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• • C—CHEMISTRY; METALLURGY
  • C06—EXPLOSIVES; MATCHES
  • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
  • C06C7/00—Non-electric detonators; Blasting caps; Primers
  • C06C7/02—Manufacture; Packing
• • 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
  • 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
  • C06B25/26—Compositions containing a nitrated organic compound the compound being nitrocellulose present as 10% or more by weight of the total composition with nitroglycerine with an organic non-explosive or an organic non-thermic component
• • C—CHEMISTRY; METALLURGY
  • C06—EXPLOSIVES; MATCHES
  • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
  • C06B33/00—Compositions containing particulate metal, alloy, boron, silicon, selenium or tellurium with at least one oxygen supplying material which is either a metal oxide or a salt, organic or inorganic, capable of yielding a metal oxide
• • C—CHEMISTRY; METALLURGY
  • C06—EXPLOSIVES; MATCHES
  • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
  • C06B33/00—Compositions containing particulate metal, alloy, boron, silicon, selenium or tellurium with at least one oxygen supplying material which is either a metal oxide or a salt, organic or inorganic, capable of yielding a metal oxide
  • C06B33/12—Compositions containing particulate metal, alloy, boron, silicon, selenium or tellurium with at least one oxygen supplying material which is either a metal oxide or a salt, organic or inorganic, capable of yielding a metal oxide the material being two or more oxygen-yielding compounds
• • 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
  • C06B45/12—Compositions or products which are defined by structure or arrangement of component of product having contiguous layers or zones

Definitions

• the pyrotechnic compositions may be alumino-thermal powders, therrntes, black powders or zirconium/barium chromate/ammonium perchlorate/ammonium bichromate, and the collodion may be a nitrocellulose or nitroglycerine powders (or mixtures of the two), or a plastics material, in solution in solvent.
• the present invention relates to a pyrotechnic lacquer used especially for producing ignition compositions for blocks of solid propellant and charges for gas generators.
• a lacquer which comprises a dispersion of: (a) a pyrotechnic composition in a tinely divided form, chosen from the group comprising aluminothermal powders (a mixture of potassium perchlorate and aluminium powder), ⁇ flo-called thermite powders (a mixture of potassium perchlorate, iron oxide and magnesium), black powder and powders based on zirconium, barium chromate, ammonium perchlorate or ammonium bichromate, in (b) a collodion containing either a powder based on nitrocellulose, on plasticized nitricellulose or on a mixture of nitrocellulose and nitroglycerine, dissolved in a volatile solvent for the said powder, especially a ketone solvent such as acetone or methyl ethyl ketone, or a plastics material dissolved in an organic solvent, especially polyethylene dissolved in trichloroethylene, polyvinyl chloride dissolved in methyl e
• the proportions in which the pyrotechnic composition and the collodion are used are from 5 to 99.5%, preferably from 40 to 60%, by weight for the former and from 95 to 0.5% and preferably 60 to 40%, by weight of the latter.
• the collodion preferably contains 75% by weight of powder or of plastics material and 25% of solvent.
• the pyrotechnic composition should preferably have a particle size of less than 500 microns.
• the pyrotechnic lacquer of the invention is especially useful as an ignition composition for blocks of solid propellant.
• That face of the block to be ignited is coated with a layer of the pyrotechnic lacquer and the solvent is evaporated.
• the ignition composition thus obtained can advantageously replace the conventional triggering box containing black powder, which is usually fixed by glue to a face of the propellant block and which can become detached and thereby cause spoilage of the guide system during ignition.
• the pyrotechnic lacquer according to the invention can also be used to produce pyrotechnic charges for gas generators of the type described in our French patent applications Nos. /44,837 and 70/44,838.
• the outer wall of the vaporizable liquid chamber of the gas generator is coated, partially or completely, with the pyrotechnic lacquer of the invention and the solvent is evaporated from the layer of lacquer.
• FIG. l is a cross-section in side elevation of a block of propellant provided with a layer of a lacquer of the invention
• PIG. 2 is a front elevation of the same block
• FIGS. 3 and 4 are graphs illustrating the results of experiments carried out in vacuo on the pyrotechnic lacquer and on the propellant:
• FIGS. 5 and 6 are graphs illustrating the ignition phase of tirings of the blocks of propellant of Examples 2 and 3, respectively.
• EXAMPLE 1 Preparation of the pyrotechnic composition 45 parts by weight of zirconium, 34 parts of barium chromate, 14 parts of ammonium perchlorate and 7 parts of ammonium bichromate were mixed together by means of a Moritz mixer running at low speed, for one hour.
• GB Tu powder a powder based on nitrocellulose and on nitroglycerine, in the ratio of 58:42, containing 1.1% of centralite as a stabilizer
• Preparation of the pyrotechnic lacquer 60 parts by weight of the pyrotechnic composition were mixed with 40 parts of collodion. Mixing was carried out in a climatically controlled area at 2l-29 C. and 30- 40% relative humidity.
• the pyrotechnical lacquer thus obtained was used to produce, by coating, an ignition composition on a block of Epictte propellant plasticized nitrocellulose and njtroglycerine) for frontal combustion, of which a crosssection in side elevation is shown in FIG. l of the accompanying drawing, and a front elevation in FIG. 2.
• This cylindrical block l diameter 78 mm., was perforated by an axial cylindrical channel 2, 1.5 mm. in diameter, and was covered with a layer of inhibitor 3 on its side wall, in the said channel and on its front face.
• the rear face 1a of this block was coated with a layer 4 of the pyrotechnic lacquer prepared above, 5 g. of this lacquer being uniformly spread over a ring of external diameter 60 mm. and internal diameter l0 mm.
• the layer of lacquer was thereafter dried in a climatically controlled area at 21-29 C. and at 30-40% relative humidity for several hours in order to produce, on this block of propellant, a layer of ignition composition of about 1 mm. thickness.
• Vacuum test This test was carried out at temperature of 90 C., 100 C. and 110 C.
• test sample for a test at a given temperature, was l g.
• Vacuum test-test on the pyrotechnic lacquer In view of the high sensitivity of the composition to mechanical pyrotechnic factors, this test was carried out on a dry mixture of 2 parts of the said pyrotechnic composition and of 3 parts of finely ground collodion slab.
• the study was based on ageing for two to six months at 60 C.
• the tests were carried out on four cubes of 25 mm. side length, of which one face was entirely coated with pyrotechnic lacquer to a thickness equivalent to that produced on the block of propellant.
• a test cycle comprised:
• EXAMPLE 2 A pyrotechnic lacquer was prepared by mixing 40 parts by weight of a thermite powder of the following composition:
• the graph in FIG. 5 shows the pressure in bars (as the ordinate) as a function of the period of combustion in seconds (as the abscissa), illustrating the ignition phase of a tiring using the block of propellant which was ignited by means of the pyrotechnic lacquer of this example, applied by coating.
• EXAMPLE 3 A pyrotechnic lacquer was prepared by mixing 40 parts by weight of blackpower with 60 parts of collodion of the type described in Example 1.
• the graph in FIG. 6 shows the pressure in bars (as the ordinate) as a function of the period of combustion in seconds (as the abscissa), illustrating the ignition phase of a firing using the block of propellant which was ignited by means of the pyrotechnic lacquer of this example, applied.
• EXAMPLE 4 A pyrotechnic lacquer was prepared by mixing 2 parts by weight of a thermite powder having the following composition:
• This lacquer was directly coated onto the outer wall of the vaporizable liquid chamber of the gas generator described in Belgian Pats. 775,997 and 775,422, both granted Dec. l5, 1971, to which correspond U.S. applications, Ser. No. 206,662 and Ser. No. 205,046, and was dried in a climatically controlled area at 2129 C. and at 30-40% relative humidity for several hours so as to yield a 2.25 mm. layer of a gas generator composition, as a replace ment of the charge of propellant in hollow strands, with which the said gas generator was equipped.
• a lacquer which comprises a dispersion of: (a) a pyrotechnic composition in finely divided form, selected from the group consisting of powders consisting of (l) ferrie oxide, magnesium and potassium perchlorate, (2) of black powder and (3) of powders consisting of zirconium, barium chromate, ammonium perchlorate and ammonium bichromate. in (b) a collodion which consists of a powder based on nitrocellulose and nitroglycerine cerine dissolved in a ketonic solvent, the dispersion containing from 40 to 60% by weight of the pyrotechnic composition, and from 60-40% by weight of said collodion.
• a lacquer according to claim 1 which comprises a dispersion of 3 parts by weight of a pyrotechnic composition consisting of zirconium, barium chromate, ammonium perchlorate and ammoium bichromate in the respective proportion 45:34: 14:7, in 2 parts by weight of a collodion consisting of 75% of a power based on nitrocellulose and nitroglycerine in the respective proportions of 58 to 42 and containing 1.1% of centralite and 25% of acetone.
• a pyrotechnic composition consisting of zirconium, barium chromate, ammonium perchlorate and ammoium bichromate in the respective proportion 45:34: 14:7
• a collodion consisting of 75% of a power based on nitrocellulose and nitroglycerine in the respective proportions of 58 to 42 and containing 1.1% of centralite and 25% of acetone.
• a lacquer according to claim 1 which comprises a dispersion of 2 parts by weight of a pyrotechnic composition consisting of FegOs, Mg and KCIO4 in the respective proportions 34:36:30 in 3 parts by weight of a collodion consisting of 75% of a powdei based on nitrocellulose and nitroglyoerine in the respective proportions of 58 to 42 and containing 1.1% of centralite and 25% of acetone.
• a lacquer according to claim 1 which comprises a dispersion of 2 parts by weight of a pyrotechnic composition consisting of black powder in 3 parts by weight of a collodion consisting of 75% of powder based on nitrocellulose and nitroglycerine in the respective proportions of 58 to 42 and containing 1.1% of centralite and 25% of acetone.
• a solid propellant grain having an ignition face coated with a layer of a lacquer which comprises a dispersion of: (a) a pyrotechnic composition, in finely divided form, selected from the group consisting of (1) powders consisting of ferrie oxide, magnesium and potassium perchlorate, (2) black powder and (3) powders consisting of zirconium, barium chromate, ammonium perchlorate and ammonium bichromate in (b) a collodion which consists of a powder based on mixtures of nitrocellulose and nitroglycerine, said powder being dissolved in a ketonic solvent, the dispersion containing from 40 to 60% by weight of the pyrotechnic composition and from 6() to 40% by weight of said collodion.
• a pyrotechnic composition in finely divided form, selected from the group consisting of (1) powders consisting of ferrie oxide, magnesium and potassium perchlorate, (2) black powder and (3) powders consisting of zirconium, barium chromate,
• a charge for a gas generator comprising a vaporizable liquid chamber having an outer wall, said charge consisting of a layer of lacquer coating said outer wall, said lacquer comprising a dispersion of: (a) a pyrotechnic composition, in nely divided form, selected from the group consisting of powders consisting of ferrie oxide, magnesium and potassium perchlorate, black powder and powders based on zirconium, barium chromate, ammonium perchlorate and ammonium bichromate in (b) a collodion which consists of a powder based on mixtures of nitrocellulose and nitroglycerine, said powder being dissolved in a ketonic solvent, the dispersion containing from 40 to 60% by weight of the pyrotechnic composition and from 60 to 40% by weight of collodion.
• a pyrotechnic composition in nely divided form, selected from the group consisting of powders consisting of ferrie oxide, magnesium and potassium perchlorate
• solvent is selected from acetone and methyl ethyl ketone. 15 149-8, 12, 38, 40, 42, 44, 65, 73, 76, 85

