GB2507459A - High-energy formulation having an elastomeric binder formed from mixed hydroxyl-terminated polybutadiene - Google Patents
High-energy formulation having an elastomeric binder formed from mixed hydroxyl-terminated polybutadiene Download PDFInfo
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- GB2507459A GB2507459A GB8816781.2A GB8816781A GB2507459A GB 2507459 A GB2507459 A GB 2507459A GB 8816781 A GB8816781 A GB 8816781A GB 2507459 A GB2507459 A GB 2507459A
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- United Kingdom
- Prior art keywords
- percent
- polybutadiene
- mixture
- hydroxyl
- molecular weight
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- 239000000203 mixture Substances 0.000 title claims abstract description 93
- 229920002121 Hydroxyl-terminated polybutadiene Polymers 0.000 title claims description 35
- 238000009472 formulation Methods 0.000 title claims description 15
- 239000011230 binding agent Substances 0.000 title description 17
- 229920002857 polybutadiene Polymers 0.000 claims abstract description 31
- 239000005062 Polybutadiene Substances 0.000 claims abstract description 29
- 229920001971 elastomer Polymers 0.000 claims abstract description 15
- 239000000806 elastomer Substances 0.000 claims abstract description 15
- 239000012948 isocyanate Substances 0.000 claims abstract description 15
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 15
- 229920000642 polymer Polymers 0.000 claims description 21
- 239000007787 solid Substances 0.000 claims description 12
- 239000011159 matrix material Substances 0.000 claims description 11
- 239000000446 fuel Substances 0.000 claims description 8
- 239000007800 oxidant agent Substances 0.000 claims description 8
- 239000004014 plasticizer Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims 14
- 230000007775 late Effects 0.000 claims 1
- 239000003380 propellant Substances 0.000 abstract description 19
- 239000004449 solid propellant Substances 0.000 abstract description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 9
- 239000004215 Carbon black (E152) Substances 0.000 description 8
- 229930195733 hydrocarbon Natural products 0.000 description 8
- 150000002430 hydrocarbons Chemical class 0.000 description 8
- 238000007792 addition Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 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 description 4
- 239000005058 Isophorone diisocyanate Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 238000011925 1,2-addition Methods 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- UZGLIIJVICEWHF-UHFFFAOYSA-N octogen Chemical group [O-][N+](=O)N1CN([N+]([O-])=O)CN([N+]([O-])=O)CN([N+]([O-])=O)C1 UZGLIIJVICEWHF-UHFFFAOYSA-N 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- ZWVMLYRJXORSEP-UHFFFAOYSA-N 1,2,6-Hexanetriol Chemical compound OCCCCC(O)CO ZWVMLYRJXORSEP-UHFFFAOYSA-N 0.000 description 1
- QWDQYHPOSSHSAW-UHFFFAOYSA-N 1-isocyanatooctadecane Chemical compound CCCCCCCCCCCCCCCCCCN=C=O QWDQYHPOSSHSAW-UHFFFAOYSA-N 0.000 description 1
- GDDNTTHUKVNJRA-UHFFFAOYSA-N 3-bromo-3,3-difluoroprop-1-ene Chemical compound FC(F)(Br)C=C GDDNTTHUKVNJRA-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- CTKINSOISVBQLD-UHFFFAOYSA-N Glycidol Chemical compound OCC1CO1 CTKINSOISVBQLD-UHFFFAOYSA-N 0.000 description 1
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- ZFMQKOWCDKKBIF-UHFFFAOYSA-N bis(3,5-difluorophenyl)phosphane Chemical compound FC1=CC(F)=CC(PC=2C=C(F)C=C(F)C=2)=C1 ZFMQKOWCDKKBIF-UHFFFAOYSA-N 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 description 1
- ZHXAZZQXWJJBHA-UHFFFAOYSA-N triphenylbismuthane Chemical group C1=CC=CC=C1[Bi](C=1C=CC=CC=1)C1=CC=CC=C1 ZHXAZZQXWJJBHA-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
- 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
-
- 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
- C06B45/02—Compositions or products which are defined by structure or arrangement of component of product comprising particles of diverse size or shape
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
Abstract
An elastomer for a solid propellant composition or the like is formed from a mixture of a low molecular weight, difunctional or greater polybutadiene, a high molecular weight difunctional or greater polybutadiene and a monofunctional polybutadiene, the mixture of polybutadiene being cured with a polyfunctional isocyanate curative. The addition of the high molecular weight polybutadiene and the low molecular weight polybutadiene contribute to low-temperature mechanical properties of the propellant composition.
