Process for forming a liner and cast propellant charge in a rock

Details Process for forming a liner and cast propellant charge in a rock Process for forming a liner and cast propellant charge in a rock

1984-02-10

1989-02-07

Miller, Edward A.

Plastic and nonmetallic article shaping or treating: processes

Explosive or propellant article shaping or treating

102290, 149 194, 149 199, 149 1992, C06B 2100

Patent

active

048030198

ABSTRACT:
Process for forming a liner and cast propellant charge in a rocket engine casing without separately precuring the liner, comprising the steps of providing a blocked curable liner composition which is the reaction product of a prepolymer, an isocyanate curing agent, and a blocking agent; applying the liner composition to an internal surface of a rocket casing; preheating the casing and liner assembly to simultaneously prepare the assembly for receiving a propellant, unblock the liner, and precure the liner to a tacky state; casting the propellant change into interfacial contact with the liner; and cocuring the liner and propellant compositions. The blocked, curable liner composition has a very long pot life which is terminated by heating the composition sufficiently to uncouple the blocking agent from the isocyanate curing agent and initiate a rapid cure. The liner composition does not require precuring, as it is unblocked by preheating the liner and rocket casing sufficiently to receive to cast propellant. The blocked liner composition has the following structure. ##STR1##

REFERENCES:
patent: 3046829 (1962-07-01), Roemer
patent: 3188962 (1965-06-01), Mosher
patent: 3433158 (1969-03-01), Pierce
patent: 3798090 (1974-03-01), Allabashi
patent: 4021514 (1977-07-01), Daume
patent: 4098626 (1978-07-01), Graham et al.
patent: 4337218 (1982-06-01), Byrd et al.
patent: 4429634 (1984-02-01), Byrd et al.
patent: 4601862 (1986-07-01), Byrd et al.

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