GB1600576A - Pyrotechnic compositions - Google Patents
Pyrotechnic compositions Download PDFInfo
- Publication number
- GB1600576A GB1600576A GB17619/78A GB1761978A GB1600576A GB 1600576 A GB1600576 A GB 1600576A GB 17619/78 A GB17619/78 A GB 17619/78A GB 1761978 A GB1761978 A GB 1761978A GB 1600576 A GB1600576 A GB 1600576A
- Authority
- GB
- United Kingdom
- Prior art keywords
- granulating
- granules
- polytetrafluoroethylene
- fluoroelastomer
- acetone
- 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
- 239000000203 mixture Substances 0.000 title claims description 27
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 44
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 29
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 29
- 229940058401 polytetrafluoroethylene Drugs 0.000 claims description 29
- -1 polytetrafluoroethylene Polymers 0.000 claims description 26
- 239000008187 granular material Substances 0.000 claims description 19
- 229920001973 fluoroelastomer Polymers 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 18
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- 239000012065 filter cake Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- 229930195733 hydrocarbon Natural products 0.000 claims description 9
- 150000002430 hydrocarbons Chemical class 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 8
- 239000000084 colloidal system Substances 0.000 claims description 8
- 239000003979 granulating agent Substances 0.000 claims description 8
- 239000004215 Carbon black (E152) Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- 239000011777 magnesium Substances 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000007873 sieving Methods 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 238000007664 blowing Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000009826 distribution Methods 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 claims description 2
- 230000008020 evaporation Effects 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 230000001050 lubricating effect Effects 0.000 claims description 2
- 239000013557 residual solvent Substances 0.000 claims description 2
- 230000000979 retarding effect Effects 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
- C06B21/0008—Compounding the ingredient
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B27/00—Compositions containing a metal, boron, silicon, selenium or tellurium or mixtures, intercompounds or hydrides thereof, and hydrocarbons or halogenated hydrocarbons
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Dispersion Chemistry (AREA)
- Molecular Biology (AREA)
- Crystallography & Structural Chemistry (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Lubricants (AREA)
Description
(54) PYROTECHNIC COMPOSITIONS
(71) We, WERKZEUGMASCHINEN
FABRIK OERLIKON-BUHRLE AG, a company organised and existing under the laws of Switzerland of Birchstrasse 155, CH8050 Zurich, Switzerland, do hereby declare the invention for which we pray that a patent may be granted to us and the method by which it is to be performed to be particularly described in and by the following statement:- This invention relates to a process for the manufacture of a pyrotechnic composition.
According to a known process, a pyrotechnic composition containing, by weight, 300/0-68V0 of magnesium powder, 30%--60% of polytetrafluoroethylene powder and 2%--4% of a fluoroelastomer, is manufactured by suspending the magnesium powder and polytetrafluoroethylene powder in acetone and premixing them, homogenising the premix by circulating with acetone, filtering the homogenised premix and largely freeing it from the auxiliary medium acetone, granulating the filter cake and drying the granules.
A known pyrotechnic material of this type, disclosed in Swiss Patent
Specification No. 512 406, contains. by weight, 51% of atomised magnesium having a particle size finer than 75 ,u, 34% of polytetrafluoroethylene powder and 15% of a polytetrafluoroethylene telomer.
It has been found that difficulties arise in the manufacture and processing of a pyrotechnic material of this type. In particular, difficulties arise on granulation since granules of this type readily disintegrate after drying.
According to the present invention there is provided a process for the manufacture of a pyrotechnic composition containing, by weight, 30 Ó68 ó of magnesium powder, 30%--600,; of polytetrafluoroethylene powder and 2 ó4 Ó of a fluoroelastomer or a polytetrafluoroethylene telomer, which comprises::
a) suspending the magnesium powder and polytetrafluoroethylene powder in acetone and premixing them;
b) homogenising the premix by passage
through a colloid mill which runs in
circulation with acetone;
c) filtering the homogenised premix and
largely freeing it from the auxiliary medium
acetone;
d) mixing the filter cake with a
granulating solution which contains the fluoroelasto mer or polytetrafluoroethylene
telomer;
e) adding a hydrocarbon as a granulating
aid to the mixture after the acetone has
evaporated; and
f) granulating the filter cake and drying
the granules by intense mixing.
Referring is made to the accompanying
drawing, the sole figure of which shows a
schematic representation of the
manufacturing process.
