Explosifs Composite propellants with a cellulose acetate binder
US3964256A (en) * 1972-10-17 1976-06-22 Societe Nationale Des Poudres Et Explosifs Production of non-toxic gas by combustion of solid propellant
US4210474A (en) * 1978-10-16 1980-07-01 Nasa Silicone containing solid propellant
US6841015B1 (en) 2003-10-09 2005-01-11 The United States Of America As Represented By The Secretary Of The Navy Delay element and ignition composition

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