GB2315744A - Production of double-base propergol propellant blocks - Google Patents
Production of double-base propergol propellant blocks Download PDFInfo
- Publication number
- GB2315744A GB2315744A GB8210890A GB8210890A GB2315744A GB 2315744 A GB2315744 A GB 2315744A GB 8210890 A GB8210890 A GB 8210890A GB 8210890 A GB8210890 A GB 8210890A GB 2315744 A GB2315744 A GB 2315744A
- Authority
- GB
- United Kingdom
- Prior art keywords
- weight
- copper
- lead
- salt
- nitramine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003380 propellant Substances 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title description 4
- 239000000843 powder Substances 0.000 claims abstract description 33
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229920001220 nitrocellulos Polymers 0.000 claims abstract description 22
- 239000000020 Nitrocellulose Substances 0.000 claims abstract description 21
- POCJOGNVFHPZNS-ZJUUUORDSA-N (6S,7R)-2-azaspiro[5.5]undecan-7-ol Chemical compound O[C@@H]1CCCC[C@]11CNCCC1 POCJOGNVFHPZNS-ZJUUUORDSA-N 0.000 claims abstract description 20
- BSPUVYFGURDFHE-UHFFFAOYSA-N Nitramine Natural products CC1C(O)CCC2CCCNC12 BSPUVYFGURDFHE-UHFFFAOYSA-N 0.000 claims abstract description 20
- POCJOGNVFHPZNS-UHFFFAOYSA-N isonitramine Natural products OC1CCCCC11CNCCC1 POCJOGNVFHPZNS-UHFFFAOYSA-N 0.000 claims abstract description 20
- 125000003118 aryl group Chemical group 0.000 claims abstract description 19
- 150000003839 salts Chemical class 0.000 claims abstract description 18
- 239000003054 catalyst Substances 0.000 claims abstract description 16
- SNIOPGDIGTZGOP-UHFFFAOYSA-N Nitroglycerin Chemical compound [O-][N+](=O)OCC(O[N+]([O-])=O)CO[N+]([O-])=O SNIOPGDIGTZGOP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229960003711 glyceryl trinitrate Drugs 0.000 claims abstract description 15
- 150000002148 esters Chemical class 0.000 claims abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 14
- 238000002485 combustion reaction Methods 0.000 claims abstract description 13
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000006230 acetylene black Substances 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- UZGLIIJVICEWHF-UHFFFAOYSA-N octogen Chemical compound [O-][N+](=O)N1CN([N+]([O-])=O)CN([N+]([O-])=O)CN([N+]([O-])=O)C1 UZGLIIJVICEWHF-UHFFFAOYSA-N 0.000 claims abstract description 10
- XTFIVUDBNACUBN-UHFFFAOYSA-N 1,3,5-trinitro-1,3,5-triazinane Chemical compound [O-][N+](=O)N1CN([N+]([O-])=O)CN([N+]([O-])=O)C1 XTFIVUDBNACUBN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000028 HMX Substances 0.000 claims abstract description 9
- 125000001931 aliphatic group Chemical group 0.000 claims abstract description 8
- 150000001879 copper Chemical class 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 36
- 239000000203 mixture Substances 0.000 claims description 27
- 239000004014 plasticizer Substances 0.000 claims description 19
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims description 13
- RUKISNQKOIKZGT-UHFFFAOYSA-N 2-nitrodiphenylamine Chemical compound [O-][N+](=O)C1=CC=CC=C1NC1=CC=CC=C1 RUKISNQKOIKZGT-UHFFFAOYSA-N 0.000 claims description 12
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 claims description 12