Description
HIGH-ENERGY FORMULATION HAVING /N ELASTOMERIC BINDER
FORMED FROM MIXED HYDROXYL-TERNINATED POLYBUTADIENE
The present invention is directed to solid high-energy compositions, such as propellants for rocket motors or the like and more particularly to a solid high-energy composition formed from a hydrocarbon-based elastomeric binder and having improved low-temperature mechanical properties.
High-energy compositions, such as solid propellants, comprise high-energy particulates, including fuel particulates and oxidizer particulates, dispersed in an elastomeric matrix. The elastomeric matrix includes an elastomeric binder and generally includes a plasticizer for the elastomeric binder.
One type of polymeric material commonly used to produce elastomeric binders are hydrocarbon polymers, such as polybutadiene. In order that the hydrocarbon polymeric material may be cured to produce the elastomer, hydrocarbon polymers are typically modified to have terminal functional groups. Thus, it is known to prepare elastomers from hydroxyl-terminated polybutadiene by curing the same with a multifunctional isocyanate. Typically, in preparing propellant formulations, a hydroxyl-terminated polybutadiene having a molecular weight in the 2000 to 4000 range is used. For example, hydroxyl-terminated butadiene sold under the trade designation R-45M by Sartomer and having a molecular weight (number average) of about 3000 has been used in preparing propellant formulations.
Propellants having hydrocarbon binders, such as those prepared from hydroxyl-terminated polybutadiene, are characterized by relatively low burning rate slopes,
I I l-
relatively low temperature sensitivities and relatively low hazards sensitivities. Hydrocarbon binders can generally be loaded with a high solid (fuel and oxidizer particulates) content. Generally, hydrocarbon binders are used where low hazards is a requirement.
In providing elastomeric binders for propellants, mechanical properties, such as stress and strain, are important considerations. Rockets, such as those carried on wings of aircraft, are exposed to very low temperatures, and it is necessary that adequate mechanical characteristics be exhibited by the propellant binders at such very low temperatures.
Typically, mechanical properties of propellant compositions are tested down to -65°F (-54°C) to ensure adequate low-temperature performance.
There is a continued need to provide propellant binders which give propellant compositions or the like improved low temperature performance.
In accordance with the invention, propellant binders are produced from mixtures of hydroxyl-terminated polybutadienes to provide propellant compositions with improved low-temperature mechanical properties, e.g., at -65°F. In accordance with the present invention, relatively low-molecular weight hydroxyl-terminated polybutadienes are mixed with a minor portion of relatively high-molecular weight polybutadienes which give the elastomeric binder improved mechanical characteristics. In accordance with another aspect of the invention, multifunctional hydroxyl-terminated polybutadiene is mixed with a minor portion of ruonofunctional hydroxyl-terminated (at one terminus) polybutadiene. The monofunctional butadiene \ I cannot fully integrate into the cross-linked system of the elastomer; the terminus which contains no hydroxyl group remaining free. The free end of the monofunctional butadiene internally plasticizes the elastomer; that is, it promotes better relative movement of the polymeric chains of the elastomer relative to each other, thereby improving the mechanical characteristics of the elastomer, particularly at low temperatures.
The following abbreviations are used herein to refer to various material: HTPB = hydroxyl-terminated polybutadiene (multifunctional), mHTPB = hydroxyl-terminated polybutadiene (monofunctional), AP = ammonium perchlorate, DOA = dioctyl adipate, Tepanol = a common name for an Al' bonding agent, reaction product of tetraethylenepentamine, acrylonitrile and glycidol; the material is made and sold by 3M as HX-878, ODI = Octadecylisocyanate, IPDI = isophorone diisocyanate, TPB = Triphenyl bismuth (a cure catalyst), HIIX = cyclotetramethylene tetranitramine, and RDX = cyclotrimethylene trinitramine. R-45 is a HTPB having a number average molecular weight of about 3000 and is produced by Sartomer. Phillips 80-039-84 is a HTPB having a number average molecular weight of about 10,000.
