EP0032080B1 - Composition pyrotechnique éclairante colorée à taux élevé de composé émissif - Google Patents

Composition pyrotechnique éclairante colorée à taux élevé de composé émissif Download PDF

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Publication number
EP0032080B1
EP0032080B1 EP19800401771 EP80401771A EP0032080B1 EP 0032080 B1 EP0032080 B1 EP 0032080B1 EP 19800401771 EP19800401771 EP 19800401771 EP 80401771 A EP80401771 A EP 80401771A EP 0032080 B1 EP0032080 B1 EP 0032080B1
Authority
EP
European Patent Office
Prior art keywords
composition
weight
composition according
emissive
oxidising agent
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
Application number
EP19800401771
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0032080A1 (fr
Inventor
Jean-Philippe Godfrin
Lucien Autret
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Societe Nationale des Poudres et Explosifs
Original Assignee
Societe Nationale des Poudres et Explosifs
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Societe Nationale des Poudres et Explosifs filed Critical Societe Nationale des Poudres et Explosifs
Publication of EP0032080A1 publication Critical patent/EP0032080A1/fr
Application granted granted Critical
Publication of EP0032080B1 publication Critical patent/EP0032080B1/fr
Expired legal-status Critical Current

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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
    • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
    • C06C15/00—Pyrophoric compositions; Flints

Definitions

  • the invention relates to illuminating compositions intended for use in pyrotechnic articles such as Bengal lights, signal flares or party devices, such compositions comprising a binder, a solid oxidant, an emissive compound and possibly a fuel. metallic.
  • Illuminating pyrotechnic compositions produced from polymerizable organic binders are known and most of these compositions have been formulated in order to obtain an intense luminosity, which requires the use of a high level of a metallic fuel for combustion. bright like magnesium.
  • These formulations most often lead to compositions in which the flame emits only an impure coloring, the luminous efficacy of magnesium being greater than the luminous efficacy of emissive salts such as alkali or alkaline earth nitrates, and in which the combustion produces abundant smoke and rigid slag, which is particularly troublesome in certain applications such as the production of Bengal fires.
  • the object of the present invention is to obtain an illuminating composition whose flame has a lively and pure coloring while obtaining very slow combustion speeds, less than 1 mm / second, which makes it possible to produce pyrotechnic articles of small bulk which generate a very colorful and very visible flame despite the relative decrease in the value of the luminous efficiency due to the absence of a metal with strong combustion, this decrease in the luminous efficiency being compensated by a more vivid and more pronounced coloring , by the significant reduction in fumes hampering the visibility of the flame, the porosity and the fragility of the slag produced allowing a better distribution of the emissive flame.
  • the invention is characterized in that the proportion by weight of the assembly consisting of the solid oxidant and the emissive compound is between 75 and 90% of the total weight of the composition, the weight of the emissive compound being greater than the weight of the solid oxidant and the metal fuel rate being less than 5% of the total weight of the composition.
  • the weight of the emissive compound is greater than one and a half times the weight of the solid oxidant.
  • the polyurethane binder is produced from at least one triisocyanate reacting on at least one polyhydroxy compound, this compound preferably having no hydroxyl group on aromatic rings. It is possible to use a polyisocyanate and a hydroxylated compound in non-stoichiometric proportions, the excess of hydroxyl groups leading to a more flexible polyurethane, and it is also possible to use a known plasticizer, such as phthalate butyl, to soften the pyrotechnic composition.
  • Polyurethanes which are particularly suitable in the context of the invention have been produced from polyisocyanates sold under the name "DESMODUR” which are products of the company BAYER, hydroxylated compounds such as castor oil and / or the product sold under the name "DESMOPHEN” by the company BAYER, making it possible to obtain satisfactory binders after polymerization at room temperature.
  • DESMODUR polyisocyanates sold under the name "DESMODUR” which are products of the company BAYER
  • hydroxylated compounds such as castor oil and / or the product sold under the name "DESMOPHEN" by the company BAYER
  • the solid oxidant is preferably chosen from the group consisting of chlorates and perchlorates of alkaline character, that is to say chlorates and perchlorates of alkali, alkaline earth, or incidentally ammonium, and can be constituted by a single one of these oxidizing compounds or by a mixture of these compounds, the alkaline perchlorates being advantageously used for reasons of safety and efficiency, and potassium perchlorate being industrially the most suitable oxidizing compound.
  • the emissive compound is preferably chosen from the group consisting of nitrates and alkali or alkaline earth emissive nitrites, that is to say essentially nitrates and nitrites of sodium, strontium or barium according to the desired coloration, and this emissive compound may consist of only one of these salts or a mixture of these salts.
  • the pyrotechnic illuminating compositions according to the invention preferably do not contain metallic fuel such as magnesium, it is however possible to incorporate a small amount of such a metal, provided that the proportion by weight of the whole consisting of the oxidizing agent and the emissive compound is between 75 and 90% of the total weight of the composition, and it is advantageous for this metal with strong combustion to have a very fine particle size.
  • composition No. 1 burns faster than composition No. 1 and therefore has a greater instantaneous luminosity, the slightly larger flame always having a bright red coloration.
  • This composition has a much greater hardness than the previous compositions and burns with a well-colored yellow flame. Its hardness can be reduced by adding a plasticizer of the butyl phthalate type, but such an addition decreases the rate of combustion and must be limited to 4% by weight, since the composition then becomes too flexible.
  • This composition is very flexible and greater hardness can be obtained by reducing the level of binder, such a reduction resulting in a slight increase in the rate of combustion.
  • This composition burns with a bright red flame in approximately the same conditions as the previous composition.
  • the burning rate is 0.5 mm / second and is therefore of the same order of magnitude as the combustion rate of the composition No. 4, but the flame has a greater coloring, the weight of strontium nitrate being in this case equal to 2.5 times the weight of potassium perchlorate, this more marked coloring being very noticeable as soon as this weight ratio is greater than 2.
  • compositions according to the invention can be prepared by the implementation of conventional mixing processes without solvent, then casting or extrusion at low pressure, the polymerization being able to be carried out at room temperature.
  • the low pressure extrusion or the injection in particular allow shaping directly inside an inhibitor tube which is deployed under the effect of the push of the injected composition.
  • the inhibited cylinders thus obtained can be several meters in length and be cut off or cut into elements of different lengths, one of the sections being able to be subsequently inhibited in order to constitute, for example, a signaling torch or a Bengal light.
  • the lighting pyrotechnic compositions according to the invention can be used for the production of all lighting pyrotechnic articles, both in the field of safety and signaling as in the field of fireworks display.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Molecular Biology (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Air Bags (AREA)
EP19800401771 1979-12-19 1980-12-10 Composition pyrotechnique éclairante colorée à taux élevé de composé émissif Expired EP0032080B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7931127 1979-12-19
FR7931127A FR2471960A1 (fr) 1979-12-19 1979-12-19 Composition pyrotechnique eclairante coloree a taux eleve de compose emissif