- URAYPUMNDPQOKB-UHFFFAOYSA-N triacetin Chemical compound CC(=O)OCC(OC(C)=O)COC(C)=O URAYPUMNDPQOKB-UHFFFAOYSA-N 0.000 claims description 12
- CMRVDFLZXRTMTH-UHFFFAOYSA-L copper;2-carboxyphenolate Chemical compound [Cu+2].OC1=CC=CC=C1C([O-])=O.OC1=CC=CC=C1C([O-])=O CMRVDFLZXRTMTH-UHFFFAOYSA-L 0.000 claims description 11
- SEKCXMNFUDONGJ-UHFFFAOYSA-L copper;2-ethylhexanoate Chemical group [Cu+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O SEKCXMNFUDONGJ-UHFFFAOYSA-L 0.000 claims description 10
- 239000003381 stabilizer Substances 0.000 claims description 10
- SJOCPYUKFOTDAN-ZSOIEALJSA-N methyl (4z)-4-hydroxyimino-6,6-dimethyl-3-methylsulfanyl-5,7-dihydro-2-benzothiophene-1-carboxylate Chemical group C1C(C)(C)C\C(=N\O)C=2C1=C(C(=O)OC)SC=2SC SJOCPYUKFOTDAN-ZSOIEALJSA-N 0.000 claims description 8
- 235000013773 glyceryl triacetate Nutrition 0.000 claims description 6
- 239000001087 glyceryl triacetate Substances 0.000 claims description 6
- 229960002622 triacetin Drugs 0.000 claims description 6
- JXSRRBVHLUJJFC-UHFFFAOYSA-N 7-amino-2-methylsulfanyl-[1,2,4]triazolo[1,5-a]pyrimidine-6-carbonitrile Chemical compound N1=CC(C#N)=C(N)N2N=C(SC)N=C21 JXSRRBVHLUJJFC-UHFFFAOYSA-N 0.000 claims description 3
- VNZQQAVATKSIBR-UHFFFAOYSA-L copper;octanoate Chemical compound [Cu+2].CCCCCCCC([O-])=O.CCCCCCCC([O-])=O VNZQQAVATKSIBR-UHFFFAOYSA-L 0.000 claims description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 3
- LLVFMJQPUWTQTM-UHFFFAOYSA-M 2-carboxy-5-hydroxyphenolate;lead(2+) Chemical compound [Pb+2].OC1=CC=C(C([O-])=O)C(O)=C1 LLVFMJQPUWTQTM-UHFFFAOYSA-M 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims 7
- 239000004615 ingredient Substances 0.000 claims 1
- PZIMIYVOZBTARW-UHFFFAOYSA-N centralite Chemical compound C=1C=CC=CC=1N(CC)C(=O)N(CC)C1=CC=CC=C1 PZIMIYVOZBTARW-UHFFFAOYSA-N 0.000 description 2
- OYVYCHSRRKLRPN-UHFFFAOYSA-N 2-(hydroxymethyl)propane-1,3-diol nitric acid Chemical compound [N+](=O)(O)[O-].[N+](=O)(O)[O-].C(O)C(CO)CO OYVYCHSRRKLRPN-UHFFFAOYSA-N 0.000 description 1
- OBETXYAYXDNJHR-UHFFFAOYSA-N 2-Ethylhexanoic acid Chemical compound CCCCC(CC)C(O)=O OBETXYAYXDNJHR-UHFFFAOYSA-N 0.000 description 1
- UIAFKZKHHVMJGS-UHFFFAOYSA-M 2-carboxy-5-hydroxyphenolate Chemical compound OC1=CC=C(C([O-])=O)C(O)=C1 UIAFKZKHHVMJGS-UHFFFAOYSA-M 0.000 description 1
- YQUVCSBJEUQKSH-UHFFFAOYSA-N 3,4-dihydroxybenzoic acid Chemical compound OC(=O)C1=CC=C(O)C(O)=C1 YQUVCSBJEUQKSH-UHFFFAOYSA-N 0.000 description 1
- FAANYWPIFFHMFZ-UHFFFAOYSA-N C#C.C(CCCCCCCCCCCCCCCCC)(=O)O Chemical group C#C.C(CCCCCCCCCCCCCCCCC)(=O)O FAANYWPIFFHMFZ-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- QQKUDWAZRXJINS-UHFFFAOYSA-N [N+](=O)(O)[O-].[N+](=O)(O)[O-].C(O)C(C)(CO)CO Chemical compound [N+](=O)(O)[O-].[N+](=O)(O)[O-].C(O)C(C)(CO)CO QQKUDWAZRXJINS-UHFFFAOYSA-N 0.000 description 1
- CNVULGHYDPMIHD-UHFFFAOYSA-L bis[(2-hydroxybenzoyl)oxy]lead Chemical compound [Pb+2].OC1=CC=CC=C1C([O-])=O.OC1=CC=CC=C1C([O-])=O CNVULGHYDPMIHD-UHFFFAOYSA-L 0.000 description 1
- SHZIWNPUGXLXDT-UHFFFAOYSA-N caproic acid ethyl ester Natural products CCCCCC(=O)OCC SHZIWNPUGXLXDT-UHFFFAOYSA-N 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- YMQPOZUUTMLSEK-UHFFFAOYSA-L lead(2+);octanoate Chemical compound [Pb+2].CCCCCCCC([O-])=O.CCCCCCCC([O-])=O YMQPOZUUTMLSEK-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 238000007582 slurry-cast process Methods 0.000 description 1