According to a preferable embodiment of
the invention, the process comprises the
following steps:
1) 568 g of magnesium powder (trade
description Metallic Magnesium Atomized Powder-325 Mesh) and 392 g of polytetra
fluoroethylene (trade description Teflon TE 801-N) are weighed into a plastic beaker
10, for example a polypropylene beaker of
about 5,000 cm3 capacity, about 1,000 cm3
of acetone are added by pouring in and the
mixture is gently stirred with a wooden
spatula 11.
2) l his premlx Is nomogemsed m a colloid mill 12. The colloid mill 12 runs with
circulation. Initially, about 1,000 cm3 of acetone must be poured into the colloid mill
12 and pumped around in the circulation 13.
Subsequently, the premix can be filled into the colloid mill 12. A dispersion is thus formed.
3) The homogenised premix passes into a pressure filter 14 which is located underneath a drain cock 15 of the colloid mill 12. As soon as the premix is in the pressure filter 14, the drain cock 15 is closed and a pressure of about 0.5 atmospheres gauge is generated, whereby the premix is freed from acetone.
4) The filter cake passes into a planetary mixer unit 16. 400 g of a fluoroelastomer (trade description Vitron B) are added as a granulating solution to the filter cake present in the mixing vat of the planetary mixer unit and the mixer unit is started up.
At the same time, oil-free, water-free compressed air is blown as an evaporation aid into the mixing vat. As soon as the mixture has reached a sandy consistency, the first mixing step is ended.
5) With the mixer unit at a standstill, 150 cm3 of a hydrocarbon (heptane) are added as a granulating aid and the mixer unit is switched on again. The second mixing step is ended as soon as the mixture again has a sandy consistency.
6) Subsequently, the mixture passes into a granulating apparatus 17. For example, a sieving machine is used as the granulating apparatus 17.
7) The granules pass from the sieving machine into a vacuum drier 18 which is heated by hot water, and drying is carried out for about 4 hours at a temperature of 600-()C. Subsequently, air is admitted to the vacuum driver 18, the air being passed over an ioniser.
8) The dried, somewhat agglomerated granules are comminuted in a separating machine 19. This separating of the agglomerated cakes of granules takes about 10 minutes.
In order to obtain as homogenous a mixture as possible, the materials are used in pulverulent form, the particle size being smaller than 50 ,u. The solvent in the granulating solution must not enter into a reaction with any of the other components used and must not have a dissolving effect on them. The granulating agent is a substance which actively participates in the combustion reaction and does not have any effect of reducing the light intensity or retarding the combustion reaction. In place of a fluoroelastomer, it is also possible to use a polytetrafluoroethylene telomer. The fluoroelastomer must first be dissolved, preferably in acetone. The granulating agent must be taken into account in the stoichiometry of the total mixture. The excess solvent (acetone) can be removed by blowing in compressed air or by means of a vacuum.Intense mixing is necessary during the drying step in order to achieve a homogeneous distributions of the granulatinnagent.
Since these operations can be carried out under remote control and since the polytetrafluoroethylene has good lubricating properties in the dry state, the mixtures can be dried down to eliminate the actone. The adhesive properties of a solution containing fluoroelastomer or polytetrafluoroethylene would make efficient mixing more difficult.
To suppress the adhesive properties behaviour of the said agents, a readily volatile hydrocarbon, for example heptane, is temporarily added, that is to say only for the granulating step. Moreover, lower hydrocarbons even enhance the sliding properties of polytetrafluoroethylene so that conventional sieve granulators and extrusion granulators can be used without difficulty. After the granules have been dried off, the adhesive behaviour of the granulating agent returns and ensures good mechanical properties of the granules.
Residual solvents are removed in the vacuum oven. Depending on the proportion of granulating agent, the dried granules can be further processed immediately. Slightly caked granules must be separated using a mechanical separator.
The following are examples of compositions manufactured in this way: 1) 58% by weight of magnesium of a
particle size smaller than 50 p 40% by weight of polytetrafluoro
ethylene powder
2% by weight of a fluoroelastomer.
2) 58% by weight of magnesium of a
particle size smaller than 28 Er 38% by weight of polytetrafluoro
ethylene powder
4% by weight of a fluoroelastomer.