Lithene GFN-4-S000 is a mHTPB having a number average molecular weight of about 3000. The following symbols are used to designate mechanical characteristics: Shore A is a measure of hardness, E2116 is modulus, 0m is maximum stress, 0c is corrected maximum stress, Et is true strain at maximum stress, E 4C is true corrected strain at maximum stress, and Et is true strain at failure.
Hydrocarbon-based elastomers must contain substantial levels of solids in order to provide the necessary energy for many propellant or other high-energy purposes. High-energy compositions in accordance with the invention typically contain between
--
about 60 and about 90 wt. percent high-energy solids, including fuel and oxidizer particulates such as finely divided aluminum (Al), AP, BIIX, and RDX. The elastomeric matrix, which is substantially less energetic than the particulates, is thereby minimized.
If the elastomer is to be derived from HTPB, it is necessary that the viscosity of the polymer be sufficiently low that the uncured propellant formulation may be mixed and cast. Generally, the lower the molecular weight of the polymer, the lower the viscosity, and therefore the major proportion of HTPB used herein is of low molecular weight, having a number average molecular weight in the range of from about 2000 to about 4000. If the major proportion of the HTPB is of higher molecular weight, mixing and casting problems are exhibited due to higher viscosities. The low molecular weight HTPB further provides that cross-links are sufficiently close together for good mechanical integrity of the cured elastomer. The low molecular weight is used at between about 50 and about 90 wt. percent of the total amount of H'IPB and mHTPB.
In accordance with one aspect of the invention, elastomeric properties of a binder are improved through the use of a minor proportion of a HTPB having a high molecular weight, i.e., in the range of about 6000 to 12,000 (number average (Mn)) The additional distance between cross-links is believed to enhance the stretching properties of the elastomers. The high molecular weight HTPB is used at levels of up to about wt % of the polymer (HTPB plus mHTPB).
It is preferred that the high molecular weight HTPB be used at levels of at least about 5 percent of the total amount of polymer and more preferably at levels of at least about 15 percent of the total amount of polymer.
In accordance with another aspect of the invention, inclusion of a minor amount of mHTPB with a major amount of HTPB produces an internally-plasticized elastomer with improved low-temperature mechanical properties. The Mn of the ITtHTPB is in the range of the major HTPB, i.e., in the range of about 2000 to about 4000. Higher molecular weight IIIHTPB would be expected to increase the viscosity of the uncured propellant formulation and would not be expected to enhance internal plasticizing. mHTPB may be used up to about wt. % of total polymer. Preferably mHTPB is used at at least about a 5 wt. % level and more preferably at at least a 15 cit. % level of total polymer.
Preferred HTPB's and mHTPB's for forming elastomers according to the invention consist predominantly of 1,4 butadiene chain addition mer units, 1,4 mer units preferably comprising about 60% of the mer units and more preferably about 80% of the mer units. Generally, trans additions predominate, trans additions typically representing at least about 65% of total 1,4 additions, and trans 1,4 additions typically representing at least about 50% of total butadiene mer unit additions. The percentage of trans relative to cis addition is not considered particularly critical to the properties of the polymers or the elastomeric binders formed therefrom; however, it is preferred that the polybutadiene not be predominantly formed by 1,2 additions; and polybutadiene having greater than about 60% 1,2 additions are considered generally less suitable for purposes of the present invention.
Urethane-type curing is effected with isocyanates through the terminal hydroxyl groups of the HTPB's and mHTPB's. Because the polymers have functionalities of about 1 and 2 or greater, the isocyanate curatives used to cure the polymers preferably have a functionality of 2 or greater in order to provide a significant dcgree.of urethane-type cross-linkage in addition to chain extension.
A suitable isocyanate composition with a functionality of 2 which is useful as a curative is IPDI. A suitable mixed isocyanate resin with a functionality of greater than 2 is sold under the tradename Desmodur N-l0O and has a functionality of about 3.6. A difunctional isocyanate curative may also be used with an additional cross-linking agent such as a trifunctional, low molecular weight alcohol, e.g., trirnethylol propane or 1,2,6-hexane triol.