- AGCQZYRSTIRJFM-UHFFFAOYSA-N triethylene glycol dinitrate Chemical compound [O-][N+](=O)OCCOCCOCCO[N+]([O-])=O AGCQZYRSTIRJFM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B25/00—Compositions containing a nitrated organic compound
- C06B25/18—Compositions containing a nitrated organic compound the compound being nitrocellulose present as 10% or more by weight of the total composition
- C06B25/24—Compositions containing a nitrated organic compound the compound being nitrocellulose present as 10% or more by weight of the total composition with nitroglycerine
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B23/00—Compositions characterised by non-explosive or non-thermic constituents
- C06B23/007—Ballistic modifiers, burning rate catalysts, burning rate depressing agents, e.g. for gas generating
Abstract
The propellant blocks are produced from a base powder comprising nitrocellulose (of nitrogen content 11.5 to 13% by weight), a nitramine (octogen and/or hexogen) and a combustion catalyst system. The base powder is gelatinised in a mould at an elevated temperature by means of a nitric ester (e.g. nitroglycerine). The catalyst system comprises 2 to 5% by weight of an aromatic organic lead salt, 1 to 4% by weight of an organic copper salt or an aliphatic organic lead salt, and 0.1 to 2% by weight of acetylene black or benzene black, the percentages quoted for the catalyst system being based on the weights of the base powder. This enables a block to be obtained with high nitramine content (35 to 60% by weight), the resulting block having enhanced rate of combustion while still retaining uniformity of combustion.
Description
Production of double-base
propergol propellant blocks
The present invention is concerned with the production of double-base propergol propellant blocks with a high nitramine content. (The term double-base propergol propellant is used herein in its usual sense to refer to a propergol propellant containing both nitrocellulose and a nitrated oil, such as nitroglycerine.3
It is known to add nitramines to double-base propergol propellants, examples of such nitramines being octogen (HMX, or cyclotetramethylene-tetranitramine) and hexogen (RDX, or cyclotrimethyler.e- trinitramine). However, it is known to be disadvantageous to have a too high nitramine content; for example, the publication KUBOTA Proceedings
International Symposium Space Techno. Sci. 11th, 1975 pages 157-176 shows that for a composition containing 6.8 by weight of octogen, the rate of combustion (Vc) is impaired and the "plateau" in the graph of 5Sc against pressure (P) for a given
c temperature disappears.
French Specification 2165093 discloses the production of a double-base propergol propellant containing a nitramine by gelatinising a nitramine- and nitrocellulose- containing base powder in a mould by means of a composition comprising a nitric ester, a plasticiser and a solvent. However, the amount of nitramine in the resulting composition is restricted to a maximum of 26% by weight, in order to avoid disappearance of the above-mentioned plateau.
