Accession Number : ADD004441

Title :   Coating Composition and Method for Improving Propellant Tear Strength.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Elrick,Donald E

Report Date : 11 Oct 1977

Pagination or Media Count : 5

Abstract : A typical rocket motor includes a motor casing containing a cast propellant bonded to the casing and provided with a port through which combustion gases are delivered to the motor nozzle. During storage and operation, mechanical stresses in the propellant may produce tears resulting in motor malfunctions. Tear strength can be increased by reactively forming on selected port surface areas a thin-film cross-linked polymeric gel coating formed essentially of a highly functional polyglycol adipate and a polyfunctional isocyanate. Cross-linking with the propellant can be achieved by controlling the hydroxyl to isocyanate ratios of the coating and the propellant. The coating is particularly useful on XLDB (cross-linked, composite-modified double base) and on CMDB (Composite-modified double-base) propellants. (Author)

Descriptors :   *Patents, *Solid rocket propellants, *Double base rocket propellants, *Composite propellants, Thin films, Polymeric films, Tearing, Strength(Mechanics), Gels, Crosslinking(Chemistry), Hydroxyl radicals, Polyurethane resins

Subject Categories : Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE