Composite pyrotechnic product with non-crosslinked binder and method for preparing same

Patent metadata

Field	Value
Publication number	US-2016289133-A1
Application number	US-201415038116-A
Country	US
Kind code	A1
Filing date	Nov 21, 2014
Priority date	Nov 22, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

A composite pyrotechnic product, especially a propellant powder for barrel weapons, has a composition, expressed as weight percentages, that contains from 78% to 90% of organic energetic charges, and from 10% to 22% of a polymeric gum, chosen from polyurethane-polyester gums, polyurethane-polyether gums and mixtures thereof, the number-average molecular weight of which is greater than 20 000 g/mol and the Mooney viscosity of which is between 20 and 70 ML (5+4) at 100° C.

First claim

1 . A composite pyrotechnic product whose composition, expressed as weight percentages, contains:
from 78% to 90% of organic energetic charges, and from 10% to 22% of a polymeric gum, chosen from polyurethane-polyester gums, polyurethane-polyether gums and mixtures thereof, a number-average molecular weight of which is greater than 20 000 g/mol and a Mooney viscosity of which is between 20 and 70 ML (5+4) at 100° C.

2 . The composite pyrotechnic product as claimed in claim 1 , wherein said organic energetic charges consist of hexogen, octogen, nitroguanidine, ethylene dinitramine, N-guanylurea dinitramide, 1,1-diamino-2,2-dinitroethylene, bis(triaminoguanidinium) 5,5′-azotetrazolate, dihydrazinium 5,5′-azotetrazolate, 5,5′-bis(tetrazolyl)hydrazine, bis(2,2-dinitropropyl)nitramine, a nitropyrazole, or a mixture of such charges.

3 . The composite pyrotechnic product as claimed in claim 1 , wherein said organic energetic charges contain ethylene dinitramine charges.

4 . The composite pyrotechnic product as claimed in claim 1 , wherein said polymeric gum has a number-average molecular weight of greater than 50 000 g/mol.

5 . The composite pyrotechnic product as claimed in claim 1 , wherein said gum is a polyurethane-polyester gum or a polyurethane-polyether gum.

6 . The composite pyrotechnic product as claimed in claim 1 , wherein the composition also contains at least one energetic or non-energetic plasticizer; said plasticizer representing from 2% to 8% by weight of the composition of said pyrotechnic product.

7 . The composite pyrotechnic product as claimed in claim 6 , wherein said at least one plasticizer is an energetic plasticizer of nitrate and/or nitramine type.

8 . The composite pyrotechnic product as claimed in claim 7 , wherein said at least one plasticizer is chosen from diethylene glycol dinitrate, triethylene glycol dinitrate, butanetriol trinitrate, trimethylolethane trinitrate, a mixture of 2,4-dinitro-2,4-diazapentane, 2,4-dinitro-2,4-diazahexane and 3,5-dinitro-3,5-diazaheptane, nitratoethylnitramines, and mixtures thereof.

9 . The composite pyrotechnic product as claimed in claim 1 , wherein the composition also contains from 0.1% to 2% by weight of at least one additive.

10 . The composite pyrotechnic product as claimed in claim 1 , wherein the composite pyrotechnic product consists of a propellant powder for barrel weapons.

11 . A process for preparing at least one composite pyrotechnic product as claimed in claim 1 , the process comprising:
a) providing the ingredients below:
organic energetic charges,
a polymeric gum, chosen from polyurethane-polyester gums, polyurethane-polyether gums and mixtures thereof, a number-average molecular weight of which is greater than 20 000 g/mol and a Mooney viscosity of which is between 20 and 70 ML (5+4) at 100° C.;
b) mixing the ingredients in suitable proportions relative to the desired composition of the final product, to produce a pasty mixture; and
c) producing, from said pasty mixture, said at least one composite pyrotechnic product in a desired form.

12 . The process as claimed in claim 11 , further comprising providing at least one energetic or non-energetic plasticizer and/or at least one additive, and mixing of said charges and gum with said at least one plasticizer and/or said at least one additive to obtain a pasty mixture.

13 . The process as claimed in claim 11 , wherein said mixture is prepared with a twin-screw extruder or a two-roll mill.

14 . The process as claimed in claim 11 , wherein said mixture is prepared at a temperature of between 60° C. and 120° C.

15 . The process as claimed in claim 11 , wherein said at least one composite pyrotechnic product is obtained by spinning or calendering.

16 . The composite pyrotechnic product as claimed in claim 1 , wherein the composition, expressed as weight percentages, contains from 80% to 86% of organic energetic charges.

17 . The composite pyrotechnic product as claimed in claim 3 , wherein said organic energetic charges contain hexogen charges and ethylene dinitramine charges.

18 . The composite pyrotechnic product as claimed in claim 4 , wherein said polymeric gum has a number-average molecular weight of greater than 75 000 g/mol.

19 . The composite pyrotechnic product as claimed in claim 5 , wherein said gum is a polyurethane-polyester gum.

20 . The composite pyrotechnic product as claimed in claim 6 , wherein the composition further contains an energetic plasticizer.

Assignees

• Herakles
• Eurenco France

Inventors

• Desgardin Nancy
• Ragon Philippe
• Werschine Mathieu W
• Carayon Caroline
• Paulin Jean-Louis

Classifications

• C06B45/10 Primary

  the organic component containing a resin · CPC title

• C06B21/0025

  the ingredient being a polymer bonded explosive or thermic component · CPC title