We have now developled an improved method of producing a double-base propergol propellant having a high nitramine content, whereby the resultant propellant has increased rate of combustion while retaining substantial uniformity of combustion.
According to the invention, there is provided a method of preparing a double- base propergol propellant using a base powder comprising nitrocellulose having a nitrogen content of 11.5 to 13% by weight, at least one nitramine and a combustion catalyst system. The base powder is gelatinised in a mould at an elevated temperature using a composition comprising a nitric ester, optionally at least one plasticiser, and a stabiliser, in such amounts that the nitric ester and the nitramine are present in the resulting block in amounts of 5 to 30% by weight and 35 to 60% by weight, respectively (that is, with a greater proportion of nitramine than is present in prior art compositions). The catalyst system used in the method according to the invention comprises 0 to 5% by weight of an aromatic organic lead salt, 1 to 4% by weight of an organic copper salt or an aliphatic organic lead salt, and 0.1 to 2% by weight of acetylene black or benzene black, the percentages quoted for the catalyst system being based on the weight of the base powder.
The base powder may also contain at least one plasticiser; the plasticiser content of the result block orate powder is preferably not more than 50% by weight; for higher nitramine contents, the plasticiser is preferably present in an amount of less than 35% by weight. (The plasticiser content of the block is the percentage by weight of nitrated oil plus optional plasticiser based on nitrated oil, optional plasticiser and nitrocellulose.)
A plasticiser is preferably present in the composition used to gelatinise the base powder; the plasticiser may be, for example1 triacetin or dioctyl phthalate.
The aromatic organic lead salt when used in the method according to the invention preferably has a single aromatic nucleus in the organic moiety. The aromatic nucleus may be substituted by one or more hydroxy groups. Examples of suitable such lead salts include lead salicylate (2-hydroxybenzoate), lead - resorcylate (2,4-dihydroxybenzoate) and lead-2, 4,6-trihydroxybenzoate.
The organic copper salt when used in the method according to the invention may be, for example, copper 2-ethyl hexanoate, copper octanoate, dibasic copper stearate, or an aromatic organic copper salt in which the aromatic moiety is as described above with reference to aromatic organic lead salts (for example, copper salicylate).
The aliphatic organic lead salt when used in the method according to the invention may be, for example, lead 2-ethyl hexanoate, lead octanoate or dibasic lead stearate.
As mentioned above, the nitrocellulose used in the method according to the invention has a nitrogen content of 11.5 to 13% by weight. It is preferred that the nitrocellulose is a single nitrocellulose with a nitrogen content of 12.6 + 0.1% by weight, or a mixture of nitrocelluloses having nitrogen contents in the range 11.6 to 12.8% by weight. (The use of the latter mixture does slightly reduce the energy potential (which for nitrocellulose increases with nitrogen content) , but otherwise improves the performance of the propellant composition).
The nitramine used in the method according to the invention is preferably hexogen and/or octogen.
The nitric ester used to gelatinise the base powder in the method according to the invention may be, for example, triethylene glycol dinitrate, trimethylolethane dinitrate, trimethylol-methane dinitrate or nitroglycerine; nitroglycerine is preferred. When nitroglycerine is used, it may also be included in the base powder; the amount thereof is preferably not more than 30% by weight (so as to ensure that the material is sufficiently firm, particularly when heated).
The stabiliser present in the nitric ester may be, for example, 2-nitro-diphenylamine (2-NDPA) or
Centralite (a dialkyldiphenyl urea).
In a preferred embodiment, the nitric ester-contain ing composition used to gelatinise the base powder in the method according to the invention is as follows:
nitroglycerine 72 to 83 by weight
triacetin 27.5 to 1 by weight
2-NDPA or Centralite 0.5 to 1% by weight
The nitric ester-containing composition is preferably used in an amount of 25 to 35% by weight (more preferably 27 to 33% by weight) based on the weight of base powder.
A preferred base powder according to the invention has the following composition (all percentages being by weight).