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Health & Medical Sciences (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Emergency Medicine (AREA)
• Crystallography & Structural Chemistry (AREA)
• Manufacturing & Machinery (AREA)
• Air Bags (AREA)
• Paints Or Removers (AREA)
• Agricultural Chemicals And Associated Chemicals (AREA)
• Compositions Of Macromolecular Compounds (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=9080540

Family Applications (1)

Country Status (17)

Cited By (11)

Families Citing this family (6)

• 0
  • BE BE786494D patent/BE786494A/xx not_active IP Right Cessation
• 1971
  • 1971-07-19 FR FR7126285A patent/FR2146555A5/fr not_active Expired
• 1972
  • 1972-07-10 IE IE969/72A patent/IE36547B1/xx unknown
  • 1972-07-11 LU LU65710A patent/LU65710A1/xx unknown
  • 1972-07-12 GB GB3256072A patent/GB1378789A/en not_active Expired
  • 1972-07-12 ZA ZA724771A patent/ZA724771B/xx unknown
  • 1972-07-14 AU AU44595/72A patent/AU464153B2/en not_active Expired
  • 1972-07-14 US US00271803A patent/US3794535A/en not_active Expired - Lifetime
  • 1972-07-17 ES ES404944A patent/ES404944A1/es not_active Expired
  • 1972-07-17 DK DK355172AA patent/DK130662B/da unknown
  • 1972-07-17 CA CA147,308A patent/CA987911A/en not_active Expired
  • 1972-07-18 SE SE7209430A patent/SE437149B/sv unknown
  • 1972-07-18 AR AR243125A patent/AR193278A1/es active
  • 1972-07-18 IT IT69331/72A patent/IT964715B/it active
  • 1972-07-18 NO NO02557/72A patent/NO130006B/no unknown
  • 1972-07-19 NL NL7209998A patent/NL7209998A/xx not_active Application Discontinuation
  • 1972-07-19 BR BR004788/72A patent/BR7204788D0/pt unknown

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