WHAT WE CLAIM IS:
1. A process for the manufacture of a pyrotechnic composition containing, by weight, 30%68% of magnesium powder, 30%60% of polytetrafluoroethylene powder and 2%4% of a fluoroelastomer or a polytetrafluoroethylene telomer, which comprises:
a) suspending the magnesium powder and polytetrafluoroethylene powder in acetone and premixing them;
b) homogenising the premix by passage through a colloid mill which runs in circulation with acetone;
c) filtering the homogenised premix and largely freeing it from the auxiliary medium acetone;
d) mixing the filter cake with a granulating solution which contains the fluoroelastomer or polytetrafluoroethylene telomer;
e) adding a hydrocarbon as a granulating aid to the mixture after the acetone has evaporated; and
f) granulating the filter cake and drying the granules by intense mixing.
2. A process according to Claim 1, wherein the homogenising of the components is carried out in a dispersion using a homogenising and dispersing machine.
3. A process according to Claim 1 or 2, wherein the powders have a particle size less than 50 ,u.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (1)
- **WARNING** start of CLMS field may overlap end of DESC **.(trade description Vitron B) are added as a granulating solution to the filter cake present in the mixing vat of the planetary mixer unit and the mixer unit is started up.At the same time, oil-free, water-free compressed air is blown as an evaporation aid into the mixing vat. As soon as the mixture has reached a sandy consistency, the first mixing step is ended.5) With the mixer unit at a standstill, 150 cm3 of a hydrocarbon (heptane) are added as a granulating aid and the mixer unit is switched on again. The second mixing step is ended as soon as the mixture again has a sandy consistency.6) Subsequently, the mixture passes into a granulating apparatus 17. For example, a sieving machine is used as the granulating apparatus 17.7) The granules pass from the sieving machine into a vacuum drier 18 which is heated by hot water, and drying is carried out for about 4 hours at a temperature of 600-()C. Subsequently, air is admitted to the vacuum driver 18, the air being passed over an ioniser.8) The dried, somewhat agglomerated granules are comminuted in a separating machine 19. This separating of the agglomerated cakes of granules takes about 10 minutes.In order to obtain as homogenous a mixture as possible, the materials are used in pulverulent form, the particle size being smaller than 50 ,u. The solvent in the granulating solution must not enter into a reaction with any of the other components used and must not have a dissolving effect on them. The granulating agent is a substance which actively participates in the combustion reaction and does not have any effect of reducing the light intensity or retarding the combustion reaction. In place of a fluoroelastomer, it is also possible to use a polytetrafluoroethylene telomer. The fluoroelastomer must first be dissolved, preferably in acetone. The granulating agent must be taken into account in the stoichiometry of the total mixture. The excess solvent (acetone) can be removed by blowing in compressed air or by means of a vacuum.Intense mixing is necessary during the drying step in order to achieve a homogeneous distributions of the granulatinnagent.Since these operations can be carried out under remote control and since the polytetrafluoroethylene has good lubricating properties in the dry state, the mixtures can be dried down to eliminate the actone. The adhesive properties of a solution containing fluoroelastomer or polytetrafluoroethylene would make efficient mixing more difficult.To suppress the adhesive properties behaviour of the said agents, a readily volatile hydrocarbon, for example heptane, is temporarily added, that is to say only for the granulating step. Moreover, lower hydrocarbons even enhance the sliding properties of polytetrafluoroethylene so that conventional sieve granulators and extrusion granulators can be used without difficulty. After the granules have been dried off, the adhesive behaviour of the granulating agent returns and ensures good mechanical properties of the granules.Residual solvents are removed in the vacuum oven. Depending on the proportion of granulating agent, the dried granules can be further processed immediately. Slightly caked granules must be separated using a mechanical separator.The following are examples of compositions manufactured in this way: 1) 58% by weight of magnesium of a particle size smaller than 50 p 40% by weight of polytetrafluoro ethylene powder 2% by weight of a fluoroelastomer.2) 