Nitrocellulose with a nitrogen 25-47% content of between 11.6 and 12.8% by weight
Nitroglycerine 10-25%
Hexogen or Octogen 27-51%
Dioctyl Phthalate (DOP) plasticiser 0-2% 2-Nitrodiphenyl amine (2-NDPA) stabiliser 1-2%
Lead- sresorcylate 2-5%
Copper 2-ethyl hexanoate or monobasic 1-4w copper salicylate or dibasic lead stearate
Acetylene black 0.1-2 The block made by the method according to the invention preferably has the following composition (again, all'percentages are by weight):
Nitrocellulose with nitrogen content 17-34% between 11.6 and 12.8% by weight
Nitroglycerine 27-44%
Nitramine 27-37
Triacetin 4.3-9% Dioctyl phthalate (DOP) plasticiser 0-1.5%
Lead B -resorcylate 1.3-3.7%
Copper 2-ethyl hexanoate or monobasic 0.7-2.9% copper salicylate or dibasic lead stearat Acetylene black 0.7-2.5%
Stabiliser 0.9-1.7%
The propellant block produced by the method according to the invention may have a rate of combustion of at least 15 mm per second and a calorimetric potential greater than 1000 calories per gram. The block may be used over the range of pressure of 100 to 300 bars, depending on the details of the catalyst system used.
The method of gelatinising the base powder in the method according to the invention, in which the nitric ester-containing composition is introduced into a mould containing the base powder and heating the mould is preferably as described in the abovementioned French Specification 2165093 (and its
British equivalent, No. 1371458).
In order that the present invention may be more fully understood, the following Examples (in which all parts and percentages are by weight) are given by way of illustration only. In all the Examples, a base powder was gelatinised with the following composition (Composition A).
Nitroglycerine 78%
Triacetin 21% 2-NDPA 1% Examples 1 to 5
The base powders used had the following composi
tions
Example No. 1 2 @ 3 4 5
Nitrocellulose N=12.6% 22.5 31.5 22.5 31.5 17.7
Nitrocellulose N=11.7% 10.0 - 10 - 8.8
Nitroglycerine 15 15 15 10 10
Hexogen 45 45 45 49
Octogen - - - - 45
Lead -resorcylate 3 3 4 3 3
Copper 2-ethyl hexanoate 2 2 - - 2
Monobasic copper salicylate - - 2 -
Dibasic lead stearate - - - 3
Acetylene black 1.0 1.5 1.5 1.5 1.5
2-NDPA 1.5 2 2 2 2
The resulting propellant blocks () = 90 mm,
L = 90 mm) were then tested for frontal combustion in
missiles at various temperatures. The results of
plotting Vc against P for the blocks of Examples 1 to
5 are given in Figures 1 to 5, respectively.
Examples 6 and 7
The base powder used had the following compositions:
Example 6 Example 7
Nitrocellulose 42.5 32.5
Nitroglycerine 10 20 flexogen 39 49
Lead ss -resorcylate 3 3
Monobasic copper salicylate 2 2
Acetylene black 1.5 1.5 2-NDPA 2 2
The resulting blocks, when tested as in Example 1,gave results as shown in Figure 6 (curve A corresponds to Example 6 and curve B to Example 7).
Example 8 (Comparative)
A propellant was produced by the universal method (slurry casting) by mixing Composition A in a proportion of 46.5% of the final composition with 31.5% of Hexogen, ballistic catalysts and 22% nitrocellulose in the form of microspheres.
The mixture was then heated for gelatinisation and tested in a missile at 200C.
The results, as shown in Figure 7, indicate that the obtained propellant underwent inferior combustion; there is no plateau in the curve.
