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| PROPELLANT STABILIZERS |
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The stability of nitrocellulose (NC) and nitroglycerine is inherently
poor and therefore the stability of NC based propellants is
correspondingly poor. The degradation of NC proceeds by two chemical
reactions.
In the first degradation reaction, NC loses nitrogen oxides. This reaction
is an intrinsic tendency of the NC molecule. In the second degradation
reaction, which occurs initially as a result of the first, the nitrogen
oxides that are formed attack the nitrocellulose molecule.
Nothing can be done to stop the first degradation reaction, but the second
degradation reaction can be controlled by including a chemical stabilizer
in the propellant composition. A stabilizer has a greater affinity for the
nitrogen oxides than NC, and therefore, absorbs the nitrogen oxide before
they can attack the NC molecule.
IPI supplies among others the following propellant stabilizers:
Diphenylamine (DPA)
DPA is used in single-based propellants. Since it is incompatible with
Nitroglycerin, it cannot be used in double-base and triple-base propellant
compositions. IPI offers material in accordance with
MIL-D-98A.
Dinitrotoluene (DNT)
Used as a stabilizer in single-base propellants. Also used as a ballistic
modifier (homogenizer) for single base propellants. IPI offers material in
accordance with MIL-D-204A.
Ethyl Centralite
Synonyms: Centralite I, symmetrical diethyl diphenylurea, Carbamite. It is
used as a stabilizer, gelatinizer, and waterproofing agent. Ethyl
Centralite can be used in relatively large proportions (up to 8%) of the
propellant composition. IPI offers material in accordance with
MIL-E-255A.
Methyl Centralite
Synonyms: Centralite II or symmetrical dimethyl diphenylurea. It is used
as a stabilizer in double-base and triple-base propellants. IPI offers
material in accordance with MIL-M-19719A.
Akardite II
Synonyms: Methyl Diphenyl Urea. Used as a stabilizer for multi-base
propellant and as a burning rate modifier. IPI offers material in
accordance with DOD-M-64040A.
2-Nitrodiphenylamine
Used for double-base and triple-base propellants which use Nitroglycerine
as the gelatinizing agent for the Nitrocellulose. IPI offers material in
accordance with MIL-N-3399B.
N-Methyl-P-Nitroaniline
(MNA)
Used as a stabilizer in the manufacture of solid fuel propellants. IPI
offers material in accordance with MIS-35107.
For a price quotation on the above materials, or for the complete product specification, please contact us at (516) 746-2100
| Island Pyrochemical Industries 267 East Jericho Turnpike Mineola, New York 11501 |
Telephone: 516-746-2100 Fax: 516-746-2405  |
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