Publications (2)

Publication Number Publication Date
EP0032080A1 EP0032080A1 (fr) 1981-07-15
EP0032080B1 true EP0032080B1 (fr) 1983-11-09

Family

ID=9232948

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800401771 Expired EP0032080B1 (fr) 1979-12-19 1980-12-10 Composition pyrotechnique éclairante colorée à taux élevé de composé émissif

Country Status (4)

Country Link
EP (1) EP0032080B1 (enExample)
DE (1) DE3065560D1 (enExample)
ES (1) ES497753A0 (enExample)
FR (1) FR2471960A1 (enExample)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1047161C (zh) * 1993-12-11 1999-12-08 中国科学院上海有机化学研究所 一种高亮度和高密度的发光焰火药、制造方法及其用途

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB881731A (en) * 1957-02-18 1961-11-08 Herbert Walter Chatfield Improvements in or relating to pyrotechnic compositions
DE1156690B (de) * 1962-02-12 1963-10-31 Josef Schaberger & Co G M B H Schwimm- und in Wasser brennfaehiger Nebelsatz
US3705828A (en) * 1971-04-05 1972-12-12 Us Army Process to increase filler content of castable explosives,pyrotechnics,or propellants

Also Published As

Publication number Publication date
FR2471960A1 (fr) 1981-06-26
EP0032080A1 (fr) 1981-07-15
ES8200317A1 (es) 1981-11-01
FR2471960B1 (enExample) 1983-01-21
ES497753A0 (es) 1981-11-01
DE3065560D1 (en) 1983-12-15

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