Claims (12)
1. A method of preparing a double-base propergol propellant block which comprises providing a base powder comprising nitrocellulose having a nitrogen content of 11.5 to 13% by weight, at least one nitramine and a combustion catalyst system, gelatinising the base powder in a mould at elevated temperature by means of a composition comprising a nitric ester and a stabiliser, in such amounts that the nitric ester and the nitramine are present in the resulting block in amounts of 5 to 30% by weight and 35 to 6% by weight, respectively, the catalyst system comprising 0 to 5% by weight of an aromatic organic lead salt, 1 to 4% by weight of an organic copper salt or an aliphatic organic lead salt, and 0.1 to 2% by weight of acetylene black or benzene black, the percentages quoted for the catalyst system being based on the weight of the base powder.
2. A method according -to claim 1, in which the aromatic organic lead salt has a single aromatic nucleus in the organic moiety.
3. A method according to claim 2, in which said aromatic nucleus is substituted by one or more hydroxy groups.
4. A method according to claim 3, in which the aromatic organic lead salt is lead -resorcylate.
5. A method according to any of claims 1 to 4, in which the organic copper salt is copper 2-ethylhexanoate, copper octanoate, copper stearate or monobasic copper salicylate,
6. A method according to any of claims 1 to 4, in which the aliphatic organic lead salt is dibasic lead stearate.
7. A method according to any of claims 1 to 6, in which the catalyst system is present in an amount of at least 5%, based on the weight of the base powder.
8. A process according to any of claims 1 to 7, in which the moulding powder has the following composition, by weight:
nitrocellulose with nitrogen 25-47
content of 11.6 to 12.8%
nitroglycerine 10-25
hexogen or octogen 37-51 dioctyl phthalate (DOP) plasticiser 0-2%
2-nitrodiphenyl-amine (2-NDPA) stabiliser 1-2% lead -resorcylate 2-5%
copper 2-ethyl hexanoate or monobasic 1-4%
copper salicylate or dibasic lead stearate
acetylene black 0.1-2%
9. A process according to any of claims 1 to 8, in which the resulting block has the following composition, by weight:
nitrocellulose with a nitrogen 17-34%
content of 11.6 to 12.8%
nitroglycerine 27-44%
nitramine 25-37%
triacetin 4.3-9%
dioctyl phthalate (DOP) plasticiser 0-1.5%
lead-ss-resorcylate 1.3-3.7%
copper 2-ethyl hexanoate or monobasic 0.7-2.9%
copper salicylate or dibasic lead
stearate
acetylene black 0.7-1.5%
stabiliser 0.9-1.7%
10. A process of making a double base propergol block, substantially as herein described in any of
Examples 1 to 7.
8. A method according to any of claims 1 to 7, in which the base powder has the following composition:
Nitrocellulose with a nitrogen 25-47%
content of between
11.6 and
12.8% by weight
Nitroglycerine 10-25%
Hexogen or Octogen 37-51%
Dioctyl Phthalate (DOP) plasticiser 0-2%
2-Nitrodiphenyl amine (2-NDPA) stabiliser 1-2% Lead- P fez resorcylate 2-5%
Copper 2-ethyl hexanoate or monobasic 1-4% copper salicylate or dibasic lead stearate
Acetylene black 0.1-2%
all the above percentages of ingredients being based on the weight of the base powder.
9. A method according to any of claims 1 to 8, in which the base powder contains a plasticiser other than the nitric ester.
10. A method according to any of claims 1 to 9, in which the resulting block has the following composition:
Nitrocellulose with a nitrogen 17-34%
content between 11.6 and 12.8% by weight
Nitroglycerine 27-44%
Nitramine 25-37%
Triacetin 4.3~9% Dioctyl phthalate (DOF) plasticiser 0-1.5%
Lead B-resorcylate 1.3-3.7%
Copper 2-ethyl hexanoate or monobasic 0.7-2.9%
copper salicylate or dibasic lead
stearate
Acetylene black 0.7-1.5%
Stabiliser 0.9-1.7% 11. A method of preparing a double-base propergol block, substantially as herein described in any of the Examples.
