Explosive and thermic compositions or charges – Structure or arrangement of component or product – Solid particles dispersed in solid solution or matrix
Patent
1984-11-07
1985-07-23
Lechert, Jr., Stephen J.
Explosive and thermic compositions or charges
Structure or arrangement of component or product
Solid particles dispersed in solid solution or matrix
149 15, 149 21, 149 38, 149 42, 149 76, 149 92, 149 98, 149113, 149114, 102285, 102289, 102290, C06B 4510
Patent
active
045307288
ABSTRACT:
An embedment system with controlled shrinkage for use with a composite-modified double-base propellant composition which is comprised of an embedment granule portion in percent by weight of nitrocellulose of about 23.0, nitroglycerine of about 8.8-13.8, triacetin of about 1.2, bisspiro orthocarbonate from about 2.5-5.0, resorcinol of about 1.5, 2-nitrodiphenylamine of about 1.0, ammonium perchlorate (10 micrometers) of about 48.5 and aluminum powder (20 micrometers) of about 10.0 and an embedment resin portion in percent by weight of bisphenol A-epichlorohydrin of about 50.0, epoxidized dimer acid of about 50.0, and a curative which is comprised of equal parts mixture of methylenedianiline, m-phenylenediamine, and i-propyl-m-phenylenediamine with an added accelerator of 2,4-dinitrophenol. This embedment system employs a specific bisspiro orthocarbonate, 3,9-bis(5'-norbornene-2'-yl)-1,5,7,11-tetraoxaspiro[5.5]undecane, which effects elimination or reduction of amount of shrinkage that the resin undergoes during curing. As a result, the embedment granules are more securely locked into the embedment resin. On solvation, the casebond tensile strength and peel strength are markedly improved, and casebond failures attributable to the pulling out of the embedment granules from the embedment resin does not take place. In this system, the failure occurs within the propellant during pull and peel tests.
REFERENCES:
patent: 3965676 (1976-06-01), Schaffling
patent: 4029529 (1977-06-01), Elrick
patent: 4131051 (1978-12-01), Schaffling
patent: 4441942 (1984-04-01), Sayles
Bailey, W. J. et al, Journal of Poly. Sc: Poly. Chem. Ed., vol. 14, pp. 1-1741, (1976).
Gibson Robert P.
Lane Anthony T.
Lechert Jr. Stephen J.
The United States of America as represented by the Secretary of
Voigt Jack W.
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