58% by weight of magnesium of a particle size smaller than 28 Er 38% by weight of polytetrafluoro ethylene powder 4% by weight of a fluoroelastomer.WHAT WE CLAIM IS: 1. A process for the manufacture of a pyrotechnic composition containing, by weight, 30%68% of magnesium powder, 30%60% of polytetrafluoroethylene powder and 2%4% of a fluoroelastomer or a polytetrafluoroethylene telomer, which comprises: a) suspending the magnesium powder and polytetrafluoroethylene powder in acetone and premixing them; b) homogenising the premix by passage through a colloid mill which runs in circulation with acetone; c) filtering the homogenised premix and largely freeing it from the auxiliary medium acetone; d) mixing the filter cake with a granulating solution which contains the fluoroelastomer or polytetrafluoroethylene telomer; e) adding a hydrocarbon as a granulating aid to the mixture after the acetone has evaporated; and f) granulating the filter cake and drying the granules by intense mixing.2. A process according to Claim 1, wherein the homogenising of the components is carried out in a dispersion using a homogenising and dispersing machine.3. A process according to Claim 1 or 2, wherein the powders have a particle size less than 50 ,u.4. A process for the manufacture of apyrotechnic composition, substantially as described herein and as described with reference to the accompanying drawing.5. A pyrotechnic composition, when manufactured by a process according to any preceding claim.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH569477A CH596111A5 (en) | 1977-05-06 | 1977-05-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1600576A true GB1600576A (en) | 1981-10-21 |
Family
ID=4297824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB17619/78A Expired GB1600576A (en) | 1977-05-06 | 1978-05-04 | Pyrotechnic compositions |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5817153B2 (en) |
| BE (1) | BE866456A (en) |
| CH (1) | CH596111A5 (en) |
| DE (1) | DE2817642C3 (en) |
| FR (1) | FR2389867B1 (en) |
| GB (1) | GB1600576A (en) |
| IT (1) | IT1095750B (en) |
| NL (1) | NL180744C (en) |
| SE (1) | SE7805102L (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2310427A (en) * | 1996-02-22 | 1997-08-27 | John Douglas Michael Wraige | Pyrotechnic compositions |
| CN111272022A (en) * | 2020-02-06 | 2020-06-12 | 雍和平 | Water method production process of fireworks |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2471959A1 (en) * | 1979-12-19 | 1981-06-26 | France Etat | Castable, lighting, pyrotechnic compsn. - comprising inorganic oxidant, pref. magnesium powder and aminoplast or phenoplast resin binder |
| SE449648B (en) * | 1981-06-17 | 1987-05-11 | Volvo Ab | FORBRENNINGSMOTOR |
| JPS6056578A (en) * | 1983-09-09 | 1985-04-02 | Usac Electronics Ind Co Ltd | Printer apparatus |
| JPS6072771A (en) * | 1983-09-30 | 1985-04-24 | Fujitsu Ltd | Cut sheet feeder |
| JPH0747167Y2 (en) * | 1989-02-09 | 1995-11-01 | 住友重機械工業株式会社 | Oil supply device for slab supporting rolls for continuous casting equipment |
-
1977
- 1977-05-06 CH CH569477A patent/CH596111A5/xx not_active IP Right Cessation
-
1978
- 1978-04-21 DE DE2817642A patent/DE2817642C3/en not_active Expired
- 1978-04-27 BE BE187174A patent/BE866456A/en not_active IP Right Cessation
- 1978-05-03 IT IT22964/78A patent/IT1095750B/en active
- 1978-05-03 SE SE7805102A patent/SE7805102L/en unknown
- 1978-05-04 JP JP53052840A patent/JPS5817153B2/en not_active Expired
- 1978-05-04 GB GB17619/78A patent/GB1600576A/en not_active Expired
- 1978-05-08 FR FR7813552A patent/FR2389867B1/fr not_active Expired
- 1978-05-08 NL NLAANVRAGE7804934,A patent/NL180744C/en not_active IP Right Cessation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2310427A (en) * | 1996-02-22 | 1997-08-27 | John Douglas Michael Wraige | Pyrotechnic compositions |
| GB2310427B (en) * | 1996-02-22 | 2000-06-28 | John Douglas Michael Wraige | Energetic compositions |
| CN111272022A (en) * | 2020-02-06 | 2020-06-12 | 雍和平 | Water method production process of fireworks |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5817153B2 (en) | 1983-04-05 |
| IT7822964A0 (en) | 1978-05-03 |
| FR2389867B1 (en) | 1981-07-31 |
| CH596111A5 (en) | 1978-02-28 |
| SE7805102L (en) | 1978-11-07 |
| NL180744B (en) | 1986-11-17 |
| NL7804934A (en) | 1978-11-08 |
| JPS5417106A (en) | 1979-02-08 |
| BE866456A (en) | 1978-08-14 |
| DE2817642C3 (en) | 1980-02-07 |
| DE2817642B2 (en) | 1979-06-07 |
| NL180744C (en) | 1987-04-16 |
| DE2817642A1 (en) | 1978-11-09 |
| FR2389867A1 (en) | 1978-12-01 |
| IT1095750B (en) | 1985-08-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19980503 |