Amendments to the Claims have been filed as follows
Claims:
1. A process of making a homogeneous moulded double
base propergol block having a high nitramine content,
which comprises adding a moulding solvent consisting
of nitric ester, a plasticiser and a stabilisersto a
moulding powder contained in a mould, the moulding powder
comprising a nitrocellulose having a nitrogen content
of from 11.5 to 13: at least one stabiliser, at least
one nitramine, combustion catalysts and, optionally,
a nitric ester and a plasticiser, and curing the mixture
to effect gelatinisation of the nitrocellulose, in
which the moulding powder contains, by weight, from
O to 30% of nitric ester and from 35 to 60% of nitramine,
and has a degree of plasticisation of from 0 to 50%, and
the combustion catalysts consist of a catalyst system
comprising, by weight, with respect to the moulding powder:
2 to 5% of an aromatic organic lead salt,
1 to 4% of an aliphatic or aromatic organic
copper salt or an aliphatic organic
lead salt, and
0.1 to 2% of acetylene black or benzene black.
2. A process according to claim 1, in which the
aromatic organic lead salt has a single aromatic
nucleus in the organic moiety.
3. A process according to claim 2, in which said
aromatic nucleus is substituted by onr or more hydroxy
groups.
4. A process according to claim 3, in which the
aromatic organic lead salt is lead- A-resorcylate.
5. A process according to any of claims 1 to 4, in which the organic copper salt is copper 2-ethylhexanoate, copper octanoate, copper stearate or monobasic copper salicylate.
6. A process according to any of claims 1 to 4, in which the aliphatic organic lead salt is dibasic lead stearate.
7. A process according to any of claims 1 to 6, in which the catalyst system is present in an amount of at least 5%, based on the weight of the moulding powder.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8108245A FR2751323B1 (en) | 1981-04-24 | 1981-04-24 | MOLDING PROCESS FOR MAKING A DOUBLE BASED PROPERGOL BLOCK WITH A HIGH NITRAMINE RATE AND PROPERGOL BLOCK OBTAINED BY THIS PROCESS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8210890D0 GB8210890D0 (en) | 1998-01-07 |
| GB2315744A true GB2315744A (en) | 1998-02-11 |
| GB2315744B GB2315744B (en) | 1998-06-24 |
Family
ID=9257765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8210890A Expired - Fee Related GB2315744B (en) | 1981-04-24 | 1982-04-20 | Production of double-base propergol propellant blocks |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE3215477C1 (en) |
| FR (1) | FR2751323B1 (en) |
| GB (1) | GB2315744B (en) |
| IT (1) | IT8267521A0 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1277192A (en) * | 1965-12-30 | 1972-06-07 | Us Gov Sec Army | Improvements in and relating to nitrocellulose base propellant compositions |
| GB1279961A (en) * | 1964-02-28 | 1972-06-28 | Us Army | Improvements in or relating to nitrocellulose base compositions |
| GB1371458A (en) * | 1971-12-17 | 1974-10-23 | Poudres & Explosifs Ste Nale | Propellant powder compositions |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3032972A (en) * | 1956-12-21 | 1962-05-08 | Hercules Powder Co Ltd | Propellants |
| US3422170A (en) * | 1959-12-17 | 1969-01-14 | Hercules Inc | Slurry casting manufacture of nitrocellulose propellant grains |
| DE1446893A1 (en) * | 1962-01-05 | 1969-05-29 | Thyssen Bornemisza Baronin Ily | Powder for launching wing stabilized grenades |
| US3951706A (en) * | 1962-07-03 | 1976-04-20 | Eldridge Judson B | Solid propellant mixtures and process of preparation |
| US3943209A (en) * | 1964-09-21 | 1976-03-09 | The United States Of America As Represented By The Secretary Of The Army | High volumetric energy smokeless solid rocket propellant |
| US3951704A (en) * | 1970-07-01 | 1976-04-20 | The United States Of America As Represented By The Secretary Of The Army | Double-base propellants with combustion modifier |