The isocyanate curative is supplied as at least 0.5 equivalent of isocyanate per hydroxyl (NCO/OH), and preferably as at least 1.0 equivalents. The isocyanate curative generally comprises between about 2.0 and about 11.0 percent of the cured binder components, i.e., polymer plus curative.
The propellant formulation typically also contains minor amounts, e.g., up to about 5 wt. percent, of additional ingredients, such as flow control agents, viscosity reducing agents, stabilizers, etc. Curing is effected at elevated temperatures to promote relatively rapid curing. Typically, block polymers are cured with isocyanate curatives at temperatures of 120-130°F (49-54°C) for a period of about 6 days.
In high-energy formulations, the polymers are mixed with solids, including fuel material particulates, e.g., aluminum, and oxidizer particulates, e.g., AP, HIIX and RDX. Generally, the formulation includes an external plasticizer at plasticizer-to-polymer ratios (PlJPo) of between about 0.07:1 and about 0.7:1. Then, the isacyanate curative is added and the grain is cast, e.g., into a rocket H 1 motor casing, and curing is effected at appropriate temperatures and for appropriate time periods.
The invention will now be described in greater detail by way of a specific example.
EXANPLE
A propellant composition (#02) was formulated as follows: blatl Wt.
R-45m 5.862 37.80g Phillips BD-034-84 1.476 9.52g Lithene HFN-4-5000 1.851 11.94g DOA 2.00 12.90g Tepanol 0.15 0.97g Premix Totals [11.339 t73.13g] Premix 11.339 72..42g Aluminum 19.00 121.33g AP(lOOu) 44.00 280.98g AP(SOu) 15.00 95.77g ODI 0.04 0.26g HMX 10.00 63.86g Prebatch Totals [99.379] [634.62g] Prebatch 99.379 616.lGg IPDI 0.611 3.79g TPB 0.01 0.06g Propellant Totals 100.00 620.Olg Composition (#01) was formulated in an identical manner except with no ODI.
The compositions were prepared and cast according to the following protocol: Mix Temperature 165°F for Steps 1 through 11. (74°c) 1. Add R-45M, Phillips BD-034-84, Lithene HFN-4-5000, Tepanol, and DOA to bowl and mix 5 minutes.
2. Add aluminum to bowl and mix for 5 minutes.
3. Scrape down. Add 200u A? and mix f or 5 minutes without vacuum.
4. Mix under vacuum ( 0.5 in. Hg) for 40 minutes.
5. Scrape down. Add remaining 200u A? and mix for 5 minutes without vacuum.
6. Mix for 30 minutes under vacuum ( 0.5 in. Hg).
7. Scrape down. Add SQu AP and mix 5 minutes at without vacuum.
B. Mix for 30 minutes under vacuum.
9. Scrape down. Add ODI and mix 10 minutes under vacuum ( 0.5 in. Hg).
10. Scrape down. Add remaining 50u A? and mix 5 minutes without vacuum.
11. Mix for 30 minutes with vacuum C 0.5 in. Hg).
Mix Temperature 135°F for Remainder of Mix. (57°c) 12. Scrape down. Add}X and mix 5 minutes without vacuum.
13. Mix 30 minutes under vacuum ( 0.5 in. Hg).
14. Age prebatch 12.0 hrs minimum.
Prebatch Time 71.0 hrs Prebatch Temp 120°F (49°c) 15. Add curing agent and TPB. Mix 5 minutes without vacuum.
16. scrape down. Mix 20 minutes with vacuum 0.5 in. Hg).
17. Scrape down and cast.
The propellant compositions exhibited the following mechanical characteristics: Mechanical Properties Mix 4$ Test Temp(°F) E26 o 01 77 (25°c) 1193 169 229 36 -65 (-54°c)1o.96o 619 844 35 H q (cont.) Mechanical Properties Mix % Test Temp(°F) E26 2m o 02 77 (25°c) 596 126 1g4 -65 E-54°c) 6,180 506 662 30 Mechanical Properties Mix % Test Temp(°F) EPC 4 Shore A 01 77 (25°c) 36 37 69 -65 e54°c) 35 39 02 77 (25°c) 45 48 54 -65 (-54°c) 37 39 While the invention has been described in terms of certain preferred embodiments, modifications obvious to one with ordinary skill in the art may be made without departing from the scope of the invention.
Various features of the invention are set forth in the following claims.
