DE977458C - Manufacture of bubble-free rocket propellants containing polyurethane binders - Google Patents
Manufacture of bubble-free rocket propellants containing polyurethane bindersInfo
- Publication number
- DE977458C DE977458C DED36746A DED0036746A DE977458C DE 977458 C DE977458 C DE 977458C DE D36746 A DED36746 A DE D36746A DE D0036746 A DED0036746 A DE D0036746A DE 977458 C DE977458 C DE 977458C
- Authority
- DE
- Germany
- Prior art keywords
- bubble
- manufacture
- rocket propellants
- containing polyurethane
- polyurethane binders
- 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.)
- Expired
Links
- 239000003380 propellant Substances 0.000 title claims description 12
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 229920002635 polyurethane Polymers 0.000 title claims description 6
- 239000004814 polyurethane Substances 0.000 title claims description 6
- 239000011230 binding agent Substances 0.000 title claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- CRGZYKWWYNQGEC-UHFFFAOYSA-N magnesium;methanolate Chemical compound [Mg+2].[O-]C.[O-]C CRGZYKWWYNQGEC-UHFFFAOYSA-N 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 2
- 238000007792 addition Methods 0.000 claims 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 4
- 239000012948 isocyanate Substances 0.000 description 4
- 150000002513 isocyanates Chemical class 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 150000003673 urethanes Chemical class 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- GDDNTTHUKVNJRA-UHFFFAOYSA-N 3-bromo-3,3-difluoroprop-1-ene Chemical compound FC(F)(Br)C=C GDDNTTHUKVNJRA-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/088—Removal of water or carbon dioxide from the reaction mixture or reaction components
- C08G18/0885—Removal of water or carbon dioxide from the reaction mixture or reaction components using additives, e.g. absorbing agents
-
- 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
- C06B23/009—Wetting agents, hydrophobing agents, dehydrating agents, antistatic additives, viscosity improvers, antiagglomerating agents, grinding agents and other additives for working up
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Polyurethanes Or Polyureas (AREA)
Description
Herstellung von blas enfreien, Polyurethanbinder enthaltenden Raketentreibsätzen Bei der Herstellung von Raketentreibsätzen, besonders auf Basis von Ammonperchlorat, benutzt man mit Vorteil Polyurethane als Kunststoffbinder.Manufacture of bubble-free rocket propellants containing polyurethane binders at the production of rocket propellants, especially based on ammonium perchlorate, it is advantageous to use polyurethanes as plastic binders.
Diese besitzen in ihrer Einstellungsmöglichkeit eine sehr große Variationsbreite, sodaß je nach Rezeptur harte bis hochelastische Treibsätze erhalten werden können.These have a very wide range of settings in terms of their setting options, so that, depending on the recipe, hard to highly elastic propellants can be obtained.
Ein weiterer Vorteil ist, daß die Harzmischungen relativ niedrig viskos verwendet werden können und daß sich das Verhältnis Harzanteil zu Feststoff so einstellen läßt, daß man gießbare Mischungen erhält, die nach der Formgebung ausgehärtet werden können. Allen Polyurethantreibsätzen ist gemeinsam, daß zu ihrer Herstellung Verbindungen mit Isocyanatgruppen Verwendung finden. Another advantage is that the resin blends are relatively low viscous can be used and that the ratio of resin content to solids Can be adjusted in such a way that pourable mixtures are obtained after shaping can be cured. All polyurethane propellants have in common that their Production of compounds with isocyanate groups are used.
Diese Verwendung von Isocyanaten besitzt einen außerordentlichen und die Herstellung solcher Raketentreibsätze sehr erschwerenden Nachteil. Da Wasser mit Isocyanaten unter Bildung von Kohlendioxyd reagiert, so müssen alle Bestandteile des Treibsatzes vor ihrem Einsatz einer extremen Trocknung unterworfen werden. Die geringsten Spuren von Wasser resultieren in einer Gasbildung bei der Aushärtung. Da bekanntermaßen ein Treibsatz für eine einwandfreie Funktion keine Lunker und Blasen enthalten darf, so ist dieser Umstand der extremen Vortrocknung einer der schwierigsten Punkte bei der Verwendung von Polyurethanen als Binder. This use of isocyanates is extraordinary and the manufacture of such rocket propellants a very difficult disadvantage. Because water reacts with isocyanates to form carbon dioxide, all components must of the propellant must be subjected to extreme drying before they are used. the The slightest traces of water result in gas formation during curing. Since it is known that a propellant charge does not have any blowholes or cavities to function properly May contain bubbles, this fact of the extreme pre-drying is one of the most difficult points when using polyurethanes as binders.
Verwendet man Polyesterglykole als Reaktionspartner der Isocyanate, so tritt als weiterer erschwerender Umstand die noch stets vorhandenen Spuren freier Carboxylgruppen in Erscheinung. If polyester glycols are used as the reaction partner of the isocyanates, as a further aggravating circumstance, the traces that are still present appear more freely Carboxyl groups in appearance.
Auch Carboxylgruppen reagieren mit Isocyanaten unter Abspaltung von Kohlendioxyd. Die Verwendung von Polyesterurethanen ist somit mit noch größeren Schwierigkeiten verbunden, als sie bei den Polyätherurethanen gegeben sind.Carboxyl groups also react with isocyanates under Splitting off of carbon dioxide. The use of polyester urethanes is thus with connected with even greater difficulties than they were with the polyether urethanes are.
Es wurde nun gefunden, daß man die ohne extreme Vortrocknung der einzelnen Bestandteile der Treibsatzmischung von Spuren Wasser ebenso wie die aus dem Gehalt an Carboxylgruppen resultierende Gasentwicklung verhindern kann durch Zugabe geringer Mengen von Magnesium- und Alumininmalkoholaten. Am wirksamsten hat sich das Magnesiummethylat erwiesen. Das in den Treibsatzkomponenten noch enthaltene Wasser reagiert unter Bildung von Methanol und Magnesiumoxyd. It has now been found that the without extreme predrying of the individual components of the propellant mixture from traces of water as well as from the content of carboxyl groups can prevent gas evolution resulting from Addition of small amounts of magnesium and aluminum alcoholates. Has been most effective the magnesium methylate turned out to be. That still contained in the propellant components Water reacts to form methanol and magnesium oxide.
Methanol wird ohne Gasbildung an Isocyanatgruppen unter Bildung von Urethanen angelagert.Methanol is without gas formation at isocyanate groups with the formation of Accumulated urethanes.
Ebenso reagieren noch freie Carboxylgruppen unter Bildung von Magnesiumsalzen und Methanolabspaltung. Es genügen normalerweise 0,5 bis I,oO/o Magnesiummethylat, um auch ohne extreme Vortrocknung einen völlig blasenfreien Treibsatz zu erhalten.Free carboxyl groups also react to form magnesium salts and elimination of methanol. Normally, 0.5 to 1, oO / o magnesium methylate is sufficient, in order to obtain a completely bubble-free propellant even without extreme pre-drying.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DED36746A DE977458C (en) | 1961-08-06 | 1961-08-06 | Manufacture of bubble-free rocket propellants containing polyurethane binders |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DED36746A DE977458C (en) | 1961-08-06 | 1961-08-06 | Manufacture of bubble-free rocket propellants containing polyurethane binders |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE977458C true DE977458C (en) | 1966-06-23 |
Family
ID=7043267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DED36746A Expired DE977458C (en) | 1961-08-06 | 1961-08-06 | Manufacture of bubble-free rocket propellants containing polyurethane binders |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE977458C (en) |
-
1961
- 1961-08-06 DE DED36746A patent/DE977458C/en not_active Expired
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