| US3764416A (en) * | 1971-05-13 | 1973-10-09 | Us Army | Low energy propellant producing essentially non reactive gaseous exhaust products |
| US4092188A (en) * | 1977-05-16 | 1978-05-30 | Lovelace Alan M Acting Adminis | Nitramine propellants |
| FR2459213A1 (en) * | 1979-06-14 | 1981-01-09 | Hercules Inc | Removing processing solvent from propellant casting powders - by adding miscible organic liq. which is not a solvent for the powder |
| DE3033519A1 (en) * | 1980-09-05 | 1982-04-29 | Hercules Inc., 19899 Wilmington, Del. | SMOKE-FREE, CROSS-LINKED, TWO-COMPONENT BLOWING AGENT AND METHOD FOR THE PRODUCTION THEREOF |
-
1981
- 1981-04-24 FR FR8108245A patent/FR2751323B1/en not_active Expired - Lifetime
-
1982
- 1982-04-20 IT IT8267521A patent/IT8267521A0/en unknown
- 1982-04-20 GB GB8210890A patent/GB2315744B/en not_active Expired - Fee Related
- 1982-04-26 DE DE3215477A patent/DE3215477C1/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1279961A (en) * | 1964-02-28 | 1972-06-28 | Us Army | Improvements in or relating to nitrocellulose base compositions |
| GB1277192A (en) * | 1965-12-30 | 1972-06-07 | Us Gov Sec Army | Improvements in and relating to nitrocellulose base propellant compositions |
| GB1371458A (en) * | 1971-12-17 | 1974-10-23 | Poudres & Explosifs Ste Nale | Propellant powder compositions |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2315744B (en) | 1998-06-24 |
| DE3215477C1 (en) | 1998-06-10 |
| FR2751323A1 (en) | 1998-01-23 |
| IT8267521A0 (en) | 1982-04-20 |
| FR2751323B1 (en) | 1998-09-18 |
| GB8210890D0 (en) | 1998-01-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4102953A (en) | Method for making extruded, solventless, composite-modified double base propellant | |
| US3689331A (en) | Nitrocellulose base compositions and method for making same | |
| US7842144B1 (en) | Methods of making double base casting powder | |
| US3839106A (en) | Composite explosive with a carboxylic polydiolefin binder | |
| US5716557A (en) | Method of making high energy explosives and propellants | |
| US3711344A (en) | Processing of crosslinked nitrocellulose propellants | |
| US4216039A (en) | Smokeless propellant compositions having polyester or polybutadiene binder system crosslinked with nitrocellulose | |
| US3702272A (en) | Spherical rocket propellant casting granules and method of preparation | |
| US4029529A (en) | Crosslinked carboxyl containing polymer and nitrocellulose as solid propellant binder | |
| US4000025A (en) | Incorporating ballistic modifiers in slurry cast double base containing compositions | |
| US3379588A (en) | Manufacture of plastic high-power blasting explosive compositions and charges | |
| US3726729A (en) | Solid propellant compositions having a nitrocellulose-hydroxyl-terminated polybutadiene binder and method of preparing the same | |
| CA1168052A (en) | Poly-base propellant | |
| US3400025A (en) | Flexible explosive comprising rdx, hmx or petn and mixed plasticizer | |
| US5205983A (en) | Energetic plasticizer and improved gas producing charges | |
| US3943017A (en) | Explosive composition comprising HMX, RDX, or PETN and a high viscosity nitrocellulose binder plasticized with TMETN | |
| US3473982A (en) | Nitrocellulose explosive containing a charcoal binder-oxidizer mixture | |
| CA2301392C (en) | Desensitisation of energetic materials | |
| GB2315744A (en) | Production of double-base propergol propellant blocks | |
| US5385619A (en) | Nitrocellulose propellant composition | |
| JPH0759694B2 (en) | Propellant composition containing binder / filling adhesive | |
| US4392895A (en) | Ramjet fuel | |
| US3971681A (en) | Composite double base propellant with triaminoguanidinium azide | |
| US3785888A (en) | Nitrocellulose gas-generating composition containing a polyethylene glycol | |
| US3791893A (en) | Fast burning double-base propellant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20010420 |