Claims (1)
- CLAIMS1. A high-energy composition comprising between about and about 90 wt. percent of high-energy solid particulates including fuel and/or oxidizer particulates, balance substantially consisting of an elastomeric matrix, said elastomeric matrix comprising an elastomer formed from a mixture of hydroxyl-terminated polybutadienes cured with an isocyanate curative of functionality 2 or greater, said mixture of hydroxyl-terminated polybutadiene consisting essentially of between about 50 and about 90 wt.percent of a hydroxyl-terminated polybutadiene having a functionality of 2 or greater and having a number average molecular weight of between about 2000 and about 4000, up to about 25 wt. percent of a hydroxyl-terminated polybutadiene having a functionality of 2 or greater and having a number average molecular weight of between about 6000 and about 12,000 and up to about 25 wt. percent of a monofunctional hydroxyl-terminated. polybutadiene having a number average molecular weight of between about 2000 and about 4000.2. A composition according to Claim 1 wherein said 6000-12,000 Mn polybutadiene comprises at least about 5 wt. percent of said mixture.3. A composition according to Claim 1 wherein said 6000-12,000 Mn polybutadiene comprises at least about wt. percent of said mixture.4. A composition according to Claim 1 wherein said monofunctional polybutadiene comprises at least about 5 wt. percent of said mixture.5. A composition according to Claim 1 wherein said monofunctional polybutadiene comprises at least about wt. percent of said mixture.6. A composition according to claim 1 wherein said polymeric matrix further comprises a plasticizer at a plasticizer-to-polymer ratio of between about 0.07:1 to about 0.7:1.7. A method of preparing a high-energy composition comprising preparing a formulation of high-energy solid particulates including fuel particulates and/or oxidizer particulates in amounts sufficient to provide between about 60 and about 90 wt. percent of the total of a high-energy composition and a mixture of hydroxyl-terminated polybutadienes, between about 50 and about wt. percent of which have a functionality of 2 or greater and have a number average molecular weight of between about 2000 and about 4000, up to about 25 wt.percent of which have a functionality of 2 or greater and have a number average molecular weight of between about 6000 and about 12,000 and up to about 25 wt. percent of which are monofunctional and have a number average molecular weight of between about 2000 and about 4000, further adding to said formulation an isocyanate curative having a functionality of 2 or greater, and allowing said formulation to cure to provide a composition comprising an elastomeric matrix in which said solid particu.lates are dispersed.B. A method according to Claim 7 further adding a plasticizer at a plasticizer-to-polymer ratio of between about 0.07:1 to about 0.7:1.* H 1 ft 9. A method according to Claim 7 wherein said 6000-12,000 Mn polybutadiene comprises at least about 5 wt. percent of said mixture.10. A method according to Claim 7 wherein said 6000-12,000 M polybutadiene comprises at least about wt. percent of said mixture.11. A method according to Claim 7 wherein said monofunctional polybutadiene comprises at least about 5 wt. percent of said mixture.12. A method according to Claim 7 wherein said monofunctional polybutadiene comprises at least about wt. percent of said mixture.13. A method according to claim 1 substantially as herein described and exenpilfied.Amendments to the claims have been filed as followsVCCLAIMSA high-energy composition comprising between 60 and wt. percent of high-energy solid particulates including fuel and/or oxidizer particulates, balance substantially consisting of an elastomeric matrix, said elastomeric matrix comprising an elastomer formed from a mixture of hydroxyl-terminated polybutadienes cured.with an isocyanate curative of functionality 2 or greater, said mixture of hydroxyl -terminated polybutadienes consisting essentially of A. between 50 and 90 wt. percent of a hydroxyl-terminated polybutadiene having a functionality of 2 or greater and having a number average molecular weight of between 2000 and 4000, B. up to 25 wt. percent of a hydroxyl-terrninated polybutadiene having a functionality of 2 or greater and having a number average niolecular weight of between 6000 and 12,000 and p to 25 wt. percent of a monofunctional hydroxyl-terminated polybutadiene having a number average molecular weight of between 2000 and 4000.2. A composition according to Claim 1 wherein said 6000-12,000 M polybutadiene (B) comprises at least 5 wt.percent of said mixture.3. A composition according to Claim 2 wherein said 6000-12,000 Mn polybutadiene (B) comprises at least 15 wt.percent of said mixture.4. A composition according to any preceding Claim wherein said monofunctional polybutadiene (C) comprises at least 5 wt. percent of said mixture.* 5. A composition according to Claim 4 wherein said monofunctional polybutadiene (C) comprises at least 15 wt.percent of said mixture.6. A composition according to any preceding Claim wherein said polymeric matrix further comprises a plasti-Ccizer at a plasticizer-to-polymer ratio of between 0.07:1 to 0.7:1.7. A method of preparing a high-energy composition comprising preparing a formulation of high-energy solid particulates including fuel particulates and/or oxidizer particulates in amounts sufficient to provide between 60 and 90 wt. percent of the total of a high-energy composi-tion and a mixture of hyroxyL-terminated polybutadienes consisting essentially of: A. between 50 and 90 wt. percent of a hydroxyl-terminated polybutadiene having a functionality of 2 or greater and a number average molecular weight of between 2000 and 4000, B. up to 25 wt. percent of a hydroxyl-terminated polybutadiene having a functionality of 2 or greater and a.nurither average molecular weight of between 6000 and 12,000 and C. up to 25 wt. percent of a monofunctional hydroxyl-terminated polybutadiene having a number average molecular weight of between 2000 and 4000, further adding to said formulation an isocyanate curative having a functionality of 2 or greater, and allow-irig said formulation to cure to provide a composition comprising an elastomeric matrix in which said solid par-ticulates are dispersed.8. A method according to Claim 7 which further com-prises the step of adding a plasticizer at a plasticizer-to-polymer ratio of between 0.07:1 to 0.7:1.9. A method according to Claim 7 or Claim S wherein said 6000-12,000 M polybutadiene (B) comprises at least 5 wt. percent Of said mixture.10. A method according to Claim 9 wherein said 6000- 12,000 Mn polybutadiene (B) comprises at least 15 wt. per-cent of said mixture.11. A method according to any one of Claim 7 to 9 C 5 wherein said monofunctional polybutadiene (C) comprises at least 5 wt. percent of said mixture.12. A method according to Claim 11 wherein said mono-functional polybutadiene (C) comprises at least 15 wt.percent of said mixture.13. A composition according to claim 1 substantially as herein described and exemplified.14. A method according to claim 7 substantially as herein described and exemplified.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US7548987A | 1987-07-21 | 1987-07-21 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8816781D0 GB8816781D0 (en) | 2013-10-30 |
| GB2507459A true GB2507459A (en) | 2014-05-07 |
| GB2507459B GB2507459B (en) | 2014-11-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8816781.2A Expired - Lifetime GB2507459B (en) | 1987-07-21 | 1988-07-14 | High-energy formulation having an elastomeric binder formed from mixed hydroxyl-terminated polybutadiene |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2507459B (en) |
| IT (1) | IT8848187A0 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014040343A (en) * | 2012-08-22 | 2014-03-06 | Nof Corp | Production method of explosive charge composition, and explosive charge composition produced by the production method |
| WO2017064102A1 (en) * | 2015-10-12 | 2017-04-20 | Lewtas Science & Technologies Ltd | Improvements in or relating to energetic materials |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111517900A (en) * | 2019-12-12 | 2020-08-11 | 北京理工大学 | Composite propellant with propynyl-terminated polybutadiene as adhesive and preparation method thereof |
-
1988
- 1988-07-13 IT IT8848187A patent/IT8848187A0/en unknown
- 1988-07-14 GB GB8816781.2A patent/GB2507459B/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| None * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014040343A (en) * | 2012-08-22 | 2014-03-06 | Nof Corp | Production method of explosive charge composition, and explosive charge composition produced by the production method |
| WO2017064102A1 (en) * | 2015-10-12 | 2017-04-20 | Lewtas Science & Technologies Ltd | Improvements in or relating to energetic materials |
| US11802099B2 (en) | 2015-10-12 | 2023-10-31 | Lewtas Science & Technologies Ltd | Or relating to energetic materials |
Also Published As
| Publication number | Publication date |
|---|---|
| IT8848187A0 (en) | 1988-07-13 |
| GB8816781D0 (en) | 2013-10-30 |
| GB2507459B (en) | 2014-11-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Expiry date: 20080713 |